function PlaybackStateManager({ interval = 1000, onChange } = {}) {
  let lastTime = 0;
  let lastState = 'unknown';
  let timer = null;

  function getState() {
    const video = document.querySelector('video');
    if (video) {
      const advancing = video.currentTime > lastTime;
      lastTime = video.currentTime;

      if (video.ended) return 'ended';
      if (video.paused) return 'paused';
      if (advancing && video.readyState >= 3) return 'playing';
      return 'buffering';
    }

    const btn = document.querySelector('.tv-play-btn, .play-icon, .pause-icon');
    if (btn) {
      const cls = btn.className;
      if (/pause/.test(cls)) return 'playing';
      if (/play/.test(cls)) return 'paused';
    }

    const loadingText = document.body.textContent;
    if (loadingText.includes('全力加载中')) return 'loading';

    return 'unknown';
  }

  function start() {
    timer = setInterval(() => {
      const state = getState();
      if (state !== lastState) {
        lastState = state;
        if (typeof onChange === 'function') onChange(state);
      }
    }, interval);
  }

  function stop() {
    if (timer) clearInterval(timer);
    timer = null;
  }

  return {
    start,
    stop,
    getState: () => lastState,
  };
}

const manager = PlaybackStateManager({
  interval: 1500,
  onChange: (state) => {
    console.log('播放状态变化:', state);
    // 可在此触发自动点击、截图、日志记录等操作
  },
});

manager.start();

// 随时获取当前状态
console.log('当前状态:', manager.getState());

// 停止监控
// manager.stop();