Transfer.it Tools Enhanced

Copy links for transfer.it with custom player support. Handles single and multi-file transfers.

スクリプトをインストールするには、Tampermonkey, GreasemonkeyViolentmonkey のような拡張機能のインストールが必要です。

You will need to install an extension such as Tampermonkey to install this script.

スクリプトをインストールするには、TampermonkeyViolentmonkey のような拡張機能のインストールが必要です。

スクリプトをインストールするには、TampermonkeyUserscripts のような拡張機能のインストールが必要です。

このスクリプトをインストールするには、Tampermonkeyなどの拡張機能をインストールする必要があります。

このスクリプトをインストールするには、ユーザースクリプト管理ツールの拡張機能をインストールする必要があります。

(ユーザースクリプト管理ツールは設定済みなのでインストール!)

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このスタイルをインストールするには、Stylusなどの拡張機能をインストールする必要があります。

このスタイルをインストールするには、Stylus などの拡張機能をインストールする必要があります。

このスタイルをインストールするには、Stylus tなどの拡張機能をインストールする必要があります。

このスタイルをインストールするには、ユーザースタイル管理用の拡張機能をインストールする必要があります。

このスタイルをインストールするには、ユーザースタイル管理用の拡張機能をインストールする必要があります。

このスタイルをインストールするには、ユーザースタイル管理用の拡張機能をインストールする必要があります。

(ユーザースタイル管理ツールは設定済みなのでインストール!)

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// ==UserScript==
// @name         Transfer.it Tools Enhanced
// @namespace    https://tampermonkey.net/
// @version      1.0
// @description  Copy links for transfer.it with custom player support. Handles single and multi-file transfers.
// @author       pandamoon21
//
// @match        https://transfer.it/*
//
// @icon         https://www.google.com/s2/favicons?sz=64&domain=transfer.it
//
// @grant        GM_xmlhttpRequest
// @grant        GM_setClipboard
// @grant        GM_addStyle
// @grant        GM_addElement
// @grant        GM_setValue
// @grant        GM_getValue
// @grant        GM_registerMenuCommand
// @connect      mega.co.nz
// @connect      *.mega.co.nz
// @license      MIT
// ==/UserScript==

(function() {
    'use strict';

    // --- CONFIGURATION ---
    const PRESETS = {
        potplayer: { name: "PotPlayer", scheme: "potplayer://" },
        vlc: { name: "VLC Media Player", scheme: "vlc://" },
        mpv: { name: "MPV", scheme: "mpv://" },
        kmplayer: { name: "KMPlayer", scheme: "kmplayer://" },
        iina: { name: "IINA (Mac)", scheme: "iina://" }
    };

    const MEGA_API_BASE = 'https://bt7.api.mega.co.nz';
    const ANTILEAK_HEADER = '/cs?id=418284579&v=3&lang=en&wcv=2.155.1163&domain=transferit&bb=3&bc=1';

    // Per-file caches
    const fileMap = new Map();
    const directUrlCache = new Map();
    let transferInfoCache = null;
    let fileListPromise = null;

    // --- PLAYER MANAGEMENT ---
    function getCurrentPlayer() {
        const key = GM_getValue('selectedPlayer', 'potplayer');
        if (key === 'custom') {
            return { key: 'custom', name: "Custom Player", scheme: GM_getValue('customPlayerScheme', '') };
        }
        return PRESETS[key] ? { key, ...PRESETS[key] } : { key: 'potplayer', ...PRESETS.potplayer };
    }

    function registerMenus() {
        const current = getCurrentPlayer();
        for (const [key, player] of Object.entries(PRESETS)) {
            const label = (current.key === key ? '✅ ' : '⚪ ') + player.name;
            GM_registerMenuCommand(`Change Player: ${label}`, () => {
                GM_setValue('selectedPlayer', key);
                location.reload();
            });
        }
        const customLabel = (current.key === 'custom' ? '✅ ' : '⚪ ') + "Custom Player";
        GM_registerMenuCommand(`Change Player: ${customLabel}`, () => {
            const savedScheme = GM_getValue('customPlayerScheme', '');
            const input = prompt("Input Video Player URI Scheme:\n(example: 'potplayer://' or 'mpc-be://')", savedScheme);
            if (input !== null) {
                const cleanInput = input.trim();
                if (cleanInput) {
                    GM_setValue('customPlayerScheme', cleanInput);
                    GM_setValue('selectedPlayer', 'custom');
                    location.reload();
                } else {
                    alert("Scheme can not be empty!");
                }
            }
        });
    }
    registerMenus();

