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<!DOCTYPE html>
<html lang="en" class="dark">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>DeepFilterNet Pro | Offline Audio Studio</title>
    
    <!-- PWA Setup (Generated Inline) -->
    <script>
        const manifest = {
            name: "DeepFilterNet Pro",
            short_name: "DFN Pro",
            start_url: ".",
            display: "standalone",
            background_color: "#0f172a",
            theme_color: "#3b82f6",
            icons: [{
                src: "data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%233b82f6' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 2a3 3 0 0 0-3 3v7a3 3 0 0 0 6 0V5a3 3 0 0 0-3-3Z'/%3E%3Cpath d='M19 10v2a7 7 0 0 1-14 0v-2'/%3E%3Cline x1='12' x2='12' y1='19' y2='22'/%3E%3C/svg%3E",
                sizes: "512x512",
                type: "image/svg+xml"
            }]
        };
        const manifestLink = document.createElement('link');
        manifestLink.rel = 'manifest';
        manifestLink.href = 'data:application/manifest+json;charset=utf-8,' + encodeURIComponent(JSON.stringify(manifest));
        document.head.appendChild(manifestLink);

        if ('serviceWorker' in navigator) {
            const swCode = `
                self.addEventListener('install', (e) => self.skipWaiting());
                self.addEventListener('activate', (e) => self.clients.claim());
                self.addEventListener('fetch', (e) => {});
            `;
            const blob = new Blob([swCode], { type: 'application/javascript' });
            navigator.serviceWorker.register(URL.createObjectURL(blob)).catch(console.error);
        }
    </script>

    <script src="https://cdn.tailwindcss.com"></script>
    <script src="https://unpkg.com/lucide@latest"></script>
    
    <!-- External Libs for Batching and MP3 Encoding -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jszip/3.10.1/jszip.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/lamejs/1.2.1/lame.min.js"></script>

    <script>
        tailwind.config = {
            darkMode: 'class',
            theme: {
                extend: {
                    colors: { primary: { 50: '#eff6ff', 100: '#dbeafe', 500: '#3b82f6', 600: '#2563eb', 900: '#1e3a8a' } }
                }
            }
        }
    </script>
    <style>
        .drag-active { border-color: #3b82f6 !important; background-color: rgba(59, 130, 246, 0.1) !important; }
        .hidden { display: none !important; }
        .spinner { animation: spin 1s linear infinite; }
        @keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
        /* Custom Scrollbar for Queue */
        ::-webkit-scrollbar { width: 6px; }
        ::-webkit-scrollbar-track { background: transparent; }
        ::-webkit-scrollbar-thumb { background: #334155; border-radius: 4px; }
        ::-webkit-scrollbar-thumb:hover { background: #475569; }
    </style>
</head>
<body class="bg-slate-900 text-slate-200 min-h-screen font-sans selection:bg-primary-500 selection:text-white pb-12 overflow-x-hidden">
    
    <div class="max-w-7xl mx-auto px-4 pt-8">
        <!-- Header -->
        <header class="flex flex-col md:flex-row items-center justify-between mb-8 gap-4 border-b border-slate-800 pb-6">
            <div class="flex items-center gap-4">
                <div class="inline-flex items-center justify-center p-3 bg-primary-900/50 rounded-2xl border border-primary-500/30 text-primary-500 shadow-[0_0_15px_rgba(59,130,246,0.2)]">
                    <i data-lucide="mic" class="w-6 h-6"></i>
                    <i data-lucide="sparkles" class="w-4 h-4 absolute transform translate-x-3 -translate-y-3 text-yellow-400"></i>
                </div>
                <div>
                    <h1 class="text-3xl font-bold text-white tracking-tight">DeepFilterNet Pro</h1>
                    <p class="text-slate-400 text-sm flex items-center gap-1">
                        <i data-lucide="shield-check" class="w-3 h-3 text-green-400"></i> Local & Offline processing
                    </p>
                </div>
            </div>

            <!-- Global Settings -->
            <div class="bg-slate-800/80 p-3 rounded-xl border border-slate-700 flex flex-wrap items-center gap-6 shadow-lg">
                <div class="flex items-center gap-2">
                    <i data-lucide="sliders-horizontal" class="w-4 h-4 text-slate-400"></i>
                    <div class="flex flex-col">
                        <label class="text-xs font-semibold text-slate-400 uppercase tracking-wider">Noise Reduction</label>
                        <div class="flex items-center gap-2">
                            <input type="range" id="noiseLevel" min="0" max="100" value="100" class="w-24 accent-primary-500 h-1 bg-slate-700 rounded-lg cursor-pointer">
                            <span id="noiseLevelValue" class="text-xs text-primary-400 font-bold w-6">100</span>
                        </div>
                    </div>
                </div>
                
