import { jest } from '@jest/globals';

// Mock the logs module
jest.unstable_mockModule('../dist/utils/logs.js', () => ({
  warn: jest.fn(),
  error: jest.fn()
}));

// Import modules after mocking
const { getRequestURL, getRealIP } = await import('../dist/utils/network.js');
const logs = await import('../dist/utils/logs.js');

describe('Network utilities', () => {
  
  describe('getRequestURL', () => {
    test('should handle http URLs', () => {
      const request = { url: 'http://example.com/path' };
      const result = getRequestURL(request);
      
      expect(result).toBeInstanceOf(URL);
      expect(result.href).toBe('http://example.com/path');
    });

    test('should handle https URLs', () => {
      const request = { url: 'https://example.com/path' };
      const result = getRequestURL(request);
      
      expect(result).toBeInstanceOf(URL);
      expect(result.href).toBe('https://example.com/path');
    });

    test('should construct URL from path and host header', () => {
      const request = {
        url: '/path',
        headers: { host: 'example.com' }
      };
      const result = getRequestURL(request);
      
      expect(result).toBeInstanceOf(URL);
      expect(result.href).toBe('http://example.com/path');
    });

    test('should use https when secure property is true', () => {
      const request = {
        url: '/path',
        secure: true,
        headers: { host: 'example.com' }
      };
      const result = getRequestURL(request);
      
      expect(result.href).toBe('https://example.com/path');
    });

    test('should use https when x-forwarded-proto is https', () => {
      const request = {
        url: '/path',
        headers: { 
          host: 'example.com',
          'x-forwarded-proto': 'https'
        }
      };
      const result = getRequestURL(request);
      
      expect(result.href).toBe('https://example.com/path');
    });

    test('should handle Fetch-style headers with get() method', () => {
      const request = {
        url: '/path',
        headers: {
          get: jest.fn((name) => {
            if (name === 'host') return 'example.com';
            return null;
          })
        }
      };
      const result = getRequestURL(request);
      
      expect(result.href).toBe('http://example.com/path');
    });

    test('should return null for missing URL', () => {
      const request = {};
      const result = getRequestURL(request);
      
      expect(result).toBeNull();
    });

    test('should return null for invalid URL', () => {
      const request = {
        url: '/test',
        headers: { host: 'localhost' }
      };
      
      // Mock URL constructor to throw
      const originalURL = global.URL;
      global.URL = function() {
        throw new TypeError('Invalid URL');
      };
      
      const result = getRequestURL(request);
      expect(result).toBeNull();
      expect(logs.warn).toHaveBeenCalled();
      
      // Restore
      global.URL = originalURL;
    });

    test('should handle non-Error objects in catch block', () => {
      const request = {
        url: '/test',
        headers: { host: 'localhost' }
      };
      
      // Mock URL constructor to throw non-Error
      const originalURL = global.URL;
      global.URL = function() {
        throw "String error instead of Error object";
      };
      
      const result = getRequestURL(request);
      expect(result).toBeNull();
      
      // Restore
      global.URL = originalURL;
    });

    test('should handle array host headers in Express requests', () => {
      const request = {
        url: '/path',
        headers: { host: ['example.com', 'backup.com'] } // Array host
      };
      
      const result = getRequestURL(request);
      expect(result.href).toBe('http://example.com/path');
    });

    test('should handle empty array host headers', () => {
      const request = {
        url: '/path',
        headers: { host: [] } // Empty array
      };
      
      const result = getRequestURL(request);
      expect(result.href).toBe('http://localhost/path'); // Falls back to localhost
    });

    test('should handle x-forwarded-host with Fetch-style headers', () => {
      const request = {
        url: '/path',
        headers: {
          get: jest.fn((name) => {
            if (name === 'host') return null;
            if (name === 'x-forwarded-host') return 'forwarded.example.com';
            return null;
          })
        }
      };
      
      const result = getRequestURL(request);
      expect(result.href).toBe('http://forwarded.example.com/path');
    });

    test('should fallback to localhost for Fetch-style headers when all host headers are missing', () => {
      const request = {
        url: '/path',
        headers: {
          get: jest.fn(() => null) // All headers return null
        }
      };
      
      const result = getRequestURL(request);
      expect(result.href).toBe('http://localhost/path');
    });

    test('should handle x-forwarded-host in Express headers', () => {
      const request = {
        url: '/path',
        headers: { 
          'x-forwarded-host': 'forwarded.example.com'
          // No host header
        }
      };
      
      const result = getRequestURL(request);
      expect(result.href).toBe('http://forwarded.example.com/path');
    });

    test('should handle array x-forwarded-host headers', () => {
      const request = {
        url: '/path',
        headers: { 
          'x-forwarded-host': ['forwarded.example.com', 'backup.example.com']
        }
      };
      
      const result = getRequestURL(request);
      expect(result.href).toBe('http://forwarded.example.com/path');
    });

    test('should handle empty array x-forwarded-host headers', () => {
      const request = {
        url: '/path',
        headers: { 
          'x-forwarded-host': []
        }
      };
      
      const result = getRequestURL(request);
      expect(result.href).toBe('http://localhost/path');
    });
  });

  describe('getRealIP', () => {
    test('should extract IP from x-forwarded-for header', () => {
      const request = {
        headers: { 'x-forwarded-for': '192.168.1.100' }
      };
      
      const result = getRealIP(request);
      expect(result).toBe('192.168.1.100');
    });

