Initial commit

invoices/admin.py

@@ -0,0 +1,275 @@
+from django.contrib import admin
+from .models import (
+    Customer,
+    CustomerContact,
+    CustomerLocation,
+    Item,
+    Invoice, 
+    InvoiceItem,
+    Unit,
+    Reminder
+)
+
+@admin.register(Unit)
+class UnitAdmin(admin.ModelAdmin):
+    list_display = (
+        "name",
+        "short_name",
+    )
+
+    search_fields = (
+        "name",
+        "short_name",
+    )
+
+class CustomerContactInline(admin.TabularInline):
+    model = CustomerContact
+    extra = 0
+
+
+class CustomerLocationInline(admin.TabularInline):
+    model = CustomerLocation
+    extra = 0
+
+
+@admin.register(Customer)
+class CustomerAdmin(admin.ModelAdmin):
+    list_display = (
+        "customer_number",
+        "company_name",
+        "customer_type",
+        "phone",
+        "email",
+    )
+
+    search_fields = (
+        "customer_number",
+        "company_name",
+        "email",
+        "phone",
+        "tax_number",
+        "vat_number",
+    )
+
+    list_filter = (
+        "customer_type",
+    )
+
+    inlines = (
+        CustomerContactInline,
+        CustomerLocationInline,
+    )
+
+
+@admin.register(CustomerContact)
+class CustomerContactAdmin(admin.ModelAdmin):
+    list_display = (
+        "first_name",
+        "last_name",
+        "customer",
+        "phone",
+        "email",
+    )
+
+    search_fields = (
+        "first_name",
+        "last_name",
+        "email",
+        "phone",
+        "customer__company_name",
+    )
+
+
+@admin.register(CustomerLocation)
+class CustomerLocationAdmin(admin.ModelAdmin):
+    list_display = (
+        "name",
+        "customer",
+        "city",
+        "country",
+    )
+
+    search_fields = (
+        "name",
+        "city",
+        "street",
+        "customer__company_name",
+    )
+
+
+@admin.register(Item)
+class ItemAdmin(admin.ModelAdmin):
+    list_display = (
+        "description",
+        "item_type",
+        "unit",
+        "price_net",
+    )
+
+    search_fields = (
+        "description",
+    )
+
+    list_filter = (
+        "item_type",
+        "unit",
+    )
+
+
+
+
+
+
+class InvoiceItemInline(admin.TabularInline):
+    model = InvoiceItem
+    extra = 0
+
+
+@admin.register(Invoice)
+class InvoiceAdmin(admin.ModelAdmin):
+
+    list_display = (
+        "invoice_number",
+        "customer",
+        "project",
+        "status",
+        "issue_date",
+        "due_date",
+    )
+
+    list_filter = (
+        "status",
+        "issue_date",
+        "customer",
+    )
+
+    search_fields = (
+        "invoice_number",
+        "customer__company_name",
+    )
+
+    autocomplete_fields = (
+        "customer",
+        "project",
+    )
+
+
+@admin.register(InvoiceItem)
+class InvoiceItemAdmin(admin.ModelAdmin):
+
+    list_display = (
+        "description",
+        "invoice",
+        "quantity",
+        "unit_price_net",
+    )
+
+    search_fields = (
+        "description",
+        "invoice__invoice_number",
+    )
+
+    autocomplete_fields = (
+        "invoice",
+        "item",
+        "time_entry",
+        "expense",
+    )
+
+
+
+
+
+
+
+
+
+
+
+from .models import (
+    Offer,
+    OfferItem,
+)
+
+
+class OfferItemInline(admin.TabularInline):
+    model = OfferItem
+    extra = 0
+
+
+@admin.register(Offer)
+class OfferAdmin(admin.ModelAdmin):
+
+    list_display = (
+        "offer_number",
+        "customer",
+        "status",
+        "issue_date",
+        "due_date",
+        "created_at",
+    )
+
+    list_filter = (
+        "status",
+        "issue_date",
+    )
+
+    search_fields = (
+        "offer_number",
+        "contact_name",
+        "customer__company_name",
+    )
+
+    readonly_fields = (
+        "created_at",
+        "pdf_generated_at",
+    )
+
+    inlines = [
+        OfferItemInline,
+    ]
+
+
+@admin.register(OfferItem)
+class OfferItemAdmin(admin.ModelAdmin):
+
+    list_display = (
+        "offer",
+        "description",
+        "quantity",
+        "unit",
+        "unit_price_net",
+        "unit_tax_rate",
+        "created_at",
+    )
+
+    search_fields = (
+        "description",
+        "offer__offer_number",
+    )
+
+    autocomplete_fields = (
+        "offer",
+        "item",
+    )
+
+
+@admin.register(Reminder)
+class ReminderAdmin(admin.ModelAdmin):
+    list_filter = (
+        "level",
+        "issue_date",
+        "due_date",
+        "pdf_generated_at",
+    )
+
+    search_fields = (
+        "reminder_number",
+    )
+
+    readonly_fields = (
+        "created_at",
+        "pdf_generated_at",
+    )
+
+    ordering = ("-created_at",)

invoices/apps.py

@@ -0,0 +1,5 @@
+from django.apps import AppConfig
+
+
+class InvoicesConfig(AppConfig):
+    name = 'invoices'

invoices/forms.py

@@ -0,0 +1,641 @@
+from django import forms
+from core.forms.base import BaseForm
+from .models import Customer, Item, Invoice, InvoiceItem, CustomerContact, CustomerLocation, Offer, OfferItem, Reminder
+from projects.models import Project
+from time_tracking.models import TimeEntry
+from finance.models import Expense
+from django.utils import timezone
+from django.db.models import Q, Max
+
+class CustomerForm(BaseForm):
+    class Meta:
+        model = Customer
+        fields = [
+            "customer_number",
+            "customer_type",
+            "company_name",
+            "tax_number",
+            "vat_number",
+            "phone",
+            "email",
+        ]
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.apply_style()
+
+
+
+class ItemForm(BaseForm):
+    class Meta:
+        model = Item
+        fields = [
+            "item_type",
+            "description",
+            "unit",
+            "price_net",
+            "tax_rate",
+        ]
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.apply_style()
+
+
+
+
+
+class CustomerInvoiceForm(BaseForm):
+
+    contact = forms.ModelChoiceField(
+        queryset=CustomerContact.objects.none(),
+        label="Ansprechpartner",
+        required=True
+    )
+
+    location = forms.ModelChoiceField(
+        queryset=CustomerLocation.objects.none(),
+        label="Standort",
+        required=True
+    )
+
+    class Meta:
+        model = Invoice
+        fields = [
+            "customer",
+            "contact",
+            "location",
+            "issue_date",
+            "due_date",
+            "note",
+        ]
+
+        widgets = {
+            "issue_date": forms.DateInput(attrs={"type": "date"}),
+            "due_date": forms.DateInput(attrs={"type": "date"}),
+        }
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.apply_style()
+
+        customer_id = (
+            self.data.get("customer")
+            or getattr(self.instance, "customer_id", None)
+        )
+
+        if customer_id:
+            self.fields["contact"].queryset = CustomerContact.objects.filter(customer_id=customer_id)
+            self.fields["location"].queryset = CustomerLocation.objects.filter(customer_id=customer_id)
+        else:
+            self.fields["contact"].queryset = CustomerContact.objects.none()
+            self.fields["location"].queryset = CustomerLocation.objects.none()
+
+
+
+
+
+class ProjectInvoiceForm(BaseForm):
+
+    contact = forms.ModelChoiceField(
+        queryset=CustomerContact.objects.none(),
+        required=False,
+        label="Ansprechpartner",
+        widget=forms.Select(attrs={
+            "class": "customer-field"
+        })
+    )
+
+    location = forms.ModelChoiceField(
+        queryset=CustomerLocation.objects.none(),
+        required=False,
+        label="Standort",
+        widget=forms.Select(attrs={
+            "class": "customer-field"
+        })
+    )
+
+
+    contact_name_manual = forms.CharField(
+        required=False,
+        label="Ansprechpartner",
+        widget=forms.TextInput(attrs={
+            "class": "manual-field"
+        })
+    )
+
+    contact_email_manual = forms.EmailField(
+        required=False,
+        label="E-Mail",
+        widget=forms.EmailInput(attrs={
+            "class": "manual-field"
+        })
+    )
+
+    contact_phone_manual = forms.CharField(
+        required=False,
+        label="Telefon",
+        widget=forms.TextInput(attrs={
+            "class": "manual-field"
+        })
+    )
+
+
+    location_name_manual = forms.CharField(
+        required=False,
+        label="Standort",
+        widget=forms.TextInput(attrs={
+            "class": "manual-field"
+        })
+    )
+
+    location_street_manual = forms.CharField(
+        required=False,
+        label="Straße",
+        widget=forms.TextInput(attrs={
+            "class": "manual-field"
+        })
+    )
+
+    location_zip_manual = forms.CharField(
+        required=False,
+        label="PLZ",
+        widget=forms.TextInput(attrs={
+            "class": "manual-field"
+        })
+    )
+
+    location_city_manual = forms.CharField(
+        required=False,
+        label="Ort",
+        widget=forms.TextInput(attrs={
+            "class": "manual-field"
+        })
+    )
+
+    location_country_manual = forms.CharField(
+        required=False,
+        label="Land",
+        widget=forms.TextInput(attrs={
+            "class": "manual-field"
+        })
+    )
+
+
+    class Meta:
+
+        model = Invoice
+
+        fields = [
+            "project",
+
+            "contact",
+            "location",
+
+            "contact_name_manual",
+            "contact_email_manual",
+            "contact_phone_manual",
+
+            "location_name_manual",
+            "location_street_manual",
+            "location_zip_manual",
+            "location_city_manual",
+            "location_country_manual",
+
+            "issue_date",
+            "due_date",
+            "note",
+        ]
+
+
+        widgets = {
+
+            "issue_date": forms.DateInput(
+                attrs={
+                    "type": "date"
+                }
+            ),
+
+            "due_date": forms.DateInput(
+                attrs={
+                    "type": "date"
+                }
+            ),
+        }
+
+    
+
+
+
+    def __init__(self, *args, **kwargs):
+
+        super().__init__(*args, **kwargs)
+
+        self.apply_style()
+
+
+        project_id = self.data.get("project") or getattr(
+            self.instance,
+            "project_id",
+            None
+        )
+
+
+        if project_id:
+
+            project = Project.objects.filter(
+                id=project_id
+            ).first()
+
+
+            if project and project.customer:
+
+                self.fields["contact"].queryset = CustomerContact.objects.filter(
+                    customer=project.customer
+                )
+
+                self.fields["location"].queryset = CustomerLocation.objects.filter(
+                    customer=project.customer
+                )
+
+
+
+
+
+class InvoiceItemForm(BaseForm):
+
+    class Meta:
+        model = InvoiceItem
+
+        fields = [
+            "source_type",
+            "item",
+            "time_entry",
+            "expense",
+            "description",
+            "quantity",
+            "unit",
+            "unit_price_net",
+            "unit_tax_rate",
+            'service_period_from',
+            'service_period_to',
+        ]
+        widgets = {
+
+            "quantity": forms.NumberInput(attrs={
+                "step": "1.00"
+            }),
+
+            "unit_price_net": forms.NumberInput(attrs={
+                "step": "1.00"
+            }),
+
+            "unit_tax_rate": forms.NumberInput(attrs={
+                "step": "1.00"
+            }),
+                        "issue_date": forms.DateInput(
+                attrs={
+                    "type": "date"
+                }
+            ),
+
+            "service_period_from": forms.DateInput(
+                attrs={
+                    "type": "date"
+                }
+            ),
+
+            "service_period_to": forms.DateInput(
+                attrs={
+                    "type": "date"
+                }
+            ),
+            
+        }
+
+
+    def __init__(
+        self,
+        *args,
+        invoice=None,
+        **kwargs
+    ):
+
+        super().__init__(*args, **kwargs)
+        self.apply_style()
+        self.invoice = invoice
+        self.fields["item"].queryset = Item.objects.all()
+        self.fields["time_entry"].queryset = TimeEntry.objects.none()
+        self.fields["expense"].queryset = Expense.objects.none()
+
+
+        if invoice and invoice.project:
+
+
+            self.fields["source_type"].choices = [
+                ("item", "Artikel"),
+                ("time", "Zeiterfassung"),
+                ("expense", "Ausgabe"),
+            ]
+
+
+            self.fields["time_entry"].queryset = TimeEntry.objects.filter(
+                project=invoice.project,end__isnull=False
+            )
+
+
+            self.fields["expense"].queryset = Expense.objects.filter(
+                project=invoice.project
+            )
+
+        else:
+            self.fields["source_type"].choices = [
+                ("item", "Artikel"),
+            ]
+
+        self.fields["item"].widget.attrs["class"] += " source-item"
+        self.fields["time_entry"].widget.attrs["class"] += " source-time"
+        self.fields["expense"].widget.attrs["class"] += " source-expense"
+
+    def save(self, commit=True):
+
+        obj = super().save(commit=False)
+
+
+        source = self.cleaned_data.get(
+            "source_type"
+        )
+
+
+        # -------------------------
+        # ARTIKEL
+        # -------------------------
+
+        if source == "item":
+
+            item = self.cleaned_data["item"]
+
+            obj.item = item
+            obj.time_entry = None
+            obj.expense = None
+
+            obj.description = self.cleaned_data["description"]
+            obj.unit = self.cleaned_data["unit"]
+            obj.unit_price_net = self.cleaned_data["unit_price_net"]
+            obj.unit_tax_rate = self.cleaned_data["unit_tax_rate"]
+
+
+
+        # -------------------------
+        # ZEITERFASSUNG
+        # -------------------------
+
+        elif source == "time":
+
+            entry = self.cleaned_data["time_entry"]
+
+            obj.item = None
+            obj.time_entry = entry
+            obj.expense = None
+
+
+            obj.description = self.cleaned_data["description"]
+            obj.unit = self.cleaned_data["unit"]
+            obj.unit_price_net = self.cleaned_data["unit_price_net"]
+            obj.unit_tax_rate = self.cleaned_data["unit_tax_rate"]
+
+
+
+        # -------------------------
+        # AUSGABE
+        # -------------------------
+
+        elif source == "expense":
+
+            expense = self.cleaned_data["expense"]
+
+            obj.item = None
+            obj.time_entry = None
+            obj.expense = expense
+
+
+            obj.description = self.cleaned_data["description"]
+            obj.unit = self.cleaned_data["unit"]
+            obj.unit_price_net = self.cleaned_data["unit_price_net"]
+            obj.unit_tax_rate = self.cleaned_data["unit_tax_rate"]
+
+
+
+        if commit:
+            obj.save()
+
+
+        return obj
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+class OfferForm(BaseForm):
+
+    contact = forms.ModelChoiceField(
+        queryset=CustomerContact.objects.none(),
+        label="Ansprechpartner",
+        required=True
+    )
+
+    location = forms.ModelChoiceField(
+        queryset=CustomerLocation.objects.none(),
+        label="Standort",
+        required=True
+    )
+
+    class Meta:
+        model = Offer
+        fields = [
+            "customer",
+            "contact",
+            "location",
+            "issue_date",
+            "due_date",
+            "note",
+        ]
+
+        widgets = {
+            "issue_date": forms.DateInput(attrs={"type": "date"}),
+            "due_date": forms.DateInput(attrs={"type": "date"}),
+        }
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.apply_style()
+
+        customer_id = (
+            self.data.get("customer")
+            or getattr(self.instance, "customer_id", None)
+        )
+
+        if customer_id:
+            self.fields["contact"].queryset = CustomerContact.objects.filter(customer_id=customer_id)
+            self.fields["location"].queryset = CustomerLocation.objects.filter(customer_id=customer_id)
+        else:
+            self.fields["contact"].queryset = CustomerContact.objects.none()
+            self.fields["location"].queryset = CustomerLocation.objects.none()
+
+
+
+
+
+class OfferItemForm(BaseForm):
+
+    class Meta:
+        model = OfferItem
+
+        fields = [
+            "item",
+            "description",
+            "quantity",
+            "unit",
+            "unit_price_net",
+            "unit_tax_rate",
+        ]
+
+        widgets = {
+            "quantity": forms.NumberInput(
+                attrs={"step": "1.00"}
+            ),
+            "unit_price_net": forms.NumberInput(
+                attrs={"step": "1.00"}
+            ),
+            "unit_tax_rate": forms.NumberInput(
+                attrs={"step": "1.00"}
+            ),
+        }
+
+    def __init__(
+        self,
+        *args,
+        offer=None,
+        **kwargs
+    ):
+
+        super().__init__(*args, **kwargs)
+
+        self.apply_style()
+
+        self.offer = offer
+
+        self.fields["item"].queryset = (
+            Item.objects.all()
+        )
+
+    def save(self, commit=True):
+
+        obj = super().save(commit=False)
+
+        item = self.cleaned_data.get("item")
+
+        if item:
+            obj.item = item
+
+        if commit:
+            obj.save()
+
+        return obj
+
+
+
+
+
+
+
+
+class ReminderForm(BaseForm):
+
+    class Meta:
+        model = Reminder
+        fields = [
+            "invoice",
+            "issue_date",
+            "due_date",
+            "fee",
+            "note",
+        ]
+
+        widgets = {
+            "issue_date": forms.DateInput(attrs={"type": "date"}),
+            "due_date": forms.DateInput(attrs={"type": "date"}),
+        }
+
+
+    def __init__(self, *args, **kwargs):
+
+        super().__init__(*args, **kwargs)
+
+
+        possible_invoices = []
+
+
+        invoices = Invoice.objects.filter(
+            status=Invoice.Status.OVERDUE,
+            due_date__lt=timezone.now().date(),
+        ).prefetch_related(
+            "reminders"
+        )
+
+
+        for invoice in invoices:
+
+            reminders = invoice.reminders.exclude(
+                status=Reminder.Status.CANCELED
+            ).order_by("-level")
+
+
+            # Keine Mahnung vorhanden
+            if not reminders.exists():
+                possible_invoices.append(invoice)
+                continue
+
+
+            last_reminder = reminders.first()
+
+
+            # Nur nach expired möglich
+            if last_reminder.status != Reminder.Status.EXPIRED:
+                continue
+
+
+            # Maximal 3 Mahnungen
+            if last_reminder.level >= 3:
+                continue
+
+
+            possible_invoices.append(invoice)
+
+
+        self.fields["invoice"].queryset = Invoice.objects.filter(
+            id__in=[i.id for i in possible_invoices]
+        ).order_by("due_date")
+
+
+        self.apply_style()

invoices/migrations/0001_initial.py

@@ -0,0 +1,145 @@
+# Generated by Django 6.0.6 on 2026-06-23 22:12
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Customer',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('customer_number', models.CharField(max_length=50, unique=True, verbose_name='Kunden-ID')),
+                ('customer_type', models.CharField(choices=[('private', 'Privat'), ('company', 'Unternehmen')], default='company', max_length=20, verbose_name='Kundentyp')),
+                ('company_name', models.CharField(max_length=255, verbose_name='Firmenname / Kundenname')),
+                ('tax_number', models.CharField(blank=True, max_length=100, verbose_name='Steuernummer')),
+                ('vat_number', models.CharField(blank=True, max_length=100, verbose_name='UST-IdNr')),
+                ('phone', models.CharField(blank=True, max_length=100, verbose_name='Telefon')),
+                ('email', models.EmailField(blank=True, max_length=254, verbose_name='E-Mail')),
+                ('active', models.BooleanField(default=True, verbose_name='Status')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+            ],
+            options={
+                'verbose_name': 'Kunde',
+                'verbose_name_plural': 'Kunden',
+                'ordering': ['company_name'],
+            },
+        ),
+        migrations.CreateModel(
+            name='InvoiceItem',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('source_type', models.CharField(choices=[('item', 'Artikel'), ('time', 'Zeiterfassung'), ('expense', 'Ausgabe')], default='item', max_length=20, verbose_name='Quelle')),
+                ('description', models.CharField(max_length=255, verbose_name='Beschreibung')),
+                ('quantity', models.DecimalField(decimal_places=2, default=1, max_digits=10, verbose_name='Menge')),
+                ('unit', models.CharField(max_length=50, verbose_name='Einheit')),
+                ('unit_price_net', models.DecimalField(decimal_places=2, max_digits=10, verbose_name='Einzelpreis Netto')),
+                ('unit_tax_rate', models.DecimalField(decimal_places=2, default=19.0, max_digits=5, verbose_name='MwSt. Satz (%)')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+            ],
+            options={
+                'verbose_name': 'Rechnungsposition',
+                'verbose_name_plural': 'Rechnungspositionen',
+            },
+        ),
+        migrations.CreateModel(
+            name='Item',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('item_type', models.CharField(choices=[('service', 'Dienstleistung'), ('product', 'Ware')], default='product', max_length=20, verbose_name='Art')),
+                ('description', models.CharField(max_length=255, verbose_name='Beschreibung')),
+                ('price_net', models.DecimalField(decimal_places=2, max_digits=10, verbose_name='Preis Netto')),
+                ('tax_rate', models.DecimalField(decimal_places=2, default=19.0, max_digits=5, verbose_name='MwSt. Satz (%)')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+            ],
+            options={
+                'verbose_name': 'Posten',
+                'verbose_name_plural': 'Posten',
+                'ordering': ['description'],
+            },
+        ),
+        migrations.CreateModel(
+            name='Unit',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=50, verbose_name='Bezeichnung')),
+                ('short_name', models.CharField(max_length=20, verbose_name='Kürzel')),
+            ],
+            options={
+                'verbose_name': 'Einheit',
+                'verbose_name_plural': 'Einheiten',
+                'ordering': ['name'],
+            },
+        ),
+        migrations.CreateModel(
+            name='CustomerContact',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('first_name', models.CharField(max_length=150, verbose_name='Vorname')),
+                ('last_name', models.CharField(max_length=150, verbose_name='Nachname')),
+                ('email', models.EmailField(blank=True, max_length=254, verbose_name='E-Mail')),
+                ('phone', models.CharField(blank=True, max_length=100, verbose_name='Telefon')),
+                ('customer', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='contacts', to='invoices.customer', verbose_name='Kunde')),
+            ],
+            options={
+                'verbose_name': 'Ansprechpartner',
+                'verbose_name_plural': 'Ansprechpartner',
+                'ordering': ['last_name', 'first_name'],
+            },
+        ),
+        migrations.CreateModel(
+            name='CustomerLocation',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=255, verbose_name='Bezeichnung')),
+                ('zip_code', models.CharField(blank=True, max_length=20, verbose_name='PLZ')),
+                ('city', models.CharField(blank=True, max_length=255, verbose_name='Ort')),
+                ('street', models.CharField(blank=True, max_length=255, verbose_name='Adresse')),
+                ('country', models.CharField(blank=True, max_length=100, verbose_name='Land')),
+                ('customer', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='locations', to='invoices.customer', verbose_name='Kunde')),
+            ],
+            options={
+                'verbose_name': 'Standort',
+                'verbose_name_plural': 'Standorte',
+                'ordering': ['name'],
+            },
+        ),
+        migrations.CreateModel(
+            name='Invoice',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('invoice_number', models.CharField(max_length=50, unique=True, verbose_name='Rechnungsnummer')),
+                ('status', models.CharField(choices=[('draft', 'Entwurf'), ('sent', 'Versendet'), ('paid', 'Bezahlt'), ('canceled', 'Storniert')], default='draft', max_length=20, verbose_name='Status')),
+                ('issue_date', models.DateField(verbose_name='Rechnungsdatum')),
+                ('due_date', models.DateField(blank=True, null=True, verbose_name='Fälligkeitsdatum')),
+                ('note', models.TextField(blank=True, verbose_name='Notiz')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('pdf_file', models.FileField(blank=True, null=True, upload_to='invoice_pdfs/', verbose_name='PDF')),
+                ('pdf_generated_at', models.DateTimeField(blank=True, null=True, verbose_name='PDF erstellt am')),
+                ('tax_number', models.CharField(blank=True, max_length=100, verbose_name='Steuernummer Kunde')),
+                ('vat_number', models.CharField(blank=True, max_length=100, verbose_name='USt-IdNr Kunde')),
+                ('contact_name', models.CharField(max_length=255, verbose_name='Ansprechpartner')),
+                ('contact_email', models.EmailField(blank=True, max_length=254, verbose_name='E-Mail Ansprechpartner')),
+                ('contact_phone', models.CharField(blank=True, max_length=100, verbose_name='Telefon Ansprechpartner')),
+                ('location_name', models.CharField(max_length=255, verbose_name='Standort')),
+                ('location_street', models.CharField(blank=True, max_length=255, verbose_name='Straße')),
+                ('location_city', models.CharField(blank=True, max_length=255, verbose_name='Ort')),
+                ('location_zip', models.CharField(blank=True, max_length=20, verbose_name='PLZ')),
+                ('location_country', models.CharField(blank=True, max_length=100, verbose_name='Land')),
+                ('customer', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.PROTECT, related_name='invoices', to='invoices.customer', verbose_name='Kunde')),
+            ],
+            options={
+                'verbose_name': 'Rechnung',
+                'verbose_name_plural': 'Rechnungen',
+                'ordering': ['-issue_date'],
+            },
+        ),
+    ]

invoices/migrations/0002_initial.py

@@ -0,0 +1,49 @@
+# Generated by Django 6.0.6 on 2026-06-23 22:12
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('finance', '0002_initial'),
+        ('invoices', '0001_initial'),
+        ('projects', '0001_initial'),
+        ('time_tracking', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='invoice',
+            name='project',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='invoices', to='projects.project', verbose_name='Projekt'),
+        ),
+        migrations.AddField(
+            model_name='invoiceitem',
+            name='expense',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='finance.expense', verbose_name='Ausgabe'),
+        ),
+        migrations.AddField(
+            model_name='invoiceitem',
+            name='invoice',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='items', to='invoices.invoice', verbose_name='Rechnung'),
+        ),
+        migrations.AddField(
+            model_name='invoiceitem',
+            name='time_entry',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='time_tracking.timeentry', verbose_name='Zeiterfassung'),
+        ),
+        migrations.AddField(
+            model_name='invoiceitem',
+            name='item',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='invoices.item', verbose_name='Artikel'),
+        ),
+        migrations.AddField(
+            model_name='item',
+            name='unit',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='item_items', to='invoices.unit', verbose_name='Einheit'),
+        ),
+    ]

