var Chat = function (socket) {
  this.socket = socket;
};

// 发送聊天消息
Chat.prototype.sendMessage = function (room, text) {
  var message = {
    room: room,
    text: text,
  };
  this.socket.emit('message', message);
};

// 变更房间的函数
Chat.prototype.changeRoom = function (room) {
  this.socket.emit('join', {
    newRoom: room,
  })
};

// 处理聊天命令
Chat.prototype.processCommand = function (command) {
  var words = command.split(' ');
  // 从第一个单词开始解析命令
  var command = words[0].substring(1, words[0].length).toLowerCase();
  var message = false;

  switch (command) {
    case 'join':
      words.shift();
      var room = words.join(" ");
      this.changeRoom(room); // 处理房间的变换和创建
      break;
    case 'nick':
      words.shift();
      var name = words.join(' ');
      this.socket.emit('nameAttempt', name); // 处理更名尝试
      break;
    default: // 如果命令无法识别,返回错误信息
      message = 'Unrecognized command.';
  }
  return message;
}