// ==UserScript==
// @name         星特翻译插件
// @namespace    https://xiaote.design.blog/yhjb/xtfycj/
// @version      3.7
// @description  完全免费且简洁的翻译插件，支持悬浮按钮、状态切换、替换/增补翻译、智能判断等多项功能
// @author       小特_XT
// @match        *://*/*
// @grant        GM_getValue
// @grant        GM_setValue
// @grant        GM_registerMenuCommand
// @grant        GM_xmlhttpRequest
// @connect      edge.microsoft.com
// @connect      api.cognitive.microsofttranslator.com
// @license Apache-2.0
// ==/UserScript==

(function() {
  'use strict';

  const UA = 'Mozilla/5.0 (Linux; Android 16.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Edg/120.0.0.0';
  const LANG_MAP = {
    'zh-TW': 'zh-Hant', 'zh-CN': 'zh-Hans', 'tl': 'fil', 'sr': 'sr-Cyrl',
    'no': 'nb', 'mn': 'mn-Cyrl', 'hmn': 'mww', 'iw': 'he'
  };
  const REVERSE_LANG_MAP = {};
  for (const [k, v] of Object.entries(LANG_MAP)) {
    REVERSE_LANG_MAP[v] = k;
  }

  function normalizeLang(lang) {
    if (!lang) return '';
    const low = lang.toLowerCase();
    if (LANG_MAP[lang]) return lang;
    if (REVERSE_LANG_MAP[lang]) return REVERSE_LANG_MAP[lang];
    const simpleMap = { 'zh': 'zh-CN', 'zh-hans': 'zh-CN', 'zh-hant': 'zh-TW', 'jw': 'jv' };
    if (simpleMap[low]) return simpleMap[low];
    return lang;
  }

  const DEFAULTS = {
    targetLang: navigator.language.includes('zh') ? 'zh-CN' : 'en',
    transMode: 'replace',
    autoTranslate: true,
    sourceLang: 'auto',
    batchSize: 800,
    showBall: true,
    ballPos: { left: 30, top: 200 },
    smartAutoTranslate: true,
    autoTranslateThreshold: 0.8,
    perTextLanguageCheck: true,
    forceTranslate: false,
    translationEnabled: true,
    skipLinks: true           // 仅跳过文本中的网址，不影响<a>标签翻译
  };
  const Z_INDEX = '2147483647';

  function getSetting(key) {
    const val = GM_getValue(key);
    return val !== undefined ? val : DEFAULTS[key];
  }
  function saveSetting(key, value) { GM_setValue(key, value); }

  for (const k in DEFAULTS) {
    if (GM_getValue(k) === undefined) GM_setValue(k, DEFAULTS[k]);
  }

  // ---------- Toast 通知 ----------
  let toastTimer = null;
  function showToast(message, duration = 2000) {
    const existing = document.getElementById('mt-toast');
    if (existing) existing.remove();
    if (toastTimer) clearTimeout(toastTimer);

    const toast = document.createElement('div');
    toast.id = 'mt-toast';
    toast.textContent = message;
    toast.style.cssText = `
      position:fixed; bottom:80px; left:50%; transform:translateX(-50%);
      background:rgba(0,0,0,0.85); color:#fff; padding:10px 24px;
      border-radius:24px; font-size:14px; z-index:${Z_INDEX};
      pointer-events:none; font-family:system-ui, -apple-system, sans-serif;
    `;
    document.body.appendChild(toast);

    toastTimer = setTimeout(() => {
      toast.style.opacity = '0';
      toast.style.transition = 'opacity 0.3s';
      setTimeout(() => toast.remove(), 300);
    }, duration);
  }

  // ---------- Token 管理 ----------
  function parseTokenExp(token) {
    try {
      const payload = JSON.parse(atob(token.split('.')[1]));
      return payload.exp * 1000;
    } catch(e) { return -1; }
  }

  function httpGet(url) {
    return new Promise((resolve, reject) => {
      GM_xmlhttpRequest({ method: 'GET', url, headers: { 'User-Agent': UA }, onload: resolve, onerror: reject });
    });
  }

  function httpPost(url, body, token) {
    return new Promise((resolve, reject) => {
      GM_xmlhttpRequest({
        method: 'POST', url, data: body,
        headers: { 'User-Agent': UA, 'Authorization': 'Bearer ' + token, 'Content-Type': 'application/json' },
        onload: resolve, onerror: reject
      });
    });
  }

  async function fetchNewToken() {
    const res = await httpGet('https://edge.microsoft.com/translate/auth');
    if (res.status !== 200) throw new Error('Token 获取失败');
    const token = res.responseText;
    let exp = parseTokenExp(token);
    if (exp < Date.now()) exp = Date.now() + 600000;
    exp -= 30000;
    GM_setValue('token', token);
    GM_setValue('tokenExp', exp);
    return token;
  }

