import { beforeEach, describe, expect, it, vi, type Mock } from 'vitest';
import {
  SendFinalResultsUseCase,
  type SendFinalResultsInput,
  type SendFinalResultsResult,
  type SendFinalResultsErrorCode,
} from './SendFinalResultsUseCase';
import type { NotificationService } from '../../../notifications/application/ports/NotificationService';
import type { IRaceEventRepository } from '../../domain/repositories/IRaceEventRepository';
import type { IResultRepository } from '../../domain/repositories/IResultRepository';
import type { ILeagueRepository } from '../../domain/repositories/ILeagueRepository';
import type { ILeagueMembershipRepository } from '../../domain/repositories/ILeagueMembershipRepository';
import type { UseCaseOutputPort } from '@core/shared/application';
import type { ApplicationErrorCode } from '@core/shared/errors/ApplicationErrorCode';
import { Result } from '@core/shared/application/Result';
import type { Logger } from '@core/shared/application/Logger';

const unwrapError = (
  result: Result<void, ApplicationErrorCode<SendFinalResultsErrorCode, { message: string }>>,
): ApplicationErrorCode<SendFinalResultsErrorCode, { message: string }> => {
  expect(result.isErr()).toBe(true);
  return result.unwrapErr();
};

describe('SendFinalResultsUseCase', () => {
  let notificationService: { sendNotification: Mock };
  let raceEventRepository: { findById: Mock };
  let resultRepository: { findByRaceId: Mock };
  let leagueRepository: { findById: Mock };
  let membershipRepository: { getMembership: Mock };
  let logger: Logger;
  let output: UseCaseOutputPort<SendFinalResultsResult> & { present: Mock };
  let useCase: SendFinalResultsUseCase;

  beforeEach(() => {
    notificationService = { sendNotification: vi.fn() };
    raceEventRepository = { findById: vi.fn() };
    resultRepository = { findByRaceId: vi.fn() };
    leagueRepository = { findById: vi.fn() };
    membershipRepository = { getMembership: vi.fn() };
    logger = {
      debug: vi.fn(),
      info: vi.fn(),
      warn: vi.fn(),
      error: vi.fn(),
    };
    output = { present: vi.fn() } as unknown as UseCaseOutputPort<SendFinalResultsResult> & { present: Mock };

    useCase = new SendFinalResultsUseCase(
      notificationService as unknown as NotificationService,
      raceEventRepository as unknown as IRaceEventRepository,
      resultRepository as unknown as IResultRepository,
      leagueRepository as unknown as ILeagueRepository,
      membershipRepository as unknown as ILeagueMembershipRepository,
      logger,
      output,
    );
  });

  const createInput = (overrides: Partial<SendFinalResultsInput> = {}): SendFinalResultsInput => ({
    leagueId: 'league-1',
    raceId: 'race-1',
    triggeredById: 'user-1',
    ...overrides,
  });

  it('sends final results notifications to all participating drivers and presents result', async () => {
    const mockRaceEvent = {
      id: 'race-1',
      leagueId: 'league-1',
      name: 'Test Race',
      status: 'closed',
      getMainRaceSession: vi.fn().mockReturnValue({ id: 'session-1' }),
    };

    const mockLeague = { id: 'league-1' };
    const mockMembership = { role: 'steward' };

    leagueRepository.findById.mockResolvedValue(mockLeague);
    raceEventRepository.findById.mockResolvedValue(mockRaceEvent);
    membershipRepository.getMembership.mockResolvedValue(mockMembership);

    const mockResults = [
      {
        driverId: 'driver-1',
        position: 1,
        incidents: 0,
        getPositionChange: vi.fn().mockReturnValue(2),
      },
      {
        driverId: 'driver-2',
        position: 2,
        incidents: 1,
        getPositionChange: vi.fn().mockReturnValue(-1),
      },
    ];

    resultRepository.findByRaceId.mockResolvedValue(mockResults);

    const input = createInput();

    const result = await useCase.execute(input);

    expect(result.isOk()).toBe(true);
    expect(result.unwrap()).toBeUndefined();

