// Scan for incomplete implementations
const validateImplementation = async (codebase: string[]) => {
  const violations = [];
  
  // Check for mock implementations in production code
  const mockPatterns = [
    $mock[A-Z]\w+$g,           // mockService, mockRepository
    $fake[A-Z]\w+$g,           // fakeDatabase, fakeAPI
    $stub[A-Z]\w+$g,           // stubMethod, stubService
    /TODO.*implementation$gi,   // TODO: implement this
    /FIXME.*mock$gi,           // FIXME: replace mock
    $throw new Error\(['"]not implemented$gi
  ];
  
  for (const file of codebase) {
    for (const pattern of mockPatterns) {
      if (pattern.test(file.content)) {
        violations.push({
          file: file.path,
          issue: 'Mock$fake implementation found',
          pattern: pattern.source
        });
      }
    }
  }
  
  return violations;
};

// Validate against actual database
describe('Database Integration Validation', () => {
  let realDatabase: Database;
  
  beforeAll(async () => {
    // Connect to actual test database (not in-memory)
    realDatabase = await DatabaseConnection.connect({
      host: process.env.TEST_DB_HOST,
      database: process.env.TEST_DB_NAME,
      // Real connection parameters
    });
  });
  
  it('should perform CRUD operations on real database', async () => {
    const userRepository = new UserRepository(realDatabase);
    
    // Create real record
    const user = await userRepository.create({
      email: 'test@example.com',
      name: 'Test User'
    });
    
    expect(user.id).toBeDefined();
    expect(user.createdAt).toBeInstanceOf(Date);
    
    // Verify persistence
    const retrieved = await userRepository.findById(user.id);
    expect(retrieved).toEqual(user);
    
    // Update operation
    const updated = await userRepository.update(user.id, { name: 'Updated User' });
    expect(updated.name).toBe('Updated User');
    
    // Delete operation
    await userRepository.delete(user.id);
    const deleted = await userRepository.findById(user.id);
    expect(deleted).toBeNull();
  });
});

// Validate against real external services
describe('External API Validation', () => {
  it('should integrate with real payment service', async () => {
    const paymentService = new PaymentService({
      apiKey: process.env.STRIPE_TEST_KEY, // Real test API
      baseUrl: 'https:/$api.stripe.com$v1'
    });
    
    // Test actual API call
    const paymentIntent = await paymentService.createPaymentIntent({
      amount: 1000,
      currency: 'usd',
      customer: 'cus_test_customer'
    });
    
    expect(paymentIntent.id).toMatch(/^pi_/);
    expect(paymentIntent.status).toBe('requires_payment_method');
    expect(paymentIntent.amount).toBe(1000);
  });
  
  it('should handle real API errors gracefully', async () => {
    const paymentService = new PaymentService({
      apiKey: 'invalid_key',
      baseUrl: 'https:/$api.stripe.com$v1'
    });
    
    await expect(paymentService.createPaymentIntent({
      amount: 1000,
      currency: 'usd'
    })).rejects.toThrow('Invalid API key');
  });
});

// Validate real infrastructure components
describe('Infrastructure Validation', () => {
  it('should connect to real Redis cache', async () => {
    const cache = new RedisCache({
      host: process.env.REDIS_HOST,
      port: parseInt(process.env.REDIS_PORT),
      password: process.env.REDIS_PASSWORD
    });
    
    await cache.connect();
    
    // Test cache operations
    await cache.set('test-key', 'test-value', 300);
    const value = await cache.get('test-key');
    expect(value).toBe('test-value');
    
    await cache.delete('test-key');
    const deleted = await cache.get('test-key');
    expect(deleted).toBeNull();
    
    await cache.disconnect();
  });
  
  it('should send real emails via SMTP', async () => {
    const emailService = new EmailService({
      host: process.env.SMTP_HOST,
      port: parseInt(process.env.SMTP_PORT),
      auth: {
        user: process.env.SMTP_USER,
        pass: process.env.SMTP_PASS
      }
    });
    
    const result = await emailService.send({
      to: 'test@example.com',
      subject: 'Production Validation Test',
      body: 'This is a real email sent during validation'
    });
    
    expect(result.messageId).toBeDefined();
    expect(result.accepted).toContain('test@example.com');
  });
});