  async function getToken() {
    const token = GM_getValue('token');
    const exp = GM_getValue('tokenExp', 0);
    if (token && exp > Date.now()) return token;
    return await fetchNewToken();
  }

  async function batchTranslate(texts, from, to) {
    let fromLang = LANG_MAP[from] || from;
    let toLang = LANG_MAP[to] || to;
    let query = '?api-version=3.0&to=' + encodeURIComponent(toLang);
    if (fromLang !== 'auto') query += '&from=' + encodeURIComponent(fromLang);
    const body = JSON.stringify(texts.map(t => ({ Text: t })));
    let token = await getToken();
    let res = await httpPost('https://api.cognitive.microsofttranslator.com/translate' + query, body, token);
    if (res.status === 401) {
      GM_setValue('token', '');
      GM_setValue('tokenExp', 0);
      token = await fetchNewToken();
      res = await httpPost('https://api.cognitive.microsofttranslator.com/translate' + query, body, token);
    }
    if (res.status !== 200) throw new Error('翻译失败: ' + res.status);
    const data = JSON.parse(res.responseText);
    const translations = data.map(item => item.translations[0].text);
    const detectedLanguages = data.map(item => item.detectedLanguage?.language || '');
    return { translations, detectedLanguages };
  }

  // ---------- 页面翻译 ----------
  let isTranslating = false;
  let stopRequested = false;
  let translatedNodes = new Set();

  function shouldSkipNode(node) {
    const parent = node.parentElement;
    if (!parent) return true;
    const tag = parent.tagName.toLowerCase();
    if (['script','style','noscript','textarea','input','code','pre','kbd','samp','var','tt'].includes(tag)) return true;
    if (parent.closest('[data-mt-skip]')) return true;
    if (parent.classList.contains('notranslate') || parent.classList.contains('mt-processed')) return true;
    if (parent.isContentEditable) return true;
    if (parent.classList.contains('mt-translation')) return true;
    // 注意：不再跳过<a>标签，让链接文字正常翻译
    return false;
  }

  function collectTextNodes(root) {
    const nodes = [];
    const walker = document.createTreeWalker(root, NodeFilter.SHOW_TEXT, {
      acceptNode: (node) => {
        if (shouldSkipNode(node)) return NodeFilter.FILTER_REJECT;
        const text = node.textContent.trim();
        if (!text) return NodeFilter.FILTER_REJECT;
        return NodeFilter.FILTER_ACCEPT;
      }
    });
    while (walker.nextNode()) {
      nodes.push(walker.currentNode);
    }
    return nodes;
  }

  function fullReset() {
    stopRequested = true;
    const mode = getSetting('transMode');
    translatedNodes.forEach(node => {
      if (mode === 'replace' && node.__mtOriginal !== undefined) {
        node.textContent = node.__mtOriginal;
      }
      delete node.__mtOriginal;
      delete node.__mtTranslation;
    });
    document.querySelectorAll('.mt-translation').forEach(el => el.remove());
    document.querySelectorAll('[data-mt-translated]').forEach(el => el.removeAttribute('data-mt-translated'));
    translatedNodes.clear();
  }

  function restoreOriginalTexts() {
    const mode = getSetting('transMode');
    translatedNodes.forEach(node => {
      if (mode === 'replace' && node.__mtOriginal !== undefined) {
        node.textContent = node.__mtOriginal;
      }
    });
    document.querySelectorAll('.mt-translation').forEach(el => el.remove());
  }

  function applyCachedTranslations() {
    const mode = getSetting('transMode');
    translatedNodes.forEach(node => {
      if (node.__mtTranslation === undefined) return;
      const translation = node.__mtTranslation;
      if (mode === 'replace') {
        node.textContent = translation;
      } else {
        const parent = node.parentNode;
        if (!parent) return;
        let next = node.nextSibling;
        while (next) {
          if (next.classList && next.classList.contains('mt-translation')) {
            next.remove();
            next = node.nextSibling;
          } else {
            break;
          }
        }
        if (translation !== node.textContent) {
          const span = document.createElement('span');
          span.className = 'mt-translation';
          span.textContent = ' ' + translation;
          span.style.cssText = 'color:#666;font-style:italic;margin-left:4px;';
          parent.insertBefore(span, node.nextSibling);
        }
      }
    });
  }

  async function translatePageBatch() {
    if (!getSetting('translationEnabled')) {
      isTranslating = false;
      updateUI();
      return;
    }
    if (isTranslating) return;
    const mode = getSetting('transMode');
    const targetLang = getSetting('targetLang');
    const sourceLang = getSetting('sourceLang');
    const batchSize = getSetting('batchSize');
    const smartAuto = getSetting('smartAutoTranslate');
    const threshold = getSetting('autoTranslateThreshold');
    const perTextCheck = getSetting('perTextLanguageCheck');
    const forceTranslate = getSetting('forceTranslate');
    const skipLinks = getSetting('skipLinks');

    if (forceTranslate) {
      fullReset();
    }

    const textNodes = collectTextNodes(document.body);
    if (textNodes.length === 0) {
      isTranslating = false;
      updateUI();
      return;
    }

    isTranslating = true;
    stopRequested = false;
    updateUI();

    const textMap = new Map();
    for (const node of textNodes) {
      if (!forceTranslate && translatedNodes.has(node)) continue;
      const text = node.textContent.trim();
      if (!textMap.has(text)) textMap.set(text, []);
      textMap.get(text).push(node);
    }

    const uniqueTexts = [...textMap.keys()];
    if (uniqueTexts.length === 0) {
      isTranslating = false;
      updateUI();
      return;
    }

