IMPROVE: cài đặt thêm tool để có thể phối lại cho đoạn midi item hoặc viết thêm cho nó

app/static/js/app.jsx

@@ -769,14 +769,14 @@ function createEqProModule(ctx, params) {
     const f = filters[i]; if (!f) return;
     const now = ctx.currentTime;
     if (patch.type !== undefined) f.type = patch.type;
-    if (patch.freq !== undefined) f.frequency.setTargetAtTime(eqproClamp(b.freq, EQPRO_F_MIN, EQPRO_F_MAX), now, 0.005);
+    if (patch.freq !== undefined) f.frequency.setValueAtTime(eqproClamp(b.freq, EQPRO_F_MIN, EQPRO_F_MAX), now);
-    if (patch.q !== undefined) f.Q.setTargetAtTime(eqproClamp(b.q, 0.1, 18), now, 0.005);
+    if (patch.q !== undefined) f.Q.setValueAtTime(eqproClamp(b.q, 0.1, 18), now);
-    if (patch.gain !== undefined || patch.active !== undefined) f.gain.setTargetAtTime((b.active !== false) ? ((b.gain || 0) * amount / 100) : 0, now, 0.005);
+    if (patch.gain !== undefined || patch.active !== undefined) f.gain.setValueAtTime((b.active !== false) ? ((b.gain || 0) * amount / 100) : 0, now);
   };
   const setAmount = (a) => {
     amount = eqproClamp(a, 0, 200);
     const now = ctx.currentTime;
-    filters.forEach((f, i) => { const b = bands[i]; if (b) f.gain.setTargetAtTime((b.active !== false) ? ((b.gain || 0) * amount / 100) : 0, now, 0.005); });
+    filters.forEach((f, i) => { const b = bands[i]; if (b) f.gain.setValueAtTime((b.active !== false) ? ((b.gain || 0) * amount / 100) : 0, now); });
   };
   // Replace the internal band model + rebuild DSP immediately (add/delete/reset
   // from the UI) — guarantees the audible result matches the added bands at once.
@@ -13955,6 +13955,7 @@ const App = () => {
     isRunning: false,
   });
   const [aiPrompt, setAiPrompt] = useState('');
+  const [aiComposeMode, setAiComposeMode] = useState('SIMILAR_VARIATION');
   const [promptHistory, setPromptHistory] = useState([]);
   const [promptHistIdx, setPromptHistIdx] = useState(-1);
   const promptHistRef = useRef([]);
@@ -14083,7 +14084,7 @@ const App = () => {
     const tlist = activeTracks || tracks || [];
     for (const t of tlist) {
       const found = (t.midiItems || []).find(m => m.id === selId);
-      if (found) return { itemName: found.name, trackName: t.name, trackId: t.id, itemId: selId };
+      if (found) return { itemName: found.name, trackName: t.name, trackId: t.id, itemId: selId, notes: found.notes || [], startTime: found.startTime || 0, duration: found.duration || 4 };
     }
     return null;
   };
@@ -22507,6 +22508,206 @@ const App = () => {
     }
   };
 
+  // ── AI Compose Similar → NEXT TRACK (user request) ──
+  // Click MIDI item + gõ prompt → AI phân tích cấu trúc giai điệu trong item
+  // (pitch range, intervals, rhythm) → sáng tác giai điệu TƯƠNG TỰ → ghi MIDI
+  // notes vào track KẾ TIẾP; nếu track kế tiếp KHÔNG RỖNG → chèn track mới
+  // (ngay sau track hiện tại) và ghi MIDI item vào đó.
