/**
 * @ai-summary Unit tests for VehiclesService
 * @ai-context Tests business logic with mocked dependencies
 */

import { VehiclesService } from '../../domain/vehicles.service';
import { VehiclesRepository } from '../../data/vehicles.repository';
import { cacheService } from '../../../../core/config/redis';
import * as platformModule from '../../../platform';

// Mock dependencies
jest.mock('../../data/vehicles.repository');
jest.mock('../../../../core/config/redis');
jest.mock('../../../platform', () => ({
  getVehicleDataService: jest.fn(),
  getPool: jest.fn()
}));

const mockRepository = jest.mocked(VehiclesRepository);
const mockCacheService = jest.mocked(cacheService);
const mockGetVehicleDataService = jest.mocked(platformModule.getVehicleDataService);
const mockGetPool = jest.mocked(platformModule.getPool);

describe('VehiclesService', () => {
  let service: VehiclesService;
  let repositoryInstance: jest.Mocked<VehiclesRepository>;
  let vehicleDataServiceMock: {
    getYears: jest.Mock;
    getMakes: jest.Mock;
    getModels: jest.Mock;
    getTrims: jest.Mock;
    getEngines: jest.Mock;
  };

  beforeEach(() => {
    jest.clearAllMocks();

    vehicleDataServiceMock = {
      getYears: jest.fn(),
      getMakes: jest.fn(),
      getModels: jest.fn(),
      getTrims: jest.fn(),
      getEngines: jest.fn(),
    };

    mockGetVehicleDataService.mockReturnValue(vehicleDataServiceMock as any);
    mockGetPool.mockReturnValue('mock-pool' as any);

    repositoryInstance = {
      create: jest.fn(),
      findByUserId: jest.fn(),
      findById: jest.fn(),
      findByUserAndVIN: jest.fn(),
      update: jest.fn(),
      softDelete: jest.fn(),
    } as any;

    mockRepository.mockImplementation(() => repositoryInstance);
    service = new VehiclesService(repositoryInstance);
  });

  describe('dropdown data integration', () => {
    it('retrieves years from platform service', async () => {
      vehicleDataServiceMock.getYears.mockResolvedValue([2024, 2023]);

      const result = await service.getDropdownYears();

      expect(mockGetVehicleDataService).toHaveBeenCalled();
      expect(vehicleDataServiceMock.getYears).toHaveBeenCalledWith('mock-pool');
      expect(result).toEqual([2024, 2023]);
    });

    it('retrieves makes scoped to year', async () => {
      vehicleDataServiceMock.getMakes.mockResolvedValue([{ id: 10, name: 'Honda' }]);

      const result = await service.getDropdownMakes(2024);

      expect(vehicleDataServiceMock.getMakes).toHaveBeenCalledWith('mock-pool', 2024);
      expect(result).toEqual([{ id: 10, name: 'Honda' }]);
    });

    it('retrieves models scoped to year and make', async () => {
      vehicleDataServiceMock.getModels.mockResolvedValue([{ id: 20, name: 'Civic' }]);

      const result = await service.getDropdownModels(2024, 10);

      expect(vehicleDataServiceMock.getModels).toHaveBeenCalledWith('mock-pool', 2024, 10);
      expect(result).toEqual([{ id: 20, name: 'Civic' }]);
    });

    it('retrieves trims scoped to year, make, and model', async () => {
      vehicleDataServiceMock.getTrims.mockResolvedValue([{ id: 30, name: 'Sport' }]);

      const result = await service.getDropdownTrims(2024, 10, 20);

      expect(vehicleDataServiceMock.getTrims).toHaveBeenCalledWith('mock-pool', 2024, 20);
      expect(result).toEqual([{ id: 30, name: 'Sport' }]);
    });

    it('retrieves engines scoped to selection', async () => {
      vehicleDataServiceMock.getEngines.mockResolvedValue([{ id: 40, name: '2.0L Turbo' }]);

      const result = await service.getDropdownEngines(2024, 10, 20, 30);

      expect(vehicleDataServiceMock.getEngines).toHaveBeenCalledWith('mock-pool', 2024, 20, 30);
      expect(result).toEqual([{ id: 40, name: '2.0L Turbo' }]);
    });

    it('returns static transmission options', async () => {
      const result = await service.getDropdownTransmissions(2024, 10, 20);

      expect(result).toEqual([
        { id: 1, name: 'Automatic' },
        { id: 2, name: 'Manual' }
      ]);
    });
  });