                <div class="h-8 w-px bg-slate-700 hidden sm:block"></div>
                
                <div class="flex items-center gap-4">
                    <label class="flex items-center gap-2 cursor-pointer group">
                        <input type="checkbox" id="normalizeCheck" checked class="w-4 h-4 rounded border-slate-600 bg-slate-700 text-primary-500 focus:ring-primary-500 focus:ring-offset-slate-900 cursor-pointer">
                        <span class="text-sm font-medium text-slate-300 group-hover:text-white transition-colors">Auto-Normalize</span>
                    </label>

                    <div class="flex items-center bg-slate-900 rounded-lg p-1 border border-slate-700">
                        <button id="formatWav" class="px-3 py-1 text-xs font-bold rounded-md bg-primary-600 text-white transition-all">WAV</button>
                        <button id="formatMp3" class="px-3 py-1 text-xs font-bold rounded-md text-slate-400 hover:text-white transition-all">MP3</button>
                    </div>
                </div>
            </div>
        </header>

        <main class="grid lg:grid-cols-[300px_1fr] gap-6">
            <!-- Sidebar: Upload & Queue -->
            <aside class="flex flex-col gap-4">
                <div id="dropzone" class="border-2 border-dashed border-slate-600 rounded-2xl p-6 text-center cursor-pointer transition-all duration-200 hover:border-primary-500 hover:bg-slate-800/80 group">
                    <input type="file" id="fileInput" accept="audio/*" multiple class="hidden">
                    <i data-lucide="file-audio" class="w-8 h-8 mx-auto text-slate-400 group-hover:text-primary-500 transition-colors mb-2"></i>
                    <h3 class="font-semibold text-white text-sm">Add Audio Files</h3>
                    <p class="text-slate-500 text-xs mt-1">Drag & Drop or Click</p>
                </div>

                <div class="bg-slate-800 rounded-2xl border border-slate-700 flex-1 flex flex-col overflow-hidden max-h-[600px]">
                    <div class="p-4 border-b border-slate-700 flex justify-between items-center bg-slate-800/90">
                        <h3 class="font-semibold text-white flex items-center gap-2">
                            <i data-lucide="list-video" class="w-4 h-4"></i> Batch Queue
                        </h3>
                        <span id="queueCount" class="bg-slate-700 text-xs px-2 py-0.5 rounded-full text-slate-300">0 files</span>
                    </div>
                    <div id="fileList" class="overflow-y-auto flex-1 p-2 space-y-1">
                        <!-- Queue items render here -->
                        <div class="p-4 text-center text-slate-500 text-sm italic empty-state">Queue is empty.</div>
                    </div>
                    
                    <div class="p-4 border-t border-slate-700 bg-slate-800/90 space-y-3">
                        <button id="processBtn" disabled class="w-full flex items-center justify-center gap-2 bg-primary-600 disabled:bg-slate-700 disabled:text-slate-500 hover:bg-primary-500 text-white px-4 py-2.5 rounded-xl font-medium transition-all">
                            <i data-lucide="cpu" class="w-4 h-4"></i> Start Processing
                        </button>
                        <button id="downloadZipBtn" class="hidden w-full flex items-center justify-center gap-2 bg-emerald-600 hover:bg-emerald-500 text-white px-4 py-2.5 rounded-xl font-medium transition-all shadow-[0_0_15px_rgba(16,185,129,0.2)]">
                            <i data-lucide="archive" class="w-4 h-4"></i> Download ZIP
                        </button>
                    </div>
                </div>
            </aside>

            <!-- Main Workspace -->
            <section class="bg-slate-800 rounded-2xl border border-slate-700 flex flex-col overflow-hidden min-h-[400px]">
                
                <div id="workspaceEmpty" class="flex-1 flex flex-col items-center justify-center text-slate-500 p-10">
                    <i data-lucide="activity" class="w-16 h-16 text-slate-700 mb-4"></i>
                    <p class="text-lg">Select a file from the queue to edit</p>
                </div>

                <div id="workspaceActive" class="hidden flex-1 flex flex-col">
                    <!-- File Header -->
                    <div class="p-5 border-b border-slate-700 flex justify-between items-center bg-slate-900/40">
                        <h2 id="activeFileName" class="text-xl font-bold text-white truncate max-w-[60%]">filename.wav</h2>
                        
