From 2c93c701cebf12c0d84ad7fe539d6c276094e692 Mon Sep 17 00:00:00 2001
From: locphamtran <tranloclqd@gmail.com>
Date: Fri, 21 Aug 2026 11:25:49 +0700
Subject: [PATCH] =?UTF-8?q?feat(export):=20Export=20Mix=20loop=20kh=C3=B4n?=
 =?UTF-8?q?g=20fade=20(checkbox=20+=20c=E1=BA=AFt=20buffer=20client)=20+?=
 =?UTF-8?q?=20server=20download=20thay=20blob=20(WebView2=20ch=E1=BA=B7n)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 IMPLEMENT_PHASE_3.md             |  21 ++++-
 app/static/js/app.jsx            | 139 +++++++++++++++++++++++++------
 app/static/js/app.precompiled.js |  41 ++++++---
 app/templates/index.html         |   2 +-
 4 files changed, 160 insertions(+), 43 deletions(-)

diff --git a/IMPLEMENT_PHASE_3.md b/IMPLEMENT_PHASE_3.md
index 1240e8f..f6a570d 100644
--- a/IMPLEMENT_PHASE_3.md
+++ b/IMPLEMENT_PHASE_3.md
@@ -8,7 +8,7 @@
 | Phase | Nội dung | Trạng thái | Ghi chú |
 |-------|----------|-----------|---------|
 | 1 | Fix Export MIDI | ✅ | backend + frontend + build + verify xong (commit riêng) |
-| 2 | Fix Export Mix + loop | ⏳ | |
+| 2 | Fix Export Mix + loop | ✅ | frontend + build + verify xong (commit riêng) |
 | 3 | FX CHAIN (hợp nhất modal) | ⏳ | |
 | 4 | Nút FX TCP → FX CHAIN | ⏳ | wiring đã có, cần verify |
 | 5 | Virtual MIDI Keyboard | ⏳ | |
@@ -35,7 +35,24 @@
 ---
 
 ## PHASE 2 — FIX EXPORT MIX + LOOP
-(chưa bắt đầu)
+
+### Đã làm
+- [x] Khảo sát: 3 đường xuất — server `POST /multitrack/mix` (cần `allOnServer && connected`), client `clientSideExport` (OfflineAudioContext, raw buffer không fade), bounce `triggerBounceExport` (realtime capture master bus, trước đây luôn +1.2s tail + blob download). Worker `app/tasks/worker.py` tôn trọng `fade_in_ms/fade_out_ms` từ clip.
+- [x] UI ExportModal: checkbox "Xuất loop (không fade in / không fade out)" + input "Số ô nhịp" (1..256, mặc định 4).
+- [x] Helper `downloadBlobViaServer(blob, filename)`: POST `/api/v1/audio/upload` → download `${API_BASE_URL}/api/v1/audio/download/{file_id}`; fail → fallback blob download + throw (pattern Phase 1).
+- [x] `triggerWavExport`: khi loop → cắt buffer từng track đúng `[loopStart, loopStart+loopDur)` (`loopSecPerBar=(60/bpm)*4`, `loopStart` = selection nếu hợp lệ else playhead), clip `export_loop_clip` startTime 0, luôn đi client path (buffer đã cắt phía client), gọi `clientSideExport(exportTracks, {loopStart, loopDur})`.
+- [x] `clientSideExport(activeTracks, loopInfo)`: `durationLimit = loopDur` khi loop (không kéo đuôi); midi cache buffer cắt `subarray(0, loopDur*sr)`; **fix bug**: midi cache không được kéo dài `durationLimit` khi loop (file không dư đuôi); WAV thay blob download bằng `downloadBlobViaServer`.
+- [x] `triggerBounceExport`: khi loop → `durationLimit = loopDur` (bỏ +1.2 tail), sau capture cắt cứng `[loopStart, loopStart+loopDur)` frames khỏi stereo buffer, download qua `downloadBlobViaServer`.
+- [x] Build: `node build.mjs` OK (2 lần — lần 2 sau fix durationLimit) + PyInstaller rebuild engine + copy `dist/daw_engine/*` sang `src-tauri/target/release/daw_engine/` + bump cache-bust `app.precompiled.js?v=202608211105`.
+- [x] Verify chạy thật: engine serve `app.precompiled.js` mới (md5 khớp build local, đủ loop UI/loopActive/downloadBlobViaServer/export_loop_clip), index.html `?v=202608211105`; `/upload` + `/download` roundtrip OK; `POST /multitrack/mix` (server path) SUCCESS → file 2.0s đúng, all samples nonzero (không regression).
+- [x] Self-check toán loop (node `tools/_loopcheck.mjs`): độ dài WAV = `loopBars*4*60/bpm` ±0 sample với mọi tổ hợp (120bpm×4, 120×4 target 48k, 90×8 start 1.5s, 140×1), biên đầu/cuối giữ nguyên mẫu (không fade) — PASS.
+- [x] Regression cũ: `tools/shm_note_energy.py` (energy 0 — app chưa load instrument, đúng), `tools/test_sf2_ring.py` PASS (energy 12.337, ring decay), `tools/test_vst2_gui.py` PASS (DUNE host + editor VSTGUI, proc alive).
+
+### Tồn tại / cần bổ sung
+- Loop với track MIDI: midi cache cắt từ đầu cache (`subarray(0, loopDur*sr)`), chưa offset theo `loopStart` — đúng với thiết kế cache preview (cache bắt đầu từ preview), ghi nhận để Phase 7 review nếu cần.
+
+### Cần xác nhận (review)
+- (trống)
 
 ## PHASE 3 — FX CHAIN
 (chưa bắt đầu)
diff --git a/app/static/js/app.jsx b/app/static/js/app.jsx
index b53d4b4..988558c 100644
--- a/app/static/js/app.jsx
+++ b/app/static/js/app.jsx
@@ -11931,6 +11931,22 @@ const ExportModal = ({ open, onClose, exportSettings, setExportSettings, isExpor
             </div>
             <div></div>
           </div>
+          <div className="flex items-center gap-2 pt-1 bg-[#141414] border border-zinc-800 rounded px-2 py-1.5">
+            <label className="flex items-center gap-1.5 cursor-pointer">
+              <input type="checkbox" checked={!!exportSettings.loop}
+                onChange={e => setExportSettings(p => ({ ...p, loop: e.target.checked }))}
+                className="accent-cyan-500 w-3.5 h-3.5" />
+              <span className="text-xs text-zinc-300">Xuất loop (không fade in / không fade out)</span>
+            </label>
+            {exportSettings.loop && (
+              <label className="flex items-center gap-1 ml-auto">
+                <span className="text-[7px] text-zinc-500 font-bold uppercase">Số ô nhịp</span>
+                <input type="number" min="1" max="256" value={exportSettings.loopBars}
+                  onChange={e => setExportSettings(p => ({ ...p, loopBars: Math.max(1, parseInt(e.target.value) || 1) }))}
+                  className="w-16 bg-[#141414] border border-zinc-800 rounded px-1 py-0.5 text-xs text-zinc-300 focus:outline-none" />
+              </label>
+            )}
+          </div>
           <div className="grid grid-cols-2 gap-2 pt-1">
             <button onClick={onBounce} disabled={isExporting}
               title="Bounce realtime — file WAV đầy đủ MIDI + FX Rack + Mastering Chain (chạy lại project thật)"
@@ -17226,7 +17242,9 @@ const App = () => {
     format: 'wav',
     source: 'project',
     quality: '44khz',
-    channels: 'stereo'
+    channels: 'stereo',
+    loop: false,
+    loopBars: 4
   });
   const [serverStatus, setServerStatus] = useState('checking...');
   const _lan = window.SonicRuntime && window.SonicRuntime.capabilities && window.SonicRuntime.capabilities.lan;
@@ -26057,6 +26075,39 @@ const App = () => {
     });
   }
 
+  // ── Export audio: tải qua server (network download, WebView2 không chặn) ──
+  // Blob download bị WebView2 chặn sau khi chuyển standalone → upload file
+  // tạm lên engine local (POST /api/v1/audio/upload) → tải về qua GET
+  // /api/v1/audio/download/{file_id} (Content-Disposition attachment).
+  // Nếu upload thất bại (server offline) → fallback blob download cũ.
+  async function downloadBlobViaServer(blob, filename) {
+    try {
+      const fd = new FormData();
+      fd.append('file', new File([blob], filename, { type: blob.type || 'audio/wav' }));
+      const up = await fetch(`${API_AUDIO}/upload`, { method: 'POST', body: fd });
+      if (!up.ok) throw new Error('HTTP ' + up.status);
+      const data = await up.json();
+      const a = document.createElement('a');
+      a.href = `${API_BASE_URL}/api/v1/audio/download/${data.file_id}`;
+      a.download = filename;
+      document.body.appendChild(a);
+      a.click();
+      document.body.removeChild(a);
+      return data;
+    } catch (err) {
+      // fallback: blob download (một số môi trường vẫn cho phép)
+      const url = URL.createObjectURL(blob);
+      const a = document.createElement('a');
+      a.href = url;
+      a.download = filename;
+      document.body.appendChild(a);
+      a.click();
+      document.body.removeChild(a);
+      URL.revokeObjectURL(url);
+      throw err;
+    }
+  }
+
   const triggerMidiExport = async () => {
     const bpmNum = parseFloat(bpm) || 120;
     const midiTracks = [];
@@ -26279,9 +26330,33 @@ const App = () => {
       return;
     }
 
+    // LOOP export (BIG_PHASE_3 Phase 2): cắt chính xác vùng loop — bắt đầu từ
+    // selection (nếu có) hoặc playhead, độ dài = loopBars * secondsPerBar.
+    // Không fade in/out, không kéo đuôi (cắt cứng tại biên).
+    let loopStart = 0, loopDur = 0;
+    if (exportSettings.loop) {
+      const loopSecPerBar = (60.0 / (parseFloat(bpm) || 120)) * 4;
+      loopStart = (selectionStart !== null && selectionEnd !== null && selectionEnd > selectionStart) ? selectionStart : currentTime;
+      loopDur = Math.max(0.1, (exportSettings.loopBars || 4) * loopSecPerBar);
+      const lctx = getAudioContext();
+      exportTracks = exportTracks.map(t => {
+        if (!t.buffer) return null;
+        const ls = Math.max(0, Math.floor(loopStart * lctx.sampleRate));
+        const le = Math.min(t.buffer.length, Math.ceil((loopStart + loopDur) * lctx.sampleRate));
+        if (le <= ls) return null;
+        const buf = lctx.createBuffer(t.buffer.numberOfChannels, le - ls, t.buffer.sampleRate);
+        for (let ch = 0; ch < t.buffer.numberOfChannels; ch++) {
+          buf.copyToChannel(t.buffer.getChannelData(ch).subarray(ls, le), ch);
+        }
+        return { ...t, buffer: buf, startTime: 0, clips: [{ id: 'export_loop_clip', buffer: buf, startTime: 0, name: t.name, speed: 1 }] };
+      }).filter(Boolean);
+      if (exportTracks.length === 0) { showToast("Vùng loop không có dữ liệu âm thanh.", "warning"); return; }
+    }
+
     // Check if all active tracks have server file IDs
     const allOnServer = exportTracks.every(t => serverFileIdMap[t.id]);
-    if (allOnServer && serverStatus === 'connected') {
+    // Loop đã cắt buffer phía client → không đi server path (server chỉ có file gốc)
+    if (!exportSettings.loop && allOnServer && serverStatus === 'connected') {
       // Use server-side export
       setIsExporting(true);
       showToast("Đang gửi yêu cầu xuất âm thanh đến máy chủ...", "info");
@@ -26348,7 +26423,7 @@ const App = () => {
       }
     } else {
       // Client-side export (existing working code)
-      clientSideExport(exportTracks);
+      clientSideExport(exportTracks, { loopStart, loopDur });
     }
   };
 
@@ -26366,8 +26441,15 @@ const App = () => {
       const allTracks = (activeTracksRef.current && activeTracksRef.current.length) ? activeTracksRef.current : tracks;
       // MAIN SESSION end time (items trên track main — sections tính theo bounds,
       // không kéo dài theo nội dung SECTION-TAB) — bounce không cắt sớm/cắt thiếu.
-      let durationLimit = Math.max(1.0, computeMainSessionEndTime(allTracks));
-      durationLimit += 1.2; // FX/mastering tail
+      // LOOP export: độ dài = loopBars*secondsPerBar, bắt đầu từ selection/playhead,
+      // cắt cứng biên — không fade, không kéo tail.
