import { cn } from '../src/lib/utils';

/**
 * Type safety validation tests - these test will initially fail until we fix all type safety violations
 * Testing that no functions return 'any' type and all types are properly defined
 */
describe('Type Safety Validation', () => {
  describe('Utility Functions', () => {
    test('cn function should return string type', () => {
      const result = cn('class1', 'class2');
      expect(typeof result).toBe('string');
      expect(result).toContain('class1');
      expect(result).toContain('class2');
    });

    test('cn function should handle undefined values', () => {
      const result = cn('class1', undefined, 'class2');
      expect(typeof result).toBe('string');
      expect(result).toContain('class1');
      expect(result).toContain('class2');
    });
  });

  describe('Type Guards and Validation', () => {
    test('should validate external API response data', () => {
      const mockApiResponse = {
        id: 'test-id',
        data: { key: 'value' }
      };

      expect(mockApiResponse).toHaveProperty('id');
      expect(mockApiResponse).toHaveProperty('data');
      expect(typeof mockApiResponse.id).toBe('string');
    });

    test('should reject invalid external data', () => {
      const invalidData = { invalid: true, missing: 'required fields' };
      
      expect(() => {
        validateExternalData(invalidData);
      }).toThrow();
    });
  });

  describe('IPC Communication Type Safety', () => {
    test('should validate IPC request structure', () => {
      const validIPCRequest = {
        id: 'test-request-id',
        channel: 'test-channel', 
        data: { param: 'value' }
      };

      expect(validIPCRequest).toHaveProperty('id');
      expect(validIPCRequest).toHaveProperty('channel');
      expect(validIPCRequest).toHaveProperty('data');
      expect(typeof validIPCRequest.id).toBe('string');
      expect(typeof validIPCRequest.channel).toBe('string');
    });

    test('should validate IPC response structure', () => {
      const validIPCResponse = {
        id: 'test-response-id',
        success: true,
        data: { result: 'success' }
      };

      expect(validIPCResponse).toHaveProperty('id');
      expect(validIPCResponse).toHaveProperty('success');
      expect(typeof validIPCResponse.success).toBe('boolean');
    });
  });

  describe('TypeScript Compilation Tests', () => {
    test('should validate utility functions have proper types', () => {
      const result = cn('test');
      expect(typeof result).toBe('string');
      expect(result).toBe('test');
    });

    test('should handle type validation correctly', () => {
      const validData = { id: 'test-id', data: { key: 'value' } };
      expect(() => validateExternalData(validData)).not.toThrow();
    });
  });
});

/**
 * Helper function that will be implemented as part of type safety fixes
 */
function validateExternalData(data: unknown): void {
  if (!data || typeof data !== 'object') {
    throw new Error('Invalid external data: must be an object');
  }
  
  const dataObj = data as Record<string, unknown>;
  if (!dataObj.id || typeof dataObj.id !== 'string') {
    throw new Error('Invalid external data: missing required id field');
  }
}