    // --- MEGA API ---
    function megaApiPost(body, extraHeaders = {}) {
        return new Promise((resolve, reject) => {
            GM_xmlhttpRequest({
                method: "POST",
                url: `${MEGA_API_BASE}/cs?`,
                headers: { "Content-Type": "text/plain;charset=UTF-8", "Accept": "*/*", "Origin": "https://transfer.it", "Referer": "https://transfer.it/", ...extraHeaders },
                data: JSON.stringify(body),
                onload: function(response) {
                    if (response.status === 200) {
                        try { resolve(JSON.parse(response.responseText)); }
                        catch (e) { reject(new Error('Failed to parse MEGA API response')); }
                    } else {
                        reject(new Error(`MEGA API error: ${response.status}`));
                    }
                },
                onerror: function() { reject(new Error('Network error calling MEGA API')); }
            });
        });
    }

    function isHashcashResponse(data) {
        if (!Array.isArray(data) || data.length === 0) return false;
        const first = data[0];
        return typeof first === 'object' && first !== null && (first.p !== undefined || first.hashcash !== undefined);
    }

    async function megaApiWithHashcash(body, xhValue, extraHeaders = {}) {
        let data = await megaApiPost(body, extraHeaders);
        if (isHashcashResponse(data)) {
            console.log('[TransferIt] Hashcash challenge, solving...');
            const hcData = await megaApiPost([{ a: 'hc', xh: xhValue }], { 'MEGA-Chrome-Antileak': ANTILEAK_HEADER });
            if (Array.isArray(hcData) && hcData[0]?.hc) {
                data = await megaApiPost(body, { ...extraHeaders, 'X-Hashcash': String(hcData[0].hc) });
            }
        }
        return data;
    }

    // --- URL HELPERS ---
    function getTransferId() {
        const match = window.location.pathname.match(/^\/t\/([a-zA-Z0-9_-]+)/);
        return match ? match[1] : null;
    }

    // --- TRANSFER INFO ---
    async function getTransferInfo(transferId) {
        if (transferInfoCache) return transferInfoCache;
        const data = await megaApiWithHashcash([{ a: 'xi', xh: transferId }], transferId);
        if (!Array.isArray(data) || !data[0] || typeof data[0] !== 'object') throw new Error('Invalid transfer info response');
        const info = data[0];

        // Single file: {zp, size}
        // Multi file: {t, z, m, size, se}
        transferInfoCache = {
            title: info.t ? atob(info.t.replace(/-/g, '+').replace(/_/g, '/')) : '',
            nonce: info.z || null,
            message: info.m ? atob(info.m.replace(/-/g, '+').replace(/_/g, '/')) : '',
            totalSize: Array.isArray(info.size) ? info.size[0] : 0,
            fileCount: Array.isArray(info.size) ? info.size[1] : 0,
            sender: info.se || '',
            expiry: info.zp || 0,
            isSingleFile: !info.t && !info.z
        };
        return transferInfoCache;
    }

    // --- FILE LIST ---
    async function getFileList(transferId) {
        const data = await megaApiWithHashcash(
            [{ a: 'f', c: 1, r: 1, xnc: 1 }],
            transferId,
            { 'MEGA-Chrome-Antileak': `${ANTILEAK_HEADER}&x=${transferId}` }
        );

        if (!Array.isArray(data) || !data[0]?.f) {
            throw new Error('Invalid file list response');
        }

        // Filter leaf files (t=0), sort by timestamp
        const files = data[0].f
            .filter(f => f.t === 0)
            .sort((a, b) => (a.ts || 0) - (b.ts || 0));

        return files.map(f => ({
            handle: f.h,
            size: f.s || 0,
            timestamp: f.ts || 0
        }));
    }

