// ==UserScript==
// @name         学科网自动下载 · 猫爪脚本
// @name:zh-CN   学科网自动下载 · 猫爪脚本
// @namespace    https://github.com/qoderwork/zxxk-autodownload
// @version      1.2.0
// @description  在学科网 / AI职教（*.xkw.com、*.zxxk.com）的打包页、资源篮、资源详情页、列表页采集资料链接。按“本课件/同专辑/推荐/热门/打包/资源篮/整包”分类，本课件优先默认勾选，打包/资源篮/整包整组默认勾选，推荐/热门/同专辑类默认不选。批量提交到下载服务，自动下载文件或标记“已发送到邮箱”；额度触顶横幅提示与自动暂停；文件名冲突自动加资料ID；支持采集所属专辑整包。
// @author       QoderWork
// @match        *://*.xkw.com/*
// @match        *://*.zxxk.com/*
// @match        *://xkw.com/*
// @match        *://zxxk.com/*
// @run-at       document-idle
// @noframes
// @grant        GM_xmlhttpRequest
// @grant        GM_setValue
// @grant        GM_getValue
// @grant        GM_addStyle
// @connect      *
// @license      MIT
// ==/UserScript==

(function () {
  "use strict";

  /* ============ 存储与默认配置 ============ */
  var PREFIX = "zxxk_dl_";
  function sget(k, def) {
    try {
      var v = GM_getValue(PREFIX + k);
      return v === undefined ? def : v;
    } catch (e) {
      return def;
    }
  }
  function sset(k, v) {
    try {
      GM_setValue(PREFIX + k, v);
    } catch (e) {}
  }

  var DEFAULTS = {
    server: "http://8.136.213.77:8080/SPM",
    username: "",
    password: "",
    email: "",
    delay: 4,
    autoDownload: true,
    uniqueFilename: true // 同名文件自动追加资料ID避免覆盖
  };
  var CFG = {
    server: sget("server", DEFAULTS.server).replace(/\/+$/, ""),
    username: sget("username", DEFAULTS.username),
    password: sget("password", DEFAULTS.password),
    email: sget("email", DEFAULTS.email),
    delay: parseFloat(sget("delay", DEFAULTS.delay)) || DEFAULTS.delay,
    autoDownload: sget("autoDownload", DEFAULTS.autoDownload) !== false,
    uniqueFilename: sget("uniqueFilename", DEFAULTS.uniqueFilename) !== false
  };

  /* ============ 下载服务响应码 → 文案 ============ */
  var CODE_MSG = {
    "111": "账号或者密码输入错误",
    "222": "当天下载份数达到上限，请明天再试",
    "555": "本周下载份数达到上限，请下周一再试",
    "666": "当前材料为第三方，无权下载",
    "777": "本周剩余份数不足以下载本书",
    "888": "网址输入错误 / 无法解析",
    "1010": "出现异常，请刷新重试",
    "1020": "邮箱输入错误",
    "1030": "多个网址请分批次提交，请勿一次性提交",
    "1040": "当前账号未激活，请联系客服",
    "1050": "份数已全部用完，请重新续费",
    "1060": "获取下载记录异常，请重试",
    "1070": "当前账号已到期，请重新续费",
    "1080": "剩余份数不足以下载当前材料",
    "1090": "该网址已提交过，请勿重复提交"
  };
  // 额度/份数相关：命中即在顶部横幅提示
  var LIMIT_CODES = { "222": 1, "555": 1, "777": 1, "1050": 1, "1070": 1, "1080": 1 };
  // 硬上限/账号状态：命中则自动暂停整个队列
  var HARD_STOP_CODES = { "222": 1, "555": 1, "1040": 1, "1050": 1, "1070": 1 };

  /* ============ 类别定义 ============ */
  var CATS = {
    self:       { label: "本课件",   color: "#c0392b", checked: true },
    same_album: { label: "同专辑",   color: "#1a56db", checked: false },
    recommend:  { label: "推荐",     color: "#7a5cff", checked: false },
    hot:        { label: "热门",     color: "#b26a00", checked: false },
    pack:       { label: "打包资料", color: "#1d8348", checked: true  },
    cart:       { label: "资源篮",   color: "#0d7a6f", checked: true  },
    album:      { label: "整包",     color: "#0a6aa1", checked: true  },
    list:       { label: "页面资源", color: "#555",    checked: false }
  };
  var CAT_ORDER = ["self", "same_album", "album", "pack", "cart", "recommend", "hot", "list"];

  /* ============ 队列 ============ */
  // item: { url, id, title, cat, status, link, msg, checked }
  var queue = sget("queue", []);
  try {
    if (typeof queue === "string") queue = JSON.parse(queue);
  } catch (e) {
    queue = [];
  }
  if (!Array.isArray(queue)) queue = [];
  var collapsed = sget("collapsed", {});
  try {
    if (typeof collapsed === "string") collapsed = JSON.parse(collapsed);
  } catch (e) {
    collapsed = {};
  }
  if (!collapsed || typeof collapsed !== "object") collapsed = {};

  var running = false;
  var stopFlag = false;
  var usedNames = {}; // 每次 processQueue 重置

