// ==UserScript==
// @name         Twitter/X 视频下载助手
// @namespace    http://tampermonkey.net/
// @version      2.6.0
// @description  Twitter 视频下载
// @author       Gemini Modified
// @license      MIT
// @match        https://x.com/*
// @match        https://twitter.com/*
// @require      https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.1/jquery.min.js
// @grant        GM_download
// @downloadURL https://update.greasyfork.icu/scripts/573462/TwitterX%20%E8%A7%86%E9%A2%91%E4%B8%8B%E8%BD%BD%E5%8A%A9%E6%89%8B.user.js
// @updateURL https://update.greasyfork.icu/scripts/573462/TwitterX%20%E8%A7%86%E9%A2%91%E4%B8%8B%E8%BD%BD%E5%8A%A9%E6%89%8B.meta.js
// ==/UserScript==

(function() {
    "use strict";

    $("head").append(`
        <style>
            #Orb {
                width: 38px; height: 38px; border-radius: 50%;
                background: radial-gradient(circle, #fff 0%, #1D9BF0 28%, #1A8CD8 70%, transparent 100%);
                border: 3px solid #fff;
                box-shadow: 0 0 18px rgba(29, 155, 240, 0.8), inset 0 0 12px rgba(29, 155, 240, 0.5);
                cursor: pointer; display: flex; align-items: center; justify-content: center;
                transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
                z-index: 1000000; backdrop-filter: blur(4px);
            }
            #Orb:hover { filter: brightness(1.1); transform: scale(1.05); }
            #VideoList::-webkit-scrollbar { display: none; }
            #RefreshList {
                background: #1D9BF0; border: none; color: white; padding: 4px 12px;
                border-radius: 8px; cursor: pointer; font-size: 12px; font-weight: bold;
            }
        </style>
    `);

    $("body").append(`
        <div id='MyUrls' style='position:fixed; top:20px; right:20px; z-index:999999; display:flex; flex-direction:column; align-items:flex-end;'>
            <div id='Orb'>
                <svg viewBox="0 0 24 24" fill="none" style="width: 58%; height: 58%; filter: drop-shadow(0 0 2px rgba(255,255,255,0.8));">
                    <path d="M12 3V16M12 16L7 11M12 16L17 11" stroke="#ffffff" stroke-width="3.5" stroke-linecap="round" stroke-linejoin="round"/>
                    <path d="M5 21H19" stroke="#ffffff" stroke-width="3.5" stroke-linecap="round" stroke-linejoin="round"/>
                </svg>
            </div>
            <div id='VideoList' style='display:none; width:280px; max-height:80vh; background:rgba(255,255,255,0.98); backdrop-filter:blur(15px); border:2.5px solid #1D9BF0; padding:12px; border-radius:14px; box-shadow:0 15px 45px rgba(0,0,0,0.2); margin-top:15px; overflow-y:auto;'>
                <div style='display:flex; justify-content:space-between; align-items:center; margin-bottom:12px; border-bottom:2px solid #EFF3F4; padding-bottom:10px;'>
                    <b style="color:#0F1419; font-size:15px;">视频下载列表</b>
                    <button id='RefreshList'>刷新</button>
                </div>
                <div id="ListContent"></div>
            </div>
        </div>
    `);

    function resetSniffer() {
        $("#ListContent").empty();
        console.log("Twitter下载助手：已自动重置嗅探环境");
    }

    let lastUrl = location.href;
    new MutationObserver(() => {
        const currentUrl = location.href;
        if (currentUrl !== lastUrl) {
            lastUrl = currentUrl;
            resetSniffer(); 
        }
    }).observe(document, { subtree: true, childList: true });

    $("#Orb").click(() => $("#VideoList").fadeToggle(200));
    $("#RefreshList").click((e) => { e.stopPropagation(); resetSniffer(); });

    (function(open) {
        XMLHttpRequest.prototype.open = function() {
            this.addEventListener("load", function() {
                try {
                    if (this.responseText && (this.responseURL.includes("/TweetDetail") || this.responseURL.includes("/UserBy"))) {
                        findTwitterVideos(JSON.parse(this.responseText));
                    }
                } catch(e) {}
            });
            open.apply(this, arguments);
        };
    })(XMLHttpRequest.prototype.open);

    function findTwitterVideos(obj) {
        if (!obj || typeof obj !== 'object') return;
        if (obj.variants && Array.isArray(obj.variants)) {
            const mp4s = obj.variants.filter(v => v.content_type === 'video/mp4');
            if (mp4s.length > 0) {
                mp4s.sort((a, b) => (b.bitrate || 0) - (a.bitrate || 0));
                addToList(mp4s[0].url);
            }
        }
        for (let key in obj) findTwitterVideos(obj[key]);
    }

    function addToList(url) {
        if ($(`input[value='${url}']`).length > 0) return;
        $("#ListContent").append(`
            <div style='background:#F7F9F9; padding:12px; margin-bottom:10px; border-radius:10px; border:1px solid #CFD9DE;'>
                <input class='downUrl' value='${url}' style='width:100%; font-size:11px; margin-bottom:8px; background:transparent; border:none; color:#1D9BF0; font-weight:600;' readonly>
                <button class='SaveBtn' style='width:100%; background:#1D9BF0; color:white; border:none; padding:8px; cursor:pointer; border-radius:999px; font-weight:bold;'>下载视频</button>
            </div>
        `);
    }

    $(document).on("click", ".SaveBtn", function() {
        const url = $(this).prev(".downUrl").val();
        GM_download(url, "twitter_video_" + Date.now() + ".mp4");
    });
})();