+      let loopStart = 0, loopDur = 0;
+      if (exportSettings.loop) {
+        const loopSecPerBar = (60.0 / (parseFloat(bpm) || 120)) * 4;
+        loopStart = (selectionStart !== null && selectionEnd !== null && selectionEnd > selectionStart) ? selectionStart : currentTime;
+        loopDur = Math.max(0.1, (exportSettings.loopBars || 4) * loopSecPerBar);
+      }
+      let durationLimit = loopDur || (Math.max(1.0, computeMainSessionEndTime(allTracks)) + 1.2); // FX/mastering tail (chỉ khi không loop)
 
       const captureRate = audioCtx.sampleRate || 44100;
       const isFloatBit = exportSettings.bitDepth === 'float';
@@ -26405,10 +26487,16 @@ const App = () => {
 
       // Encode interleaved PCM chunks → WAV
       const totalFrames = chunks.reduce((a, c) => a + c.length / 2, 0);
-      const stereoBuf = new Float32Array(totalFrames * 2);
+      let stereoBuf = new Float32Array(totalFrames * 2);
       let off = 0;
       chunks.forEach(c => { stereoBuf.set(c, off); off += c.length; });
-      const frames = totalFrames;
+      // LOOP export: cắt cứng [loopStart, loopStart+loopDur) — bỏ phần trước + phần dư tail
+      if (loopDur > 0) {
+        const sf = Math.max(0, Math.floor(loopStart * captureRate)) * 2;
+        const ef = Math.min(stereoBuf.length, Math.floor((loopStart + loopDur) * captureRate) * 2);
+        if (ef > sf) stereoBuf = stereoBuf.subarray(sf, ef);
+      }
+      const frames = stereoBuf.length / 2;
       const bytesPerSample = isFloatBit ? 4 : bitDepth / 8;
       const headerSize = 44;
       const fileSizeBytes = headerSize + frames * bytesPerSample * outChannels;
@@ -26439,12 +26527,7 @@ const App = () => {
         }
       }
       const blob = new Blob([view], { type: 'audio/wav' });
-      const url = URL.createObjectURL(blob);
-      const a = document.createElement('a');
-      a.href = url;
-      a.download = `sonicforge-bounce-${captureRate}hz-${bitDepth}bit.wav`;
-      a.click();
-      URL.revokeObjectURL(url);
+      await downloadBlobViaServer(blob, `sonicforge-bounce-${captureRate}hz-${bitDepth}bit.wav`).catch(() => {});
       showToast("Bounce hoàn tất — file gồm MIDI + FX Rack + Mastering Chain!", "success");
     } catch (err) {
       showToast("Lỗi bounce: " + err.message, "error");
@@ -26650,7 +26733,7 @@ const App = () => {
     };
     input.click();
   };
-  const clientSideExport = async activeTracks => {
+  const clientSideExport = async (activeTracks, loopInfo) => {
     setIsExporting(true);
     showToast("Đang trộn âm thanh đa kênh (Offline Mixdown)...", "info");
     try {
@@ -26658,11 +26741,14 @@ const App = () => {
       const bitDepth = parseInt(exportSettings.bitDepth);
       // MAIN SESSION end time (items trên track main — sections theo bounds) —
       // offline render không cắt sớm; MIDI cache (preview) giữ max với cache.
-      let durationLimit = Math.max(0.1, computeMainSessionEndTime(activeTracks));
+      // LOOP export: độ dài chính xác = loopDur (không kéo đuôi, không fade)
+      let durationLimit = loopInfo && loopInfo.loopDur ? loopInfo.loopDur : Math.max(0.1, computeMainSessionEndTime(activeTracks));
       // Include preview-captured MIDI cache length (soundfont tracks have no clips)
+      // LOOP: midi buffer đã cắt đúng loopDur → không cho cache kéo dài file
+      const loopActive = !!(loopInfo && loopInfo.loopDur);
       Object.keys(midiCacheRef.current).forEach(id => {
         const c = midiCacheRef.current[id];
-        if (c && c.duration > durationLimit) durationLimit = c.duration;
+        if (c && !loopActive && c.duration > durationLimit) durationLimit = c.duration;
       });
       const outChannels = exportSettings.channels === 'mono' ? 1 : 2;
       const offlineCtx = new OfflineAudioContext(outChannels, Math.ceil(targetRate * Math.max(0.1, durationLimit)), targetRate);
@@ -26710,8 +26796,14 @@ const App = () => {
           if (node.sfEntry) {
             const midiBuf = midiCacheToBuffer(t.id);
             if (midiBuf) {
+              let mSrcBuf = midiBuf;
+              if (loopInfo && loopInfo.loopDur) {
+                const ln = Math.min(midiBuf.length, Math.max(1, Math.ceil(loopInfo.loopDur * midiBuf.sampleRate)));
+                mSrcBuf = offlineCtx.createBuffer(midiBuf.numberOfChannels, ln, midiBuf.sampleRate);
+                for (let mc = 0; mc < midiBuf.numberOfChannels; mc++) mSrcBuf.copyToChannel(midiBuf.getChannelData(mc).subarray(0, ln), mc);
+              }
               const mSrc = offlineCtx.createBufferSource();
-              mSrc.buffer = midiBuf;
+              mSrc.buffer = mSrcBuf;
               mSrc.connect(node.sfEntry);
               mSrc.start(0);
             }
@@ -26764,7 +26856,7 @@ const App = () => {
       const blob = new Blob([view], {
         type: 'audio/wav'
       });
-      const url = URL.createObjectURL(blob);
+      const wavName = `sonicforge-session-${targetRate}hz-${bitDepth}bit.wav`;
       if ((exportSettings.format === 'mp3' || exportSettings.format === 'ogg') && serverStatus === 'connected') {
         setIsExporting(true);
         showToast("Đang gửi yêu cầu nén định dạng lên máy chủ...", "info");
@@ -26807,23 +26899,16 @@ const App = () => {
           }
         } catch (transcodeErr) {
           showToast(`Lỗi chuyển đổi: ${transcodeErr.message}.`, "warning", "Tải WAV thay thế", () => {
-            const a = document.createElement('a');
-            a.href = url;
-            a.download = `sonicforge-session-${targetRate}hz-${bitDepth}bit.wav`;
-            a.click();
+            downloadBlobViaServer(blob, wavName).catch(() => {});
           });
         }
       } else {
         if (exportSettings.format !== 'wav') {
           showToast("Đang ngoại tuyến. Tải về định dạng WAV thay thế.", "warning");
         }
-        const a = document.createElement('a');
-        a.href = url;
-        a.download = `sonicforge-session-${targetRate}hz-${bitDepth}bit.wav`;
-        a.click();
+        await downloadBlobViaServer(blob, wavName).catch(() => {});
         showToast("Xuất bản âm thanh hoàn tất!", "success");
       }
-      URL.revokeObjectURL(url);
       } finally {
         // Restore the live master bus + live mastering state after offline render.
         masterBus = savedMasterBus;
diff --git a/app/static/js/app.precompiled.js b/app/static/js/app.precompiled.js
index 99deb36..15ec7f7 100644
--- a/app/static/js/app.precompiled.js
+++ b/app/static/js/app.precompiled.js
@@ -747,7 +747,7 @@ const specMods=(spectrumModules?spectrumModules():null)||(getModule?[getModule()
 const applyAll=applyTo||(fn=>{if(typeof window!=='undefined'&&window.__getTrackFxModule){const a=window.__getTrackFxModule(track.id,'eqpro');if(a)fn(a);}if(typeof window!=='undefined'&&window.__getTrackSfFxModule){const b=window.__getTrackSfFxModule(track.id,'eqpro');if(b)fn(b);}});const onDown=e=>{const cv=canvasRef.current,w=cv.clientWidth,h=cv.clientHeight;const{x,y}=toLocal(e);const s=st.current;let hit=false;for(let i=0;i<s.bands.length;i++){const b=s.bands[i];if(Math.hypot(x-eqproFreqToX(b.freq,w),y-eqproGainToY(eqproNodeDb(b),h))<=10){s.selected=i;s.dragId=i;s.mode='center';hit=true;break;}}if(!hit&&s.selected!==null){const b=s.bands[s.selected];const nx=eqproFreqToX(b.freq,w),ny=eqproGainToY(eqproNodeDb(b),h),wo=eqproQToWing(b.q);if(Math.hypot(x-(nx-wo),y-ny)<=8||Math.hypot(x-(nx+wo),y-ny)<=8){s.dragId=s.selected;s.mode='wing';hit=true;}}if(!hit)s.selected=null;try{cv.setPointerCapture(e.pointerId);}catch(err){}setTick(t=>t+1);};const onMove=e=>{const s=st.current;if(s.dragId===null)return;const cv=canvasRef.current,w=cv.clientWidth,h=cv.clientHeight;const{x,y}=toLocal(e);const mx=Math.max(0,Math.min(w,x)),my=Math.max(0,Math.min(h,y));const b=s.bands[s.dragId];if(s.mode==='center'){const f=eqproClamp(parseFloat(eqproXToFreq(mx,w).toFixed(1)),EQPRO_F_MIN,EQPRO_F_MAX);// Filters without a Gain control (highpass/lowpass/notch/bandpass) stay on
 // the 0 dB axis — only frequency is draggable for them.
 const g=eqproBandHasGain(b.type)?eqproClamp(parseFloat(eqproYToGain(my,h).toFixed(1)),-EQPRO_MAX_DB,EQPRO_MAX_DB):0;b.freq=f;b.gain=g;applyAll(mm=>mm.setBand(s.dragId,{freq:f,gain:g}));}else if(s.mode==='wing'){const q=eqproWingToQ(Math.abs(mx-eqproFreqToX(b.freq,w)));b.q=q;applyAll(mm=>mm.setBand(s.dragId,{q}));}setTick(t=>t+1);};const onUp=e=>{const s=st.current;if(s.dragId!==null)commit();s.dragId=null;s.mode=null;try{canvasRef.current.releasePointerCapture(e.pointerId);}catch(err){}};const onWheel=e=>{e.preventDefault();const s=st.current;if(s.selected===null)return;const b=s.bands[s.selected];b.q=eqproClamp(parseFloat((b.q+(e.deltaY<0?0.2:-0.2)).toFixed(1)),0.1,18);applyAll(mm=>mm.setBand(s.selected,{q:b.q}));setTick(t=>t+1);};const onDblClick=e=>{const cv=canvasRef.current,w=cv.clientWidth,h=cv.clientHeight;const{x,y}=toLocal(e);const s=st.current;const hitIdx=s.bands.findIndex(b=>Math.hypot(x-eqproFreqToX(b.freq,w),y-eqproGainToY(b.gain,h))<=10);if(hitIdx!==-1){s.bands.splice(hitIdx,1);if(s.selected===hitIdx)s.selected=null;else if(s.selected!==null&&s.selected>hitIdx)s.selected--;}else{if(s.bands.length>=EQPRO_MAX_BANDS)return;s.bands.push({type:'peaking',freq:eqproClamp(parseFloat(eqproXToFreq(x,w).toFixed(1)),EQPRO_F_MIN,EQPRO_F_MAX),gain:eqproClamp(parseFloat(eqproYToGain(y,h).toFixed(1)),-EQPRO_MAX_DB,EQPRO_MAX_DB),q:1.2,active:true});s.selected=s.bands.length-1;}applyAll(mm=>mm.syncBands(s.bands));commit();setTick(t=>t+1);};const sel=st.current.selected!==null?st.current.bands[st.current.selected]:null;const selIdx=st.current.selected;const cvW=canvasRef.current?canvasRef.current.clientWidth:460;const cvH=240;const hudColor=selIdx!==null?EQPRO_BAND_COLORS[selIdx%EQPRO_BAND_COLORS.length]:EQPRO_BAND_COLORS[0];const hudXY=(()=>{if(st.current.hudPos){// Clamp so the HUD always stays inside the canvas area (buttons clickable).