  /* ============ 通用工具 ============ */
  function esc(s) {
    return String(s == null ? "" : s).replace(
      /[&<>"']/g,
      function (c) {
        return { "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" }[c];
      }
    );
  }
  function parseResp(text) {
    var d = (text || "").trim();
    var i = d.indexOf(":");
    if (i < 0) return { code: d, rest: "" };
    return { code: d.substring(0, i), rest: d.substring(i + 1) };
  }
  function splitRest(rest) {
    var i = rest.indexOf(":");
    if (i < 0) return { name: rest.trim(), payload: "" };
    return { name: rest.substring(0, i).trim(), payload: rest.substring(i + 1).trim() };
  }
  function safeName(s, fallback) {
    var n = (s || "").trim().replace(/[\\/:*?"<>|\r\n]+/g, "_").replace(/\s+/g, " ");
    return n || fallback || "zxxk-file";
  }
  function docIdFromUrl(url) {
    var m = /\/doc\/(\d+)\.html?/i.exec(url || "");
    return m ? m[1] : "";
  }
  function uniqueFilename(name, itemId) {
    var full = (name || "zxxk-file").trim();
    if (!CFG.uniqueFilename) return full;
    if (!usedNames[full.toLowerCase()]) {
      usedNames[full.toLowerCase()] = 1;
      return full;
    }
    var m = /^(.*?)(\.[^.]*)$/.exec(full) || [null, full, ""];
    var base = m[1], ext = m[2] || "";
    var id = itemId || "";
    var attempts = [
      id ? base + "_" + id + ext : null,
      id ? base + "_" + id + "_2" + ext : base + "_2" + ext,
      id ? base + "_" + id + "_3" + ext : base + "_3" + ext,
      base + "_" + Date.now() + ext
    ];
    for (var i = 0; i < attempts.length; i++) {
      var cand = attempts[i];
      if (cand && !usedNames[cand.toLowerCase()]) {
        usedNames[cand.toLowerCase()] = 1;
        return cand;
      }
    }
    return full;
  }
  function log(msg) {
    var el = document.getElementById("zxxk-log");
    if (!el) return;
    var t = new Date().toLocaleTimeString("zh-CN", { hour12: false });
    var line = document.createElement("div");
    line.className = "zxxk-log-line";
    line.textContent = "[" + t + "] " + msg;
    el.appendChild(line);
    while (el.childNodes.length > 400) el.removeChild(el.firstChild);
    el.scrollTop = el.scrollHeight;
  }

  /* ============ 顶部横幅（方案 A：额度触顶被动提示） ============ */
  function showBanner(text, tone) {
    var box = document.getElementById("zxxk-banner");
    if (!box) return;
    var txt = document.getElementById("zxxk-banner-text");
    if (txt) txt.textContent = text;
    box.className = "zxxk-banner show " + (tone || "warn");
    box.style.display = "block";
  }
  function hideBanner() {
    var el = document.getElementById("zxxk-banner");
    if (el) {
      el.style.display = "none";
    }
  }

  /* ============ GM_xmlhttpRequest 封装 ============ */
  function gmPost(url, body) {
    return new Promise(function (resolve, reject) {
      GM_xmlhttpRequest({
        method: "POST",
        url: url,
        headers: { "Content-Type": "application/x-www-form-urlencoded; charset=UTF-8" },
        data: body,
        timeout: 120000,
        onload: function (r) { resolve(r.responseText || ""); },
        onerror: function () { reject(new Error("网络请求失败")); },
        ontimeout: function () { reject(new Error("请求超时")); }
      });
    });
  }
  function gmGetText(url) {
    return new Promise(function (resolve, reject) {
      GM_xmlhttpRequest({
        method: "GET",
        url: url,
        headers: { Referer: location.href },
        timeout: 60000,
        onload: function (r) { resolve(r.responseText || ""); },
        onerror: function () { reject(new Error("拉取失败")); },
        ontimeout: function () { reject(new Error("拉取超时")); }
      });
    });
  }
  function gmGetBlob(url, extraHeaders) {
    return new Promise(function (resolve, reject) {
      GM_xmlhttpRequest({
        method: "GET",
        url: url,
        responseType: "arraybuffer",
        headers: Object.assign({ Referer: location.href }, extraHeaders || {}),
        timeout: 300000,
        onload: function (r) { resolve(r); },
        onerror: function () { reject(new Error("文件下载失败")); },
        ontimeout: function () { reject(new Error("文件下载超时")); }
      });
    });
  }
  function filenameFromHeaders(headers) {
    if (!headers) return "";
    var m = /filename\*?=\s*(?:UTF-8'')?["']?([^"';\n]+)["']?/i.exec(headers);
    if (m) {
      try { return decodeURIComponent(m[1].trim()); } catch (e) { return m[1].trim(); }
    }
    return "";
  }
  function saveBlob(arrayBuffer, filename) {
    var blob = new Blob([arrayBuffer]);
    var objUrl = URL.createObjectURL(blob);
    var a = document.createElement("a");
    a.href = objUrl;
    a.download = filename || "zxxk-" + Date.now();
    document.body.appendChild(a);
    a.click();
    setTimeout(function () {
      document.body.removeChild(a);
      URL.revokeObjectURL(objUrl);
    }, 2000);
  }
  function downloadDirect(fileUrl, title, itemId) {
    return gmGetBlob(fileUrl).then(function (r) {
      var raw = filenameFromHeaders(r.responseHeaders) || safeName(title, "zxxk-" + Date.now());
      var name = uniqueFilename(raw, itemId);
      saveBlob(r.response, name);
      return name;
    });
  }
  function downloadJiaofu(path, name, itemId) {
    var url = CFG.server + "/DownloadJiaofu";
    return new Promise(function (resolve, reject) {
      GM_xmlhttpRequest({
        method: "POST",
        url: url,
        headers: { "Content-Type": "application/x-www-form-urlencoded; charset=UTF-8" },
        data: "path=" + encodeURIComponent(encodeURI(path)),
        responseType: "arraybuffer",
        timeout: 300000,
        onload: function (r) {
          var guessName = filenameFromHeaders(r.responseHeaders) ||
            name ||
            (function () {
              var b = path.lastIndexOf("\\");
              return b >= 0 ? path.substring(b + 1) : path;
            })();
          var fname = uniqueFilename(guessName, itemId);
          saveBlob(r.response, fname);
          resolve(fname);
        },
        onerror: function () { reject(new Error("教材下载失败")); },
        ontimeout: function () { reject(new Error("教材下载超时")); }
      });
    });
  }

