// ==UserScript==
// @name         GitHub 中文化 (繁體)
// @namespace    https://github.com/scriptscat/scriptcat
// @version      0.15
// @description  幫 GitHub 導覽列、按鈕、屬性換成繁體中文，支援 SPA 動態更新，不亂翻、不卡頓。
// @match        https://github.com/*
// @run-at       document-idle
// @grant        none
// ==/UserScript==

(() => {
  'use strict';

  const TRANSLATION_MAP = new Map([
    // 倉庫導覽
    ['Code', '原始碼'],
    ['Issues', '問題'],
    ['Pull requests', '拉取請求'],
    ['Pull request', '拉取請求'],
    ['Pulls', '拉取請求'],
    ['Discussions', '討論'],
    ['Actions', '動作'],
    ['Projects', '專案'],
    ['Security', '安全'],
    ['Security and quality', '安全與品質'],
    ['Code scanning', '程式碼掃描'],
    ['Secret scanning', '密鑰掃描'],
    ['Dependabot', 'Dependabot'],
    ['Insights', '洞察'],
    ['Pulse', '脈動'],
    ['Settings', '設定'],
    ['Wiki', '維基'],
    ['Overview', '總覽'],
    ['Repositories', '倉庫'],
    ['Repository', '倉庫'],
    ['Followers', '追蹤者'],

    // 關注 / 分支 / 星標
    ['Watch', '關注'],
    ['Watching', '關注中'],
    ['Unwatch', '取消關注'],
    ['Fork', '分支'],
    ['Forks', '分支數'],
    ['Forked', '已分支'],
    ['Star', '星標'],
    ['Starred', '已標星'],
    ['Stars', '星標數'],
    ['Unstar', '取消星標'],
    ['stars', '星標'],
    ['watching', '關注中'],
    ['forks', '分支'],
    ['Sponsor', '贊助'],
    ['Sponsors', '贊助者'],
    ['Sponsor this project', '贊助此專案'],
    ['Learn more about GitHub Sponsors', '進一步了解 GitHub Sponsors'],

    // 倉庫頁面側欄
    ['About', '關於'],
    ['Readme', '自述檔'],
    ['License', '授權'],
    ['MIT license', 'MIT 授權'],
    ['Apache-2.0 license', 'Apache-2.0 授權'],
    ['GPL-3.0 license', 'GPL-3.0 授權'],
    ['BSD-3-Clause license', 'BSD-3-Clause 授權'],
    ['Activity', '活動'],
    ['Custom properties', '自訂屬性'],
    ['Releases', '版本'],
    ['No releases published', '尚未發佈版本'],
    ['Contributors', '貢獻者'],
    ['Languages', '語言'],
    ['Packages', '套件'],
    ['No packages published', '尚未發佈套件'],
    ['Deployments', '部署'],
    ['Environments', '環境'],
    ['Report repository', '檢舉此倉庫'],
    ['Resources', '資源'],
    ['Citation', '引用'],
    ['Cite this repository', '引用此倉庫'],
    ['Contributing', '貢獻'],
    ['Code of conduct', '行為準則'],

    // 檔案列表操作
    ['Go to file', '前往檔案'],
    ['Add file', '新增檔案'],
    ['Create new file', '新增檔案'],
    ['Upload files', '上傳檔案'],
    ['Find file', '搜尋檔案'],
    ['Clone', '複製'],
    ['Download ZIP', '下載 ZIP'],
    ['Open with GitHub Desktop', '以 GitHub Desktop 開啟'],
    ['Latest commit', '最新提交'],
    ['Commits', '提交'],
    ['Commit', '提交'],
    ['Branches', '分支'],
    ['Branch', '分支'],
    ['Default', '預設'],
    ['Active', '活躍'],
    ['Stale', '過時'],
    ['All', '全部'],
    ['Yours', '我的'],
    ['Active branches', '活躍分支'],
    ['Stale branches', '過時分支'],
    ['All branches', '所有分支'],
    ['Your branches', '我的分支'],
    ['Search branches', '搜尋分支'],
    ['Search branches...', '搜尋分支…'],
    ['New branch', '新增分支'],
    ['Delete branch', '刪除分支'],
    ['Rename branch', '重新命名分支'],
    ['Restore branch', '還原分支'],
    ['View all branches', '檢視所有分支'],
    ['No branches match the search', '沒有分支符合搜尋條件'],
    ['No branches', '沒有分支'],
    ['No results matched your search', '沒有結果符合你的搜尋'],
    ['No results found', '找不到結果'],
    ['Nothing to show', '沒有可顯示的內容'],
    ['No commits', '尚無提交'],
    ['No issues', '沒有問題'],
    ['No pull requests', '沒有拉取請求'],
    ['No open issues', '沒有開啟中的問題'],
    ['No open pull requests', '沒有開啟中的拉取請求'],
    ['No tags', '沒有標籤'],
    ['No matches found', '找不到符合項目'],
    ['Previous', '上一頁'],
    ['Next', '下一頁'],
    ['Loading', '載入中'],
    ['Updated', '更新時間'],
    ['Check status', '檢查狀態'],
    ['Behind', '落後'],
    ['Ahead', '領先'],
    ['Pull request', '拉取請求'],
    ['Tags', '標籤'],
    ['Tag', '標籤'],