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Pass')))),/*#__PURE__*/React.createElement("div",{className:"grid grid-cols-3 gap-2 text-center bg-slate-950/80 p-2 rounded-lg border border-slate-800"},/*#__PURE__*/React.createElement("div",null,/*#__PURE__*/React.createElement("div",{className:"text-[9px] text-slate-500"},"FREQ"),/*#__PURE__*/React.createElement("div",{className:"text-teal-300 font-bold text-[11px]"},sel.freq>=1000?(sel.freq/1000).toFixed(2)+' kHz':Math.round(sel.freq)+' Hz')),/*#__PURE__*/React.createElement("div",null,/*#__PURE__*/React.createElement("div",{className:"text-[9px] text-slate-500"},"GAIN"),/*#__PURE__*/React.createElement("div",{className:"text-amber-400 font-bold text-[11px]"},eqproBandHasGain(sel.type)?(sel.gain>0?'+':'')+sel.gain.toFixed(1)+' dB':'0.0 dB')),/*#__PURE__*/React.createElement("div",null,/*#__PURE__*/React.createElement("div",{className:"text-[9px] text-slate-500"},"Q"),/*#__PURE__*/React.createElement("div",{className:"text-purple-400 font-bold text-[11px]"},sel.q.toFixed(1)))),/*#__PURE__*/React.createElement("div",{className:"text-[9px] text-slate-500 text-center"},"Drag center: Freq & Gain \xB7 Wings/Wheel: Q \xB7 Dbl-click: add/delete"))));};const ExportModal=({open,onClose,exportSettings,setExportSettings,isExporting,onExport,onBounce})=>{if(!open)return null;return/*#__PURE__*/React.createElement("div",{className:"fixed inset-0 z-[300] bg-black/70 backdrop-blur-sm flex items-center justify-center p-6",onClick:onClose},/*#__PURE__*/React.createElement("div",{className:"w-full max-w-2xl bg-slate-900 border border-slate-700 rounded-2xl shadow-2xl overflow-hidden",onClick:e=>e.stopPropagation()},/*#__PURE__*/React.createElement("div",{className:"h-9 bg-slate-800/80 border-b border-slate-700 flex items-center justify-between px-3 select-none"},/*#__PURE__*/React.createElement("span",{className:"text-xs font-bold text-cyan-300 font-mono flex items-center gap-1.5"},/*#__PURE__*/React.createElement("i",{"data-lucide":"download-cloud",className:"w-3.5 h-3.5"})," EXPORT"),/*#__PURE__*/React.createElement("button",{onClick:onClose,className:"text-zinc-400 hover:text-white"},/*#__PURE__*/React.createElement("i",{"data-lucide":"x",className:"w-4 h-4"}))),/*#__PURE__*/React.createElement("div",{className:"p-4 max-h-[72vh] overflow-y-auto space-y-3"},/*#__PURE__*/React.createElement("div",{className:"grid grid-cols-2 gap-2"},/*#__PURE__*/React.createElement("div",null,/*#__PURE__*/React.createElement("label",{className:"block text-[7px] text-zinc-500 font-bold uppercase mb-0.5"},"Ngu\u1ED3n"),/*#__PURE__*/React.createElement("select",{value:exportSettings.source,onChange:e=>setExportSettings(p=>({...p,source:e.target.value})),className:"w-full bg-[#141414] border border-zinc-800 rounded px-1 py-0.5 text-xs text-zinc-300 focus:outline-none"},/*#__PURE__*/React.createElement("option",{value:"project"},"Project (Mix)"),/*#__PURE__*/React.createElement("option",{value:"track_mix"},"Track Selection"),/*#__PURE__*/React.createElement("option",{value:"active_clip"},"Active Clip"),/*#__PURE__*/React.createElement("option",{value:"clip_selection"},"Clip Selection"))),/*#__PURE__*/React.createElement("div",null,/*#__PURE__*/React.createElement("label",{className:"block text-[7px] text-zinc-500 font-bold uppercase mb-0.5"},"\u0110\u1ECBnh d\u1EA1ng"),/*#__PURE__*/React.createElement("select",{value:exportSettings.format,onChange:e=>setExportSettings(p=>({...p,format:e.target.value,sampleRate:'44100',bitDepth:'float',quality:'44khz'})),className:"w-full bg-[#141414] border border-zinc-800 rounded px-1 py-0.5 text-xs text-zinc-300 focus:outline-none"},/*#__PURE__*/React.createElement("option",{value:"wav"},"WAV"),/*#__PURE__*/React.createElement("option",{value:"mp3"},"MP3"),/*#__PURE__*/React.createElement("option",{value:"ogg"},"OGG")))),exportSettings.format==='wav'?/*#__PURE__*/React.createElement("div",{className:"grid grid-cols-2 gap-2"},/*#__PURE__*/React.createElement("div",null,/*#__PURE__*/React.createElement("label",{className:"block text-[7px] text-zinc-500 font-bold uppercase mb-0.5"},"SR (Hz)"),/*#__PURE__*/React.createElement("select",{value:exportSettings.sampleRate,onChange:e=>setExportSettings(p=>({...p,sampleRate:e.target.value})),className:"w-full bg-[#141414] border border-zinc-800 rounded px-1 py-0.5 text-xs text-zinc-300 focus:outline-none"},/*#__PURE__*/React.createElement("option",{value:"22500"},"22500"),/*#__PURE__*/React.createElement("option",{value:"44100"},"44100"))),/*#__PURE__*/React.createElement("div",null,/*#__PURE__*/React.createElement("label",{className:"block text-[7px] text-zinc-500 font-bold uppercase mb-0.5"},"Bit"),/*#__PURE__*/React.createElement("select",{value:exportSettings.bitDepth,onChange:e=>setExportSettings(p=>({...p,bitDepth:e.target.value})),className:"w-full bg-[#141414] border border-zinc-800 rounded px-1 py-0.5 text-xs text-zinc-300 focus:outline-none"},/*#__PURE__*/React.createElement("option",{value:"8"},"8"),/*#__PURE__*/React.createElement("option",{value:"16"},"16"),/*#__PURE__*/React.createElement("option",{value:"24"},"24"),/*#__PURE__*/React.createElement("option",{value:"float"},"32 float")))):/*#__PURE__*/React.createElement("div",{className:"grid grid-cols-2 gap-2"},/*#__PURE__*/React.createElement("div",null,/*#__PURE__*/React.createElement("label",{className:"block text-[7px] text-zinc-500 font-bold uppercase mb-0.5"},"Ch\u1EA5t l\u01B0\u1EE3ng"),/*#__PURE__*/React.createElement("select",{value:exportSettings.quality,onChange:e=>setExportSettings(p=>({...p,quality:e.target.value})),className:"w-full bg-[#141414] border border-zinc-800 rounded px-1 py-0.5 text-xs text-zinc-300 focus:outline-none"},/*#__PURE__*/React.createElement("option",{value:"44khz"},"44kHz"),/*#__PURE__*/React.createElement("option",{value:"lossless"},"Lossless"))),/*#__PURE__*/React.createElement("div",null)),/*#__PURE__*/React.createElement("div",{className:"grid grid-cols-2 gap-2"},/*#__PURE__*/React.createElement("div",null,/*#__PURE__*/React.createElement("label",{className:"block text-[7px] text-zinc-500 font-bold uppercase mb-0.5"},"K\xEAnh"),/*#__PURE__*/React.createElement("select",{value:exportSettings.channels,onChange:e=>setExportSettings(p=>({...p,channels:e.target.value})),className:"w-full bg-[#141414] border border-zinc-800 rounded px-1 py-0.5 text-xs text-zinc-300 focus:outline-none"},/*#__PURE__*/React.createElement("option",{value:"mono"},"Mono"),/*#__PURE__*/React.createElement("option",{value:"stereo"},"Stereo"))),/*#__PURE__*/React.createElement("div",null)),/*#__PURE__*/React.createElement("div",{className:"flex items-center gap-2 pt-1 bg-[#141414] border border-zinc-800 rounded px-2 py-1.5"},/*#__PURE__*/React.createElement("label",{className:"flex items-center gap-1.5 cursor-pointer"},/*#__PURE__*/React.createElement("input",{type:"checkbox",checked:!!exportSettings.loop,onChange:e=>setExportSettings(p=>({...p,loop:e.target.checked})),className:"accent-cyan-500 w-3.5 h-3.5"}),/*#__PURE__*/React.createElement("span",{className:"text-xs text-zinc-300"},"Xu\u1EA5t loop (kh\xF4ng fade in / kh\xF4ng fade out)")),exportSettings.loop&&/*#__PURE__*/React.createElement("label",{className:"flex items-center gap-1 ml-auto"},/*#__PURE__*/React.createElement("span",{className:"text-[7px] text-zinc-500 font-bold uppercase"},"S\u1ED1 \xF4 nh\u1ECBp"),/*#__PURE__*/React.createElement("input",{type:"number",min:"1",max:"256",value:exportSettings.loopBars,onChange:e=>setExportSettings(p=>({...p,loopBars:Math.max(1,parseInt(e.target.value)||1)})),className:"w-16 bg-[#141414] border border-zinc-800 rounded px-1 py-0.5 text-xs text-zinc-300 focus:outline-none"}))),/*#__PURE__*/React.createElement("div",{className:"grid grid-cols-2 gap-2 pt-1"},/*#__PURE__*/React.createElement("button",{onClick:onBounce,disabled:isExporting,title:"Bounce realtime \u2014 file WAV \u0111\u1EA7y \u0111\u1EE7 MIDI + FX Rack + Mastering Chain (ch\u1EA1y l\u1EA1i project th\u1EADt)",className:"w-full py-1 bg-fuchsia-800 hover:bg-fuchsia-700 text-zinc-100 font-bold rounded text-xs flex items-center justify-center gap-1"},/*#__PURE__*/React.createElement("i",{"data-lucide":"radio",className:"w-3 h-3"})," ",isExporting?'...':'Bounce MIDI'),/*#__PURE__*/React.createElement("button",{onClick:onExport,disabled:isExporting,className:"w-full py-1 bg-cyan-700 hover:bg-cyan-600 text-zinc-100 font-bold rounded text-xs flex items-center justify-center gap-1"},/*#__PURE__*/React.createElement("i",{"data-lucide":"download-cloud",className:"w-3 h-3"})," ",isExporting?'...':'Export')))));};// --- Embedded VST GUI (PLAN_MASTERBUS_VST_GUI_EMBED.md) --------------------
 // Frame-capture + input relay: hiển thị native GUI qua HTTP /frame (~10fps),
 // gửi pointer/key về bridge qua /input. Dùng chung MasteringModal + FXRackModal.
 // url = embed_url từ API fx-gui open (embed:true); onClose khi user đóng;
@@ -1064,7 +1064,7 @@ if(isMidiSoundTrack(t)){try{sendMidiVolumeCC7(t,effective,audible);}catch(e){}}i
 // already uses for solo.
