// ==UserScript==
// @name         小红书复制链接净化
// @namespace    https://github.com/LeonYew-Ley/xiaohongshu-clean-share-link
// @version      1.1.0
// @description  点击「复制链接」后，剪贴板写成【标题】干净链接，去掉 token 与追踪参数
// @author       LeonYew-Ley
// @license      MIT
// @match        *://www.xiaohongshu.com/*
// @match        *://xiaohongshu.com/*
// @icon         https://www.xiaohongshu.com/favicon.ico
// @homepageURL  https://github.com/LeonYew-Ley/xiaohongshu-clean-share-link
// @supportURL   https://github.com/LeonYew-Ley/xiaohongshu-clean-share-link/issues
// @run-at       document-start
// @grant        none
// @inject-into  page
// ==/UserScript==

(() => {
  "use strict";

  const COPY_LABEL = "复制链接";
  const NOTE_ID_RE = /(?:explore|discovery\/item|item)\/([0-9a-f]{24})/i;
  const PROFILE_NOTE_RE = /\/user\/profile\/[0-9a-f]+\/([0-9a-f]{24})/i;
  const URL_IN_TEXT_RE =
    /https?:\/\/(?:www\.)?(?:xiaohongshu\.com|xhslink\.com)[^\s]+/gi;
  const SHARE_HINT_RE =
    /打开【小红书】|复制后打开|发布了一篇小红书笔记|xhsshare=|source=webshare|xsec_source=|xhslink\.com/i;

  let armedUntil = 0;
  let toastUntil = 0;

  function armCopy() {
    armedUntil = Date.now() + 2000;
  }

  function isArmed() {
    return Date.now() < armedUntil;
  }

  function getState() {
    try {
      return window.__INITIAL_STATE__ || null;
    } catch {
      return null;
    }
  }

  function unwrap(value) {
    if (value && typeof value === "object" && "value" in value) {
      return value.value;
    }
    return value;
  }

  function getNoteIdFromHref(href) {
    if (!href) return "";
    const fromExplore = href.match(NOTE_ID_RE);
    if (fromExplore) return fromExplore[1];
    const fromProfile = href.match(PROFILE_NOTE_RE);
    return fromProfile ? fromProfile[1] : "";
  }

  function getCurrentNoteId() {
    return getNoteIdFromHref(location.href);
  }

  function getNoteDetail(noteId) {
    const state = getState();
    if (!state || !noteId) return null;
    const map = unwrap(state.note?.noteDetailMap) || {};
    const entry = unwrap(map[noteId]) || {};
    return unwrap(entry.note) || null;
  }

  function firstText(selectors) {
    for (const selector of selectors) {
      const el = document.querySelector(selector);
      const text = el?.textContent?.trim();
      if (text) return text;
    }
    return "";
  }

  function stripSiteSuffix(text) {
    return (text || "")
      .replace(/\s*[-–—|]\s*小红书\s*$/, "")
      .replace(/\s*[-–—|]\s*Xiaohongshu\s*$/i, "")
      .trim();
  }

  function getNoteTitle(shareText) {
    const noteId = getCurrentNoteId();
    const note = getNoteDetail(noteId);
    const fromState = (note?.title || note?.displayTitle || note?.display_title || "").trim();
    if (fromState) return fromState;

    const fromDom = firstText([
      "#detail-title",
      ".note-content .title",
      ".interaction-container .title",
      ".note-scroller .title",
      '[class*="note-content"] [class*="title"]',
    ]);
    if (fromDom) return fromDom;

    const og = document.querySelector('meta[property="og:title"]')?.content;
    const fromOg = stripSiteSuffix(og);
    if (fromOg && fromOg !== "小红书") return fromOg;

    const fromDoc = stripSiteSuffix(document.title);
    if (fromDoc && fromDoc !== "小红书") return fromDoc;

    if (shareText) {
      const firstLine = shareText
        .split(/\r?\n/)
        .map((line) => line.trim())
        .find((line) => line && !/^https?:\/\//i.test(line) && !SHARE_HINT_RE.test(line));
      if (firstLine) return firstLine.replace(/[😀-🙏🌀-🗿]+$/u, "").trim();
    }

    return "";
  }

  function looksLikeOfficialShare(text) {
    if (!text) return false;
    return SHARE_HINT_RE.test(text);
  }