    // PR / Issue 常見按鈕
    ['New issue', '開新問題'],
    ['New pull request', '開新拉取請求'],
    ['Compare', '比較'],
    ['Merge', '合併'],
    ['Merge pull request', '合併拉取請求'],
    ['Squash and merge', '壓縮後合併'],
    ['Rebase and merge', '重定基底後合併'],
    ['Create a merge commit', '建立合併提交'],
    ['Close issue', '關閉問題'],
    ['Close pull request', '關閉拉取請求'],
    ['Reopen issue', '重新開啟問題'],
    ['Comment', '留言'],
    ['Review changes', '審查變更'],
    ['Files changed', '變更檔案'],
    ['Conversation', '對話'],
    ['Checks', '檢查'],

    // 列表篩選
    ['Open', '開啟中'],
    ['Closed', '已關閉'],
    ['Author', '作者'],
    ['Labels', '標籤'],
    ['Label', '標籤'],
    ['Milestones', '里程碑'],
    ['Milestone', '里程碑'],
    ['Assignee', '指派對象'],
    ['Assignees', '指派對象'],
    ['Reviewer', '審查者'],
    ['Reviewers', '審查者'],
    ['Sort', '排序'],
    ['Sort by', '排序依據'],
    ['Order', '順序'],
    ['Newest', '最新'],
    ['Oldest', '最舊'],
    ['Created on', '建立時間'],
    ['Last updated', '最後更新時間'],
    ['Most commented', '留言最多'],
    ['Total comments', '留言總數'],
    ['Best match', '最佳匹配'],
    ['Reactions', '反應'],
    ['Most reactions', '反應最多'],
    ['Recently updated', '最近更新'],
    ['Dismiss', '關閉提示'],
    ['Want to contribute to', '想貢獻給'],
    ['If you have a bug or an idea, read the contributing guidelines before opening an issue', '若您發現錯誤或有新想法，請先閱讀貢獻指引再開啟問題'],
    ['read the contributing guidelines', '請閱讀貢獻指引'],
    ['contributing guidelines', '貢獻指引'],
    ['before opening an issue', '再開啟問題'],
    ['Never', '從未'],
    ['Everyone', '所有人'],
    ['Anyone', '任何人'],

    // 全站導覽 / 使用者選單
    ['Pull', '拉取'],
    ['Marketplace', '市集'],
    ['Explore', '探索'],
    ['Your profile', '個人頁面'],
    ['Your repositories', '我的倉庫'],
    ['Your organizations', '我的組織'],
    ['Your projects', '我的專案'],
    ['Your stars', '我的星標'],
    ['Your gists', '我的程式片段'],
    ['Your sponsors', '我的贊助者'],
    ['Upgrade', '升級'],
    ['Feature preview', '功能預覽'],
    ['Help', '說明'],
    ['Sign out', '登出'],
    ['Sign in', '登入'],

    // 通用動作
    ['Save', '儲存'],
    ['Cancel', '取消'],
    ['Delete', '刪除'],
    ['Edit', '編輯'],
    ['Update', '更新'],
    ['Create', '建立'],
    ['Submit', '送出'],
    ['Search', '搜尋'],
    ['Filter', '篩選'],
    ['Filters', '篩選'],
    ['Follow', '追蹤'],
    ['Following', '追蹤中'],
    ['Unfollow', '取消追蹤'],
    ['Block or Report', '封鎖或檢舉'],

    // 頁尾 / 無障礙
    ['Footer', '頁尾'],
    ['Footer navigation', '頁尾導覽'],
    ['GitHub Homepage', 'GitHub 首頁'],
    ['Terms', '服務條款'],
    ['Privacy', '隱私'],
    ['Status', '狀態'],
    ['Community', '社群'],
    ['Docs', '文件'],
    ['Contact', '聯絡我們'],
    ['Manage cookies', '管理 Cookie'],
    ['Do not share my personal information', '不要分享我的個人資訊'],
    ['Skip to content', '跳至內容'],

