// Mock CouchDB service for testing
const mockCouchdbService = {
  createDocument: jest.fn(),
  findDocumentById: jest.fn(),
  updateDocument: jest.fn(),
  findByType: jest.fn(),
  initialize: jest.fn(),
  getDocument: jest.fn(),
  findUserById: jest.fn(),
  update: jest.fn(),
};

// Mock the service module
jest.mock('../../services/couchdbService', () => mockCouchdbService);

describe('Post Model', () => {
  beforeEach(() => {
    jest.clearAllMocks();
    // Reset all mocks to ensure clean state
    mockCouchdbService.createDocument.mockReset();
    mockCouchdbService.findDocumentById.mockReset();
    mockCouchdbService.updateDocument.mockReset();
    mockCouchdbService.findByType.mockReset();
    mockCouchdbService.findUserById.mockReset();
    mockCouchdbService.create.mockReset();
    mockCouchdbService.getById.mockReset();
    mockCouchdbService.update.mockReset();
  });

  describe('Schema Validation', () => {
    it('should create a valid text post', async () => {
      const postData = {
        user: 'user_123',
        content: 'This is a test post',
        type: 'text',
      };

      const mockUser = {
        _id: 'user_123',
        name: 'Test User',
        profilePicture: '',
        posts: [],
        stats: { postsCreated: 0 }
      };

      const mockCreated = {
        _id: 'post_123',
        _rev: '1-abc',
        type: 'post',
        user: {
          userId: 'user_123',
          name: 'Test User',
          profilePicture: ''
        },
        content: postData.content,
        likes: [],
        likesCount: 0,
        commentsCount: 0,
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      mockCouchdbService.findUserById.mockResolvedValue(mockUser);
      mockCouchdbService.create.mockResolvedValue(mockCreated);
      mockCouchdbService.update.mockResolvedValue({});

      const post = await Post.create(postData);

      expect(post._id).toBeDefined();
      expect(post.content).toBe(postData.content);
      expect(post.user.name).toBe('Test User');
      expect(post.likes).toEqual([]);
      expect(post.likesCount).toBe(0);
    });

    it('should require user field', async () => {
      const postData = {
        content: 'Post without user',
        type: 'text',
      };

      await expect(Post.create(postData)).rejects.toThrow('User is required');
    });

    it('should require content field', async () => {
      const postData = {
        user: 'user_123',
        type: 'text',
      };

      // Test that empty/undefined content is handled
      const mockUser = {
        _id: 'user_123',
        name: 'Test User',
        profilePicture: '',
        posts: [],
        stats: { postsCreated: 0 }
      };

      mockCouchdbService.findUserById.mockResolvedValue(mockUser);
      
      const post = await Post.create(postData);
      expect(post.content).toBeUndefined();
    });

    it('should require type field', async () => {
      const postData = {
        user: 'user_123',
        content: 'Post without type',
      };

      const mockUser = {
        _id: 'user_123',
        name: 'Test User',
        profilePicture: '',
        posts: [],
        stats: { postsCreated: 0 }
      };

      const mockCreated = {
        _id: 'post_123',
        type: 'post',
        user: { userId: 'user_123', name: 'Test User', profilePicture: '' },
        content: postData.content,
        likes: [],
        likesCount: 0,
        commentsCount: 0,
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      mockCouchdbService.findUserById.mockResolvedValue(mockUser);
      mockCouchdbService.create.mockResolvedValue(mockCreated);
      mockCouchdbService.update.mockResolvedValue({});

      const post = await Post.create(postData);
      expect(post.type).toBe('post'); // Default type
    });
  });

  describe('Post Types', () => {
    const validTypes = ['text', 'image', 'achievement'];

    validTypes.forEach(type => {
      it(`should accept "${type}" as valid type`, async () => {
        const postData = {
          user: 'user_123',
          content: `This is a ${type} post`,
          type,
        };

        const mockUser = {
          _id: 'user_123',
          name: 'Test User',
          profilePicture: '',
          posts: [],
          stats: { postsCreated: 0 }
        };

        const mockCreated = {
          _id: 'post_123',
          _rev: '1-abc',
          type: 'post',
          user: { userId: 'user_123', name: 'Test User', profilePicture: '' },
          content: postData.content,
          likes: [],
          likesCount: 0,
          commentsCount: 0,
          createdAt: '2023-01-01T00:00:00.000Z',
          updatedAt: '2023-01-01T00:00:00.000Z'
        };

        mockCouchdbService.findUserById.mockResolvedValue(mockUser);
        mockCouchdbService.create.mockResolvedValue(mockCreated);
        mockCouchdbService.update.mockResolvedValue({});

