class Tracker {
  constructor(options = {}) {
    this.baseUrl = options.baseUrl || '';
    this.timer = null;
    this.startTime = 0;
    this.heartbeatInterval = options.heartbeatInterval || 30000; // 默认30秒发送一次心跳
    this.visitCookieTimeout = options.visitCookieTimeout || 1; // 默认访问次数cookie有效期1分钟
    this.maxVisitCount = options.maxVisitCount || 5; // 默认最大访问次数5次
    this.blockCookieTimeout = options.blockCookieTimeout || 180; // 默认封锁cookie有效期180分钟
    this.myEventSend = options.myEventSend || (() => {}); // 是否开启自定义事件上报
    this.beforeDestroy = options.beforeDestroy || (() => {}); // 销毁前的回调函数
  }

init() {
  const visitCookieName = 'userVisitCount';
  const blockCookieName = 'userBlocked';
  const isBlocked = getCookie(blockCookieName);
  const doneFN = () => {
    this.startTime = Date.now();
    this.bindEvents();
    this.startHeartbeat();
  }
  if (isBlocked) {
    // restoreBlock();
    return;
  }

  let visitCount = getCookie(visitCookieName);
  if (visitCount) {
    visitCount = parseInt(visitCount, 10);
    if (visitCount >= this.maxVisitCount) {
      setCookie(blockCookieName, 'true', this.blockCookieTimeout); // 封锁用户 180 分钟
      deleteCookie(visitCookieName);
      // restoreBlock();
    } else {
      visitCount += 1;
      setCookie(visitCookieName, visitCount, this.visitCookieTimeout); // 每次访问 +1，有效期 1 分钟
      doneFN();
    }
  } else {
    setCookie(visitCookieName, '1', this.visitCookieTimeout); // 首次访问，设置访问次数为 1
    doneFN();
  }
}

  bindEvents() {
    window.addEventListener('beforeunload', this.handleBeforeUnload);
    window.addEventListener('click', this.handleClickEvent);
    this.myEventSend(this.sendData.bind(this)); // 绑定自定义事件上报
  }

  startHeartbeat() {
    this.timer = setInterval(() => {
      this.sendData({
        eventType: 'heartbeat',
        duration: Math.round((Date.now() - this.startTime) / 1000),
      }, {heartbeatSeconds: this.heartbeatInterval});
    }, this.heartbeatInterval);
  }

  handleBeforeUnload =  (e) => {
    const data = {
      eventType: 'page_close',
      duration: Math.round((Date.now() - this.startTime) / 1000),
    };
    const payload = JSON.stringify(data);
    if (navigator.sendBeacon) {
      navigator.sendBeacon(this.baseUrl, payload);
    } else {
      this.sendData(payload, {heartbeatSeconds: this.heartbeatInterval});
    }
  };

  handleClickEvent = (event) => {
    const target = event.target;
    if (target.matches('[data-track]')) {
      const trackInfo = {
        eventType: 'button_click',
        elementId: target.id || '无ID',
        elementClass: target.className || '无class',
        text: target.innerText || target.textContent || '',
        timestamp: new Date().toISOString(),
      };
      this.sendData(trackInfo, {heartbeatSeconds: this.heartbeatInterval});
    }
  };

  sendData(data, headers = {}) {
    console.log('上报埋点数据:', data);
    fetch(`${this.baseUrl}`, { method: 'POST', headers: { 'Content-Type': 'application/json' ,...headers}, body: JSON.stringify(data) });
  }

  destroy() {
    window.removeEventListener('beforeunload', this.handleBeforeUnload);
    window.removeEventListener('click', this.handleClickEvent);
    this.beforeDestroy();
    if (this.timer) {
      clearInterval(this.timer);
    }
    this.sendData({
      eventType: 'tracker_destroyed',
      duration: Math.round((Date.now() - this.startTime) / 1000),
    }, {heartbeatSeconds: this.heartbeatInterval});
  }
}

// 使用示例：
// const tracker = new Tracker({ baseUrl: 'https://your-tracking-api.com' });
// tracker.init();

// 暴露给全局或者作为模块导出
window.Tracker = Tracker;