                        <!-- A/B Toggle -->
                        <div id="abToggleContainer" class="hidden bg-slate-900 p-1 rounded-lg border border-slate-700 flex items-center shadow-inner">
                            <button id="btnOriginal" class="px-4 py-1.5 text-xs font-bold rounded-md bg-slate-700 text-white transition-all shadow-sm">Original</button>
                            <button id="btnCleaned" class="px-4 py-1.5 text-xs font-bold rounded-md text-slate-400 hover:text-white transition-all">Cleaned</button>
                        </div>
                    </div>

                    <!-- Waveform Area -->
                    <div class="flex-1 flex flex-col justify-center p-6 bg-slate-900/20 relative">
                        <div id="waveform" class="w-full"></div>
                        <div id="timeDisplay" class="absolute bottom-4 right-6 text-xs font-mono text-slate-400 bg-slate-900/80 px-2 py-1 rounded">00:00 / 00:00</div>
                    </div>

                    <!-- Trimming & Controls -->
                    <div class="p-5 border-t border-slate-700 bg-slate-800/80">
                        
                        <div class="flex flex-col md:flex-row gap-6 items-center justify-between">
                            
                            <!-- Playback -->
                            <div class="flex items-center gap-3">
                                <button id="playBtn" class="w-12 h-12 flex items-center justify-center bg-primary-600 hover:bg-primary-500 text-white rounded-full transition-all shadow-lg hover:scale-105">
                                    <i data-lucide="play" id="playIcon" class="w-5 h-5 ml-1"></i>
                                </button>
                            </div>

                            <!-- Trimming -->
                            <div class="flex items-center gap-2 flex-1 max-w-xl">
                                <i data-lucide="scissors" class="w-4 h-4 text-slate-500"></i>
                                <div class="flex items-center gap-2 bg-slate-900 p-2 rounded-lg border border-slate-700 flex-1">
                                    <div class="flex-1 flex flex-col">
                                        <label class="text-[10px] text-slate-500 uppercase ml-1">Start (sec)</label>
                                        <div class="flex gap-1">
                                            <input type="number" id="trimStart" step="0.1" min="0" value="0.0" class="w-full bg-slate-800 text-white text-sm px-2 py-1 rounded border border-slate-600 focus:border-primary-500 outline-none font-mono">
                                            <button id="setStartBtn" title="Set to current playhead" class="px-2 bg-slate-700 hover:bg-slate-600 rounded text-slate-300"><i data-lucide="map-pin" class="w-3 h-3"></i></button>
                                        </div>
                                    </div>
                                    <div class="w-4 border-t border-slate-600"></div>
                                    <div class="flex-1 flex flex-col">
                                        <label class="text-[10px] text-slate-500 uppercase ml-1">End (sec)</label>
                                        <div class="flex gap-1">
                                            <input type="number" id="trimEnd" step="0.1" min="0" value="0.0" class="w-full bg-slate-800 text-white text-sm px-2 py-1 rounded border border-slate-600 focus:border-primary-500 outline-none font-mono">
                                            <button id="setEndBtn" title="Set to current playhead" class="px-2 bg-slate-700 hover:bg-slate-600 rounded text-slate-300"><i data-lucide="map-pin" class="w-3 h-3"></i></button>
                                        </div>
                                    </div>
                                </div>
                            </div>
                            
                            <!-- Download Single -->
                            <div>
                                <button id="downloadSingleBtn" class="hidden flex items-center gap-2 bg-slate-700 hover:bg-slate-600 text-white px-4 py-2 rounded-lg text-sm font-medium transition-all">
                                    <i data-lucide="download" class="w-4 h-4"></i> Save
                                </button>
                            </div>

                        </div>
                    </div>
                </div>

                <!-- Global Overlay for App Status -->
                <div id="globalStatus" class="hidden absolute inset-0 bg-slate-900/80 backdrop-blur-sm z-50 flex flex-col items-center justify-center rounded-2xl">
                    <i data-lucide="loader-2" class="w-12 h-12 text-primary-500 spinner mb-4"></i>
                    <h3 id="globalStatusTitle" class="text-xl font-bold text-white mb-2">Initializing AI Engine...</h3>
                    <p id="globalStatusDesc" class="text-slate-400 text-sm max-w-sm text-center">Loading DeepFilterNet WebAssembly core.</p>
                    
                    <div class="w-64 bg-slate-800 rounded-full h-2 mt-6 overflow-hidden border border-slate-700">
                        <div id="globalProgressBar" class="bg-primary-500 h-2 rounded-full transition-all duration-300" style="width: 0%"></div>
                    </div>
                </div>

            </section>
        </main>
    </div>

    <script type="module">
        import WaveSurfer from 'https://unpkg.com/wavesurfer.js@7/dist/wavesurfer.esm.js';