    // ---------- 智能处理文本中的纯网址 ----------
    const urlPlaceholderMap = new Map();
    let processedTexts = uniqueTexts;
    if (skipLinks) {
      const urlRegex = /https?:\/\/[^\s<>"]+/g;
      processedTexts = uniqueTexts.map((text, idx) => {
        const urls = text.match(urlRegex);
        if (urls && urls.length > 0) {
          const uniqueUrls = [...new Set(urls)];
          let placeholderText = text;
          uniqueUrls.forEach((url, i) => {
            const placeholder = `[#U${i}#]`;
            placeholderText = placeholderText.split(url).join(placeholder);
          });
          urlPlaceholderMap.set(idx, { urls: uniqueUrls });
          return placeholderText;
        }
        return text;
      });
    }

    if (smartAuto && processedTexts.length > 0) {
      const sampleSize = Math.min(processedTexts.length, batchSize);
      const sampleTexts = processedTexts.slice(0, sampleSize);
      try {
        const { detectedLanguages } = await batchTranslate(sampleTexts, 'auto', targetLang);
        let matchCount = 0;
        const normalizedTarget = normalizeLang(targetLang);
        for (const dl of detectedLanguages) {
          if (normalizeLang(dl) === normalizedTarget) matchCount++;
        }
        const ratio = matchCount / detectedLanguages.length;
        if (ratio >= threshold) {
          console.log(`智能跳过：${(ratio*100).toFixed(0)}% 的文本已是目标语言，停止翻译`);
          isTranslating = false;
          updateUI();
          return;
        }
      } catch(e) {
        console.warn('智能检测失败，继续翻译', e);
      }
    }

    const effectiveSourceLang = perTextCheck ? 'auto' : sourceLang;
    let translatedCount = 0;

    try {
      for (let i = 0; i < processedTexts.length; i += batchSize) {
        if (stopRequested) break;
        const batch = processedTexts.slice(i, i + batchSize);
        const { translations, detectedLanguages } = await batchTranslate(batch, effectiveSourceLang, targetLang);

        for (let j = 0; j < batch.length; j++) {
          if (stopRequested) break;
          const globalIdx = i + j;
          const original = uniqueTexts[globalIdx];
          let translation = translations[j];
          const detectedLang = normalizeLang(detectedLanguages[j] || '');
          const normalizedTarget = normalizeLang(targetLang);

          if (perTextCheck && detectedLang === normalizedTarget) continue;

          // 还原占位符为原网址
          if (urlPlaceholderMap.has(globalIdx)) {
            const { urls } = urlPlaceholderMap.get(globalIdx);
            urls.forEach((url, idx) => {
              const placeholder = `[#U${idx}#]`;
              const escaped = placeholder.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
              translation = translation.replace(new RegExp(escaped, 'gi'), url);
            });
          }

          const nodes = textMap.get(original);
          nodes.forEach(node => {
            if (!forceTranslate && translatedNodes.has(node)) return;
            translatedNodes.add(node);

            if (node.__mtOriginal === undefined) {
              node.__mtOriginal = node.textContent;
            }
            node.__mtTranslation = translation;

            if (mode === 'replace') {
              node.textContent = translation;
            } else {
              if (translation !== original) {
                const span = document.createElement('span');
                span.className = 'mt-translation';
                span.textContent = ' ' + translation;
                span.style.cssText = 'color:#666;font-style:italic;margin-left:4px;';
                if (node.parentNode) {
                  node.parentNode.insertBefore(span, node.nextSibling);
                }
              }
            }
            if (node.parentElement && !node.parentElement.hasAttribute('data-mt-translated')) {
              node.parentElement.setAttribute('data-mt-translated', '1');
            }
            translatedCount++;
          });
        }
        if (i + batchSize < processedTexts.length) await new Promise(r => setTimeout(r, 100));
      }
    } catch(e) {
      console.error('翻译出错:', e);
      showToast('翻译出错: ' + e.message, 3000);
    } finally {
      isTranslating = false;
      stopRequested = false;
      updateUI();
    }
  }

  function stopTranslation() {
    stopRequested = true;
    showToast('已停止翻译');
  }

  function toggleTranslationEnabled() {
    const newVal = !getSetting('translationEnabled');
    saveSetting('translationEnabled', newVal);
    stopRequested = true;

    if (newVal) {
      applyCachedTranslations();
      showToast('翻译已启用');
      updateUI();
      if (translatedNodes.size === 0 && getSetting('autoTranslate')) {
        translatePageBatch();
      }
    } else {
      restoreOriginalTexts();
      showToast('翻译已禁用，已恢复原文');
      updateUI();
    }
  }