+  // ── AI Compose (ai_midi_rearrange_specification.md) ──
+  // Click MIDI item + chọn mode (Variation/Extend) + gõ prompt:
+  // 1. SonicMidiExtractor nén note (pitch + note_name, round 2dp) tiết kiệm token
+  // 2. Function Tool Schema rearrange_or_extend_midi_melody (2 mode)
+  // 3. Prompt engineering: ORIGINAL CONTEXT + USER DIRECTIVE + MODE DIRECTIVE + CONSTRAINTS
+  // 4. Ingest: SIMILAR_VARIATION → track mới ngay dưới (A/B); EXTEND_CONTINUATION → append item sau item gốc
+  const handleAiComposeFromItem = async (mode) => {
+    const selMidi = getSelectedMidiItemInfo();
+    if (!selMidi) { showToast('Hãy chọn 1 MIDI item trên timeline trước.', 'warning'); return; }
+    const prompt = aiPrompt.trim();
+    if (!prompt) { showToast('Vui lòng gõ prompt yêu cầu giai điệu.', 'warning'); return; }
+    const composeMode = mode === 'EXTEND_CONTINUATION' ? 'EXTEND_CONTINUATION' : 'SIMILAR_VARIATION';
+    setAiProcessing(true);
+    setAiActionLog(prev => [...prev, { type: 'status', text: ` 🎵 Đang phân tích "${selMidi.itemName}" (${(selMidi.notes || []).length} notes) + gửi AI [${composeMode === 'EXTEND_CONTINUATION' ? 'Extend' : 'Variation'}]...`, time: Date.now() }]);
+    try {
+      if (aiProviders.length === 0 || !selectedProviderId) {
+        try { const d = await window.SonicAPI.getAIConfigs(); if (d && d.providers && d.providers.length > 0) { setAiProviders(d.providers); const a = d.providers.find(p => p.is_active) || d.providers[0]; if (a) setSelectedProviderId(a.id); } } catch (e) {}
+      }
+      const prv = aiProviders.find(p => p.id === selectedProviderId) || (aiProviders.length > 0 ? aiProviders[0] : null);
+      const provider = prv || aiConfig;
+      const baseUrl = provider.api_base_url || provider.baseUrl || `${API_BASE_URL}`;
+      const apiKey = provider.api_key || provider.apiKey || '';
+      const model = provider.model_name || provider.model || 'deepseek-chat';
+      setAiActionLog(prev => [...prev, { type: 'info', text: ` Provider: ${provider.name || 'default'} | Model: ${model}`, time: Date.now() }]);
+
+      // STEP 1: extract + nén MIDI context (note_name, round 2dp) qua SonicMidiExtractor
+      if (!window.SonicMidiExtractor) throw new Error('SonicMidiExtractor chưa được nạp.');
+      const midiContext = window.SonicMidiExtractor.extractSelectedMIDIContext(activeTracksRef.current || activeTracks, selMidi.itemId, bpm);
+      const bpmVal = parseInt(bpm) || 120;
+      const secPerBar = (60.0 / bpmVal) * 4;
+      const srcItem = (activeTracksRef.current || activeTracks).flatMap(t => (t.midiItems || []).map(m => ({ ...m, trackId: t.id }))).find(m => m.id === selMidi.itemId);
+      const startBar = srcItem ? (srcItem.startTime || 0) / secPerBar : 0;
+      midiContext.start_bar = startBar;
+      midiContext.time_signature = '4/4';
+
+      // STEP 3: prompt engineering (spec §4)
+      const notesJSON = JSON.stringify(midiContext.notes, null, 2);
+      const nextStartBar = startBar + midiContext.duration_bars;
+      const modeDirective = composeMode === 'EXTEND_CONTINUATION'
+        ? `MODE: MELODIC EXTENSION (EXTEND / CONTINUATION)
+- Source Section: Bars ${startBar.toFixed(2)} -> ${nextStartBar.toFixed(2)} (${midiContext.duration_bars} bars).
+- DIRECTIVE: Write a CONTINUATION starting at Bar ${nextStartBar.toFixed(2)} spanning the next ${midiContext.duration_bars} bars.
+- Analyze the ending motif/cadence of the original sequence to craft a smooth transition, then develop the melody toward a climax or resolution.
+- Set target_start_bar = ${nextStartBar.toFixed(2)}, target_duration_bars = ${midiContext.duration_bars}.`
+        : `MODE: REARRANGEMENT / VARIATION (SIMILAR VARIATION / REARRANGE)
+- DIRECTIVE: Generate a NEW variation of EQUAL LENGTH (${midiContext.duration_bars} bars, spanning Beats 0.0 -> ${midiContext.total_beats}).
+- Retain the core harmonic framework/chord progression while applying variation techniques (Syncopation, Arpeggiator, Passing tones, Swing feel, Harmonization) as requested by the user.
+- Set target_start_bar = ${startBar.toFixed(2)}, target_duration_bars = ${midiContext.duration_bars}.`;
+      const promptText = `You are a professional AI Music Composer & Arranger.
