let socket = null;
let heartbeatInterval = null;

/**
 * 建立 WebSocket 连接
 */
function createWebSocket(token, onMessage) {
  socket = uni.connectSocket({
    url: `ws://120.79.241.5:8000/socket?authorization=${token}`,
    success: () => console.log("websocket 连接成功"),
  });

  // 接收消息
  uni.onSocketMessage((res) => {
    if (onMessage) onMessage(res.data);
  });

  // 错误处理
  uni.onSocketError((err) => {
    console.error("WebSocket 错误", err);
  });

  // 关闭处理
  uni.onSocketClose(() => {
    console.log("WebSocket 已关闭");
  });

  // 启动心跳
  startHeartbeat();
}

function closeWebSocket() {
  if (socket) socket.close();
}

/**
 * 启动心跳
 */
function startHeartbeat() {
  stopHeartbeat(); // 防止重复启动

  heartbeatInterval = setInterval(() => {
    if (socket && uni.sendSocketMessage) {
      console.log("ping");
      uni.sendSocketMessage({
        data: "ping",
        fail: (err) => {
          console.error("发送心跳失败", err);
        },
      });
    }
  }, 5000);
}

/**
 * 停止心跳
 */
function stopHeartbeat() {
  if (heartbeatInterval) {
    clearInterval(heartbeatInterval);
    heartbeatInterval = null;
  }
}

export default {
  createWebSocket,
  closeWebSocket,
};