    // --- BUILD FILE MAP ---
    async function buildFileMap(transferId) {
        if (fileMap.size > 0) return fileMap;
        if (fileListPromise) return fileListPromise;

        fileListPromise = (async () => {
            const [apiFiles, domFilenames] = await Promise.all([
                getFileList(transferId),
                waitForDOMFilenames()
            ]);

            console.log(`[TransferIt] API files: ${apiFiles.length}, DOM filenames: ${domFilenames.length}`);

            const count = Math.min(apiFiles.length, domFilenames.length);
            for (let i = 0; i < count; i++) {
                const filename = domFilenames[i];
                const file = apiFiles[i];
                fileMap.set(filename, {
                    handle: file.handle,
                    size: file.size,
                    index: i
                });
            }

            return fileMap;
        })();

        return fileListPromise;
    }

    async function waitForDOMFilenames() {
        for (let i = 0; i < 20; i++) {
            const names = getDOMFilenames();
            if (names.length > 0) return names;
            await new Promise(r => setTimeout(r, 250));
        }
        return [];
    }

    function getDOMFilenames() {
        const results = [];

        // File manager view
        const fmItems = document.querySelectorAll('.js-fm-section:not(.hidden) .it-grid-item');
        fmItems.forEach(item => {
            const el = item.querySelector('span.md-font-size, span.pr-color');
            if (el) {
                const text = el.textContent.trim();
                if (text) results.push(text);
            }
        });
        if (results.length > 0) return results;

        // Link-ready view step-2
        const lrItems = document.querySelectorAll('.js-link-ready-section .body.step-2 .it-grid-item');
        lrItems.forEach(item => {
            const el = item.querySelector('span.md-font-size, span.pr-color');
            if (el) {
                const text = el.textContent.trim();
                if (text) results.push(text);
            }
        });
        if (results.length > 0) return results;

        // Fallback: video extensions
        const allEls = document.querySelectorAll('span, div.file-name, div.name');
        const seen = new Set();
        for (const el of allEls) {
            if (el.offsetParent === null && !el.closest('.js-fm-section, .js-link-ready-section, .js-ready-to-dl-section')) continue;
            const text = el.textContent.trim();
            if (text.match(/\.(mkv|mp4|avi|mov|webm|m4v|flv|wmv|mp3|wav|flac|aac|ogg|srt|ass|sub|zip|rar|7z)$/i) && text.length < 300 && !seen.has(text)) {
                seen.add(text);
                results.push(text);
            }
        }

        return results;
    }

    // --- DOWNLOAD URL ---
    function getDownloadUrl(transferId, fileHandle, filename) {
        const params = new URLSearchParams({ x: transferId, n: fileHandle, fn: filename });
        return `${MEGA_API_BASE}/cs/g?${params.toString()}`;
    }

    // --- ZIP DOWNLOAD URL ---
    function getZipDownloadUrl(transferId, nonce, folderName) {
        // Pattern: fn = folderName.zip (or transferID+nonce.zip if no folderName)
        const fn = folderName ? `${folderName}.zip` : `${transferId}${nonce}.zip`;
        const params = new URLSearchParams({ x: transferId, n: nonce, fn: fn });
        return `${MEGA_API_BASE}/cs/g?${params.toString()}`;
    }

    async function resolveZipDownloadUrl(transferId) {
        const info = await getTransferInfo(transferId);
        if (!info.nonce) {
            throw new Error('Transfer does not support zip download');
        }

        // Use transfer title as folder name (clean up invalid filename chars)
        let folderName = info.title || `${transferId}${info.nonce}`;
        folderName = folderName.replace(/[<>:"/\\|?*]/g, '_').trim();

        const zipUrl = getZipDownloadUrl(transferId, info.nonce, folderName);
        const directUrl = await fetchDirectLink(zipUrl);
        return { url: directUrl, filename: `${folderName}.zip` };
    }

    // --- FETCH DIRECT LINK ---
    function fetchDirectLink(downloadUrl) {
        return fetch(downloadUrl, {
            method: 'GET',
            redirect: 'manual',
            headers: {
                'Referer': 'https://transfer.it/',
                'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8'
            }
        }).then(response => {
            if (response.type === 'opaqueredirect' || response.status === 0) {
                return fetchDirectLinkFallback(downloadUrl);
            }
            const location = response.headers.get('Location') || response.headers.get('location');
            if (location) return location;
            if (response.redirected && response.url && response.url !== downloadUrl) return response.url;
            throw new Error('No redirect Location found');
        }).catch(err => {
            console.warn('[TransferIt] fetch redirect:manual failed:', err);
            return fetchDirectLinkFallback(downloadUrl);
        });
    }

    function fetchDirectLinkFallback(downloadUrl) {
        return new Promise((resolve, reject) => {
            GM_xmlhttpRequest({
                method: "GET",
                url: downloadUrl,
                headers: { "Referer": "https://transfer.it/", "Range": "bytes=0-0" },
                onload: function(response) {
                    const headers = response.responseHeaders || '';
                    const locationMatch = headers.match(/location:\s*(.+)/i);
                    if (locationMatch) { resolve(locationMatch[1].trim()); return; }
                    if (response.finalUrl && response.finalUrl !== downloadUrl) { resolve(response.finalUrl); return; }
                    reject(new Error('No redirect Location found'));
                },
                onerror: function() { reject(new Error('Network error fetching direct link')); }
            });
        });
    }