+
+ORIGINAL MIDI MELODY CONTEXT FROM DAW:
+- Track: "${midiContext.track_name}" | Item: "${midiContext.item_name}"
+- Tempo: ${midiContext.bpm} BPM | Time Signature: ${midiContext.time_signature}
+- Location: Bar ${startBar.toFixed(2)} (Length: ${midiContext.duration_bars} bars / ${midiContext.total_beats} beats)
+- Array of ${midiContext.total_notes} original MIDI source notes:
+${notesJSON}
+
+USER DIRECTIVE:
+"${prompt}"
+
+${modeDirective}
+
+STRICT CONSTRAINTS:
+1. Return your answer as a SINGLE valid JSON object (NO markdown, NO code fences, NO explanation) with EXACTLY this shape:
+{"mode":"SIMILAR_VARIATION or EXTEND_CONTINUATION","composition_title":"short style title","target_start_bar":number,"target_duration_bars":number,"generated_notes":[{"pitch":60,"start_beat":0.0,"duration_beats":1.0,"velocity":0.8}]}
+2. Notes in generated_notes MUST cover the full beat range from 0.0 to ${midiContext.total_beats} without stopping prematurely.
+3. Ensure the final note sustains or resolves cleanly at beat ${midiContext.total_beats}.
+4. generated_notes start_beat is relative to the start of the generated item (beat 0.0 = first bar of the new section).`;
+
+      // STEP 2 + dispatch: provider hiện tại trả tool-call rác (_unknown) nên
+      // KHÔNG gửi tools — yêu cầu JSON thuần trong prompt (text-based, giống
+      // flow Piano Roll đã hoạt động).
+      const result = await window.AIGateway.executeAIPrompt({
+        prompt: promptText,
+        provider: provider.name || 'default',
+        model: model,
+        apiKey: apiKey,
+        baseUrl: baseUrl.replace(/\/chat\/completions$/, '').replace(/\/$/, ''),
+        systemInstruction: 'You are a professional AI Music Composer & Arranger. Output ONLY a single valid JSON object (no markdown, no code fences) matching the exact shape requested in the prompt.',
+        tools: []
+      });
+      if (!result) throw new Error('AI không phản hồi');
+
+      // STEP 4: decode — ƯU TIÊN textResponse (JSON thuần); functionCalls chỉ
+      // dùng khi đúng tên tool rearrange_or_extend_midi_melody (provider cũ
+      // trả tool-call rác _unknown chỉ chứa "reason" — bỏ qua).
+      let aiResult = null;
+      let rawDebug = '';
+      const pickNotes = obj => {
+        if (!obj) return null;
+        if (Array.isArray(obj)) return obj;
+        for (const k of ['generated_notes', 'notes', 'rearranged_notes', 'midi_notes']) {
+          if (Array.isArray(obj[k]) && obj[k].length > 0) return obj[k];
+        }
+        return null;
+      };
+      const textResp = result.textResponse || result.text || '';
+      if (textResp && typeof textResp === 'string' && textResp.trim()) {
+        try {
+          const cleaned = textResp.replace(/```json?\s*/g, '').replace(/```/g, '').trim();
+          const parsed = JSON.parse(cleaned);
+          const n = pickNotes(parsed);
+          if (n) aiResult = { mode: parsed.mode, composition_title: parsed.composition_title, target_start_bar: parsed.target_start_bar, target_duration_bars: parsed.target_duration_bars, generated_notes: n };
+        } catch (e1) { rawDebug = 'text: ' + textResp.slice(0, 400); console.error('Parse AI result error:', e1); }
+      }
+      if (!aiResult || !pickNotes(aiResult)) {
+        if (result.functionCalls && result.functionCalls.length > 0) {
+          const real = result.functionCalls.find(fc => fc.name === 'rearrange_or_extend_midi_melody');
+          if (real) {
+            try {
+              const a = typeof real.arguments === 'string' ? JSON.parse(real.arguments) : real.arguments;
+              const n = pickNotes(a);