        // --- HUGGING FACE DIRECT FETCH INTERCEPTOR ---
        if (typeof window.SharedArrayBuffer === 'undefined') { window.SharedArrayBuffer = window.ArrayBuffer; }
        const originalFetch = window.fetch;
        window.fetch = async function(...args) {
            let request = args[0];
            let reqUrl = typeof request === 'string' ? request : (request && request.url);
            if (reqUrl && typeof reqUrl === 'string') {
                let newUrl = null;
                if (reqUrl.includes('df_bg.wasm')) newUrl = 'https://huggingface.co/trysem/DeepFilterNet3/resolve/main/df_bg.wasm';
                else if (reqUrl.includes('DeepFilterNet3_onnx.tar.gz')) newUrl = 'https://huggingface.co/trysem/DeepFilterNet3/resolve/main/DeepFilterNet3_onnx.tar.gz';
                if (newUrl) args[0] = request instanceof Request ? new Request(newUrl, request) : newUrl;
            }
            return originalFetch.apply(this, args);
        };

        // --- STATE MANAGEMENT ---
        const state = {
            files: [], // Array of objects: { id, file, name, originalUrl, cleanedUrl, status, duration, startTrim, endTrim }
            activeId: null,
            settings: { format: 'wav', normalize: true, noiseLevel: 100 },
            dfNetProc: null, // Holds the loaded AI processor
            wavesurfer: null,
            playbackMode: 'original' // 'original' or 'cleaned'
        };

        // --- UI BINDINGS ---
        lucide.createIcons();
        const UI = {
            dropzone: document.getElementById('dropzone'),
            fileInput: document.getElementById('fileInput'),
            fileList: document.getElementById('fileList'),
            queueCount: document.getElementById('queueCount'),
            processBtn: document.getElementById('processBtn'),
            downloadZipBtn: document.getElementById('downloadZipBtn'),
            workspaceEmpty: document.getElementById('workspaceEmpty'),
            workspaceActive: document.getElementById('workspaceActive'),
            activeFileName: document.getElementById('activeFileName'),
            playBtn: document.getElementById('playBtn'),
            playIcon: document.getElementById('playIcon'),
            timeDisplay: document.getElementById('timeDisplay'),
            trimStart: document.getElementById('trimStart'),
            trimEnd: document.getElementById('trimEnd'),
            abToggle: document.getElementById('abToggleContainer'),
            btnOriginal: document.getElementById('btnOriginal'),
            btnCleaned: document.getElementById('btnCleaned'),
            downloadSingleBtn: document.getElementById('downloadSingleBtn'),
            globalStatus: document.getElementById('globalStatus'),
            statusTitle: document.getElementById('globalStatusTitle'),
            statusDesc: document.getElementById('globalStatusDesc'),
            progressBar: document.getElementById('globalProgressBar')
        };

        // --- SETTINGS LOGIC ---
        document.getElementById('noiseLevel').addEventListener('input', (e) => {
            state.settings.noiseLevel = parseInt(e.target.value, 10);
            document.getElementById('noiseLevelValue').textContent = e.target.value;
        });
        document.getElementById('normalizeCheck').addEventListener('change', (e) => state.settings.normalize = e.target.checked);
        
        const formatWav = document.getElementById('formatWav');
        const formatMp3 = document.getElementById('formatMp3');
        formatWav.onclick = () => { state.settings.format = 'wav'; formatWav.className = 'px-3 py-1 text-xs font-bold rounded-md bg-primary-600 text-white transition-all'; formatMp3.className = 'px-3 py-1 text-xs font-bold rounded-md text-slate-400 hover:text-white transition-all'; };
        formatMp3.onclick = () => { state.settings.format = 'mp3'; formatMp3.className = 'px-3 py-1 text-xs font-bold rounded-md bg-primary-600 text-white transition-all'; formatWav.className = 'px-3 py-1 text-xs font-bold rounded-md text-slate-400 hover:text-white transition-all'; };

        // --- DRAG & DROP LOGIC ---
        ['dragenter', 'dragover', 'dragleave', 'drop'].forEach(e => UI.dropzone.addEventListener(e, ev => { ev.preventDefault(); ev.stopPropagation(); }, false));
        ['dragenter', 'dragover'].forEach(e => UI.dropzone.addEventListener(e, () => UI.dropzone.classList.add('drag-active'), false));
        ['dragleave', 'drop'].forEach(e => UI.dropzone.addEventListener(e, () => UI.dropzone.classList.remove('drag-active'), false));
        
        UI.dropzone.addEventListener('drop', (e) => handleFiles(e.dataTransfer.files));
        UI.dropzone.addEventListener('click', () => UI.fileInput.click());
        UI.fileInput.addEventListener('change', (e) => handleFiles(e.target.files));

