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const express = require('express');
const multer = require('multer');
const { Storage, File } = require('megajs'); 
const fs = require('fs');
require('dotenv').config();

const app = express();
const port = process.env.PORT || 7860;

// Setup penyimpanan sementara untuk upload transit
const upload = multer({ dest: '/tmp/' });

app.use(express.json());

let megaStorage;
// Variabel tracker statis sederhana (akan ter-reset jika space restart/tidur)
let totalFiles = 0;
let totalBytes = 0;
let totalDownloads = 0;

// Fungsi format ukuran biner
function formatBytes(bytes, decimals = 2) {
    if (!bytes) return '0 B';
    const k = 1024;
    const dm = decimals < 0 ? 0 : decimals;
    const sizes = ['B', 'KB', 'MB', 'GB', 'TB'];
    const i = Math.floor(Math.log(bytes) / Math.log(k));
    return parseFloat((bytes / Math.pow(k, i)).toFixed(dm)) + ' ' + sizes[i];
}

async function connectStorage() {
    return new Promise((resolve, reject) => {
        const email = process.env.MEGA_EMAIL;
        const password = process.env.MEGA_PASSWORD;

        if (!email || !password) {
            console.error("ERROR: Variabel lingkungan kredensial belum diatur!");
            return reject("Kredensial kosong");
        }

        const storage = new Storage({
            email: email,
            password: password,
            keepalive: true
        }, (err) => {
            if (err) return reject(err);
            console.log('✓ Sistem backend CDN siap dan terhubung!');
            resolve(storage);
        });
    });
}

connectStorage().then(storage => {
    megaStorage = storage;
}).catch(err => {
    console.error('⚠️ Gagal menginisialisasi storage:', err);
});

// Endpoint 1: Frontend Dashboard Utama (Tema Putih Bersih Premium)
app.get('/', (req, res) => {
    const hostUrl = `${req.protocol}://${req.get('host')}`;
    res.send(`
    <!DOCTYPE html>
    <html lang="id">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>CDN FAREL - Secure CDN Gateway</title>
        <style>
            :root {
                --bg-main: #f8fafc;
                --bg-card: #ffffff;
                --text-main: #0f172a;
                --text-muted: #64748b;
                --border-color: #e2e8f0;
                --accent: #ff4757;
                --accent-hover: #ff6b81;
                --indigo: #4f46e5;
                --success: #10b981;
            }
            * { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Segoe UI', system-ui, -apple-system, sans-serif; }
            body { background: var(--bg-main); color: var(--text-main); padding: 40px 20px; line-height: 1.5; }
            .container { max-width: 1000px; margin: 0 auto; }
            
            /* Header */
            header { text-align: center; margin-bottom: 40px; }
            header h1 { font-size: 2.2rem; font-weight: 800; tracking-spacing: -0.05em; color: var(--text-main); }
            header h1 span { color: var(--accent); }
            header p.tagline { font-size: 1.1rem; color: var(--text-muted); font-weight: 500; margin-top: 5px; }
            header p.desc { max-width: 600px; margin: 10px auto 0; color: var(--text-muted); font-size: 0.95rem; }

            /* Grid Statistik */
            .stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; margin-bottom: 40px; }
            .stat-card { background: var(--bg-card); padding: 24px; border-radius: 12px; border: 1px solid var(--border-color); box-shadow: 0 1px 3px rgba(0,0,0,0.02); }
            .stat-card h3 { font-size: 2rem; font-weight: 700; color: var(--text-main); margin-bottom: 4px; }
            .stat-card p.label { font-size: 0.9rem; font-weight: 600; color: var(--text-main); }
            .stat-card p.sub { font-size: 0.8rem; color: var(--text-muted); }

            /* Card Utama */
            .card { background: var(--bg-card); padding: 40px; border-radius: 16px; border: 1px solid var(--border-color); box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03); margin-bottom: 40px; }
            .card-title { font-size: 1.4rem; font-weight: 700; margin-bottom: 6px; }
            .card-subtitle { font-size: 0.95rem; color: var(--text-muted); margin-bottom: 25px; }