+              if (n) aiResult = { mode: a.mode, composition_title: a.composition_title, target_start_bar: a.target_start_bar, target_duration_bars: a.target_duration_bars, generated_notes: n };
+            } catch (e2) { rawDebug += ' | FC-args-raw: ' + String(real.arguments).slice(0, 300); }
+          } else {
+            rawDebug += ' | FC names: ' + result.functionCalls.map(fc => fc.name || '_unknown').join(',') + ' (không phải tool đúng — bỏ qua)';
+          }
+        }
+      }
+      if (!aiResult || !pickNotes(aiResult)) {
+        console.error('[AI Compose] Không parse được notes. Debug:', rawDebug, '| functionCalls:', JSON.stringify(result.functionCalls || []).slice(0, 500), '| textResponse:', (result.textResponse || result.text || '').slice(0, 500));
+        setAiActionLog(prev => [...prev, { type: 'error', text: ' ❌ AI không trả về notes hợp lệ. ' + (rawDebug ? 'Raw: ' + rawDebug.slice(0, 200) : ''), time: Date.now() }]);
+        return;
+      }
+      const aiNotes = pickNotes(aiResult);
+      const finalMode = aiResult.mode === 'EXTEND_CONTINUATION' ? 'EXTEND_CONTINUATION' : 'SIMILAR_VARIATION';
+      const title = aiResult.composition_title || 'AI Composition';
+      const targetStartBar = (typeof aiResult.target_start_bar === 'number' ? aiResult.target_start_bar : (finalMode === 'EXTEND_CONTINUATION' ? nextStartBar : startBar));
+      const targetDurBars = (typeof aiResult.target_duration_bars === 'number' ? aiResult.target_duration_bars : midiContext.duration_bars);
+      const newNotes = aiNotes.map((n, i) => ({
+        id: 'note_ai_' + Date.now() + '_' + i,
+        pitch: Math.max(0, Math.min(127, parseInt(n.pitch) || 60)),
+        start_beat: Math.max(0, parseFloat(n.start_beat) || 0),
+        duration_beats: Math.max(0.125, parseFloat(n.duration_beats) || 0.25),
+        velocity: Math.max(0.1, Math.min(1.0, n.velocity ?? 0.8)),
+        pan: 0.0
+      }));
+      const newItem = {
+        id: 'item_ai_' + Date.now(),
+        startTime: Math.max(0, targetStartBar * secPerBar),
+        duration: Math.max(1, targetDurBars * secPerBar),
+        name: (finalMode === 'EXTEND_CONTINUATION' ? '[Extend] ' : '[Variation] ') + title,
+        notes: newNotes
+      };
+
+      // STEP 5: ingest — Variation → track mới ngay dưới (A/B); Extend → append item cuối track gốc
+      const curTracks = activeTracksRef.current || activeTracks;
+      const srcIdx = curTracks.findIndex(t => t.id === selMidi.trackId);
+      if (srcIdx === -1) { setAiActionLog(prev => [...prev, { type: 'error', text: ' ❌ Không tìm thấy track nguồn.', time: Date.now() }]); return; }
+      const sf = aiResult.soundfont_id || (midiContext.instrument && midiContext.instrument.soundfont_id) || 'generaluser_gs';
+      const sfBank = aiResult.soundfont_bank ?? ((midiContext.instrument && midiContext.instrument.soundfont_bank) ?? 0);
+      const sfProg = aiResult.soundfont_program ?? ((midiContext.instrument && midiContext.instrument.soundfont_program) ?? 0);
+      if (finalMode === 'EXTEND_CONTINUATION') {
+        // Append item mới vào CUỐI track gốc
+        updateActiveTracks(prev => prev.map(t => t.id === selMidi.trackId ? { ...t, midiItems: [...(t.midiItems || []), newItem] } : t));
+        setAiActionLog(prev => [...prev, { type: 'status', text: ` ✅ [Extend] "${newItem.name}" (${newNotes.length} notes) → append sau item gốc (bar ${targetStartBar.toFixed(2)}).`, time: Date.now() }]);
+      } else {
+        // Tạo track mới ngay dưới track nguồn (A/B testing) — spec §5.
+        // TUÂN THỦ RULES như track gốc: clone toàn bộ cấu trúc track nguồn
+        // (synth_engine, instrumentProgram/instrumentName, volumeDb, pan,
+        // fxActive, bypass flags, color...) rồi reset phần content.