    // 相對時間
    ['yesterday', '昨天'],
    ['today', '今天'],
    ['tomorrow', '明天'],
    ['now', '剛剛'],
    ['just now', '剛才'],
    ['last week', '上週'],
    ['last month', '上個月'],
    ['last year', '去年'],
    ['this week', '本週'],
    ['this month', '本月'],
    ['this year', '今年'],
  ]);

  const TIME_UNITS = {
    second: '秒', minute: '分鐘', hour: '小時',
    day: '天', week: '週', month: '個月', year: '年',
  };
  const TIME_AGO_REGEX = /\b(\d+)\s+(second|minute|hour|day|week|month|year)s?\s+ago\b/gi;
  const TIME_AGO_ARTICLE_REGEX = /\b(a|an)\s+(second|minute|hour|day|week|month|year)\s+ago\b/gi;

  // 這些標籤的文字節點不翻（避免動到原始碼、編輯器）；但它們的屬性（如 placeholder）仍會翻。
  const SKIP_TAGS = new Set(['SCRIPT', 'STYLE', 'CODE', 'PRE', 'TEXTAREA', 'INPUT', 'NOSCRIPT']);
  const ATTRIBUTES_TO_TRANSLATE = ['data-content', 'aria-label', 'title', 'placeholder'];
  const ATTR_SELECTOR = '[data-content], [aria-label], [title], [placeholder]';

  // 這些區塊內的文字節點（屬於使用者內容：檔名、commit 訊息、倉庫描述、README、程式碼…）一律跳過。
  const SKIP_CONTEXT_SELECTOR = [
    // 檔案列表（新版 React UI）
    '.react-directory-filename-column',
    '.react-directory-commit-message',
    '[aria-labelledby="folders-and-files"] [role="rowheader"]',
    // 最新 commit 列
    '[data-testid="latest-commit-details"]',
    '[data-testid="latest-commit"]',
    // 任何指向檔案／資料夾／commit／raw 的連結（含裡頭包的 <strong> 等）
    'a[href*="/blob/"]',
    'a[href*="/tree/"]',
    'a[href*="/commit/"]',
    'a[href*="/raw/"]',
    'a[href*="/releases/tag/"]',
    // 倉庫描述（About 區塊的敘述段落）
    '[data-testid="repository-description"]',
    '[itemprop="about"]',
    '.BorderGrid-cell > p',
    '.f4.my-3',
    // Topics 標籤
    'a.topic-tag',
    '.topic-tag',
    '.topic-tag-link',
    // 使用者／組織連結（含 hovercard）— 避免翻到使用者名稱
    'a[data-hovercard-type="user"]',
    'a[data-hovercard-type="organization"]',
    'a[data-hovercard-url*="/users/"]',
    'a[data-hovercard-url*="/orgs/"]',
    'a[data-hovercard-url*="/hovercards"]',
    // 搜尋框 / 過濾器（含語法高亮 token）
    '[role="searchbox"]',
    '[role="combobox"]',
    'form[role="search"]',
    '.subnav-search-input',
    '.subnav-search-context',
    'input[name="q"] ~ *',
    '.pl-c1', '.pl-s', '.pl-en', '.pl-k', '.pl-v', '.pl-smi', '.pl-s1',
    // Labels（使用者自定義 label 顏色塊）
    'a.IssueLabel',
    '.IssueLabel',
    '.Label',
    // 倉庫完整名 org/repo 連結
    'a[data-octo-click="hovercard-link-click"]',
    // README / 渲染後的 markdown
    '.markdown-body',
    'article.markdown-body',
    // 檔案內容、程式碼檢視
    '.blob-code-inner',
    '.highlight',
    '.react-code-lines',
    '.react-blob-view-header-sticky',
    // Issue / PR 標題與內文
    '.markdown-title',
    '.js-issue-title',
    '.markdown-body .comment-body',
  ].join(',');

  // 預編譯一次：長詞優先、忽略大小寫
  const WORD_BOUNDARY_REGEX = (() => {
    const sorted = [...TRANSLATION_MAP.keys()]
      .sort((a, b) => b.length - a.length)
      .map(s => s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'));
    return new RegExp(`\\b(${sorted.join('|')})\\b`, 'gi');
  })();

  // 給 regex 匹配結果做大小寫不敏感查表
  const LOWER_MAP = new Map(
    [...TRANSLATION_MAP.entries()].map(([k, v]) => [k.toLowerCase(), v])
  );