        // --- FILE HANDLING & QUEUE ---
        function handleFiles(files) {
            let added = false;
            for (let f of files) {
                if (!f.type.startsWith('audio/')) continue;
                const id = 'f_' + Date.now() + Math.random().toString(36).substr(2, 5);
                state.files.push({
                    id, file: f, name: f.name, originalUrl: URL.createObjectURL(f),
                    cleanedUrl: null, status: 'pending', duration: 0, startTrim: 0, endTrim: 0
                });
                added = true;
            }
            if (added) {
                renderQueue();
                UI.processBtn.disabled = false;
                if (!state.activeId && state.files.length > 0) selectFile(state.files[0].id);
            }
        }

        function renderQueue() {
            UI.fileList.innerHTML = '';
            UI.queueCount.textContent = `${state.files.length} file${state.files.length !== 1 ? 's' : ''}`;
            if (state.files.length === 0) {
                UI.fileList.innerHTML = '<div class="p-4 text-center text-slate-500 text-sm italic empty-state">Queue is empty.</div>';
                UI.processBtn.disabled = true;
                return;
            }

            state.files.forEach(item => {
                const el = document.createElement('div');
                const isActive = item.id === state.activeId;
                
                let icon = '<i data-lucide="clock" class="w-4 h-4 text-slate-400"></i>';
                if(item.status === 'processing') icon = '<i data-lucide="loader-2" class="w-4 h-4 text-primary-500 spinner"></i>';
                if(item.status === 'done') icon = '<i data-lucide="check-circle-2" class="w-4 h-4 text-emerald-400"></i>';

                el.className = `p-3 rounded-lg flex items-center justify-between cursor-pointer border transition-all ${isActive ? 'bg-primary-900/20 border-primary-500/50' : 'bg-slate-900 border-slate-700 hover:border-slate-500'}`;
                el.innerHTML = `
                    <div class="flex items-center gap-3 overflow-hidden">
                        ${icon}
                        <span class="text-sm truncate text-slate-200 ${isActive ? 'font-semibold' : ''}">${item.name}</span>
                    </div>
                    <button class="p-1 text-slate-500 hover:text-red-400 remove-btn" data-id="${item.id}">
                        <i data-lucide="x" class="w-4 h-4"></i>
                    </button>
                `;
                el.onclick = (e) => { if(!e.target.closest('.remove-btn')) selectFile(item.id); };
                el.querySelector('.remove-btn').onclick = () => removeFile(item.id);
                UI.fileList.appendChild(el);
            });
            lucide.createIcons();
            
            // Show ZIP button if multiple done files exist
            const doneCount = state.files.filter(f => f.status === 'done').length;
            UI.downloadZipBtn.classList.toggle('hidden', doneCount < 1);
        }

        function removeFile(id) {
            state.files = state.files.filter(f => f.id !== id);
            if (state.activeId === id) {
                state.activeId = null;
                UI.workspaceActive.classList.add('hidden');
                UI.workspaceEmpty.classList.remove('hidden');
                if (state.wavesurfer) state.wavesurfer.destroy();
                state.wavesurfer = null;
            }
            renderQueue();
        }

        // --- WORKSPACE & WAVESURFER ---
        async function selectFile(id) {
            state.activeId = id;
            renderQueue();
            const item = state.files.find(f => f.id === id);
            
            UI.workspaceEmpty.classList.add('hidden');
            UI.workspaceActive.classList.remove('hidden');
            UI.activeFileName.textContent = item.name;

            // Setup A/B Toggle logic based on status
            if (item.status === 'done') {
                UI.abToggle.classList.remove('hidden');
                UI.downloadSingleBtn.classList.remove('hidden');
                setPlaybackMode('cleaned', item); // Default to listening to the cleaned version
            } else {
                UI.abToggle.classList.add('hidden');
                UI.downloadSingleBtn.classList.add('hidden');
                setPlaybackMode('original', item);
            }

            initWavesurfer(item);
        }

        function initWavesurfer(item) {
            if (state.wavesurfer) state.wavesurfer.destroy();
            
            state.wavesurfer = WaveSurfer.create({
                container: '#waveform',
                waveColor: '#475569',
                progressColor: '#3b82f6',
                cursorColor: '#60a5fa',
                barWidth: 2,
                barGap: 1,
                barRadius: 2,
                height: 120,
                normalize: true,
            });

            const loadUrl = state.playbackMode === 'cleaned' ? item.cleanedUrl : item.originalUrl;
            state.wavesurfer.load(loadUrl);

            state.wavesurfer.on('ready', () => {
                const duration = state.wavesurfer.getDuration();
                if (item.duration === 0) {
                    item.duration = duration;
                    item.endTrim = duration;
                }
                