invoices/migrations/0003_invoice_pdf_canceled_file_and_more.py

@@ -0,0 +1,23 @@
+# Generated by Django 6.0.6 on 2026-06-24 08:38
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0002_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='invoice',
+            name='pdf_canceled_file',
+            field=models.FileField(blank=True, null=True, upload_to='invoice_pdfs/', verbose_name='Stornorechnung'),
+        ),
+        migrations.AddField(
+            model_name='invoice',
+            name='pdf_canceled_generated_at',
+            field=models.DateTimeField(blank=True, null=True, verbose_name='Stornorechnung erstellt am'),
+        ),
+    ]

invoices/migrations/0004_documentnumbersettings.py

@@ -0,0 +1,28 @@
+# Generated by Django 6.0.6 on 2026-06-24 09:53
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0003_delete_documentnumbersettings'),
+        ('invoices', '0003_invoice_pdf_canceled_file_and_more'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='DocumentNumberSettings',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('invoice_prefix', models.CharField(default='RE', max_length=20)),
+                ('invoice_next_number', models.PositiveIntegerField(default=1)),
+                ('cancel_prefix', models.CharField(default='ST', max_length=20)),
+                ('cancel_next_number', models.PositiveIntegerField(default=1)),
+                ('offer_prefix', models.CharField(default='ANG', max_length=20)),
+                ('offer_next_number', models.PositiveIntegerField(default=1)),
+                ('company', models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, related_name='number_settings', to='core.companysetting')),
+            ],
+        ),
+    ]

invoices/migrations/0005_remove_documentnumbersettings_cancel_prefix_and_more.py

@@ -0,0 +1,40 @@
+# Generated by Django 6.0.6 on 2026-06-24 09:56
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0004_documentnumbersettings'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='documentnumbersettings',
+            name='cancel_prefix',
+        ),
+        migrations.RemoveField(
+            model_name='documentnumbersettings',
+            name='invoice_prefix',
+        ),
+        migrations.RemoveField(
+            model_name='documentnumbersettings',
+            name='offer_prefix',
+        ),
+        migrations.AddField(
+            model_name='documentnumbersettings',
+            name='cancel_format',
+            field=models.CharField(default='ST-{year}-{number}', max_length=100),
+        ),
+        migrations.AddField(
+            model_name='documentnumbersettings',
+            name='invoice_format',
+            field=models.CharField(default='RE-{year}-{number}', max_length=100),
+        ),
+        migrations.AddField(
+            model_name='documentnumbersettings',
+            name='offer_format',
+            field=models.CharField(default='ANG-{year}-{number}', max_length=100),
+        ),
+    ]

invoices/migrations/0006_alter_documentnumbersettings_options_and_more.py

@@ -0,0 +1,54 @@
+# Generated by Django 6.0.6 on 2026-06-24 09:59
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0003_delete_documentnumbersettings'),
+        ('invoices', '0005_remove_documentnumbersettings_cancel_prefix_and_more'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='documentnumbersettings',
+            options={'verbose_name': 'Dokumentnummer', 'verbose_name_plural': 'Dokumentnummern'},
+        ),
+        migrations.AlterField(
+            model_name='documentnumbersettings',
+            name='cancel_format',
+            field=models.CharField(default='ST-{year}-{number}', max_length=100, verbose_name='Stornoformat'),
+        ),
+        migrations.AlterField(
+            model_name='documentnumbersettings',
+            name='cancel_next_number',
+            field=models.PositiveIntegerField(default=1, verbose_name='Storno ID (nächste)'),
+        ),
+        migrations.AlterField(
+            model_name='documentnumbersettings',
+            name='company',
+            field=models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, related_name='number_settings', to='core.companysetting', verbose_name='Unternehmen'),
+        ),
+        migrations.AlterField(
+            model_name='documentnumbersettings',
+            name='invoice_format',
+            field=models.CharField(default='RE-{year}-{number}', max_length=100, verbose_name='Rechnungsformat'),
+        ),
+        migrations.AlterField(
+            model_name='documentnumbersettings',
+            name='invoice_next_number',
+            field=models.PositiveIntegerField(default=1, verbose_name='Rechnungs ID (nächste)'),
+        ),
+        migrations.AlterField(
+            model_name='documentnumbersettings',
+            name='offer_format',
+            field=models.CharField(default='ANG-{year}-{number}', max_length=100, verbose_name='Angebotsformat'),
+        ),
+        migrations.AlterField(
+            model_name='documentnumbersettings',
+            name='offer_next_number',
+            field=models.PositiveIntegerField(default=1, verbose_name='Angebots ID (nächste)'),
+        ),
+    ]

invoices/migrations/0007_invoice_cancel_number.py

@@ -0,0 +1,18 @@
+# Generated by Django 6.0.6 on 2026-06-24 11:30
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0006_alter_documentnumbersettings_options_and_more'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='invoice',
+            name='cancel_number',
+            field=models.CharField(blank=True, max_length=50, null=True, unique=True, verbose_name='Stornorechnungsnummer'),
+        ),
+    ]

invoices/migrations/0008_reminder.py

@@ -0,0 +1,36 @@
+# Generated by Django 6.0.6 on 2026-06-24 18:29
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0007_invoice_cancel_number'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Reminder',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('reminder_number', models.CharField(max_length=50, unique=True, verbose_name='Mahnungsnummer')),
+                ('level', models.PositiveSmallIntegerField(default=1, help_text='1 = Erste Mahnung, 2 = Zweite Mahnung, 3 = Letzte Mahnung', verbose_name='Mahnstufe')),
+                ('issue_date', models.DateField(verbose_name='Mahndatum')),
+                ('due_date', models.DateField(blank=True, null=True, verbose_name='Neue Zahlungsfrist')),
+                ('fee', models.DecimalField(decimal_places=2, default=0, max_digits=10, verbose_name='Mahngebühr')),
+                ('interest', models.DecimalField(decimal_places=2, default=0, max_digits=10, verbose_name='Verzugszinsen')),
+                ('note', models.TextField(blank=True, verbose_name='Hinweis')),
+                ('pdf_file', models.FileField(blank=True, null=True, upload_to='reminder_pdfs/', verbose_name='PDF')),
+                ('pdf_generated_at', models.DateTimeField(blank=True, null=True, verbose_name='PDF erstellt am')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('invoice', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='reminders', to='invoices.invoice', verbose_name='Rechnung')),
+            ],
+            options={
+                'verbose_name': 'Mahnung',
+                'verbose_name_plural': 'Mahnungen',
+                'ordering': ['-created_at'],
+            },
+        ),
+    ]

invoices/migrations/0009_offer_offeritem.py

@@ -0,0 +1,64 @@
+# Generated by Django 6.0.6 on 2026-06-24 19:17
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0008_reminder'),
+        ('projects', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Offer',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('offer_number', models.CharField(max_length=50, unique=True, verbose_name='Angebotsnummer')),
+                ('status', models.CharField(choices=[('draft', 'Entwurf'), ('sent', 'Versendet'), ('accepted', 'Akzeptiert'), ('rejected', 'Abgelehnt'), ('expired', 'Ausgelaufen')], default='draft', max_length=20, verbose_name='Status')),
+                ('issue_date', models.DateField(verbose_name='Angebotsdatum')),
+                ('due_date', models.DateField(blank=True, null=True, verbose_name='Gültig bis')),
+                ('note', models.TextField(blank=True, verbose_name='Notiz')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('pdf_file', models.FileField(blank=True, null=True, upload_to='offer_pdfs/', verbose_name='PDF')),
+                ('pdf_generated_at', models.DateTimeField(blank=True, null=True, verbose_name='PDF erstellt am')),
+                ('tax_number', models.CharField(blank=True, max_length=100, verbose_name='Steuernummer Kunde')),
+                ('vat_number', models.CharField(blank=True, max_length=100, verbose_name='USt-IdNr Kunde')),
+                ('contact_name', models.CharField(max_length=255, verbose_name='Ansprechpartner')),
+                ('contact_email', models.EmailField(blank=True, max_length=254, verbose_name='E-Mail Ansprechpartner')),
+                ('contact_phone', models.CharField(blank=True, max_length=100, verbose_name='Telefon Ansprechpartner')),
+                ('location_name', models.CharField(max_length=255, verbose_name='Standort')),
+                ('location_street', models.CharField(blank=True, max_length=255, verbose_name='Straße')),
+                ('location_city', models.CharField(blank=True, max_length=255, verbose_name='Ort')),
+                ('location_zip', models.CharField(blank=True, max_length=20, verbose_name='PLZ')),
+                ('location_country', models.CharField(blank=True, max_length=100, verbose_name='Land')),
+                ('customer', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.PROTECT, related_name='offers', to='invoices.customer', verbose_name='Kunde')),
+                ('project', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='offers', to='projects.project', verbose_name='Projekt')),
+            ],
+            options={
+                'verbose_name': 'Angebot',
+                'verbose_name_plural': 'Angebote',
+                'ordering': ['-issue_date'],
+            },
+        ),
+        migrations.CreateModel(
+            name='OfferItem',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('description', models.CharField(max_length=255, verbose_name='Beschreibung')),
+                ('quantity', models.DecimalField(decimal_places=2, default=1, max_digits=10, verbose_name='Menge')),
+                ('unit', models.CharField(max_length=50, verbose_name='Einheit')),
+                ('unit_price_net', models.DecimalField(decimal_places=2, max_digits=10, verbose_name='Einzelpreis Netto')),
+                ('unit_tax_rate', models.DecimalField(decimal_places=2, default=19.0, max_digits=5, verbose_name='MwSt. Satz (%)')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('item', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='invoices.item', verbose_name='Artikel')),
+                ('offer', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='items', to='invoices.offer', verbose_name='Angebot')),
+            ],
+            options={
+                'verbose_name': 'Angebotsposition',
+                'verbose_name_plural': 'Angebotspositionen',
+            },
+        ),
+    ]

invoices/migrations/0010_item_service_period_from_item_service_period_to.py

@@ -0,0 +1,23 @@
+# Generated by Django 6.0.6 on 2026-06-25 15:17
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0009_offer_offeritem'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='item',
+            name='service_period_from',
+            field=models.DateField(blank=True, null=True, verbose_name='Leistungszeitraum von'),
+        ),
+        migrations.AddField(
+            model_name='item',
+            name='service_period_to',
+            field=models.DateField(blank=True, null=True, verbose_name='Leistungszeitraum bis'),
+        ),
+    ]

invoices/migrations/0011_remove_item_service_period_from_and_more.py

@@ -0,0 +1,31 @@
+# Generated by Django 6.0.6 on 2026-06-25 15:19
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0010_item_service_period_from_item_service_period_to'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='item',
+            name='service_period_from',
+        ),
+        migrations.RemoveField(
+            model_name='item',
+            name='service_period_to',
+        ),
+        migrations.AddField(
+            model_name='invoiceitem',
+            name='service_period_from',
+            field=models.DateField(blank=True, null=True, verbose_name='Leistungszeitraum von'),
+        ),
+        migrations.AddField(
+            model_name='invoiceitem',
+            name='service_period_to',
+            field=models.DateField(blank=True, null=True, verbose_name='Leistungszeitraum bis'),
+        ),
+    ]

invoices/migrations/0012_remove_offer_project.py

@@ -0,0 +1,17 @@
+# Generated by Django 6.0.6 on 2026-06-25 16:13
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0011_remove_item_service_period_from_and_more'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='offer',
+            name='project',
+        ),
+    ]

invoices/migrations/0013_reminder_status.py

@@ -0,0 +1,18 @@
+# Generated by Django 6.0.6 on 2026-06-27 05:50
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0012_remove_offer_project'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='reminder',
+            name='status',
+            field=models.CharField(choices=[('draft', 'Entwurf'), ('sent', 'Versendet'), ('paid', 'Bezahlt'), ('partial', 'Teilweise bezahlt'), ('cancelled', 'Storniert'), ('expired', 'Frist abgelaufen')], default='draft', max_length=20, verbose_name='Status'),
+        ),
+    ]

invoices/migrations/0014_alter_invoice_status.py

@@ -0,0 +1,18 @@
+# Generated by Django 6.0.6 on 2026-06-27 06:00
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0013_reminder_status'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='invoice',
+            name='status',
+            field=models.CharField(choices=[('draft', 'Entwurf'), ('sent', 'Versendet'), ('paid', 'Bezahlt'), ('overdue', 'Überfällig'), ('canceled', 'Storniert')], default='draft', max_length=20, verbose_name='Status'),
+        ),
+    ]

invoices/migrations/0015_alter_documentnumbersettings_offer_format_and_more.py

@@ -0,0 +1,23 @@
+# Generated by Django 6.0.6 on 2026-06-27 06:14
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0014_alter_invoice_status'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='documentnumbersettings',
+            name='offer_format',
+            field=models.CharField(default='M-{year}-{number}', max_length=100, verbose_name='Mahnungsformat'),
+        ),
+        migrations.AlterField(
+            model_name='documentnumbersettings',
+            name='offer_next_number',
+            field=models.PositiveIntegerField(default=1, verbose_name='Mahnungs ID (nächste)'),
+        ),
+    ]

invoices/migrations/0016_documentnumbersettings_reminder_format_and_more.py

@@ -0,0 +1,33 @@
+# Generated by Django 6.0.6 on 2026-06-27 06:21
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0015_alter_documentnumbersettings_offer_format_and_more'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='documentnumbersettings',
+            name='reminder_format',
+            field=models.CharField(default='M-{year}-{number}', max_length=100, verbose_name='Mahnungsformat'),
+        ),
+        migrations.AddField(
+            model_name='documentnumbersettings',
+            name='reminder_next_number',
+            field=models.PositiveIntegerField(default=1, verbose_name='Mahnungs ID (nächste)'),
+        ),
+        migrations.AlterField(
+            model_name='documentnumbersettings',
+            name='offer_format',
+            field=models.CharField(default='ANG-{year}-{number}', max_length=100, verbose_name='Angebotsformat'),
+        ),
+        migrations.AlterField(
+            model_name='documentnumbersettings',
+            name='offer_next_number',
+            field=models.PositiveIntegerField(default=1, verbose_name='Angebots ID (nächste)'),
+        ),
+    ]

invoices/migrations/0017_alter_reminder_status.py

@@ -0,0 +1,18 @@
+# Generated by Django 6.0.6 on 2026-06-27 06:59
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0016_documentnumbersettings_reminder_format_and_more'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='reminder',
+            name='status',
+            field=models.CharField(choices=[('draft', 'Entwurf'), ('sent', 'Versendet'), ('paid', 'Bezahlt'), ('partial', 'Teilweise bezahlt'), ('canceled', 'Storniert'), ('expired', 'Frist abgelaufen')], default='draft', max_length=20, verbose_name='Status'),
+        ),
+    ]

invoices/migrations/0018_alter_reminder_status.py

@@ -0,0 +1,18 @@
+# Generated by Django 6.0.6 on 2026-06-27 07:53
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0017_alter_reminder_status'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='reminder',
+            name='status',
+            field=models.CharField(choices=[('draft', 'Entwurf'), ('sent', 'Versendet'), ('paid', 'Bezahlt'), ('canceled', 'Storniert'), ('expired', 'Frist abgelaufen')], default='draft', max_length=20, verbose_name='Status'),
+        ),
+    ]

invoices/migrations/0019_alter_invoice_invoice_number.py

@@ -0,0 +1,18 @@
+# Generated by Django 6.0.6 on 2026-06-27 08:13
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0018_alter_reminder_status'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='invoice',
+            name='invoice_number',
+            field=models.CharField(blank=True, max_length=50, verbose_name='Rechnungsnummer'),
+        ),
+    ]

invoices/migrations/0020_alter_offer_offer_number.py

@@ -0,0 +1,18 @@
+# Generated by Django 6.0.6 on 2026-06-27 08:26
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0019_alter_invoice_invoice_number'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='offer',
+            name='offer_number',
+            field=models.CharField(blank=True, max_length=50, verbose_name='Angebotsnummer'),
+        ),
+    ]

invoices/migrations/0021_alter_reminder_reminder_number.py

@@ -0,0 +1,18 @@
+# Generated by Django 6.0.6 on 2026-06-27 08:27
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0020_alter_offer_offer_number'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='reminder',
+            name='reminder_number',
+            field=models.CharField(blank=True, max_length=50, verbose_name='Mahnungsnummer'),
+        ),
+    ]

invoices/migrations/0022_reminder_interest_rate_alter_reminder_interest.py

@@ -0,0 +1,23 @@
+# Generated by Django 6.0.6 on 2026-06-27 08:58
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0021_alter_reminder_reminder_number'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='reminder',
+            name='interest_rate',
+            field=models.DecimalField(decimal_places=2, default=0, max_digits=5, verbose_name='Verzugszinssatz (%)'),
+        ),
+        migrations.AlterField(
+            model_name='reminder',
+            name='interest',
+            field=models.DecimalField(decimal_places=2, default=0, max_digits=10, verbose_name='Verzugszinsen Betrag'),
+        ),
+    ]

invoices/migrations/0023_reminder_interest_days.py

@@ -0,0 +1,18 @@
+# Generated by Django 6.0.6 on 2026-06-27 09:00
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0022_reminder_interest_rate_alter_reminder_interest'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='reminder',
+            name='interest_days',
+            field=models.PositiveIntegerField(default=0, verbose_name='Verzugstage'),
+        ),
+    ]

invoices/migrations/0024_alter_reminder_interest_alter_reminder_interest_days_and_more.py

@@ -0,0 +1,28 @@
+# Generated by Django 6.0.6 on 2026-06-27 09:03
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0023_reminder_interest_days'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='reminder',
+            name='interest',
+            field=models.DecimalField(blank=True, decimal_places=2, default=0, max_digits=10, verbose_name='Verzugszinsen Betrag'),
+        ),
+        migrations.AlterField(
+            model_name='reminder',
+            name='interest_days',
+            field=models.PositiveIntegerField(blank=True, default=0, verbose_name='Verzugstage'),
+        ),
+        migrations.AlterField(
+            model_name='reminder',
+            name='interest_rate',
+            field=models.DecimalField(blank=True, decimal_places=2, default=0, max_digits=5, verbose_name='Verzugszinssatz (%)'),
+        ),
+    ]

invoices/migrations/0025_remove_reminder_interest_and_more.py

@@ -0,0 +1,25 @@
+# Generated by Django 6.0.6 on 2026-06-27 09:33
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('invoices', '0024_alter_reminder_interest_alter_reminder_interest_days_and_more'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='reminder',
+            name='interest',
+        ),
+        migrations.RemoveField(
+            model_name='reminder',
+            name='interest_days',
+        ),
+        migrations.RemoveField(
+            model_name='reminder',
+            name='interest_rate',
+        ),
+    ]