  // ---------- 悬浮球 UI ----------
  let container, ball, panel, panelVisible = false;
  const BALL_SIZE = 32;
  const SVG_ICON = `<svg viewBox="0 0 24 24" width="16" height="16" fill="white"><path d="M12.87 15.07l-2.54-2.51.03-.03A17.52 17.52 0 0014.07 6H17V4h-7V2H8v2H1v2h11.17C11.5 7.92 10.44 9.75 9 11.35 8.07 10.32 7.3 9.19 6.69 8h-2c.73 1.63 1.73 3.17 2.98 4.56l-5.09 5.02L4 19l5-5 3.11 3.11.76-2.04zM18.5 10h-2L12 22h2l1.12-3h4.75L21 22h2l-4.5-12zm-2.62 7l1.62-4.33L19.12 17h-3.24z"/></svg>`;

  function createBall() {
    container = document.createElement('div');
    container.id = 'mt-float-container';
    container.style.cssText = `
      position:fixed; z-index:${Z_INDEX}; transition: left 0.2s ease, top 0.2s ease;
      user-select:none; -webkit-tap-highlight-color:transparent;
    `;
    const pos = getSetting('ballPos');
    container.style.left = pos.left + 'px';
    container.style.top = pos.top + 'px';

    ball = document.createElement('div');
    ball.id = 'mt-float-ball';
    ball.innerHTML = SVG_ICON;
    ball.style.cssText = `
      width:${BALL_SIZE}px;height:${BALL_SIZE}px;border-radius:50%;background:#ff6a00;
      display:flex;align-items:center;justify-content:center;cursor:pointer;
      border:1px solid #e05d00;user-select:none;touch-action:none;
      -webkit-tap-highlight-color:transparent;
      transition: background 0.2s, transform 0.2s;
    `;

    let startX, startY, initLeft, initTop, dragging = false;
    ball.addEventListener('pointerdown', (e) => {
      if (e.target.tagName === 'BUTTON' || e.target.closest('button')) return;
      e.preventDefault();
      ball.setPointerCapture(e.pointerId);
      startX = e.clientX; startY = e.clientY;
      const rect = container.getBoundingClientRect();
      initLeft = rect.left; initTop = rect.top;
      dragging = false;
      container.style.transition = 'none';
      ball.addEventListener('pointermove', onMove);
      ball.addEventListener('pointerup', onUp);
    });

    function onMove(e) {
      const dx = e.clientX - startX;
      const dy = e.clientY - startY;
      if (Math.abs(dx) > 3 || Math.abs(dy) > 3) dragging = true;
      let left = initLeft + dx;
      let top = initTop + dy;
      left = Math.max(0, Math.min(window.innerWidth - BALL_SIZE, left));
      top = Math.max(0, Math.min(window.innerHeight - BALL_SIZE, top));
      container.style.left = left + 'px';
      container.style.top = top + 'px';
    }

    function onUp(e) {
      ball.removeEventListener('pointermove', onMove);
      ball.removeEventListener('pointerup', onUp);
      container.style.transition = 'left 0.3s ease, top 0.3s ease';
      const rect = container.getBoundingClientRect();
      const centerX = rect.left + BALL_SIZE/2;
      let finalLeft = rect.left;
      if (centerX < 60) finalLeft = -BALL_SIZE/2;
      else if (centerX > window.innerWidth - 60) finalLeft = window.innerWidth - BALL_SIZE/2;
      finalLeft = Math.max(-BALL_SIZE/2, Math.min(window.innerWidth - BALL_SIZE/2, finalLeft));
      container.style.left = finalLeft + 'px';
      container.style.top = rect.top + 'px';
      saveSetting('ballPos', { left: finalLeft, top: rect.top });
    }

    ball.addEventListener('click', () => {
      if (dragging) return;
      const curLeft = parseFloat(container.style.left);
      if (curLeft < 0 || curLeft > window.innerWidth - BALL_SIZE) {
        const newLeft = curLeft < 0 ? 10 : window.innerWidth - BALL_SIZE - 10;
        container.style.left = newLeft + 'px';
        saveSetting('ballPos', { left: newLeft, top: parseFloat(container.style.top) });
      }
      panelVisible = !panelVisible;
      if (panelVisible) {
        updatePanelPosition();
        panel.style.display = 'block';
        requestAnimationFrame(() => {
          panel.style.opacity = '1';
          panel.style.transform = 'translateY(0)';
        });
      } else {
        panel.style.opacity = '0';
        panel.style.transform = 'translateY(10px)';
        setTimeout(() => { if (!panelVisible) panel.style.display = 'none'; }, 300);
      }
    });

