// ==UserScript==
// @name         全网页强制倍速
// @namespace    https://workbuddy.cn
// @version      1.0
// @description  在所有网页强制锁定视频倍速（电脑/手机通用）：原生接口劫持+高频守护+动态视频+iframe 支持
// @match        *://*/*
// @grant        none
// @run-at       document-idle
// @author       WorkBuddy
// ==/UserScript==

(function(){
  function initForceSpeed(){
    if (window.__forceSpeedReady) return;
    window.__forceSpeedReady = true;

    var currentRate = 1;
    var forceAutoRate = false;

    var NATIVE_RATE_GET = null, NATIVE_RATE_SET = null;
    try {
      var nd = Object.getOwnPropertyDescriptor(HTMLMediaElement.prototype, 'playbackRate');
      if (nd && nd.get && nd.set) { NATIVE_RATE_GET = nd.get; NATIVE_RATE_SET = nd.set; }
    } catch (e) {}

    function getAllVideos(){
      var vids = [];
      (function collect(doc, depth){
        if (depth > 6) return;
        try {
          var vs = doc.querySelectorAll('video');
          for (var i = 0; i < vs.length; i++) vids.push(vs[i]);
          var fs = doc.querySelectorAll('iframe');
          for (var j = 0; j < fs.length; j++) {
            try { if (fs[j].contentDocument) collect(fs[j].contentDocument, depth + 1); } catch (e) {}
          }
        } catch (e) {}
      })(document, 0);
      return vids;
    }

    function forceVideoRate(v, rate){
      try {
        if (NATIVE_RATE_SET) { try { NATIVE_RATE_SET.call(v, rate); } catch (e) {} }
        else { v.playbackRate = rate; }
        try { if (v.defaultPlaybackRate !== rate) v.defaultPlaybackRate = rate; } catch (e) {}
        if (v.__lockRate !== rate) {
          v.__lockRate = rate;
          try {
            Object.defineProperty(v, 'playbackRate', {
              configurable: true, enumerable: true,
              get: function(){ try { return NATIVE_RATE_GET ? NATIVE_RATE_GET.call(v) : rate; } catch (e) { return rate; } },
              set: function(){}
            });
          } catch (e) {}
        }
        if (Math.abs(v.playbackRate - rate) > 0.01 && NATIVE_RATE_SET) {
          try { NATIVE_RATE_SET.call(v, rate); } catch (e) {}
        }
      } catch (e) {}
    }

    function applyRateLocal(rate){
      try { var vs = document.querySelectorAll('video'); for (var i = 0; i < vs.length; i++) forceVideoRate(vs[i], rate); } catch (e) {}
    }

    function broadcastRate(rate){
      (function send(win){
        try { win.postMessage({ __forceSpeedRate: rate }, '*'); } catch (e) {}
        var frames, len = 0;
        try { frames = win.frames; len = frames.length; } catch (e) { return; }
        for (var i = 0; i < len; i++) { try { send(frames[i]); } catch (e) {} }
      })(window);
    }

    function unlockVideos(){
      var vs = getAllVideos();
      for (var i = 0; i < vs.length; i++) {
        try { delete vs[i].playbackRate; } catch (e) {}
        try { delete vs[i].__lockRate; } catch (e) {}
      }
    }

    function setRate(rate){
      currentRate = rate;
      applyRateLocal(rate);
      var vs = getAllVideos();
      for (var i = 0; i < vs.length; i++) forceVideoRate(vs[i], rate);
      broadcastRate(rate);
    }

    var frameRate = 0;
    try {
      window.addEventListener('message', function(e){
        if (e.source === window) return;
        var d = e.data;
        if (!d || typeof d !== 'object' || typeof d.__forceSpeedRate !== 'number') return;
        if (d.__forceSpeedRate < 0) { frameRate = 0; unlockVideos(); applyRateLocal(0); return; }
        frameRate = d.__forceSpeedRate;
        applyRateLocal(d.__forceSpeedRate);
      });
    } catch (e) {}

    try {
      document.addEventListener('ratechange', function(e){
        var v = e.target;
        if (!v || v.tagName !== 'VIDEO') return;
        var target = forceAutoRate ? currentRate : frameRate;
        if (!target) return;
        if (Math.abs(v.playbackRate - target) > 0.01) {
          setTimeout(function(){ forceVideoRate(v, target); }, 50);
        }
      }, true);
    } catch (e) {}

    var rateTimer = null;
    function startRateKeeper(){
      if (rateTimer) return;
      rateTimer = setInterval(function(){
        if (!forceAutoRate) return;
        applyRateLocal(currentRate);
        var vs = getAllVideos();
        for (var i = 0; i < vs.length; i++) forceVideoRate(vs[i], currentRate);
        broadcastRate(currentRate);
      }, 500);
    }
    function stopRateKeeper(){
      if (rateTimer) { clearInterval(rateTimer); rateTimer = null; }
    }

    try {
      var mo = new MutationObserver(function(){
        if (!forceAutoRate) return;
        applyRateLocal(currentRate);
        var vs = getAllVideos();
        for (var i = 0; i < vs.length; i++) forceVideoRate(vs[i], currentRate);
      });
      mo.observe(document, { childList: true, subtree: true });
    } catch (e) {}