    // --- RESOLVE DIRECT LINK FOR A FILE ---
    async function resolveDirectLinkForFile(transferId, filename) {
        if (directUrlCache.has(filename)) {
            return directUrlCache.get(filename);
        }

        await buildFileMap(transferId);

        const fileInfo = fileMap.get(filename);
        if (!fileInfo) {
            throw new Error(`File "${filename}" not found. Available: ${[...fileMap.keys()].join(', ')}`);
        }

        const downloadUrl = getDownloadUrl(transferId, fileInfo.handle, filename);
        console.log(`[TransferIt] Fetching: "${filename}" (handle=${fileInfo.handle})`);

        const directUrl = await fetchDirectLink(downloadUrl);
        directUrlCache.set(filename, directUrl);
        console.log(`[TransferIt] Got URL for "${filename}"`);

        return directUrl;
    }

    // --- ICONS ---
    const ICONS = {
        play: '<svg viewBox="0 0 24 24"><path d="M8 5.14v14l11-7-11-7z"/></svg>',
        copy: '<svg viewBox="0 0 24 24"><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"/></svg>',
        download: '<svg viewBox="0 0 24 24"><path d="M19 9h-4V3H9v6H5l7 7 7-7zM5 18v2h14v-2H5z"/></svg>',
        check: '<svg viewBox="0 0 24 24"><path d="M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z"/></svg>',
        loading: '<svg viewBox="0 0 24 24"><path d="M12 4V2A10 10 0 0 0 2 12h2a8 8 0 0 1 8-8z"/></svg>'
    };

    // --- STYLES ---
    GM_addStyle(`
        .ti-file-actions {
            display: inline-flex !important;
            align-items: center !important;
            gap: 3px !important;
            margin-left: 4px !important;
            vertical-align: middle !important;
        }
        .ti-file-btn {
            display: inline-flex !important;
            align-items: center !important;
            justify-content: center !important;
            width: 28px !important;
            height: 28px !important;
            border: 1px solid rgba(255,255,255,0.2) !important;
            border-radius: 6px !important;
            background: rgba(255,255,255,0.1) !important;
            color: #ccc !important;
            cursor: pointer !important;
            padding: 0 !important;
            transition: all 0.15s ease !important;
            font-size: 0 !important;
            line-height: 0 !important;
        }
        .ti-file-btn:hover {
            background: rgba(255,255,255,0.2) !important;
            border-color: rgba(255,255,255,0.4) !important;
            color: #fff !important;
            transform: scale(1.15) !important;
        }
        .ti-file-btn svg { width: 14px !important; height: 14px !important; fill: currentColor !important; }
        .ti-file-btn.play-btn  { color: #4ade80 !important; border-color: rgba(74,222,128,0.3) !important; }
        .ti-file-btn.copy-btn  { color: #60a5fa !important; border-color: rgba(96,165,250,0.3) !important; }
        .ti-file-btn.play-btn:hover  { color: #86efac !important; border-color: rgba(74,222,128,0.6) !important; background: rgba(74,222,128,0.15) !important; }
        .ti-file-btn.copy-btn:hover  { color: #93c5fd !important; border-color: rgba(96,165,250,0.6) !important; background: rgba(96,165,250,0.15) !important; }
        .ti-file-btn.loading svg { animation: ti-spin 0.8s linear infinite !important; fill: #fbbf24 !important; }
        .ti-file-btn:disabled { opacity: 0.3 !important; cursor: not-allowed !important; transform: none !important; }