            /* Dropzone */
            .upload-box { border: 2px dashed #cbd5e1; padding: 50px 20px; text-align: center; border-radius: 12px; cursor: pointer; transition: all 0.2s ease; background: #f8fafc; }
            .upload-box:hover { border-color: var(--accent); background: #fff5f5; }
            .upload-box p.primary-text { font-size: 1.05rem; font-weight: 600; color: var(--text-main); margin-bottom: 4px; }
            .upload-box p.secondary-text { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 15px; }
            .upload-box p.info-text { font-size: 0.85rem; color: var(--text-muted); line-height: 1.4; background: #fff; padding: 8px 12px; border-radius: 6px; display: inline-block; border: 1px solid var(--border-color); }
            input[type="file"] { display: none; }
            
            button.btn-upload { background: var(--accent); color: white; border: none; padding: 14px 30px; border-radius: 8px; font-weight: 700; cursor: pointer; width: 100%; margin-top: 20px; font-size: 16px; transition: background 0.2s; }
            button.btn-upload:hover { background: var(--accent-hover); }

            /* Hasil Upload */
            .result { margin-top: 30px; display: none; background: #f0fdf4; padding: 25px; border-radius: 10px; border: 1px solid #bbf7d0; }
            .result h3 { margin-bottom: 12px; color: #166534; font-size: 1.15rem; display: flex; align-items: center; gap: 8px; }
            .result p { font-size: 0.95rem; margin-bottom: 10px; color: var(--text-main); }
            .result-link-box { background: #ffffff; padding: 12px; border-radius: 6px; border: 1px solid #dcfce7; display: flex; align-items: center; justify-content: space-between; margin-top: 10px; gap: 10px; }
            .result-link-box a { color: var(--indigo); word-break: break-all; font-weight: 600; text-decoration: none; font-size: 0.9rem; overflow: hidden; text-overflow: ellipsis; }
            .result-link-box a:hover { text-decoration: underline; }
            .btn-copy-link { background: var(--text-main); color: #fff; border: none; padding: 6px 12px; border-radius: 4px; font-size: 0.8rem; font-weight: 600; cursor: pointer; white-space: nowrap; }
            
            .status { text-align: center; margin-top: 15px; color: var(--indigo); font-weight: 600; font-size: 0.95rem; display: none; }

            /* Fitur & Manfaat Kelebihan */
            .section-title { font-size: 1.6rem; font-weight: 800; text-align: center; margin-bottom: 6px; }
            .section-subtitle { text-align: center; color: var(--text-muted); font-size: 0.95rem; margin-bottom: 35px; }
            .features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 25px; margin-bottom: 5px; }
            .feature-item { background: var(--bg-card); padding: 30px; border-radius: 12px; border: 1px solid var(--border-color); }
            .feature-item h4 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; color: var(--text-main); }
            .feature-item p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.5; }

            /* Dokumentasi API Section */
            .api-card { background: var(--bg-card); border-radius: 14px; border: 1px solid var(--border-color); margin-top: 40px; overflow: hidden; }
            .api-header { padding: 25px; border-bottom: 1px solid var(--border-color); background: #fafafa; }
            .api-badge-row { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
            .badge-method { background: var(--success); color: white; padding: 4px 10px; border-radius: 4px; font-weight: 700; font-size: 0.8rem; }
            .badge-type { background: #e2e8f0; color: var(--text-main); padding: 4px 10px; border-radius: 4px; font-weight: 600; font-size: 0.8rem; }
            .api-endpoint { font-family: monospace; font-size: 1.1rem; font-weight: 700; color: var(--text-main); }
            .api-desc { padding: 0 25px 20px; font-size: 0.9rem; color: var(--text-muted); border-bottom: 1px solid var(--border-color); background: #fafafa; }
            