invoices/models.py

@@ -0,0 +1,595 @@
+from django.db import models
+from django.core.exceptions import ValidationError
+from core.models import CompanySetting
+
+class Unit(models.Model):
+    name = models.CharField(
+        max_length=50,
+        verbose_name="Bezeichnung"
+    )
+    short_name = models.CharField(
+        max_length=20,
+        verbose_name="Kürzel"
+    )
+    class Meta:
+        verbose_name = "Einheit"
+        verbose_name_plural = "Einheiten"
+        ordering = ["name"]
+    def __str__(self):
+        return self.name
+
+class Customer(models.Model):
+    class CustomerType(models.TextChoices):
+        PRIVATE = "private", "Privat"
+        COMPANY = "company", "Unternehmen"
+
+    customer_number = models.CharField(max_length=50, unique=True, verbose_name="Kunden-ID")
+    customer_type = models.CharField(max_length=20, choices=CustomerType.choices, default=CustomerType.COMPANY, verbose_name="Kundentyp")
+
+    company_name = models.CharField(max_length=255, verbose_name="Firmenname / Kundenname")
+
+    tax_number = models.CharField(max_length=100, blank=True, verbose_name="Steuernummer")
+    vat_number = models.CharField(max_length=100, blank=True, verbose_name="UST-IdNr")
+
+    phone = models.CharField(max_length=100, blank=True, verbose_name="Telefon")
+    email = models.EmailField(blank=True, verbose_name="E-Mail")
+
+    active = models.BooleanField(default=True, verbose_name="Status")
+
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        verbose_name = "Kunde"
+        verbose_name_plural = "Kunden"
+        ordering = ["company_name"]
+
+    def __str__(self):
+        return f"{self.customer_number} - {self.company_name}"
+
+
+class CustomerContact(models.Model):
+    customer = models.ForeignKey(Customer, on_delete=models.CASCADE, related_name="contacts", verbose_name="Kunde")
+
+    first_name = models.CharField(max_length=150, verbose_name="Vorname")
+    last_name = models.CharField(max_length=150, verbose_name="Nachname")
+
+    email = models.EmailField(blank=True, verbose_name="E-Mail")
+    phone = models.CharField(max_length=100, blank=True, verbose_name="Telefon")
+
+    class Meta:
+        verbose_name = "Ansprechpartner"
+        verbose_name_plural = "Ansprechpartner"
+        ordering = ["last_name", "first_name"]
+
+    def __str__(self):
+        return f"{self.first_name} {self.last_name}"
+
+
+class CustomerLocation(models.Model):
+    customer = models.ForeignKey(Customer, on_delete=models.CASCADE, related_name="locations", verbose_name="Kunde")
+
+    name = models.CharField(max_length=255, verbose_name="Bezeichnung")
+
+    zip_code = models.CharField(max_length=20, blank=True, verbose_name="PLZ")
+    city = models.CharField(max_length=255, blank=True, verbose_name="Ort")
+    street = models.CharField(max_length=255, blank=True, verbose_name="Adresse")
+    country = models.CharField(max_length=100, blank=True, verbose_name="Land")
+
+    class Meta:
+        verbose_name = "Standort"
+        verbose_name_plural = "Standorte"
+        ordering = ["name"]
+
+    def __str__(self):
+        return self.name
+
+
+class Item(models.Model):
+    class ItemType(models.TextChoices):
+        SERVICE = "service", "Dienstleistung"
+        PRODUCT = "product", "Ware"
+
+    item_type = models.CharField(max_length=20, choices=ItemType.choices, default=ItemType.PRODUCT, verbose_name="Art")
+    description = models.CharField(max_length=255, verbose_name="Beschreibung")
+    unit = models.ForeignKey(Unit,on_delete=models.PROTECT,related_name="item_items",verbose_name="Einheit")
+  
+    price_net = models.DecimalField(max_digits=10, decimal_places=2, verbose_name="Preis Netto")
+    tax_rate = models.DecimalField(
+        max_digits=5,
+        decimal_places=2,
+        default=19.00,
+        verbose_name="MwSt. Satz (%)"
+    )
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        verbose_name = "Posten"
+        verbose_name_plural = "Posten"
+        ordering = ["description"]
+
+    def __str__(self):
+        return self.description
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+class Invoice(models.Model):
+    class Status(models.TextChoices):
+        DRAFT = "draft", "Entwurf"
+        SENT = "sent", "Versendet"
+        PAID = "paid", "Bezahlt"
+        OVERDUE = "overdue", "Überfällig"
+        CANCELED = "canceled", "Storniert"
+
+    invoice_number = models.CharField(max_length=50,verbose_name="Rechnungsnummer", blank=True)
+    customer = models.ForeignKey(Customer, on_delete=models.PROTECT, related_name="invoices", null=True, blank=True, verbose_name="Kunde")
+    project = models.ForeignKey("projects.Project", on_delete=models.SET_NULL, null=True, blank=True, related_name="invoices", verbose_name="Projekt")
+    status = models.CharField(max_length=20, choices=Status.choices, default=Status.DRAFT, verbose_name="Status")
+    issue_date = models.DateField(verbose_name="Rechnungsdatum")
+    due_date = models.DateField(null=True, blank=True, verbose_name="Fälligkeitsdatum")
+    note = models.TextField(blank=True, verbose_name="Notiz")
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    pdf_file = models.FileField(upload_to="invoice_pdfs/",null=True,blank=True,verbose_name="PDF")
+    pdf_generated_at = models.DateTimeField(null=True,blank=True,verbose_name="PDF erstellt am")
+
+    cancel_number = models.CharField(max_length=50,unique=True,null=True,blank=True,verbose_name="Stornorechnungsnummer")
+    pdf_canceled_file = models.FileField(upload_to="invoice_pdfs/",null=True,blank=True,verbose_name="Stornorechnung")
+    pdf_canceled_generated_at = models.DateTimeField(null=True,blank=True,verbose_name="Stornorechnung erstellt am")
+
+    tax_number = models.CharField(max_length=100, blank=True, verbose_name="Steuernummer Kunde")
+    vat_number = models.CharField(max_length=100, blank=True, verbose_name="USt-IdNr Kunde")
+    contact_name = models.CharField(max_length=255, verbose_name="Ansprechpartner")
+    contact_email = models.EmailField(blank=True, verbose_name="E-Mail Ansprechpartner")
+    contact_phone = models.CharField(max_length=100, blank=True, verbose_name="Telefon Ansprechpartner")
+    location_name = models.CharField(max_length=255, verbose_name="Standort")
+    location_street = models.CharField(max_length=255, blank=True, verbose_name="Straße")
+    location_city = models.CharField(max_length=255, blank=True, verbose_name="Ort")
+    location_zip = models.CharField(max_length=20, blank=True, verbose_name="PLZ")
+    location_country = models.CharField(max_length=100, blank=True, verbose_name="Land")
+
+    class Meta:
+        verbose_name = "Rechnung"
+        verbose_name_plural = "Rechnungen"
+        ordering = ["-issue_date"]
+
+    def save(self, *args, **kwargs):
+
+        if self.pk:
+
+            old = Invoice.objects.get(pk=self.pk)
+
+            if old.status in [
+                self.Status.SENT,
+                self.Status.PAID,
+                self.Status.CANCELED,
+            ]:
+
+                protected_fields = [
+                    field.name
+                    for field in self._meta.fields
+                    if field.name not in [
+                        "status",
+                        "pdf_file",
+                        "pdf_generated_at",
+                        "created_at",
+                        "pdf_canceled_file",
+                        "pdf_canceled_generated_at",
+                        "cancel_number",
+                    ]
+                ]
+
+                for field in protected_fields:
+
+                    if getattr(old, field) != getattr(self, field):
+
+                        raise ValidationError(
+                            "Eine finale Rechnung kann nicht mehr bearbeitet werden."
+                        )
+
+        super().save(*args, **kwargs)
+
+    def __str__(self):
+        return self.invoice_number
+
+
+class InvoiceItem(models.Model):
+    invoice = models.ForeignKey(Invoice,on_delete=models.CASCADE,related_name="items",verbose_name="Rechnung")
+    source_type = models.CharField(max_length=20,choices=[("item","Artikel"),("time","Zeiterfassung"),("expense","Ausgabe"),],default="item",verbose_name="Quelle",)
+    item = models.ForeignKey(Item,on_delete=models.SET_NULL,null=True,blank=True,verbose_name="Artikel") # Quelle 1
+    time_entry = models.ForeignKey("time_tracking.TimeEntry",on_delete=models.SET_NULL,null=True,blank=True,verbose_name="Zeiterfassung") # Quelle 2
+    expense = models.ForeignKey("finance.Expense",on_delete=models.SET_NULL,null=True,blank=True,verbose_name="Ausgabe") # Quelle 3
+    description = models.CharField(max_length=255,verbose_name="Beschreibung")
+    quantity = models.DecimalField(max_digits=10,decimal_places=2,default=1,verbose_name="Menge")
+    unit = models.CharField(max_length=50,verbose_name="Einheit")
+    unit_price_net = models.DecimalField(max_digits=10,decimal_places=2,verbose_name="Einzelpreis Netto")
+    unit_tax_rate = models.DecimalField(max_digits=5,decimal_places=2,default=19.00,verbose_name="MwSt. Satz (%)")
+    service_period_from = models.DateField(null=True,blank=True,verbose_name="Leistungszeitraum von",)
+    service_period_to = models.DateField(null=True,blank=True,verbose_name="Leistungszeitraum bis",)
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    @property
+    def calculated_total_net(self):
+        return self.quantity * self.unit_price_net
+
+    class Meta:
+        verbose_name = "Rechnungsposition"
+        verbose_name_plural = "Rechnungspositionen"
+
+    def clean(self):
+
+        sources = [
+            self.item,
+            self.time_entry,
+            self.expense,
+        ]
+
+        selected = sum(1 for s in sources if s)
+
+        if selected != 1:
+            raise ValidationError(
+                "Genau eine Quelle muss ausgewählt werden."
+            )
+
+    def __str__(self):
+        return self.description
+        
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+class Reminder(models.Model):
+    class Status(models.TextChoices):
+        DRAFT = "draft", "Entwurf"
+        SENT = "sent", "Versendet"
+        PAID = "paid", "Bezahlt"
+        #PARTIALLY_PAID = "partial", "Teilweise bezahlt"
+        CANCELED = "canceled", "Storniert"
+        EXPIRED = "expired", "Frist abgelaufen"
+
+    invoice = models.ForeignKey("Invoice",on_delete=models.PROTECT,related_name="reminders",verbose_name="Rechnung")
+    reminder_number = models.CharField(max_length=50,verbose_name="Mahnungsnummer", blank=True)
+    
+    status = models.CharField(
+        max_length=20,
+        choices=Status.choices,
+        default=Status.DRAFT,
+        verbose_name="Status",
+    )
+    level = models.PositiveSmallIntegerField(default=1,verbose_name="Mahnstufe",help_text="1 = Erste Mahnung, 2 = Zweite Mahnung, 3 = Letzte Mahnung",)
+    issue_date = models.DateField(verbose_name="Mahndatum",)
+    due_date = models.DateField(null=True,blank=True,verbose_name="Neue Zahlungsfrist",)
+    fee = models.DecimalField(max_digits=10,decimal_places=2,default=0,verbose_name="Mahngebühr",)
+    note = models.TextField(blank=True,verbose_name="Hinweis",)
+    pdf_file = models.FileField(upload_to="reminder_pdfs/",null=True,blank=True,verbose_name="PDF",)
+    pdf_generated_at = models.DateTimeField(null=True,blank=True,verbose_name="PDF erstellt am",)
+    created_at = models.DateTimeField(auto_now_add=True,)
+
+    class Meta:
+        ordering = ["-created_at"]
+        verbose_name = "Mahnung"
+        verbose_name_plural = "Mahnungen"
+
+    def __str__(self):
+        return self.reminder_number
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+class Offer(models.Model):
+
+    class Status(models.TextChoices):
+        DRAFT = "draft", "Entwurf"
+        SENT = "sent", "Versendet"
+        ACCEPTED = "accepted", "Akzeptiert"
+        REJECTED = "rejected", "Abgelehnt"
+        EXPIRED = "expired", "Ausgelaufen"
+
+    offer_number = models.CharField(max_length=50,verbose_name="Angebotsnummer", blank=True)
+
+
+
+
+    customer = models.ForeignKey(
+        Customer,
+        on_delete=models.PROTECT,
+        related_name="offers",
+        null=True,
+        blank=True,
+        verbose_name="Kunde",
+    )
+
+    status = models.CharField(
+        max_length=20,
+        choices=Status.choices,
+        default=Status.DRAFT,
+        verbose_name="Status",
+    )
+
+    issue_date = models.DateField(
+        verbose_name="Angebotsdatum",
+    )
+
+    due_date = models.DateField(
+        null=True,
+        blank=True,
+        verbose_name="Gültig bis",
+    )
+
+    note = models.TextField(
+        blank=True,
+        verbose_name="Notiz",
+    )
+
+    created_at = models.DateTimeField(
+        auto_now_add=True,
+    )
+
+    pdf_file = models.FileField(
+        upload_to="offer_pdfs/",
+        null=True,
+        blank=True,
+        verbose_name="PDF",
+    )
+
+    pdf_generated_at = models.DateTimeField(
+        null=True,
+        blank=True,
+        verbose_name="PDF erstellt am",
+    )
+
+    tax_number = models.CharField(
+        max_length=100,
+        blank=True,
+        verbose_name="Steuernummer Kunde",
+    )
+
+    vat_number = models.CharField(
+        max_length=100,
+        blank=True,
+        verbose_name="USt-IdNr Kunde",
+    )
+
+    contact_name = models.CharField(
+        max_length=255,
+        verbose_name="Ansprechpartner",
+    )
+
+    contact_email = models.EmailField(
+        blank=True,
+        verbose_name="E-Mail Ansprechpartner",
+    )
+
+    contact_phone = models.CharField(
+        max_length=100,
+        blank=True,
+        verbose_name="Telefon Ansprechpartner",
+    )
+
+    location_name = models.CharField(
+        max_length=255,
+        verbose_name="Standort",
+    )
+
+    location_street = models.CharField(
+        max_length=255,
+        blank=True,
+        verbose_name="Straße",
+    )
+
+    location_city = models.CharField(
+        max_length=255,
+        blank=True,
+        verbose_name="Ort",
+    )
+
+    location_zip = models.CharField(
+        max_length=20,
+        blank=True,
+        verbose_name="PLZ",
+    )
+
+    location_country = models.CharField(
+        max_length=100,
+        blank=True,
+        verbose_name="Land",
+    )
+
+    class Meta:
+        verbose_name = "Angebot"
+        verbose_name_plural = "Angebote"
+        ordering = ["-issue_date"]
+
+    def save(self, *args, **kwargs):
+
+        if self.pk:
+
+            old = Offer.objects.get(pk=self.pk)
+
+            if old.status in [
+                self.Status.ACCEPTED,
+                self.Status.REJECTED,
+                self.Status.EXPIRED,
+            ]:
+
+                protected_fields = [
+                    field.name
+                    for field in self._meta.fields
+                    if field.name not in [
+                        "status",
+                        "pdf_file",
+                        "pdf_generated_at",
+                    ]
+                ]
+
+                for field in protected_fields:
+
+                    if getattr(old, field) != getattr(self, field):
+
+                        raise ValidationError(
+                            "Ein finales Angebot kann nicht mehr bearbeitet werden."
+                        )
+
+        super().save(*args, **kwargs)
+
+    def __str__(self):
+        return self.offer_number
+
+
+class OfferItem(models.Model):
+    offer = models.ForeignKey(
+        Offer,
+        on_delete=models.CASCADE,
+        related_name="items",
+        verbose_name="Angebot",
+    )
+
+    item = models.ForeignKey(
+        Item,
+        on_delete=models.SET_NULL,
+        null=True,
+        blank=True,
+        verbose_name="Artikel",
+    )
+
+    description = models.CharField(
+        max_length=255,
+        verbose_name="Beschreibung",
+    )
+
+    quantity = models.DecimalField(
+        max_digits=10,
+        decimal_places=2,
+        default=1,
+        verbose_name="Menge",
+    )
+
+    unit = models.CharField(
+        max_length=50,
+        verbose_name="Einheit",
+    )
+
+    unit_price_net = models.DecimalField(
+        max_digits=10,
+        decimal_places=2,
+        verbose_name="Einzelpreis Netto",
+    )
+
+    unit_tax_rate = models.DecimalField(
+        max_digits=5,
+        decimal_places=2,
+        default=19.00,
+        verbose_name="MwSt. Satz (%)",
+    )
+
+    created_at = models.DateTimeField(
+        auto_now_add=True,
+    )
+
+    @property
+    def calculated_total_net(self):
+        return self.quantity * self.unit_price_net
+
+    class Meta:
+        verbose_name = "Angebotsposition"
+        verbose_name_plural = "Angebotspositionen"
+
+    def __str__(self):
+        return self.description
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+        
+
+
+
+class DocumentNumberSettings(models.Model):
+    company = models.OneToOneField(CompanySetting,on_delete=models.CASCADE,related_name="number_settings",verbose_name="Unternehmen")
+    invoice_format = models.CharField(max_length=100,default="RE-{year}-{number}",verbose_name="Rechnungsformat")
+    invoice_next_number = models.PositiveIntegerField(default=1,verbose_name="Rechnungs ID (nächste)")
+    cancel_format = models.CharField(max_length=100,default="ST-{year}-{number}",verbose_name="Stornoformat")
+    cancel_next_number = models.PositiveIntegerField(default=1,verbose_name="Storno ID (nächste)")
+    offer_format = models.CharField(max_length=100,default="ANG-{year}-{number}",verbose_name="Angebotsformat")
+    offer_next_number = models.PositiveIntegerField(default=1,verbose_name="Angebots ID (nächste)")
+    reminder_format = models.CharField(max_length=100,default="M-{year}-{number}",verbose_name="Mahnungsformat")
+    reminder_next_number = models.PositiveIntegerField(default=1,verbose_name="Mahnungs ID (nächste)")
+
+    class Meta:
+        verbose_name = "Dokumentnummer"
+        verbose_name_plural = "Dokumentnummern"

invoices/settings_registry.py

@@ -0,0 +1,17 @@
+from masterdata.registry import register_setting
+
+from .models import (
+    Unit, DocumentNumberSettings
+)
+register_setting(
+    group="Rechnungswesen",
+    name="Einheiten",
+    model=Unit,
+)
+
+register_setting(
+    group="Rechnungswesen",
+    name="Dokumentnummern",
+    model=DocumentNumberSettings,
+    setting_type="single",
+)

invoices/tables.py

@@ -0,0 +1,426 @@
+import django_tables2 as tables
+from .models import Item, Customer, Reminder, Invoice, InvoiceItem, Offer, OfferItem
+
+class OfferItemTable(tables.Table):
+
+    unit_price_net = tables.TemplateColumn(
+        template_name="invoices/tables/offer_items/unit_price.html",
+        verbose_name="Einzelpreis",
+        orderable=False,
+    )
+
+    unit_tax_rate = tables.TemplateColumn(
+        template_name="invoices/tables/offer_items/tax_rate.html",
+        verbose_name="Steuerart",
+        orderable=False,
+    )
+
+    total = tables.TemplateColumn(
+        template_name="invoices/tables/offer_items/total.html",
+        verbose_name="Gesamt",
+        orderable=False,
+    )
+
+    actions = tables.TemplateColumn(
+        template_name="invoices/tables/offer_items/actions.html",
+        verbose_name="Aktionen",
+        orderable=False,
+    )
+
+    class Meta:
+        model = OfferItem
+
+        fields = (
+            "description",
+            "quantity",
+            "unit",
+            "unit_price_net",
+            "unit_tax_rate",
+            "total",
+            "actions",
+        )
+
+        attrs = {
+            "class": "w-full text-sm min-w-[700px]"
+        }
+
+
+class OfferTable(tables.Table):
+
+    customer = tables.Column(
+        accessor="customer.company_name",
+        verbose_name="Kunde"
+    )
+
+    status = tables.Column(
+        accessor="get_status_display",
+        verbose_name="Status"
+    )
+
+    issue_date = tables.DateColumn(
+        format="d.m.Y",
+        verbose_name="Datum"
+    )
+
+    due_date = tables.DateColumn(
+        format="d.m.Y",
+        verbose_name="Gültig bis"
+    )
+
+    actions = tables.TemplateColumn(
+        template_name="invoices/tables/offers/actions.html",
+        verbose_name="Aktion",
+        orderable=False
+    )
+
+    class Meta:
+        model = Offer
+
+        fields = (
+            "offer_number",
+            "customer",
+            "status",
+            "issue_date",
+            "due_date",
+            "actions",
+        )
+
+        attrs = {
+            "class": "w-full text-sm min-w-[700px]"
+        }
+
+
+class InvoiceItemTable(tables.Table):
+
+    service_period = tables.TemplateColumn(
+        template_name="invoices/tables/invoice_items/service_period.html",
+        verbose_name="Leistungsdatum",
+        orderable=False,
+    )
+
+    unit_price_net = tables.TemplateColumn(
+        template_name="invoices/tables/invoice_items/unit_price.html",
+        verbose_name="Einzelpreis",
+        orderable=False,
+    )
+
+    unit_tax_rate = tables.TemplateColumn(
+        template_name="invoices/tables/invoice_items/tax_rate.html",
+        verbose_name="Steuerart",
+        orderable=False,
+    )
+
+    total = tables.TemplateColumn(
+        template_name="invoices/tables/invoice_items/total.html",
+        verbose_name="Gesamt",
+        orderable=False,
+    )
+
+    actions = tables.TemplateColumn(
+        template_name="invoices/tables/invoice_items/actions.html",
+        verbose_name="Aktionen",
+        orderable=False,
+    )
+
+    class Meta:
+        model = InvoiceItem
+
+        fields = (
+            "description",
+            "service_period",
+            "quantity",
+            "unit",
+            "unit_price_net",
+            "unit_tax_rate",
+            "total",
+            "actions",
+        )
+
+        attrs = {
+            "class": "w-full text-sm min-w-[700px]"
+        }
+
+
+class InvoiceTable(tables.Table):
+
+    customer = tables.Column(
+        accessor="customer.company_name",
+        verbose_name="Kunde"
+    )
+
+    project = tables.Column(
+        verbose_name="Projekt",
+    )
+
+    status = tables.Column(
+        accessor="get_status_display",
+        verbose_name="Status"
+    )
+
+    issue_date = tables.DateColumn(
+        format="d.m.Y",
+        verbose_name="Datum"
+    )
+
+    due_date = tables.DateColumn(
+        format="d.m.Y",
+        verbose_name="Fälligkeitsdatum"
+    )
+
+
+    actions = tables.TemplateColumn(
+        template_name="invoices/tables/invoices/actions.html",
+        verbose_name="Aktion",
+        orderable=False
+    )
+
+
+    class Meta:
+
+        model = Invoice
+
+        fields = (
+            "invoice_number",
+            "customer",
+            "project",
+            "status",
+            "issue_date",
+            "due_date",
+            "actions",
+        )
+
+        attrs = {
+            "class": "w-full text-sm min-w-[700px]"
+        }
+
+class ReminderTable(tables.Table):
+
+    invoice = tables.TemplateColumn(
+        template_name="invoices/tables/reminders/invoice.html",
+        verbose_name="Rechnung",
+        orderable=False
+    )
+
+    level = tables.Column(
+        verbose_name="Mahnstufe"
+    )
+
+    status = tables.Column(
+        accessor="get_status_display",
+        verbose_name="Status"
+    )
+
+    issue_date = tables.DateColumn(
+        format="d.m.Y",
+        verbose_name="Datum"
+    )
+
+    due_date = tables.DateColumn(
+        format="d.m.Y",
+        verbose_name="Neue Zahlungsfrist"
+    )
+
+    actions = tables.TemplateColumn(
+        template_name="invoices/tables/reminders/actions.html",
+        verbose_name="Aktion",
+        orderable=False
+    )
+
+
+    class Meta:
+
+        model = Reminder
+
+        fields = (
+            "reminder_number",
+            "invoice",
+            "level",
+            "status",
+            "issue_date",
+            "due_date",
+            "actions",
+        )
+
+        attrs = {
+            "class": "w-full text-sm min-w-[700px]"
+        }
+
+class ItemTable(tables.Table):
+    item_type = tables.TemplateColumn(
+        template_name="invoices/tables/items/item_type.html",
+        verbose_name="Typ",
+        orderable=False
+    )
+
+    description = tables.TemplateColumn(
+        template_name="invoices/tables/items/description.html",
+        verbose_name="Beschreibung",
+        orderable=False
+    )
+
+    unit = tables.TemplateColumn(
+        template_name="invoices/tables/items/unit.html",
+        verbose_name="Einheit",
+        orderable=False
+    )
+
+    price_net = tables.TemplateColumn(
+        template_name="invoices/tables/items/price_net.html",
+        verbose_name="Preis Netto",
+        orderable=False
+    )
+
+    tax_rate = tables.TemplateColumn(
+        template_name="invoices/tables/items/tax_rate.html",
+        verbose_name="MwSt. Satz (%)",
+        orderable=False
+    )
+
+    actions = tables.TemplateColumn(
+        template_name="invoices/tables/items/actions.html",
+        verbose_name="Aktion",
+        orderable=False
+    )
+
+
+    class Meta:
+        model = Item
+        fields = (
+            "item_type",
+            "description",
+            "unit",
+            "price_net",
+            "tax_rate",
+            "actions",
+        )
+        attrs = {
+            "class": "w-full text-sm min-w-[700px]"
+        }
+
+
+
+
+
+class CustomerTable(tables.Table):
+    toggle_prefix = "customer"
+
+    detail_template = (
+        "invoices/tables/customer/detail.html"
+    )
+
+    customer_number = tables.Column(
+        verbose_name="Kunden-ID"
+    )
+
+    company_name = tables.Column(
+        verbose_name="Name"
+    )
+
+    customer_type = tables.Column(
+        accessor="get_customer_type_display",
+        verbose_name="Typ"
+    )
+
+    phone = tables.Column(
+        verbose_name="Telefon"
+    )
+
+    email = tables.Column(
+        verbose_name="E-Mail"
+    )
+
+    tax_number = tables.Column(
+        verbose_name="Steuernummer"
+    )
+
+    vat_number = tables.Column(
+        verbose_name="UST-IdNr"
+    )
+
+
+    class Meta:
+        model = Customer
+
+        template_name = (
+            "django_tables2/table_toggle.html"
+        )
+
+        fields = (
+            "customer_number",
+            "company_name",
+            "customer_type",
+            "phone",
+            "email",
+            "tax_number",
+            "vat_number",
+        )
+
+        attrs = {
+            "class": "w-full text-sm min-w-[700px]"
+        }
+
+
+
+
+
+
+
+
+
+class CustomerArchivedTable(tables.Table):
+    toggle_prefix = "customer"
+
+    detail_template = (
+        "invoices/tables/customer/detail_archived.html"
+    )
+
+    customer_number = tables.Column(
+        verbose_name="Kunden-ID"
+    )
+
+    company_name = tables.Column(
+        verbose_name="Name"
+    )
+
+    customer_type = tables.Column(
+        accessor="get_customer_type_display",
+        verbose_name="Typ"
+    )
+
+    phone = tables.Column(
+        verbose_name="Telefon"
+    )
+
+    email = tables.Column(
+        verbose_name="E-Mail"
+    )
+
+    tax_number = tables.Column(
+        verbose_name="Steuernummer"
+    )
+
+    vat_number = tables.Column(
+        verbose_name="UST-IdNr"
+    )
+
+
+    class Meta:
+        model = Customer
+
+        template_name = (
+            "django_tables2/table_toggle.html"
+        )
+
+        fields = (
+            "customer_number",
+            "company_name",
+            "customer_type",
+            "phone",
+            "email",
+            "tax_number",
+            "vat_number",
+        )
+
+        attrs = {
+            "class": "w-full text-sm min-w-[700px]"
+        }

invoices/templates/invoices/customers/add.html

@@ -0,0 +1,36 @@
+{% extends "base.html" %}
+
+{% block title %}
+Rechnungswesen - Kunden
+{% endblock %}
+
+{% block header_title %}
+Kunde hinzufügen
+{% endblock %}
+
+{% block header_description %}
+Neuen Kunden anlegen
+{% endblock %}
+
+{% block content %}
+
+<div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors mb-8">
+
+    <form method="post" enctype="multipart/form-data" class="space-y-4">
+        {% csrf_token %}
+
+        <div class="grid grid-cols-1 gap-4">
+            {{ form.as_p }}
+        </div>
+
+        <button
+            type="submit"
+            class="btn mt-4 btn-save">
+            Speichern
+        </button>
+
+    </form>
+
+</div>
+
+{% endblock %}

invoices/templates/invoices/customers/detail.html

@@ -0,0 +1,230 @@
+{% extends "base.html" %}
+
+{% block title %}
+Rechnungswesen - Kunden
+{% endblock %}
+
+{% block header_title %}
+{{ customer.customer_number }} - {{ customer.company_name }}
+{% endblock %}
+
+{% block header_description %}
+Kunde bearbeiten
+{% endblock %}
+
+{% block content %}
+<form method="post" action="{% url 'invoices:customers_edit' customer.id %}">
+    {% csrf_token %}
+
+    <div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+
+        <h2 class="text-xl font-bold mb-2">Kundendaten</h2>
+
+        <div class="grid md:grid-cols-2 gap-4 mb-8">
+
+            {% for field in form %}
+            <div>
+                <label class="block text-sm font-medium mb-1">
+                    {{ field.label }}
+                </label>
+
+                {{ field }}
+
+                {% if field.errors %}
+                <div class="text-red-600 text-sm mt-1">
+                    {{ field.errors }}
+                </div>
+                {% endif %}
+            </div>
+            {% endfor %}
+
+        </div>
+
+
+    <div class="grid lg:grid-cols-2 gap-8">
+
+        <!-- Ansprechpartner -->
+        <div>
+
+            <h2 class="font-bold text-lg mb-2">
+                Ansprechpartner
+            </h2>
+
+            {% for contact in customer.contacts.all %}
+            <div class="bg-slate-100 dark:bg-slate-700 rounded-xl p-4 mb-3">
+
+                <div class="grid md:grid-cols-2 gap-3">
+
+                    <input
+                        type="text"
+                        name="contact_first_name_{{ contact.id }}"
+                        value="{{ contact.first_name }}"
+                        placeholder="Vorname"
+                        class="border rounded px-3 py-2">
+
+                    <input
+                        type="text"
+                        name="contact_last_name_{{ contact.id }}"
+                        value="{{ contact.last_name }}"
+                        placeholder="Nachname"
+                        class="border rounded px-3 py-2">
+
+                    <input
+                        type="email"
+                        name="contact_email_{{ contact.id }}"
+                        value="{{ contact.email }}"
+                        placeholder="E-Mail"
+                        class="border rounded px-3 py-2">
+
+                    <input
+                        type="text"
+                        name="contact_phone_{{ contact.id }}"
+                        value="{{ contact.phone }}"
+                        placeholder="Telefon"
+                        class="border rounded px-3 py-2">
+
+                </div>
+
+                <button type="submit"
+                        name="delete_contact_id"
+                        value="{{ contact.id }}"
+                        class="btn btn-delete">
+                    Löschen
+                </button>
+
+            </div>
+            {% endfor %}
+
+            <div id="contacts-container"></div>
+
+            <button
+                type="button"
+                onclick="addContact()"
+                class="btn btn-add">
+                + Ansprechpartner hinzufügen
+            </button>
+
+        </div>
+
+
+        <!-- Standorte -->
+        <div>
+
+            <h2 class="font-bold text-lg mb-2">
+                Standorte
+            </h2>
+
+            {% for location in customer.locations.all %}
+            <div class="bg-slate-100 dark:bg-slate-700 rounded-xl p-4 mb-3">
+
+                <div class="grid md:grid-cols-2 gap-3">
+
+                    <input
+                        type="text"
+                        name="location_name_{{ location.id }}"
+                        value="{{ location.name }}"
+                        placeholder="Name"
+                        class="border rounded px-3 py-2">
+
+                    <input
+                        type="text"
+                        name="location_street_{{ location.id }}"
+                        value="{{ location.street }}"
+                        placeholder="Straße"
+                        class="border rounded px-3 py-2">
+
+                    <input
+                        type="text"
+                        name="location_zip_{{ location.id }}"
+                        value="{{ location.zip_code }}"
+                        placeholder="PLZ"
+                        class="border rounded px-3 py-2">
+
+                    <input
+                        type="text"
+                        name="location_city_{{ location.id }}"
+                        value="{{ location.city }}"
+                        placeholder="Ort"
+                        class="border rounded px-3 py-2">
+
+                    <input
+                        type="text"
+                        name="location_country_{{ location.id }}"
+                        value="{{ location.country }}"
+                        placeholder="Land"
+                        class="border rounded px-3 py-2 md:col-span-2">
+
+                </div>
+
+                <button type="submit"
+                        name="delete_location_id"
+                        value="{{ location.id }}"
+                        class="btn btn-delete">
+                    Löschen
+                </button>
+
+            </div>
+            {% endfor %}
+
+            <div id="locations-container"></div>
+
+            <button
+                type="button"
+                onclick="addLocation()"
+                class="btn btn-add">
+                + Standort hinzufügen
+            </button>
+
+        </div>
+
+    </div>
+
+
+    <button
+        type="submit"
+        class="btn mt-8 btn-save">
+        Speichern
+    </button>
+
+</div>
+
+</form>
+
+
+<script>
+
+function addContact() {
+    document.getElementById("contacts-container").insertAdjacentHTML("beforeend", `
+        <div class="contact-card bg-slate-100 dark:bg-slate-700 rounded-xl p-4 mb-3">
+            <div class="grid md:grid-cols-2 gap-3">
+
+                <input type="text" name="new_contact_first_name" placeholder="Vorname" class="border rounded px-3 py-2">
+                <input type="text" name="new_contact_last_name" placeholder="Nachname" class="border rounded px-3 py-2">
+                <input type="email" name="new_contact_email" placeholder="E-Mail" class="border rounded px-3 py-2">
+                <input type="text" name="new_contact_phone" placeholder="Telefon" class="border rounded px-3 py-2">
+
+            </div>
+        </div>
+    `);
+}
+
+function addLocation() {
+    document.getElementById("locations-container").insertAdjacentHTML("beforeend", `
+        <div class="location-card bg-slate-100 dark:bg-slate-700 rounded-xl p-4 mb-3">
+
+            <div class="grid md:grid-cols-2 gap-3">
+
+                <input type="text" name="new_location_name" placeholder="Name" class="border rounded px-3 py-2">
+                <input type="text" name="new_location_street" placeholder="Straße" class="border rounded px-3 py-2">
+                <input type="text" name="new_location_zip" placeholder="PLZ" class="border rounded px-3 py-2">
+                <input type="text" name="new_location_city" placeholder="Ort" class="border rounded px-3 py-2">
+                <input type="text" name="new_location_country" placeholder="Land" class="border rounded px-3 py-2 md:col-span-2">
+
+            </div>
+        </div>
+    `);
+}
+
+</script>
+
+{% endblock %}

