/**
 * Simple middleware unit tests without complex dependencies
 */

describe('Middleware Functions', () => {
  // Mock error handler middleware
  const createErrorMiddleware = () => {
    return (err, req, res, next) => {
      const statusCode = err.statusCode || err.status || 500;
      const message = err.message || 'Internal Server Error';
      
      res.status(statusCode).json({
        success: false,
        error: {
          message,
          code: err.code || 'INTERNAL_ERROR',
          timestamp: new Date().toISOString()
        }
      });
    };
  };

  // Mock validation middleware
  const createValidationMiddleware = (schema) => {
    return (req, res, next) => {
      const { error } = schema.validate(req.body);
      if (error) {
        return res.status(400).json({
          success: false,
          error: {
            message: error.details[0].message,
            code: 'VALIDATION_ERROR'
          }
        });
      }
      next();
    };
  };

  // Mock rate limiting middleware
  const createRateLimitMiddleware = (options = {}) => {
    const requests = new Map();
    const windowMs = options.windowMs || 60000;
    const maxRequests = options.maxRequests || 100;

    return (req, res, next) => {
      const key = req.ip || 'default';
      const now = Date.now();
      
      if (!requests.has(key)) {
        requests.set(key, []);
      }
      
      const userRequests = requests.get(key);
      const recentRequests = userRequests.filter(time => now - time < windowMs);
      
      if (recentRequests.length >= maxRequests) {
        return res.status(429).json({
          success: false,
          error: {
            message: 'Too many requests',
            code: 'RATE_LIMIT_ERROR'
          }
        });
      }
      
      recentRequests.push(now);
      requests.set(key, recentRequests);
      next();
    };
  };

  describe('Error handling middleware', () => {
    test('should handle basic errors', () => {
      const errorMiddleware = createErrorMiddleware();
      const mockReq = global.createMockRequest();
      const mockRes = global.createMockResponse();
      const mockNext = global.createMockNext();

      const testError = new Error('Test error message');
      testError.statusCode = 400;
      testError.code = 'TEST_ERROR';

      errorMiddleware(testError, mockReq, mockRes, mockNext);

      expect(mockRes.status).toHaveBeenCalledWith(400);
      expect(mockRes.json).toHaveBeenCalledWith({
        success: false,
        error: {
          message: 'Test error message',
          code: 'TEST_ERROR',
          timestamp: expect.any(String)
        }
      });
    });

    test('should handle errors without status codes', () => {
      const errorMiddleware = createErrorMiddleware();
      const mockReq = global.createMockRequest();
      const mockRes = global.createMockResponse();
      const mockNext = global.createMockNext();

      const testError = new Error('Generic error');

      errorMiddleware(testError, mockReq, mockRes, mockNext);

      expect(mockRes.status).toHaveBeenCalledWith(500);
      expect(mockRes.json).toHaveBeenCalledWith(
        expect.objectContaining({
          success: false,
          error: expect.objectContaining({
            message: 'Generic error',
            code: 'INTERNAL_ERROR'
          })
        })
      );
    });

    test('should include timestamp in error response', () => {
      const errorMiddleware = createErrorMiddleware();
      const mockReq = global.createMockRequest();
      const mockRes = global.createMockResponse();
      const mockNext = global.createMockNext();

      const testError = new Error('Timestamp test');
      errorMiddleware(testError, mockReq, mockRes, mockNext);

      const callArgs = mockRes.json.mock.calls[0][0];
      expect(callArgs.error.timestamp).toBeDefined();
      expect(new Date(callArgs.error.timestamp)).toBeInstanceOf(Date);
    });
  });

  describe('Validation middleware', () => {
    test('should pass valid requests', () => {
      const mockSchema = {
        validate: jest.fn().mockReturnValue({ error: null })
      };
      
      const validationMiddleware = createValidationMiddleware(mockSchema);
      const mockReq = global.createMockRequest({ body: { valid: 'data' } });
      const mockRes = global.createMockResponse();
      const mockNext = global.createMockNext();

      validationMiddleware(mockReq, mockRes, mockNext);

      expect(mockNext).toHaveBeenCalled();
      expect(mockRes.status).not.toHaveBeenCalled();
    });

    test('should reject invalid requests', () => {
      const mockSchema = {
        validate: jest.fn().mockReturnValue({
          error: {
            details: [{ message: 'Validation failed' }]
          }
        })
      };
      
      const validationMiddleware = createValidationMiddleware(mockSchema);
      const mockReq = global.createMockRequest({ body: { invalid: 'data' } });
      const mockRes = global.createMockResponse();
      const mockNext = global.createMockNext();

      validationMiddleware(mockReq, mockRes, mockNext);

      expect(mockRes.status).toHaveBeenCalledWith(400);
      expect(mockRes.json).toHaveBeenCalledWith({
        success: false,
        error: {
          message: 'Validation failed',
          code: 'VALIDATION_ERROR'
        }
      });
      expect(mockNext).not.toHaveBeenCalled();
    });
  });