  /* ============ 单条提交 ============ */
  function submitOne(item) {
    var body =
      "username=" + CFG.username +
      "&password=" + CFG.password +
      "&zxxkurl=" + item.url +
      "&usermail=" + CFG.email;

    return gmPost(CFG.server + "/zxxkdown", body).then(function (text) {
      var p = parseResp(text);
      var code = p.code, rest = p.rest;

      if (code === "444" || code === "4443") {
        var s = splitRest(rest);
        if (/^\/\//.test(s.payload)) s = { name: "", payload: rest };
        item.link = s.payload;
        if (CFG.autoDownload && s.payload) {
          return downloadDirect(s.payload, s.name || item.title, item.id)
            .then(function (fname) { item.status = "已下载"; item.msg = fname; })
            .catch(function (err) {
              item.status = "下载失败";
              item.msg = (err && err.message) || "未知错误";
            });
        } else {
          item.status = "已解析";
          item.msg = "已生成直链，点击“打开”下载";
        }
        return;
      }

      if (code === "4442") {
        var s2 = splitRest(rest);
        if (CFG.autoDownload && s2.payload) {
          return downloadJiaofu(s2.payload, s2.name, item.id)
            .then(function (fname) { item.status = "已下载"; item.msg = fname; })
            .catch(function (err) {
              item.status = "下载失败";
              item.msg = (err && err.message) || "未知错误";
            });
        } else {
          item.status = "已解析";
          item.msg = "教材待下载：" + s2.payload;
        }
        return;
      }

      if (code === "333" || code === "9333") {
        var s3 = splitRest(rest);
        item.status = "已发邮箱";
        item.msg = "材料将发送到邮箱，请 10 分钟后查收" + (s3.name ? "（" + s3.name + "）" : "");
        return;
      }

      // 其它为错误码
      item.status = "失败";
      var friendly = CODE_MSG[code] || rest || ("未知响应：" + (text || "").slice(0, 60));
      item.msg = friendly;

      if (LIMIT_CODES[code]) {
        var extra = (rest && rest !== friendly) ? " · " + rest : "";
        var tone = (code === "1040" || code === "1050" || code === "1070") ? "fatal" : "warn";
        showBanner("⚠ " + friendly + extra, tone);
      }
      if (HARD_STOP_CODES[code]) {
        stopFlag = true;
        log("命中额度/账号硬上限（码 " + code + "），队列自动暂停。");
      }
      return;
    });
  }

  /* ============ 队列批处理 ============ */
  function processQueue() {
    if (running) return;
    var todo = queue.filter(function (it) {
      return it.checked !== false && (it.status === "待下载" || it.status === "重试");
    });
    if (!todo.length) {
      log("没有待下载的条目（先“采集”或勾选条目再点“开始下载”）。");
      return;
    }
    if (!CFG.username || !CFG.password) {
      log("请先在“配置”里填写账号与密码。");
      toggleConfig(true);
      return;
    }
    running = true;
    stopFlag = false;
    usedNames = {};
    hideBanner();
    setRunningUI(true);
    log("开始下载，共 " + todo.length + " 条，间隔 " + CFG.delay + " 秒。");

    var chain = Promise.resolve();
    todo.forEach(function (item) {
      chain = chain.then(function () {
        if (stopFlag) return;
        item.status = "解析中";
        item.msg = "";
        renderList();
        return submitOne(item)
          .catch(function (err) {
            item.status = "失败";
            item.msg = (err && err.message) || "请求失败";
          })
          .then(function () {
            log(item.url + " → " + item.status + (item.msg ? "：" + item.msg : ""));
            renderList();
            if (!stopFlag) return sleep(CFG.delay * 1000);
          });
      });
    });
    chain.then(function () {
      running = false;
      setRunningUI(false);
      if (stopFlag) log("队列已停止（命中额度/账号硬上限或你手动停止）。");
      else log("全部处理完成。");
      updateProgress();
    });
  }
  function sleep(ms) { return new Promise(function (r) { setTimeout(r, ms); }); }