            /* Code tabs */
            .api-body { padding: 25px; background: #1e293b; color: #f8fafc; }
            .tab-header { display: flex; gap: 8px; margin-bottom: 15px; border-bottom: 1px solid #334155; padding-bottom: 10px; }
            .tab-btn { background: transparent; color: #94a3b8; border: none; padding: 6px 14px; font-size: 0.85rem; font-weight: 600; cursor: pointer; border-radius: 4px; }
            .tab-btn.active { background: #334155; color: #fff; }
            .code-container { position: relative; }
            pre { font-family: 'Courier New', Courier, monospace; font-size: 0.85rem; overflow-x: auto; white-space: pre-wrap; word-break: break-all; color: #e2e8f0; line-height: 1.5; }
            .btn-copy-code { position: absolute; top: 0; right: 0; background: #334155; color: #f8fafc; border: none; padding: 5px 10px; border-radius: 4px; font-size: 0.75rem; cursor: pointer; font-weight: 600; }
            .btn-copy-code:hover { background: #475569; }
            .cors-text { font-size: 0.75rem; font-weight: 700; color: #38bdf8; letter-spacing: 0.05em; margin-top: 15px; display: inline-block; }

            /* Footer */
            footer { border-top: 1px solid var(--border-color); margin-top: 60px; padding-top: 30px; color: var(--text-muted); font-size: 0.85rem; }
            .footer-top { display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 20px; margin-bottom: 20px; }
            .footer-brand h5 { font-size: 1.1rem; font-weight: 800; color: var(--text-main); margin-bottom: 4px; }
            .footer-meta { display: flex; gap: 15px; font-weight: 600; color: var(--text-main); font-size: 0.85rem; }
            .footer-bottom { display: flex; justify-content: space-between; align-items: center; border-top: 1px solid var(--border-color); padding-top: 20px; color: var(--text-muted); font-size: 0.8rem; }
        </style>
    </head>
    <body>

    <div class="container">
        <!-- Header -->
        <header>
            <h1>CDN <span>FAREL</span></h1>
            <p class="tagline">Secure CDN Gateway</p>
            <p class="desc">Unggah Berkas, Dapatkan Direct Link</p>
            <p class="desc" style="font-size: 0.85rem; margin-top: 5px; max-width: 500px;">Sistem direct link CDN mandiri berkecepatan tinggi dengan enkripsi awan ganda yang aman dan global.</p>
        </header>

        <!-- Grid Statistik -->
        <div class="stats-grid">
            <div class="stat-card">
                <h3 id="statFiles">${totalFiles}</h3>
                <p class="label">Total File Aktif</p>
                <p class="sub">Seluruh file yang tersimpan di CDN</p>
            </div>
            <div class="stat-card">
                <h3 id="statBytes">${formatBytes(totalBytes)}</h3>
                <p class="label">Kapasitas Terpakai</p>
                <p class="sub">Total kapasitas cloud terpakai</p>
            </div>
            <div class="stat-card">
                <h3 id="statDownloads">${totalDownloads}</h3>
                <p class="label">Total Pengunduhan</p>
                <p class="sub">File dikonsumsi via link CDN</p>
            </div>
            <div class="stat-card">
                <h3>1</h3>
                <p class="label">Node Storage Cluster</p>
                <p class="sub">Penyimpanan cloud node terenkripsi aktif</p>
            </div>
        </div>

        <!-- Card Upload Dropzone -->
        <div class="card">
            <h2 class="card-title">Unggah Berkas ke CDN Farel</h2>
            <p class="card-subtitle">Dapatkan direct link, embedding, dan direct download berkecepatan tinggi instan dengan mengunggah berkas ke gateway kami.</p>
            
