prvi kod za live uporabu

backend/modules/invoicing/services.py

@@ -0,0 +1,77 @@
+from django.utils import timezone
+from modules.invoicing.models import Invoice, InvoiceItem
+from modules.invoicing.utils import generate_invoice_number
+from django.db import transaction
+from django.contrib.auth import get_user_model
+from rest_framework.exceptions import ValidationError
+import logging
+from decimal import Decimal
+from modules.invoicing import tasks  # premještamo ovdje ako treba
+
+logger = logging.getLogger(__name__)
+
+class InvoiceService:
+    @staticmethod
+    def create_full_invoice(user=None, **validated_data):
+        # 1. Obavezno dohvati stavke
+        items_data = validated_data.pop('items', [])
+
+        fields_to_remove = ['amount', 'creator', 'invoice_number']
+        for field in fields_to_remove:
+            validated_data.pop(field, None)
+
+        # 2. Sigurna provjera korisnika
+        if not user:
+            User = get_user_model()
+            try:
+                user = User.objects.get(username="paperless_bot")
+            except User.DoesNotExist:
+                raise ValidationError("Sistemski korisnik 'paperless_bot' ne postoji.")
+
+        with transaction.atomic():
+            # 3. Računanje iznosa (sigurno rukovanje s items_data)
+            total = sum(Decimal(item['quantity']) * Decimal(item['unit_price']) for item in items_data)
+
+            # 4. Kreiraj fakturu
+            invoice = Invoice.objects.create(
+                **validated_data,
+                amount=total,
+                creator=user,
+                invoice_number=generate_invoice_number()
+            )
+
+            # 5. Kreiraj stavke
+            for item_data in items_data:
+                InvoiceItem.objects.create(invoice=invoice, **item_data)
+
+            # 6. Pokreni task nakon commit-a
+            transaction.on_commit(lambda: tasks.process_paperless_document_task.delay(invoice.id))
+
+        return invoice
+
+    @staticmethod
+    def create_invoice_entry(data, user=None):
+        """
+        Kreira financijski zapis (transaction) na temelju validated data.
+        Očekuje se da data['invoice'] može biti instanca ili PK.
+        """
+        from modules.invoicing.models import InvoiceTransaction, Invoice
+
+        invoice = data.get("invoice")
+        if isinstance(invoice, int):
+            invoice = Invoice.objects.get(pk=invoice)
+        elif hasattr(invoice, "pk") is False:
+            raise ValidationError("Nevažeći invoice.")
+
+        amount = data.get("amount")
+        payment_date = data.get("payment_date", None)
+        work_order = data.get("work_order")
+
+        tx = InvoiceTransaction.objects.create(
+            invoice=invoice,
+            work_order=work_order,
+            invoice_number=invoice.invoice_number,
+            amount=amount,
+            payment_date=payment_date or timezone.now()
+        )
+        return tx