import { Test, TestingModule } from '@nestjs/testing';
import {
  NotFoundException,
  BadRequestException,
} from '@nestjs/common';
import { ShareService } from './share.service';
import { ShareConfigRepository } from './repositories/share-config.repository';
import { ShareParticipantRepository } from './repositories/share-participant.repository';
import { ShareLevelProgressRepository } from './repositories/share-level-progress.repository';
import { LevelRepository } from '../wechat-game/repositories/level.repository';
import { Level } from '../wechat-game/entities/level.entity';
import { ShareConfig } from './entities/share-config.entity';
import { ShareParticipant } from './entities/share-participant.entity';
import { ShareLevelProgress } from './entities/share-level-progress.entity';

// Mock nanoid to return predictable values
jest.mock('nanoid', () => ({
  nanoid: jest.fn(() => 'ABCD1234'),
}));

describe('ShareService', () => {
  let service: ShareService;

  const mockLevels: Level[] = Array.from({ length: 6 }, (_, i) => ({
    id: `level-${i + 1}`,
    imageUrl: `https://example.com/meme${i + 1}.jpg`,
    answer: `答案${i + 1}`,
    hint1: `提示${i + 1}`,
    hint2: null,
    hint3: null,
    sortOrder: i,
    timeLimit: i === 0 ? 60 : null,
    createdAt: new Date('2026-01-01'),
    updatedAt: new Date('2026-01-01'),
  }));

  const mockShareConfig: ShareConfig = {
    id: 'share-uuid-1',
    shareCode: 'ABCD1234',
    title: '我的挑战',
    sharerId: 'user-uuid-1',
    levelIds: mockLevels.map((l) => l.id),
    sharer: {} as any,
    participants: [],
    createdAt: new Date('2026-01-01'),
    updatedAt: new Date('2026-01-01'),
  };

  const mockParticipant: ShareParticipant = {
    id: 'participant-uuid-1',
    shareConfigId: 'share-uuid-1',
    participantId: 'user-uuid-2',
    shareConfig: {} as any,
    participant: {} as any,
    createdAt: new Date('2026-01-01'),
  };

  const mockShareConfigRepository = {
    create: jest.fn(),
    findByShareCode: jest.fn(),
  };

  const mockShareParticipantRepository = {
    addParticipant: jest.fn(),
    countByShareConfigId: jest.fn(),
    findByShareConfigAndParticipant: jest.fn(),
    create: jest.fn(),
    save: jest.fn(),
  };

  const mockShareLevelProgressRepository = {
    findByParticipantAndLevel: jest.fn(),
    create: jest.fn(),
    save: jest.fn(),
  };

  const mockLevelRepository = {
    findByIds: jest.fn(),
    findById: jest.fn(),
  };

  beforeEach(async () => {
    const module: TestingModule = await Test.createTestingModule({
      providers: [
        ShareService,
        { provide: ShareConfigRepository, useValue: mockShareConfigRepository },
        {
          provide: ShareParticipantRepository,
          useValue: mockShareParticipantRepository,
        },
        {
          provide: ShareLevelProgressRepository,
          useValue: mockShareLevelProgressRepository,
        },
        { provide: LevelRepository, useValue: mockLevelRepository },
      ],
    }).compile();

    service = module.get<ShareService>(ShareService);
  });

  afterEach(() => {
    jest.clearAllMocks();
  });

  describe('createShare', () => {
    const createDto = {
      title: '我的挑战',
      levelIds: ['level-1', 'level-2', 'level-3', 'level-4', 'level-5', 'level-6'],
    };

    it('should create a share with valid 6 unique levels', async () => {
      mockLevelRepository.findByIds.mockResolvedValue(mockLevels);
      mockShareConfigRepository.findByShareCode.mockResolvedValue(null);
      mockShareConfigRepository.create.mockResolvedValue(mockShareConfig);

      const result = await service.createShare('user-uuid-1', createDto);

      expect(result.shareCode).toBe('ABCD1234');
      expect(result.title).toBe('我的挑战');
      expect(result.levelCount).toBe(6);
    });

    it('should throw BadRequestException when level IDs have duplicates', async () => {
      const duplicateDto = {
        title: '测试',
        levelIds: ['level-1', 'level-1', 'level-2', 'level-3', 'level-4', 'level-5'],
      };

      await expect(
        service.createShare('user-uuid-1', duplicateDto),
      ).rejects.toThrow(BadRequestException);
    });

    it('should throw NotFoundException when some levels do not exist', async () => {
      mockLevelRepository.findByIds.mockResolvedValue(mockLevels.slice(0, 4));

      await expect(
        service.createShare('user-uuid-1', createDto),
      ).rejects.toThrow(NotFoundException);
    });

