var net = require('net');

var count = 0,
  users = {};

var server = net.createServer(function (conn) {
  console.log('連接到');
  conn.write(
     "\r\n > welcome to node-chat!"
    + "\r\n > " + count + " other people are connected at this time."
    + "\r\n > please write your name and press enter: "
   );
  count++;
  // 代表當(dāng)前連接的昵稱
  var nickname;
  console.log(conn);
  conn.on('data', function (data) {
    // 刪除\r\n
    // data = data.replace('\r\n', '  ');

    // 當(dāng)前注冊的昵稱不存在
    if (!nickname) {
      // 用戶名存在
      if(users[data]) {
        conn.write('nickname in use');
        return;
      } else {
        // 用戶名給nickname
        nickname = data;
        users[nickname] = conn;
        for (var i in users) {
          users[i].write('\r\n > ' + nickname + ' join our room \r\n > I: ');
        }
      }
    } else {
      // 開始聊天
      for (var i in users) {
        if (i != nickname) {
          users[i].write('\r\n > ' + nickname + ': ' + data);

        }
      }
    } 
  });

  conn.on('close', function () {
    count--;
  });
  conn.setEncoding('utf8');


});

server.listen(3000, function () {
  console.log('服務(wù)器監(jiān)聽端口3000');
})