+        const newTrackId = 'track_ai_var_' + Date.now();
+        const srcTrack = curTracks[srcIdx];
+        const newTrack = {
+          ...(srcTrack || {}),
+          id: newTrackId,
+          name: '[AI Var] ' + title,
+          buffer: null,
+          startTime: 0,
+          clips: [],
+          sections: [],
+          midiItems: [newItem],
+          muted: false,
+          solo: false,
+          markers: [],
+          serverFileId: null,
+          synth_engine: srcTrack && srcTrack.synth_engine ? srcTrack.synth_engine : { type: 'soundfont', soundfont_id: sf, soundfont_bank: sfBank, soundfont_program: sfProg },
+          instrumentProgram: srcTrack ? srcTrack.instrumentProgram : sfProg,
+          instrumentName: srcTrack ? srcTrack.instrumentName : ('AI ' + title)
+        };
+        updateActiveTracks(prev => { const copy = [...prev]; copy.splice(srcIdx + 1, 0, newTrack); return copy; });
+        setAiActionLog(prev => [...prev, { type: 'status', text: ` ✅ [Variation] "${newItem.name}" (${newNotes.length} notes) → track mới "[AI Var] ${title}" ngay dưới (A/B) — kế thừa synth/instrument của track gốc.`, time: Date.now() }]);
+      }
+      setCanvasRedrawCount(n => n + 1);
+      setTimeout(() => lucide.createIcons(), 200);
+    } catch (err) {
+      setAiActionLog(prev => [...prev, { type: 'error', text: ` ❌ Lỗi: ${err.message}`, time: Date.now() }]);
+      showToast(`AI Error: ${err.message}`, 'error');
+    } finally {
+      setAiProcessing(false);
+    }
+  };
+  // Alias cũ giữ cho nút UI hiện tại (Compose) hoạt động — mode mặc định Variation
+  const handleAiComposeToNextTrack = () => handleAiComposeFromItem('SIMILAR_VARIATION');
+
   // ── Split Track at Playhead ──
   const handleSplitTrackAtTime = (trackId, clipId, time) => {
     const track = tracks.find(t => t.id === trackId);
@@ -24895,6 +25096,25 @@ const App = () => {
         "data-lucide": "send",
         className: "w-3 h-3"
       })), " Gửi")), /*#__PURE__*/React.createElement("button", {
+        onClick: () => setAiComposeMode(aiComposeMode === 'EXTEND_CONTINUATION' ? 'SIMILAR_VARIATION' : 'EXTEND_CONTINUATION'),
+        title: "Chọn mode AI: Variation (biến tấu cùng độ dài) / Extend (viết tiếp các bar sau)",
+        className: "px-2 py-1 rounded text-[10px] border font-semibold flex items-center justify-center gap-1 " + (aiComposeMode === 'EXTEND_CONTINUATION' ? 'bg-sky-800 text-sky-100 border-sky-600' : 'bg-amber-800 text-amber-100 border-amber-600')
+      }, /*#__PURE__*/React.createElement("span", {
+        className: "inline-flex items-center shrink-0"
+      }, /*#__PURE__*/React.createElement("i", {
+        "data-lucide": aiComposeMode === 'EXTEND_CONTINUATION' ? "arrow-right" : "shuffle",
+        className: "w-3 h-3"
+      })), aiComposeMode === 'EXTEND_CONTINUATION' ? 'Extend' : 'Variation'), /*#__PURE__*/React.createElement("button", {
+        onClick: () => handleAiComposeFromItem(aiComposeMode),
+        disabled: aiProcessing,
+        title: "AI phân tích giai điệu MIDI item đang chọn → sáng tác theo mode đã chọn → ghi kết quả (Variation: track mới ngay dưới A/B; Extend: append sau item gốc)",
+        className: "px-2 py-1 bg-teal-800 hover:bg-teal-700 text-white rounded text-[10px] border border-teal-600 flex items-center justify-center gap-1" + (hasSelItem ? '' : ' opacity-40 pointer-events-none')
+      }, /*#__PURE__*/React.createElement("span", {
+        className: "inline-flex items-center shrink-0"
+      }, /*#__PURE__*/React.createElement("i", {
+        "data-lucide": "music-2",
+        className: "w-3 h-3"
+      })), " Compose"), /*#__PURE__*/React.createElement("button", {
         onClick: () => {
           setAiPrompt('');
           setAiActionLog([]);

app/static/js/services/aiGateway.js

@@ -121,6 +121,57 @@ const AIGateway = (function() {
     }
   };
 
+  // ai_midi_rearrange_specification.md §3 — Function Tool Schema hỗ trợ 2 mode:
+  // SIMILAR_VARIATION (biến tấu cùng độ dài) / EXTEND_CONTINUATION (viết tiếp
+  // các bar sau). AI trả gói dữ liệu có vị trí target trên Timeline.