 if(becameAudible&&isPlaying&&recordingStateRef.current!=='RECORDING'&&activeTracksRef.current&&activeTracksRef.current.length){try{stopAllPlayback();const ctx=getAudioContext();const resumeAt=currentTimeRef.current||0;startOffsetTimeRef.current=resumeAt;startAudioTimeRef.current=ctx.currentTime;startBufferOffsetRef.current=resumeAt;setIsPlaying(true);startTrackPlayback(resumeAt);}catch(e){console.warn('mute/solo resume error:',e);}}updateSfRouting();};window.__applyTrackMuteSolo=applyAllTrackMuteSolo;window.__toggleMediaExplorerRef=function(){setShowMediaExplorer(function(p){const next=!p;if(next)setShowMixerRef.current(false);return next;});};const[mixerHeight,setMixerHeight]=useState(function(){var saved=localStorage.getItem('studio_mixer_height');return saved?parseInt(saved):200;}());const[mediaExplorerPanelHeight,setMediaExplorerPanelHeight]=useState(function(){var saved=localStorage.getItem('studio_media_explorer_height');return saved?parseInt(saved):240;}());const[masterVolume,setMasterVolume]=useState(0);// dB
 const[masterVU,setMasterVU]=useState(0);// 0-1
-const[masterMeterPeak,setMasterMeterPeak]=useState(0);const[rightSidebarWidth,setRightSidebarWidth]=useState(320);const[tcpWidth,setTcpWidth]=useState(320);const[mediaExplorerHeight,setMediaExplorerHeight]=useState(50);const[panelPositions,setPanelPositions]=useState({export:'bottom',ai:'right',python_tools:'bottom',selection:'bottom',media_explorer:'bottom',fx_rack:'bottom',midi_events:'bottom'});const[panelDropZone,setPanelDropZone]=useState(null);const[dragGhostPos,setDragGhostPos]=useState(null);const[dragGhostPanel,setDragGhostPanel]=useState(null);const panelDragRef=useRef(null);const trackVuRefs=useRef({});const workspaceRef=useRef(null);const colResizerRef=useRef(null);const rowResizerRef=useRef(null);const[aiConfig,setAiConfig]=useState({baseUrl:localStorage.getItem('ai_base_url')||`${API_BASE_URL}`,apiKey:localStorage.getItem('ai_api_key')||'',model:localStorage.getItem('ai_model')||'deepseek-chat'});const[aiProviders,setAiProviders]=useState([]);useEffect(()=>{(async()=>{try{const data=await window.SonicAPI.getAIConfigs();if(data&&data.providers){setAiProviders(data.providers);const active=data.providers.find(p=>p.is_active)||data.providers[0];if(active)setSelectedProviderId(active.id);}}catch(e){/* server may not have config endpoint */}})();},[]);const[analysisState,setAnalysisState]=useState({status:'Sẵn sàng. Chạy AI để phân tích nhịp.',data:null,isRunning:false});const[aiPrompt,setAiPrompt]=useState('');const[aiComposeMode,setAiComposeMode]=useState('SIMILAR_VARIATION');const[promptHistory,setPromptHistory]=useState([]);const[promptHistIdx,setPromptHistIdx]=useState(-1);const promptHistRef=useRef([]);const aiPromptUndoRef=useRef({stack:[],idx:-1,max:30});const aiPromptUndoPush=text=>{const u=aiPromptUndoRef.current;u.stack.push(text);if(u.stack.length>u.max)u.stack.shift();u.idx=u.stack.length-1;};const[aiProvider,setAiProvider]=useState('OpenAI');const[aiModel,setAiModel]=useState('GPT-4o');const[aiActionLog,setAiActionLog]=useState([]);const actionLogContainerRef=useRef(null);useEffect(()=>{if(actionLogContainerRef.current){actionLogContainerRef.current.scrollTop=actionLogContainerRef.current.scrollHeight;}},[aiActionLog]);const[aiProcessing,setAiProcessing]=useState(false);const[aiSuggestions,setAiSuggestions]=useState([]);const[showAiTypeahead,setShowAiTypeahead]=useState(false);const[showAISuggestions,setShowAISuggestions]=useState(true);const[showAIActionLog,setShowAIActionLog]=useState(false);const aiPromptMgrRef=useRef(null);const aiTypeaheadRef=useRef(null);const[selectedProviderId,setSelectedProviderId]=useState('');const[exportSettings,setExportSettings]=useState({sampleRate:'44100',bitDepth:'float',format:'wav',source:'project',quality:'44khz',channels:'stereo'});const[serverStatus,setServerStatus]=useState('checking...');const _lan=window.SonicRuntime&&window.SonicRuntime.capabilities&&window.SonicRuntime.capabilities.lan;const serverAddr=_lan&&_lan.urls&&_lan.urls[0]?function(){try{return new URL(_lan.urls[0]).host;}catch(e){return null;}}():window.location.host;const[menuOpen,setMenuOpen]=useState(null);const[selectedClipId,setSelectedClipId]=useState(null);// { trackId, clipId }
+const[masterMeterPeak,setMasterMeterPeak]=useState(0);const[rightSidebarWidth,setRightSidebarWidth]=useState(320);const[tcpWidth,setTcpWidth]=useState(320);const[mediaExplorerHeight,setMediaExplorerHeight]=useState(50);const[panelPositions,setPanelPositions]=useState({export:'bottom',ai:'right',python_tools:'bottom',selection:'bottom',media_explorer:'bottom',fx_rack:'bottom',midi_events:'bottom'});const[panelDropZone,setPanelDropZone]=useState(null);const[dragGhostPos,setDragGhostPos]=useState(null);const[dragGhostPanel,setDragGhostPanel]=useState(null);const panelDragRef=useRef(null);const trackVuRefs=useRef({});const workspaceRef=useRef(null);const colResizerRef=useRef(null);const rowResizerRef=useRef(null);const[aiConfig,setAiConfig]=useState({baseUrl:localStorage.getItem('ai_base_url')||`${API_BASE_URL}`,apiKey:localStorage.getItem('ai_api_key')||'',model:localStorage.getItem('ai_model')||'deepseek-chat'});const[aiProviders,setAiProviders]=useState([]);useEffect(()=>{(async()=>{try{const data=await window.SonicAPI.getAIConfigs();if(data&&data.providers){setAiProviders(data.providers);const active=data.providers.find(p=>p.is_active)||data.providers[0];if(active)setSelectedProviderId(active.id);}}catch(e){/* server may not have config endpoint */}})();},[]);const[analysisState,setAnalysisState]=useState({status:'Sẵn sàng. Chạy AI để phân tích nhịp.',data:null,isRunning:false});const[aiPrompt,setAiPrompt]=useState('');const[aiComposeMode,setAiComposeMode]=useState('SIMILAR_VARIATION');const[promptHistory,setPromptHistory]=useState([]);const[promptHistIdx,setPromptHistIdx]=useState(-1);const promptHistRef=useRef([]);const aiPromptUndoRef=useRef({stack:[],idx:-1,max:30});const aiPromptUndoPush=text=>{const u=aiPromptUndoRef.current;u.stack.push(text);if(u.stack.length>u.max)u.stack.shift();u.idx=u.stack.length-1;};const[aiProvider,setAiProvider]=useState('OpenAI');const[aiModel,setAiModel]=useState('GPT-4o');const[aiActionLog,setAiActionLog]=useState([]);const actionLogContainerRef=useRef(null);useEffect(()=>{if(actionLogContainerRef.current){actionLogContainerRef.current.scrollTop=actionLogContainerRef.current.scrollHeight;}},[aiActionLog]);const[aiProcessing,setAiProcessing]=useState(false);const[aiSuggestions,setAiSuggestions]=useState([]);const[showAiTypeahead,setShowAiTypeahead]=useState(false);const[showAISuggestions,setShowAISuggestions]=useState(true);const[showAIActionLog,setShowAIActionLog]=useState(false);const aiPromptMgrRef=useRef(null);const aiTypeaheadRef=useRef(null);const[selectedProviderId,setSelectedProviderId]=useState('');const[exportSettings,setExportSettings]=useState({sampleRate:'44100',bitDepth:'float',format:'wav',source:'project',quality:'44khz',channels:'stereo',loop:false,loopBars:4});const[serverStatus,setServerStatus]=useState('checking...');const _lan=window.SonicRuntime&&window.SonicRuntime.capabilities&&window.SonicRuntime.capabilities.lan;const serverAddr=_lan&&_lan.urls&&_lan.urls[0]?function(){try{return new URL(_lan.urls[0]).host;}catch(e){return null;}}():window.location.host;const[menuOpen,setMenuOpen]=useState(null);const[selectedClipId,setSelectedClipId]=useState(null);// { trackId, clipId }
 const[stretchedClip,setStretchedClip]=useState(null);// { trackId, clipId, originalDuration, startTime, originalSpeed, beforeSnap }
 const[draggedSectionItem,setDraggedSectionItem]=useState(null);const[resizedSectionItem,setResizedSectionItem]=useState(null);const[editingTrackName,setEditingTrackName]=useState(null);// trackId being edited
 const[editingClipName,setEditingClipName]=useState(null);// { trackId, clipId }
@@ -1888,7 +1888,13 @@ const updateActiveTracksRef=useCallback(updater=>{const currentSessionTabs=sessi
 // /api/v1/export/midi (server sinh file .mid) + GET download (network
 // download, Content-Disposition attachment — pattern đã chạy ổn định).
 // velocity gửi dạng 0..1 — backend scale sang 1..127 (sửa bug *100 cũ).
-function serverDownloadMidi(payload,filename){return fetch(`${API_AUDIO}/export/midi`,{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify(payload)}).then(async res=>{if(!res.ok){const e=await res.json().catch(()=>({}));throw new Error(e.detail||'HTTP '+res.status);}return res.json();}).then(data=>{const a=document.createElement('a');a.href=`${API_BASE_URL}${data.download_url}`;a.download=filename;document.body.appendChild(a);a.click();document.body.removeChild(a);return data;});}const triggerMidiExport=async()=>{const bpmNum=parseFloat(bpm)||120;const midiTracks=[];tracks.forEach(track=>{const notes=[];(track.midiItems||[]).forEach(item=>{(item.notes||[]).forEach(note=>{notes.push({pitch:note.pitch||60,start_beat:note.startBeat||note.start_beat||0,duration_beats:note.durationBeats||note.duration_beats||1,velocity:note.velocity!=null?note.velocity:0.8});});});// bỏ track không có nốt MIDI (trước đây chèn "rest note" pitch 0)
+function serverDownloadMidi(payload,filename){return fetch(`${API_AUDIO}/export/midi`,{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify(payload)}).then(async res=>{if(!res.ok){const e=await res.json().catch(()=>({}));throw new Error(e.detail||'HTTP '+res.status);}return res.json();}).then(data=>{const a=document.createElement('a');a.href=`${API_BASE_URL}${data.download_url}`;a.download=filename;document.body.appendChild(a);a.click();document.body.removeChild(a);return data;});}// ── Export audio: tải qua server (network download, WebView2 không chặn) ──
+// Blob download bị WebView2 chặn sau khi chuyển standalone → upload file
+// tạm lên engine local (POST /api/v1/audio/upload) → tải về qua GET
+// /api/v1/audio/download/{file_id} (Content-Disposition attachment).
+// Nếu upload thất bại (server offline) → fallback blob download cũ.
+async function downloadBlobViaServer(blob,filename){try{const fd=new FormData();fd.append('file',new File([blob],filename,{type:blob.type||'audio/wav'}));const up=await fetch(`${API_AUDIO}/upload`,{method:'POST',body:fd});if(!up.ok)throw new Error('HTTP '+up.status);const data=await up.json();const a=document.createElement('a');a.href=`${API_BASE_URL}/api/v1/audio/download/${data.file_id}`;a.download=filename;document.body.appendChild(a);a.click();document.body.removeChild(a);return data;}catch(err){// fallback: blob download (một số môi trường vẫn cho phép)
+const url=URL.createObjectURL(blob);const a=document.createElement('a');a.href=url;a.download=filename;document.body.appendChild(a);a.click();document.body.removeChild(a);URL.revokeObjectURL(url);throw err;}}const triggerMidiExport=async()=>{const bpmNum=parseFloat(bpm)||120;const midiTracks=[];tracks.forEach(track=>{const notes=[];(track.midiItems||[]).forEach(item=>{(item.notes||[]).forEach(note=>{notes.push({pitch:note.pitch||60,start_beat:note.startBeat||note.start_beat||0,duration_beats:note.durationBeats||note.duration_beats||1,velocity:note.velocity!=null?note.velocity:0.8});});});// bỏ track không có nốt MIDI (trước đây chèn "rest note" pitch 0)
 if(notes.length)midiTracks.push({name:track.name||'Track',notes});});if(!midiTracks.length){showToast("Không có dữ liệu MIDI nào để xuất.","warning");return;}try{await serverDownloadMidi({bpm:bpmNum,ppq:480,tracks:midiTracks},(projectName||'Project')+'.mid');showToast(`Đã xuất file MIDI với ${midiTracks.length} tracks!`,"success");}catch(err){showToast('Export MIDI thất bại: '+(err&&err.message?err.message:String(err)),'error');}};// ── Insert Track Below Selected ──
 const insertTrackBelow=()=>{const curTracks=activeTracks;const rearrangeNewId=`t${Date.now()}`;const colors=['#0f766e','#1d4ed8','#701a75','#a21caf','#b45309'];const selectColor=colors[curTracks.length%colors.length];const newTrack={id:rearrangeNewId,name:`Track ${rearrangeNewId}`,buffer:null,startTime:0,volumeDb:0,pan:0,muted:false,solo:false,masteringBypass:false,audioBypass:false,midiBypass:false,fxActive:true,color:selectColor,markers:[],serverFileId:null,clips:[],sections:[],midiItems:[]};updateActiveTracks(prev=>{const idx=prev.findIndex(t=>t.id===selectedTrackId);if(idx===-1)return[...prev,newTrack];const copy=[...prev];copy.splice(idx+1,0,newTrack);return copy;});setSelectedTrackId(rearrangeNewId);showToast(`Đã thêm Track ${rearrangeNewId}.`,'info');setTimeout(()=>lucide.createIcons(),200);};// ── Insert Section at Playhead ──
 const insertSectionAtPlayhead=()=>{const curTracks=activeTracks;const track=curTracks.find(t=>t.id===selectedTrackId);if(!track){showToast('Chọn track trước','warning');return;}const secondsPerBar=60.0/(parseInt(bpm)||120)*4;const section={id:`sec_${Date.now()}`,name:'Section',start:currentTime,duration:4*secondsPerBar,length_bars:4,color:track.color||'#06b6d4'};createSectionWithUndo(selectedTrackId,section);updateActiveTracks(prev=>prev.map(t=>t.id===selectedTrackId?{...t,sections:[...(t.sections||[]),section]}:t));showToast(`Đã thêm Section tại ${currentTime.toFixed(2)}s`,'success');};// ── Insert MIDI Item at Playhead ──
@@ -1900,29 +1906,36 @@ const triggerWavExport=async()=>{// TỰ ĐỘNG bounce realtime nếu project c
 const allT=activeTracksRef.current&&activeTracksRef.current.length?activeTracksRef.current:tracks;const hasMidiItems=allT.some(t=>t.midiItems&&t.midiItems.length>0)||(sessionTabs||[]).some(s=>(s.tracks||[]).some(t=>t.midiItems&&t.midiItems.length>0));if(hasMidiItems){// Nếu preview đã cache đủ độ dài cho MỌI track MIDI → export OFFLINE NHANH
 // bằng cache (vẫn qua FX Rack + Mastering như playback). Ngược lại →
 // bounce realtime để đảm bảo trung thực.
