import uuid
from django.test import TestCase
from django.contrib.auth import get_user_model
from modules.fleet.services import VehicleService
from modules.fleet.models import Vehicle, WorkOrder, VehicleServiceRecord
from modules.task_management.models import Task


class FleetServiceTests(TestCase):
    def setUp(self):
        User = get_user_model()
        self.user = User.objects.create_user(username="tech2", email=f"tech2+{uuid.uuid4()}@example.test", password="pass")
        self.vehicle = Vehicle.objects.create(
            registration_number=f"RI-{uuid.uuid4().hex[:6].upper()}",
            make="VW",
            model="Polo",
            current_mileage=5000,
            service_interval_km=10000,
            assigned_servicer=self.user
        )

    def test_create_work_order_via_service(self):
        data = {"vehicle": self.vehicle, "creator": self.user, "start_mileage": 5000, "end_mileage": 5200, "purpose": "kontrola"}
        wo = VehicleService.create_work_order(data)
        self.vehicle.refresh_from_db()
        self.assertEqual(self.vehicle.current_mileage, 5200)
        self.assertEqual(wo.distance, 200)

    def test_create_service_record_via_service(self):
        data = {"vehicle": self.vehicle, "performed_by": self.user, "description": "Brake pads", "mileage": 5200, "cost": "120.00"}
        rec = VehicleService.create_service_record(data)
        self.vehicle.refresh_from_db()
        self.assertEqual(rec.next_service_due_at, 5200 + self.vehicle.service_interval_km)
        self.assertEqual(self.vehicle.current_mileage, 5200)
    
    def test_vehicle_next_service_at_logic(self):
        # current=12000, interval=15000 -> blocks=(12000//15000)+1 = 1 -> 1*15000 = 15000
        v = Vehicle.objects.create(current_mileage=12000, service_interval_km=15000)
        assert v.next_service_at() == 15000
        
        # current=16000, interval=15000 -> blocks=(16000//15000)+1 = 2 -> 2*15000 = 30000
        v.current_mileage = 16000
        assert v.next_service_at() == 30000
    
    def test_work_order_distance_property(self):
        vehicle = Vehicle.objects.create(registration_number="ZG-004")
        # Nalog bez završne kilometraže
        wo = WorkOrder.objects.create(vehicle=vehicle, creator=self.user, start_mileage=1000)
        assert wo.distance is None
        
        # Nalog sa završnom kilometražom
        wo.end_mileage = 1100
        assert wo.distance == 100

    def test_closing_work_order_moves_task_to_ready_for_completion(self):
        work_order = WorkOrder.objects.create(
            vehicle=self.vehicle,
            creator=self.user,
            purpose="kontrola",
            status="open",
            start_mileage=5000,
            end_mileage=5200,
        )
        task = Task.objects.create(
            title="Servis",
            description="",
            status="servis",
            assigned_to=self.user,
            vehicle=self.vehicle,
            work_order=work_order,
        )

        VehicleService.update_work_order(work_order, {"status": "closed"})
        task.refresh_from_db()
        self.assertEqual(task.status, "spreman_za_zavrsetak")