    it('should throw BadRequestException when share code generation fails', async () => {
      mockLevelRepository.findByIds.mockResolvedValue(mockLevels);
      // All 3 attempts find existing codes
      mockShareConfigRepository.findByShareCode.mockResolvedValue(
        mockShareConfig,
      );

      await expect(
        service.createShare('user-uuid-1', createDto),
      ).rejects.toThrow(BadRequestException);
    });
  });

  describe('joinShare', () => {
    it('should return share details with ordered levels for a participant', async () => {
      mockShareConfigRepository.findByShareCode.mockResolvedValue(
        mockShareConfig,
      );
      mockShareParticipantRepository.addParticipant.mockResolvedValue(undefined);
      mockLevelRepository.findByIds.mockResolvedValue(mockLevels);

      const result = await service.joinShare('user-uuid-2', 'ABCD1234');

      expect(result.shareCode).toBe('ABCD1234');
      expect(result.title).toBe('我的挑战');
      expect(result.levels).toHaveLength(6);
      expect(result.levels[0].level).toBe(1);
      expect(result.levels[0].id).toBe('level-1');
      expect(mockShareParticipantRepository.addParticipant).toHaveBeenCalledWith(
        'share-uuid-1',
        'user-uuid-2',
      );
    });

    it('should not add participant when user is the sharer', async () => {
      mockShareConfigRepository.findByShareCode.mockResolvedValue(
        mockShareConfig,
      );
      mockLevelRepository.findByIds.mockResolvedValue(mockLevels);

      const result = await service.joinShare('user-uuid-1', 'ABCD1234');

      expect(result.shareCode).toBe('ABCD1234');
      expect(
        mockShareParticipantRepository.addParticipant,
      ).not.toHaveBeenCalled();
    });

    it('should throw NotFoundException when share code not found', async () => {
      mockShareConfigRepository.findByShareCode.mockResolvedValue(null);

      await expect(
        service.joinShare('user-uuid-2', 'INVALID'),
      ).rejects.toThrow(NotFoundException);
    });
  });

  describe('reportLevelProgress', () => {
    const reportDto = {
      shareCode: 'ABCD1234',
      levelId: 'level-1',
      passed: true,
      timeSpent: 30,
    };

    it('should create new progress record for first attempt', async () => {
      const levelWithTimeLimit = { ...mockLevels[0], timeLimit: 60 };
      mockShareConfigRepository.findByShareCode.mockResolvedValue(
        mockShareConfig,
      );
      mockLevelRepository.findById.mockResolvedValue(levelWithTimeLimit);
      mockShareParticipantRepository.findByShareConfigAndParticipant.mockResolvedValue(
        mockParticipant,
      );
      mockShareLevelProgressRepository.findByParticipantAndLevel.mockResolvedValue(
        null,
      );
      const newProgress: Partial<ShareLevelProgress> = {
        participantId: 'participant-uuid-1',
        levelId: 'level-1',
        passed: true,
        timeSpent: 30,
      };
      mockShareLevelProgressRepository.create.mockReturnValue(newProgress);
      mockShareLevelProgressRepository.save.mockResolvedValue(newProgress);

      const result = await service.reportLevelProgress(
        'user-uuid-2',
        reportDto,
      );

      expect(result.passed).toBe(true);
      expect(result.timeLimit).toBe(60);
      expect(result.withinTimeLimit).toBe(true);
    });

    it('should return existing result when already passed (idempotent)', async () => {
      const levelWithTimeLimit = { ...mockLevels[0], timeLimit: 60 };
      mockShareConfigRepository.findByShareCode.mockResolvedValue(
        mockShareConfig,
      );
      mockLevelRepository.findById.mockResolvedValue(levelWithTimeLimit);
      mockShareParticipantRepository.findByShareConfigAndParticipant.mockResolvedValue(
        mockParticipant,
      );
      mockShareLevelProgressRepository.findByParticipantAndLevel.mockResolvedValue(
        {
          id: 'progress-uuid-1',
          participantId: 'participant-uuid-1',
          levelId: 'level-1',
          passed: true,
          timeSpent: 25,
          completedAt: new Date(),
        } as ShareLevelProgress,
      );

      const result = await service.reportLevelProgress(
        'user-uuid-2',
        reportDto,
      );

      expect(result.passed).toBe(true);
      expect(result.withinTimeLimit).toBe(true);
      expect(mockShareLevelProgressRepository.save).not.toHaveBeenCalled();
    });