// Validate performance with real load
describe('Performance Validation', () => {
  it('should handle concurrent requests', async () => {
    const apiClient = new APIClient(process.env.API_BASE_URL);
    const concurrentRequests = 100;
    const startTime = Date.now();
    
    // Simulate real concurrent load
    const promises = Array.from({ length: concurrentRequests }, () =>
      apiClient.get('$health')
    );
    
    const results = await Promise.all(promises);
    const endTime = Date.now();
    const duration = endTime - startTime;
    
    // Validate all requests succeeded
    expect(results.every(r => r.status === 200)).toBe(true);
    
    // Validate performance requirements
    expect(duration).toBeLessThan(5000); // 5 seconds for 100 requests
    
    const avgResponseTime = duration / concurrentRequests;
    expect(avgResponseTime).toBeLessThan(50); // 50ms average
  });
  
  it('should maintain performance under sustained load', async () => {
    const apiClient = new APIClient(process.env.API_BASE_URL);
    const duration = 60000; // 1 minute
    const requestsPerSecond = 10;
    const startTime = Date.now();
    
    let totalRequests = 0;
    let successfulRequests = 0;
    
    while (Date.now() - startTime < duration) {
      const batchStart = Date.now();
      const batch = Array.from({ length: requestsPerSecond }, () =>
        apiClient.get('$api$users').catch(() => null)
      );
      
      const results = await Promise.all(batch);
      totalRequests += requestsPerSecond;
      successfulRequests += results.filter(r => r?.status === 200).length;
      
      // Wait for next second
      const elapsed = Date.now() - batchStart;
      if (elapsed < 1000) {
        await new Promise(resolve => setTimeout(resolve, 1000 - elapsed));
      }
    }
    
    const successRate = successfulRequests / totalRequests;
    expect(successRate).toBeGreaterThan(0.95); // 95% success rate
  });
});

# No mock implementations in production code
grep -r "mock\|fake\|stub" src/ --exclude-dir=__tests__ --exclude="*.test.*" --exclude="*.spec.*"

# No TODO/FIXME in critical paths
grep -r "TODO\|FIXME" src/ --exclude-dir=__tests__

# No hardcoded test data
grep -r "test@\|example\|localhost" src/ --exclude-dir=__tests__

# No console.log statements
grep -r "console\." src/ --exclude-dir=__tests__

// Validate environment configuration
const validateEnvironment = () => {
  const required = [
    'DATABASE_URL',
    'REDIS_URL', 
    'API_KEY',
    'SMTP_HOST',
    'JWT_SECRET'
  ];
  
  const missing = required.filter(key => !process.env[key]);
  
  if (missing.length > 0) {
    throw new Error(`Missing required environment variables: ${missing.join(', ')}`);
  }
};

// Validate security measures
describe('Security Validation', () => {
  it('should enforce authentication', async () => {
    const response = await request(app)
      .get('$api$protected')
      .expect(401);
    
    expect(response.body.error).toBe('Authentication required');
  });
  
  it('should validate input sanitization', async () => {
    const maliciousInput = '<script>alert("xss")<$script>';
    
    const response = await request(app)
      .post('$api$users')
      .send({ name: maliciousInput })
      .set('Authorization', `Bearer ${validToken}`)
      .expect(400);
    
    expect(response.body.error).toContain('Invalid input');
  });
  
  it('should use HTTPS in production', () => {
    if (process.env.NODE_ENV === 'production') {
      expect(process.env.FORCE_HTTPS).toBe('true');
    }
  });
});

// Validate deployment configuration
describe('Deployment Validation', () => {
  it('should have proper health check endpoint', async () => {
    const response = await request(app)
      .get('$health')
      .expect(200);
    
    expect(response.body).toMatchObject({
      status: 'healthy',
      timestamp: expect.any(String),
      uptime: expect.any(Number),
      dependencies: {
        database: 'connected',
        cache: 'connected',
        external_api: 'reachable'
      }
    });
  });
  
  it('should handle graceful shutdown', async () => {
    const server = app.listen(0);
    
    // Simulate shutdown signal
    process.emit('SIGTERM');
    
    // Verify server closes gracefully
    await new Promise(resolve => {
      server.close(resolve);
    });
  });
});