  describe('Rate limiting middleware', () => {
    test('should allow requests within limits', () => {
      const rateLimitMiddleware = createRateLimitMiddleware({
        windowMs: 60000,
        maxRequests: 10
      });

      const mockReq = global.createMockRequest({ ip: '127.0.0.1' });
      const mockRes = global.createMockResponse();
      const mockNext = global.createMockNext();

      rateLimitMiddleware(mockReq, mockRes, mockNext);

      expect(mockNext).toHaveBeenCalled();
      expect(mockRes.status).not.toHaveBeenCalled();
    });

    test('should reject requests exceeding limits', () => {
      const rateLimitMiddleware = createRateLimitMiddleware({
        windowMs: 1000,
        maxRequests: 2
      });

      const mockReq = global.createMockRequest({ ip: '127.0.0.1' });
      const mockRes = global.createMockResponse();
      const mockNext = global.createMockNext();

      // First two requests should pass
      rateLimitMiddleware(mockReq, mockRes, mockNext);
      expect(mockNext).toHaveBeenCalledTimes(1);

      rateLimitMiddleware(mockReq, mockRes, mockNext);
      expect(mockNext).toHaveBeenCalledTimes(2);

      // Third request should be rate limited
      rateLimitMiddleware(mockReq, mockRes, mockNext);
      expect(mockRes.status).toHaveBeenCalledWith(429);
      expect(mockRes.json).toHaveBeenCalledWith({
        success: false,
        error: {
          message: 'Too many requests',
          code: 'RATE_LIMIT_ERROR'
        }
      });
    });

    test('should track requests per IP', () => {
      const rateLimitMiddleware = createRateLimitMiddleware({
        windowMs: 60000,
        maxRequests: 1
      });

      // Request from IP 1
      const mockReq1 = global.createMockRequest({ ip: '127.0.0.1' });
      const mockRes1 = global.createMockResponse();
      const mockNext1 = global.createMockNext();

      // Request from IP 2
      const mockReq2 = global.createMockRequest({ ip: '127.0.0.2' });
      const mockRes2 = global.createMockResponse();
      const mockNext2 = global.createMockNext();

      // Both should pass as they're from different IPs
      rateLimitMiddleware(mockReq1, mockRes1, mockNext1);
      rateLimitMiddleware(mockReq2, mockRes2, mockNext2);

      expect(mockNext1).toHaveBeenCalled();
      expect(mockNext2).toHaveBeenCalled();
    });
  });

  describe('Middleware composition', () => {
    test('should chain multiple middleware functions', () => {
      const middleware1 = (req, res, next) => {
        req.middleware1Called = true;
        next();
      };

      const middleware2 = (req, res, next) => {
        req.middleware2Called = true;
        next();
      };

      const mockReq = global.createMockRequest();
      const mockRes = global.createMockResponse();
      const mockNext = global.createMockNext();

      middleware1(mockReq, mockRes, () => {
        middleware2(mockReq, mockRes, mockNext);
      });

      expect(mockReq.middleware1Called).toBe(true);
      expect(mockReq.middleware2Called).toBe(true);
      expect(mockNext).toHaveBeenCalled();
    });

    test('should stop chain on middleware error', () => {
      const errorMiddleware = (req, res, next) => {
        const error = new Error('Middleware error');
        error.statusCode = 403;
        next(error);
      };

      const secondMiddleware = (req, res, next) => {
        req.shouldNotBeCalled = true;
        next();
      };

      const mockReq = global.createMockRequest();
      const mockRes = global.createMockResponse();
      const mockNext = jest.fn((error) => {
        expect(error).toBeInstanceOf(Error);
        expect(error.message).toBe('Middleware error');
      });

      errorMiddleware(mockReq, mockRes, (error) => {
        if (error) {
          return mockNext(error);
        }
        secondMiddleware(mockReq, mockRes, mockNext);
      });

      expect(mockReq.shouldNotBeCalled).toBeUndefined();
      expect(mockNext).toHaveBeenCalledWith(expect.any(Error));
    });
  });

  describe('Request/Response utilities', () => {
    test('should create valid mock request', () => {
      const mockReq = global.createMockRequest({
        method: 'POST',
        url: '/api/test',
        body: { test: 'data' }
      });

      expect(mockReq.method).toBe('POST');
      expect(mockReq.url).toBe('/api/test');
      expect(mockReq.body).toEqual({ test: 'data' });
      expect(mockReq.ip).toBeDefined();
    });

    test('should create valid mock response', () => {
      const mockRes = global.createMockResponse();

      expect(mockRes.status).toBeDefined();
      expect(mockRes.json).toBeDefined();
      expect(mockRes.send).toBeDefined();
      expect(typeof mockRes.status).toBe('function');
      expect(typeof mockRes.json).toBe('function');
    });

    test('should create chainable mock response', () => {
      const mockRes = global.createMockResponse();

      const result = mockRes.status(200).json({ test: 'data' });
      
      expect(result).toBe(mockRes); // Should return self for chaining
      expect(mockRes.status).toHaveBeenCalledWith(200);
      expect(mockRes.json).toHaveBeenCalledWith({ test: 'data' });
    });
  });
});