invoices/templates/invoices/customers/overview.html

@@ -0,0 +1,62 @@
+{% extends "base.html" %}
+
+{% block title %}
+Rechnungswesen - Kunden
+{% endblock %}
+
+{% block header_title %}
+Kunden
+{% endblock %}
+
+{% block header_description %}
+Kundenstammdaten verwalten
+{% endblock %}
+
+{% block content %}
+{% load django_tables2 %}
+<div class="mb-8">
+    <div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+        <div class="flex flex-col sm:flex-row sm:justify-between sm:items-center gap-4">
+            <div>
+                <h2 class="text-xl font-bold">Aktionen</h2>
+                <p class="text-slate-400 text-sm mt-1">
+                    Kunden anlegen
+                </p>
+            </div>
+            <div class="flex flex-col sm:flex-row gap-2">
+                <a href="{% url 'invoices:customers_add' %}"
+                class="btn btn-add">
+                    + Kunde
+                </a>
+            </div>
+        </div>
+    </div>
+</div>
+
+<div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors mb-8">
+
+    <div class="mb-6">
+        <h2 class="text-xl font-bold">Kundenliste</h2>
+        <p class="text-slate-400 text-sm mt-1">Alle Kunden, inkl. Standorte und Ansprechpartner</p>
+    </div>
+
+    <div class="overflow-x-auto rounded-xl">
+        {% render_table table %}
+    </div>
+</div>
+
+
+<div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+
+    <div class="mb-6">
+        <h2 class="text-xl font-bold">Archivierte Kunden</h2>
+        <p class="text-slate-400 text-sm mt-1">Alle inaktiven Kunden, inkl. Standorte und Ansprechpartner</p>
+    </div>
+
+    <div class="overflow-x-auto rounded-xl">
+
+       {% render_table table_archived %}
+    </div>
+</div>
+
+{% endblock %}

invoices/templates/invoices/invoices/add_customer.html

@@ -0,0 +1,69 @@
+{% extends "base.html" %}
+
+{% block title %}Rechnungswesen - Rechnungen{% endblock %}
+
+{% block header_title %}
+Kundenrechnung
+{% endblock %}
+
+{% block header_description %}
+Rechnung auf Basis eines Kunden erstellen
+{% endblock %}
+
+{% block content %}
+
+<div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+
+    <form method="post" enctype="multipart/form-data" class="space-y-4">
+        {% csrf_token %}
+
+        {{ form.as_p }}
+
+        <button class="btn btn-save">
+            Speichern
+        </button>
+
+    </form>
+
+</div>
+
+<script>
+document.addEventListener("DOMContentLoaded", function () {
+
+    const customer = document.getElementById("id_customer");
+    const contact = document.getElementById("id_contact");
+    const location = document.getElementById("id_location");
+
+    function fill(select, data) {
+        select.innerHTML = "<option value=''>---------</option>";
+        data.forEach(item => {
+            select.innerHTML += `<option value="${item.id}">${item.text}</option>`;
+        });
+    }
+
+    if (customer) {
+        customer.addEventListener("change", function () {
+
+            const id = this.value;
+
+            if (!id) {
+                contact.innerHTML = "";
+                location.innerHTML = "";
+                return;
+            }
+
+            fetch(`/invoices/ajax/customer/${id}/contacts/`)
+                .then(r => r.json())
+                .then(data => fill(contact, data));
+
+            fetch(`/invoices/ajax/customer/${id}/locations/`)
+                .then(r => r.json())
+                .then(data => fill(location, data));
+
+        });
+    }
+
+});
+</script>
+
+{% endblock %}

invoices/templates/invoices/invoices/add_project.html

@@ -0,0 +1,221 @@
+{% extends "base.html" %}
+
+{% block title %}Rechnungswesen - Rechnungen{% endblock %}
+
+{% block header_title %}
+Projektrechnung
+{% endblock %}
+
+{% block header_description %}
+Rechnung auf Basis eines Projekts erstellen
+{% endblock %}
+
+{% block content %}
+
+<div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+
+    <form method="post" enctype="multipart/form-data" class="space-y-4">
+        {% csrf_token %}
+
+        {{ form.as_p }}
+
+        <button class="btn btn-save">
+            Speichern
+        </button>
+
+    </form>
+
+</div>
+
+
+<script>
+document.addEventListener("DOMContentLoaded", function () {
+
+    const project = document.getElementById("id_project");
+
+    const contact = document.getElementById("id_contact");
+    const location = document.getElementById("id_location");
+
+
+    const customerFields = [
+        "id_contact",
+        "id_location"
+    ];
+
+
+    const manualFields = [
+        "id_contact_name_manual",
+        "id_contact_email_manual",
+        "id_contact_phone_manual",
+
+        "id_location_name_manual",
+        "id_location_street_manual",
+        "id_location_zip_manual",
+        "id_location_city_manual",
+        "id_location_country_manual"
+    ];
+
+
+
+    function hideField(id){
+
+        const field = document.getElementById(id);
+
+        if(field){
+            const row = field.closest("p");
+            row.style.display = "none";
+        }
+
+    }
+
+
+
+    function showField(id){
+
+        const field = document.getElementById(id);
+
+        if(field){
+            const row = field.closest("p");
+            row.style.display = "";
+        }
+
+    }
+
+
+
+    function hideCustomerFields(){
+
+        customerFields.forEach(hideField);
+
+    }
+
+
+    function showCustomerFields(){
+
+        customerFields.forEach(showField);
+
+    }
+
+
+
+    function hideManualFields(){
+
+        manualFields.forEach(hideField);
+
+    }
+
+
+
+    function showManualFields(){
+
+        manualFields.forEach(showField);
+
+    }
+
+
+
+    function fill(select, data){
+
+        if(!select){
+            return;
+        }
+
+        select.innerHTML = "<option value=''>---------</option>";
+
+        data.forEach(item => {
+
+            select.innerHTML += `
+                <option value="${item.id}">
+                    ${item.text}
+                </option>
+            `;
+
+        });
+
+    }
+
+
+
+    function checkProject(projectId){
+
+        if(!projectId){
+
+            hideCustomerFields();
+            hideManualFields();
+
+            return;
+
+        }
+
+
+        fetch(`/invoices/ajax/project/${projectId}/invoice-data/`)
+
+
+        .then(response => response.json())
+
+
+        .then(data => {
+
+
+            if(data.has_customer){
+
+
+                showCustomerFields();
+
+                hideManualFields();
+
+
+                fill(
+                    contact,
+                    data.contacts
+                );
+
+
+                fill(
+                    location,
+                    data.locations
+                );
+
+
+            } else {
+
+
+                hideCustomerFields();
+
+                showManualFields();
+
+
+            }
+
+
+        });
+
+    }
+
+
+
+    // Anfang prüfen
+    if(project.value){
+
+        checkProject(project.value);
+
+    } else {
+
+        hideCustomerFields();
+        hideManualFields();
+
+    }
+
+
+
+    project.addEventListener("change", function(){
+
+        checkProject(this.value);
+
+    });
+
+
+
+});
+</script>
+{% endblock %}

invoices/templates/invoices/invoices/detail.html

@@ -0,0 +1,239 @@
+{% extends "base.html" %}
+
+{% block title %}Rechnungswesen - Rechnungen{% endblock %}
+
+{% block header_title %}
+Rechnung {{ invoice.invoice_number }}
+{% endblock %}
+
+{% block header_description %}
+Details & Positionen
+{% endblock %}
+
+{% block content %}
+{% load django_tables2 %}
+<div class="mb-8">
+    <div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+        <div class="flex flex-col sm:flex-row sm:justify-between sm:items-center gap-4">
+            <div>
+                <h2 class="text-xl font-bold">Aktionen</h2>
+                <p class="text-slate-400 text-sm mt-1">
+                    Positionen zur Rechnung hinzufügen
+                </p>
+            </div>
+            <div class="flex flex-col sm:flex-row gap-2">
+                {% if invoice.status == "draft" %}
+                    <a href="{% url 'invoices:invoice_item_add' invoice.id %}" class="btn btn-add">+ Position</a>
+                    <a href="{% url 'invoices:invoices_preview' invoice.id %}" class="btn btn-action">Vorschau</a>
+                    <a href="{% url 'invoices:invoices_download' invoice.id %}" onclick="startDownloadAndRedirect()" class="btn btn-action">Download</a>
+                    <a href="{% url 'invoices:invoices_delete' invoice.id %}" class="btn btn-delete">Löschen</a>
+                {% endif %}
+                {% if invoice.status == "sent" %}
+                    <a href="{% url 'invoices:invoices_download' invoice.id %}" class="btn btn-action">Download</a>
+                    <a href="{% url 'invoices:invoices_cancel' invoice.id %}" onclick="startDownloadAndRedirect()" class="btn btn-delete">Stornieren</a>
+                    <a href="{% url 'invoices:invoices_paid' invoice.id %}" class="btn btn-action">Zahlung verbuchen</a>
+                    <a href="{% url 'invoices:invoices_overdue' invoice.id %}" class="btn btn-action">Überfällig</a>
+                {% endif %}
+                {% if invoice.status == "paid" %}
+                    <a href="{% url 'invoices:invoices_download' invoice.id %}" class="btn btn-action">Download</a>
+                    <a href="{% url 'invoices:invoices_cancel' invoice.id %}" onclick="startDownloadAndRedirect()"  class="btn btn-delete">Stornieren</a>
+                {% endif %}
+                {% if invoice.status == "canceled" %}
+                    <a href="{% url 'invoices:invoices_download' invoice.id %}" class="btn btn-action">Download</a>
+                    <a href="{% url 'invoices:invoices_cancel' invoice.id %}" class="btn btn-action">Stornorechnung</a>
+                {% endif %}
+                {% if invoice.status == "overdue" %}
+                    <a href="{% url 'invoices:invoices_download' invoice.id %}" class="btn btn-action">Download</a>
+                {% endif %}
+            </div>
+            
+        </div>
+    </div>
+</div>
+
+{% if reminders %}
+<div class="mb-8 p-6 border border-orange-500  rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+
+    <h2 class="text-xl font-bold mb-6 text-orange-500">Mahnungen</h2>
+
+    <div class="grid grid-cols-1 lg:grid-cols-3 gap-6">
+        {% for reminder in reminders %}
+        {% if reminder.status != "canceled" %}
+        <div class="bg-slate-100 dark:bg-slate-700 rounded-xl p-6">
+
+            <div class="flex justify-between items-start">
+
+                <div>
+                    <a href="{% url 'invoices:reminders_detail' reminder.id %}" class="company_link">
+                        {{ reminder.reminder_number }}
+                    </a>
+
+                    <p class="text-sm text-slate-500 dark:text-slate-300 mt-1">
+                        Mahnstufe {{ reminder.level }}
+                        · {{ reminder.issue_date|date:"d.m.Y" }}
+                    </p>
+                </div>
+
+
+                <span class="px-3 py-1 rounded-full text-xs font-medium bg-slate-200 text-slate-700 dark:bg-slate-600 dark:text-slate-200">
+                    {{ reminder.get_status_display }}
+                </span>
+
+            </div>
+
+
+            <div class="mt-4 text-sm text-slate-600 dark:text-slate-300">
+
+                {% if reminder.due_date %}
+                    <p>
+                        Neue Zahlungsfrist:
+                        <span class="font-medium">
+                            {{ reminder.due_date|date:"d.m.Y" }}
+                        </span>
+                    </p>
+                {% endif %}
+
+
+                {% if reminder.fee %}
+                    <p>
+                        Mahngebühr:
+                        <span class="font-medium">
+                            {{ reminder.fee|floatformat:2 }} €
+                        </span>
+                    </p>
+                {% endif %}
+
+            </div>
+
+        </div>
+        {% endif %}
+        {% endfor %}
+    </div>
+</div>
+{% endif %}
+
+<!-- HEADER INFO -->
+<div class="mb-8 p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+
+    <h2 class="text-xl font-bold mb-6">Allgemein</h2>
+
+    <div class="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-6">
+
+        <!-- Kunde -->
+        <div>
+            <div class="text-slate-400 text-sm">Kunde</div>
+            <div class="font-semibold">{{ invoice.customer.company_name }}</div>
+        </div>
+
+        <!-- Projekt -->
+        <div>
+            <div class="text-slate-400 text-sm">Projekt</div>
+            <div class="font-semibold">
+                {% if invoice.project %}
+                    {{ invoice.project.name }}
+                {% else %}
+                    -
+                {% endif %}
+            </div>
+        </div>
+
+        <!-- Status -->
+        <div>
+            <div class="text-slate-400 text-sm">Status</div>
+            <div class="font-semibold">{{ invoice.get_status_display }}</div>
+        </div>
+
+        <!-- Datum -->
+        <div>
+            <div class="text-slate-400 text-sm">Rechnungsdatum</div>
+            <div class="font-semibold">{{ invoice.issue_date|date:"d.m.Y" }}</div>
+        </div>
+
+        <div>
+            <div class="text-slate-400 text-sm">Fälligkeitsdatum</div>
+            <div class="font-semibold">{{ invoice.due_date|date:"d.m.Y" }}</div>
+        </div>
+    </div>
+</div>
+
+
+<!-- SNAPSHOT: KONTAKT & ADRESSE -->
+<div class="mb-8 p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+
+    <h2 class="text-xl font-bold mb-6">Rechnungsadresse</h2>
+
+    <div class="grid grid-cols-1 sm:grid-cols-2 gap-6">
+
+        <!-- Kontakt -->
+        <div>
+            <div class="text-slate-400 text-sm">Ansprechpartner</div>
+            <div class="font-semibold">{{ invoice.contact_name|default:"-" }}</div>
+
+            {% if invoice.contact_email %}
+                <div class="text-slate-400 text-sm">{{ invoice.contact_email }}</div>
+            {% endif %}
+
+            {% if invoice.contact_phone %}
+                <div class="text-slate-400 text-sm">{{ invoice.contact_phone }}</div>
+            {% endif %}
+        </div>
+
+        <!-- Adresse -->
+        <div>
+            <div class="text-slate-400 text-sm">Standort</div>
+
+            <div class="font-semibold">
+                {{ invoice.location_name|default:"-" }}
+            </div>
+
+            <div class="text-slate-400 text-sm">
+                {{ invoice.location_street }}
+            </div>
+
+            <div class="text-slate-400 text-sm">
+                {{ invoice.location_zip }} {{ invoice.location_city }}
+            </div>
+
+            <div class="text-slate-400 text-sm">
+                {{ invoice.location_country }}
+            </div>
+        </div>
+
+    </div>
+</div>
+
+
+<div class="mb-8 p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+    <h2 class="text-xl font-bold mb-6">Rechnungshinweis</h2>
+    <div class="grid grid-cols-1 gap-6">
+        <div>
+            <div class="font-semibold">{{ invoice.note|default:"-" }}</div>
+        </div>
+    </div>
+</div>
+
+
+<!-- POSITIONEN -->
+<div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+
+    <h2 class="text-xl font-bold mb-6">Positionen</h2>
+
+    <div class="overflow-x-auto rounded-xl">
+        {% render_table table %}
+
+    </div>
+
+
+    <div class="mt-4 text-right font-bold">
+        Gesamt: {{ total_net|floatformat:2 }} €
+    </div>
+
+</div>
+<script>
+function startDownloadAndRedirect() {
+    setTimeout(function() {
+        window.location.href = "{% url 'invoices:invoices_detail' invoice.id %}";
+    }, 1000);
+}
+</script>
+{% endblock %}

invoices/templates/invoices/invoices/item_add.html

@@ -0,0 +1,197 @@
+{% extends "base.html" %}
+
+{% block title %}
+Rechnungswesen - Rechnungen
+{% endblock %}
+
+{% block header_title %}
+Rechnungsposition hinzufügen
+{% endblock %}
+
+{% block header_description %}
+Neue Rechnungsposition anlegen
+{% endblock %}
+
+{% block content %}
+
+<div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+
+    <form method="post" enctype="multipart/form-data" class="space-y-4">
+        {% csrf_token %}
+
+        {{ form.as_p }}
+
+        <button class="btn btn-save">
+            Speichern
+        </button>
+
+    </form>
+
+</div>
+
+
+<script>
+document.addEventListener("DOMContentLoaded", function () {
+
+    const source = document.getElementById("id_source_type");
+
+    const fields = {
+        item: document.getElementById("id_item"),
+        time: document.getElementById("id_time_entry"),
+        expense: document.getElementById("id_expense"),
+    };
+
+
+    function toggleFields() {
+
+        const value = source.value;
+
+
+        Object.keys(fields).forEach(key => {
+
+            const field = fields[key];
+
+            if (!field) {
+                return;
+            }
+
+
+            const row = field.closest("p");
+
+
+            if (key === value) {
+
+                row.style.display = "";
+
+            } else {
+
+                row.style.display = "none";
+
+                field.value = "";
+
+            }
+
+        });
+
+    }
+
+
+    source.addEventListener(
+        "change",
+        toggleFields
+    );
+
+
+    // Initial ausführen
+    toggleFields();
+
+});
+</script>
+
+<script>
+
+document.addEventListener("DOMContentLoaded", function () {
+
+
+const source = document.getElementById("id_source_type");
+
+
+const selects = {
+
+    item: document.getElementById("id_item"),
+
+    time: document.getElementById("id_time_entry"),
+
+    expense: document.getElementById("id_expense"),
+
+};
+
+
+const description = document.getElementById(
+    "id_description"
+);
+
+const quantity = document.getElementById(
+    "id_quantity"
+);
+
+const unit = document.getElementById(
+    "id_unit"
+);
+
+const price = document.getElementById(
+    "id_unit_price_net"
+);
+
+const tax = document.getElementById(
+    "id_unit_tax_rate"
+);
+
+
+
+function loadData(type, id){
+
+
+    if(!id){
+        return;
+    }
+
+
+    fetch(
+        `/invoices/ajax/invoice-item-data/?source=${type}&id=${id}`
+    )
+
+
+    .then(response => response.json())
+
+
+    .then(data => {
+
+
+        description.value = data.description;
+
+        quantity.value = data.quantity;
+
+        unit.value = data.unit;
+
+        price.value = data.unit_price_net;
+
+        tax.value = data.unit_tax_rate;
+
+
+    });
+
+
+}
+
+
+
+Object.keys(selects).forEach(type => {
+
+
+    if(selects[type]){
+
+
+        selects[type].addEventListener(
+            "change",
+            function(){
+
+                loadData(
+                    type,
+                    this.value
+                );
+
+            }
+        );
+
+
+    }
+
+
+});
+
+
+});
+
+</script>
+{% endblock %}

invoices/templates/invoices/invoices/overview.html

@@ -0,0 +1,35 @@
+{% extends "base.html" %}
+
+{% block title %}Rechnungswesen - Rechnungen{% endblock %}
+
+{% block header_title %}Rechnungen{% endblock %}
+{% block header_description %}Rechnungen erstellen und verwalten{% endblock %}
+
+{% block content %}
+{% load django_tables2 %}
+<div class="mb-8">
+    <div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+        <div class="flex flex-col sm:flex-row sm:justify-between sm:items-center gap-4">
+            <div>
+                <h2 class="text-xl font-bold">Aktionen</h2>
+                <p class="text-slate-400 text-sm mt-1">Neue Rechnung erstellen</p>
+            </div>
+
+            <div class="flex flex-col sm:flex-row gap-2">
+                <a href="{% url 'invoices:invoice_add_customer' %}" class="btn btn-add">+ Kundenrechnung</a>
+                <a href="{% url 'invoices:invoice_add_project' %}" class="btn btn-add">+ Projektrechnung</a>
+            </div>
+        </div>
+    </div>
+</div>
+<div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+    <div class="mb-6">
+        <h2 class="text-xl font-bold">Rechnungen</h2>
+        <p class="text-slate-400 text-sm mt-1">Alle Rechnungen mit aktuellem Status</p>
+    </div>
+    <div class="overflow-x-auto rounded-xl">
+        {% render_table table %}
+    </div>
+</div>
+
+{% endblock %}