        .ti-fab {
            position: fixed !important;
            bottom: 24px !important;
            left: 24px !important;
            z-index: 2147483646 !important;
            width: 48px !important;
            height: 48px !important;
            border-radius: 50% !important;
            background: #3B82F6 !important;
            border: 2px solid rgba(255,255,255,0.15) !important;
            color: #fff !important;
            cursor: pointer !important;
            box-shadow: 0 4px 20px rgba(59,130,246,0.4), 0 2px 8px rgba(0,0,0,0.3) !important;
            display: flex !important;
            align-items: center !important;
            justify-content: center !important;
            transition: all 0.2s ease !important;
            padding: 0 !important;
        }
        .ti-fab:hover {
            background: #2563EB !important;
            transform: scale(1.1) !important;
            box-shadow: 0 6px 28px rgba(37,99,235,0.5), 0 2px 12px rgba(0,0,0,0.4) !important;
        }
        .ti-fab svg { width: 22px !important; height: 22px !important; fill: currentColor !important; }
        .ti-fab.panel-open {
            background: #60A5FA !important;
            box-shadow: 0 4px 20px rgba(96,165,250,0.5), 0 2px 8px rgba(0,0,0,0.3) !important;
        }

        .ti-panel {
            position: fixed !important;
            bottom: 82px !important;
            left: 24px !important;
            z-index: 2147483647 !important;
            background: #1F2937 !important;
            border-radius: 12px !important;
            padding: 20px !important;
            color: #F9FAFB !important;
            font-family: 'Nunito Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif !important;
            font-size: 13px !important;
            min-width: 340px !important;
            max-width: 460px !important;
            box-shadow: 0 8px 32px rgba(0,0,0,0.15), 0 2px 8px rgba(0,0,0,0.1) !important;
        }
        .ti-panel.hidden { display: none !important; }

        .ti-header {
            display: flex !important;
            align-items: center !important;
            gap: 10px !important;
            margin-bottom: 12px !important;
            padding-bottom: 12px !important;
            border-bottom: 1px solid #374151 !important;
        }
        .ti-header svg { width: 20px !important; height: 20px !important; fill: #60A5FA !important; flex-shrink: 0 !important; }
        .ti-title { font-weight: 700 !important; font-size: 15px !important; color: #F9FAFB !important; }

        .ti-file-info {
            font-size: 13px !important;
            color: #D1D5DB !important;
            word-break: break-all !important;
            margin-bottom: 4px !important;
            line-height: 1.5 !important;
            font-weight: 600 !important;
        }
        .ti-file-meta {
            font-size: 11px !important;
            color: #9CA3AF !important;
            margin-bottom: 16px !important;
        }

        .ti-actions { display: flex !important; gap: 8px !important; flex-wrap: wrap !important; }
        .ti-btn {
            display: inline-flex !important;
            align-items: center !important;
            gap: 6px !important;
            padding: 10px 18px !important;
            border: none !important;
            border-radius: 8px !important;
            background: #374151 !important;
            color: #D1D5DB !important;
            cursor: pointer !important;
            font-size: 12px !important;
            font-weight: 600 !important;
            font-family: inherit !important;
            transition: all 0.2s ease !important;
            white-space: nowrap !important;
        }
        .ti-btn:hover {
            background: #4B5563 !important;
            color: #F9FAFB !important;
            transform: translateY(-1px) !important;
            box-shadow: 0 4px 12px rgba(0,0,0,0.3) !important;
        }
        .ti-btn:active { transform: translateY(0) !important; }
        .ti-btn svg { width: 14px !important; height: 14px !important; fill: currentColor !important; flex-shrink: 0 !important; }
        .ti-btn.play-btn {
            background: #3B82F6 !important;
            color: #FFFFFF !important;
        }
        .ti-btn.play-btn:hover {
            background: #2563EB !important;
            box-shadow: 0 4px 12px rgba(59,130,246,0.4) !important;
        }
        .ti-btn.copy-btn:hover { color: #60A5FA !important; }
        .ti-btn.dl-btn:hover { color: #60A5FA !important; }
        .ti-btn.loading svg { animation: ti-spin 0.8s linear infinite !important; fill: #60A5FA !important; }
        .ti-btn:disabled { opacity: 0.4 !important; cursor: not-allowed !important; transform: none !important; }

        .ti-status {
            font-size: 11px !important;
            color: rgba(255,255,255,0.35) !important;
            margin-top: 10px !important;
            min-height: 16px !important;
        }
        .ti-status.success { color: #4ade80 !important; }
        .ti-status.error   { color: #f87171 !important; }

        @keyframes ti-spin { 100% { transform: rotate(360deg); } }
    `);