    test('should extract first IP from comma-separated x-forwarded-for', () => {
      const request = {
        headers: { 'x-forwarded-for': '192.168.1.100, 10.0.0.1, 127.0.0.1' }
      };
      
      const result = getRealIP(request);
      expect(result).toBe('192.168.1.100');
    });

    test('should use x-real-ip when x-forwarded-for is missing', () => {
      const request = {
        headers: { 'x-real-ip': '192.168.1.100' }
      };
      
      const result = getRealIP(request);
      expect(result).toBe('192.168.1.100');
    });

    test('should handle Fetch-style headers using get() method', () => {
      const request = {
        headers: {
          get: jest.fn((name) => {
            if (name === 'x-forwarded-for') return '192.168.1.100';
            return null;
          })
        }
      };
      
      const result = getRealIP(request);
      expect(result).toBe('192.168.1.100');
    });

    test('should use server remoteAddress when headers are empty', () => {
      const request = { headers: {} };
      const server = { remoteAddress: '192.168.1.100' };
      
      const result = getRealIP(request, server);
      expect(result).toBe('192.168.1.100');
    });

    test('should use connection.remoteAddress for Express requests', () => {
      const request = {
        headers: {},
        connection: { remoteAddress: '192.168.1.100' }
      };
      
      const result = getRealIP(request);
      expect(result).toBe('192.168.1.100');
    });

    test('should use req.ip property when available', () => {
      const request = {
        headers: {},
        ip: '192.168.1.100'
      };
      
      const result = getRealIP(request);
      expect(result).toBe('192.168.1.100');
    });

    test('should clean IPv6 mapped IPv4 addresses', () => {
      const request = {
        headers: { 'x-forwarded-for': '::ffff:192.168.1.100' }
      };
      
      const result = getRealIP(request);
      expect(result).toBe('192.168.1.100');
    });

    test('should return 127.0.0.1 as ultimate fallback', () => {
      const request = { headers: {} };
      
      const result = getRealIP(request);
      expect(result).toBe('127.0.0.1');
    });

    test('should prioritize x-forwarded-for over other sources', () => {
      const request = {
        headers: { 'x-forwarded-for': '192.168.1.100' },
        connection: { remoteAddress: '10.0.0.1' },
        ip: '172.16.0.1'
      };
      
      const result = getRealIP(request);
      expect(result).toBe('192.168.1.100');
    });

    test('should handle array x-forwarded-for headers', () => {
      const request = {
        headers: { 'x-forwarded-for': ['192.168.1.100', '10.0.0.1'] }
      };
      
      const result = getRealIP(request);
      expect(result).toBe('192.168.1.100');
    });

    test('should handle array x-real-ip headers', () => {
      const request = {
        headers: { 'x-real-ip': ['192.168.1.100', '10.0.0.1'] }
      };
      
      const result = getRealIP(request);
      expect(result).toBe('192.168.1.100');
    });

    test('should use x-real-ip with Fetch-style headers when x-forwarded-for is missing', () => {
      const request = {
        headers: {
          get: jest.fn((name) => {
            if (name === 'x-forwarded-for') return null;
            if (name === 'x-real-ip') return '192.168.1.100';
            return null;
          })
        }
      };
      
      const result = getRealIP(request);
      expect(result).toBe('192.168.1.100');
    });

    test('should use socket.remoteAddress when connection.remoteAddress is missing', () => {
      const request = {
        headers: {},
        connection: {}, // connection exists but no remoteAddress
        socket: { remoteAddress: '192.168.1.100' }
      };
      
      const result = getRealIP(request);
      expect(result).toBe('192.168.1.100');
    });

    test('should handle missing connection but present socket', () => {
      const request = {
        headers: {},
        socket: { remoteAddress: '192.168.1.100' }
      };
      
      const result = getRealIP(request);
      // Note: socket.remoteAddress is only checked within the connection block
      // When no connection exists, it falls back to URL hostname/127.0.0.1
      expect(result).toBe('127.0.0.1');
    });

    test('should handle whitespace in comma-separated IPs', () => {
      const request = {
        headers: { 'x-forwarded-for': ' 192.168.1.100 , 10.0.0.1 , 127.0.0.1 ' }
      };
      
      const result = getRealIP(request);
      expect(result).toBe('192.168.1.100');
    });

    test('should fallback to URL hostname when all IP sources fail', () => {
      const request = {
        headers: {},
        url: '/test'
      };
      
      const result = getRealIP(request);
      // getRequestURL constructs URL with localhost as default host, so hostname is 'localhost'
      expect(result).toBe('localhost');
    });

    test('should handle undefined IP values gracefully', () => {
      const request = {
        headers: { 'x-forwarded-for': undefined, 'x-real-ip': undefined }
      };
      
      const result = getRealIP(request);
      expect(result).toBe('127.0.0.1');
    });

    test('should handle null IP values gracefully', () => {
      const request = {
        headers: { 'x-forwarded-for': null, 'x-real-ip': null }
      };
      
      const result = getRealIP(request);
      expect(result).toBe('127.0.0.1');
    });

    test('should handle empty string IP values', () => {
      const request = {
        headers: { 'x-forwarded-for': '', 'x-real-ip': '' }
      };
      
      const result = getRealIP(request);
      expect(result).toBe('127.0.0.1');
    });

    test('should handle empty array header values', () => {
      const request = {
        headers: { 
          'x-forwarded-for': [],
          'x-real-ip': []
        }
      };
      
      const result = getRealIP(request);
      expect(result).toBe('127.0.0.1');
    });
  });
});