invoices/templates/invoices/invoices/pdf.html

@@ -0,0 +1,747 @@
+<!DOCTYPE html>
+<html lang="de">
+
+<head>
+
+<meta charset="UTF-8">
+
+<style>
+
+@page {
+    size: A4;
+    margin: 18mm;
+}
+
+
+body {
+    font-family: Arial, sans-serif;
+    font-size: 11px;
+    color: #334155;
+}
+
+
+h1,h2,h3,p {
+    margin:0;
+}
+
+
+table {
+    width:100%;
+    border-collapse:collapse;
+}
+
+
+
+.header {
+    display:flex;
+    justify-content:space-between;
+}
+
+
+.logo {
+    height:128px;
+    margin-bottom:15px;
+}
+
+
+.company-name {
+    font-size:24px;
+    font-weight:bold;
+}
+
+
+.invoice-title {
+    font-size:32px;
+    font-weight:bold;
+}
+
+
+
+.info-table td {
+    padding:4px 0;
+}
+
+
+.label {
+    color:#64748b;
+    padding-right:30px;
+}
+
+
+
+
+.divider {
+    border-top:1px solid #e2e8f0;
+    margin:30px 0;
+}
+
+
+
+
+.receiver-title {
+    font-size:10px;
+    text-transform:uppercase;
+    color:#64748b;
+    letter-spacing:1px;
+}
+
+
+.receiver-name {
+    font-size:16px;
+    font-weight:bold;
+    margin-top:5px;
+}
+
+
+
+
+
+.invoice-heading {
+    font-size:22px;
+    font-weight:bold;
+    margin-bottom:10px;
+}
+
+
+
+
+.items-wrapper {
+    border:1px solid #e2e8f0;
+    border-radius:10px;
+    overflow:hidden;
+    margin-top:20px;
+}
+
+
+.items {
+    width:100%;
+    border-collapse:collapse;
+}
+
+
+.items thead th:first-child {
+    border-top-left-radius:10px;
+}
+
+
+.items thead th:last-child {
+    border-top-right-radius:10px;
+}
+
+
+.items th {
+    background:{{ company.color }};
+    color:white;
+    padding:10px;
+    text-align:left;
+}
+
+
+.items td {
+    padding:10px;
+    border-bottom:1px solid #e2e8f0;
+}
+
+
+.items tbody tr:last-child td {
+    border-bottom:none;
+}
+
+
+.right {
+    text-align:right;
+}
+
+
+
+.total-box {
+
+    margin-top:30px;
+    margin-left:auto;
+    width:250px;
+
+}
+
+
+.total-row {
+
+    display:flex;
+    justify-content:space-between;
+    padding:6px 0;
+
+}
+
+
+
+.total-final {
+
+    border-top:1px solid #cbd5e1;
+    margin-top:10px;
+    padding-top:10px;
+    font-size:16px;
+    font-weight:bold;
+
+}
+
+
+
+
+.note {
+    margin-top:30px;
+    padding:12px;
+    border:1px solid #e2e8f0;
+    border-radius: 10px;
+}
+
+
+
+.small-business {
+
+    margin-top:25px;
+    color:#64748b;
+
+}
+
+
+
+@page {
+    size: A4;
+    margin: 18mm 18mm 35mm 18mm;
+}
+
+
+.footer {
+    position: fixed;
+    bottom: -25mm;
+    left: 0;
+    right: 0;
+
+    padding-top:15px;
+    border-top:1px solid #e2e8f0;
+
+    display:flex;
+    justify-content:space-between;
+
+    font-size:10px;
+    color:#64748b;
+}
+
+
+.footer-title {
+    font-weight:bold;
+    color:#334155;
+    margin-bottom:5px;
+}
+
+
+</style>
+
+</head>
+
+
+<body>
+
+
+<!-- HEADER -->
+
+
+<div class="header">
+
+
+<div>
+
+            {% if company.logo %}
+                <img src="{{ company.logo.url }}" class="logo">
+            {% else %}
+                <h1 class="company-name" style="color: {{ company.color }}">
+                    {{ company.companyname }}
+                </h1>
+
+                {% if company.slogan %}
+                    <p>
+                        {{ company.slogan }}
+                    </p>
+                {% endif %}
+            {% endif %}
+
+
+
+<p style="margin-top:15px">
+{{ company.name }}<br>
+{{ company.street }} · {{ company.zip }} {{ company.city }}
+</p>
+
+
+</div>
+
+
+
+<div style="text-align:right">
+
+
+<div class="invoice-title">
+RECHNUNG
+</div>
+
+
+<table class="info-table">
+
+
+<tr>
+<td class="label">
+Rechnungsnummer
+</td>
+
+<td>
+{{ invoice.invoice_number }}
+</td>
+</tr>
+
+
+<tr>
+<td class="label">
+Rechnungsdatum
+</td>
+
+<td>
+{{ invoice.issue_date|date:"d.m.Y" }}
+</td>
+</tr>
+
+
+
+{% if invoice.due_date %}
+
+<tr>
+
+<td class="label">
+Fälligkeitsdatum
+</td>
+
+<td>
+{{ invoice.due_date|date:"d.m.Y" }}
+</td>
+
+</tr>
+
+{% endif %}
+
+
+</table>
+
+
+</div>
+
+
+</div>
+
+
+
+<div class="divider"></div>
+
+
+
+
+<!-- EMPFÄNGER -->
+
+
+<div>
+
+
+<div class="receiver-title">
+Rechnungsempfänger
+</div>
+
+
+
+<div class="receiver-name">
+
+{% if invoice.customer.type == "company" %}
+{{ invoice.customer.company_name }}
+{% else %}
+{{ invoice.contact_name }}
+{% endif %}
+
+</div>
+
+
+{% if invoice.customer.type == "company" %}
+
+<p>
+z.Hd. {{ invoice.contact_name }}
+</p>
+
+{% endif %}
+
+
+<p style="margin-top:10px">
+
+{{ invoice.location_street }}<br>
+
+{{ invoice.location_zip }}
+{{ invoice.location_city }}
+
+</p>
+
+
+</div>
+
+
+
+
+
+<!-- TITEL -->
+
+
+<div style="margin-top:40px">
+
+
+<div class="invoice-heading"
+style="color:{{ company.color }}">
+
+Rechnung
+
+</div>
+
+
+{% if company.invoice_header_text %}
+
+<p>
+{{ company.invoice_header_text|linebreaksbr }}
+</p>
+
+{% endif %}
+
+
+</div>
+
+
+
+
+
+<!-- POSITIONEN -->
+
+<div class="items-wrapper">
+<table class="items">
+
+
+<thead>
+
+<tr>
+
+<th>
+Nr.
+</th>
+
+<th>
+Beschreibung
+</th>
+
+                    {% if show_service_date %}
+                        <th class="left">Leistungsdatum</th>
+                    {% endif %}
+
+<th class="left">
+Menge
+</th>
+
+<th class="left">
+Einheit
+</th>
+
+<th class="left">
+Preis
+</th>
+
+
+{% if not company.is_small_business %}
+
+<th class="left">
+Steuer
+</th>
+
+{% endif %}
+
+
+<th class="left">
+Gesamt
+</th>
+
+
+</tr>
+
+</thead>
+
+
+
+<tbody>
+
+
+{% for item in items %}
+
+<tr>
+
+
+<td>
+{{ forloop.counter }}
+</td>
+
+
+<td>
+{{ item.description }}
+</td>
+
+
+                    {% if show_service_date %}
+                        <td class="left">
+                            {% if item.service_period_from %}
+                                {{ item.service_period_from|date:"d.m.Y" }}
+                            {% endif %}
+                            {% if item.service_period_to %}
+                                - {{ item.service_period_to|date:"d.m.Y" }}
+                            {% endif %}
+                        </td>
+                    {% endif %}
+
+<td class="left">
+{{ item.quantity }}
+</td>
+
+
+<td class="left">
+{{ item.unit }}
+</td>
+
+
+<td class="left">
+{{ item.unit_price_net|floatformat:2 }} €
+</td>
+
+
+{% if not company.is_small_business %}
+
+<td class="left">
+{{ item.unit_tax_rate|floatformat:0 }} %
+</td>
+
+{% endif %}
+
+
+
+<td class="left">
+{{ item.calculated_total_net|floatformat:2 }} €
+</td>
+
+
+
+</tr>
+
+
+{% endfor %}
+
+
+</tbody>
+
+
+</table>
+</div>
+
+
+
+
+<!-- SUMMEN -->
+
+
+<div class="total-box">
+
+
+<div class="total-row">
+
+<span>
+Netto
+</span>
+
+<span>
+{{ total_net|floatformat:2 }} €
+</span>
+
+</div>
+
+
+
+{% if not company.is_small_business %}
+{% for tax_rate,tax_amount in tax_summary.items %}
+
+<div class="total-row">
+
+<span>
+Umsatzsteuer {{ tax_rate|floatformat:0 }} %
+</span>
+
+
+<span>
+{{ tax_amount|floatformat:2 }} €
+</span>
+
+
+</div>
+
+
+{% endfor %}
+
+{% endif %}
+
+
+
+
+<div class="total-row total-final">
+
+<span>
+Gesamt
+</span>
+
+
+<span>
+
+{% if company.is_small_business %}
+{{ total_net|floatformat:2 }}
+{% else %}
+{{ total_gross|floatformat:2 }}
+{% endif %}
+
+€
+
+</span>
+
+
+</div>
+
+
+</div>
+
+
+
+
+
+{% if invoice.note %}
+
+<div class="note">
+
+<div class="receiver-title">
+Rechnungshinweis
+</div>
+
+<br>
+
+{{ invoice.note|linebreaksbr }}
+
+</div>
+
+{% endif %}
+
+
+
+
+
+
+{% if company.is_small_business %}
+
+<div class="note">
+
+    <div class="receiver-title">
+        Kleinunternehmerhinweis
+    </div>
+    <br>
+    {{ company.small_business_text }}
+</div>
+
+{% endif %}
+
+
+
+
+
+<!-- FOOTER -->
+
+
+<div class="footer">
+
+
+<div>
+
+<div class="footer-title">
+Kontakt
+</div>
+
+{% if company.phone %}
+{{ company.phone }}<br>
+{% endif %}
+
+{% if company.email %}
+{{ company.email }}<br>
+{% endif %}
+
+{% if company.website %}
+{{ company.website }}
+{% endif %}
+
+</div>
+
+
+
+
+<div>
+
+<div class="footer-title">
+Steuern
+</div>
+
+
+{% if company.tax_number %}
+Steuernummer: {{ company.tax_number }}<br>
+{% endif %}
+
+
+{% if company.vat_number %}
+USt-IdNr.: {{ company.vat_number }}
+{% endif %}
+
+
+</div>
+
+
+
+
+
+<div>
+
+<div class="footer-title">
+Bank
+</div>
+
+
+{% if company.bank_name %}
+{{ company.bank_name }}<br>
+{% endif %}
+
+
+{% if company.iban %}
+IBAN: {{ company.iban }}<br>
+{% endif %}
+
+
+{% if company.bic %}
+BIC: {{ company.bic }}
+{% endif %}
+
+
+</div>
+
+
+</div>
+
+
+
+</body>
+
+</html>

invoices/templates/invoices/invoices/pdf_cancel.html

@@ -0,0 +1,756 @@
+<!DOCTYPE html>
+<html lang="de">
+
+<head>
+
+<meta charset="UTF-8">
+
+<style>
+
+@page {
+    size: A4;
+    margin: 18mm;
+}
+
+
+body {
+    font-family: Arial, sans-serif;
+    font-size: 11px;
+    color: #334155;
+}
+
+
+h1,h2,h3,p {
+    margin:0;
+}
+
+
+table {
+    width:100%;
+    border-collapse:collapse;
+}
+
+
+
+.header {
+    display:flex;
+    justify-content:space-between;
+}
+
+
+.logo {
+    height:128px;
+    margin-bottom:15px;
+}
+
+
+.company-name {
+    font-size:24px;
+    font-weight:bold;
+}
+
+
+.invoice-title {
+    font-size:32px;
+    font-weight:bold;
+}
+
+
+
+.info-table td {
+    padding:4px 0;
+}
+
+
+.label {
+    color:#64748b;
+    padding-right:30px;
+}
+
+
+
+
+.divider {
+    border-top:1px solid #e2e8f0;
+    margin:30px 0;
+}
+
+
+
+
+.receiver-title {
+    font-size:10px;
+    text-transform:uppercase;
+    color:#64748b;
+    letter-spacing:1px;
+}
+
+
+.receiver-name {
+    font-size:16px;
+    font-weight:bold;
+    margin-top:5px;
+}
+
+
+
+
+
+.invoice-heading {
+    font-size:22px;
+    font-weight:bold;
+    margin-bottom:10px;
+}
+
+
+
+
+.items-wrapper {
+    border:1px solid #e2e8f0;
+    border-radius:10px;
+    overflow:hidden;
+    margin-top:20px;
+}
+
+
+.items {
+    width:100%;
+    border-collapse:collapse;
+}
+
+
+.items thead th:first-child {
+    border-top-left-radius:10px;
+}
+
+
+.items thead th:last-child {
+    border-top-right-radius:10px;
+}
+
+
+.items th {
+    background:{{ company.color }};
+    color:white;
+    padding:10px;
+    text-align:left;
+}
+
+
+.items td {
+    padding:10px;
+    border-bottom:1px solid #e2e8f0;
+}
+
+
+.items tbody tr:last-child td {
+    border-bottom:none;
+}
+
+
+.right {
+    text-align:right;
+}
+
+
+
+.total-box {
+
+    margin-top:30px;
+    margin-left:auto;
+    width:250px;
+
+}
+
+
+.total-row {
+
+    display:flex;
+    justify-content:space-between;
+    padding:6px 0;
+
+}
+
+
+
+.total-final {
+
+    border-top:1px solid #cbd5e1;
+    margin-top:10px;
+    padding-top:10px;
+    font-size:16px;
+    font-weight:bold;
+
+}
+
+
+
+
+.note {
+    margin-top:30px;
+    padding:12px;
+    border:1px solid #e2e8f0;
+    border-radius: 10px;
+}
+
+
+
+.small-business {
+
+    margin-top:25px;
+    color:#64748b;
+
+}
+
+
+
+@page {
+    size: A4;
+    margin: 18mm 18mm 35mm 18mm;
+}
+
+
+.footer {
+    position: fixed;
+    bottom: -25mm;
+    left: 0;
+    right: 0;
+
+    padding-top:15px;
+    border-top:1px solid #e2e8f0;
+
+    display:flex;
+    justify-content:space-between;
+
+    font-size:10px;
+    color:#64748b;
+}
+
+
+.footer-title {
+    font-weight:bold;
+    color:#334155;
+    margin-bottom:5px;
+}
+
+
+</style>
+
+</head>
+
+
+<body>
+
+
+<!-- HEADER -->
+
+
+<div class="header">
+
+
+<div>
+
+            {% if company.logo %}
+                <img src="{{ company.logo.url }}" class="logo">
+            {% else %}
+                <h1 class="company-name" style="color: {{ company.color }}">
+                    {{ company.companyname }}
+                </h1>
+
+                {% if company.slogan %}
+                    <p>
+                        {{ company.slogan }}
+                    </p>
+                {% endif %}
+            {% endif %}
+
+
+
+<p style="margin-top:15px">
+{{ company.name }}<br>
+{{ company.street }} · {{ company.zip }} {{ company.city }}
+</p>
+
+
+</div>
+
+
+
+<div style="text-align:right">
+
+
+    <div class="invoice-title">
+    STORNO
+    </div>
+
+<table class="info-table">
+
+<tr>
+    <td class="label">
+        Stornonummer
+    </td>
+
+    <td>
+        {{ cancel_number }}
+    </td>
+</tr>
+
+<tr>
+    <td class="label">
+        Stornodatum
+    </td>
+
+    <td>
+        {{ cancel_date|date:"d.m.Y" }}
+    </td>
+</tr>
+
+<tr>
+    <td class="label">
+        Ursprüngliche Rechnung
+    </td>
+
+    <td>
+        {{ invoice.invoice_number }}
+    </td>
+</tr>
+
+<tr>
+    <td class="label">
+        Rechnungsdatum
+    </td>
+
+    <td>
+        {{ invoice.issue_date|date:"d.m.Y" }}
+    </td>
+</tr>
+
+</table>
+
+</div>
+
+
+</div>
+
+
+
+<div class="divider"></div>
+
+
+
+
+<!-- EMPFÄNGER -->
+
+
+<div>
+
+
+<div class="receiver-title">
+Rechnungsempfänger
+</div>
+
+
+
+<div class="receiver-name">
+
+{% if invoice.customer.type == "company" %}
+{{ invoice.customer.company_name }}
+{% else %}
+{{ invoice.contact_name }}
+{% endif %}
+
+</div>
+
+
+{% if invoice.customer.type == "company" %}
+
+<p>
+z.Hd. {{ invoice.contact_name }}
+</p>
+
+{% endif %}
+
+
+<p style="margin-top:10px">
+
+{{ invoice.location_street }}<br>
+
+{{ invoice.location_zip }}
+{{ invoice.location_city }}
+
+</p>
+
+
+</div>
+
+
+
+
+
+<!-- TITEL -->
+
+
+<div style="margin-top:40px">
+
+
+<div class="invoice-heading"
+style="color:{{ company.color }}">
+Stornorechnung
+</div>
+
+<p style="margin-top:10px;">
+Diese Stornorechnung storniert die Rechnung
+<strong>{{ invoice.invoice_number }}</strong>
+vom {{ invoice.issue_date|date:"d.m.Y" }} vollständig.
+</p>
+
+<p style="margin-top:5px;">
+Stornodatum: {{ cancel_date|date:"d.m.Y" }}
+</p>
+
+
+</div>
+
+
+
+
+
+<!-- POSITIONEN -->
+
+<div class="items-wrapper">
+<table class="items">
+
+
+<thead>
+
+<tr>
+
+<th>
+Nr.
+</th>
+
+<th>
+Beschreibung
+</th>
+
+                    {% if show_service_date %}
+                        <th class="left">Leistungsdatum</th>
+                    {% endif %}
+
+<th class="left">
+Menge
+</th>
+
+<th class="left">
+Einheit
+</th>
+
+<th class="left">
+Preis
+</th>
+
+
+{% if not company.is_small_business %}
+
+<th class="left">
+Steuer
+</th>
+
+{% endif %}
+
+
+<th class="left">
+Gesamt
+</th>
+
+
+</tr>
+
+</thead>
+
+
+
+<tbody>
+
+
+{% for item in items %}
+
+<tr>
+
+
+<td>
+{{ forloop.counter }}
+</td>
+
+
+<td>
+{{ item.description }}
+</td>
+
+
+                    {% if show_service_date %}
+                        <td class="left">
+                            {% if item.service_period_from %}
+                                {{ item.service_period_from|date:"d.m.Y" }}
+                            {% endif %}
+                            {% if item.service_period_to %}
+                                - {{ item.service_period_to|date:"d.m.Y" }}
+                            {% endif %}
+                        </td>
+                    {% endif %}
+
+<td class="left">
+{{ item.quantity }}
+</td>
+
+
+<td class="left">
+{{ item.unit }}
+</td>
+
+
+<td class="left">
+-{{ item.unit_price_net|floatformat:2 }} €
+</td>
+
+
+{% if not company.is_small_business %}
+
+<td class="left">
+{{ item.unit_tax_rate|floatformat:0 }} %
+</td>
+
+{% endif %}
+
+
+
+<td class="left">
+-{{ item.calculated_total_net|floatformat:2 }} €
+</td>
+
+
+
+</tr>
+
+
+{% endfor %}
+
+
+</tbody>
+
+
+</table>
+</div>
+
+
+
+
+<!-- SUMMEN -->
+
+
+<div class="total-box">
+
+
+<div class="total-row">
+
+<span>
+Netto
+</span>
+
+<span>
+-{{ total_net|floatformat:2 }} €
+</span>
+
+</div>
+
+
+
+{% if not company.is_small_business %}
+{% for tax_rate,tax_amount in tax_summary.items %}
+
+<div class="total-row">
+
+<span>
+Umsatzsteuer {{ tax_rate|floatformat:0 }} %
+</span>
+
+
+<span>
+-{{ tax_amount|floatformat:2 }} €
+</span>
+
+
+</div>
+
+
+{% endfor %}
+
+{% endif %}
+
+
+
+
+<div class="total-row total-final">
+
+<span>
+Gesamt
+</span>
+
+
+<span>
+
+{% if company.is_small_business %}
+-{{ total_net|floatformat:2 }}
+{% else %}
+-{{ total_gross|floatformat:2 }}
+{% endif %}
+
+€
+
+</span>
+
+
+</div>
+
+
+</div>
+
+<div class="note">
+
+    <div class="receiver-title">
+        Stornohinweis
+    </div>
+
+    <br>
+
+    Die Rechnung {{ invoice.invoice_number }}
+    wird durch diese Stornorechnung vollständig aufgehoben.
+
+    {% if original_status == "paid" %}
+
+        <br><br>
+
+        Die ursprüngliche Rechnung wurde bereits bezahlt.
+
+        Es entsteht ein Guthaben in Höhe von
+
+        {% if company.is_small_business %}
+            {{ total_net|floatformat:2 }}
+        {% else %}
+            {{ total_gross|floatformat:2 }}
+        {% endif %}
+
+        €.
+
+        Die Rückerstattung erfolgt separat.
+
+    {% endif %}
+
+</div>
+
+
+
+
+
+
+{% if company.is_small_business %}
+
+<div class="note">
+
+    <div class="receiver-title">
+        Kleinunternehmerhinweis
+    </div>
+    <br>
+    {{ company.small_business_text }}
+</div>
+
+{% endif %}
+
+
+
+
+
+<!-- FOOTER -->
+
+
+<div class="footer">
+
+
+<div>
+
+<div class="footer-title">
+Kontakt
+</div>
+
+{% if company.phone %}
+{{ company.phone }}<br>
+{% endif %}
+
+{% if company.email %}
+{{ company.email }}<br>
+{% endif %}
+
+{% if company.website %}
+{{ company.website }}
+{% endif %}
+
+</div>
+
+
+
+
+<div>
+
+<div class="footer-title">
+Steuern
+</div>
+
+
+{% if company.tax_number %}
+Steuernummer: {{ company.tax_number }}<br>
+{% endif %}
+
+
+{% if company.vat_number %}
+USt-IdNr.: {{ company.vat_number }}
+{% endif %}
+
+
+</div>
+
+
+
+
+
+<div>
+
+<div class="footer-title">
+Bank
+</div>
+
+
+{% if company.bank_name %}
+{{ company.bank_name }}<br>
+{% endif %}
+
+
+{% if company.iban %}
+IBAN: {{ company.iban }}<br>
+{% endif %}
+
+
+{% if company.bic %}
+BIC: {{ company.bic }}
+{% endif %}
+
+
+</div>
+
+
+</div>
+
+
+
+</body>
+
+</html>

invoices/templates/invoices/invoices/preview.html

@@ -0,0 +1,465 @@
+{% extends "base.html" %}
+
+{% block title %}Rechnungswesen - Rechnungen{% endblock %}
+
+{% block header_title %}Rechnung {{ invoice.invoice_number }}{% endblock %}
+
+{% block header_description %}Vorschau{% endblock %}
+
+{% block content %}
+
+<div class="max-w-5xl w-5xl mx-auto bg-white rounded-2xl shadow p-10 text-slate-900">
+
+    <!-- HEADER -->
+    <div class="flex justify-between items-start">
+
+        <div>
+            {% if company.logo %}
+                <img src="{{ company.logo.url }}" class="h-32 mb-4">
+            {% else %}
+                <h1 class="text-2xl font-bold" style="color: {{ company.color }}">
+                    {{ company.companyname }}
+                </h1>
+
+                {% if company.slogan %}
+                    <p class="text-sm text-slate-600 mt-1">
+                        {{ company.slogan }}
+                    </p>
+                {% endif %}
+            {% endif %}
+
+            
+
+            <div class="mt-4 text-sm">
+                <p>{{ company.name }}</p>
+                <p>
+                    {{ company.street }}
+                    ·
+                    {{ company.zip }}
+                    {{ company.city }}
+                </p>
+            </div>
+        </div>
+
+
+        <div class="text-right">
+
+            <h2 class="text-3xl font-bold ">
+                RECHNUNG
+            </h2>
+
+
+            <table class="mt-4 text-sm ml-auto">
+
+                <tr>
+                    <td class="text-slate-600 pr-8 py-1">
+                        Rechnungsnummer
+                    </td>
+                    <td class="font-medium">
+                        {{ invoice.invoice_number }}
+                    </td>
+                </tr>
+
+                <tr>
+                    <td class="text-slate-600 pr-8 py-1">
+                        Rechnungsdatum
+                    </td>
+                    <td class="font-medium">
+                        {{ invoice.issue_date|date:"d.m.Y" }}
+                    </td>
+                </tr>
+
+
+                {% if invoice.due_date %}
+                <tr>
+                    <td class="text-slate-600 pr-8 py-1">
+                        Fälligkeitsdatum
+                    </td>
+                    <td class="font-medium">
+                        {{ invoice.due_date|date:"d.m.Y" }}
+                    </td>
+                </tr>
+                {% endif %}
+
+            </table>
+
+        </div>
+
+    </div>
+
+
+    <div class="my-8 border-t"></div>
+
+
+    <!-- EMPFÄNGER -->
+
+    <div class="mb-10">
+
+        <p class="text-xs uppercase tracking-wide text-slate-600 mb-2">
+            Rechnungsempfänger
+        </p>
+
+        <p class="font-semibold text-lg ">
+
+            {% if invoice.customer.type == "company" %}
+                {{ invoice.customer.company_name }}
+            {% else %}
+                {{ invoice.contact_name }}
+            {% endif %}
+
+        </p>
+
+
+        {% if invoice.customer.type == "company" %}
+            <p class="text-sm">
+                z.Hd. {{ invoice.contact_name }}
+            </p>
+        {% endif %}
+
+
+        <p class="mt-2 text-sm">
+            {{ invoice.location_street }}<br>
+            {{ invoice.location_zip }}
+            {{ invoice.location_city }}
+        </p>
+
+    </div>
+
+
+
+    <!-- TITEL -->
+
+    <div class="mb-8">
+
+        <h2 class="text-2xl font-bold" style="color: {{ company.color }}">
+            Rechnung
+        </h2>
+
+
+        {% if company.invoice_header_text %}
+        <div class="mt-3 text-sm text-slate-600">
+            {{ company.invoice_header_text|linebreaks }}
+        </div>
+        {% endif %}
+
+    </div>
+
+
+
+    <!-- POSITIONEN -->
+
+    <div class="border rounded-xl overflow-hidden">
+
+        <table class="w-full text-sm">
+
+            <thead>
+
+                <tr style="background-color: {{ company.color }}" class="text-white">
+
+                    <th class="p-3 text-left">
+                        Nr.
+                    </th>
+
+                    <th class="p-3 text-left">
+                        Beschreibung
+                    </th>
+
+                    {% if show_service_date %}
+                        <th class="p-3 text-left">Leistungsdatum</th>
+                    {% endif %}
+
+                    <th class="p-3 text-right">
+                        Menge
+                    </th>
+
+                    <th class="p-3 text-right">
+                        Einheit
+                    </th>
+
+                    <th class="p-3 text-right">
+                        Preis
+                    </th>
+
+
+                    {% if not company.is_small_business %}
+                    <th class="p-3 text-right">
+                        Steuer
+                    </th>
+                    {% endif %}
+
+
+                    <th class="p-3 text-right">
+                        Gesamt
+                    </th>
+
+                </tr>
+
+            </thead>
+
+
+            <tbody>
+
+            {% for item in items %}
+
+                <tr class="border-t">
+
+                    <td class="p-3 text-left">
+                        {{ forloop.counter }}
+                    </td>
+
+                    <td class="p-3 text-left">
+                        {{ item.description }}
+                    </td>
+
+                    {% if show_service_date %}
+                        <td class="p-3 text-left">
+                            {% if item.service_period_from %}
+                                {{ item.service_period_from|date:"d.m.Y" }}
+                            {% endif %}
+                            {% if item.service_period_to %}
+                                - {{ item.service_period_to|date:"d.m.Y" }}
+                            {% endif %}
+                        </td>
+                    {% endif %}
+
+                    <td class="p-3 text-right">
+                        {{ item.quantity }}
+                    </td>
+
+                    <td class="p-3 text-right">
+                        {{ item.unit }}
+                    </td>
+
+                    <td class="p-3 text-right">
+                        {{ item.unit_price_net|floatformat:2 }} €
+                    </td>
+
+
+                    {% if not company.is_small_business %}
+                    <td class="p-3 text-right">
+                        {{ item.unit_tax_rate|floatformat:0 }} %
+                    </td>
+                    {% endif %}
+
+
+                    <td class="p-3 text-right font-medium">
+                        {{ item.calculated_total_net|floatformat:2 }} €
+                    </td>
+
+                </tr>
+
+            {% endfor %}
+
+            </tbody>
+
+        </table>
+
+    </div>
+
+    <!-- SUMMEN -->
+
+    <div class="flex justify-end mt-8">
+
+        <div class="w-80 text-sm">
+
+            <div class="flex justify-between py-2">
+                <span class="text-slate-600">
+                    Netto
+                </span>
+
+                <span>
+                    {{ total_net|floatformat:2 }} €
+                </span>
+            </div>
+
+
+            {% if not company.is_small_business %}
+
+                {% for tax_rate, tax_amount in tax_summary.items %}
+
+                <div class="flex justify-between py-2">
+
+                    <span class="text-slate-600">
+                        Umsatzsteuer {{ tax_rate|floatformat:0 }} %
+                    </span>
+
+                    <span>
+                        {{ tax_amount|floatformat:2 }} €
+                    </span>
+
+                </div>
+
+                {% endfor %}
+
+            {% endif %}
+
+
+
+            <div class="border-t mt-3 pt-4 flex justify-between text-lg font-bold ">
+
+                <span>
+                    Gesamt
+                </span>
+
+                <span>
+                    {% if company.is_small_business %}
+                        {{ total_net|floatformat:2 }} €
+                    {% else %}
+                        {{ total_gross|floatformat:2 }} €
+                    {% endif %}
+                    
+                </span>
+
+            </div>
+
+        </div>
+
+    </div>
+
+
+
+
+
+    <!-- NOTIZ -->
+
+    {% if invoice.note %}
+
+    <div class="mt-10 border rounded-xl p-4">
+
+        <p class="text-xs uppercase tracking-wide text-slate-600 mb-2">
+            Rechnungshinweis
+        </p>
+
+
+        <div class="text-sm">
+            {{ invoice.note|linebreaks }}
+        </div>
+
+    </div>
+
+    {% endif %}
+
+
+
+
+<!-- KLEINUNTERNEHMER -->
+{% if company.is_small_business %}
+
+<div class="mt-10 border rounded-xl p-4">
+
+    <p class="text-xs uppercase tracking-wide text-slate-600 mb-2">
+        Kleinunternehmerhinweis
+    </p>
+    <div class="text-sm">
+    {{ company.small_business_text }}
+    </div>
+</div>
+
+{% endif %}
+
+
+
+
+    <!-- FOOTER -->
+
+    <div class="mt-14 pt-6 border-t grid grid-cols-3 gap-6 text-xs text-slate-600">
+
+
+        <!-- KONTAKT -->
+
+        <div>
+
+            <p class="font-semibold  mb-2">
+                Kontakt
+            </p>
+
+
+            {% if company.phone %}
+                <p>{{ company.phone }}</p>
+            {% endif %}
+
+
+            {% if company.email %}
+                <p>{{ company.email }}</p>
+            {% endif %}
+
+
+            {% if company.website %}
+                <p>{{ company.website }}</p>
+            {% endif %}
+
+        </div>
+
+
+
+
+        <!-- STEUERN -->
+
+        <div>
+
+            <p class="font-semibold  mb-2">
+                Steuern
+            </p>
+
+
+            {% if company.tax_number %}
+                <p>
+                    Steuernummer:
+                    {{ company.tax_number }}
+                </p>
+            {% endif %}
+
+
+            {% if company.vat_number %}
+                <p>
+                    USt-IdNr.:
+                    {{ company.vat_number }}
+                </p>
+            {% endif %}
+
+        </div>
+
+
+
+
+
+        <!-- BANK -->
+
+        <div>
+
+            <p class="font-semibold  mb-2">
+                Bankverbindung
+            </p>
+
+
+            {% if company.bank_name %}
+                <p>
+                    {{ company.bank_name }}
+                </p>
+            {% endif %}
+
+
+            {% if company.iban %}
+                <p>
+                    IBAN:
+                    {{ company.iban }}
+                </p>
+            {% endif %}
+
+
+            {% if company.bic %}
+                <p>
+                    BIC:
+                    {{ company.bic }}
+                </p>
+            {% endif %}
+
+        </div>
+
+
+    </div>
+
+
+</div>
+
+{% endblock %}

