import { describe, it, expect, vi, beforeEach } from 'vitest';
import { TeamLeaderboardPageQuery } from './TeamLeaderboardPageQuery';
import { TeamService } from '@/lib/services/teams/TeamService';
import { Result } from '@/lib/contracts/Result';
import { TeamSummaryViewModel } from '@/lib/view-models/TeamSummaryViewModel';
import { mapToPresentationError } from '@/lib/contracts/page-queries/PresentationError';

// Mock dependencies
const mockGetAllTeams = vi.fn();
vi.mock('@/lib/services/teams/TeamService', () => {
  return {
    TeamService: class {
      getAllTeams = mockGetAllTeams;
    },
  };
});

vi.mock('@/lib/view-models/TeamSummaryViewModel', () => {
  const MockVm = vi.fn().mockImplementation(function(data) {
    return {
      ...data,
      equals: vi.fn(),
    };
  });
  return { TeamSummaryViewModel: MockVm };
});

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

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

  beforeEach(() => {
    vi.clearAllMocks();
    mockServiceInstance = {
      getAllTeams: mockGetAllTeams,
    };
    query = new TeamLeaderboardPageQuery(mockServiceInstance);
  });

  it('should return view data when service succeeds', async () => {
    const apiDto = [{ id: 'team-1', name: 'Test Team' }];

    mockServiceInstance.getAllTeams.mockResolvedValue(Result.ok(apiDto));

    const result = await query.execute();

    expect(result.isOk()).toBe(true);
    expect(result.unwrap().teams[0]).toMatchObject({ id: 'team-1', name: 'Test Team' });
    expect(mockServiceInstance.getAllTeams).toHaveBeenCalled();
    expect(TeamSummaryViewModel).toHaveBeenCalledWith({ id: 'team-1', name: 'Test Team' });
  });

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

    mockServiceInstance.getAllTeams.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 unknown error on exception', async () => {
    mockServiceInstance.getAllTeams.mockRejectedValue(new Error('Unexpected error'));

    const result = await query.execute();

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