'use strict';
(function (root) {
  class LivePlayer {
    static key(cameras, quality) {
      // Polling readiness, labels and recording status must not recreate video.
      return JSON.stringify(cameras.map(c => [c.id, !!c.enabled])) + quality;
    }
    constructor(video, panel, source, options = {}) {
      this.video = video; this.panel = panel; this.source = source;
      this.Hls = options.Hls || root.Hls;
      this.clock = options.clock || root;
      this.now = options.now || (() => Date.now());
      this.hls = null; this.timer = null; this.stopped = false;
      this.attempt = 0; this.played = false; this.userPaused = false;
      this.connecting = true; this.failed = false;
      this.lastTime = 0; this.lastProgress = this.now(); this.stableSince = 0;
      this.handlers = {
        playing: () => {
          if (this.timer !== null) this.clock.clearTimeout(this.timer);
          this.timer = null;
          this.played = true; this.connecting = false; this.failed = false;
          this.userPaused = false; this.lastProgress = this.now();
          this.lastTime = video.currentTime; this.stableSince = this.now();
          panel.querySelector('.video-empty').hidden = true;
          panel.querySelector('.video-error').hidden = true;
        },
        pause: () => { if (!this.connecting && this.played && !video.ended && !video.error && video.readyState >= 2) this.userPaused = true; },
        play: () => { this.userPaused = false; this.lastProgress = this.now(); if (this.failed) this.retryIfNeeded(); },
        error: () => this.retry('画面暂时中断'),
        ended: () => this.retry('视频连接已结束')
      };
      for (const [event, handler] of Object.entries(this.handlers)) video.addEventListener(event, handler);
      this.watchdog = this.clock.setInterval(() => this.watch(), 5000);
      this.start();
    }
    message(text) {
      const el = this.panel.querySelector('.video-error'); el.textContent = text; el.hidden = false;
    }
    start() {
      if (this.stopped) return;
      this.connecting = true; this.failed = false;
      this.release();
      this.lastProgress = this.now(); this.lastTime = 0;
      const Hls = this.Hls;
      if (Hls?.isSupported()) {
        const hls = new Hls({
          maxBufferLength: 20, backBufferLength: 5,
          liveSyncDurationCount: 3, liveMaxLatencyDurationCount: 8,
          maxLiveSyncPlaybackRate: 1.2,
          manifestLoadingTimeOut: 60000, levelLoadingTimeOut: 15000,
          fragLoadingTimeOut: 15000, manifestLoadingMaxRetry: 2, levelLoadingMaxRetry: 2
        });
        this.hls = hls;
        hls.on(Hls.Events.ERROR, (_, data) => {
          if (this.hls === hls && data.fatal) this.retry('画面暂时中断');
        });
        hls.on(Hls.Events.MANIFEST_PARSED, () => {
          if (this.hls === hls && !this.stopped) this.video.play().catch(() => {});
        });
        hls.loadSource(this.source); hls.attachMedia(this.video);
      } else if (this.video.canPlayType('application/vnd.apple.mpegurl')) {
        this.video.src = this.source; this.video.play().catch(() => {});
      } else {
        this.userPaused = true;
        this.message('当前浏览器不支持视频播放，请使用较新的浏览器。');
      }
    }
    retry(reason) {
      if (this.stopped || this.timer !== null) return;
      this.failed = true;
      if (this.userPaused) return;
      const delay = Math.min(30000, 2000 * 2 ** Math.min(this.attempt++, 4));
      this.message(reason + '，正在自动重新连接…');
      this.timer = this.clock.setTimeout(() => {
        this.timer = null;
        if (!this.stopped) this.start();
      }, delay);
    }
    watch() {
      if (this.stopped || this.timer !== null || this.userPaused) return;
      const current = this.video.currentTime;
      if (this.video.readyState >= 2 && this.video.videoWidth > 0 && current > this.lastTime + 0.1) {
        this.lastTime = current; this.lastProgress = this.now();
        if (this.stableSince && this.now() - this.stableSince > 30000) this.attempt = 0;
        return;
      }
      const grace = this.connecting ? 65000 : 25000;
      if (this.now() - this.lastProgress > grace) this.retry('画面停顿');
    }
    retryIfNeeded() {
      if (!this.failed || this.stopped) return;
      if (this.timer !== null) this.clock.clearTimeout(this.timer);
      this.timer = null; this.start();
    }
    release() {
      const old = this.hls; this.hls = null;
      if (old) old.destroy();
      this.video.pause(); this.video.removeAttribute('src'); this.video.load();
    }
    destroy() {
      this.stopped = true; this.connecting = true;
      if (this.timer !== null) this.clock.clearTimeout(this.timer);
      this.timer = null; this.clock.clearInterval(this.watchdog);
      for (const [event, handler] of Object.entries(this.handlers)) this.video.removeEventListener(event, handler);
      this.release();
    }
  }
  if (typeof module !== 'undefined' && module.exports) module.exports = LivePlayer;
  else root.ZhaoLivePlayer = LivePlayer;
})(typeof window !== 'undefined' ? window : globalThis);