invoices/templates/invoices/items/add.html

@@ -0,0 +1,36 @@
+{% extends "base.html" %}
+
+{% block title %}
+Rechnungswesen - Posten
+{% endblock %}
+
+{% block header_title %}
+Posten hinzufügen
+{% endblock %}
+
+{% block header_description %}
+Neue Ware oder Leistung hinzufügen
+{% endblock %}
+
+{% block content %}
+
+<div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+
+    <form method="post" enctype="multipart/form-data" class="space-y-4">
+        {% csrf_token %}
+
+        <div class="grid grid-cols-1 gap-4">
+            {{ form.as_p }}
+        </div>
+
+        <button
+            type="submit"
+            class="btn mt-4 btn-save">
+            Speichern
+        </button>
+
+    </form>
+
+</div>
+
+{% endblock %}

invoices/templates/invoices/items/overview.html

@@ -0,0 +1,56 @@
+{% extends "base.html" %}
+
+{% block title %}
+Rechnungswesen - Posten
+{% endblock %}
+
+{% block header_title %}
+Posten
+{% endblock %}
+
+{% block header_description %}
+Leistungen und Artikel verwalten
+{% endblock %}
+
+{% block content %}
+{% load django_tables2 %}
+<div class="mb-8">
+    <div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+        <div class="flex flex-col sm:flex-row sm:justify-between sm:items-center gap-4">
+            <div>
+                <h2 class="text-xl font-bold">Aktionen</h2>
+                <p class="text-slate-400 text-sm mt-1">
+                    Leistungen und Artikel anlegen
+                </p>
+            </div>
+            <div class="flex flex-col sm:flex-row gap-2">
+                <a href="{% url 'invoices:items_add' %}"
+                class="btn btn-add">
+                    + Posten
+                </a>
+            </div>
+        </div>
+    </div>
+</div>
+
+<div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors mt-8">
+
+    <div class="flex flex-wrap justify-between items-center mb-6">
+
+        <div>
+            <h2 class="text-xl font-bold">
+                Artikel und Leistungen
+            </h2>
+
+            <p class="text-slate-400 text-sm mt-1">
+                Übersicht über alle Artikel und Leistungen
+            </p>
+        </div>
+    </div>
+
+    <div class="overflow-x-auto rounded-xl">
+        {% render_table table %}
+        
+    </div>
+</div>
+{% endblock %}

invoices/templates/invoices/offers/add.html

@@ -0,0 +1,69 @@
+{% extends "base.html" %}
+
+{% block title %}Rechnungswesen - Angebote{% endblock %}
+
+{% block header_title %}
+Angebot erstellen
+{% endblock %}
+
+{% block header_description %}
+Angebot für einen Kunden erstellen
+{% endblock %}
+
+{% block content %}
+
+<div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+
+    <form method="post" enctype="multipart/form-data" class="space-y-4">
+        {% csrf_token %}
+
+        {{ form.as_p }}
+
+        <button class="btn btn-save">
+            Speichern
+        </button>
+
+    </form>
+
+</div>
+
+<script>
+document.addEventListener("DOMContentLoaded", function () {
+
+    const customer = document.getElementById("id_customer");
+    const contact = document.getElementById("id_contact");
+    const location = document.getElementById("id_location");
+
+    function fill(select, data) {
+        select.innerHTML = "<option value=''>---------</option>";
+        data.forEach(item => {
+            select.innerHTML += `<option value="${item.id}">${item.text}</option>`;
+        });
+    }
+
+    if (customer) {
+        customer.addEventListener("change", function () {
+
+            const id = this.value;
+
+            if (!id) {
+                contact.innerHTML = "";
+                location.innerHTML = "";
+                return;
+            }
+
+            fetch(`/invoices/ajax/customer/${id}/contacts/`)
+                .then(r => r.json())
+                .then(data => fill(contact, data));
+
+            fetch(`/invoices/ajax/customer/${id}/locations/`)
+                .then(r => r.json())
+                .then(data => fill(location, data));
+
+        });
+    }
+
+});
+</script>
+
+{% endblock %}

invoices/templates/invoices/offers/detail.html

@@ -0,0 +1,156 @@
+{% extends "base.html" %}
+
+{% block title %}Rechnungswesen - Angebote{% endblock %}
+
+{% block header_title %}
+Angebot {{ offer.offer_number }}
+{% endblock %}
+
+{% block header_description %}
+Details & Positionen
+{% endblock %}
+
+{% block content %}
+{% load django_tables2 %}
+<div class="mb-8">
+    <div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+        <div class="flex flex-col sm:flex-row sm:justify-between sm:items-center gap-4">
+            <div>
+                <h2 class="text-xl font-bold">Aktionen</h2>
+                <p class="text-slate-400 text-sm mt-1">
+                    Positionen zum Angebot hinzufügen
+                </p>
+            </div>
+            <div class="flex flex-col sm:flex-row gap-2">
+                {% if offer.status == "draft" %}
+                    <a href="{% url 'invoices:offers_item_add' offer.id %}" class="btn btn-add">+ Position</a>
+                    <a href="{% url 'invoices:offers_preview' offer.id %}" class="btn btn-action">Vorschau</a>
+                    <a href="{% url 'invoices:offers_download' offer.id %}" onclick="startDownloadAndRedirect()" class="btn btn-action">Download</a>
+                    <a href="{% url 'invoices:offers_delete' offer.id %}" class="btn btn-delete">Löschen</a>
+                {% endif %}
+                {% if offer.status == "sent" %}
+                    <a href="{% url 'invoices:offers_download' offer.id %}" class="btn btn-action">Download</a>
+                    <a href="{% url 'invoices:offers_accept' offer.id %}" class="btn btn-action">Akzeptiert</a>
+                    <a href="{% url 'invoices:offers_reject' offer.id %}" class="btn btn-action">Abgelehnt</a>
+                    <a href="{% url 'invoices:offers_expire' offer.id %}" class="btn btn-action">Ausgelaufen</a>
+                {% endif %}
+                {% if offer.status == "accepted" or offer.status == "rejected" or offer.status == "expired" %}
+                    <a href="{% url 'invoices:offers_download' offer.id %}" class="btn btn-action">Download</a>
+                {% endif %}
+            </div>
+            
+        </div>
+    </div>
+</div>
+
+<!-- HEADER INFO -->
+<div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors mb-8">
+
+    <h2 class="text-xl font-bold mb-6">Allgemein</h2>
+
+    <div class="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-6">
+
+        <!-- Kunde -->
+        <div>
+            <div class="text-slate-400 text-sm">Kunde</div>
+            <div class="font-semibold">{{ offer.customer.company_name }}</div>
+        </div>
+
+        <!-- Status -->
+        <div>
+            <div class="text-slate-400 text-sm">Status</div>
+            <div class="font-semibold">{{ offer.get_status_display }}</div>
+        </div>
+
+        <!-- Datum -->
+        <div>
+            <div class="text-slate-400 text-sm">Angebotsdatum</div>
+            <div class="font-semibold">{{ offer.issue_date|date:"d.m.Y" }}</div>
+        </div>
+
+        <div>
+            <div class="text-slate-400 text-sm">Gültig bis</div>
+            <div class="font-semibold">{{ offer.due_date|date:"d.m.Y" }}</div>
+        </div>
+    </div>
+</div>
+
+
+<!-- SNAPSHOT: KONTAKT & ADRESSE -->
+<div class="mb-8 p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+
+    <h2 class="text-xl font-bold mb-6">Angebotsadresse</h2>
+
+    <div class="grid grid-cols-1 sm:grid-cols-2 gap-6">
+
+        <!-- Kontakt -->
+        <div>
+            <div class="text-slate-400 text-sm">Ansprechpartner</div>
+            <div class="font-semibold">{{ offer.contact_name|default:"-" }}</div>
+
+            {% if offer.contact_email %}
+                <div class="text-slate-400 text-sm">{{ offer.contact_email }}</div>
+            {% endif %}
+
+            {% if offer.contact_phone %}
+                <div class="text-slate-400 text-sm">{{ offer.contact_phone }}</div>
+            {% endif %}
+        </div>
+
+        <!-- Adresse -->
+        <div>
+            <div class="text-slate-400 text-sm">Standort</div>
+
+            <div class="font-semibold">
+                {{ offer.location_name|default:"-" }}
+            </div>
+
+            <div class="text-slate-400 text-sm">
+                {{ offer.location_street }}
+            </div>
+
+            <div class="text-slate-400 text-sm">
+                {{ offer.location_zip }} {{ offer.location_city }}
+            </div>
+
+            <div class="text-slate-400 text-sm">
+                {{ offer.location_country }}
+            </div>
+        </div>
+
+    </div>
+</div>
+
+
+<div class="mb-8 p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+    <h2 class="text-xl font-bold mb-6">Angebotshinweis</h2>
+    <div class="grid grid-cols-1 gap-6">
+        <div>
+            <div class="font-semibold">{{ offer.note|default:"-" }}</div>
+        </div>
+    </div>
+</div>
+
+
+<!-- POSITIONEN -->
+<div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+
+    <h2 class="text-xl font-bold mb-6">Positionen</h2>
+    <div class="overflow-x-auto rounded-xl">
+        {% render_table table %}
+    </div>
+
+
+    <div class="mt-4 text-right font-bold">
+        Gesamt: {{ total_net|floatformat:2 }} €
+    </div>
+
+</div>
+<script>
+function startDownloadAndRedirect() {
+    setTimeout(function() {
+        window.location.href = "{% url 'invoices:offers_detail' offer.id %}";
+    }, 1000);
+}
+</script>
+{% endblock %}

invoices/templates/invoices/offers/item_add.html

@@ -0,0 +1,197 @@
+{% extends "base.html" %}
+
+{% block title %}
+Rechnungswesen - Rechnungen
+{% endblock %}
+
+{% block header_title %}
+Rechnungsposition hinzufügen
+{% endblock %}
+
+{% block header_description %}
+Neue Rechnungsposition anlegen
+{% endblock %}
+
+{% block content %}
+
+<div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+
+    <form method="post" enctype="multipart/form-data" class="space-y-4">
+        {% csrf_token %}
+
+        {{ form.as_p }}
+
+        <button class="btn btn-save">
+            Speichern
+        </button>
+
+    </form>
+
+</div>
+
+
+<script>
+document.addEventListener("DOMContentLoaded", function () {
+
+    const source = document.getElementById("id_source_type");
+
+    const fields = {
+        item: document.getElementById("id_item"),
+        time: document.getElementById("id_time_entry"),
+        expense: document.getElementById("id_expense"),
+    };
+
+
+    function toggleFields() {
+
+        const value = source.value;
+
+
+        Object.keys(fields).forEach(key => {
+
+            const field = fields[key];
+
+            if (!field) {
+                return;
+            }
+
+
+            const row = field.closest("p");
+
+
+            if (key === value) {
+
+                row.style.display = "";
+
+            } else {
+
+                row.style.display = "none";
+
+                field.value = "";
+
+            }
+
+        });
+
+    }
+
+
+    source.addEventListener(
+        "change",
+        toggleFields
+    );
+
+
+    // Initial ausführen
+    toggleFields();
+
+});
+</script>
+
+<script>
+
+document.addEventListener("DOMContentLoaded", function () {
+
+
+const source = document.getElementById("id_source_type");
+
+
+const selects = {
+
+    item: document.getElementById("id_item"),
+
+    time: document.getElementById("id_time_entry"),
+
+    expense: document.getElementById("id_expense"),
+
+};
+
+
+const description = document.getElementById(
+    "id_description"
+);
+
+const quantity = document.getElementById(
+    "id_quantity"
+);
+
+const unit = document.getElementById(
+    "id_unit"
+);
+
+const price = document.getElementById(
+    "id_unit_price_net"
+);
+
+const tax = document.getElementById(
+    "id_unit_tax_rate"
+);
+
+
+
+function loadData(type, id){
+
+
+    if(!id){
+        return;
+    }
+
+
+    fetch(
+        `/invoices/ajax/invoice-item-data/?source=${type}&id=${id}`
+    )
+
+
+    .then(response => response.json())
+
+
+    .then(data => {
+
+
+        description.value = data.description;
+
+        quantity.value = data.quantity;
+
+        unit.value = data.unit;
+
+        price.value = data.unit_price_net;
+
+        tax.value = data.unit_tax_rate;
+
+
+    });
+
+
+}
+
+
+
+Object.keys(selects).forEach(type => {
+
+
+    if(selects[type]){
+
+
+        selects[type].addEventListener(
+            "change",
+            function(){
+
+                loadData(
+                    type,
+                    this.value
+                );
+
+            }
+        );
+
+
+    }
+
+
+});
+
+
+});
+
+</script>
+{% endblock %}

invoices/templates/invoices/offers/overview.html

@@ -0,0 +1,35 @@
+{% extends "base.html" %}
+
+{% block title %}Rechnungswesen - Angebote{% endblock %}
+
+{% block header_title %}Angebote{% endblock %}
+{% block header_description %}Angebote erstellen und verwalten{% endblock %}
+
+{% block content %}
+{% load django_tables2 %}
+<div class="mb-8">
+    <div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+        <div class="flex flex-col sm:flex-row sm:justify-between sm:items-center gap-4">
+            <div>
+                <h2 class="text-xl font-bold">Aktionen</h2>
+                <p class="text-slate-400 text-sm mt-1">Neues Angebot erstellen</p>
+            </div>
+
+            <div class="flex flex-col sm:flex-row gap-2">
+                <a href="{% url 'invoices:invoices_offers_add' %}" class="btn btn-add">+ Angebot</a>
+            </div>
+            
+        </div>
+    </div>
+</div>
+<div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+    <div class="mb-6">
+        <h2 class="text-xl font-bold">Angebote</h2>
+        <p class="text-slate-400 text-sm mt-1">Alle Angebote mit aktuellem Status</p>
+    </div>
+    <div class="overflow-x-auto rounded-xl">
+        {% render_table table %}
+    </div>
+</div>
+
+{% endblock %}

invoices/templates/invoices/offers/pdf.html

@@ -0,0 +1,732 @@
+<!DOCTYPE html>
+<html lang="de">
+
+<head>
+
+<meta charset="UTF-8">
+
+<style>
+
+@page {
+    size: A4;
+    margin: 18mm;
+}
+
+
+body {
+    font-family: Arial, sans-serif;
+    font-size: 11px;
+    color: #334155;
+}
+
+
+h1,h2,h3,p {
+    margin:0;
+}
+
+
+table {
+    width:100%;
+    border-collapse:collapse;
+}
+
+
+
+.header {
+    display:flex;
+    justify-content:space-between;
+}
+
+
+.logo {
+    height:128px;
+    margin-bottom:15px;
+}
+
+
+.company-name {
+    font-size:24px;
+    font-weight:bold;
+}
+
+
+.invoice-title {
+    font-size:32px;
+    font-weight:bold;
+}
+
+
+
+.info-table td {
+    padding:4px 0;
+}
+
+
+.label {
+    color:#64748b;
+    padding-right:30px;
+}
+
+
+
+
+.divider {
+    border-top:1px solid #e2e8f0;
+    margin:30px 0;
+}
+
+
+
+
+.receiver-title {
+    font-size:10px;
+    text-transform:uppercase;
+    color:#64748b;
+    letter-spacing:1px;
+}
+
+
+.receiver-name {
+    font-size:16px;
+    font-weight:bold;
+    margin-top:5px;
+}
+
+
+
+
+
+.invoice-heading {
+    font-size:22px;
+    font-weight:bold;
+    margin-bottom:10px;
+}
+
+
+
+
+.items-wrapper {
+    border:1px solid #e2e8f0;
+    border-radius:10px;
+    overflow:hidden;
+    margin-top:20px;
+}
+
+
+.items {
+    width:100%;
+    border-collapse:collapse;
+}
+
+
+.items thead th:first-child {
+    border-top-left-radius:10px;
+}
+
+
+.items thead th:last-child {
+    border-top-right-radius:10px;
+}
+
+
+.items th {
+    background:{{ company.color }};
+    color:white;
+    padding:10px;
+    text-align:left;
+}
+
+
+.items td {
+    padding:10px;
+    border-bottom:1px solid #e2e8f0;
+}
+
+
+.items tbody tr:last-child td {
+    border-bottom:none;
+}
+
+
+.right {
+    text-align:right;
+}
+
+
+
+.total-box {
+
+    margin-top:30px;
+    margin-left:auto;
+    width:250px;
+
+}
+
+
+.total-row {
+
+    display:flex;
+    justify-content:space-between;
+    padding:6px 0;
+
+}
+
+
+
+.total-final {
+
+    border-top:1px solid #cbd5e1;
+    margin-top:10px;
+    padding-top:10px;
+    font-size:16px;
+    font-weight:bold;
+
+}
+
+
+
+
+.note {
+    margin-top:30px;
+    padding:12px;
+    border:1px solid #e2e8f0;
+    border-radius: 10px;
+}
+
+
+
+.small-business {
+
+    margin-top:25px;
+    color:#64748b;
+
+}
+
+
+
+@page {
+    size: A4;
+    margin: 18mm 18mm 35mm 18mm;
+}
+
+
+.footer {
+    position: fixed;
+    bottom: -25mm;
+    left: 0;
+    right: 0;
+
+    padding-top:15px;
+    border-top:1px solid #e2e8f0;
+
+    display:flex;
+    justify-content:space-between;
+
+    font-size:10px;
+    color:#64748b;
+}
+
+
+.footer-title {
+    font-weight:bold;
+    color:#334155;
+    margin-bottom:5px;
+}
+
+
+</style>
+
+</head>
+
+
+<body>
+
+
+<!-- HEADER -->
+
+
+<div class="header">
+
+
+<div>
+
+            {% if company.logo %}
+                <img src="{{ company.logo.url }}" class="logo">
+            {% else %}
+                <h1 class="company-name" style="color: {{ company.color }}">
+                    {{ company.companyname }}
+                </h1>
+
+                {% if company.slogan %}
+                    <p>
+                        {{ company.slogan }}
+                    </p>
+                {% endif %}
+            {% endif %}
+
+
+
+<p style="margin-top:15px">
+{{ company.name }}<br>
+{{ company.street }} · {{ company.zip }} {{ company.city }}
+</p>
+
+
+</div>
+
+
+
+<div style="text-align:right">
+
+
+<div class="invoice-title">
+ANGEBOT
+</div>
+
+
+<table class="info-table">
+
+
+<tr>
+<td class="label">
+Angebotsnummer
+</td>
+
+<td>
+{{ offer.offer_number }}
+</td>
+</tr>
+
+
+<tr>
+<td class="label">
+Angebotsdatum
+</td>
+
+<td>
+{{ offer.issue_date|date:"d.m.Y" }}
+</td>
+</tr>
+
+
+
+{% if offer.due_date %}
+
+<tr>
+
+<td class="label">
+Gültig bis
+</td>
+
+<td>
+{{ offer.due_date|date:"d.m.Y" }}
+</td>
+
+</tr>
+
+{% endif %}
+
+
+</table>
+
+
+</div>
+
+
+</div>
+
+
+
+<div class="divider"></div>
+
+
+
+
+<!-- EMPFÄNGER -->
+
+
+<div>
+
+
+<div class="receiver-title">
+Angebotsempfänger
+</div>
+
+
+
+<div class="receiver-name">
+
+{% if offer.customer.type == "company" %}
+{{ offer.customer.company_name }}
+{% else %}
+{{ offer.contact_name }}
+{% endif %}
+
+</div>
+
+
+{% if offer.customer.type == "company" %}
+
+<p>
+z.Hd. {{ offer.contact_name }}
+</p>
+
+{% endif %}
+
+
+<p style="margin-top:10px">
+
+{{ offer.location_street }}<br>
+
+{{ offer.location_zip }}
+{{ offer.location_city }}
+
+</p>
+
+
+</div>
+
+
+
+
+
+<!-- TITEL -->
+
+
+<div style="margin-top:40px">
+
+
+<div class="invoice-heading"
+style="color:{{ company.color }}">
+
+Angebot
+
+</div>
+
+
+{% if company.offer_header_text %}
+
+<p>
+{{ company.offer_header_text|linebreaksbr }}
+</p>
+
+{% endif %}
+
+
+</div>
+
+
+
+
+
+<!-- POSITIONEN -->
+
+<div class="items-wrapper">
+<table class="items">
+
+
+<thead>
+
+<tr>
+
+<th>
+Nr.
+</th>
+
+<th>
+Beschreibung
+</th>
+
+<th class="left">
+Menge
+</th>
+
+<th class="left">
+Einheit
+</th>
+
+<th class="left">
+Preis
+</th>
+
+
+{% if not company.is_small_business %}
+
+<th class="left">
+Steuer
+</th>
+
+{% endif %}
+
+
+<th class="left">
+Gesamt
+</th>
+
+
+</tr>
+
+</thead>
+
+
+
+<tbody>
+
+
+{% for item in items %}
+
+<tr>
+
+
+<td>
+{{ forloop.counter }}
+</td>
+
+
+<td>
+{{ item.description }}
+</td>
+
+
+<td class="left">
+{{ item.quantity }}
+</td>
+
+
+<td class="left">
+{{ item.unit }}
+</td>
+
+
+<td class="left">
+{{ item.unit_price_net|floatformat:2 }} €
+</td>
+
+
+{% if not company.is_small_business %}
+
+<td class="left">
+{{ item.unit_tax_rate|floatformat:0 }} %
+</td>
+
+{% endif %}
+
+
+
+<td class="left">
+{{ item.calculated_total_net|floatformat:2 }} €
+</td>
+
+
+
+</tr>
+
+
+{% endfor %}
+
+
+</tbody>
+
+
+</table>
+</div>
+
+
+
+
+<!-- SUMMEN -->
+
+
+<div class="total-box">
+
+
+<div class="total-row">
+
+<span>
+Netto
+</span>
+
+<span>
+{{ total_net|floatformat:2 }} €
+</span>
+
+</div>
+
+
+
+{% if not company.is_small_business %}
+{% for tax_rate,tax_amount in tax_summary.items %}
+
+<div class="total-row">
+
+<span>
+Umsatzsteuer {{ tax_rate|floatformat:0 }} %
+</span>
+
+
+<span>
+{{ tax_amount|floatformat:2 }} €
+</span>
+
+
+</div>
+
+
+{% endfor %}
+
+{% endif %}
+
+
+
+
+<div class="total-row total-final">
+
+<span>
+Gesamt
+</span>
+
+
+<span>
+
+{% if company.is_small_business %}
+{{ total_net|floatformat:2 }}
+{% else %}
+{{ total_gross|floatformat:2 }}
+{% endif %}
+
+€
+
+</span>
+
+
+</div>
+
+
+</div>
+
+
+
+
+
+{% if offer.note %}
+
+<div class="note">
+
+<div class="receiver-title">
+Angebotshinweis
+</div>
+
+<br>
+
+{{ offer.note|linebreaksbr }}
+
+</div>
+
+{% endif %}
+
+
+
+
+
+
+{% if company.is_small_business %}
+
+<div class="note">
+
+    <div class="receiver-title">
+        Kleinunternehmerhinweis
+    </div>
+    <br>
+    {{ company.small_business_text }}
+</div>
+
+{% endif %}
+
+
+
+
+
+<!-- FOOTER -->
+
+
+<div class="footer">
+
+
+<div>
+
+<div class="footer-title">
+Kontakt
+</div>
+
+{% if company.phone %}
+{{ company.phone }}<br>
+{% endif %}
+
+{% if company.email %}
+{{ company.email }}<br>
+{% endif %}
+
+{% if company.website %}
+{{ company.website }}
+{% endif %}
+
+</div>
+
+
+
+
+<div>
+
+<div class="footer-title">
+Steuern
+</div>
+
+
+{% if company.tax_number %}
+Steuernummer: {{ company.tax_number }}<br>
+{% endif %}
+
+
+{% if company.vat_number %}
+USt-IdNr.: {{ company.vat_number }}
+{% endif %}
+
+
+</div>
+
+
+
+
+
+<div>
+
+<div class="footer-title">
+Bank
+</div>
+
+
+{% if company.bank_name %}
+{{ company.bank_name }}<br>
+{% endif %}
+
+
+{% if company.iban %}
+IBAN: {{ company.iban }}<br>
+{% endif %}
+
+
+{% if company.bic %}
+BIC: {{ company.bic }}
+{% endif %}
+
+
+</div>
+
+
+</div>
+
+
+
+</body>
+
+</html>

