from django.test import TestCase
from modules.task_management.serializers import TaskSerializer
from rest_framework.exceptions import ValidationError
from django.contrib.auth import get_user_model
from modules.task_management.models import Task
from modules.fleet.models import Vehicle, WorkOrder


class TaskSerializerTests(TestCase):
    def test_validate_title_too_short_raises(self):
        serializer = TaskSerializer(data={"title": "ab", "description": "", "status": "aktivan"})
        with self.assertRaises(ValidationError):
            serializer.is_valid(raise_exception=True)

    def test_validate_title_ok(self):
        serializer = TaskSerializer(data={"title": "Valid title", "description": "", "status": "aktivan"})
        assert serializer.is_valid(), serializer.errors

    def test_cannot_close_without_work_order(self):
        serializer = TaskSerializer(data={"title": "Task 1", "description": "", "status": "neaktivan"})
        with self.assertRaises(ValidationError):
            serializer.is_valid(raise_exception=True)

    def test_can_close_with_work_order(self):
        User = get_user_model()
        user = User.objects.create_user(username="task-user", email="task-user@example.test", password="pass")
        vehicle = Vehicle.objects.create(registration_number="ZG-TSK-02", asset_type='crane')
        work_order = WorkOrder.objects.create(vehicle=vehicle, creator=user, purpose='defektaza')
        task = Task.objects.create(title="Task 2", description="", status="servis", assigned_to=user)

        serializer = TaskSerializer(instance=task, data={"status": "neaktivan", "work_order": str(work_order.id)}, partial=True)
        assert serializer.is_valid(), serializer.errors