import uuid
from django.test import TestCase
from unittest.mock import patch
from datetime import datetime
from django.contrib.auth import get_user_model

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


class TasksTests(TestCase):
    def setUp(self):
        # Kreiramo klijenta koji vraća PaperlessGateway; email jedinstven radi izbjegavanja duplikata
        self.client = Client.objects.create(
            name="Paperless Corp",
            email=f"paperless+{uuid.uuid4()}@example.test"
        )
        User = get_user_model()
        # Kreiramo sistemskog korisnika koji već postoji (trebao bi se koristiti)
        self.system_user = User.objects.create_user(
            username="bot@erp.hr",
            email="bot@erp.hr",
            password="pass"
        )

    @patch("modules.invoicing.tasks.PaperlessGateway.get_document_metadata")
    @patch("modules.invoicing.tasks.InvoiceService.create_full_invoice")
    def test_process_paperless_document_calls_service(self, mock_create_full_invoice, mock_get_metadata):
        # simuliramo odgovor infrastrukture
        mock_get_metadata.return_value = {
            "created": "2026-01-01T00:00:00Z",
            "correspondent": "Paperless Corp",
            "total_amount": "100.00"
        }

        # Pozovemo task sinkrono pomoću .apply (ispravno mapira argumente)
        tasks.process_paperless_document_task.apply(args=(123,))

        # Očekujemo da je pozvan servis za izradu fakture
        mock_create_full_invoice.assert_called()