  /* ============ 页面类型与专辑识别 ============ */
  function detectPageKind() {
    var p = location.pathname || "";
    if (/\/doc\/\d+\.html?/i.test(p)) return "doc";
    if (/\/docpack\/\d+\.html?/i.test(p)) return "docpack";
    if (/\/cart(\?|$|\/)/i.test(p)) return "cart";
    return "other";
  }
  function findAlbumUrl() {
    var scope = document.querySelector(".album-info-header") || document;
    var anchors = scope.querySelectorAll("a[href]");
    for (var i = 0; i < anchors.length; i++) {
      var h = anchors[i].href || "";
      if (/\/docpack\/\d+/i.test(h) || /\/zhuanti\/\d+/i.test(h) || /\/album\/\d+/i.test(h) || /\/special\/\d+/i.test(h)) return h;
    }
    var all = document.querySelectorAll('a[href*="/docpack/"], a[href*="/zhuanti/"], a[href*="/album/"], a[href*="/special/"]');
    if (all.length) return all[0].href;
    return "";
  }
  function findAlbumTotal() {
    var el = document.querySelector(".album-info-header");
    if (!el) return 0;
    var m = /(\d+)\s*份/.exec(el.textContent || "");
    return m ? parseInt(m[1], 10) : 0;
  }

  /* ============ 采集：把锚点归入某个类别 ============ */
  function addItem(byId, url, title, cat) {
    var key = (url || "").split("#")[0];
    if (byId[key]) return false;
    var id = docIdFromUrl(key);
    byId[key] = {
      url: key,
      id: id,
      title: (title || "资料 " + (id || "")).slice(0, 80),
      cat: cat,
      status: "待下载",
      link: "",
      msg: "",
      checked: CATS[cat] ? CATS[cat].checked : false
    };
    return true;
  }
  function addHrefToMap(href, title, byId, cat, baseUrl) {
    var m = /\/doc\/(\d+)\.html?/i.exec(href || "");
    if (!m) return;
    var abs = href;
    if (!/^https?:/i.test(abs)) {
      try { abs = new URL(abs, baseUrl || location.href).href; } catch (e) { return; }
    }
    addItem(byId, abs.split("#")[0], (title || "").trim() || ("资料 " + m[1]), cat);
  }
  // 从 DOM（document 或解析出的 HTML doc）扫描，填充 byId
  function scanAnchors(container, byId, pageKind) {
    var fallbackCat =
      pageKind === "docpack" ? "pack" :
      pageKind === "cart" ? "cart" :
      pageKind === "doc" ? "list" : "list";

    function eachAnchor(sel, cat) {
      var nodes = container.querySelectorAll ? container.querySelectorAll(sel) : [];
      Array.prototype.forEach.call(nodes, function (a) {
        var img = a.querySelector && a.querySelector("img");
        var title =
          (a.textContent || "").trim() ||
          (a.getAttribute && (a.getAttribute("title") || "")) ||
          (img && img.alt) || "";
        addHrefToMap(a.href || a.getAttribute("href"), title, byId, cat);
      });
    }
    // 详情页 / 打包页都可能出现的语义区块
    var zones = [
      { cat: "same_album", sel: '.document-from-same-album a[href*="/doc/"]' },
      { cat: "recommend",  sel: '.recommend-document a[href*="/doc/"]' },
      { cat: "hot",        sel: '.hot-document a[href*="/doc/"]' }
    ];
    zones.forEach(function (z) { eachAnchor(z.sel, z.cat); });
    // 兜底：尚未归类的 /doc/ 归入页面性质对应类别
    eachAnchor('a[href*="/doc/"]', fallbackCat);
  }

  function collectLinks() {
    var byId = {};
    queue.forEach(function (it) { byId[it.url] = it; }); // 已存在的保持不动

    var snapshot = {}; // 本次采集结果（去重后）
    scanAnchors(document, snapshot, detectPageKind());

    // 本课件（详情页）
    if (detectPageKind() === "doc") {
      var idm = /\/doc\/(\d+)\.html?/i.exec(location.pathname);
      if (idm) {
        var selfUrl = location.origin + location.pathname;
        var selfTitle = (document.title || "本课件")
          .replace(/\s*[-|·]\s*(AI职教|学科网|zxxk).*$/i, "").trim() || "本课件";
        addItem(snapshot, selfUrl, selfTitle, "self");
      }
    }

    var added = 0;
    var perCat = {};
    Object.keys(snapshot).forEach(function (k) {
      if (!byId[k]) {
        queue.push(snapshot[k]);
        byId[k] = snapshot[k];
        added++;
        var c = snapshot[k].cat;
        perCat[c] = (perCat[c] || 0) + 1;
      }
    });
    sset("queue", JSON.stringify(queue));
    renderList();
    if (added === 0) {
      log("当前页面未发现可采集的新链接。若为懒加载页，请滚动加载后再采集，或点“采集整包”。");
    } else {
      var parts = CAT_ORDER.filter(function (c) { return perCat[c]; })
        .map(function (c) { return CATS[c].label + " " + perCat[c]; });
      log("采集新增 " + added + " 条：" + parts.join("，") + "。队列共 " + queue.length + " 条。");
    }
  }

