import { describe, it, expect, beforeEach, vi, type Mock } from 'vitest';
import {
  GetTotalRacesUseCase,
  type GetTotalRacesInput,
  type GetTotalRacesResult,
  type GetTotalRacesErrorCode,
} from './GetTotalRacesUseCase';
import type { IRaceRepository } from '../../domain/repositories/IRaceRepository';
import type { Logger, UseCaseOutputPort } from '@core/shared/application';
import type { ApplicationErrorCode } from '@core/shared/errors/ApplicationErrorCode';

describe('GetTotalRacesUseCase', () => {
  let useCase: GetTotalRacesUseCase;
  let raceRepository: {
    findAll: Mock;
  };
  let logger: {
    debug: Mock;
    info: Mock;
    warn: Mock;
    error: Mock;
  };
  let output: UseCaseOutputPort<GetTotalRacesResult> & { present: Mock };

  beforeEach(() => {
    raceRepository = {
      findAll: vi.fn(),
    };
    logger = {
      debug: vi.fn(),
      info: vi.fn(),
      warn: vi.fn(),
      error: vi.fn(),
    };
    output = {
      present: vi.fn(),
    } as unknown as UseCaseOutputPort<GetTotalRacesResult> & { present: Mock };

    useCase = new GetTotalRacesUseCase(
      raceRepository as unknown as IRaceRepository,
      logger as unknown as Logger,
      output,
    );
  });

  it('should return total number of races', async () => {
    const races = [
      { id: 'race-1', name: 'Race 1' },
      { id: 'race-2', name: 'Race 2' },
    ];

    raceRepository.findAll.mockResolvedValue(races);

    const input: GetTotalRacesInput = {};

    const result = await useCase.execute(input);

    expect(result.isOk()).toBe(true);
    expect(result.unwrap()).toBeUndefined();
    expect(output.present).toHaveBeenCalledTimes(1);

    const payload = output.present.mock.calls[0][0] as GetTotalRacesResult;
    expect(payload.totalRaces).toBe(2);
  });

  it('should return error on repository failure', async () => {
    const repositoryError = new Error('Repository error');

    raceRepository.findAll.mockRejectedValue(repositoryError);

    const input: GetTotalRacesInput = {};

    const result = await useCase.execute(input);

    expect(result.isErr()).toBe(true);

    const errorResult = result.unwrapErr() as ApplicationErrorCode<
      GetTotalRacesErrorCode,
      { message: string }
    >;

    expect(errorResult.code).toBe('REPOSITORY_ERROR');
    expect(errorResult.details.message).toBe('Repository error');

    expect(output.present).not.toHaveBeenCalled();
  });
})