    panel = document.createElement('div');
    panel.id = 'mt-float-panel';
    panel.style.cssText = `
      display:none; opacity:0; transform:translateY(10px);
      position:absolute; min-width:200px; max-width:280px;
      background:#ffffff;
      border:1px solid #d0d0d0; border-radius:16px; overflow:hidden;
      user-select:none; -webkit-tap-highlight-color:transparent;
      transition: opacity 0.3s ease, transform 0.3s ease;
      z-index:${Z_INDEX};
    `;

    container.appendChild(ball);
    container.appendChild(panel);
    document.body.appendChild(container);
    updateUI();
  }

  function removeBall() {
    if (container) {
      container.remove();
      container = ball = panel = null;
      panelVisible = false;
    }
  }

  function resetBallPosition() {
    const left = 16;
    const top = Math.round(window.innerHeight / 3);
    saveSetting('ballPos', { left, top });
    if (container) {
      container.style.left = left + 'px';
      container.style.top = top + 'px';
    }
    showToast('悬浮球已复位居中');
  }

  function updatePanelPosition() {
    if (!container || !panel) return;
    const ballRect = container.getBoundingClientRect();
    const panelWidth = panel.offsetWidth || 200;
    const panelHeight = panel.offsetHeight || 200;
    const margin = 10;

    const rightSpace = window.innerWidth - ballRect.right;
    if (rightSpace >= panelWidth + margin) {
      panel.style.right = '0';
      panel.style.left = 'auto';
    } else {
      const leftSpace = ballRect.left;
      if (leftSpace >= panelWidth + margin) {
        panel.style.left = -(panelWidth - BALL_SIZE) + 'px';
        panel.style.right = 'auto';
      } else {
        panel.style.left = -((panelWidth - BALL_SIZE) / 2) + 'px';
        panel.style.right = 'auto';
      }
    }

    const topSpace = ballRect.top;
    if (topSpace >= panelHeight + margin) {
      panel.style.bottom = (BALL_SIZE + margin) + 'px';
      panel.style.top = 'auto';
    } else {
      panel.style.top = (BALL_SIZE + margin) + 'px';
      panel.style.bottom = 'auto';
    }
  }

  function updateUI() {
    if (!panel) return;
    const oldContent = panel.firstChild;
    if (oldContent) panel.removeChild(oldContent);
    const content = document.createElement('div');
    content.style.cssText = 'padding:12px;display:flex;flex-direction:column;gap:8px;';
    panel.appendChild(content);

    const modeText = getSetting('transMode') === 'replace' ? '替换原文' : '补充翻译';
    const autoText = getSetting('autoTranslate') ? '自动翻译: 开' : '自动翻译: 关';
    const enabledText = getSetting('translationEnabled') ? '翻译: 开' : '翻译: 关';

    const buttons = [
      { id: 'mt-btn-translate', text: '翻译此页' },
      { id: 'mt-btn-stop', text: '停止翻译', style: isTranslating ? 'color:#ff6a00;font-weight:bold;' : '' },
      { id: 'mt-btn-toggle-enable', text: enabledText },
      { id: 'mt-btn-toggle-auto', text: autoText },
      { id: 'mt-btn-toggle-mode', text: `切换模式: ${modeText}` },
      { id: 'mt-btn-reset', text: '复位位置' },
      { id: 'mt-btn-settings', text: '设置' }
    ];

    buttons.forEach(({id, text, style}) => {
      const btn = document.createElement('button');
      btn.id = id;
      btn.textContent = text;
      btn.style.cssText = `
        width:100%; padding:10px 12px; border:1px solid #d0d0d0;
        border-radius:16px; background:#ffffff;
        cursor:pointer; font-size:14px; text-align:left; color:#333;
        user-select:none; -webkit-tap-highlight-color:transparent;
        transition: background 0.2s;
        ${style || ''}
      `;
      btn.addEventListener('mouseenter', ()=> btn.style.background='#f0f0f0');
      btn.addEventListener('mouseleave', ()=> btn.style.background='#ffffff');
      btn.addEventListener('pointerdown', (e) => e.stopPropagation());
      content.appendChild(btn);
    });

    content.querySelector('#mt-btn-translate').addEventListener('click', () => { hidePanel(); translatePageBatch(); });
    content.querySelector('#mt-btn-stop').addEventListener('click', () => { stopTranslation(); hidePanel(); });
    content.querySelector('#mt-btn-toggle-enable').addEventListener('click', () => {
      hidePanel();
      toggleTranslationEnabled();
    });
    content.querySelector('#mt-btn-toggle-auto').addEventListener('click', () => {
      saveSetting('autoTranslate', !getSetting('autoTranslate'));
      hidePanel(); updateUI();
    });
    content.querySelector('#mt-btn-toggle-mode').addEventListener('click', () => {
      const cur = getSetting('transMode');
      saveSetting('transMode', cur === 'replace' ? 'append' : 'replace');
      hidePanel(); updateUI();
    });
    content.querySelector('#mt-btn-reset').addEventListener('click', () => { resetBallPosition(); hidePanel(); });
    content.querySelector('#mt-btn-settings').addEventListener('click', () => { hidePanel(); openSettings(); });