  /* ============ 采集整包（所属专辑全部） ============ */
  function collectAlbumAll() {
    var pageKind = detectPageKind();
    var targetUrl = pageKind === "docpack" ? location.href : findAlbumUrl();
    if (!targetUrl) {
      log("未在页面找到“所属专辑/打包”链接，无法采集整包。");
      return;
    }
    log("开始拉取整包：" + targetUrl);
    gmGetText(targetUrl).then(function (html) {
      var doc = new DOMParser().parseFromString(html, "text/html");
      var byId = {};
      queue.forEach(function (it) { byId[it.url] = it; });
      var snapshot = {};
      // 整包页里的 /doc/ 统一归为 album（避免误标推荐/热门）
      var anchors = doc.querySelectorAll ? doc.querySelectorAll('a[href*="/doc/"]') : [];
      Array.prototype.forEach.call(anchors, function (a) {
        var img = a.querySelector && a.querySelector("img");
        var title =
          (a.textContent || "").trim() ||
          (a.getAttribute && (a.getAttribute("title") || "")) ||
          (img && img.alt) || "";
        addHrefToMap(a.getAttribute("href"), title, snapshot, "album", targetUrl);
      });
      var added = 0;
      Object.keys(snapshot).forEach(function (k) {
        if (!byId[k]) { queue.push(snapshot[k]); byId[k] = snapshot[k]; added++; }
      });
      sset("queue", JSON.stringify(queue));
      renderList();
      log("整包采集完成，新增 " + added + " 条，队列共 " + queue.length + " 条。");
    }).catch(function (err) {
      log("整包拉取失败：" + ((err && err.message) || err));
    });
  }

  /* ============ UI ============ */
  function buildUI() {
    GM_addStyle(
      [
        "#zxxk-fab{position:fixed;right:18px;bottom:18px;z-index:2147483646;width:52px;height:52px;border-radius:50%;",
        "background:linear-gradient(135deg,#ff5f6d,#ffc371);color:#fff;font-size:22px;line-height:52px;text-align:center;",
        "cursor:pointer;box-shadow:0 6px 18px rgba(0,0,0,.28);user-select:none;font-family:-apple-system,Segoe UI,Microsoft YaHei,sans-serif;}",
        "#zxxk-fab:hover{transform:translateY(-2px);}",
        "#zxxk-panel{position:fixed;right:18px;bottom:80px;z-index:2147483646;width:460px;max-height:80vh;display:none;",
        "flex-direction:column;background:#fff;color:#222;border-radius:12px;overflow:hidden;font-size:13px;",
        "box-shadow:0 12px 40px rgba(0,0,0,.28);font-family:-apple-system,Segoe UI,Microsoft YaHei,sans-serif;border:1px solid #eee;}",
        "#zxxk-panel.open{display:flex;}",
        ".zxxk-hd{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;background:#2b3a55;color:#fff;}",
        ".zxxk-hd b{font-size:14px;}",
        ".zxxk-hd .zxxk-hd-btns span{margin-left:12px;cursor:pointer;opacity:.9;}",
        ".zxxk-body{overflow:auto;padding:10px 12px;}",
        ".zxxk-banner{display:none;padding:8px 10px;border-radius:8px;font-size:12px;margin-bottom:8px;line-height:1.5;}",
        ".zxxk-banner.warn{background:#fff4e5;color:#8a4b00;border:1px solid #ffd9a8;}",
        ".zxxk-banner.fatal{background:#fdecea;color:#a02118;border:1px solid #f5b5ae;}",
        ".zxxk-banner .close{float:right;cursor:pointer;opacity:.6;margin-left:6px;}",
        ".zxxk-cfg{display:none;background:#f6f8fb;border:1px solid #e6ebf2;border-radius:8px;padding:10px;margin-bottom:10px;}",
        ".zxxk-cfg.open{display:block;}",
        ".zxxk-row{display:flex;align-items:center;margin:6px 0;gap:8px;}",
        ".zxxk-row label{width:64px;color:#555;flex:none;}",
        ".zxxk-row input[type=text],.zxxk-row input[type=password]{flex:1;padding:6px 8px;border:1px solid #d4dbe6;border-radius:6px;box-sizing:border-box;font-size:13px;}",
        ".zxxk-row input[type=number]{width:80px;padding:6px;border:1px solid #d4dbe6;border-radius:6px;}",
        ".zxxk-inline{display:flex;align-items:center;gap:6px;color:#555;}",
        ".zxxk-tools{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:8px;}",
        ".zxxk-list{border:1px solid #eee;border-radius:8px;max-height:340px;overflow:auto;}",
        ".zxxk-group{border-bottom:1px solid #f0f0f0;}",
        ".zxxk-group:last-child{border-bottom:none;}",
        ".zxxk-group-hd{display:flex;align-items:center;gap:8px;padding:7px 10px;background:#f7f9fc;position:sticky;top:0;z-index:1;}",
        ".zxxk-group-hd .caret{width:12px;display:inline-block;color:#889;cursor:pointer;}",
        ".zxxk-group-hd .dot{width:8px;height:8px;border-radius:50%;display:inline-block;}",
        ".zxxk-group-hd .gname{font-weight:600;color:#334;}",
        ".zxxk-group-hd .gcount{color:#778;font-size:12px;}",
        ".zxxk-group-hd .gselall{margin-left:auto;color:#1a73e8;font-size:12px;cursor:pointer;}",
        ".zxxk-group-bd.hide{display:none;}",
        ".zxxk-item{display:flex;align-items:center;gap:8px;padding:7px 12px 7px 24px;border-bottom:1px solid #f5f5f5;}",
        ".zxxk-item:last-child{border-bottom:none;}",
        ".zxxk-item.self{background:#fff8f7;}",
        ".zxxk-item .ttl{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#333;}",
        ".zxxk-item .st{flex:none;font-size:12px;padding:2px 7px;border-radius:10px;background:#eef1f5;color:#667;}",
        ".zxxk-item .st.ok{background:#e6f6ec;color:#1d8348;}",
        ".zxxk-item .st.mail{background:#fff3e0;color:#b26a00;}",
        ".zxxk-item .st.err{background:#fdecea;color:#c0392b;}",
        ".zxxk-item .st.run{background:#e8f0fe;color:#1a56db;}",
        ".zxxk-item .op{flex:none;color:#1a73e8;cursor:pointer;margin-left:4px;}",
        ".zxxk-ft{display:flex;align-items:center;gap:8px;padding:10px 12px;border-top:1px solid #eee;background:#fafbfc;}",
        "button.zxxk-btn{border:none;border-radius:6px;padding:8px 14px;font-size:13px;cursor:pointer;background:#2b3a55;color:#fff;}",
        "button.zxxk-btn.ghost{background:#eef1f5;color:#334;}",
        "button.zxxk-btn.dl{background:linear-gradient(135deg,#ff5f6d,#ff8a5f);}",
        "button.zxxk-btn.primary{background:linear-gradient(135deg,#c0392b,#e67e22);}",
        "button.zxxk-btn:disabled{opacity:.5;cursor:not-allowed;}",
        ".zxxk-log{margin-top:8px;border:1px solid #eee;border-radius:8px;background:#0f1720;color:#b9c6d6;font-size:11px;",
        "line-height:1.5;padding:8px;height:110px;overflow:auto;font-family:Menlo,Consolas,monospace;}",
        ".zxxk-prog{margin-left:auto;color:#666;font-size:12px;}",
        ".zxxk-empty{padding:18px;text-align:center;color:#aaa;}",
        ".zxxk-self-bar{display:flex;gap:6px;align-items:center;margin-bottom:8px;padding:8px 10px;",
        "background:linear-gradient(90deg,#fff5f5,#fff9f0);border:1px solid #ffe1d8;border-radius:8px;}",
        ".zxxk-self-bar .badge{background:#c0392b;color:#fff;border-radius:4px;padding:2px 6px;font-size:11px;flex:none;}",
        ".zxxk-self-bar .t{flex:1;color:#5b2a26;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}",
        ".zxxk-self-bar button{padding:6px 10px;font-size:12px;}"
      ].join("")
    );