    // --- HELPERS ---
    function formatSize(bytes) {
        if (!bytes || bytes <= 0) return '';
        const units = ['B', 'KB', 'MB', 'GB', 'TB'];
        let i = 0, size = bytes;
        while (size >= 1024 && i < units.length - 1) { size /= 1024; i++; }
        return `${size.toFixed(i > 0 ? 2 : 0)} ${units[i]}`;
    }

    function setPanelStatus(text, type) {
        const el = document.querySelector('.ti-status');
        if (el) { el.textContent = text; el.className = `ti-status ${type || ''}`; }
    }

    function setBtnLoading(btn, isLoading) {
        if (isLoading) {
            btn.dataset.originalIcon = btn.querySelector('svg')?.outerHTML || '';
            const svg = btn.querySelector('svg');
            if (svg) svg.outerHTML = ICONS.loading;
            btn.classList.add('loading');
            btn.disabled = true;
        } else {
            btn.classList.remove('loading');
            btn.disabled = false;
            const svg = btn.querySelector('svg');
            if (svg && btn.dataset.originalIcon) svg.outerHTML = btn.dataset.originalIcon;
        }
    }

    // --- ACTION HANDLER ---
    async function doAction(type, btn, filename) {
        const transferId = getTransferId();
        if (!transferId) return;

        const player = getCurrentPlayer();
        if (type === 'play' && player.key === 'custom' && !player.scheme) {
            alert("Please set custom scheme first via Tampermonkey menu.");
            return;
        }

        const hasFileList = document.querySelector('.js-fm-section:not(.hidden) .it-grid-item') ||
                           document.querySelector('.js-link-ready-section .body.step-2 .it-grid-item');

        if (!hasFileList) {
            const viewBtn = document.querySelector('.js-ready-to-dl-section .js-view-content');
            if (viewBtn && !viewBtn.classList.contains('hidden')) {
                viewBtn.click();
                setPanelStatus('Opening file list... click again!', '');
                return;
            }
            setPanelStatus('Click "View Content" first!', 'error');
            return;
        }

        setBtnLoading(btn, true);

        try {
            const url = await resolveDirectLinkForFile(transferId, filename);

            if (type === 'copy') {
                GM_setClipboard(url);
                setBtnLoading(btn, false);
                const svg = btn.querySelector('svg');
                if (svg) svg.outerHTML = ICONS.check;
                setPanelStatus(`Copied: ${filename}`, 'success');
                setTimeout(() => {
                    const s = btn.querySelector('svg');
                    if (s) s.outerHTML = ICONS.copy;
                    setPanelStatus('', '');
                }, 2000);
            } else if (type === 'play') {
                setBtnLoading(btn, false);
                window.location.href = `${player.scheme}${url}`;
            }
        } catch (err) {
            setBtnLoading(btn, false);
            console.error(`[TransferIt] ${type} error for "${filename}":`, err);
            setPanelStatus(`Error: ${err.message}`, 'error');
        }
    }

    // --- CREATE PER-FILE BUTTONS (Copy + Play only, no Download) ---
    function createFileActions(filename) {
        const group = document.createElement('div');
        group.className = 'ti-file-actions';
        group.dataset.filename = filename;

        const copyBtn = document.createElement('button');
        copyBtn.className = 'ti-file-btn copy-btn';
        copyBtn.title = `Copy link: ${filename}`;
        copyBtn.innerHTML = ICONS.copy;
        copyBtn.addEventListener('click', (e) => { e.preventDefault(); e.stopPropagation(); doAction('copy', copyBtn, filename); });

        const playBtn = document.createElement('button');
        playBtn.className = 'ti-file-btn play-btn';
        playBtn.title = `Play: ${filename}`;
        playBtn.innerHTML = ICONS.play;
        playBtn.addEventListener('click', (e) => { e.preventDefault(); e.stopPropagation(); doAction('play', playBtn, filename); });

        group.appendChild(copyBtn);
        group.appendChild(playBtn);

        return group;
    }

    // --- INJECT INLINE BUTTONS ---
    function injectInlineButtons() {
        const fmItems = document.querySelectorAll('.js-fm-section:not(.hidden) .it-grid-item');
        fmItems.forEach(item => {
            if (item.querySelector('.ti-file-actions')) return;
            const nameEl = item.querySelector('span.md-font-size, span.pr-color');
            if (!nameEl) return;
            const filename = nameEl.textContent.trim();
            if (!filename) return;
            const cols = item.querySelectorAll(':scope > .col');
            if (cols.length === 0) return;
            cols[cols.length - 1].appendChild(createFileActions(filename));
        });