+  const REARRANGE_EXTEND_TOOL_SPEC = {
+    type: 'function',
+    function: {
+      name: 'rearrange_or_extend_midi_melody',
+      description: 'Analyzes source MIDI melody data and returns either a variation (Variation) or continuation (Extend) based on user instructions.',
+      parameters: {
+        type: 'object',
+        properties: {
+          mode: {
+            type: 'string',
+            enum: ['SIMILAR_VARIATION', 'EXTEND_CONTINUATION'],
+            description: "Mode: 'SIMILAR_VARIATION' (new arrangement of equal length) or 'EXTEND_CONTINUATION' (writes subsequent bars)."
+          },
+          composition_title: {
+            type: 'string',
+            description: 'Short title describing the new melody style (e.g., Jazz Swing Variation, Epic Extension Part 2)'
+          },
+          target_start_bar: {
+            type: 'number',
+            description: 'Starting bar number for the generated notes on the Timeline'
+          },
+          target_duration_bars: {
+            type: 'number',
+            description: 'Total bar duration covered by the generated sequence'
+          },
+          soundfont_id: { type: 'string', default: 'generaluser_gs' },
+          soundfont_bank: { type: 'integer', default: 0 },
+          soundfont_program: { type: 'integer', default: 0 },
+          generated_notes: {
+            type: 'array',
+            description: 'Array of AI-generated MIDI notes.',
+            items: {
+              type: 'object',
+              properties: {
+                pitch: { type: 'integer', minimum: 0, maximum: 127 },
+                start_beat: { type: 'number', description: 'Starting beat position relative to beat 0.0 of the generated item' },
+                duration_beats: { type: 'number', minimum: 0.1 },
+                velocity: { type: 'number', minimum: 0.0, maximum: 1.0 }
+              },
+              required: ['pitch', 'start_beat', 'duration_beats', 'velocity']
+            }
+          }
+        },
+        required: ['mode', 'composition_title', 'target_start_bar', 'target_duration_bars', 'generated_notes']
+      }
+    }
+  };
+
   const REARRANGE_SCENARIOS = [
     {
       id: 'arpeggio',
@@ -456,6 +507,7 @@ Ví dụ: "Hãy chọn và copy từ bar 4 đến bar 12 của track 1 sau đó
   return {
     DEFAULT_TOOLS,
     REARRANGE_TOOL_SPEC,
+    REARRANGE_EXTEND_TOOL_SPEC,
     REARRANGE_SCENARIOS,
     detectRearrangeScenario,
     buildRearrangeMessage,

app/templates/index.html

@@ -17,14 +17,14 @@
     <script src="/static/js/services/storage.js?v=202607271016"></script>
     <script src="/static/js/services/soundfontStorage.js?v=202607271016"></script>
     <script src="/static/js/services/soundfontPlayer.js?v=202608031400"></script>
-    <script src="/static/js/services/aiGateway.js?v=202607271016"></script>
+    <script src="/static/js/services/aiGateway.js?v=202608037200"></script>
     <script src="/static/js/services/dawCommandDispatcher.js?v=202607271016"></script>
     <script src="/static/js/services/pianoRollTabService.js?v=202607272044"></script>
     <script src="/static/js/services/ghostNoteExtractor.js?v=202607271727"></script>
     <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=202608037000" defer></script>
+    <script src="/static/js/app.precompiled.js?v=202608037600" defer></script>
     <link rel="stylesheet" href="/static/css/styles.css?v=202607271016">
     <style>
         :root {

wiki.md

@@ -1,4 +1,37 @@
-### [2026-08-03] Task: Fix re-schedule STALE CLOSURE (dùng refs) + persist zoom qua reload
+### [2026-08-03] Task: Fix CÂM TOÀN CỤC — EQ PRO setTargetAtTime 0.005 gây "BiquadFilterNode: state is bad"
+- **Tóm tắt thay đổi:** User báo play + ARM MIDI preview đều không có âm thanh; console: `BiquadFilterNode: state is bad, probably due to unstable filter caused by fast parameter automation` — đúng cảnh báo cũ trong code (fast automation → master routing broken → CÂM toàn cục). Thủ phạm: EQ PRO `setBand`/`setAmount` dùng `setTargetAtTime(..., now, 0.005)` — automation 5ms quá nhanh → Chromium đánh dấu filter unstable vĩnh viễn (node cache dính). **Fix: đổi toàn bộ sang `setValueAtTime(x, now)`** (tức thì, không automation ramp → không flag) — 4 chỗ (freq/Q/gain trong setBand + gain trong setAmount). Hard refresh → module EQ PRO mới (filter mới) → hết câm.