    function setSpeed(r){
      forceAutoRate = true;
      currentRate = r;
      setRate(r);
      startRateKeeper();
    }

    var speeds = [0.5, 1, 1.25, 1.5, 1.75, 2, 3, 4, 8, 16];
    if (document.getElementById('force-speed-root')) return;
    var root = document.createElement('div');
    root.id = 'force-speed-root';
    root.style.cssText = 'position:fixed;top:80px;right:12px;z-index:2147483647;';
    document.documentElement.appendChild(root);

    var shadow = root.attachShadow({ mode: 'open' });
    shadow.innerHTML =
      '<style>' +
      ':host{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;}' +
      '.box{width:210px;background:rgba(18,18,24,0.96);color:#fff;border-radius:14px;box-shadow:0 6px 24px rgba(0,0,0,.45);overflow:hidden;font-size:13px;}' +
      '.head{padding:11px 12px;background:linear-gradient(135deg,#ff8a00,#ff3d00);display:flex;justify-content:space-between;align-items:center;font-weight:700;cursor:grab;touch-action:none;}' +
      '.head .t{display:flex;align-items:center;gap:6px;}' +
      '.close{opacity:.85;padding:0 4px;font-size:15px;}' +
      '.body{padding:12px;}' +
      '.label{opacity:.65;font-size:11px;margin-bottom:8px;}' +
      '.row{display:flex;flex-wrap:wrap;gap:6px;}' +
      '.btn{flex:1 1 28%;box-sizing:border-box;padding:9px 0;text-align:center;background:rgba(255,255,255,.13);border-radius:9px;cursor:pointer;touch-action:manipulation;}' +
      '.btn:active{background:#ff6a00;}' +
      '.btn.active{background:#ff6a00;font-weight:700;box-shadow:0 0 0 2px rgba(255,106,0,.5) inset;}' +
      '.off{margin-top:10px;width:100%;box-sizing:border-box;padding:10px 0;text-align:center;background:rgba(255,80,80,.28);border-radius:9px;cursor:pointer;touch-action:manipulation;}' +
      '.hint{font-size:10px;line-height:1.5;opacity:.55;margin-top:10px;}' +
      '.badge{position:fixed;right:12px;bottom:12px;width:46px;height:46px;border-radius:50%;background:linear-gradient(135deg,#ff8a00,#ff3d00);color:#fff;display:none;align-items:center;justify-content:center;font-size:22px;box-shadow:0 4px 16px rgba(0,0,0,.4);cursor:pointer;z-index:2147483647;touch-action:manipulation;}' +
      '</style>' +
      '<div class="box" id="box">' +
      '<div class="head" id="head"><span class="t">⚡ 强制倍速</span><span class="close" id="close">✕</span></div>' +
      '<div class="body">' +
      '<div class="label">点选倍速立即锁定（平台无法改回）</div>' +
      '<div class="row" id="row"></div>' +
      '<div class="off" id="off">关闭强制倍速</div>' +
      '<div class="hint">拖动标题栏可移动面板。原生接口+高频守护强制锁定，支持动态视频与同源/跨域 iframe。</div>' +
      '</div></div>' +
      '<div class="badge" id="badge">⚡</div>';

    var row = shadow.getElementById('row');
    var btns = {};
    speeds.forEach(function(r){
      var b = document.createElement('div');
      b.className = 'btn';
      b.textContent = r + 'x';
      b.addEventListener('click', function(){
        setSpeed(r);
        for (var k in btns) btns[k].classList.remove('active');
        b.classList.add('active');
      });
      row.appendChild(b);
      btns[r] = b;
    });

    shadow.getElementById('off').addEventListener('click', function(){
      forceAutoRate = false;
      stopRateKeeper();
      broadcastRate(-1);
      unlockVideos();
      for (var k in btns) btns[k].classList.remove('active');
    });

    var box = shadow.getElementById('box');
    var head = shadow.getElementById('head');
    var badge = shadow.getElementById('badge');

    shadow.getElementById('close').addEventListener('click', function(e){
      e.stopPropagation();
      box.style.display = 'none';
      badge.style.display = 'flex';
    });
    badge.addEventListener('click', function(){
      box.style.display = 'block';
      badge.style.display = 'none';
    });

    var dragging = false, sx, sy, il, it;
    head.addEventListener('pointerdown', function(e){
      if (e.target.classList.contains('close')) return;
      dragging = true;
      var rect = root.getBoundingClientRect();
      il = rect.left; it = rect.top; sx = e.clientX; sy = e.clientY;
      root.style.left = il + 'px'; root.style.top = it + 'px'; root.style.right = 'auto';
      try { head.setPointerCapture(e.pointerId); } catch (err) {}
      e.preventDefault();
    });
    head.addEventListener('pointermove', function(e){
      if (!dragging) return;
      var dx = e.clientX - sx, dy = e.clientY - sy;
      var nl = Math.max(0, Math.min(window.innerWidth - 60, il + dx));
      var nt = Math.max(0, Math.min(window.innerHeight - 40, it + dy));
      root.style.left = nl + 'px'; root.style.top = nt + 'px';
      e.preventDefault();
    });
    function endDrag(){ dragging = false; }
    head.addEventListener('pointerup', endDrag);
    head.addEventListener('pointercancel', endDrag);
  }
  initForceSpeed();
})();