        const lrItems = document.querySelectorAll('.js-link-ready-section .body.step-2 .it-grid-item');
        lrItems.forEach(item => {
            if (item.querySelector('.ti-file-actions')) return;
            const nameEl = item.querySelector('span.md-font-size, span.pr-color');
            if (!nameEl) return;
            const filename = nameEl.textContent.trim();
            if (!filename) return;
            const cols = item.querySelectorAll(':scope > .col');
            if (cols.length === 0) return;
            cols[cols.length - 1].appendChild(createFileActions(filename));
        });
    }

    // --- FLOATING PANEL ---
    let panelHost = null;

    function createPanelHost() {
        if (panelHost) return panelHost;

        panelHost = GM_addElement(document.documentElement, 'div', { id: 'ti-panel-host' });
        panelHost.style.cssText = 'position:fixed!important;z-index:2147483647!important;pointer-events:none!important;top:0!important;left:0!important;width:0!important;height:0!important;overflow:visible!important;';

        const fab = GM_addElement(panelHost, 'button', { class: 'ti-fab', title: 'Toggle Transfer.it Tools' });
        fab.innerHTML = ICONS.download;
        fab.style.pointerEvents = 'auto';
        fab.addEventListener('click', togglePanel);

        const panel = GM_addElement(panelHost, 'div', { class: 'ti-panel hidden' });
        panel.style.pointerEvents = 'auto';

        panel.innerHTML = `
            <div class="ti-header">
                <svg viewBox="0 0 24 24"><path d="M19 9h-4V3H9v6H5l7 7 7-7zM5 18v2h14v-2H5z"/></svg>
                <span class="ti-title">Transfer.it Tools</span>
            </div>
            <div class="ti-file-info" id="ti-info">Loading...</div>
            <div class="ti-file-meta" id="ti-meta"></div>
            <div class="ti-actions" id="ti-actions"></div>
            <div class="ti-status" id="ti-status">Waiting...</div>
        `;

        return panelHost;
    }

    function togglePanel() {
        const host = createPanelHost();
        const panel = host.querySelector('.ti-panel');
        const fab = host.querySelector('.ti-fab');
        const isHidden = panel.classList.contains('hidden');

        if (isHidden) {
            panel.classList.remove('hidden');
            fab.classList.add('panel-open');
            fab.innerHTML = '<svg viewBox="0 0 24 24"><path d="M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z"/></svg>';
        } else {
            panel.classList.add('hidden');
            fab.classList.remove('panel-open');
            fab.innerHTML = ICONS.download;
        }
    }

    async function updatePanel(host) {
        const transferId = getTransferId();
        if (!transferId) return;

        try {
            const info = await getTransferInfo(transferId);
            const panel = host.querySelector('.ti-panel');
            if (!panel) return;

            const infoEl = panel.querySelector('#ti-info');
            const metaEl = panel.querySelector('#ti-meta');
            const actionsEl = panel.querySelector('#ti-actions');

            const isSingleFile = info.isSingleFile || info.fileCount === 1;

            if (infoEl) infoEl.textContent = info.title || (isSingleFile ? 'Single file transfer' : `${info.fileCount} files`);
            if (metaEl) metaEl.textContent = `${formatSize(info.totalSize)}${info.sender ? ' • from ' + info.sender : ''}`;

            // Build action buttons based on file count
            actionsEl.innerHTML = '';

            if (isSingleFile) {
                // Single file: Copy only
                actionsEl.innerHTML = `
                    <button class="ti-btn copy-btn" id="ti-copy" disabled>${ICONS.copy} Copy Link</button>
                `;

                panel.querySelector('#ti-copy').addEventListener('click', async function() {
                    const filenames = getDOMFilenames();
                    if (filenames.length === 0) {
                        setPanelStatus('No file found', 'error');
                        return;
                    }
                    await doAction('copy', this, filenames[0]);
                });
            } else {
                // Multi file: Copy All Links + Copy Zipped Link
                actionsEl.innerHTML = `
                    <button class="ti-btn copy-btn" id="ti-copy-all" disabled>${ICONS.copy} Copy All Links</button>
                    <button class="ti-btn copy-btn" id="ti-copy-zip" disabled>${ICONS.copy} Copy Zipped Link</button>
                `;

                panel.querySelector('#ti-copy-all').addEventListener('click', async function() {
                    const originalHtml = this.innerHTML;
                    setBtnLoading(this, true);
                    try {
                        const names = getDOMFilenames();
                        if (names.length === 0) {
                            throw new Error('No files found in DOM. Make sure file list is visible.');
                        }