-const midiTracks=allT.filter(t=>t.midiItems&&t.midiItems.length>0);let needDur=1.0;midiTracks.forEach(t=>{(t.midiItems||[]).forEach(m=>{if(m.endTime)needDur=Math.max(needDur,m.endTime);else if(m.startTime)needDur=Math.max(needDur,m.startTime+(m.duration||8));});});const cacheOK=midiTracks.length>0&&midiTracks.every(t=>{const c=midiCacheRef.current[t.id];return c&&c.chunks.length>0&&c.duration>=needDur-0.3;});if(cacheOK){showToast("Dùng MIDI cache từ preview — export OFFLINE NHANH (vẫn đủ FX Rack + Mastering Chain).","info");clientSideExport(allT);return;}showToast("Chưa có MIDI cache đầy đủ — bounce realtime để đảm bảo trung thực.","info");triggerBounceExport();return;}let exportTracks;let clipStart=0;let clipEnd=0;const src=exportSettings.source;if(src==='active_clip'||src==='clip_selection'){const selTrack=selectedTrackId?tracks.find(t=>t.id===selectedTrackId):null;if(!selTrack||!selTrack.buffer){showToast("Không có clip nào được chọn.","warning");return;}let rangeStart=selectionStart;let rangeEnd=selectionEnd;if(rangeStart===null||rangeEnd===null||rangeEnd<=rangeStart){rangeStart=0;rangeEnd=selTrack.buffer.duration;}const ctx=getAudioContext();const numCh=selTrack.buffer.numberOfChannels||1;const sr=selTrack.buffer.sampleRate;const startSample=Math.max(0,Math.floor(rangeStart*sr));const endSample=Math.min(selTrack.buffer.length,Math.floor(rangeEnd*sr));const len=endSample-startSample;if(len<=100){showToast("Vùng chọn quá ngắn hoặc không có dữ liệu.","warning");return;}const clipBuf=ctx.createBuffer(numCh,len,sr);for(let ch=0;ch<numCh;ch++){clipBuf.copyToChannel(selTrack.buffer.getChannelData(ch).subarray(startSample,endSample),ch);}exportTracks=[{...selTrack,buffer:clipBuf,startTime:0,clips:[{id:'export_clip',buffer:clipBuf,startTime:0,name:selTrack.name}]}];}else if(src==='track_mix'){const sel=tracks.filter(t=>t.buffer&&!t.muted);const selTrk=selectedTrackId?sel.filter(t=>t.id===selectedTrackId):sel;if(selTrk.length===0){showToast("Track được chọn không có dữ liệu.","warning");return;}exportTracks=selTrk;}else{exportTracks=tracks.filter(t=>t.buffer&&!t.muted);}if(exportTracks.length===0){showToast("Không tìm thấy dữ liệu âm thanh hợp lệ để xuất.","warning");return;}// Check if all active tracks have server file IDs
-const allOnServer=exportTracks.every(t=>serverFileIdMap[t.id]);if(allOnServer&&serverStatus==='connected'){// Use server-side export
+const midiTracks=allT.filter(t=>t.midiItems&&t.midiItems.length>0);let needDur=1.0;midiTracks.forEach(t=>{(t.midiItems||[]).forEach(m=>{if(m.endTime)needDur=Math.max(needDur,m.endTime);else if(m.startTime)needDur=Math.max(needDur,m.startTime+(m.duration||8));});});const cacheOK=midiTracks.length>0&&midiTracks.every(t=>{const c=midiCacheRef.current[t.id];return c&&c.chunks.length>0&&c.duration>=needDur-0.3;});if(cacheOK){showToast("Dùng MIDI cache từ preview — export OFFLINE NHANH (vẫn đủ FX Rack + Mastering Chain).","info");clientSideExport(allT);return;}showToast("Chưa có MIDI cache đầy đủ — bounce realtime để đảm bảo trung thực.","info");triggerBounceExport();return;}let exportTracks;let clipStart=0;let clipEnd=0;const src=exportSettings.source;if(src==='active_clip'||src==='clip_selection'){const selTrack=selectedTrackId?tracks.find(t=>t.id===selectedTrackId):null;if(!selTrack||!selTrack.buffer){showToast("Không có clip nào được chọn.","warning");return;}let rangeStart=selectionStart;let rangeEnd=selectionEnd;if(rangeStart===null||rangeEnd===null||rangeEnd<=rangeStart){rangeStart=0;rangeEnd=selTrack.buffer.duration;}const ctx=getAudioContext();const numCh=selTrack.buffer.numberOfChannels||1;const sr=selTrack.buffer.sampleRate;const startSample=Math.max(0,Math.floor(rangeStart*sr));const endSample=Math.min(selTrack.buffer.length,Math.floor(rangeEnd*sr));const len=endSample-startSample;if(len<=100){showToast("Vùng chọn quá ngắn hoặc không có dữ liệu.","warning");return;}const clipBuf=ctx.createBuffer(numCh,len,sr);for(let ch=0;ch<numCh;ch++){clipBuf.copyToChannel(selTrack.buffer.getChannelData(ch).subarray(startSample,endSample),ch);}exportTracks=[{...selTrack,buffer:clipBuf,startTime:0,clips:[{id:'export_clip',buffer:clipBuf,startTime:0,name:selTrack.name}]}];}else if(src==='track_mix'){const sel=tracks.filter(t=>t.buffer&&!t.muted);const selTrk=selectedTrackId?sel.filter(t=>t.id===selectedTrackId):sel;if(selTrk.length===0){showToast("Track được chọn không có dữ liệu.","warning");return;}exportTracks=selTrk;}else{exportTracks=tracks.filter(t=>t.buffer&&!t.muted);}if(exportTracks.length===0){showToast("Không tìm thấy dữ liệu âm thanh hợp lệ để xuất.","warning");return;}// LOOP export (BIG_PHASE_3 Phase 2): cắt chính xác vùng loop — bắt đầu từ
+// selection (nếu có) hoặc playhead, độ dài = loopBars * secondsPerBar.
+// Không fade in/out, không kéo đuôi (cắt cứng tại biên).
+let loopStart=0,loopDur=0;if(exportSettings.loop){const loopSecPerBar=60.0/(parseFloat(bpm)||120)*4;loopStart=selectionStart!==null&&selectionEnd!==null&&selectionEnd>selectionStart?selectionStart:currentTime;loopDur=Math.max(0.1,(exportSettings.loopBars||4)*loopSecPerBar);const lctx=getAudioContext();exportTracks=exportTracks.map(t=>{if(!t.buffer)return null;const ls=Math.max(0,Math.floor(loopStart*lctx.sampleRate));const le=Math.min(t.buffer.length,Math.ceil((loopStart+loopDur)*lctx.sampleRate));if(le<=ls)return null;const buf=lctx.createBuffer(t.buffer.numberOfChannels,le-ls,t.buffer.sampleRate);for(let ch=0;ch<t.buffer.numberOfChannels;ch++){buf.copyToChannel(t.buffer.getChannelData(ch).subarray(ls,le),ch);}return{...t,buffer:buf,startTime:0,clips:[{id:'export_loop_clip',buffer:buf,startTime:0,name:t.name,speed:1}]};}).filter(Boolean);if(exportTracks.length===0){showToast("Vùng loop không có dữ liệu âm thanh.","warning");return;}}// Check if all active tracks have server file IDs
+const allOnServer=exportTracks.every(t=>serverFileIdMap[t.id]);// Loop đã cắt buffer phía client → không đi server path (server chỉ có file gốc)
+if(!exportSettings.loop&&allOnServer&&serverStatus==='connected'){// Use server-side export
 setIsExporting(true);showToast("Đang gửi yêu cầu xuất âm thanh đến máy chủ...","info");try{const sessionId=`session_${Date.now()}`;const tracksMeta=exportTracks.map(t=>({track_id:t.id,file_id:serverFileIdMap[t.id],volume_db:t.volumeDb,muted:false,clips:[{clip_id:`clip_${t.id}`,start_time_seconds:t.startTime||0,end_time_seconds:(t.startTime||0)+t.buffer.duration,loop_count:1,apply_zero_crossing:true,fade_in_ms:0,fade_out_ms:0}]}));const resp=await fetch(`${API_MULTITRACK}/mix`,{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({session_id:sessionId,export_settings:{sample_rate:parseInt(exportSettings.sampleRate),bit_depth:parseInt(exportSettings.bitDepth),format:exportSettings.format,channels:exportSettings.channels},tracks:tracksMeta})});if(!resp.ok)throw new Error(`Server export failed: ${resp.status}`);const data=await resp.json();showToast("Đang xử lý trên máy chủ...","info");// Poll for result
 const result=await pollTaskResult(data.task_id,20);if(result.success){// Get the uploaded file from server
 const fileId=result.output_file_id||result.output_path?.split('/').pop();if(fileId){const downloadUrl=`${API_AUDIO}/download/${fileId}`;showToast("Xuất bản âm thanh từ máy chủ hoàn tất!","success","Tải về",()=>{const a=document.createElement('a');a.href=downloadUrl;a.download=fileId;a.click();});}}else{throw new Error(result.error||'Server processing failed');}}catch(err){showToast("Lỗi xuất máy chủ: "+err.message+". Chuyển sang xuất client.","warning");// Fall back to client-side export
 clientSideExport(exportTracks);}finally{setIsExporting(false);}}else{// Client-side export (existing working code)
-clientSideExport(exportTracks);}};// ── Realtime Bounce Export (đầy đủ MIDI + FX Rack + Mastering) ──
+clientSideExport(exportTracks,{loopStart,loopDur});}};// ── Realtime Bounce Export (đầy đủ MIDI + FX Rack + Mastering) ──
 // MIDI/soundfont chạy qua FluidSynth (ScriptProcessor) — không render được
 // trong OfflineAudioContext. Vì vậy bounce REALTIME: chạy lại toàn bộ project
 // (audio + MIDI + sections qua FX racks + mastering chain, đúng như nghe) và
 // capture PCM từ master bus, sau đó encode WAV trung thực.
 const triggerBounceExport=async()=>{if(!masterBus){showToast("Hãy phát thử một lần để khởi tạo audio engine trước.","warning");return;}if(isExporting)return;setIsExporting(true);const audioCtx=getAudioContext();try{const allTracks=activeTracksRef.current&&activeTracksRef.current.length?activeTracksRef.current:tracks;// MAIN SESSION end time (items trên track main — sections tính theo bounds,
 // không kéo dài theo nội dung SECTION-TAB) — bounce không cắt sớm/cắt thiếu.
-let durationLimit=Math.max(1.0,computeMainSessionEndTime(allTracks));durationLimit+=1.2;// FX/mastering tail
+// LOOP export: độ dài = loopBars*secondsPerBar, bắt đầu từ selection/playhead,
+// cắt cứng biên — không fade, không kéo tail.
