import uuid
from django.test import TestCase
from django.urls import reverse
from rest_framework.test import APIClient
from django.contrib.auth import get_user_model
from decimal import Decimal
from datetime import date

from modules.crm.models import Client
from modules.invoicing.models import Invoice


class InvoiceAPITests(TestCase):
    def setUp(self):
        self.api_client = APIClient()
        User = get_user_model()
        # Kreiraj test korisnika (ako treba autentikacija)
        self.user = User.objects.create_user(
            username=f"user_{uuid.uuid4().hex[:8]}",
            email=f"user+{uuid.uuid4().hex[:8]}@example.test",
            password="pass"
        )
        # Kreiraj jedinstvenog klijenta (email s uuid kako bismo izbjegli duplicate key)
        self.client_obj = Client.objects.create(
            name="API Test Client",
            email=f"client+{uuid.uuid4()}@example.test"
        )
        # autentikacija ako je endpoint zaštićen
        self.api_client.force_authenticate(user=self.user)

    def test_api_creates_invoice_with_id(self):
        url = reverse('invoice-list')  # prilagodi ako je druga ruta
        payload = {
            "client": self.client_obj.id,
            "due_date": date.today().isoformat(),
            "items": [
                {"description": "Test item", "quantity": "1.00", "unit_price": "10.00"}
            ]
        }

        response = self.api_client.post(url, payload, format='json')
        assert response.status_code in (200, 201)
        # provjeri da se faktura stvorila i da vraća id/kod
        created = Invoice.objects.filter(client=self.client_obj).first()
        assert created is not None
        assert created.amount == Decimal("10.00")