                        const urls = [];
                        for (let i = 0; i < names.length; i++) {
                            try {
                                const url = await resolveDirectLinkForFile(transferId, names[i]);
                                urls.push(url);
                            } catch (fileErr) {
                                console.warn(`[TransferIt] Copy All: Failed for ${names[i]}:`, fileErr);
                            }
                        }

                        if (urls.length === 0) {
                            throw new Error('Failed to get any download URLs');
                        }

                        GM_setClipboard(urls.join('\n'));
                        setBtnLoading(this, false);
                        this.innerHTML = `${ICONS.check} Copied ${urls.length} links!`;
                        this.style.background = '#10B981';
                        this.style.color = '#FFFFFF';
                        setPanelStatus(`Copied ${urls.length} of ${names.length} links!`, 'success');
                        setTimeout(() => {
                            this.innerHTML = originalHtml;
                            this.style.background = '';
                            this.style.color = '';
                        }, 2000);
                    } catch (err) {
                        setBtnLoading(this, false);
                        setPanelStatus(`Error: ${err.message}`, 'error');
                    }
                });

                panel.querySelector('#ti-copy-zip').addEventListener('click', async function() {
                    const originalHtml = this.innerHTML;
                    setBtnLoading(this, true);
                    try {
                        const result = await resolveZipDownloadUrl(transferId);
                        GM_setClipboard(result.url);
                        setBtnLoading(this, false);
                        this.innerHTML = `${ICONS.check} Copied!`;
                        this.style.background = '#10B981';
                        this.style.color = '#FFFFFF';
                        setPanelStatus('Zip link copied to clipboard!', 'success');
                        setTimeout(() => {
                            this.innerHTML = originalHtml;
                            this.style.background = '';
                            this.style.color = '';
                        }, 2000);
                    } catch (err) {
                        setBtnLoading(this, false);
                        setPanelStatus(`Error: ${err.message}`, 'error');
                    }
                });
            }

            // Enable buttons
            actionsEl.querySelectorAll('.ti-btn').forEach(btn => btn.disabled = false);
            setPanelStatus(`Ready — ${getCurrentPlayer().name}`, 'success');
        } catch (err) {
            console.error('[TransferIt] Panel update error:', err);
            setPanelStatus(err.message, 'error');
        }
    }

    // --- INIT ---
    let isInitializing = false;
    let lastUrl = '';

    async function init() {
        const transferId = getTransferId();
        if (!transferId) {
            if (panelHost) { panelHost.remove(); panelHost = null; }
            return;
        }

        injectInlineButtons();

        const host = createPanelHost();

        if (!isInitializing && lastUrl !== window.location.href) {
            isInitializing = true;
            lastUrl = window.location.href;
            fileMap.clear();
            directUrlCache.clear();
            transferInfoCache = null;
            fileListPromise = null;

            await updatePanel(host);
            isInitializing = false;
        }
    }

    let retryCount = 0;
    const MAX_RETRIES = 40;
    const RETRY_MS = 500;

    function tryInit() {
        init();
        const transferId = getTransferId();
        if (transferId && retryCount < MAX_RETRIES) {
            retryCount++;
            setTimeout(tryInit, RETRY_MS);
        }
    }

    let lastPathname = window.location.pathname;
    setInterval(() => {
        if (window.location.pathname !== lastPathname) {
            lastPathname = window.location.pathname;
            retryCount = 0;
            isInitializing = false;
            fileMap.clear();
            directUrlCache.clear();
            transferInfoCache = null;
            fileListPromise = null;
            if (panelHost) { panelHost.remove(); panelHost = null; }
            tryInit();
        }
    }, 500);

    const observer = new MutationObserver(() => {
        if (getTransferId()) {
            injectInlineButtons();
            if (!panelHost && !isInitializing) {
                retryCount = 0;
                tryInit();
            }
        }
    });
    observer.observe(document.body || document.documentElement, { childList: true, subtree: true });

    tryInit();

})();