    expect(leagueRepository.findById).toHaveBeenCalledWith('league-1');
    expect(raceEventRepository.findById).toHaveBeenCalledWith('race-1');
    expect(resultRepository.findByRaceId).toHaveBeenCalledWith('session-1');
    expect(notificationService.sendNotification).toHaveBeenCalledTimes(2);

    expect(output.present).toHaveBeenCalledTimes(1);
    const presented = output.present.mock.calls[0][0] as SendFinalResultsResult;
    expect(presented).toEqual({
      leagueId: 'league-1',
      raceId: 'race-1',
      notificationsSent: 2,
    });
  });

  it('returns LEAGUE_NOT_FOUND when league does not exist', async () => {
    leagueRepository.findById.mockResolvedValue(null);

    const result = await useCase.execute(createInput());

    const error = unwrapError(result);
    expect(error.code).toBe('LEAGUE_NOT_FOUND');
    expect(error.details?.message).toBe('League not found');
    expect(output.present).not.toHaveBeenCalled();
  });

  it('returns RACE_NOT_FOUND when race event does not exist', async () => {
    leagueRepository.findById.mockResolvedValue({ id: 'league-1' });
    raceEventRepository.findById.mockResolvedValue(null);

    const result = await useCase.execute(createInput());

    const error = unwrapError(result);
    expect(error.code).toBe('RACE_NOT_FOUND');
    expect(error.details?.message).toBe('Race event not found');
    expect(output.present).not.toHaveBeenCalled();
  });

  it('returns INSUFFICIENT_PERMISSIONS when user is not steward or higher', async () => {
    leagueRepository.findById.mockResolvedValue({ id: 'league-1' });
    raceEventRepository.findById.mockResolvedValue({ id: 'race-1', leagueId: 'league-1', status: 'closed' });
    membershipRepository.getMembership.mockResolvedValue(null);

    const result = await useCase.execute(createInput());

    const error = unwrapError(result);
    expect(error.code).toBe('INSUFFICIENT_PERMISSIONS');
    expect(error.details?.message).toBe('Insufficient permissions to send final results');
    expect(output.present).not.toHaveBeenCalled();
  });

  it('returns RESULTS_NOT_FINAL when race is not closed', async () => {
    leagueRepository.findById.mockResolvedValue({ id: 'league-1' });
    raceEventRepository.findById.mockResolvedValue({
      id: 'race-1',
      leagueId: 'league-1',
      name: 'Test Race',
      status: 'in_progress',
      getMainRaceSession: vi.fn(),
    });

    const result = await useCase.execute(createInput());

    const error = unwrapError(result);
    expect(error.code).toBe('RESULTS_NOT_FINAL');
    expect(error.details?.message).toBe('Race results are not in a final state');
    expect(output.present).not.toHaveBeenCalled();
  });

  it('returns RESULTS_NOT_FINAL when main race session is missing', async () => {
    leagueRepository.findById.mockResolvedValue({ id: 'league-1' });
    raceEventRepository.findById.mockResolvedValue({
      id: 'race-1',
      leagueId: 'league-1',
      name: 'Test Race',
      status: 'closed',
      getMainRaceSession: vi.fn().mockReturnValue(undefined),
    });

    const result = await useCase.execute(createInput());

    const error = unwrapError(result);
    expect(error.code).toBe('RESULTS_NOT_FINAL');
    expect(error.details?.message).toBe('Main race session not found for race event');
    expect(output.present).not.toHaveBeenCalled();
  });

  it('wraps repository errors into REPOSITORY_ERROR and does not present output', async () => {
    const mockError = new Error('Repository failure');
    leagueRepository.findById.mockRejectedValue(mockError);

    const result = await useCase.execute(createInput());

    const error = unwrapError(result);
    expect(error.code).toBe('REPOSITORY_ERROR');
    expect(error.details?.message).toBe('Repository failure');
    expect(output.present).not.toHaveBeenCalled();
    expect(logger.error).toHaveBeenCalled();
  });
});