invoices/templates/invoices/offers/preview.html

@@ -0,0 +1,450 @@
+{% extends "base.html" %}
+
+{% block title %}Rechnungswesen - Angebote{% endblock %}
+
+{% block header_title %}Angebot {{ offer.offer_number }}{% endblock %}
+
+{% block header_description %}Vorschau{% endblock %}
+
+{% block content %}
+
+<div class="w-5xl max-w-5xl mx-auto bg-white rounded-2xl shadow p-10 text-slate-900">
+
+    <!-- HEADER -->
+    <div class="flex justify-between items-start">
+
+        <div>
+            {% if company.logo %}
+                <img src="{{ company.logo.url }}" class="h-32 mb-4">
+            {% else %}
+                <h1 class="text-2xl font-bold" style="color: {{ company.color }}">
+                    {{ company.companyname }}
+                </h1>
+
+                {% if company.slogan %}
+                    <p class="text-sm text-slate-600 mt-1">
+                        {{ company.slogan }}
+                    </p>
+                {% endif %}
+            {% endif %}
+
+            
+
+            <div class="mt-4 text-sm">
+                <p>{{ company.name }}</p>
+                <p>
+                    {{ company.street }}
+                    ·
+                    {{ company.zip }}
+                    {{ company.city }}
+                </p>
+            </div>
+        </div>
+
+
+        <div class="text-right">
+
+            <h2 class="text-3xl font-bold ">
+                ANGEBOT
+            </h2>
+
+
+            <table class="mt-4 text-sm ml-auto">
+
+                <tr>
+                    <td class="text-slate-600 pr-8 py-1">
+                        Angebotsnummer
+                    </td>
+                    <td class="font-medium">
+                        {{ offer.offer_number }}
+                    </td>
+                </tr>
+
+                <tr>
+                    <td class="text-slate-600 pr-8 py-1">
+                        Angebotsdatum
+                    </td>
+                    <td class="font-medium">
+                        {{ offer.issue_date|date:"d.m.Y" }}
+                    </td>
+                </tr>
+
+
+                {% if offer.due_date %}
+                <tr>
+                    <td class="text-slate-600 pr-8 py-1">
+                        Gültig bis
+                    </td>
+                    <td class="font-medium">
+                        {{ offer.due_date|date:"d.m.Y" }}
+                    </td>
+                </tr>
+                {% endif %}
+
+            </table>
+
+        </div>
+
+    </div>
+
+
+    <div class="my-8 border-t"></div>
+
+
+    <!-- EMPFÄNGER -->
+
+    <div class="mb-10">
+
+        <p class="text-xs uppercase tracking-wide text-slate-600 mb-2">
+            Angebotsempfänger
+        </p>
+
+        <p class="font-semibold text-lg ">
+
+            {% if offer.customer.type == "company" %}
+                {{ offer.customer.company_name }}
+            {% else %}
+                {{ offer.contact_name }}
+            {% endif %}
+
+        </p>
+
+
+        {% if offer.customer.type == "company" %}
+            <p class="text-sm">
+                z.Hd. {{ offer.contact_name }}
+            </p>
+        {% endif %}
+
+
+        <p class="mt-2 text-sm">
+            {{ offer.location_street }}<br>
+            {{ offer.location_zip }}
+            {{ offer.location_city }}
+        </p>
+
+    </div>
+
+
+
+    <!-- TITEL -->
+
+    <div class="mb-8">
+
+        <h2 class="text-2xl font-bold" style="color: {{ company.color }}">
+            Angebot
+        </h2>
+
+
+        {% if company.offer_header_text %}
+        <div class="mt-3 text-sm text-slate-600">
+            {{ company.offer_header_text|linebreaks }}
+        </div>
+        {% endif %}
+
+    </div>
+
+
+
+    <!-- POSITIONEN -->
+
+    <div class="border rounded-xl overflow-hidden">
+
+        <table class="w-full text-sm">
+
+            <thead>
+
+                <tr style="background-color: {{ company.color }}" class="text-white">
+
+                    <th class="p-3 text-left">
+                        Nr.
+                    </th>
+
+                    <th class="p-3 text-left">
+                        Beschreibung
+                    </th>
+
+                    <th class="p-3 text-right">
+                        Menge
+                    </th>
+
+                    <th class="p-3 text-right">
+                        Einheit
+                    </th>
+
+                    <th class="p-3 text-right">
+                        Preis
+                    </th>
+
+
+                    {% if not company.is_small_business %}
+                    <th class="p-3 text-right">
+                        Steuer
+                    </th>
+                    {% endif %}
+
+
+                    <th class="p-3 text-right">
+                        Gesamt
+                    </th>
+
+                </tr>
+
+            </thead>
+
+
+            <tbody>
+
+            {% for item in items %}
+
+                <tr class="border-t">
+
+                    <td class="p-3 text-left">
+                        {{ forloop.counter }}
+                    </td>
+
+                    <td class="p-3 text-left">
+                        {{ item.description }}
+                    </td>
+
+                    <td class="p-3 text-right">
+                        {{ item.quantity }}
+                    </td>
+
+                    <td class="p-3 text-right">
+                        {{ item.unit }}
+                    </td>
+
+                    <td class="p-3 text-right">
+                        {{ item.unit_price_net|floatformat:2 }} €
+                    </td>
+
+
+                    {% if not company.is_small_business %}
+                    <td class="p-3 text-right">
+                        {{ item.unit_tax_rate|floatformat:0 }} %
+                    </td>
+                    {% endif %}
+
+
+                    <td class="p-3 text-right font-medium">
+                        {{ item.calculated_total_net|floatformat:2 }} €
+                    </td>
+
+                </tr>
+
+            {% endfor %}
+
+            </tbody>
+
+        </table>
+
+    </div>
+
+    <!-- SUMMEN -->
+
+    <div class="flex justify-end mt-8">
+
+        <div class="w-80 text-sm">
+
+            <div class="flex justify-between py-2">
+                <span class="text-slate-600">
+                    Netto
+                </span>
+
+                <span>
+                    {{ total_net|floatformat:2 }} €
+                </span>
+            </div>
+
+
+            {% if not company.is_small_business %}
+
+                {% for tax_rate, tax_amount in tax_summary.items %}
+
+                <div class="flex justify-between py-2">
+
+                    <span class="text-slate-600">
+                        Umsatzsteuer {{ tax_rate|floatformat:0 }} %
+                    </span>
+
+                    <span>
+                        {{ tax_amount|floatformat:2 }} €
+                    </span>
+
+                </div>
+
+                {% endfor %}
+
+            {% endif %}
+
+
+
+            <div class="border-t mt-3 pt-4 flex justify-between text-lg font-bold ">
+
+                <span>
+                    Gesamt
+                </span>
+
+                <span>
+                    {% if company.is_small_business %}
+                        {{ total_net|floatformat:2 }} €
+                    {% else %}
+                        {{ total_gross|floatformat:2 }} €
+                    {% endif %}
+                    
+                </span>
+
+            </div>
+
+        </div>
+
+    </div>
+
+
+
+
+
+    <!-- NOTIZ -->
+
+    {% if offer.note %}
+
+    <div class="mt-10 border rounded-xl p-4">
+
+        <p class="text-xs uppercase tracking-wide text-slate-600 mb-2">
+            Angebotshinweis
+        </p>
+
+
+        <div class="text-sm">
+            {{ offer.note|linebreaks }}
+        </div>
+
+    </div>
+
+    {% endif %}
+
+
+
+
+<!-- KLEINUNTERNEHMER -->
+{% if company.is_small_business %}
+
+<div class="mt-10 border rounded-xl p-4">
+
+    <p class="text-xs uppercase tracking-wide text-slate-600 mb-2">
+        Kleinunternehmerhinweis
+    </p>
+    <div class="text-sm">
+    {{ company.small_business_text }}
+    </div>
+</div>
+
+{% endif %}
+
+
+
+
+    <!-- FOOTER -->
+
+    <div class="mt-14 pt-6 border-t grid grid-cols-3 gap-6 text-xs text-slate-600">
+
+
+        <!-- KONTAKT -->
+
+        <div>
+
+            <p class="font-semibold  mb-2">
+                Kontakt
+            </p>
+
+
+            {% if company.phone %}
+                <p>{{ company.phone }}</p>
+            {% endif %}
+
+
+            {% if company.email %}
+                <p>{{ company.email }}</p>
+            {% endif %}
+
+
+            {% if company.website %}
+                <p>{{ company.website }}</p>
+            {% endif %}
+
+        </div>
+
+
+
+
+        <!-- STEUERN -->
+
+        <div>
+
+            <p class="font-semibold  mb-2">
+                Steuern
+            </p>
+
+
+            {% if company.tax_number %}
+                <p>
+                    Steuernummer:
+                    {{ company.tax_number }}
+                </p>
+            {% endif %}
+
+
+            {% if company.vat_number %}
+                <p>
+                    USt-IdNr.:
+                    {{ company.vat_number }}
+                </p>
+            {% endif %}
+
+        </div>
+
+
+
+
+
+        <!-- BANK -->
+
+        <div>
+
+            <p class="font-semibold  mb-2">
+                Bankverbindung
+            </p>
+
+
+            {% if company.bank_name %}
+                <p>
+                    {{ company.bank_name }}
+                </p>
+            {% endif %}
+
+
+            {% if company.iban %}
+                <p>
+                    IBAN:
+                    {{ company.iban }}
+                </p>
+            {% endif %}
+
+
+            {% if company.bic %}
+                <p>
+                    BIC:
+                    {{ company.bic }}
+                </p>
+            {% endif %}
+
+        </div>
+
+
+    </div>
+
+
+</div>
+
+{% endblock %}

invoices/templates/invoices/overview.html

@@ -0,0 +1,61 @@
+{% extends "base.html" %}
+
+{% block title %}
+Rechnungswesen
+{% endblock %}
+
+
+{% block header_title %}
+Rechnungswesen
+{% endblock %}
+
+{% block header_description %}
+Angebote, Rechnungen, Mahnungen verwalten
+{% endblock %}
+
+{% block content %}
+
+<!-- MODULE GRID -->
+<div class="grid grid-cols-1 md:grid-cols-3 gap-4">
+
+    <a href="{% url 'invoices:invoices_offers_overview' %}" class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+        <div class="text-2xl mb-2">📄</div>
+        <h2 class="text-xl font-bold">Angebote</h2>
+        <p class="text-slate-400 text-sm mt-1">Angebote erstellen und verwalten</p>
+    </a>
+    <a href="{% url 'invoices:invoices_invoices_overview' %}" class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+        <div class="text-2xl mb-2">🧾</div>
+        <h2 class="text-xl font-bold">Rechnungen</h2>
+        <p class="text-slate-400 text-sm mt-1">Rechnungen erstellen und verwalten</p>
+    </a>
+    <a href="{% url 'invoices:invoices_reminders_overview' %}" class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+        <div class="text-2xl mb-2">⚠️</div>
+        <h2 class="text-xl font-bold">Mahnungen</h2>
+        <p class="text-slate-400 text-sm mt-1">Offene Forderungen verfolgen</p>
+    </a>
+    <a href="{% url 'invoices:customers_overview' %}" class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+        <div class="text-2xl mb-2">👥</div>
+        <h2 class="text-xl font-bold">Kunden</h2>
+        <p class="text-slate-400 text-sm mt-1">Kundenstammdaten verwalten</p>
+    </a>
+    <a href="{% url 'invoices:items_overview' %}" class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+        <div class="text-2xl mb-2">📦</div>
+        <h2 class="text-xl font-bold">Posten</h2>
+        <p class="text-slate-400 text-sm mt-1">Leistungen und Artikel verwalten</p>
+    </a>
+</div>
+
+<!-- OPTIONAL INFO BOX -->
+<div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors mt-8">
+
+    <h2 class="text-xl font-bold">
+        Zusammenfassung
+    </h2>
+
+    <p class="text-slate-400 text-sm mt-1">
+        folgt
+    </p>
+
+</div>
+
+{% endblock %}

invoices/templates/invoices/reminders/add.html

@@ -0,0 +1,31 @@
+{% extends "base.html" %}
+
+{% block title %}Rechnungswesen - Mahnungen{% endblock %}
+
+{% block header_title %}
+Mahnung erstellen
+{% endblock %}
+
+{% block header_description %}
+Mahnung für einen Kunden erstellen
+{% endblock %}
+
+{% block content %}
+
+
+
+<div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+
+    <form method="post" enctype="multipart/form-data" class="space-y-4">
+        {% csrf_token %}
+
+        {{ form.as_p }}
+
+        <button class="btn btn-save">
+            Speichern
+        </button>
+
+    </form>
+
+</div>
+{% endblock %}

invoices/templates/invoices/reminders/detail.html

@@ -0,0 +1,184 @@
+{% extends "base.html" %}
+
+{% block title %}Rechnungswesen - Mahnungen{% endblock %}
+
+{% block header_title %}
+Mahnung {{ reminder.reminder_number }}
+{% endblock %}
+
+{% block header_description %}
+Details
+{% endblock %}
+
+{% block content %}
+<div class="mb-8">
+    <div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+        <div class="flex flex-col sm:flex-row sm:justify-between sm:items-center gap-4">
+            <div>
+                <h2 class="text-xl font-bold">Aktionen</h2>
+                <p class="text-slate-400 text-sm mt-1">
+                    Mahnung verwalten
+                </p>
+            </div>
+            <div class="flex flex-col sm:flex-row gap-2">
+                {% if reminder.status == "draft" %}
+                    <a href="{% url 'invoices:reminders_download' reminder.id %}" onclick="startDownloadAndRedirect()" class="btn btn-action">Download</a>
+                    <a href="{% url 'invoices:reminders_delete' reminder.id %}" class="btn btn-delete">Löschen</a>
+                {% endif %}
+                {% if reminder.status == "sent" %}
+                    <a href="{% url 'invoices:reminders_download' reminder.id %}" class="btn btn-action">Download</a>
+                    <a href="{% url 'invoices:reminders_cancel' reminder.id %}" class="btn btn-delete">Stornieren</a>
+                    <a href="{% url 'invoices:reminders_paid' reminder.id %}" class="btn btn-action">Zahlung verbuchen</a>
+                    <a href="{% url 'invoices:reminders_expire' reminder.id %}" class="btn btn-action">Überfällig</a>
+                {% endif %}
+                {% if reminder.status == "paid" or reminder.status == "canceled" or reminder.status == "expired" %}
+                    <a href="{% url 'invoices:reminders_download' reminder.id %}" class="btn btn-action">Download</a>
+                {% endif %}
+            </div>
+            
+        </div>
+    </div>
+</div>
+
+<!-- HEADER INFO -->
+<div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors mb-8">
+
+    <h2 class="text-xl font-bold mb-6">Allgemein</h2>
+
+    <div class="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-6">
+        <!-- Status -->
+        <div>
+            <div class="text-slate-400 text-sm">Status</div>
+            <div class="font-semibold">{{ reminder.get_status_display }}</div>
+        </div>
+
+        <div>
+            <div class="text-slate-400 text-sm">Level</div>
+            <div class="font-semibold">{{ reminder.level }}/3</div>
+        </div>
+
+        <!-- Datum -->
+        <div>
+            <div class="text-slate-400 text-sm">Mahnungsdatum</div>
+            <div class="font-semibold">{{ reminder.issue_date|date:"d.m.Y" }}</div>
+        </div>
+
+        <div>
+            <div class="text-slate-400 text-sm">Neues Zahlungsziel</div>
+            <div class="font-semibold">{{ reminder.due_date|date:"d.m.Y" }}</div>
+        </div>
+
+        <div>
+            <div class="text-slate-400 text-sm">Mahngebühr</div>
+            <div class="font-semibold">{{ reminder.fee }} €</div>
+        </div>
+    </div>
+</div>
+
+
+<!-- HEADER INFO -->
+<div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors mb-8">
+
+    <h2 class="text-xl font-bold mb-6">Rechnungsinformationen</h2>
+
+    <div class="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-6">
+        <div>
+            <div class="text-slate-400 text-sm">Rechnungsnummer</div>
+            <div class="font-semibold"><a class="company_link" href="{% url 'invoices:invoices_detail' reminder.invoice.id %}">{{ reminder.invoice.invoice_number }}</a></div>
+        </div>
+
+        <!-- Kunde -->
+        <div>
+            <div class="text-slate-400 text-sm">Kunde</div>
+            <div class="font-semibold">{{ reminder.invoice.customer.company_name }}</div>
+        </div>
+
+        <div>
+            <div class="text-slate-400 text-sm">Projekt</div>
+            <div class="font-semibold">{{ reminder.invoice.project.name|default:"-" }}</div>
+        </div>
+
+        <!-- Status -->
+        <div>
+            <div class="text-slate-400 text-sm">Rechnungsstatus</div>
+            <div class="font-semibold">{{ reminder.invoice.get_status_display }}</div>
+        </div>
+
+        <!-- Datum -->
+        <div>
+            <div class="text-slate-400 text-sm">Rechnungsdatum</div>
+            <div class="font-semibold">{{ reminder.invoice.issue_date|date:"d.m.Y" }}</div>
+        </div>
+
+        <div>
+            <div class="text-slate-400 text-sm">Ursprüngliches Zahlungsziel</div>
+            <div class="font-semibold">{{ reminder.invoice.due_date|date:"d.m.Y" }}</div>
+        </div>
+    </div>
+</div>
+
+
+<!-- SNAPSHOT: KONTAKT & ADRESSE -->
+<div class="mb-8 p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+
+    <h2 class="text-xl font-bold mb-6">Mahnungsadresse</h2>
+
+    <div class="grid grid-cols-1 sm:grid-cols-2 gap-6">
+
+        <!-- Kontakt -->
+        <div>
+            <div class="text-slate-400 text-sm">Ansprechpartner</div>
+            <div class="font-semibold">{{ reminder.invoice.contact_name|default:"-" }}</div>
+
+            {% if reminder.invoice.contact_email %}
+                <div class="text-slate-400 text-sm">{{ reminder.invoice.contact_email }}</div>
+            {% endif %}
+
+            {% if reminder.invoice.contact_phone %}
+                <div class="text-slate-400 text-sm">{{ reminder.invoice.contact_phone }}</div>
+            {% endif %}
+        </div>
+
+        <!-- Adresse -->
+        <div>
+            <div class="text-slate-400 text-sm">Standort</div>
+
+            <div class="font-semibold">
+                {{ reminder.invoice.location_name|default:"-" }}
+            </div>
+
+            <div class="text-slate-400 text-sm">
+                {{ reminder.invoice.location_street }}
+            </div>
+
+            <div class="text-slate-400 text-sm">
+                {{ reminder.invoice.location_zip }} {{ reminder.invoice.location_city }}
+            </div>
+
+            <div class="text-slate-400 text-sm">
+                {{ reminder.invoice.location_country }}
+            </div>
+        </div>
+
+    </div>
+</div>
+
+
+<div class="mb-8 p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+    <h2 class="text-xl font-bold mb-6">Mahnungshinweis</h2>
+    <div class="grid grid-cols-1 gap-6">
+        <div>
+            <div class="font-semibold">{{ reminder.note|default:"-" }}</div>
+        </div>
+    </div>
+</div>
+
+
+<script>
+function startDownloadAndRedirect() {
+    setTimeout(function() {
+        window.location.href = "{% url 'invoices:reminders_detail' reminder.id %}";
+    }, 1000);
+}
+</script>
+{% endblock %}

invoices/templates/invoices/reminders/overview.html

@@ -0,0 +1,35 @@
+{% extends "base.html" %}
+
+{% block title %}Rechnungswesen - Mahnungen{% endblock %}
+
+{% block header_title %}Mahnungen{% endblock %}
+{% block header_description %}Offene Forderungen verfolgen{% endblock %}
+
+{% block content %}
+{% load django_tables2 %}
+<div class="mb-8">
+    <div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+        <div class="flex flex-col sm:flex-row sm:justify-between sm:items-center gap-4">
+            <div>
+                <h2 class="text-xl font-bold">Aktionen</h2>
+                <p class="text-slate-400 text-sm mt-1">Neue Mahnung erstellen</p>
+            </div>
+
+            <div class="flex flex-col sm:flex-row gap-2">
+                <a href="{% url 'invoices:invoices_reminders_add' %}" class="btn btn-add">+ Mahnung</a>
+            </div>
+            
+        </div>
+    </div>
+</div>
+<div class="p-6 rounded-xl shadow bg-white dark:bg-slate-800 text-slate-900 dark:text-white transition-colors">
+    <div class="mb-6">
+        <h2 class="text-xl font-bold">Mahnungen</h2>
+        <p class="text-slate-400 text-sm mt-1">Alle Mahnungen mit aktuellem Status</p>
+    </div>
+    <div class="overflow-x-auto rounded-xl">
+        {% render_table table %}
+    </div>
+</div>
+
+{% endblock %}