            <form id="uploadForm">
                <div class="upload-box" onclick="document.getElementById('fileInput').click()" id="dropzone">
                    <p class="primary-text" id="boxText">Seret & taruh berkas di sini, atau pilih manual</p>
                    <p class="secondary-text">Semua format file didukung (Maks 100 MB)</p>
                    <p class="info-text">Pilih atau seret berkas ke dropzone untuk mempersiapkan pratinjau dan mengaktifkan tautan CDN.</p>
                    <input type="file" id="fileInput" name="file" required onchange="updateBoxText()">
                </div>
                <button type="submit" class="btn-upload">UNGGAH KE CDN</button>
            </form>

            <div class="status" id="statusText">Sedang memproses berkas... Harap tunggu...</div>

            <!-- Box Hasil Output -->
            <div class="result" id="resultBox">
                <h3>🎉 Berkas Berhasil Diproses!</h3>
                <p><strong>Nama Berkas:</strong> <span id="resName"></span></p>
                <p style="font-weight: 600; margin-top: 15px; font-size: 0.9rem; color: #15803d;">Link CDN Anda:</p>
                <div class="result-link-box">
                    <a id="resCdn" href="#" target="_blank"></a>
                    <button class="btn-copy-link" onclick="copyLinkOutput()">Copy Link</button>
                </div>
            </div>
        </div>

        <!-- Section Kelebihan -->
        <h2 class="section-title">Manfaat & Kelebihan CDN FAREL</h2>
        <p class="section-subtitle">Infrastruktur andal yang dioptimalkan untuk performa pengiriman aset digital terbaik.</p>

        <div class="features-grid">
            <div class="feature-item">
                <h4>Direct Streaming Link</h4>
                <p>Dapatkan link bersih langsung tanpa halaman pengalihan, iklan, atau timer. Sempurna untuk disematkan langsung pada HTML, Markdown, stylesheet, atau tag media web.</p>
            </div>
            <div class="feature-item">
                <h4>Bebas Hambatan CORS</h4>
                <p>Mendukung kebijakan penuh Cross-Origin Resource Sharing (CORS). Integrasikan aset seperti gambar kustom, font kustom, atau file JSON dari domain manapun secara mulus.</p>
            </div>
            <div class="feature-item">
                <h4>Penyimpanan MEGA Aman</h4>
                <p>Semua aset diunggah langsung dan disimpan ke dalam penyimpanan awan MEGA terenkripsi yang aman untuk menjamin ketersediaan data Anda tetap utuh, aman, dan dapat diakses terus.</p>
            </div>
            <div class="feature-item">
                <h4>MIME Type yang Tepat</h4>
                <p>Deteksi tipe konten otomatis secara cerdas. Server menyajikan berkas dengan header <code>Content-Type</code> yang akurat agar dapat di-render atau diputar langsung di browser.</p>
            </div>
            <div class="feature-item">
                <h4>Kapasitas Besar 100MB</h4>
                <p>Kirim berkas media berukuran besar seperti video klip, track musik berkualitas tinggi, dokumen PDF tebal, hingga kompresi zip tanpa takut batasan ukuran yang kecil.</p>
            </div>
            <div class="feature-item">
                <h4>Arsip Selamanya (Persistent)</h4>
                <p>Berkas tidak memiliki batas kedaluwarsa waktu. File Anda tetap tersimpan utuh di gateway awan tanpa kekhawatiran akan terhapus otomatis setelah beberapa hari.</p>
            </div>
        </div>

        <!-- Section API Dokumentasi -->
        <div class="api-card">
            <div class="api-header">
                <div class="api-badge-row">
                    <span class="badge-method">POST</span>
                    <span class="badge-type">multipart/form-data</span>
                </div>
                <div class="api-endpoint">/api/upload</div>
            </div>
            <div class="api-desc">
                Gunakan endpoint pengunggahan file dari CDN FAREL untuk mengotomatiskan proses upload file langsung dari aplikasi, skrip backend, website, atau bot Anda. Kirim berkas Anda pada parameter body bernama <code>file</code>. Respon akan mengembalikan URL streaming langsung secara instan.
            </div>
            <div class="api-body">
                <div class="tab-header">
                    <button class="tab-btn active" onclick="switchTab('curl')">cURL</button>
                    <button class="tab-btn" onclick="switchTab('js')">javascript</button>
                    <button class="tab-btn" onclick="switchTab('py')">python</button>
                </div>
                <div class="code-container">
                    <button class="btn-copy-code" onclick="copyCodeSnippet()">Copy Snippet</button>
                    <pre id="codeBlock">curl -X POST "${hostUrl}/api/upload" \\\n  -F "file=@/path/to/your/file.png"</pre>
                </div>
                <span class="cors-text">CORS ENABLED</span>
            </div>
        </div>