  // 把 62.8k → 6.3 萬、1.2M → 120 萬、999 以下千分號化
  function formatAbbrev(_m, num, unit) {
    const mul = unit.toLowerCase() === 'm' ? 1_000_000 : 1_000;
    const val = Math.round(parseFloat(num) * mul);
    if (val >= 10000) {
      const wan = val / 10000;
      const s = wan >= 100 ? Math.round(wan).toString() : wan.toFixed(1).replace(/\.0$/, '');
      return `${s} 萬`;
    }
    return val.toLocaleString('en-US');
  }

  const ABBREV_REGEX = /\b(\d+(?:\.\d+)?)([kKmM])\b/g;

  function replaceText(text) {
    if (!text) return text;
    let out = text;
    if (/[A-Za-z]/.test(out)) {
      // 先處理 "X units ago" 避免被詞庫部分吃掉
      out = out.replace(TIME_AGO_REGEX, (_m, n, u) => `${n} ${TIME_UNITS[u.toLowerCase()]}前`);
      out = out.replace(TIME_AGO_ARTICLE_REGEX, (_m, _a, u) => `1 ${TIME_UNITS[u.toLowerCase()]}前`);
      out = out.replace(WORD_BOUNDARY_REGEX, (m) => LOWER_MAP.get(m.toLowerCase()) ?? m);
    }
    if (ABBREV_REGEX.test(out)) {
      ABBREV_REGEX.lastIndex = 0;
      out = out.replace(ABBREV_REGEX, formatAbbrev);
    }
    return out;
  }

  function shouldSkipTextAncestor(el) {
    if (!el) return false;
    if (el.closest?.(SKIP_CONTEXT_SELECTOR)) return true;
    while (el && el.nodeType === Node.ELEMENT_NODE) {
      if (SKIP_TAGS.has(el.nodeName)) return true;
      if (el.isContentEditable) return true;
      if (el.getAttribute?.('role') === 'textbox') return true;
      el = el.parentElement;
    }
    return false;
  }

  function translateAttributes(el) {
    if (!(el instanceof Element)) return;
    for (const attr of ATTRIBUTES_TO_TRANSLATE) {
      const val = el.getAttribute?.(attr);
      if (!val) continue;
      const replaced = replaceText(val);
      if (replaced !== val) el.setAttribute(attr, replaced);
    }
  }

  function translateTextNode(node) {
    const original = node.nodeValue;
    if (!original || !/\S/.test(original)) return;
    if (shouldSkipTextAncestor(node.parentElement)) return;
    const replaced = replaceText(original);
    if (replaced !== original) node.nodeValue = replaced;
  }

  function translateTree(root) {
    if (!root) return;
    // 屬性：root 自己 + 所有子孫
    if (root instanceof Element && root.matches?.(ATTR_SELECTOR)) translateAttributes(root);
    root.querySelectorAll?.(ATTR_SELECTOR).forEach(translateAttributes);

    // 文字節點：用 TreeWalker 走全部
    const scanRoot = root.nodeType === Node.DOCUMENT_NODE ? root.body : root;
    if (!scanRoot) return;
    const walker = document.createTreeWalker(scanRoot, NodeFilter.SHOW_TEXT, {
      acceptNode: (n) => {
        if (!n.nodeValue || !/\S/.test(n.nodeValue)) return NodeFilter.FILTER_REJECT;
        if (shouldSkipTextAncestor(n.parentElement)) return NodeFilter.FILTER_REJECT;
        return NodeFilter.FILTER_ACCEPT;
      },
    });
    const nodes = [];
    let n;
    while ((n = walker.nextNode())) nodes.push(n);
    for (const node of nodes) translateTextNode(node);
  }

  // debounce：短時間內多次變更只翻一次
  function debounce(fn, wait) {
    let timer = 0;
    return () => {
      clearTimeout(timer);
      timer = setTimeout(fn, wait);
    };
  }

  function init() {
    translateTree(document.body);

    const scheduleTranslate = debounce(() => translateTree(document.body), 150);

    const observer = new MutationObserver((mutations) => {
      for (const m of mutations) {
        if (m.type === 'attributes' && m.target instanceof Element) {
          translateAttributes(m.target);
        } else if (m.type === 'childList') {
          m.addedNodes.forEach((n) => {
            if (n.nodeType === Node.ELEMENT_NODE) translateTree(n);
            else if (n.nodeType === Node.TEXT_NODE) translateTextNode(n);
          });
        }
      }
      // 保險起見再安排一次全域掃描（SPA 會在微任務後才補資料）
      scheduleTranslate();
    });

    observer.observe(document.body, {
      subtree: true,
      childList: true,
      attributes: true,
      attributeFilter: ATTRIBUTES_TO_TRANSLATE,
    });

    // SPA 路由切換後重新掃描
    const hookHistory = (type) => {
      const orig = history[type];
      history[type] = function () {
        const ret = orig.apply(this, arguments);
        scheduleTranslate();
        return ret;
      };
    };
    hookHistory('pushState');
    hookHistory('replaceState');
    window.addEventListener('popstate', scheduleTranslate);
    document.addEventListener('turbo:load', scheduleTranslate);
    document.addEventListener('turbo:render', scheduleTranslate);
  }

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', init, { once: true });
  } else {
    init();
  }
})();