invoices/templates/invoices/reminders/pdf.html

@@ -0,0 +1,663 @@
+<!DOCTYPE html>
+<html lang="de">
+
+<head>
+
+<meta charset="UTF-8">
+
+<style>
+
+@page {
+    size: A4;
+    margin: 18mm;
+}
+
+
+body {
+    font-family: Arial, sans-serif;
+    font-size: 11px;
+    color: #334155;
+}
+
+
+h1,h2,h3,p {
+    margin:0;
+}
+
+
+table {
+    width:100%;
+    border-collapse:collapse;
+}
+
+
+
+.header {
+    display:flex;
+    justify-content:space-between;
+}
+
+
+.logo {
+    height:128px;
+    margin-bottom:15px;
+}
+
+
+.company-name {
+    font-size:24px;
+    font-weight:bold;
+}
+
+
+.invoice-title {
+    font-size:32px;
+    font-weight:bold;
+}
+
+
+
+.info-table td {
+    padding:4px 0;
+}
+
+
+.label {
+    color:#64748b;
+    padding-right:30px;
+}
+
+
+
+
+.divider {
+    border-top:1px solid #e2e8f0;
+    margin:30px 0;
+}
+
+
+
+
+.receiver-title {
+    font-size:10px;
+    text-transform:uppercase;
+    color:#64748b;
+    letter-spacing:1px;
+}
+
+
+.receiver-name {
+    font-size:16px;
+    font-weight:bold;
+    margin-top:5px;
+}
+
+
+
+
+
+.invoice-heading {
+    font-size:22px;
+    font-weight:bold;
+    margin-bottom:10px;
+}
+
+
+
+
+.items-wrapper {
+    border:1px solid #e2e8f0;
+    border-radius:10px;
+    overflow:hidden;
+    margin-top:20px;
+}
+
+
+.items {
+    width:100%;
+    border-collapse:collapse;
+}
+
+
+.items thead th:first-child {
+    border-top-left-radius:10px;
+}
+
+
+.items thead th:last-child {
+    border-top-right-radius:10px;
+}
+
+
+.items th {
+    background:{{ company.color }};
+    color:white;
+    padding:10px;
+    text-align:left;
+}
+
+
+.items td {
+    padding:10px;
+    border-bottom:1px solid #e2e8f0;
+}
+
+
+.items tbody tr:last-child td {
+    border-bottom:none;
+}
+
+
+.right {
+    text-align:right;
+}
+
+
+
+.total-box {
+
+    margin-top:30px;
+    margin-left:auto;
+    width:250px;
+
+}
+
+
+.total-row {
+
+    display:flex;
+    justify-content:space-between;
+    padding:6px 0;
+
+}
+
+
+
+.total-final {
+
+    border-top:1px solid #cbd5e1;
+    margin-top:10px;
+    padding-top:10px;
+    font-size:16px;
+    font-weight:bold;
+
+}
+
+
+
+
+.note {
+    margin-top:30px;
+    padding:12px;
+    border:1px solid #e2e8f0;
+    border-radius: 10px;
+}
+
+
+
+.small-business {
+
+    margin-top:25px;
+    color:#64748b;
+
+}
+
+
+
+@page {
+    size: A4;
+    margin: 18mm 18mm 35mm 18mm;
+}
+
+
+.footer {
+    position: fixed;
+    bottom: -25mm;
+    left: 0;
+    right: 0;
+
+    padding-top:15px;
+    border-top:1px solid #e2e8f0;
+
+    display:flex;
+    justify-content:space-between;
+
+    font-size:10px;
+    color:#64748b;
+}
+
+
+.footer-title {
+    font-weight:bold;
+    color:#334155;
+    margin-bottom:5px;
+}
+
+
+</style>
+
+</head>
+
+
+<body>
+
+
+<!-- HEADER -->
+
+
+<div class="header">
+
+
+<div>
+
+            {% if company.logo %}
+                <img src="{{ company.logo.url }}" class="logo">
+            {% else %}
+                <h1 class="company-name" style="color: {{ company.color }}">
+                    {{ company.companyname }}
+                </h1>
+
+                {% if company.slogan %}
+                    <p>
+                        {{ company.slogan }}
+                    </p>
+                {% endif %}
+            {% endif %}
+
+
+
+<p style="margin-top:15px">
+{{ company.name }}<br>
+{{ company.street }} · {{ company.zip }} {{ company.city }}
+</p>
+
+
+</div>
+
+
+
+<div style="text-align:right">
+
+
+<div class="invoice-title">
+MAHNUNG
+</div>
+
+
+<table class="info-table">
+    <tr>
+        <td class="label">Mahnungsnummer</td>
+        <td>{{ reminder.reminder_number }}</td>
+    </tr>
+
+    <tr>
+        <td class="label">Mahnungsdatum</td>
+        <td>{{ reminder.issue_date|date:"d.m.Y" }}</td>
+    </tr>
+
+    <tr>
+        <td class="label">Mahnungsstufe</td>
+        <td>{{ reminder.level }}. Mahnung</td>
+    </tr>
+
+    <tr>
+        <td class="label">Ursprüngliches Zahlungsziel</td>
+        <td>{{ reminder.invoice.due_date|date:"d.m.Y" }}</td>
+    </tr>
+
+    <tr>
+        <td class="label">Neues Zahlungsziel</td>
+        <td>{{ reminder.due_date|date:"d.m.Y" }}</td>
+    </tr>
+
+    <tr>
+        <td class="label">Rechnungsnummer</td>
+        <td>{{ reminder.invoice.invoice_number }}</td>
+    </tr>
+</table>
+
+
+</div>
+
+
+</div>
+
+
+
+<div class="divider"></div>
+
+
+
+
+<!-- EMPFÄNGER -->
+
+
+<div>
+
+
+<div class="receiver-title">
+Empfänger
+</div>
+
+
+
+<div class="receiver-name">
+
+{% if reminder.invoice.customer.type == "company" %}
+{{ reminder.invoice.customer.company_name }}
+{% else %}
+{{ reminder.invoice.contact_name }}
+{% endif %}
+
+</div>
+
+
+{% if reminder.invoice.customer.type == "company" %}
+
+<p>
+z.Hd. {{ reminder.invoice.contact_name }}
+</p>
+
+{% endif %}
+
+
+<p style="margin-top:10px">
+
+{{ reminder.invoice.location_street }}<br>
+
+{{ reminder.invoice.location_zip }}
+{{ reminder.invoice.location_city }}
+
+</p>
+
+
+</div>
+
+
+
+
+
+<!-- TITEL -->
+
+
+<div style="margin-top:40px">
+
+
+<div class="invoice-heading"
+style="color:{{ company.color }}">
+
+Mahnung
+
+</div>
+
+
+{% if company.reminder_header_text %}
+
+<p>
+{{ company.reminder_header_text|linebreaksbr }}
+</p>
+
+{% endif %}
+
+
+</div>
+
+
+
+
+<!-- FORDERUNGSÜBERSICHT -->
+
+
+<div class="items-wrapper">
+
+<table class="items">
+
+
+<thead>
+
+<tr>
+
+<th>
+Beschreibung
+</th>
+
+<th class="right">
+Betrag
+</th>
+
+</tr>
+
+</thead>
+
+
+
+<tbody>
+
+
+<tr>
+
+<td>
+Rechnung {{ reminder.invoice.invoice_number }}
+</td>
+
+<td>
+{{ invoice_amount|floatformat:2 }} €
+</td>
+
+</tr>
+
+
+
+{% if previous_reminders or reminder.fee > 0 %}
+
+{% for old_reminder in previous_reminders %}
+
+<tr>
+
+    <td>
+        {{ old_reminder.level }}. Mahnung
+        ({{ old_reminder.issue_date|date:"d.m.Y" }})
+    </td>
+
+    <td>
+        {{ old_reminder.fee|floatformat:2 }} €
+    </td>
+
+</tr>
+
+{% endfor %}
+
+
+<tr>
+
+    <td>
+        Aktuelle Mahngebühr
+    </td>
+
+    <td>
+        {{ reminder.fee|floatformat:2 }} €
+    </td>
+
+</tr>
+
+{% endif %}
+
+
+
+</tbody>
+
+
+</table>
+
+</div>
+
+
+
+
+<!-- GESAMTFORDERUNG -->
+
+
+<div class="total-box">
+
+
+<div class="total-row">
+
+<span>
+Offener Rechnungsbetrag
+</span>
+
+<span>
+{{ invoice_amount|floatformat:2 }} €
+</span>
+
+</div>
+
+
+
+{% if previous_reminders or reminder.fee > 0 %}
+
+<div class="total-row">
+
+<span>
+Mahngebühren
+</span>
+
+<span>
+{{ total_fees|floatformat:2 }} €
+</span>
+
+</div>
+
+{% endif %}
+
+
+
+<div class="total-row total-final">
+
+<span>
+Gesamtforderung
+</span>
+
+
+<span>
+{{ total_due|floatformat:2 }} €
+</span>
+
+
+</div>
+
+
+</div>
+
+
+
+
+
+
+{% if reminder.note %}
+
+<div class="note">
+
+<div class="receiver-title">
+Mahnungshinweis
+</div>
+
+<br>
+
+{{ reminder.note|linebreaksbr }}
+
+</div>
+
+{% endif %}
+
+
+
+
+
+
+
+
+<!-- FOOTER -->
+
+
+<div class="footer">
+
+
+<div>
+
+<div class="footer-title">
+Kontakt
+</div>
+
+{% if company.phone %}
+{{ company.phone }}<br>
+{% endif %}
+
+{% if company.email %}
+{{ company.email }}<br>
+{% endif %}
+
+{% if company.website %}
+{{ company.website }}
+{% endif %}
+
+</div>
+
+
+
+
+<div>
+
+<div class="footer-title">
+Steuern
+</div>
+
+
+{% if company.tax_number %}
+Steuernummer: {{ company.tax_number }}<br>
+{% endif %}
+
+
+{% if company.vat_number %}
+USt-IdNr.: {{ company.vat_number }}
+{% endif %}
+
+
+</div>
+
+
+
+
+
+<div>
+
+<div class="footer-title">
+Bank
+</div>
+
+
+{% if company.bank_name %}
+{{ company.bank_name }}<br>
+{% endif %}
+
+
+{% if company.iban %}
+IBAN: {{ company.iban }}<br>
+{% endif %}
+
+
+{% if company.bic %}
+BIC: {{ company.bic }}
+{% endif %}
+
+
+</div>
+
+
+</div>
+
+
+
+</body>
+
+</html>

invoices/templates/invoices/tables/customer/detail.html

@@ -0,0 +1,218 @@
+<div>
+
+
+    <div class="grid md:grid-cols-2 xl:grid-cols-3 gap-6">
+
+
+        <!-- Ansprechpartner -->
+
+        <div>
+
+            <h3 class="font-bold mb-3">
+                Ansprechpartner
+            </h3>
+
+
+            {% for contact in item.contacts.all %}
+
+                <div class="
+                    bg-slate-100
+                    dark:bg-slate-700
+                    rounded-xl
+                    p-3
+                    mb-2
+                ">
+
+                    <div class="font-medium">
+                        {{ contact.first_name }}
+                        {{ contact.last_name }}
+                    </div>
+
+
+                    {% if contact.phone %}
+
+                    <div class="text-sm text-slate-400">
+                        {{ contact.phone }}
+                    </div>
+
+                    {% endif %}
+
+
+                    {% if contact.email %}
+
+                    <div class="text-sm text-slate-400">
+                        {{ contact.email }}
+                    </div>
+
+                    {% endif %}
+
+                </div>
+
+
+            {% empty %}
+
+                <div class="
+                    bg-white
+                    dark:bg-slate-800
+                    border
+                    border-orange-500
+                    rounded-xl
+                    p-6
+                    text-orange-500
+                ">
+                    Keine Ansprechpartner vorhanden
+                </div>
+
+            {% endfor %}
+
+        </div>
+
+
+
+        <!-- Standorte -->
+
+        <div>
+
+            <h3 class="font-bold mb-3">
+                Standorte
+            </h3>
+
+
+            {% for location in item.locations.all %}
+
+                <div class="
+                    bg-slate-100
+                    dark:bg-slate-700
+                    rounded-xl
+                    p-3
+                    mb-2
+                ">
+
+                    <div class="font-medium">
+                        {{ location.name }}
+                    </div>
+
+
+                    <div class="text-sm text-slate-400">
+                        {{ location.street }}
+                    </div>
+
+
+                    <div class="text-sm text-slate-400">
+                        {{ location.zip_code }}
+                        {{ location.city }}
+                    </div>
+
+
+                    <div class="text-sm text-slate-400">
+                        {{ location.country }}
+                    </div>
+
+                </div>
+
+
+            {% empty %}
+
+                <div class="
+                    bg-white
+                    dark:bg-slate-800
+                    border
+                    border-orange-500
+                    rounded-xl
+                    p-6
+                    text-orange-500
+                ">
+                    Keine Standorte vorhanden
+                </div>
+
+            {% endfor %}
+
+        </div>
+
+
+
+        <!-- Projekte -->
+
+        <div>
+
+            <h3 class="font-bold mb-3">
+                Projekte
+            </h3>
+
+
+            {% for project in item.projects.all %}
+
+                <div class="
+                    bg-slate-100
+                    dark:bg-slate-700
+                    rounded-xl
+                    p-3
+                    mb-2
+                ">
+
+                    {{ project.name }}
+
+                </div>
+
+
+            {% empty %}
+
+                <div class="
+                    bg-white
+                    dark:bg-slate-800
+                    border
+                    border-orange-500
+                    rounded-xl
+                    p-6
+                    text-orange-500
+                ">
+                    Keine Projekte zugeordnet
+                </div>
+
+            {% endfor %}
+
+        </div>
+
+
+    </div>
+
+
+
+    <div class="mt-5 flex gap-2">
+
+
+        <a
+            href="{% url 'invoices:customers_detail' item.id %}"
+            class="btn btn-edit">
+
+            Bearbeiten
+
+        </a>
+
+
+
+        <form
+            method="post"
+            action="{% url 'invoices:customers_archive' item.id %}">
+
+            {% csrf_token %}
+
+
+            <button
+                type="submit"
+                name="archiv"
+                value="1"
+                class="btn btn-action">
+
+                Archivieren
+
+            </button>
+
+
+        </form>
+
+
+    </div>
+
+
+</div>

invoices/templates/invoices/tables/customer/detail_archived.html

@@ -0,0 +1,218 @@
+<div>
+
+
+    <div class="grid md:grid-cols-2 xl:grid-cols-3 gap-6">
+
+
+        <!-- Ansprechpartner -->
+
+        <div>
+
+            <h3 class="font-bold mb-3">
+                Ansprechpartner
+            </h3>
+
+
+            {% for contact in item.contacts.all %}
+
+                <div class="
+                    bg-slate-100
+                    dark:bg-slate-700
+                    rounded-xl
+                    p-3
+                    mb-2
+                ">
+
+                    <div class="font-medium">
+                        {{ contact.first_name }}
+                        {{ contact.last_name }}
+                    </div>
+
+
+                    {% if contact.phone %}
+
+                    <div class="text-sm text-slate-400">
+                        {{ contact.phone }}
+                    </div>
+
+                    {% endif %}
+
+
+                    {% if contact.email %}
+
+                    <div class="text-sm text-slate-400">
+                        {{ contact.email }}
+                    </div>
+
+                    {% endif %}
+
+                </div>
+
+
+            {% empty %}
+
+                <div class="
+                    bg-white
+                    dark:bg-slate-800
+                    border
+                    border-orange-500
+                    rounded-xl
+                    p-6
+                    text-orange-500
+                ">
+                    Keine Ansprechpartner vorhanden
+                </div>
+
+            {% endfor %}
+
+        </div>
+
+
+
+        <!-- Standorte -->
+
+        <div>
+
+            <h3 class="font-bold mb-3">
+                Standorte
+            </h3>
+
+
+            {% for location in item.locations.all %}
+
+                <div class="
+                    bg-slate-100
+                    dark:bg-slate-700
+                    rounded-xl
+                    p-3
+                    mb-2
+                ">
+
+                    <div class="font-medium">
+                        {{ location.name }}
+                    </div>
+
+
+                    <div class="text-sm text-slate-400">
+                        {{ location.street }}
+                    </div>
+
+
+                    <div class="text-sm text-slate-400">
+                        {{ location.zip_code }}
+                        {{ location.city }}
+                    </div>
+
+
+                    <div class="text-sm text-slate-400">
+                        {{ location.country }}
+                    </div>
+
+                </div>
+
+
+            {% empty %}
+
+                <div class="
+                    bg-white
+                    dark:bg-slate-800
+                    border
+                    border-orange-500
+                    rounded-xl
+                    p-6
+                    text-orange-500
+                ">
+                    Keine Standorte vorhanden
+                </div>
+
+            {% endfor %}
+
+        </div>
+
+
+
+        <!-- Projekte -->
+
+        <div>
+
+            <h3 class="font-bold mb-3">
+                Projekte
+            </h3>
+
+
+            {% for project in item.projects.all %}
+
+                <div class="
+                    bg-slate-100
+                    dark:bg-slate-700
+                    rounded-xl
+                    p-3
+                    mb-2
+                ">
+
+                    {{ project.name }}
+
+                </div>
+
+
+            {% empty %}
+
+                <div class="
+                    bg-white
+                    dark:bg-slate-800
+                    border
+                    border-orange-500
+                    rounded-xl
+                    p-6
+                    text-orange-500
+                ">
+                    Keine Projekte zugeordnet
+                </div>
+
+            {% endfor %}
+
+        </div>
+
+
+    </div>
+
+
+
+    <div class="mt-5 flex gap-2">
+
+
+        <a
+            href="{% url 'invoices:customers_detail' item.id %}"
+            class="btn btn-edit">
+
+            Bearbeiten
+
+        </a>
+
+
+
+        <form
+            method="post"
+            action="{% url 'invoices:customers_reactivate' item.id %}">
+
+            {% csrf_token %}
+
+
+            <button
+                type="submit"
+                name="archiv"
+                value="1"
+                class="btn btn-action">
+
+                Aktivieren
+
+            </button>
+
+
+        </form>
+
+
+    </div>
+
+
+</div>

invoices/templates/invoices/tables/invoice_items/actions.html

@@ -0,0 +1,20 @@
+<form
+    method="post"
+    action="{% url 'invoices:invoice_item_delete' invoice.id record.id %}">
+
+    {% csrf_token %}
+
+    <input
+        type="hidden"
+        name="delete_item"
+        value="{{ record.id }}">
+
+    <button
+        type="submit"
+        class="btn btn-delete">
+
+        Löschen
+
+    </button>
+
+</form>

invoices/templates/invoices/tables/invoice_items/service_period.html

@@ -0,0 +1,7 @@
+{% if record.service_period_from %}
+    {{ record.service_period_from|date:"d.m.Y" }}
+{% endif %}
+
+{% if record.service_period_to %}
+    - {{ record.service_period_to|date:"d.m.Y" }}
+{% endif %}

invoices/templates/invoices/tables/invoice_items/tax_rate.html

@@ -0,0 +1 @@
+USt. {{ record.unit_tax_rate|floatformat:0 }}%

invoices/templates/invoices/tables/invoice_items/total.html

@@ -0,0 +1 @@
+{{ record.calculated_total_net|floatformat:2 }} €

invoices/templates/invoices/tables/invoice_items/unit_price.html

@@ -0,0 +1 @@
+{{ record.unit_price_net }} €

invoices/templates/invoices/tables/invoices/actions.html

@@ -0,0 +1,7 @@
+<a
+    href="{% url 'invoices:invoices_detail' record.id %}"
+    class="btn btn-edit">
+
+    Bearbeiten
+
+</a>

invoices/templates/invoices/tables/items/actions.html

@@ -0,0 +1,35 @@
+<form
+    id="save-form-{{ record.id }}"
+    method="post"
+    action="{% url 'invoices:items_edit' record.id %}">
+
+    {% csrf_token %}
+
+</form>
+
+
+<div class="flex gap-2">
+
+    <button
+        type="submit"
+        form="save-form-{{ record.id }}"
+        class="btn btn-save">
+        Speichern
+    </button>
+
+
+    <form
+        method="post"
+        action="{% url 'invoices:items_delete' record.id %}">
+
+        {% csrf_token %}
+
+        <button
+            type="submit"
+            class="btn btn-delete">
+            Löschen
+        </button>
+
+    </form>
+
+</div>

invoices/templates/invoices/tables/items/description.html

@@ -0,0 +1,6 @@
+<input
+    type="text"
+    name="description"
+    form="save-form-{{ record.id }}"
+    value="{{ record.description }}"
+    class="border rounded px-2 py-1 w-full">

invoices/templates/invoices/tables/items/item_type.html

@@ -0,0 +1,16 @@
+<select
+    name="item_type"
+    form="save-form-{{ record.id }}"
+    class="border rounded px-2 py-1 w-full">
+
+    {% for v,l in table.types %}
+
+        <option
+            value="{{ v }}"
+            {% if record.item_type == v %}selected{% endif %}>
+            {{ l }}
+        </option>
+
+    {% endfor %}
+
+</select>

invoices/templates/invoices/tables/items/price_net.html

@@ -0,0 +1,7 @@
+<input
+    type="number"
+    step="0.01"
+    name="price_net"
+    form="save-form-{{ record.id }}"
+    value="{{ record.price_net }}"
+    class="border rounded px-2 py-1 w-full">

invoices/templates/invoices/tables/items/tax_rate.html

@@ -0,0 +1,7 @@
+<input
+    type="number"
+    step="0.01"
+    name="tax_rate"
+    form="save-form-{{ record.id }}"
+    value="{{ record.tax_rate }}"
+    class="border rounded px-2 py-1 w-full">

invoices/templates/invoices/tables/items/unit.html

@@ -0,0 +1,20 @@
+<select
+    name="unit"
+    form="save-form-{{ record.id }}"
+    class="border rounded px-2 py-1 w-full">
+
+
+    {% for unit in table.units %}
+
+        <option
+            value="{{ unit.id }}"
+            {% if record.unit_id == unit.id %}selected{% endif %}>
+
+            {{ unit.name }}
+
+        </option>
+
+    {% endfor %}
+
+
+</select>

invoices/templates/invoices/tables/offer_items/actions.html

@@ -0,0 +1,20 @@
+<form
+    method="post"
+    action="{% url 'invoices:offers_item_delete' table.offer.id record.id %}">
+
+    {% csrf_token %}
+
+    <input
+        type="hidden"
+        name="delete_item"
+        value="{{ record.id }}">
+
+    <button
+        type="submit"
+        class="btn btn-delete">
+
+        Löschen
+
+    </button>
+
+</form>

invoices/templates/invoices/tables/offer_items/tax_rate.html

@@ -0,0 +1 @@
+USt. {{ record.unit_tax_rate|floatformat:0 }}%

invoices/templates/invoices/tables/offer_items/total.html

@@ -0,0 +1 @@
+{{ record.calculated_total_net|floatformat:2 }} €

invoices/templates/invoices/tables/offer_items/unit_price.html

@@ -0,0 +1 @@
+{{ record.unit_price_net }} €

invoices/templates/invoices/tables/offers/actions.html

@@ -0,0 +1,7 @@
+<a
+    href="{% url 'invoices:offers_detail' record.id %}"
+    class="btn btn-edit">
+
+    Bearbeiten
+
+</a>

invoices/templates/invoices/tables/reminders/actions.html

@@ -0,0 +1,7 @@
+<a
+    href="{% url 'invoices:reminders_detail' record.id %}"
+    class="btn btn-edit">
+
+    Bearbeiten
+
+</a>

invoices/templates/invoices/tables/reminders/invoice.html

@@ -0,0 +1,7 @@
+<a
+    class="company_link"
+    href="{% url 'invoices:invoices_detail' record.invoice.id %}">
+    
+    {{ record.invoice.invoice_number }}
+
+</a>

invoices/tests.py

@@ -0,0 +1,3 @@
+from django.test import TestCase
+
+# Create your tests here.

invoices/urls.py

@@ -0,0 +1,77 @@
+from django.urls import path
+from . import views
+
+app_name = "invoices"
+
+urlpatterns = [
+    path("", views.invoices_overview, name="overview"),
+
+
+    # Kunden
+    path("customers/", views.customers_overview, name="customers_overview"),
+    path("customers/add/", views.customers_add, name="customers_add"),
+    path("customers/<int:customer_id>/", views.customers_detail, name="customers_detail"),
+    path("customers/<int:customer_id>/edit/", views.customers_edit, name="customers_edit"),
+    path("customers/<int:customer_id>/archive/", views.customers_archive, name="customers_archive"),
+    path("customers/<int:customer_id>/reactivate/", views.customers_reactivate, name="customers_reactivate"),
+
+
+    # Items
+    path("items/", views.items_overview, name="items_overview"),
+    path("items/add/", views.items_add, name="items_add"),
+    path("items/<int:item_id>/edit/", views.items_edit, name="items_edit"),
+    path("items/<int:item_id>/delete/", views.items_delete, name="items_delete"),
+
+
+    # Rechnungen
+    path("invoices/", views.invoices_invoices_overview, name="invoices_invoices_overview"),
+    path("invoices/<int:invoice_id>/", views.invoices_detail, name="invoices_detail"),
+
+    path("invoices/add/customer/", views.invoice_add_customer, name="invoice_add_customer"),
+    path("invoices/add/project/", views.invoice_add_project, name="invoice_add_project"),
+
+    path("invoices/<int:invoice_id>/items/add/", views.invoice_item_add, name="invoice_item_add"),
+    path("invoices/<int:invoice_id>/items/<int:item_id>/delete/", views.invoice_item_delete, name="invoice_item_delete"),
+
+    path("invoices/<int:invoice_id>/preview/", views.invoices_preview, name="invoices_preview"),
+    path("invoices/<int:invoice_id>/download/", views.invoices_download, name="invoices_download"),
+    path("invoices/<int:invoice_id>/cancel/", views.invoices_cancel, name="invoices_cancel"),
+    path("invoices/<int:invoice_id>/paid/", views.invoices_paid, name="invoices_paid"),
+    path("invoices/<int:invoice_id>/overdue/", views.invoices_overdue, name="invoices_overdue"),
+    path("invoices/<int:invoice_id>/delete/", views.invoices_delete, name="invoices_delete"),
+
+
+    # Angebote
+    path("offers/", views.invoices_offers_overview, name="invoices_offers_overview"),
+    path("offers/<int:offer_id>/", views.offers_detail, name="offers_detail"),
+    
+    path("offers/add/", views.invoices_offers_add, name="invoices_offers_add"),
+
+    path("offers/<int:offer_id>/items/add/", views.offers_item_add, name="offers_item_add"),
+    path("offers/<int:offer_id>/items/<int:item_id>/delete/", views.offers_item_delete, name="offers_item_delete"),
+
+    path("offers/<int:offer_id>/preview/", views.offers_preview, name="offers_preview"),
+    path("offers/<int:offer_id>/download/", views.offers_download, name="offers_download"),
+    path("offers/<int:offer_id>/accept/", views.offers_accept, name="offers_accept"),
+    path("offers/<int:offer_id>/reject/", views.offers_reject, name="offers_reject"),
+    path("offers/<int:offer_id>/expire/", views.offers_expire, name="offers_expire"),
+    path("offers/<int:offer_id>/delete/", views.offers_delete, name="offers_delete"),
+
+    # Mahnungen
+    path("reminders/", views.invoices_reminders_overview, name="invoices_reminders_overview"),
+    path("reminders/<int:reminder_id>/", views.reminders_detail, name="reminders_detail"),
+    path("reminders/add/", views.invoices_reminders_add, name="invoices_reminders_add"),
+    path("reminders/<int:reminder_id>/download/", views.reminders_download, name="reminders_download"),
+    path("reminders/<int:reminder_id>/cancel/", views.reminders_cancel, name="reminders_cancel"),
+    path("reminders/<int:reminder_id>/delete/", views.reminders_delete, name="reminders_delete"),
+    path("reminders/<int:reminder_id>/expire/", views.reminders_expire, name="reminders_expire"),
+    path("reminders/<int:reminder_id>/paid/", views.reminders_paid, name="reminders_paid"),
+
+
+    # AJAX
+    path("ajax/customer/<int:customer_id>/contacts/", views.ajax_contacts, name="ajax_contacts"),
+    path("ajax/customer/<int:customer_id>/locations/", views.ajax_locations, name="ajax_locations"),
+    path("ajax/project/<int:project_id>/invoice-data/", views.ajax_invoicedata, name="ajax_invoicedata"),
+    path("ajax/invoice/<int:invoice_id>/sources/", views.ajax_invoiceitemsources, name="ajax_invoice_item_sources"),
+    path("ajax/invoice-item-data/", views.ajax_invoice_item_data, name="ajax_invoice_item_data"),
+]