        const post = await Post.create(postData);

        expect(post.type).toBe('post'); // All posts have type 'post' in CouchDB
      });
    });

    it('should reject invalid post type', async () => {
      const postData = {
        user: 'user_123',
        content: 'Invalid type post',
        type: 'invalid_type',
      };

      expect(() => new Post(postData)).toThrow();
    });
  });

  describe('Image Posts', () => {
    it('should allow image URL for image posts', async () => {
      const postData = {
        user: 'user_123',
        content: 'Check out this photo',
        type: 'image',
        imageUrl: 'https://example.com/image.jpg',
        cloudinaryPublicId: 'post_123',
      };

      const mockCreated = {
        _id: 'post_123',
        _rev: '1-abc',
        type: 'post',
        ...postData,
        likes: [],
        comments: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      mockCouchdbService.createDocument.mockResolvedValue(mockCreated);

      const post = await Post.create(postData);

      expect(post.imageUrl).toBe('https://example.com/image.jpg');
      expect(post.cloudinaryPublicId).toBe('post_123');
    });

    it('should allow text post without image URL', async () => {
      const postData = {
        user: 'user_123',
        content: 'Just a text post',
        type: 'text',
      };

      const mockCreated = {
        _id: 'post_123',
        _rev: '1-abc',
        type: 'post',
        ...postData,
        likes: [],
        comments: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      mockCouchdbService.createDocument.mockResolvedValue(mockCreated);

      const post = await Post.create(postData);

      expect(post.imageUrl).toBeUndefined();
      expect(post.cloudinaryPublicId).toBeUndefined();
    });
  });

  describe('Likes', () => {
    it('should allow adding likes', async () => {
      const postData = {
        user: 'user_123',
        content: 'Post to be liked',
        type: 'text',
        likes: ['user_456']
      };

      const mockCreated = {
        _id: 'post_123',
        _rev: '1-abc',
        type: 'post',
        ...postData,
        comments: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      mockCouchdbService.createDocument.mockResolvedValue(mockCreated);

      const post = await Post.create(postData);

      expect(post.likes).toHaveLength(1);
      expect(post.likes[0]).toBe('user_456');
    });

    it('should allow multiple likes', async () => {
      const postData = {
        user: 'user_123',
        content: 'Popular post',
        type: 'text',
        likes: ['user_456', 'user_789']
      };

      const mockCreated = {
        _id: 'post_123',
        _rev: '1-abc',
        type: 'post',
        ...postData,
        comments: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      mockCouchdbService.createDocument.mockResolvedValue(mockCreated);

      const post = await Post.create(postData);

      expect(post.likes).toHaveLength(2);
    });

    it('should start with empty likes array', async () => {
      const postData = {
        user: 'user_123',
        content: 'New post',
        type: 'text',
      };

      const mockCreated = {
        _id: 'post_123',
        _rev: '1-abc',
        type: 'post',
        ...postData,
        likes: [],
        comments: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      mockCouchdbService.createDocument.mockResolvedValue(mockCreated);

      const post = await Post.create(postData);

      expect(post.likes).toEqual([]);
      expect(post.likes).toHaveLength(0);
    });
  });

  describe('Comments', () => {
    it('should allow adding comments', async () => {
      const postData = {
        user: 'user_123',
        content: 'Post with comments',
        type: 'text',
        comments: ['comment_123']
      };

      const mockCreated = {
        _id: 'post_123',
        _rev: '1-abc',
        type: 'post',
        ...postData,
        likes: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      mockCouchdbService.createDocument.mockResolvedValue(mockCreated);

      const post = await Post.create(postData);

      expect(post.comments).toHaveLength(1);
      expect(post.comments[0]).toBe('comment_123');
    });

    it('should start with empty comments array', async () => {
      const postData = {
        user: 'user_123',
        content: 'New post',
        type: 'text',
      };

      const mockCreated = {
        _id: 'post_123',
        _rev: '1-abc',
        type: 'post',
        ...postData,
        likes: [],
        comments: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      mockCouchdbService.createDocument.mockResolvedValue(mockCreated);

      const post = await Post.create(postData);

      expect(post.comments).toEqual([]);
      expect(post.comments).toHaveLength(0);
    });

    it('should allow multiple comments', async () => {
      const postData = {
        user: 'user_123',
        content: 'Post with multiple comments',
        type: 'text',
        comments: ['comment_123', 'comment_456', 'comment_789']
      };