                // Set Trim Inputs
                UI.trimStart.max = duration;
                UI.trimEnd.max = duration;
                UI.trimStart.value = item.startTrim.toFixed(1);
                UI.trimEnd.value = item.endTrim.toFixed(1);

                updateTimeDisplay();
                UI.playIcon.setAttribute('data-lucide', 'play');
                lucide.createIcons();
            });

            state.wavesurfer.on('audioprocess', updateTimeDisplay);
            state.wavesurfer.on('seek', updateTimeDisplay);
            state.wavesurfer.on('play', () => { UI.playIcon.setAttribute('data-lucide', 'pause'); lucide.createIcons(); });
            state.wavesurfer.on('pause', () => { UI.playIcon.setAttribute('data-lucide', 'play'); lucide.createIcons(); });
        }

        function updateTimeDisplay() {
            if(!state.wavesurfer) return;
            const cur = state.wavesurfer.getCurrentTime();
            const tot = state.wavesurfer.getDuration() || 0;
            UI.timeDisplay.textContent = `${formatTime(cur)} / ${formatTime(tot)}`;
            
            // Visual trim region indicator (hacky but works without extra plugins)
            const item = state.files.find(f => f.id === state.activeId);
            if(item && item.status === 'pending') {
               // Enforce playback bounds during preview
               if (cur > item.endTrim && state.wavesurfer.isPlaying()) {
                   state.wavesurfer.pause();
                   state.wavesurfer.setTime(item.startTrim);
               }
            }
        }

        function formatTime(sec) {
            const m = Math.floor(sec / 60);
            const s = Math.floor(sec % 60);
            return `${m.toString().padStart(2, '0')}:${s.toString().padStart(2, '0')}`;
        }

        // Workspace Controls Binding
        UI.playBtn.onclick = () => state.wavesurfer && state.wavesurfer.playPause();
        
        document.getElementById('setStartBtn').onclick = () => {
            if(!state.wavesurfer) return;
            const t = state.wavesurfer.getCurrentTime();
            UI.trimStart.value = t.toFixed(1);
            saveTrim();
        };
        document.getElementById('setEndBtn').onclick = () => {
            if(!state.wavesurfer) return;
            const t = state.wavesurfer.getCurrentTime();
            UI.trimEnd.value = t.toFixed(1);
            saveTrim();
        };
        UI.trimStart.onchange = saveTrim;
        UI.trimEnd.onchange = saveTrim;

        function saveTrim() {
            const item = state.files.find(f => f.id === state.activeId);
            if(!item || item.status !== 'pending') return; // Only allow trimming before processing
            let start = parseFloat(UI.trimStart.value) || 0;
            let end = parseFloat(UI.trimEnd.value) || item.duration;
            if(start < 0) start = 0;
            if(end > item.duration) end = item.duration;
            if(start >= end) start = end - 0.1;
            
            UI.trimStart.value = start.toFixed(1);
            UI.trimEnd.value = end.toFixed(1);
            item.startTrim = start;
            item.endTrim = end;
        }

        // A/B Toggle Logic
        UI.btnOriginal.onclick = () => setPlaybackMode('original', state.files.find(f=>f.id===state.activeId));
        UI.btnCleaned.onclick = () => setPlaybackMode('cleaned', state.files.find(f=>f.id===state.activeId));

        function setPlaybackMode(mode, item) {
            if (!item || !state.wavesurfer) return;
            state.playbackMode = mode;
            
            // UI Update
            if (mode === 'original') {
                UI.btnOriginal.className = 'px-4 py-1.5 text-xs font-bold rounded-md bg-slate-700 text-white transition-all shadow-sm';
                UI.btnCleaned.className = 'px-4 py-1.5 text-xs font-bold rounded-md text-slate-400 hover:text-white transition-all';
                state.wavesurfer.setOptions({ waveColor: '#475569', progressColor: '#94a3b8' });
            } else {
                UI.btnCleaned.className = 'px-4 py-1.5 text-xs font-bold rounded-md bg-primary-600 text-white transition-all shadow-sm';
                UI.btnOriginal.className = 'px-4 py-1.5 text-xs font-bold rounded-md text-slate-400 hover:text-white transition-all';
                state.wavesurfer.setOptions({ waveColor: '#1e3a8a', progressColor: '#3b82f6' });
            }