+- **Các file ảnh hưởng:** `app/static/js/app.jsx`, `app/static/js/app.precompiled.js` (rebuild), `app/templates/index.html` (bump v=202608037600)
+- **Ghi chú/Test (nếu có):** BUILD OK 1002801 bytes, node --check OK, `pytest` 86 passed. Không còn setTargetAtTime 0.005 (EQ PRO) — setValueAtTime ✓.
+---
+- **Tóm tắt thay đổi:** Track `[AI Var]` do AI tạo không có âm thanh — thiếu cấu trúc như track MIDI gốc (instrumentProgram/instrumentName/synth_engine + các field rules). Fix: track mới = **clone toàn bộ track nguồn** (`...(srcTrack)`) — kế thừa synth_engine, instrumentProgram/Name, volumeDb, pan, fxActive, bypass flags, color... — rồi reset phần content (id, name `[AI Var] title`, buffer null, clips/sections rỗng, midiItems = [item AI], muted/solo false, markers rỗng, serverFileId null); fallback synth_engine/instrument từ aiResult hoặc item gốc nếu track nguồn thiếu. Track AI giờ tuân thủ rules như mọi track khác trong session.
+- **Các file ảnh hưởng:** `app/static/js/app.jsx`, `app/static/js/app.precompiled.js` (rebuild), `app/templates/index.html` (bump v=202608037500)
+- **Ghi chú/Test (nếu có):** BUILD OK 1002829 bytes, node --check OK, `pytest` 86 passed. Clone srcTrack ✓, instrumentProgram kế thừa ✓.
+---
+- **Tóm tắt thay đổi:** Debug log cho thấy provider trả **nhiều tool calls `_unknown`** (arguments chỉ chứa "reason" — không có notes) → tool-calling không hoạt động với provider hiện tại. Fix: **KHÔNG gửi `tools`** (`tools: []`); prompt yêu cầu **JSON thuần** (không markdown) với shape chính xác `{mode, composition_title, target_start_bar, target_duration_bars, generated_notes[]}` + constraint "notes phủ 0→total_beats, kết thúc sạch, start_beat relative". Parse: **ưu tiên textResponse** (JSON); functionCalls chỉ dùng khi `name === 'rearrange_or_extend_midi_melody'` (bỏ qua _unknown). Giữ `pickNotes` (generated_notes/notes/rearranged_notes/midi_notes/mảng thuần) + diagnostic raw khi vẫn fail.
+- **Các file ảnh hưởng:** `app/static/js/app.jsx`, `app/static/js/app.precompiled.js` (rebuild), `app/templates/index.html` (bump v=202608037400)
+- **Ghi chú/Test (nếu có):** BUILD OK 1002469 bytes, node --check OK, `pytest` 86 passed. tools:[] ✓, pickNotes ×2, JSON shape constraint ✓.
+---
+- **Tóm tắt thay đổi:** Lỗi "AI không trả về generated_notes hợp lệ" — model trả key/format khác (notes/rearranged_notes/mảng thuần) hoặc functionCalls arguments là mảng trực tiếp. Fix: `pickNotes(obj)` nhận `generated_notes | notes | rearranged_notes | midi_notes` hoặc mảng thuần; functionCalls arguments là mảng → bọc lại; textResponse parse → pickNotes; Khi vẫn fail: log `console.error` chi tiết (raw text 600 chars + functionCalls 500 + textResponse 500) + action log kèm Raw 200 chars để user dán lại chẩn đoán.
+- **Các file ảnh hưởng:** `app/static/js/app.jsx`, `app/static/js/app.precompiled.js` (rebuild), `app/templates/index.html` (bump v=202608037300)
+- **Ghi chú/Test (nếu có):** BUILD OK 1001539 bytes, node --check OK, `pytest` 86 passed. pickNotes ×5, aiNotes ×2.
+---
+- **Tóm tắt thay đổi:** Sửa tool AI theo spec đính kèm — chỉ cần click MIDI item + gõ prompt:
+  1. **STEP 1 — Extract/Nén**: `SonicMidiExtractor.extractSelectedMIDIContext(tracks, itemId, bpm)` — note gồm `note_name` (C4/D4 — tiết kiệm token), start_beat/duration_beats/velocity round 2dp; context: track/item, duration_bars, total_beats, bpm, total_notes.
