import { describe, it, expect, vi, beforeEach } from 'vitest';
import { JoinLeagueUseCase } from './JoinLeagueUseCase';
import type { LeagueRepository } from '../ports/LeagueRepository';
import type { DriverRepository } from '../../../racing/domain/repositories/DriverRepository';
import type { EventPublisher } from '../../../shared/ports/EventPublisher';
import type { JoinLeagueCommand } from '../ports/JoinLeagueCommand';

const mockLeagueRepository = {
  findById: vi.fn(),
  addPendingRequests: vi.fn(),
  addLeagueMembers: vi.fn(),
};

const mockDriverRepository = {
  findDriverById: vi.fn(),
};

const mockEventPublisher = {
  publish: vi.fn(),
};

describe('JoinLeagueUseCase', () => {
  let useCase: JoinLeagueUseCase;

  beforeEach(() => {
    // Reset mocks
    vi.clearAllMocks();

    useCase = new JoinLeagueUseCase(
      mockLeagueRepository as any,
      mockDriverRepository as any,
      mockEventPublisher as any
    );
  });

  describe('Scenario 1: League missing', () => {
    it('should throw "League not found" when league does not exist', async () => {
      // Given
      const command: JoinLeagueCommand = {
        leagueId: 'league-123',
        driverId: 'driver-456',
      };

      mockLeagueRepository.findById.mockImplementation(() => Promise.resolve(null));

      // When & Then
      await expect(useCase.execute(command)).rejects.toThrow('League not found');
      expect(mockLeagueRepository.findById).toHaveBeenCalledWith('league-123');
    });
  });

  describe('Scenario 2: Driver missing', () => {
    it('should throw "Driver not found" when driver does not exist', async () => {
      // Given
      const command: JoinLeagueCommand = {
        leagueId: 'league-123',
        driverId: 'driver-456',
      };

      const mockLeague = {
        id: 'league-123',
        name: 'Test League',
        description: null,
        visibility: 'public' as const,
        ownerId: 'owner-789',
        status: 'active' as const,
        createdAt: new Date(),
        updatedAt: new Date(),
        maxDrivers: null,
        approvalRequired: true,
        lateJoinAllowed: true,
        raceFrequency: null,
        raceDay: null,
        raceTime: null,
        tracks: null,
        scoringSystem: null,
        bonusPointsEnabled: false,
        penaltiesEnabled: false,
        protestsEnabled: false,
        appealsEnabled: false,
        stewardTeam: null,
        gameType: null,
        skillLevel: null,
        category: null,
        tags: null,
      };

      mockLeagueRepository.findById.mockImplementation(() => Promise.resolve(mockLeague));
      mockDriverRepository.findDriverById.mockImplementation(() => Promise.resolve(null));

      // When & Then
      await expect(useCase.execute(command)).rejects.toThrow('Driver not found');
      expect(mockLeagueRepository.findById).toHaveBeenCalledWith('league-123');
      expect(mockDriverRepository.findDriverById).toHaveBeenCalledWith('driver-456');
    });
  });

  describe('Scenario 3: approvalRequired path uses pending requests + time determinism', () => {
    it('should add pending request with deterministic time when approvalRequired is true', async () => {
      // Given
      const command: JoinLeagueCommand = {
        leagueId: 'league-123',
        driverId: 'driver-456',
      };

      const mockLeague = {
        id: 'league-123',
        name: 'Test League',
        description: null,
        visibility: 'public' as const,
        ownerId: 'owner-789',
        status: 'active' as const,
        createdAt: new Date(),
        updatedAt: new Date(),
        maxDrivers: null,
        approvalRequired: true,
        lateJoinAllowed: true,
        raceFrequency: null,
        raceDay: null,
        raceTime: null,
        tracks: null,
        scoringSystem: null,
        bonusPointsEnabled: false,
        penaltiesEnabled: false,
        protestsEnabled: false,
        appealsEnabled: false,
        stewardTeam: null,
        gameType: null,
        skillLevel: null,
        category: null,
        tags: null,
      };

      const mockDriver = {
        id: 'driver-456',
        name: 'Test Driver',
        iracingId: 'iracing-123',
        avatarUrl: null,
        createdAt: new Date(),
        updatedAt: new Date(),
      };

      // Freeze time for deterministic testing
      const frozenTime = new Date('2024-01-01T00:00:00.000Z');
      vi.setSystemTime(frozenTime);

      mockLeagueRepository.findById.mockResolvedValue(mockLeague);
      mockDriverRepository.findDriverById.mockResolvedValue(mockDriver);

      // When
      await useCase.execute(command);

      // Then
      expect(mockLeagueRepository.addPendingRequests).toHaveBeenCalledWith(
        'league-123',
        expect.arrayContaining([
          expect.objectContaining({
            id: expect.any(String),
            driverId: 'driver-456',
            name: 'Test Driver',
            requestDate: frozenTime,
          }),
        ])
      );

      // Verify no members were added
      expect(mockLeagueRepository.addLeagueMembers).not.toHaveBeenCalled();

      // Reset system time
      vi.useRealTimers();
    });
  });

  describe('Scenario 4: no-approval path adds member', () => {
    it('should add member when approvalRequired is false', async () => {
      // Given
      const command: JoinLeagueCommand = {
        leagueId: 'league-123',
        driverId: 'driver-456',
      };

      const mockLeague = {
        id: 'league-123',
        name: 'Test League',
        description: null,
        visibility: 'public' as const,
        ownerId: 'owner-789',
        status: 'active' as const,
        createdAt: new Date(),
        updatedAt: new Date(),
        maxDrivers: null,
        approvalRequired: false,
        lateJoinAllowed: true,
        raceFrequency: null,
        raceDay: null,
        raceTime: null,
        tracks: null,
        scoringSystem: null,
        bonusPointsEnabled: false,
        penaltiesEnabled: false,
        protestsEnabled: false,
        appealsEnabled: false,
        stewardTeam: null,
        gameType: null,
        skillLevel: null,
        category: null,
        tags: null,
      };

      const mockDriver = {
        id: 'driver-456',
        name: 'Test Driver',
        iracingId: 'iracing-123',
        avatarUrl: null,
        createdAt: new Date(),
        updatedAt: new Date(),
      };

      mockLeagueRepository.findById.mockResolvedValue(mockLeague);
      mockDriverRepository.findDriverById.mockResolvedValue(mockDriver);

      // When
      await useCase.execute(command);

      // Then
      expect(mockLeagueRepository.addLeagueMembers).toHaveBeenCalledWith(
        'league-123',
        expect.arrayContaining([
          expect.objectContaining({
            driverId: 'driver-456',
            name: 'Test Driver',
            role: 'member',
            joinDate: expect.any(Date),
          }),
        ])
      );

      // Verify no pending requests were added
      expect(mockLeagueRepository.addPendingRequests).not.toHaveBeenCalled();
    });
  });
});