    if (ball) {
      if (!getSetting('translationEnabled')) {
        ball.style.background = '#999';
        ball.style.borderColor = '#777';
      } else if (isTranslating) {
        ball.style.background = '#cc5500';
      } else {
        ball.style.background = '#ff6a00';
        ball.style.borderColor = '#e05d00';
      }
    }
  }

  function hidePanel() {
    panelVisible = false;
    if (panel) {
      panel.style.opacity = '0';
      panel.style.transform = 'translateY(10px)';
      setTimeout(() => { if (!panelVisible) panel.style.display = 'none'; }, 300);
    }
  }

  // ---------- 设置面板 ----------
  function buildSettingsHTML() {
    const s = {
      sourceLang: getSetting('sourceLang'),
      targetLang: getSetting('targetLang'),
      transMode: getSetting('transMode'),
      autoTranslate: getSetting('autoTranslate'),
      showBall: getSetting('showBall'),
      batchSize: getSetting('batchSize'),
      smartAutoTranslate: getSetting('smartAutoTranslate'),
      autoTranslateThreshold: getSetting('autoTranslateThreshold'),
      perTextLanguageCheck: getSetting('perTextLanguageCheck'),
      forceTranslate: getSetting('forceTranslate'),
      translationEnabled: getSetting('translationEnabled'),
      skipLinks: getSetting('skipLinks')
    };

    const langList = [
      ['auto','自动检测'],['zh-CN','中文简体'],['zh-TW','中文繁体'],['en','英语'],['ru','俄语'],['uk','乌克兰语'],
      ['af','南非荷兰语'],['am','阿姆哈拉语'],['ar','阿拉伯语'],['az','阿塞拜疆语'],['bg','保加利亚语'],
      ['bn','孟加拉语'],['bs','波斯尼亚语'],['ca','加泰罗尼亚语'],['cs','捷克语'],['cy','威尔士语'],
      ['da','丹麦语'],['de','德语'],['el','希腊语'],['es','西班牙语'],['et','爱沙尼亚语'],
      ['eu','巴斯克语'],['fa','波斯语'],['fi','芬兰语'],['fr','法语'],['ga','爱尔兰语'],
      ['gl','加利西亚语'],['gu','古吉拉特语'],['ha','豪萨语'],['hi','印地语'],['hmn','苗语'],
      ['hr','克罗地亚语'],['ht','海地克里奥尔语'],['hu','匈牙利语'],['hy','亚美尼亚语'],['id','印尼语'],
      ['ig','伊博语'],['is','冰岛语'],['it','意大利语'],['iw','希伯来语'],['ja','日语'],
      ['ka','格鲁吉亚语'],['kk','哈萨克语'],['km','高棉语'],['kn','卡纳达语'],['ko','韩语'],
      ['ky','吉尔吉斯语'],['lo','老挝语'],['lt','立陶宛语'],['lv','拉脱维亚语'],['mi','毛利语'],
      ['mk','马其顿语'],['ml','马拉雅拉姆语'],['mn','蒙古语'],['mr','马拉地语'],['ms','马来语'],
      ['my','缅甸语'],['ne','尼泊尔语'],['nl','荷兰语'],['no','挪威语'],['pa','旁遮普语'],
      ['pl','波兰语'],['ps','普什图语'],['pt','葡萄牙语'],['ro','罗马尼亚语'],['sd','信德语'],
      ['si','僧伽罗语'],['sk','斯洛伐克语'],['sl','斯洛文尼亚语'],['sm','萨摩亚语'],['sn','绍纳语'],
      ['so','索马里语'],['sq','阿尔巴尼亚语'],['sr','塞尔维亚语'],['st','塞索托语'],['sv','瑞典语'],
      ['sw','斯瓦希里语'],['ta','泰米尔语'],['te','泰卢固语'],['th','泰语'],['tl','菲律宾语'],
      ['tr','土耳其语'],['tt','鞑靼语'],['ug','维吾尔语'],['ur','乌尔都语'],['uz','乌兹别克语'],
      ['vi','越南语'],['xh','科萨语'],['yo','约鲁巴语']
    ];

    const langOptions = (selected, isSource) => {
      return langList.filter(([code]) => isSource || code !== 'auto').map(([code, name]) => {
        const sel = code === selected ? ' selected' : '';
        return `<option value="${code}"${sel}>${name}</option>`;
      }).join('');
    };