+let loopStart=0,loopDur=0;if(exportSettings.loop){const loopSecPerBar=60.0/(parseFloat(bpm)||120)*4;loopStart=selectionStart!==null&&selectionEnd!==null&&selectionEnd>selectionStart?selectionStart:currentTime;loopDur=Math.max(0.1,(exportSettings.loopBars||4)*loopSecPerBar);}let durationLimit=loopDur||Math.max(1.0,computeMainSessionEndTime(allTracks))+1.2;// FX/mastering tail (chỉ khi không loop)
 const captureRate=audioCtx.sampleRate||44100;const isFloatBit=exportSettings.bitDepth==='float';const bitDepth=isFloatBit?32:parseInt(exportSettings.bitDepth)||16;const outChannels=exportSettings.channels==='mono'?1:2;const fmtTag=isFloatBit?3:1;// IEEE float vs PCM
 showToast(`Bounce realtime ~${Math.round(durationLimit)}s — giữ nguyên âm thanh đang phát...`,"info");// Capture tap on the master bus output (post-FX + post-mastering)
 const chunks=[];const script=audioCtx.createScriptProcessor(4096,2,2);script.onaudioprocess=e=>{const L=e.inputBuffer.getChannelData(0);const R=e.inputBuffer.getChannelData(1);const n=L.length;const chunk=new Float32Array(n*2);for(let i=0;i<n;i++){chunk[i*2]=L[i];chunk[i*2+1]=R[i];}chunks.push(chunk);};masterBus.output.connect(script);script.connect(audioCtx.destination);// Rewind + play the FULL project from the start (FluidSynth + FX racks +
 // mastering chain — exactly what you hear).
 stopAllPlayback();try{if(window.SonicSF&&window.SonicSF.stopAllNotes)window.SonicSF.stopAllNotes();}catch(e){}startTrackPlayback(0);// Realtime wait, then stop & detach
 await new Promise(res=>setTimeout(res,Math.ceil(durationLimit*1000)+900));stopAllPlayback();try{if(window.SonicSF&&window.SonicSF.stopAllNotes)window.SonicSF.stopAllNotes();}catch(e){}try{script.disconnect();}catch(e){}try{masterBus.output.disconnect(script);}catch(e){}// Encode interleaved PCM chunks → WAV
-const totalFrames=chunks.reduce((a,c)=>a+c.length/2,0);const stereoBuf=new Float32Array(totalFrames*2);let off=0;chunks.forEach(c=>{stereoBuf.set(c,off);off+=c.length;});const frames=totalFrames;const bytesPerSample=isFloatBit?4:bitDepth/8;const headerSize=44;const fileSizeBytes=headerSize+frames*bytesPerSample*outChannels;const view=new DataView(new ArrayBuffer(fileSizeBytes));const writeString=(o,s)=>{for(let i=0;i<s.length;i++)view.setUint8(o+i,s.charCodeAt(i));};writeString(0,'RIFF');view.setUint32(4,fileSizeBytes-8,true);writeString(8,'WAVE');writeString(12,'fmt ');view.setUint32(16,16,true);view.setUint16(20,fmtTag,true);view.setUint16(22,outChannels,true);view.setUint32(24,captureRate,true);view.setUint32(28,captureRate*bytesPerSample*outChannels,true);view.setUint16(32,bytesPerSample,true);view.setUint16(34,bitDepth,true);writeString(36,'data');view.setUint32(40,frames*bytesPerSample*outChannels,true);let o=44;for(let i=0;i<frames;i++){for(let ch=0;ch<outChannels;ch++){const raw=stereoBuf[i*2+ch];if(isFloatBit){view.setFloat32(o,raw,true);// bit-exact, no clamp/quantize
+const totalFrames=chunks.reduce((a,c)=>a+c.length/2,0);let stereoBuf=new Float32Array(totalFrames*2);let off=0;chunks.forEach(c=>{stereoBuf.set(c,off);off+=c.length;});// LOOP export: cắt cứng [loopStart, loopStart+loopDur) — bỏ phần trước + phần dư tail
+if(loopDur>0){const sf=Math.max(0,Math.floor(loopStart*captureRate))*2;const ef=Math.min(stereoBuf.length,Math.floor((loopStart+loopDur)*captureRate)*2);if(ef>sf)stereoBuf=stereoBuf.subarray(sf,ef);}const frames=stereoBuf.length/2;const bytesPerSample=isFloatBit?4:bitDepth/8;const headerSize=44;const fileSizeBytes=headerSize+frames*bytesPerSample*outChannels;const view=new DataView(new ArrayBuffer(fileSizeBytes));const writeString=(o,s)=>{for(let i=0;i<s.length;i++)view.setUint8(o+i,s.charCodeAt(i));};writeString(0,'RIFF');view.setUint32(4,fileSizeBytes-8,true);writeString(8,'WAVE');writeString(12,'fmt ');view.setUint32(16,16,true);view.setUint16(20,fmtTag,true);view.setUint16(22,outChannels,true);view.setUint32(24,captureRate,true);view.setUint32(28,captureRate*bytesPerSample*outChannels,true);view.setUint16(32,bytesPerSample,true);view.setUint16(34,bitDepth,true);writeString(36,'data');view.setUint32(40,frames*bytesPerSample*outChannels,true);let o=44;for(let i=0;i<frames;i++){for(let ch=0;ch<outChannels;ch++){const raw=stereoBuf[i*2+ch];if(isFloatBit){view.setFloat32(o,raw,true);// bit-exact, no clamp/quantize
 }else{// Single-stage TPDF dither, then clamp, then quantize (final export only)
-const s=Math.max(-1,Math.min(1,tpdfDither(raw)));if(bitDepth===24){const v=Math.floor(s<0?s*0x800000:s*0x7FFFFF)&0xFFFFFF;view.setUint8(o,v&0xFF);view.setUint8(o+1,v>>8&0xFF);view.setUint8(o+2,v>>16&0xFF);}else if(bitDepth===16)view.setInt16(o,Math.floor(s<0?s*0x8000:s*0x7FFF),true);else view.setUint8(o,Math.floor((s+1)*127.5),true);}o+=bytesPerSample;}}const blob=new Blob([view],{type:'audio/wav'});const url=URL.createObjectURL(blob);const a=document.createElement('a');a.href=url;a.download=`sonicforge-bounce-${captureRate}hz-${bitDepth}bit.wav`;a.click();URL.revokeObjectURL(url);showToast("Bounce hoàn tất — file gồm MIDI + FX Rack + Mastering Chain!","success");}catch(err){showToast("Lỗi bounce: "+err.message,"error");}finally{setIsExporting(false);}};const handleSaveLocalProject=name=>{const finalName=name||projectName||'Dự án mới';const localId=currentProjectId&&currentProjectId.startsWith('local_')?currentProjectId:'local_'+Date.now();const projectSchemaObj=serializeProjectToSchema(localId,finalName,bpm,tracks,subTabs,sessionTabs,masteringSettings,masterVolume);const dataStr=JSON.stringify(projectSchemaObj);localStorage.setItem('sonic_local_project_data',dataStr);localStorage.setItem('sonic_project_id',localId);localStorage.setItem('sonic_project_name',finalName);setCurrentProjectId(localId);setProjectName(finalName);window.SonicStorage.exportProjectToSFS(projectSchemaObj);showToast(`Đã lưu dự án local "${finalName}" thành công!`,"success");// Đã đăng nhập → đồng bộ lên Cloud (fire-and-forget): project mở được từ
+const s=Math.max(-1,Math.min(1,tpdfDither(raw)));if(bitDepth===24){const v=Math.floor(s<0?s*0x800000:s*0x7FFFFF)&0xFFFFFF;view.setUint8(o,v&0xFF);view.setUint8(o+1,v>>8&0xFF);view.setUint8(o+2,v>>16&0xFF);}else if(bitDepth===16)view.setInt16(o,Math.floor(s<0?s*0x8000:s*0x7FFF),true);else view.setUint8(o,Math.floor((s+1)*127.5),true);}o+=bytesPerSample;}}const blob=new Blob([view],{type:'audio/wav'});await downloadBlobViaServer(blob,`sonicforge-bounce-${captureRate}hz-${bitDepth}bit.wav`).catch(()=>{});showToast("Bounce hoàn tất — file gồm MIDI + FX Rack + Mastering Chain!","success");}catch(err){showToast("Lỗi bounce: "+err.message,"error");}finally{setIsExporting(false);}};const handleSaveLocalProject=name=>{const finalName=name||projectName||'Dự án mới';const localId=currentProjectId&&currentProjectId.startsWith('local_')?currentProjectId:'local_'+Date.now();const projectSchemaObj=serializeProjectToSchema(localId,finalName,bpm,tracks,subTabs,sessionTabs,masteringSettings,masterVolume);const dataStr=JSON.stringify(projectSchemaObj);localStorage.setItem('sonic_local_project_data',dataStr);localStorage.setItem('sonic_project_id',localId);localStorage.setItem('sonic_project_name',finalName);setCurrentProjectId(localId);setProjectName(finalName);window.SonicStorage.exportProjectToSFS(projectSchemaObj);showToast(`Đã lưu dự án local "${finalName}" thành công!`,"success");// Đã đăng nhập → đồng bộ lên Cloud (fire-and-forget): project mở được từ
 // máy khác / browser ẩn danh khi đăng nhập cùng tài khoản.
 if(currentUser&&window.SonicAPI&&window.SonicAPI.saveCloudProject){window.SonicAPI.saveCloudProject(finalName,dataStr).then(function(res){if(res&&res.project_id){console.log('[Cloud] local project synced:',res.project_id);}}).catch(function(e){console.warn('Cloud sync local project failed:',e);});}};const handleSaveCloudProject=async(name,existingProjectId)=>{const finalName=name||projectName||'Dự án mới';var useProjectId=existingProjectId||currentProjectId;const projectSchemaObj=serializeProjectToSchema(useProjectId||'project_'+Date.now(),finalName,bpm,tracks,subTabs,sessionTabs,masteringSettings,masterVolume);// Diagnostic: count source vs serialized items
 var srcMidi=0,srcClip=0,srcSec=0;tracks.forEach(function(t){srcMidi+=(t.midiItems||[]).length;srcClip+=(t.clips||[]).length;srcSec+=(t.sections||[]).length;});var serItems=0;if(projectSchemaObj.main_session&&projectSchemaObj.main_session.tracks){projectSchemaObj.main_session.tracks.forEach(function(st){if(st.items)serItems+=st.items.length;});}Object.keys(projectSchemaObj.section_store||{}).forEach(function(sk){(projectSchemaObj.section_store[sk].tracks||[]).forEach(function(st){if(st.items)serItems+=st.items.length;});});const dataJson=JSON.stringify(projectSchemaObj);try{if(existingProjectId){await window.SonicAPI.updateCloudProject(existingProjectId,finalName,dataJson);setProjectName(finalName);setCurrentProjectId(existingProjectId);localStorage.setItem('sonic_project_name',finalName);localStorage.setItem('sonic_project_id',existingProjectId);showToast('Đã ghi đè Cloud "'+finalName+'" (src midi='+srcMidi+' clip='+srcClip+' sec='+srcSec+' | ser='+serItems+').','success');}else if(currentProjectId&&!currentProjectId.startsWith('local_')){await window.SonicAPI.updateCloudProject(currentProjectId,finalName,dataJson);setProjectName(finalName);localStorage.setItem('sonic_project_name',finalName);localStorage.setItem('sonic_project_id',currentProjectId);showToast('Đã lưu Cloud "'+finalName+'" (src midi='+srcMidi+' clip='+srcClip+' sec='+srcSec+' | ser='+serItems+' id='+currentProjectId+').',serItems===0?'warning':'success');}else{const res=await window.SonicAPI.saveCloudProject(finalName,dataJson);const newProjId=res.project_id;setProjectName(finalName);localStorage.setItem('sonic_project_name',finalName);if(newProjId){setCurrentProjectId(newProjId);localStorage.setItem('sonic_project_id',newProjId);}showToast('Đã lưu Cloud mới "'+finalName+'" (src midi='+srcMidi+' clip='+srcClip+' sec='+srcSec+' | ser='+serItems+').',serItems===0?'warning':'success');}}catch(err){showToast(err.message||"Lỗi lưu dự án lên Cloud","error");}};const handleSaveProject=async()=>{if(!currentProjectId){setSaveProjectModalOpen(true);return;}if(currentProjectId.startsWith('local_')){handleSaveLocalProject(projectName);}else{if(!currentUser){showToast('Cần đăng nhập để lưu Cloud. currentUser='+(currentUser?'OK':'NULL')+' token='+(localStorage.getItem('sonic_token')?'exists':'missing'),'warning');return;}handleSaveCloudProject(projectName);}};const handleSaveProjectRef=useRef(handleSaveProject);handleSaveProjectRef.current=handleSaveProject;// ── Ctrl-S (Save) toàn cục ──
@@ -1930,16 +1943,18 @@ var srcMidi=0,srcClip=0,srcSec=0;tracks.forEach(function(t){srcMidi+=(t.midiItem
 // Projects). Docker/headless: lưu lên Cloud (đã login) hoặc local (.sfs).