    var fab = document.createElement("div");
    fab.id = "zxxk-fab";
    fab.title = "学科网自动下载";
    fab.textContent = "🐾";
    document.body.appendChild(fab);

    var panel = document.createElement("div");
    panel.id = "zxxk-panel";
    panel.innerHTML =
      '<div class="zxxk-hd">' +
      '<b>学科网自动下载 <span style="font-weight:normal;opacity:.7;font-size:11px;">v1.2.0</span></b>' +
      '<div class="zxxk-hd-btns"><span id="zxxk-btn-cfg" title="配置">⚙</span><span id="zxxk-btn-close" title="收起">✕</span></div>' +
      "</div>" +
      '<div class="zxxk-body">' +
      '<div class="zxxk-banner" id="zxxk-banner"><span class="close" id="zxxk-banner-x">✕</span><span id="zxxk-banner-text"></span></div>' +
      '<div class="zxxk-cfg" id="zxxk-cfg">' +
      '<div class="zxxk-row"><label>服务地址</label><input type="text" id="c-server"></div>' +
      '<div class="zxxk-row"><label>账号</label><input type="text" id="c-username"></div>' +
      '<div class="zxxk-row"><label>密码</label><input type="password" id="c-password"></div>' +
      '<div class="zxxk-row"><label>邮箱</label><input type="text" id="c-email"></div>' +
      '<div class="zxxk-row"><label>间隔(秒)</label><input type="number" id="c-delay" min="0" step="0.5">' +
      '<span class="zxxk-inline"><input type="checkbox" id="c-auto"> 自动下载</span>' +
      '<span class="zxxk-inline"><input type="checkbox" id="c-uname"> 文件名去重</span></div>' +
      '<div class="zxxk-row" style="justify-content:flex-end"><button class="zxxk-btn" id="c-save">保存配置</button></div>' +
      "</div>" +
      '<div id="zxxk-self-slot"></div>' +
      '<div class="zxxk-tools">' +
      '<button class="zxxk-btn" id="zxxk-collect">采集当前页链接</button>' +
      '<button class="zxxk-btn ghost" id="zxxk-album" style="display:none">采集整包</button>' +
      '<button class="zxxk-btn ghost" id="zxxk-all">全选</button>' +
      '<button class="zxxk-btn ghost" id="zxxk-none">全不选</button>' +
      '<button class="zxxk-btn ghost" id="zxxk-clear">清空队列</button>' +
      "</div>" +
      '<div class="zxxk-list" id="zxxk-list"></div>' +
      '<div class="zxxk-log" id="zxxk-log"></div>' +
      "</div>" +
      '<div class="zxxk-ft">' +
      '<button class="zxxk-btn dl" id="zxxk-start">开始下载</button>' +
      '<button class="zxxk-btn ghost" id="zxxk-stop" disabled>停止</button>' +
      '<span class="zxxk-prog" id="zxxk-prog"></span>' +
      "</div>";
    document.body.appendChild(panel);

    fab.onclick = function () {
      panel.classList.toggle("open");
      if (panel.classList.contains("open")) {
        renderList();
        updateProgress();
      }
    };
    document.getElementById("zxxk-btn-close").onclick = function () { panel.classList.remove("open"); };
    document.getElementById("zxxk-btn-cfg").onclick = function () { toggleConfig(); };
    document.getElementById("zxxk-banner-x").onclick = hideBanner;