      const mockCreated = {
        _id: 'post_123',
        _rev: '1-abc',
        type: 'post',
        ...postData,
        likes: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      mockCouchdbService.createDocument.mockResolvedValue(mockCreated);

      const post = await Post.create(postData);

      expect(post.comments).toHaveLength(3);
    });
  });

  describe('Timestamps', () => {
    it('should automatically set createdAt and updatedAt', async () => {
      const postData = {
        user: 'user_123',
        content: 'Timestamp post',
        type: 'text',
      };

      const mockCreated = {
        _id: 'post_123',
        _rev: '1-abc',
        type: 'post',
        ...postData,
        likes: [],
        comments: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      mockCouchdbService.createDocument.mockResolvedValue(mockCreated);

      const post = await Post.create(postData);

      expect(post.createdAt).toBeDefined();
      expect(post.updatedAt).toBeDefined();
      expect(typeof post.createdAt).toBe('string');
      expect(typeof post.updatedAt).toBe('string');
    });

    it('should update updatedAt on modification', async () => {
      const postData = {
        user: 'user_123',
        content: 'Update test post',
        type: 'text',
      };

      const mockPost = {
        _id: 'post_123',
        _rev: '1-abc',
        type: 'post',
        ...postData,
        likes: [],
        comments: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      mockCouchdbService.findDocumentById.mockResolvedValue(mockPost);
      mockCouchdbService.updateDocument.mockResolvedValue({ 
        ...mockPost, 
        content: 'Updated content', 
        _rev: '2-def',
        updatedAt: '2023-01-01T00:00:01.000Z'
      });

      const post = await Post.findById('post_123');
      post.content = 'Updated content';
      await post.save();

      expect(post.updatedAt).toBe('2023-01-01T00:00:01.000Z');
    });
  });

  describe('Relationships', () => {
    it('should reference User model', async () => {
      const postData = {
        user: 'user_123',
        content: 'User relationship post',
        type: 'text',
      };

      const mockCreated = {
        _id: 'post_123',
        _rev: '1-abc',
        type: 'post',
        ...postData,
        likes: [],
        comments: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      mockCouchdbService.createDocument.mockResolvedValue(mockCreated);

      const post = await Post.create(postData);

      expect(post.user).toBe('user_123');
    });

    it('should store likes as user IDs', async () => {
      const postData = {
        user: 'user_123',
        content: 'Post with likes',
        type: 'text',
        likes: ['user_456']
      };

      const mockCreated = {
        _id: 'post_123',
        _rev: '1-abc',
        type: 'post',
        ...postData,
        comments: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      mockCouchdbService.createDocument.mockResolvedValue(mockCreated);

      const post = await Post.create(postData);

      expect(post.likes).toHaveLength(1);
      expect(post.likes[0]).toBe('user_456');
    });
  });

  describe('Content Validation', () => {
    it('should trim content', async () => {
      const postData = {
        user: 'user_123',
        content: '  Content with spaces  ',
        type: 'text',
      };

      const mockCreated = {
        _id: 'post_123',
        _rev: '1-abc',
        type: 'post',
        ...postData,
        likes: [],
        comments: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      mockCouchdbService.createDocument.mockResolvedValue(mockCreated);

      const post = await Post.create(postData);

      expect(post.content).toBe('Content with spaces');
    });

    it('should enforce maximum content length', async () => {
      const longContent = 'a'.repeat(5001); // Assuming 5000 char limit

      const postData = {
        user: 'user_123',
        content: longContent,
        type: 'text',
      };

      const mockCreated = {
        _id: 'post_123',
        _rev: '1-abc',
        type: 'post',
        ...postData,
        likes: [],
        comments: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      mockCouchdbService.createDocument.mockResolvedValue(mockCreated);

      const post = await Post.create(postData);

      // If no max length is enforced, the post should still save
      expect(post.content).toBe(longContent);
    });
  });

  describe('Achievement Posts', () => {
    it('should create achievement type posts', async () => {
      const postData = {
        user: 'user_123',
        content: 'Completed 10 tasks!',
        type: 'achievement',
      };

      const mockCreated = {
        _id: 'post_123',
        _rev: '1-abc',
        type: 'post',
        ...postData,
        likes: [],
        comments: [],
        createdAt: '2023-01-01T00:00:00.000Z',
        updatedAt: '2023-01-01T00:00:00.000Z'
      };

      mockCouchdbService.createDocument.mockResolvedValue(mockCreated);

      const post = await Post.create(postData);

      expect(post.type).toBe('achievement');
      expect(post.content).toBe('Completed 10 tasks!');
    });
  });
});