import { describe, it, expect, vi, beforeEach } from 'vitest';
import { LeaderboardsPageQuery } from './LeaderboardsPageQuery';
import { LeaderboardsService } from '@/lib/services/leaderboards/LeaderboardsService';
import { Result } from '@/lib/contracts/Result';
import { LeaderboardsViewDataBuilder } from '@/lib/builders/view-data/LeaderboardsViewDataBuilder';
import { mapToPresentationError } from '@/lib/contracts/page-queries/PresentationError';

// Mock dependencies
vi.mock('@/lib/services/leaderboards/LeaderboardsService', () => ({
  LeaderboardsService: vi.fn().mockImplementation(function (this: any) {
    this.getLeaderboards = vi.fn();
  }),
}));

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

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

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

  beforeEach(() => {
    vi.clearAllMocks();
    query = new LeaderboardsPageQuery();
    mockServiceInstance = {
      getLeaderboards: vi.fn(),
    };
    (LeaderboardsService as any).mockImplementation(function (this: any) {
      return mockServiceInstance;
    });
  });

  it('should return view data when service succeeds', async () => {
    const apiDto = { some: 'leaderboard-data' };
    const viewData = { transformed: 'leaderboard-view' } as any;

    mockServiceInstance.getLeaderboards.mockResolvedValue(Result.ok(apiDto));
    (LeaderboardsViewDataBuilder.build as any).mockReturnValue(viewData);

    const result = await query.execute();

    expect(result.isOk()).toBe(true);
    expect(result.unwrap()).toEqual(viewData);
    expect(LeaderboardsService).toHaveBeenCalled();
    expect(mockServiceInstance.getLeaderboards).toHaveBeenCalled();
    expect(LeaderboardsViewDataBuilder.build).toHaveBeenCalledWith(apiDto);
  });

  it('should return mapped presentation error when service fails', async () => {
    const serviceError = 'some-domain-error';
    const presentationError = 'some-presentation-error';

    mockServiceInstance.getLeaderboards.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 provide a static execute method', async () => {
    const apiDto = { some: 'leaderboard-data' };
    const viewData = { transformed: 'leaderboard-view' } as any;

    mockServiceInstance.getLeaderboards.mockResolvedValue(Result.ok(apiDto));
    (LeaderboardsViewDataBuilder.build as any).mockReturnValue(viewData);

    const result = await LeaderboardsPageQuery.execute();

    expect(result.isOk()).toBe(true);
    expect(result.unwrap()).toEqual(viewData);
  });
});