    document.getElementById("zxxk-collect").onclick = collectLinks;
    document.getElementById("zxxk-album").onclick = collectAlbumAll;
    document.getElementById("zxxk-clear").onclick = function () {
      if (!queue.length) return;
      if (confirm("确定清空下载队列？")) {
        queue = [];
        sset("queue", "[]");
        renderList();
        updateProgress();
      }
    };
    document.getElementById("zxxk-all").onclick = function () {
      queue.forEach(function (i) { i.checked = true; });
      sset("queue", JSON.stringify(queue));
      renderList();
    };
    document.getElementById("zxxk-none").onclick = function () {
      queue.forEach(function (i) { i.checked = false; });
      sset("queue", JSON.stringify(queue));
      renderList();
    };
    document.getElementById("zxxk-start").onclick = processQueue;
    document.getElementById("zxxk-stop").onclick = function () {
      stopFlag = true;
      log("收到停止指令，将在当前条目完成后停止…");
    };

    // 配置表单
    document.getElementById("c-server").value = CFG.server;
    document.getElementById("c-username").value = CFG.username;
    document.getElementById("c-password").value = CFG.password;
    document.getElementById("c-email").value = CFG.email;
    document.getElementById("c-delay").value = CFG.delay;
    document.getElementById("c-auto").checked = CFG.autoDownload;
    document.getElementById("c-uname").checked = CFG.uniqueFilename;
    document.getElementById("c-save").onclick = function () {
      CFG.server = document.getElementById("c-server").value.trim().replace(/\/+$/, "") || DEFAULTS.server;
      CFG.username = document.getElementById("c-username").value.trim();
      CFG.password = document.getElementById("c-password").value;
      CFG.email = document.getElementById("c-email").value.trim();
      CFG.delay = parseFloat(document.getElementById("c-delay").value) || 0;
      CFG.autoDownload = document.getElementById("c-auto").checked;
      CFG.uniqueFilename = document.getElementById("c-uname").checked;
      sset("server", CFG.server);
      sset("username", CFG.username);
      sset("password", CFG.password);
      sset("email", CFG.email);
      sset("delay", CFG.delay);
      sset("autoDownload", CFG.autoDownload);
      sset("uniqueFilename", CFG.uniqueFilename);
      log("配置已保存。");
      toggleConfig(false);
    };

    renderList();
    updateProgress();
  }

  function toggleConfig(force) {
    var el = document.getElementById("zxxk-cfg");
    if (!el) return;
    if (force === true || (force === undefined && !el.classList.contains("open"))) el.classList.add("open");
    else if (force === false) el.classList.remove("open");
    else el.classList.toggle("open");
  }

  function ensureSelfItem() {
    var idm = /\/doc\/(\d+)\.html?/i.exec(location.pathname);
    if (!idm) return null;
    var url = location.origin + location.pathname;
    for (var i = 0; i < queue.length; i++) if (queue[i].url === url) return queue[i];
    var selfTitle = (document.title || "本课件")
      .replace(/\s*[-|·]\s*(AI职教|学科网|zxxk).*$/i, "").trim() || "本课件";
    var it = {
      url: url, id: idm[1], title: selfTitle.slice(0, 80), cat: "self",
      status: "待下载", link: "", msg: "", checked: true
    };
    queue.push(it);
    sset("queue", JSON.stringify(queue));
    return it;
  }

  function renderSelfBar() {
    var slot = document.getElementById("zxxk-self-slot");
    if (!slot) return;
    var albumBtn = document.getElementById("zxxk-album");
    var kind = detectPageKind();

    if (kind === "docpack") {
      slot.innerHTML = "";
      if (albumBtn) { albumBtn.style.display = ""; albumBtn.textContent = "采集整包（拉取完整打包）"; albumBtn.onclick = collectAlbumAll; }
      return;
    }
    if (kind !== "doc") {
      slot.innerHTML = "";
      if (albumBtn) albumBtn.style.display = "none";
      return;
    }

    // doc 详情页
    var selfItem = null;
    for (var i = 0; i < queue.length; i++) { if (queue[i].cat === "self") { selfItem = queue[i]; break; } }
    var albumUrl = findAlbumUrl();
    var total = findAlbumTotal();
    if (albumBtn) {
      albumBtn.style.display = albumUrl ? "" : "none";
      albumBtn.textContent = "采集整包" + (albumUrl ? (total ? "（" + total + "份）" : "（所属专辑）") : "");
      albumBtn.onclick = collectAlbumAll;
    }
    var title = selfItem ? selfItem.title : ((document.title || "").replace(/\s*[-|·]\s*(AI职教|学科网|zxxk).*$/i, "").trim() || "本课件");
    var url = selfItem ? selfItem.url : (location.origin + location.pathname);
    var bar =
      '<div class="zxxk-self-bar"><span class="badge">本课件</span>' +
      '<span class="t" title="' + esc(url) + '">' + esc(title) +
      (selfItem ? ' <span style="font-weight:normal;color:#888;">· ' + esc(selfItem.status || "待下载") + "</span>" : "") +
      "</span>" +
      '<button class="zxxk-btn primary" id="zxxk-self-download">下载本课件</button>';
    if (!selfItem) bar += '<button class="zxxk-btn ghost" id="zxxk-self-add">加入队列</button>';
    bar += "</div>";
    slot.innerHTML = bar;