  function extractUrlFromText(text) {
    const matches = String(text || "").match(URL_IN_TEXT_RE);
    return matches ? matches[matches.length - 1].replace(/[),.;]+$/, "") : "";
  }

  function cleanNoteUrl(rawUrl, shareText) {
    const noteId =
      getNoteIdFromHref(rawUrl) ||
      getCurrentNoteId() ||
      getNoteIdFromHref(extractUrlFromText(shareText));
    if (!noteId) {
      return rawUrl ? stripQuery(rawUrl) : location.href.split("?")[0];
    }

    return `https://www.xiaohongshu.com/explore/${noteId}`;
  }

  function stripQuery(rawUrl) {
    try {
      const url = new URL(rawUrl);
      url.search = "";
      url.hash = "";
      return url.toString();
    } catch {
      return rawUrl.split("?")[0];
    }
  }

  function buildCleanText(shareText) {
    const title = getNoteTitle(shareText);
    const rawUrl = extractUrlFromText(shareText) || location.href;
    const url = cleanNoteUrl(rawUrl, shareText);
    return title ? `【${title}】${url}` : url;
  }

  function writeClipboard(text) {
    if (!text) return Promise.resolve();
    if (navigator.clipboard?.writeText) {
      return navigator.clipboard.writeText(text).catch(() => fallbackCopy(text));
    }
    return Promise.resolve(fallbackCopy(text));
  }

  function fallbackCopy(text) {
    const input = document.createElement("textarea");
    input.value = text;
    input.setAttribute("readonly", "");
    input.style.cssText = "position:fixed;top:-9999px;left:-9999px;opacity:0";
    document.body.appendChild(input);
    input.select();
    try {
      document.execCommand("copy");
    } finally {
      input.remove();
    }
  }

  function overwriteClipboard(shareText) {
    const text = buildCleanText(shareText);
    writeClipboard(text);
    [60, 180, 450].forEach((delay) => {
      setTimeout(() => writeClipboard(text), delay);
    });
    showToast("已复制标题和干净链接");
  }

  function isCopyLinkItem(node) {
    const item = node?.closest?.(".xhs-note-share-popup-action-item");
    if (!item) return false;
    return (item.textContent || "").replace(/\s+/g, "").includes(COPY_LABEL);
  }

  function hookClipboard() {
    const proto = window.Clipboard?.prototype;
    if (!proto?.writeText || proto.writeText.__xhsCleanCopy) return;

    const original = proto.writeText;
    proto.writeText = function patchedWriteText(data) {
      const text = typeof data === "string" ? data : String(data ?? "");
      if (isArmed() || looksLikeOfficialShare(text)) {
        armedUntil = 0;
        data = buildCleanText(text);
        showToast("已复制标题和干净链接");
      }
      return original.call(this, data);
    };
    proto.writeText.__xhsCleanCopy = true;
  }

  function showToast(message) {
    if (Date.now() < toastUntil) return;
    toastUntil = Date.now() + 1500;
    const old = document.getElementById("xhs-clean-copy-toast");
    old?.remove();

    const toast = document.createElement("div");
    toast.id = "xhs-clean-copy-toast";
    toast.textContent = message;
    toast.style.cssText = [
      "position:fixed",
      "left:50%",
      "bottom:24%",
      "transform:translateX(-50%)",
      "z-index:2147483647",
      "padding:10px 16px",
      "border-radius:8px",
      "background:rgba(0,0,0,.78)",
      "color:#fff",
      "font-size:14px",
      "line-height:1.4",
      "pointer-events:none",
      "box-shadow:0 6px 20px rgba(0,0,0,.25)",
    ].join(";");
    document.documentElement.appendChild(toast);
    setTimeout(() => toast.remove(), 1600);
  }

  hookClipboard();

  document.addEventListener(
    "click",
    (event) => {
      if (!isCopyLinkItem(event.target)) return;
      armCopy();
      // 站点可能异步写入剪贴板；先生成一份，再在短时间内覆盖官方带追踪文案
      overwriteClipboard("");
    },
    true
  );

  document.addEventListener(
    "copy",
    (event) => {
      if (!isArmed() && !isCopyLinkItem(event.target)) return;
      const original = event.clipboardData?.getData("text/plain") || "";
      const cleaned = buildCleanText(original);
      event.clipboardData?.setData("text/plain", cleaned);
      event.preventDefault();
      armedUntil = 0;
      showToast("已复制标题和干净链接");
    },
    true
  );
})();