+  2. **STEP 2 — Function Tool Schema**: thêm `REARRANGE_EXTEND_TOOL_SPEC` vào aiGateway.js (name `rearrange_or_extend_midi_melody`, 2 mode SIMILAR_VARIATION/EXTEND_CONTINUATION, params: mode, composition_title, target_start_bar, target_duration_bars, soundfont_id/bank/program, generated_notes[]) + export + window.AIGateway.
+  3. **STEP 3 — Prompt Engineering**: `handleAiComposeFromItem(mode)` build prompt đúng spec: ORIGINAL CONTEXT (track/item/bpm/time_sig/location/notes JSON) + USER DIRECTIVE + MODE DIRECTIVE (Extend: continuation từ bar kế; Variation: equal length, giữ hòa âm + kỹ thuật biến tấu) + STRICT CONSTRAINTS (bắt buộc function tool, notes phủ 0→total_beats, kết thúc sạch).
+  4. **STEPS 4-5 — Dispatch + Ingest**: gửi kèm `tools: [REARRANGE_EXTEND_TOOL_SPEC]`; decode functionCalls (fallback text JSON); **SIMILAR_VARIATION → track mới `[AI Var] title` ngay dưới track nguồn (A/B) + soundfont từ item gốc; EXTEND_CONTINUATION → append item `[Extend] title` cuối track gốc** (target_start_bar × secPerBar → giây).
+  5. **UI**: nút mode **Variation/Extend** (toggle, amber/sky) + nút **Compose** gọi `handleAiComposeFromItem(aiComposeMode)`; state `aiComposeMode`.
+- **Các file ảnh hưởng:** `app/static/js/services/aiGateway.js` (REARRANGE_EXTEND_TOOL_SPEC), `app/static/js/app.jsx`, `app/static/js/app.precompiled.js` (rebuild), `app/templates/index.html` (bump v=202608037200 cả aiGateway.js)
+- **Ghi chú/Test (nếu có):** BUILD OK 1000935 bytes, node --check OK, `pytest` 86 passed. handleAiComposeFromItem ×3, REARRANGE_EXTEND ×1, rearrange_or_extend ×2.
+---
+- **Tóm tắt thay đổi:** Tool AI mới theo yêu cầu: click MIDI item trên timeline → AI panel hiện nút **"Compose"** (teal, icon music-2; mờ khi chưa chọn item) → gõ prompt → **`handleAiComposeToNextTrack`**:
+  1. Lấy cấu trúc giai điệu item (`getSelectedMidiItemInfo` mở rộng trả notes/startTime/duration): noteCount, pitchRange, pitches, starts, durations, velocities (≤60 notes).
+  2. Gửi AIGateway: "Compose NEW melody SIMILAR in style/rhythm/motif but NOT identical" + yêu cầu user → parse JSON notes (giống handleAISend).
+  3. **Track kế tiếp**: track sau track nguồn — nếu RỖNG (không buffer/clips/midiItems/sections) → ghi vào đó; nếu KHÔNG RỖNG → **chèn track mới "AI Melody Track"** ngay sau track nguồn.
+  4. Tạo MIDI item (id midi_ai_*, startTime 0, duration = maxBeat × beatSec, name "AI Melody (tên item)") + notes mới → push vào track mục tiêu; action log + toast.
+- **Các file ảnh hưởng:** `app/static/js/app.jsx`, `app/static/js/app.precompiled.js` (rebuild), `app/templates/index.html` (bump v=202608037100)
+- **Ghi chú/Test (nếu có):** BUILD OK 996444 bytes, node --check OK, `pytest` 86 passed. handleAiComposeToNextTrack ×2 (định nghĩa + onClick).
+---
 - **Tóm tắt thay đổi:**
   1. **Re-schedule vẫn không chạy khi kéo clip**: rAF loop giữ `updatePlayhead` của RENDER CŨ — closure nắm `activeTracks`/`sessionTabs` STALE (effect deps không gồm chúng) → signature luôn cũ → không bao giờ phát hiện kéo. **Fix**: re-schedule dùng `activeTracksRef.current` + `sessionTabsRef.current` (sync mỗi render); solo check tính lại từ ref (`curTracks.some(t => t.solo)`).
   2. **Zoom persist**: `zoom` (App) khởi tạo từ `localStorage.sf_zoom` + effect lưu khi đổi → kích thước items giữ nguyên sau reload (zoom in/out).