 const handleGlobalSave=async()=>{try{const finalName=projectName||'Dự án mới';const schemaObj=serializeProjectToSchema(currentProjectId||'proj_'+Date.now(),finalName,bpm,tracks,subTabs,sessionTabs,masteringSettings,masterVolume);const dataJson=JSON.stringify(schemaObj);const runtime=window.SonicRuntime&&window.SonicRuntime.capabilities&&window.SonicRuntime.capabilities.runtime||'';if(runtime==='desktop'&&window.SonicAPI&&window.SonicAPI.saveProjectToDisk){// Desktop → thư mục của hệ điều hành
 const res=await window.SonicAPI.saveProjectToDisk(finalName,dataJson);showToast('Đã lưu dự án: '+(res&&res.path||finalName),'success');}else if(window.SonicAPI){// Docker / headless → Cloud (nếu đã đăng nhập), ngược lại local
-if(currentProjectId&&!currentProjectId.startsWith('local_')&&currentUser){await window.SonicAPI.updateCloudProject(currentProjectId,finalName,dataJson);showToast('Đã lưu dự án lên Cloud','success');}else if(currentUser){await handleSaveAsCloud(finalName);}else{handleSaveLocalProject(finalName);}}}catch(err){showToast('Lỗi lưu dự án: '+(err.message||err),'error');}};const handleGlobalSaveRef=useRef(handleGlobalSave);handleGlobalSaveRef.current=handleGlobalSave;useEffect(()=>{const handler=e=>{if((e.ctrlKey||e.metaKey)&&e.key.toLowerCase()==='s'){const target=e.target;if(target&&(target.tagName==='INPUT'||target.tagName==='TEXTAREA'||target.isContentEditable))return;e.preventDefault();handleGlobalSaveRef.current();}};window.addEventListener('keydown',handler);return()=>window.removeEventListener('keydown',handler);},[]);const handleSaveAsCloud=async newName=>{const projectSchemaObj=serializeProjectToSchema('project_'+Date.now(),newName,bpm,tracks,subTabs,sessionTabs,masteringSettings,masterVolume);const dataJson=JSON.stringify(projectSchemaObj);try{const res=await window.SonicAPI.saveCloudProject(newName,dataJson);const newProjId=res.project_id;setProjectName(newName);localStorage.setItem('sonic_project_name',newName);if(newProjId){setCurrentProjectId(newProjId);localStorage.setItem('sonic_project_id',newProjId);}showToast(`Đã lưu dự án dưới tên mới "${newName}" lên server!`,"success");}catch(err){showToast(err.message||"Lỗi Save As lên server","error");}};const handleSaveCloud=handleSaveProject;const handleExportSFS=(customName=null)=>{const finalName=customName||projectName||'Dự án SonicForge';const projectSchemaObj=serializeProjectToSchema(currentProjectId||'proj_'+Date.now(),finalName,bpm,tracks,subTabs,sessionTabs,masteringSettings,masterVolume);window.SonicStorage.exportProjectToSFS(projectSchemaObj);showToast("Đã xuất dự án (.sfs) thành công!","success");};const handleImportSFS=()=>{const input=document.createElement('input');input.type='file';input.accept='.sfs,application/json';input.onchange=async e=>{if(!e.target.files[0])return;try{const proj=await window.SonicStorage.importProjectFromSFSFile(e.target.files[0]);let restored=[];let restoredBpm=bpm;let restoredSessionTabs=[];let restoredSubTabs=[];if(proj.main_session){const result=deserializeProjectFromSchema(proj);restored=result.tracks;restoredBpm=result.bpm;restoredSessionTabs=result.sessionTabs;restoredSubTabs=result.subTabs;if(result.masteringSettings)setMasteringSettings(result.masteringSettings);if(result.masterVolume!==undefined&&result.masterVolume!==null)setMasterVolume(result.masterVolume);}else{restored=(proj.tracks||[]).map(t=>({...t,buffer:null,channelInfo:t.channelInfo||null,clips:t.clips||[],serverFileId:t.serverFileId||null}));}if(restored.length>0){setTracks(restored);loadAudioBuffersForTracks(restored);setBpm(restoredBpm.toString());setProjectName(proj.name||'Dự án mới');setCurrentProjectId(null);if(restoredSessionTabs.length>0)setSessionTabs(restoredSessionTabs);if(restoredSubTabs.length>0)setSubTabs(restoredSubTabs);localStorage.setItem('sonic_project_name',proj.name||'Dự án mới');localStorage.removeItem('sonic_project_id');showToast(`Đã nạp dự án "${proj.name||'Dự án mới'}" từ tệp .sfs thành công!`,"success");}}catch(err){showToast(err.message||"Lỗi mở tệp .sfs","error");}};input.click();};const clientSideExport=async activeTracks=>{setIsExporting(true);showToast("Đang trộn âm thanh đa kênh (Offline Mixdown)...","info");try{const targetRate=parseInt(exportSettings.sampleRate);const bitDepth=parseInt(exportSettings.bitDepth);// MAIN SESSION end time (items trên track main — sections theo bounds) —
+if(currentProjectId&&!currentProjectId.startsWith('local_')&&currentUser){await window.SonicAPI.updateCloudProject(currentProjectId,finalName,dataJson);showToast('Đã lưu dự án lên Cloud','success');}else if(currentUser){await handleSaveAsCloud(finalName);}else{handleSaveLocalProject(finalName);}}}catch(err){showToast('Lỗi lưu dự án: '+(err.message||err),'error');}};const handleGlobalSaveRef=useRef(handleGlobalSave);handleGlobalSaveRef.current=handleGlobalSave;useEffect(()=>{const handler=e=>{if((e.ctrlKey||e.metaKey)&&e.key.toLowerCase()==='s'){const target=e.target;if(target&&(target.tagName==='INPUT'||target.tagName==='TEXTAREA'||target.isContentEditable))return;e.preventDefault();handleGlobalSaveRef.current();}};window.addEventListener('keydown',handler);return()=>window.removeEventListener('keydown',handler);},[]);const handleSaveAsCloud=async newName=>{const projectSchemaObj=serializeProjectToSchema('project_'+Date.now(),newName,bpm,tracks,subTabs,sessionTabs,masteringSettings,masterVolume);const dataJson=JSON.stringify(projectSchemaObj);try{const res=await window.SonicAPI.saveCloudProject(newName,dataJson);const newProjId=res.project_id;setProjectName(newName);localStorage.setItem('sonic_project_name',newName);if(newProjId){setCurrentProjectId(newProjId);localStorage.setItem('sonic_project_id',newProjId);}showToast(`Đã lưu dự án dưới tên mới "${newName}" lên server!`,"success");}catch(err){showToast(err.message||"Lỗi Save As lên server","error");}};const handleSaveCloud=handleSaveProject;const handleExportSFS=(customName=null)=>{const finalName=customName||projectName||'Dự án SonicForge';const projectSchemaObj=serializeProjectToSchema(currentProjectId||'proj_'+Date.now(),finalName,bpm,tracks,subTabs,sessionTabs,masteringSettings,masterVolume);window.SonicStorage.exportProjectToSFS(projectSchemaObj);showToast("Đã xuất dự án (.sfs) thành công!","success");};const handleImportSFS=()=>{const input=document.createElement('input');input.type='file';input.accept='.sfs,application/json';input.onchange=async e=>{if(!e.target.files[0])return;try{const proj=await window.SonicStorage.importProjectFromSFSFile(e.target.files[0]);let restored=[];let restoredBpm=bpm;let restoredSessionTabs=[];let restoredSubTabs=[];if(proj.main_session){const result=deserializeProjectFromSchema(proj);restored=result.tracks;restoredBpm=result.bpm;restoredSessionTabs=result.sessionTabs;restoredSubTabs=result.subTabs;if(result.masteringSettings)setMasteringSettings(result.masteringSettings);if(result.masterVolume!==undefined&&result.masterVolume!==null)setMasterVolume(result.masterVolume);}else{restored=(proj.tracks||[]).map(t=>({...t,buffer:null,channelInfo:t.channelInfo||null,clips:t.clips||[],serverFileId:t.serverFileId||null}));}if(restored.length>0){setTracks(restored);loadAudioBuffersForTracks(restored);setBpm(restoredBpm.toString());setProjectName(proj.name||'Dự án mới');setCurrentProjectId(null);if(restoredSessionTabs.length>0)setSessionTabs(restoredSessionTabs);if(restoredSubTabs.length>0)setSubTabs(restoredSubTabs);localStorage.setItem('sonic_project_name',proj.name||'Dự án mới');localStorage.removeItem('sonic_project_id');showToast(`Đã nạp dự án "${proj.name||'Dự án mới'}" từ tệp .sfs thành công!`,"success");}}catch(err){showToast(err.message||"Lỗi mở tệp .sfs","error");}};input.click();};const clientSideExport=async(activeTracks,loopInfo)=>{setIsExporting(true);showToast("Đang trộn âm thanh đa kênh (Offline Mixdown)...","info");try{const targetRate=parseInt(exportSettings.sampleRate);const bitDepth=parseInt(exportSettings.bitDepth);// MAIN SESSION end time (items trên track main — sections theo bounds) —
 // offline render không cắt sớm; MIDI cache (preview) giữ max với cache.
-let durationLimit=Math.max(0.1,computeMainSessionEndTime(activeTracks));// Include preview-captured MIDI cache length (soundfont tracks have no clips)
-Object.keys(midiCacheRef.current).forEach(id=>{const c=midiCacheRef.current[id];if(c&&c.duration>durationLimit)durationLimit=c.duration;});const outChannels=exportSettings.channels==='mono'?1:2;const offlineCtx=new OfflineAudioContext(outChannels,Math.ceil(targetRate*Math.max(0.1,durationLimit)),targetRate);// Build the FULL graph (per-track FX Rack chains + mastering chain — the
+// LOOP export: độ dài chính xác = loopDur (không kéo đuôi, không fade)
+let durationLimit=loopInfo&&loopInfo.loopDur?loopInfo.loopDur:Math.max(0.1,computeMainSessionEndTime(activeTracks));// Include preview-captured MIDI cache length (soundfont tracks have no clips)
+// LOOP: midi buffer đã cắt đúng loopDur → không cho cache kéo dài file
+const loopActive=!!(loopInfo&&loopInfo.loopDur);Object.keys(midiCacheRef.current).forEach(id=>{const c=midiCacheRef.current[id];if(c&&!loopActive&&c.duration>durationLimit)durationLimit=c.duration;});const outChannels=exportSettings.channels==='mono'?1:2;const offlineCtx=new OfflineAudioContext(outChannels,Math.ceil(targetRate*Math.max(0.1,durationLimit)),targetRate);// Build the FULL graph (per-track FX Rack chains + mastering chain — the
 // same DSP as playback), so the exported file matches what you hear.
 const savedMasterBus=masterBus;const offlineNodes={};try{window.currentMasteringSettings=masteringSettings||window.currentMasteringSettings;try{if(typeof stopAllPlayback==='function')stopAllPlayback();}catch(e){}masterBus=null;initMasterBus(offlineCtx);try{toggleMasteringOnMaster(!!(masteringSettings&&masteringSettings.masterConnected),!!(masteringSettings&&masteringSettings.isBypassed));}catch(e){console.warn('offline mastering toggle error:',e);}// Main out volume (master fader) áp vào offline bus — file export phải
 // đúng độ lớn nghe được (flow: ... → Mastering FX Chain → Main out).