        <!-- Footer -->
        <footer>
            <div class="footer-top">
                <div class="footer-brand">
                    <h5>CDN FAREL</h5>
                    <p>Penyimpanan awan performa tinggi dan gerbang distribusi direct link aman.</p>
                </div>
                <div class="footer-meta">
                    <span>Node Kluster Utama Aktif</span>
                    <span>|</span>
                    <span>SSL Terenkripsi</span>
                    <span>|</span>
                    <span>CORS Terbuka</span>
                </div>
            </div>
            <div class="footer-bottom">
                <p>&copy; 2026 CDN FAREL. Hak Cipta Dilindungi.</p>
                <p>v1.4.0 Production &bull; SLA 99.9%</p>
            </div>
        </footer>
    </div>

    <script>
        const hostBase = "${hostUrl}";
        let currentTab = 'curl';

        // Snippets generator dinamis sesuai host saat ini
        const snippets = {
            curl: \`curl -X POST "\${hostBase}/api/upload" \\\n  -F "file=@/path/to/your/file.png"\`,
            js: \`const data = new FormData();\ndata.append('file', fileInput.files[0]);\n\nfetch('\${hostBase}/api/upload', {\n  method: 'POST',\n  body: data\n})\n.then(res => res.json())\n.then(json => console.log(json.cdnLink));\`,
            py: \`import requests\n\nurl = "\${hostBase}/api/upload"\nfiles = {'file': open('file.png', 'rb')}\nr = requests.post(url, files=files)\nprint(r.json()['cdnLink'])\`
        };

        function switchTab(lang) {
            currentTab = lang;
            document.querySelectorAll('.tab-btn').forEach(btn => btn.classList.remove('active'));
            event.target.classList.add('active');
            document.getElementById('codeBlock').innerText = snippets[lang];
        }

        function copyCodeSnippet() {
            navigator.clipboard.writeText(snippets[currentTab]);
            alert('Snippet kode berhasil disalin!');
        }

        function copyLinkOutput() {
            const linkText = document.getElementById('resCdn').innerText;
            navigator.clipboard.writeText(linkText);
            alert('Tautan CDN berhasil disalin!');
        }

        function updateBoxText() {
            const input = document.getElementById('fileInput');
            if(input.files.length > 0) {
                document.getElementById('boxText').innerText = "Berkas terpilih: " + input.files[0].name;
            }
        }

        // Setup Drag and Drop
        const dropzone = document.getElementById('dropzone');
        const fileInput = document.getElementById('fileInput');

        ['dragenter', 'dragover'].forEach(eventName => {
            dropzone.addEventListener(eventName, (e) => { e.preventDefault(); dropzone.style.borderColor = 'var(--accent)'; }, false);
        });
        ['dragleave', 'drop'].forEach(eventName => {
            dropzone.addEventListener(eventName, (e) => { e.preventDefault(); dropzone.style.borderColor = '#cbd5e1'; }, false);
        });
        dropzone.addEventListener('drop', (e) => {
            fileInput.files = e.dataTransfer.files;
            updateBoxText();
        });

