import { describe, it, expect, vi, beforeEach } from 'vitest';
import { RacesPageQuery } from './RacesPageQuery';
import { RacesService } from '@/lib/services/races/RacesService';
import { Result } from '@/lib/contracts/Result';
import { RacesViewDataBuilder } from '@/lib/builders/view-data/RacesViewDataBuilder';
import { mapToPresentationError } from '@/lib/contracts/page-queries/PresentationError';

// Mock dependencies
vi.mock('@/lib/services/races/RacesService', () => ({
  RacesService: vi.fn(class {
    getRacesPageData = vi.fn();
  }),
}));

vi.mock('@/lib/builders/view-data/RacesViewDataBuilder', () => ({
  RacesViewDataBuilder: {
    build: vi.fn(),
  },
}));

vi.mock('@/lib/contracts/page-queries/PresentationError', () => ({
  mapToPresentationError: vi.fn(),
}));

describe('RacesPageQuery', () => {
  let query: RacesPageQuery;
  let mockServiceInstance: any;

  beforeEach(() => {
    vi.clearAllMocks();
    query = new RacesPageQuery();
    mockServiceInstance = {
      getRacesPageData: vi.fn(),
    };
    (RacesService as any).mockImplementation(function () {
      return mockServiceInstance;
    });
  });

  it('should return view data when service succeeds', async () => {
    const apiDto = { races: [{ id: 'race-123' }], featured: [{ id: 'race-456' }] };
    const viewData = { races: [{ id: 'race-123' }], featured: [{ id: 'race-456' }] };

    mockServiceInstance.getRacesPageData.mockResolvedValue(Result.ok(apiDto));
    (RacesViewDataBuilder.build as any).mockReturnValue(viewData);

    const result = await query.execute();

    expect(result.isOk()).toBe(true);
    expect(result.unwrap()).toEqual(viewData);
    expect(RacesService).toHaveBeenCalled();
    expect(mockServiceInstance.getRacesPageData).toHaveBeenCalled();
    expect(RacesViewDataBuilder.build).toHaveBeenCalledWith(apiDto);
  });

  it('should return mapped presentation error when service fails', async () => {
    const serviceError = { type: 'notFound' };
    const presentationError = 'notFound';

    mockServiceInstance.getRacesPageData.mockResolvedValue(Result.err(serviceError));
    (mapToPresentationError as any).mockReturnValue(presentationError);

    const result = await query.execute();

    expect(result.isErr()).toBe(true);
    expect(result.getError()).toBe(presentationError);
    expect(mapToPresentationError).toHaveBeenCalledWith(serviceError);
  });

  it('should return serverError on exception', async () => {
    mockServiceInstance.getRacesPageData.mockRejectedValue(new Error('Network error'));

    const result = await query.execute();

    expect(result.isErr()).toBe(true);
    expect(result.getError()).toBe('Network error');
  });

});