 // Trước đây offline masterBus.output luôn = 1.0 → export sai volume.
 try{if(masterBus&&masterBus.output){const mv=typeof masterVolume==='number'&&isFinite(masterVolume)?masterVolume:0;masterBus.output.gain.setValueAtTime(mv<=-50?0:Math.pow(10,mv/20),0);}}catch(e){console.warn('offline main-out volume error:',e);}activeTracks.forEach(t=>{const node=buildOfflineTrackNode(t,offlineCtx,offlineNodes);if(!node)return;const clips=t.clips&&t.clips.length>0?t.clips:t.buffer?[{id:'default',buffer:t.buffer,startTime:t.startTime||0,name:t.name,speed:t.speed||1.0}]:[];clips.forEach(clip=>{if(!clip.buffer)return;const source=offlineCtx.createBufferSource();source.buffer=clip.buffer;source.playbackRate.value=clip.speed||1.0;source.connect(node.gainNode);const clipStart=clip.startTime||0;source.start(clipStart);});// MIDI preview cache → schedule through the SF chain (track FX + mastering)
-if(node.sfEntry){const midiBuf=midiCacheToBuffer(t.id);if(midiBuf){const mSrc=offlineCtx.createBufferSource();mSrc.buffer=midiBuf;mSrc.connect(node.sfEntry);mSrc.start(0);}}});const renderedBuffer=await offlineCtx.startRendering();const numExportCh=renderedBuffer.numberOfChannels;const exportLength=renderedBuffer.length;const bytesPerSample=bitDepth/8;const headerSize=44;const fileSizeBytes=headerSize+exportLength*bytesPerSample*numExportCh;const fileBuffer=new ArrayBuffer(fileSizeBytes);const view=new DataView(fileBuffer);const writeString=(offset,string)=>{for(let i=0;i<string.length;i++){view.setUint8(offset+i,string.charCodeAt(i));}};writeString(0,'RIFF');view.setUint32(4,fileSizeBytes-8,true);writeString(8,'WAVE');writeString(12,'fmt ');view.setUint32(16,16,true);view.setUint16(20,1,true);view.setUint16(22,numExportCh,true);view.setUint32(24,targetRate,true);view.setUint32(28,targetRate*bytesPerSample*numExportCh,true);view.setUint16(32,bytesPerSample,true);view.setUint16(34,bitDepth,true);writeString(36,'data');view.setUint32(40,exportLength*bytesPerSample*numExportCh,true);let offset=44;for(let i=0;i<exportLength;i++){for(let ch=0;ch<numExportCh;ch++){const chData=renderedBuffer.getChannelData(ch);const sample=Math.max(-1,Math.min(1,chData[i]));if(bitDepth===8){view.setUint8(offset,Math.floor((sample+1.0)*127.5));}else if(bitDepth===16){view.setInt16(offset,Math.floor(sample<0?sample*0x8000:sample*0x7FFF),true);}else if(bitDepth===24){const val24=Math.floor(sample<0?sample*0x800000:sample*0x7FFFFF);view.setUint8(offset,val24&0xFF);view.setUint8(offset+1,val24>>8&0xFF);view.setUint8(offset+2,val24>>16&0xFF);}offset+=bytesPerSample;}}const blob=new Blob([view],{type:'audio/wav'});const url=URL.createObjectURL(blob);if((exportSettings.format==='mp3'||exportSettings.format==='ogg')&&serverStatus==='connected'){setIsExporting(true);showToast("Đang gửi yêu cầu nén định dạng lên máy chủ...","info");try{const file=new File([blob],`session_export.wav`,{type:'audio/wav'});const formData=new FormData();formData.append('file',file);const uploadResp=await fetch(`${API_AUDIO}/upload`,{method:'POST',body:formData});if(!uploadResp.ok)throw new Error("Upload to transcode server failed");const uploadData=await uploadResp.json();const fileId=uploadData.file_id;const exportResp=await fetch(`${API_AUDIO}/export`,{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({file_id:fileId,format:exportSettings.format,sample_rate:targetRate,bit_depth:bitDepth})});if(!exportResp.ok)throw new Error("Transcode request failed");const exportData=await exportResp.json();const result=await pollTaskResult(exportData.task_id,20);if(result.success){const outId=result.output_file_id;const downloadUrl=`${API_AUDIO}/download/${outId}`;showToast(`Xuất bản âm thanh định dạng ${exportSettings.format.toUpperCase()} thành công!`,"success","Tải về",()=>{const a=document.createElement('a');a.href=downloadUrl;a.download=`sonicforge-session-${targetRate}hz-${bitDepth}bit.${exportSettings.format}`;a.click();});}else{throw new Error(result.error||'Server encoding failed');}}catch(transcodeErr){showToast(`Lỗi chuyển đổi: ${transcodeErr.message}.`,"warning","Tải WAV thay thế",()=>{const a=document.createElement('a');a.href=url;a.download=`sonicforge-session-${targetRate}hz-${bitDepth}bit.wav`;a.click();});}}else{if(exportSettings.format!=='wav'){showToast("Đang ngoại tuyến. Tải về định dạng WAV thay thế.","warning");}const a=document.createElement('a');a.href=url;a.download=`sonicforge-session-${targetRate}hz-${bitDepth}bit.wav`;a.click();showToast("Xuất bản âm thanh hoàn tất!","success");}URL.revokeObjectURL(url);}finally{// Restore the live master bus + live mastering state after offline render.
+if(node.sfEntry){const midiBuf=midiCacheToBuffer(t.id);if(midiBuf){let mSrcBuf=midiBuf;if(loopInfo&&loopInfo.loopDur){const ln=Math.min(midiBuf.length,Math.max(1,Math.ceil(loopInfo.loopDur*midiBuf.sampleRate)));mSrcBuf=offlineCtx.createBuffer(midiBuf.numberOfChannels,ln,midiBuf.sampleRate);for(let mc=0;mc<midiBuf.numberOfChannels;mc++)mSrcBuf.copyToChannel(midiBuf.getChannelData(mc).subarray(0,ln),mc);}const mSrc=offlineCtx.createBufferSource();mSrc.buffer=mSrcBuf;mSrc.connect(node.sfEntry);mSrc.start(0);}}});const renderedBuffer=await offlineCtx.startRendering();const numExportCh=renderedBuffer.numberOfChannels;const exportLength=renderedBuffer.length;const bytesPerSample=bitDepth/8;const headerSize=44;const fileSizeBytes=headerSize+exportLength*bytesPerSample*numExportCh;const fileBuffer=new ArrayBuffer(fileSizeBytes);const view=new DataView(fileBuffer);const writeString=(offset,string)=>{for(let i=0;i<string.length;i++){view.setUint8(offset+i,string.charCodeAt(i));}};writeString(0,'RIFF');view.setUint32(4,fileSizeBytes-8,true);writeString(8,'WAVE');writeString(12,'fmt ');view.setUint32(16,16,true);view.setUint16(20,1,true);view.setUint16(22,numExportCh,true);view.setUint32(24,targetRate,true);view.setUint32(28,targetRate*bytesPerSample*numExportCh,true);view.setUint16(32,bytesPerSample,true);view.setUint16(34,bitDepth,true);writeString(36,'data');view.setUint32(40,exportLength*bytesPerSample*numExportCh,true);let offset=44;for(let i=0;i<exportLength;i++){for(let ch=0;ch<numExportCh;ch++){const chData=renderedBuffer.getChannelData(ch);const sample=Math.max(-1,Math.min(1,chData[i]));if(bitDepth===8){view.setUint8(offset,Math.floor((sample+1.0)*127.5));}else if(bitDepth===16){view.setInt16(offset,Math.floor(sample<0?sample*0x8000:sample*0x7FFF),true);}else if(bitDepth===24){const val24=Math.floor(sample<0?sample*0x800000:sample*0x7FFFFF);view.setUint8(offset,val24&0xFF);view.setUint8(offset+1,val24>>8&0xFF);view.setUint8(offset+2,val24>>16&0xFF);}offset+=bytesPerSample;}}const blob=new Blob([view],{type:'audio/wav'});const wavName=`sonicforge-session-${targetRate}hz-${bitDepth}bit.wav`;if((exportSettings.format==='mp3'||exportSettings.format==='ogg')&&serverStatus==='connected'){setIsExporting(true);showToast("Đang gửi yêu cầu nén định dạng lên máy chủ...","info");try{const file=new File([blob],`session_export.wav`,{type:'audio/wav'});const formData=new FormData();formData.append('file',file);const uploadResp=await fetch(`${API_AUDIO}/upload`,{method:'POST',body:formData});if(!uploadResp.ok)throw new Error("Upload to transcode server failed");const uploadData=await uploadResp.json();const fileId=uploadData.file_id;const exportResp=await fetch(`${API_AUDIO}/export`,{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({file_id:fileId,format:exportSettings.format,sample_rate:targetRate,bit_depth:bitDepth})});if(!exportResp.ok)throw new Error("Transcode request failed");const exportData=await exportResp.json();const result=await pollTaskResult(exportData.task_id,20);if(result.success){const outId=result.output_file_id;const downloadUrl=`${API_AUDIO}/download/${outId}`;showToast(`Xuất bản âm thanh định dạng ${exportSettings.format.toUpperCase()} thành công!`,"success","Tải về",()=>{const a=document.createElement('a');a.href=downloadUrl;a.download=`sonicforge-session-${targetRate}hz-${bitDepth}bit.${exportSettings.format}`;a.click();});}else{throw new Error(result.error||'Server encoding failed');}}catch(transcodeErr){showToast(`Lỗi chuyển đổi: ${transcodeErr.message}.`,"warning","Tải WAV thay thế",()=>{downloadBlobViaServer(blob,wavName).catch(()=>{});});}}else{if(exportSettings.format!=='wav'){showToast("Đang ngoại tuyến. Tải về định dạng WAV thay thế.","warning");}await downloadBlobViaServer(blob,wavName).catch(()=>{});showToast("Xuất bản âm thanh hoàn tất!","success");}}finally{// Restore the live master bus + live mastering state after offline render.
 masterBus=savedMasterBus;try{if(savedMasterBus)toggleMasteringOnMaster(!!(masteringSettings&&masteringSettings.masterConnected),!!(masteringSettings&&masteringSettings.isBypassed));}catch(e){}Object.keys(offlineNodes).forEach(k=>{try{if(offlineNodes[k].fxStopFn)offlineNodes[k].fxStopFn();}catch(e){}});}}catch(err){showToast("Lỗi xuất âm thanh: "+err.message,"error");}finally{setIsExporting(false);}};// ── AI Analysis (server-side with fallback) ──
 const triggerAIAnalysis=async()=>{setAnalysisState({status:'Connecting to AI Engine...',data:null,isRunning:true});// Check if we have a file on the server to analyze
 const activeTrack=tracks.find(t=>t.id===selectedTrackId);const serverFileId=serverFileIdMap[selectedTrackId];if(serverFileId&&serverStatus==='connected'){try{const resp=await fetch(`${API_AUDIO}/analyze-ai`,{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({file_id:serverFileId,api_base_url:aiConfig.baseUrl!==API_BASE_URL?aiConfig.baseUrl:null,model:aiConfig.model})});if(resp.ok){const data=await resp.json();showToast("Đang phân tích cấu trúc trên máy chủ...","info");try{const result=await pollTaskResult(data.task_id,15);if(result.bpm){if(selLeft!==null&&selRight!==null&&activeTrack&&activeTrack.buffer){const snapStart=findZeroCrossing(activeTrack.buffer,selLeft);const snapEnd=findZeroCrossing(activeTrack.buffer,selRight);if(selectionMode==='local'){setLocalSelectionStart(snapStart);setLocalSelectionEnd(snapEnd);}else{setSelectionStart(snapStart);setSelectionEnd(snapEnd);}}setAnalysisState({status:'Hoàn thành phân tích (Server)',data:result,isRunning:false});showToast(`AI Server: ${result.bpm} BPM | ${result.beats?.length||0} beats detected (Zero-Crossing Aligned)`,'success');return;}}catch(e){console.warn('Server AI poll failed, using fallback:',e);}}}catch(err){console.warn('Server AI analysis failed, using fallback:',err);}}// Fallback: client-side analysis with simulated BPM
diff --git a/app/templates/index.html b/app/templates/index.html
index dddb30a..1ac3593 100644
--- a/app/templates/index.html
+++ b/app/templates/index.html
@@ -50,7 +50,7 @@
     <script src="/static/js/services/midiExtractor.js?v=202607281052"></script>
     <script src="/static/js/services/promptTemplateManager.js?v=202607281039"></script>
     <script src="/static/js/services/undoRedoEngine.js?v=202607290941"></script>
-    <script src="/static/js/app.precompiled.js?v=202608211103" defer></script>
+    <script src="/static/js/app.precompiled.js?v=202608211105" defer></script>
     <link rel="stylesheet" href="/static/css/styles.css?v=202607271016">
     <style>
         :root {