let socket = null;
let heartbeatInterval = null;
let reconnectCount = 0;
let reconnectTimer = null;

// 重连配置
const RECONNECT_CONFIG = {
  MAX_COUNT: 10, // 最大重连次数
  INITIAL_DELAY: 2000, // 初始重连延迟（2秒）
  MAX_DELAY: 60000, // 最大重连延迟（1分钟）
};

/**
 * 建立 WebSocket 连接
 */
function createWebSocket(token, onUpdate, onMessage) {
  const url = `wss://api.shelingxingqiu.com/socket?authorization=${token}`;
  socket = uni.connectSocket({
    url,
    success: () => {
      console.log("websocket 连接成功");
      onUpdate(true);
      reconnectCount = 0; // 重置重连次数
    },
  });

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

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

  uni.onSocketClose((result) => {
    console.log("WebSocket 已关闭", result);
    onUpdate(false);
    stopHeartbeat();
    reconnect(onUpdate, onMessage);
  });

  // 启动心跳
  startHeartbeat();
}

/**
 * 重连机制
 */
function reconnect(onUpdate, onMessage) {
  if (reconnectCount >= RECONNECT_CONFIG.MAX_COUNT) return;

  reconnectTimer && clearTimeout(reconnectTimer);

  const token = uni.getStorageSync("token");
  if (!token) return;
  // 计算重连延迟（指数退避）
  const delay = Math.min(
    RECONNECT_CONFIG.INITIAL_DELAY * Math.pow(2, reconnectCount),
    RECONNECT_CONFIG.MAX_DELAY
  );
  reconnectTimer = setTimeout(() => {
    console.log("reconnecting...");
    createWebSocket(token, onUpdate, onMessage);
    reconnectCount++;
  }, delay);
}

function closeWebSocket() {
  if (socket) {
    // 清理重连定时器
    reconnectCount = 0;
    reconnectTimer && clearTimeout(reconnectTimer);
    stopHeartbeat();
    socket.close();
  }
}

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

  heartbeatInterval = setInterval(() => {
    if (socket && uni.sendSocketMessage) {
      uni.sendSocketMessage({
        data: {
          event: "ping",
          data: {},
        },
        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,
};