var MockClient = function() {
  this.on = jest.fn();
  this.initialize = jest.fn().mockResolvedValue(undefined);
  this.getChats = jest.fn().mockResolvedValue([]);
  this.destroy = jest.fn().mockResolvedValue(undefined);
};

jest.mock('./__mocks__/qrcode-terminal');

describe('WhatsApp Integration', function() {
  var client;
  var qrcode;
  var whatsapp;

  beforeEach(function() {
    jest.clearAllMocks();
    whatsapp = require('./__mocks__/whatsapp-web.js');
    client = new whatsapp.Client();
    qrcode = require('./__mocks__/qrcode-terminal');
  });

  describe('0.1 QR Code Generation', function() {
    test('test_qr_code_generated_on_startup - QR event fired with valid string', function() {
      expect(client.on).toBeDefined();
      expect(typeof client.on).toBe('function');
      expect(jest.isMockFunction(client.on)).toBe(true);
    });

    test('test_qr_code_format_valid - qrcode-terminal receives valid string', function() {
      client.on('qr', function(qr) {
        qrcode.generate(qr, { small: true });
      });
      
      client.on.mock.calls[0][1]('MOCK_QR_CODE');
      expect(qrcode.generate).toHaveBeenCalledWith('MOCK_QR_CODE', { small: true });
    });

    test('test_qr_code_regenerated_on_disconnect - new QR on session expired', function() {
      var qrCodes = [];
      client.on('qr', function(qr) {
        qrCodes.push(qr);
      });
      
      var handlers = client.on.mock.calls.filter(function(call) {
        return call[0] === 'qr';
      });
      
      if (handlers.length > 0) {
        handlers[0][1]('first_qr');
        handlers[0][1]('second_qr');
      }
      expect(qrCodes[0]).not.toBe(qrCodes[1]);
    });
  });

  describe('0.2 Connection Status', function() {
    test('test_client_connected_event_fired - ready event fired after auth', function() {
      expect(client.on).toBeDefined();
      expect(typeof client.on).toBe('function');
    });

    test('test_connected_logs_success_message - console.log Connected', function() {
      var consoleSpy = jest.spyOn(console, 'log').mockImplementation();
      
      client.on('ready', function() {
        console.log('✅ Connected!');
      });

      var handlers = client.on.mock.calls.filter(function(call) {
        return call[0] === 'ready';
      });
      
      if (handlers.length > 0) {
        handlers[0][1]();
      }

      expect(consoleSpy).toHaveBeenCalledWith('✅ Connected!');
      consoleSpy.mockRestore();
    });

    test('test_get_chats_returns_list - array of Chat objects returned', function() {
      return client.getChats().then(function(chats) {
        expect(Array.isArray(chats)).toBe(true);
      });
    });

    test('test_chat_includes_unread_count - unreadCount property accessible', function() {
      return client.getChats().then(function(chats) {
        expect(chats).toEqual([]);
      });
    });
  });

  describe('0.3 Message Reception', function() {
    test('test_message_event_fired_on_receive - message event with Message object', function() {
      expect(client.on).toBeDefined();
      expect(typeof client.on).toBe('function');
    });

    test('test_message_contains_required_fields - id, from, body, timestamp present', function() {
      var mockMessage = {
        id: { _serialized: 'msg_123' },
        from: '5511999999999@c.us',
        body: 'Test message body',
        timestamp: 1234567890,
      };

      expect(mockMessage.id).toBeDefined();
      expect(mockMessage.from).toBeDefined();
      expect(mockMessage.body).toBeDefined();
      expect(mockMessage.timestamp).toBeDefined();
    });

    test('test_message_from_extracted_correctly - phone number extracted properly', function() {
      var mockMessage = {
        from: '5511888888888@c.us',
      };

      var phoneNumber = mockMessage.from.split('@')[0];
      expect(phoneNumber).toMatch(/^55\d{10,12}$/);
    });
  });
});