            // Swap Buffer seamlessly
            const curTime = state.wavesurfer.getCurrentTime();
            const wasPlaying = state.wavesurfer.isPlaying();
            
            state.wavesurfer.load(mode === 'cleaned' ? item.cleanedUrl : item.originalUrl).then(() => {
                state.wavesurfer.setTime(curTime);
                if(wasPlaying) state.wavesurfer.play();
            });
        }

        // --- PROCESSING ENGINE (THE HEAVY LIFTING) ---
        function setGlobalStatus(show, title='', desc='', progress=0) {
            if (!show) { UI.globalStatus.classList.add('hidden'); return; }
            UI.globalStatus.classList.remove('hidden');
            UI.statusTitle.textContent = title;
            UI.statusDesc.textContent = desc;
            UI.progressBar.style.width = `${progress}%`;
        }

        UI.processBtn.onclick = async () => {
            const pending = state.files.filter(f => f.status === 'pending');
            if (pending.length === 0) return;

            setGlobalStatus(true, "Initializing AI Engine...", "Loading DeepFilterNet WebAssembly core.", 10);

            try {
                // 1. Initialize DF Model ONCE
                if (!state.dfNetProc) {
                    const dfModule = await import('https://esm.sh/deepfilternet3-noise-filter@1.2.1');
                    const ProcessorClass = dfModule.DeepFilterNet3Core || dfModule.DeepFilterNoiseFilterProcessor;
                    
                    state.dfNetProc = new ProcessorClass({
                        sampleRate: 48000,
                        noiseReductionLevel: state.settings.noiseLevel,
                        assetConfig: { cdnUrl: 'https://huggingface.co/trysem/DeepFilterNet3/resolve/main' }
                    });
                    await state.dfNetProc.initialize();
                } else {
                    // Update noise level if changed
                    state.dfNetProc.noiseReductionLevel = state.settings.noiseLevel;
                }

                const audioCtx = new (window.AudioContext || window.webkitAudioContext)({ sampleRate: 48000 });

                // 2. Loop through pending queue
                for (let i = 0; i < pending.length; i++) {
                    const item = pending[i];
                    item.status = 'processing';
                    renderQueue();
                    
                    const p = 10 + Math.floor((i / pending.length) * 90);
                    setGlobalStatus(true, `Processing File ${i+1} of ${pending.length}`, `Cleaning: ${item.name}`, p);

                    // Decode
                    const arrayBuffer = await item.file.arrayBuffer();
                    let decodedBuffer = await audioCtx.decodeAudioData(arrayBuffer);

                    // Trimming Logic
                    if (item.endTrim > 0 && (item.startTrim > 0 || item.endTrim < decodedBuffer.duration)) {
                        const startSample = Math.floor(item.startTrim * 48000);
                        let endSample = Math.floor(item.endTrim * 48000);
                        if (endSample > decodedBuffer.length) endSample = decodedBuffer.length;
                        
                        const len = endSample - startSample;
                        const trimmed = new AudioContext({sampleRate:48000}).createBuffer(decodedBuffer.numberOfChannels, len, 48000);
                        for(let c=0; c<decodedBuffer.numberOfChannels; c++){
                            trimmed.copyToChannel(decodedBuffer.getChannelData(c).subarray(startSample, endSample), c);
                        }
                        decodedBuffer = trimmed;
                    }

                    // Run AI Model via OfflineContext
                    const offlineCtx = new OfflineAudioContext(1, decodedBuffer.length, 48000);
                    const sourceNode = offlineCtx.createBufferSource();
                    
                    // Mix to mono
                    if (decodedBuffer.numberOfChannels > 1) {
                        const mono = offlineCtx.createBuffer(1, decodedBuffer.length, 48000);
                        const data = mono.getChannelData(0), left = decodedBuffer.getChannelData(0), right = decodedBuffer.getChannelData(1);
                        for (let j = 0; j < decodedBuffer.length; j++) data[j] = (left[j] + right[j]) / 2;
                        sourceNode.buffer = mono;
                    } else {
                        sourceNode.buffer = decodedBuffer;
                    }

                    const dfNode = await state.dfNetProc.createAudioWorkletNode(offlineCtx);
                    sourceNode.connect(dfNode);
                    dfNode.connect(offlineCtx.destination);
                    sourceNode.start(0);

                    const renderedBuffer = await offlineCtx.startRendering();

                    // Auto-Normalize (Feature 7)
                    if (state.settings.normalize) {
                        const dat = renderedBuffer.getChannelData(0);
                        let max = 0;
                        for(let j=0; j<dat.length; j++) { if(Math.abs(dat[j]) > max) max = Math.abs(dat[j]); }
                        if (max > 0) {
                            const multiplier = 0.95 / max; // Target -0.5dB peak
                            for(let j=0; j<dat.length; j++) dat[j] *= multiplier;
                        }
                    }