    return `
      <style>
        .mt-settings-overlay {
          position:fixed; top:0; left:0; width:100%; height:100%;
          background:rgba(0,0,0,0.3);
          z-index:${Z_INDEX}; display:flex; align-items:center; justify-content:center;
        }
        .mt-settings-panel {
          background:#ffffff;
          border:1px solid #d0d0d0; border-radius:16px; padding:24px; width:90%; max-width:420px; max-height:80vh; overflow-y:auto;
          user-select:none; -webkit-tap-highlight-color:transparent;
        }
        .mt-settings-panel h3 { margin-top:0; }
        .mt-setting-item { margin-bottom:16px; }
        .mt-setting-item label { display:block; font-weight:bold; margin-bottom:6px; }
        .mt-setting-item select, .mt-setting-item input[type="number"] {
          width:100%; padding:8px; border:1px solid #d0d0d0; border-radius:16px;
          font-size:14px; background:#ffffff;
        }
        .mt-setting-item.checkbox { display:flex; align-items:center; gap:10px; }
        .mt-setting-item.checkbox label { margin-bottom:0; }
        .mt-settings-buttons { display:flex; gap:10px; margin-top:20px; }
        .mt-settings-buttons button {
          flex:1; padding:10px; border:1px solid #d0d0d0; border-radius:16px;
          background:#ffffff;
          cursor:pointer; font-size:14px; user-select:none; -webkit-tap-highlight-color:transparent;
          transition: background 0.2s;
        }
        .mt-settings-buttons button.primary { background:#ff6a00; color:#fff; border-color:#ff6a00; }
        .mt-settings-buttons button:hover { background:#f0f0f0; }
        .mt-settings-buttons button.primary:hover { background:#e05d00; }
      </style>
      <div class="mt-settings-panel">
        <h3 style="color:#ff6a00;">翻译助手设置</h3>
        <div class="mt-setting-item checkbox">
          <input type="checkbox" id="mt-set-enabled" ${s.translationEnabled?'checked':''}>
          <label for="mt-set-enabled">启用翻译</label>
        </div>
        <div class="mt-setting-item checkbox">
          <input type="checkbox" id="mt-set-auto" ${s.autoTranslate?'checked':''}>
          <label for="mt-set-auto">自动翻译</label>
        </div>
        <div class="mt-setting-item checkbox">
          <input type="checkbox" id="mt-set-force" ${s.forceTranslate?'checked':''}>
          <label for="mt-set-force">强制重新翻译（忽略已翻译状态）</label>
        </div>
        <div class="mt-setting-item checkbox">
          <input type="checkbox" id="mt-set-smart-auto" ${s.smartAutoTranslate?'checked':''}>
          <label for="mt-set-smart-auto">智能跳过已翻译页面</label>
        </div>
        <div class="mt-setting-item">
          <label>相似度阈值 (0-1，如0.8表示80%)</label>
          <input type="number" id="mt-set-threshold" value="${s.autoTranslateThreshold}" min="0" max="1" step="0.05">
        </div>
        <div class="mt-setting-item checkbox">
          <input type="checkbox" id="mt-set-per-check" ${s.perTextLanguageCheck?'checked':''}>
          <label for="mt-set-per-check">逐条检测语言（相同跳过）</label>
        </div>
        <div class="mt-setting-item checkbox">
          <input type="checkbox" id="mt-set-ball" ${s.showBall?'checked':''}>
          <label for="mt-set-ball">显示悬浮球</label>
        </div>
        <div class="mt-setting-item checkbox">
          <input type="checkbox" id="mt-set-skip-links" ${s.skipLinks?'checked':''}>
          <label for="mt-set-skip-links">不翻译纯文本网址（如 https://...）</label>
        </div>
        <div class="mt-setting-item">
          <label>翻译模式</label>
          <select id="mt-set-mode">
            <option value="replace" ${s.transMode==='replace'?'selected':''}>替换原文</option>
            <option value="append" ${s.transMode==='append'?'selected':''}>补充翻译</option>
          </select>
        </div>
        <div class="mt-setting-item">
          <label>原文语言</label>
          <select id="mt-set-from">${langOptions(s.sourceLang, true)}</select>
        </div>
        <div class="mt-setting-item">
          <label>目标语言</label>
          <select id="mt-set-to">${langOptions(s.targetLang, false)}</select>
        </div>
        <div class="mt-setting-item">
          <label>批量大小 (10-1000)</label>
          <input type="number" id="mt-set-batch" value="${s.batchSize}" min="10" max="1000">
        </div>
        <div class="mt-settings-buttons">
          <button id="mt-save-btn" class="primary">保存</button>
          <button id="mt-close-btn">关闭</button>
        </div>
      </div>
    `;
  }

  function openSettings() {
    const existing = document.querySelector('.mt-settings-overlay');
    if (existing) existing.remove();

    const overlay = document.createElement('div');
    overlay.className = 'mt-settings-overlay';
    overlay.innerHTML = buildSettingsHTML();
    document.body.appendChild(overlay);