    it('should report withinTimeLimit=false when time exceeds limit', async () => {
      const levelWithTimeLimit = { ...mockLevels[0], timeLimit: 20 };
      mockShareConfigRepository.findByShareCode.mockResolvedValue(
        mockShareConfig,
      );
      mockLevelRepository.findById.mockResolvedValue(levelWithTimeLimit);
      mockShareParticipantRepository.findByShareConfigAndParticipant.mockResolvedValue(
        mockParticipant,
      );
      mockShareLevelProgressRepository.findByParticipantAndLevel.mockResolvedValue(
        null,
      );
      const newProgress: Partial<ShareLevelProgress> = {
        participantId: 'participant-uuid-1',
        levelId: 'level-1',
        passed: true,
        timeSpent: 30,
      };
      mockShareLevelProgressRepository.create.mockReturnValue(newProgress);
      mockShareLevelProgressRepository.save.mockResolvedValue(newProgress);

      const result = await service.reportLevelProgress('user-uuid-2', {
        ...reportDto,
        timeSpent: 30,
      });

      expect(result.passed).toBe(true);
      expect(result.withinTimeLimit).toBe(false);
    });

    it('should report withinTimeLimit=true when level has no time limit', async () => {
      const levelNoTimeLimit = { ...mockLevels[1], timeLimit: null };
      mockShareConfigRepository.findByShareCode.mockResolvedValue(
        mockShareConfig,
      );
      mockLevelRepository.findById.mockResolvedValue(levelNoTimeLimit);
      mockShareParticipantRepository.findByShareConfigAndParticipant.mockResolvedValue(
        mockParticipant,
      );
      mockShareLevelProgressRepository.findByParticipantAndLevel.mockResolvedValue(
        null,
      );
      const newProgress: Partial<ShareLevelProgress> = {
        participantId: 'participant-uuid-1',
        levelId: 'level-2',
        passed: true,
        timeSpent: 999,
      };
      mockShareLevelProgressRepository.create.mockReturnValue(newProgress);
      mockShareLevelProgressRepository.save.mockResolvedValue(newProgress);

      const result = await service.reportLevelProgress('user-uuid-2', {
        shareCode: 'ABCD1234',
        levelId: 'level-2',
        passed: true,
        timeSpent: 999,
      });

      expect(result.withinTimeLimit).toBe(true);
    });

    it('should create participant if not exists when reporting progress', async () => {
      mockShareConfigRepository.findByShareCode.mockResolvedValue(
        mockShareConfig,
      );
      mockLevelRepository.findById.mockResolvedValue(mockLevels[0]);
      mockShareParticipantRepository.findByShareConfigAndParticipant.mockResolvedValue(
        null,
      );
      const createdParticipant = { ...mockParticipant };
      mockShareParticipantRepository.create.mockReturnValue(createdParticipant);
      mockShareParticipantRepository.save.mockResolvedValue(createdParticipant);
      mockShareLevelProgressRepository.findByParticipantAndLevel.mockResolvedValue(
        null,
      );
      mockShareLevelProgressRepository.create.mockReturnValue({} as any);
      mockShareLevelProgressRepository.save.mockResolvedValue({} as any);

      await service.reportLevelProgress('user-uuid-2', reportDto);

      expect(mockShareParticipantRepository.create).toHaveBeenCalledWith({
        shareConfigId: 'share-uuid-1',
        participantId: 'user-uuid-2',
      });
      expect(mockShareParticipantRepository.save).toHaveBeenCalled();
    });

    it('should throw NotFoundException when share not found', async () => {
      mockShareConfigRepository.findByShareCode.mockResolvedValue(null);

      await expect(
        service.reportLevelProgress('user-uuid-2', reportDto),
      ).rejects.toThrow(NotFoundException);
    });

    it('should throw NotFoundException when level not found', async () => {
      mockShareConfigRepository.findByShareCode.mockResolvedValue(
        mockShareConfig,
      );
      mockLevelRepository.findById.mockResolvedValue(null);

      await expect(
        service.reportLevelProgress('user-uuid-2', reportDto),
      ).rejects.toThrow(NotFoundException);
    });

    it('should update existing progress when not yet passed', async () => {
      mockShareConfigRepository.findByShareCode.mockResolvedValue(
        mockShareConfig,
      );
      mockLevelRepository.findById.mockResolvedValue(mockLevels[0]);
      mockShareParticipantRepository.findByShareConfigAndParticipant.mockResolvedValue(
        mockParticipant,
      );
      const existingProgress = {
        id: 'progress-uuid-1',
        participantId: 'participant-uuid-1',
        levelId: 'level-1',
        passed: false,
        timeSpent: 15,
        completedAt: new Date('2026-01-01'),
      } as ShareLevelProgress;
      mockShareLevelProgressRepository.findByParticipantAndLevel.mockResolvedValue(
        existingProgress,
      );
      mockShareLevelProgressRepository.save.mockResolvedValue({
        ...existingProgress,
        passed: true,
        timeSpent: 30,
      });

      const result = await service.reportLevelProgress(
        'user-uuid-2',
        reportDto,
      );

      expect(result.passed).toBe(true);
      expect(mockShareLevelProgressRepository.save).toHaveBeenCalled();
    });
  });
});