  describe('createVehicle', () => {
    const mockVehicleData = {
      vin: '1HGBH41JXMN109186',
      nickname: 'My Car',
      color: 'Blue',
      odometerReading: 50000,
    };

    const mockCreatedVehicle = {
      id: 'vehicle-id-123',
      userId: 'user-123',
      vin: '1HGBH41JXMN109186',
      make: undefined,
      model: undefined,
      year: undefined,
      nickname: 'My Car',
      color: 'Blue',
      licensePlate: undefined,
      odometerReading: 50000,
      isActive: true,
      deletedAt: undefined,
      createdAt: new Date('2024-01-01T00:00:00Z'),
      updatedAt: new Date('2024-01-01T00:00:00Z'),
    };

    it('should create a vehicle with user-provided VIN', async () => {
      repositoryInstance.findByUserAndVIN.mockResolvedValue(null);
      repositoryInstance.create.mockResolvedValue(mockCreatedVehicle);
      mockCacheService.del.mockResolvedValue(undefined);

      const result = await service.createVehicle(mockVehicleData, 'user-123');

      expect(repositoryInstance.findByUserAndVIN).toHaveBeenCalledWith('user-123', '1HGBH41JXMN109186');
      expect(repositoryInstance.create).toHaveBeenCalledWith({
        ...mockVehicleData,
        userId: 'user-123',
        make: undefined,
        model: undefined,
      });
      expect(result.id).toBe('vehicle-id-123');
    });

    it('should reject invalid VIN format', async () => {
      const invalidVin = { ...mockVehicleData, vin: 'INVALID' };

      await expect(service.createVehicle(invalidVin, 'user-123')).rejects.toThrow('Invalid VIN format');
    });

    it('should reject duplicate VIN for same user', async () => {
      repositoryInstance.findByUserAndVIN.mockResolvedValue(mockCreatedVehicle);

      await expect(service.createVehicle(mockVehicleData, 'user-123')).rejects.toThrow('Vehicle with this VIN already exists');
    });
  });

  describe('getUserVehicles', () => {
    it('should return cached vehicles if available', async () => {
      const cachedVehicles = [{ id: 'vehicle-1', vin: '1HGBH41JXMN109186' }];
      mockCacheService.get.mockResolvedValue(cachedVehicles);

      const result = await service.getUserVehicles('user-123');

      expect(mockCacheService.get).toHaveBeenCalledWith('vehicles:user:user-123');
      expect(result).toBe(cachedVehicles);
      expect(repositoryInstance.findByUserId).not.toHaveBeenCalled();
    });

    it('should fetch from database and cache if not cached', async () => {
      const mockVehicles = [
        {
          id: 'vehicle-id-123',
          userId: 'user-123',
          vin: '1HGBH41JXMN109186',
          make: 'Honda',
          model: 'Civic',
          year: 2021,
          nickname: 'My Car',
          color: 'Blue',
          licensePlate: undefined,
          odometerReading: 50000,
          isActive: true,
          deletedAt: undefined,
          createdAt: new Date('2024-01-01T00:00:00Z'),
          updatedAt: new Date('2024-01-01T00:00:00Z'),
        }
      ];

      mockCacheService.get.mockResolvedValue(null);
      repositoryInstance.findByUserId.mockResolvedValue(mockVehicles);
      mockCacheService.set.mockResolvedValue(undefined);

      const result = await service.getUserVehicles('user-123');

      expect(repositoryInstance.findByUserId).toHaveBeenCalledWith('user-123');
      expect(mockCacheService.set).toHaveBeenCalledWith('vehicles:user:user-123', expect.any(Array), 300);
      expect(result).toHaveLength(1);
      expect(result[0].id).toBe('vehicle-id-123');
    });
  });

  describe('getVehicle', () => {
    const mockVehicle = {
      id: 'vehicle-id-123',
      userId: 'user-123',
      vin: '1HGBH41JXMN109186',
      make: 'Honda',
      model: 'Civic',
      year: 2021,
      nickname: 'My Car',
      color: 'Blue',
      licensePlate: undefined,
      odometerReading: 50000,
      isActive: true,
      deletedAt: undefined,
      createdAt: new Date('2024-01-01T00:00:00Z'),
      updatedAt: new Date('2024-01-01T00:00:00Z'),
    };

    it('should return vehicle if found and owned by user', async () => {
      repositoryInstance.findById.mockResolvedValue(mockVehicle);