    var dlBtn = document.getElementById("zxxk-self-download");
    if (dlBtn) dlBtn.onclick = function () {
      var item = ensureSelfItem();
      if (!item) return;
      queue.forEach(function (i) { i.checked = false; });
      item.checked = true;
      if (item.status !== "待下载" && item.status !== "重试") item.status = "待下载";
      renderList();
      processQueue();
    };
    var addBtn = document.getElementById("zxxk-self-add");
    if (addBtn) addBtn.onclick = function () { ensureSelfItem(); collectLinks(); };
  }

  function statusClass(st) {
    if (st === "已下载" || st === "已解析") return "ok";
    if (st === "已发邮箱") return "mail";
    if (st === "失败" || st === "下载失败") return "err";
    if (st === "解析中") return "run";
    return "";
  }

  function renderList() {
    var box = document.getElementById("zxxk-list");
    if (!box) return;
    if (!queue.length) {
      box.innerHTML = '<div class="zxxk-empty">队列为空，点“采集当前页链接”开始</div>';
      updateProgress();
      renderSelfBar();
      return;
    }
    var groups = {};
    queue.forEach(function (it, idx) {
      var c = it.cat || "list";
      (groups[c] = groups[c] || []).push({ it: it, idx: idx });
    });
    var html = "";
    var rendered = {};
    function groupHtml(catKey) {
      var items = groups[catKey];
      var cat = CATS[catKey] || { label: catKey, color: "#999" };
      var allChecked = items.every(function (x) { return x.it.checked !== false; });
      var isCollapsed = !!collapsed[catKey];
      var out =
        '<div class="zxxk-group" data-cat="' + catKey + '">' +
        '<div class="zxxk-group-hd">' +
        '<span class="caret" data-op="toggle" data-cat="' + catKey + '">' + (isCollapsed ? "▸" : "▾") + "</span>" +
        '<span class="dot" style="background:' + cat.color + '"></span>' +
        '<span class="gname">' + esc(cat.label) + "</span>" +
        '<span class="gcount">(' + items.length + ")</span>" +
        '<span class="gselall" data-op="gselall" data-cat="' + catKey + '">' + (allChecked ? "本组全不选" : "本组全选") + "</span>" +
        "</div>" +
        '<div class="zxxk-group-bd' + (isCollapsed ? " hide" : "") + '">';
      items.forEach(function (x) {
        var it = x.it, idx = x.idx;
        var chk = it.checked === false ? "" : "checked";
        var op = it.link
          ? '<span class="op" data-op="open" data-i="' + idx + '">打开</span>'
          : "";
        out +=
          '<div class="zxxk-item ' + (catKey === "self" ? "self" : "") + '">' +
          '<input type="checkbox" ' + chk + ' data-op="chk" data-i="' + idx + '">' +
          '<span class="ttl" title="' + esc(it.url) + '">' + esc(it.title || it.url) + "</span>" +
          '<span class="st ' + statusClass(it.status) + '">' + esc(it.status || "待下载") + "</span>" +
          op +
          "</div>";
      });
      out += "</div></div>";
      return out;
    }
    CAT_ORDER.forEach(function (c) {
      if (!groups[c]) return;
      rendered[c] = 1;
      html += groupHtml(c);
    });
    Object.keys(groups).forEach(function (c) {
      if (rendered[c]) return;
      html += groupHtml(c);
    });
    box.innerHTML = html;

    Array.prototype.forEach.call(box.querySelectorAll("[data-op]"), function (el) {
      var op = el.getAttribute("data-op");
      if (op === "chk") {
        var i = parseInt(el.getAttribute("data-i"), 10);
        el.onchange = function () {
          queue[i].checked = el.checked;
          sset("queue", JSON.stringify(queue));
          updateProgress();
        };
      } else if (op === "open") {
        var idx = parseInt(el.getAttribute("data-i"), 10);
        el.onclick = function () {
          var u = queue[idx].link;
          if (u) window.open(u, "_blank");
        };
      } else if (op === "toggle") {
        var c = el.getAttribute("data-cat");
        el.onclick = function () {
          collapsed[c] = !collapsed[c];
          sset("collapsed", JSON.stringify(collapsed));
          renderList();
        };
      } else if (op === "gselall") {
        var cat = el.getAttribute("data-cat");
        el.onclick = function () {
          var items = queue.filter(function (x) { return (x.cat || "list") === cat; });
          var allChecked = items.every(function (x) { return x.checked !== false; });
          items.forEach(function (x) { x.checked = !allChecked; });
          sset("queue", JSON.stringify(queue));
          renderList();
        };
      }
    });
    updateProgress();
    renderSelfBar();
  }

  function updateProgress() {
    var el = document.getElementById("zxxk-prog");
    if (!el) return;
    var total = queue.length;
    var checked = queue.filter(function (i) { return i.checked !== false; }).length;
    var done = queue.filter(function (i) {
      return i.status === "已下载" || i.status === "已发邮箱" || i.status === "已解析";
    }).length;
    var fail = queue.filter(function (i) {
      return i.status === "失败" || i.status === "下载失败";
    }).length;
    el.textContent = total
      ? "勾选 " + checked + " · 完成 " + done + "/" + total + (fail ? " · 失败 " + fail : "")
      : "";
  }

  function setRunningUI(on) {
    var s = document.getElementById("zxxk-start");
    var st = document.getElementById("zxxk-stop");
    if (s) s.disabled = on;
    if (st) st.disabled = !on;
  }

  /* ============ 启动 ============ */
  if (document.body) buildUI();
  else window.addEventListener("DOMContentLoaded", buildUI);
})();