        // Submit form lewat AJAX
        document.getElementById('uploadForm').addEventListener('submit', async (e) => {
            e.preventDefault();
            if (fileInput.files.length === 0) return;

            const formData = new FormData();
            formData.append('file', fileInput.files[0]);

            const statusText = document.getElementById('statusText');
            const resultBox = document.getElementById('resultBox');
            
            statusText.style.display = "block";
            resultBox.style.display = "none";

            try {
                const response = await fetch('/api/upload', {
                    method: 'POST',
                    body: formData
                });
                const data = await response.json();

                if (data.success) {
                    statusText.style.display = "none";
                    document.getElementById('resName').innerText = data.fileName;
                    document.getElementById('resCdn').innerText = data.cdnLink;
                    document.getElementById('resCdn').href = data.cdnLink;
                    resultBox.style.display = "block";

                    // Update UI statistik secara real-time di halaman
                    if(data.stats) {
                        document.getElementById('statFiles').innerText = data.stats.files;
                        document.getElementById('statBytes').innerText = data.stats.formattedBytes;
                    }
                } else {
                    statusText.innerText = "Gagal memproses: " + data.error;
                }
            } catch (err) {
                statusText.innerText = "Terjadi kesalahan sistem saat memproses berkas.";
                console.error(err);
            }
        });
    </script>
    </body>
    </html>
    `);
});

// Endpoint 2: API Proses Upload File (Update data stat secara real-time)
app.post('/api/upload', upload.single('file'), async (req, res) => {
    if (!megaStorage) return res.status(503).json({ error: 'Storage backend belum siap' });
    if (!req.file) return res.status(400).json({ error: 'Tidak ada file yang dikirim' });

    try {
        const filePath = req.file.path;
        const fileName = req.file.originalname;
        const fileSize = req.file.size;
        const fileStream = fs.createReadStream(filePath);

        // Upload berkas ke cloud storage MEGA
        const megaFile = await megaStorage.upload({
            name: fileName,
            size: fileSize
        }, fileStream).complete;

        // Dapatkan tautan cloud publik internal
        const downloadLink = await megaFile.link();
        
        // Hapus file transit di lokal (/tmp/)
        fs.unlinkSync(filePath);

        // Ubah '#' menjadi '-' agar aman dilewati via URL Express Gateway
        const fileId = downloadLink.split('/file/')[1].replace('#', '-');

        // Tambah counter statistik internal server
        totalFiles += 1;
        totalBytes += fileSize;

        res.json({
            success: true,
            fileName: fileName,
            cdnLink: `${req.protocol}://${req.get('host')}/cdn/${fileId}`,
            stats: {
                files: totalFiles,
                formattedBytes: formatBytes(totalBytes)
            }
        });

    } catch (error) {
        console.error(error);
        res.status(500).json({ error: 'Gagal memproses penyimpanan: ' + error.message });
    }
});

// Endpoint 3: Proxy CDN Gateway (Streaming Data Langsung + Dukungan CORS)
app.get('/cdn/:fileIdAndKey', async (req, res) => {
    try {
        const fullId = req.params.fileIdAndKey;
        
        // Kembalikan karakter '-' menjadi '#' untuk menyusun URL asli MEGA
        const correctedId = fullId.replace('-', '#');
        const targetUrl = `https://mega.nz/file/${correctedId}`;
        
        const file = File.fromURL(targetUrl);
        await file.loadAttributes();

        // Dukungan Penuh Kebijakan CORS
        res.setHeader('Access-Control-Allow-Origin', '*');
        res.setHeader('Access-Control-Allow-Methods', 'GET, HEAD, OPTIONS');
        res.setHeader('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');

        // Atur header disposisi agar browser langsung memutar/merender inline aset
        res.setHeader('Content-Disposition', `inline; filename="${file.name}"`);
        
        // Tambah hit counter unduhan
        totalDownloads += 1;

        // Alirkan data secara streaming waktu nyata ke pengguna luar
        const stream = file.download();
        stream.pipe(res);
    } catch (error) {
        console.error(error);
        res.status(404).send('Berkas tidak ditemukan atau tautan CDN salah.');
    }
});

app.listen(port, () => {
    console.log(`Server CDN Farel berjalan aktif pada port ${port}`);
});