      const result = await service.getVehicle('vehicle-id-123', 'user-123');

      expect(repositoryInstance.findById).toHaveBeenCalledWith('vehicle-id-123');
      expect(result.id).toBe('vehicle-id-123');
    });

    it('should throw error if vehicle not found', async () => {
      repositoryInstance.findById.mockResolvedValue(null);

      await expect(service.getVehicle('vehicle-id-123', 'user-123')).rejects.toThrow('Vehicle not found');
    });

    it('should throw error if user is not owner', async () => {
      repositoryInstance.findById.mockResolvedValue({ ...mockVehicle, userId: 'other-user' });

      await expect(service.getVehicle('vehicle-id-123', 'user-123')).rejects.toThrow('Unauthorized');
    });
  });

  describe('updateVehicle', () => {
    const mockVehicle = {
      id: 'vehicle-id-123',
      userId: 'user-123',
      vin: '1HGBH41JXMN109186',
      make: 'Honda',
      model: 'Civic',
      year: 2021,
      nickname: 'My Car',
      color: 'Blue',
      licensePlate: undefined,
      odometerReading: 50000,
      isActive: true,
      deletedAt: undefined,
      createdAt: new Date('2024-01-01T00:00:00Z'),
      updatedAt: new Date('2024-01-01T00:00:00Z'),
    };

    it('should update vehicle successfully', async () => {
      const updateData = { nickname: 'Updated Car', color: 'Red' };
      const updatedVehicle = { ...mockVehicle, ...updateData };

      repositoryInstance.findById.mockResolvedValue(mockVehicle);
      repositoryInstance.update.mockResolvedValue(updatedVehicle);
      mockCacheService.del.mockResolvedValue(undefined);

      const result = await service.updateVehicle('vehicle-id-123', updateData, 'user-123');

      expect(repositoryInstance.findById).toHaveBeenCalledWith('vehicle-id-123');
      expect(repositoryInstance.update).toHaveBeenCalledWith('vehicle-id-123', updateData);
      expect(mockCacheService.del).toHaveBeenCalledWith('vehicles:user:user-123');
      expect(result.nickname).toBe('Updated Car');
      expect(result.color).toBe('Red');
    });

    it('should throw error if vehicle not found', async () => {
      repositoryInstance.findById.mockResolvedValue(null);

      await expect(service.updateVehicle('vehicle-id-123', {}, 'user-123')).rejects.toThrow('Vehicle not found');
    });

    it('should throw error if user is not owner', async () => {
      repositoryInstance.findById.mockResolvedValue({ ...mockVehicle, userId: 'other-user' });

      await expect(service.updateVehicle('vehicle-id-123', {}, 'user-123')).rejects.toThrow('Unauthorized');
    });
  });

  describe('deleteVehicle', () => {
    const mockVehicle = {
      id: 'vehicle-id-123',
      userId: 'user-123',
      vin: '1HGBH41JXMN109186',
      make: 'Honda',
      model: 'Civic',
      year: 2021,
      nickname: 'My Car',
      color: 'Blue',
      licensePlate: undefined,
      odometerReading: 50000,
      isActive: true,
      deletedAt: undefined,
      createdAt: new Date('2024-01-01T00:00:00Z'),
      updatedAt: new Date('2024-01-01T00:00:00Z'),
    };

    it('should delete vehicle successfully', async () => {
      repositoryInstance.findById.mockResolvedValue(mockVehicle);
      repositoryInstance.softDelete.mockResolvedValue(true);
      mockCacheService.del.mockResolvedValue(undefined);

      await service.deleteVehicle('vehicle-id-123', 'user-123');

      expect(repositoryInstance.findById).toHaveBeenCalledWith('vehicle-id-123');
      expect(repositoryInstance.softDelete).toHaveBeenCalledWith('vehicle-id-123');
      expect(mockCacheService.del).toHaveBeenCalledWith('vehicles:user:user-123');
    });

    it('should throw error if vehicle not found', async () => {
      repositoryInstance.findById.mockResolvedValue(null);

      await expect(service.deleteVehicle('vehicle-id-123', 'user-123')).rejects.toThrow('Vehicle not found');
    });

    it('should throw error if user is not owner', async () => {
      repositoryInstance.findById.mockResolvedValue({ ...mockVehicle, userId: 'other-user' });

      await expect(service.deleteVehicle('vehicle-id-123', 'user-123')).rejects.toThrow('Unauthorized');
    });
  });
});