                    // Encode and Save (WAV or MP3)
                    let outBlob;
                    if (state.settings.format === 'mp3') {
                        setGlobalStatus(true, `Encoding MP3...`, `Compressing: ${item.name}`, p+5);
                        outBlob = encodeToMP3(renderedBuffer);
                    } else {
                        outBlob = audioBufferToWav(renderedBuffer);
                    }

                    item.cleanedUrl = URL.createObjectURL(outBlob);
                    item.blob = outBlob;
                    item.status = 'done';
                    
                    // Force garbage collection of massive buffers
                    decodedBuffer = null; 
                }

                setGlobalStatus(false);
                renderQueue();
                
                // Refresh active view if processing is done
                if(state.activeId) selectFile(state.activeId);

            } catch (err) {
                console.error(err);
                alert("An error occurred during processing. Check console.");
                setGlobalStatus(false);
            }
        };

        // --- ENCODERS ---
        function audioBufferToWav(buffer) {
            const numOfChan = buffer.numberOfChannels, len = buffer.length * numOfChan * 2 + 44;
            const view = new DataView(new ArrayBuffer(len)), channels = [];
            let offset = 0, pos = 0;
            const setU16 = d => { view.setUint16(offset, d, true); offset += 2; };
            const setU32 = d => { view.setUint32(offset, d, true); offset += 4; };

            setU32(0x46464952); setU32(len - 8); setU32(0x45564157); setU32(0x20746d66); setU32(16); setU16(1); setU16(numOfChan);
            setU32(buffer.sampleRate); setU32(buffer.sampleRate * 2 * numOfChan); setU16(numOfChan * 2); setU16(16); setU32(0x61746164); setU32(len - pos - 4);
            
            for(let i=0; i<numOfChan; i++) channels.push(buffer.getChannelData(i));
            
            while(pos < buffer.length) {
                for(let i=0; i<numOfChan; i++) {
                    let s = Math.max(-1, Math.min(1, channels[i][pos]));
                    setU16(s < 0 ? s * 0x8000 : s * 0x7FFF);
                }
                pos++;
            }
            return new Blob([view.buffer], { type: "audio/wav" });
        }

        // Uses lamejs for fast client-side MP3 encoding
        function encodeToMP3(audioBuffer) {
            const encoder = new lamejs.Mp3Encoder(1, audioBuffer.sampleRate, 192); // Mono, 192kbps
            const samples = audioBuffer.getChannelData(0);
            const mp3Data = [];
            const blockSize = 1152; // Must be multiple of 576
            const int16Samples = new Int16Array(samples.length);
            
            for (let i = 0; i < samples.length; i++) {
                let s = Math.max(-1, Math.min(1, samples[i]));
                int16Samples[i] = s < 0 ? s * 0x8000 : s * 0x7FFF;
            }
            
            for (let i = 0; i < int16Samples.length; i += blockSize) {
                const chunk = int16Samples.subarray(i, i + blockSize);
                const buf = encoder.encodeBuffer(chunk);
                if (buf.length > 0) mp3Data.push(buf);
            }
            
            const flush = encoder.flush();
            if (flush.length > 0) mp3Data.push(flush);
            return new Blob(mp3Data, { type: 'audio/mp3' });
        }

        // --- DOWNLOAD ACTIONS ---
        UI.downloadSingleBtn.onclick = () => {
            const item = state.files.find(f => f.id === state.activeId);
            if(!item || !item.cleanedUrl) return;
            const ext = state.settings.format === 'mp3' ? '.mp3' : '.wav';
            const a = document.createElement('a');
            a.href = item.cleanedUrl;
            a.download = `Cleaned_${item.name.replace(/\.[^/.]+$/, "")}${ext}`;
            a.click();
        };

        UI.downloadZipBtn.onclick = async () => {
            const doneFiles = state.files.filter(f => f.status === 'done');
            if(doneFiles.length === 0) return;
            
            const zip = new JSZip();
            const ext = state.settings.format === 'mp3' ? '.mp3' : '.wav';
            
            doneFiles.forEach(f => {
                const safeName = `Cleaned_${f.name.replace(/\.[^/.]+$/, "")}${ext}`;
                zip.file(safeName, f.blob);
            });
            
            setGlobalStatus(true, "Zipping files...", "Compressing your audio batch");
            const content = await zip.generateAsync({type:"blob"});
            setGlobalStatus(false);
            
            const a = document.createElement('a');
            a.href = URL.createObjectURL(content);
            a.download = "DeepFilterNet_Batch.zip";
            a.click();
        };

    </script>
</body>
</html>