    overlay.querySelector('#mt-close-btn').addEventListener('click', () => overlay.remove());
    overlay.querySelector('#mt-save-btn').addEventListener('click', () => {
      const enabled = overlay.querySelector('#mt-set-enabled').checked;
      const auto = overlay.querySelector('#mt-set-auto').checked;
      const force = overlay.querySelector('#mt-set-force').checked;
      const smartAuto = overlay.querySelector('#mt-set-smart-auto').checked;
      const threshold = parseFloat(overlay.querySelector('#mt-set-threshold').value) || 0.8;
      const perCheck = overlay.querySelector('#mt-set-per-check').checked;
      const ballShow = overlay.querySelector('#mt-set-ball').checked;
      const mode = overlay.querySelector('#mt-set-mode').value;
      const from = overlay.querySelector('#mt-set-from').value;
      const to = overlay.querySelector('#mt-set-to').value;
      const batch = parseInt(overlay.querySelector('#mt-set-batch').value, 10) || 800;
      const skipLinks = overlay.querySelector('#mt-set-skip-links').checked;

      const oldEnabled = getSetting('translationEnabled');
      saveSetting('translationEnabled', enabled);
      saveSetting('autoTranslate', auto);
      saveSetting('forceTranslate', force);
      saveSetting('smartAutoTranslate', smartAuto);
      saveSetting('autoTranslateThreshold', threshold);
      saveSetting('perTextLanguageCheck', perCheck);
      saveSetting('showBall', ballShow);
      saveSetting('transMode', mode);
      saveSetting('sourceLang', from);
      saveSetting('targetLang', to);
      saveSetting('batchSize', batch);
      saveSetting('skipLinks', skipLinks);

      if (ballShow) {
        if (!container) createBall();
      } else {
        removeBall();
      }

      if (!enabled && oldEnabled) {
        restoreOriginalTexts();
      }

      overlay.remove();
      updateUI();

      if (enabled && auto && translatedNodes.size === 0) {
        setTimeout(translatePageBatch, 500);
      }
    });

    overlay.addEventListener('click', (e) => {
      if (e.target === overlay) overlay.remove();
    });
  }

  // ---------- 页面切换监听 ----------
  let pageChangeTimer = null;
  function handlePossiblePageChange() {
    if (pageChangeTimer) clearTimeout(pageChangeTimer);
    pageChangeTimer = setTimeout(() => {
      pageChangeTimer = null;
      if (!getSetting('translationEnabled')) return;
      fullReset();
      if (getSetting('autoTranslate')) {
        setTimeout(translatePageBatch, 500);
      }
    }, 200);
  }

  const origPushState = history.pushState;
  history.pushState = function(...args) {
    origPushState.apply(this, args);
    handlePossiblePageChange();
  };
  const origReplaceState = history.replaceState;
  history.replaceState = function(...args) {
    origReplaceState.apply(this, args);
    handlePossiblePageChange();
  };
  window.addEventListener('popstate', handlePossiblePageChange);
  window.addEventListener('hashchange', handlePossiblePageChange);

  // ---------- 油猴菜单 ----------
  GM_registerMenuCommand('启用/禁用翻译', toggleTranslationEnabled);
  GM_registerMenuCommand('切换自动翻译', () => {
    const val = !getSetting('autoTranslate');
    saveSetting('autoTranslate', val);
    showToast('自动翻译: ' + (val ? '开' : '关'));
    updateUI();
  });
  GM_registerMenuCommand('切换翻译模式', () => {
    const cur = getSetting('transMode');
    const newMode = cur === 'replace' ? 'append' : 'replace';
    saveSetting('transMode', newMode);
    showToast('翻译模式: ' + (newMode === 'replace' ? '替换原文' : '补充翻译'));
    updateUI();
  });
  GM_registerMenuCommand('显示/隐藏悬浮球', () => {
    const show = !getSetting('showBall');
    saveSetting('showBall', show);
    if (show) {
      if (!container) createBall();
      showToast('悬浮球已显示');
    } else {
      removeBall();
      showToast('悬浮球已隐藏');
    }
  });
  GM_registerMenuCommand('切换纯文本网址跳过', () => {
    const val = !getSetting('skipLinks');
    saveSetting('skipLinks', val);
    showToast('跳过纯文本网址: ' + (val ? '开' : '关'));
  });
  GM_registerMenuCommand('复位悬浮球位置', resetBallPosition);
  GM_registerMenuCommand('插件设置', openSettings);

  // ---------- 初始化 ----------
  function init() {
    if (!document.body) {
      document.addEventListener('DOMContentLoaded', init);
      return;
    }
    if (getSetting('showBall')) createBall();
    if (getSetting('autoTranslate') && getSetting('translationEnabled')) {
      if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', () => setTimeout(translatePageBatch, 800));
      } else {
        setTimeout(translatePageBatch, 800);
      }
    }
  }

  init();

})();