// SonicForge TrackInstrument Service
// Bọc engine per-track: playNote/noteOff theo TrackInstrumentCtx
// (ch/program/synthEngine/sfId/bank/prog/dest) — dùng cho preview mọi nguồn
// (keybed, piano roll, draw, hardware MIDI, click) qua UnifiedMidiRouter.
// T15: native-first — SF track đi thẳng vào engine native (NativeAudioService
// + SF host bridge), SonicSF WASM chỉ là fallback khi native không sẵn sàng.
// Tạo mới mỗi note-on (overwrite registry) — voice cũ giữ engine cũ trong
// tracker nên note-off luôn stop đúng channel.
window.TrackInstrument = window.TrackInstrument || {};

(function () {
    function TrackInstrument(trackId, ctx) {
        this.trackId = trackId;
        this.ch = ctx ? (ctx.ch != null ? ctx.ch : 0) : 0;
        this.program = ctx ? ctx.program : undefined;
        this.synthEngine = ctx ? ctx.synthEngine : undefined;
        this.sfId = ctx ? ctx.sfId : undefined;
        this.bank = ctx ? (ctx.bank || 0) : 0;
        this.prog = ctx ? (ctx.prog || 0) : 0;
        this.dest = ctx ? (ctx.dest || null) : null;
    }

    // Loại engine native cho track: 'sf' (soundfont), 'vst3'/'vst2' (VSTi có
    // plugin_id) hay null (không native được → fallback WASM/autosample).
    TrackInstrument.prototype._nativeKind = function () {
        try {
            if (this.sfId) return 'sf';
            if (window.SonicNativeAudio && this.synthEngine && this.synthEngine.plugin_id) {
                var t = String(this.synthEngine.type || '');
                if (t.indexOf('vst2') !== -1) return 'vst2';
                if (t.indexOf('vst3') !== -1 || t.indexOf('vst') !== -1) return 'vst3';
            }
        } catch (e) { }
        return null;
    };

    // Native engine sẵn sàng cho track? (sfId cho SF, plugin_id cho VSTi)
    TrackInstrument.prototype._nativeReady = function () {
        return this._nativeKind() !== null;
    };

    // Đảm bảo channel đã select đúng instrument trước khi play (fire-and-forget:
    // playNote tự load + retry nếu SF chưa load xong — dedup trong loadSoundFont).
    TrackInstrument.prototype._ensure = function () {
        try {
            if (!window.SonicSF || !window.SonicSF.selectInstrument) return;
            if (this.sfId) {
                window.SonicSF.selectInstrument(this.ch, this.bank, this.prog, this.sfId);
            } else if (this.program !== undefined) {
                window.SonicSF.selectInstrument(this.ch, 0, this.program, null);
            }
        } catch (e) {
            console.warn('[TrackInstrument] selectInstrument error:', e);
        }
    };

    // Phát qua SonicSF WASM (fallback khi native fail). SonicSF tự autosample
    // VSTi (soundfontPlayer._playNoteFluid) nên không cần ensure riêng ở đây.
    TrackInstrument.prototype._fallbackPlayNote = function (pitch, velocity, durationMs, startTime) {
        try {
            if (!window.SonicSF || !window.SonicSF.playNote) return;
            this._ensure();
            var durF = (durationMs != null ? durationMs : 500) || 500;
            window.SonicSF.playNote(pitch, velocity != null ? velocity : 0.8, durF, startTime, this.program, this.dest, this.ch, this.synthEngine);
        } catch (e) {
            console.warn('[TrackInstrument] fallback playNote error:', e);
        }
    };

    // velocity: router đã normalize int 1-127 (unifiedMidiRouter.normalizeVelocity).
    TrackInstrument.prototype.playNote = function (pitch, velocity, durationMs, startTime) {
        var vel = velocity != null ? velocity : 100;
        var kind = this._nativeKind();
        if (kind) {
            try {
                var self = this;
                var dur = (durationMs != null ? durationMs : 500) || 500;
                if (kind === 'sf') {
                    // ensure native SF engine cho track (server dedup theo track_id)
                    window.SonicNativeAudio.ensureSf(this.trackId, this.sfId, this.bank, this.prog)
                        .catch(function () {});
                } else {
                    // VSTi live native (Phase 2): ensure + note-on qua bridge DLL.
                    // Server resolve plugin_id -> path; lỗi -> fallback WASM autosample.
                    if (kind === 'vst3') {
                        window.SonicNativeAudio.ensureVst3(this.trackId, this.synthEngine.plugin_id, this.synthEngine.plugin_path)
                            .catch(function () {});
                    } else {
                        window.SonicNativeAudio.ensureVst2(this.trackId, this.synthEngine.plugin_id, this.synthEngine.plugin_path)
                            .catch(function () {});
                    }
                }
                window.SonicNativeAudio.noteOn(kind, this.trackId, this.ch, pitch, vel).catch(function (err) {
                    // Native khong phat duoc (DLL/plugin loi) -> fallback WASM:
                    // SF track di SonicSF, VSTi di autosample (SonicSF tu ensure).
                    console.warn('[TrackInstrument] native noteOn fail -> WASM fallback:', err && err.message);
                    self._fallbackPlayNote(pitch, velocity, dur, startTime);
                });
                // ponytail: TrackInstrument không biết audioCtx → bỏ startTime
                // offset (delay = duration); thêm scheduling chính xác khi cần
                setTimeout(function () { self.noteOff(pitch); }, dur + 40);
                return;
            } catch (e) {
                console.warn('[TrackInstrument] native playNote error:', e);
            }
        }
        // Fallback SonicSF (WASM)
        this._fallbackPlayNote(pitch, velocity, durationMs, startTime);
    };

    TrackInstrument.prototype.noteOff = function (pitch) {
        var kind = this._nativeKind();
        if (kind) {
            try {
                window.SonicNativeAudio.noteOff(kind, this.trackId, this.ch, pitch).catch(function () {
                    // Native note-off fail -> stop qua WASM (neu note da fallback)
                    try { if (window.SonicSF && window.SonicSF.stopNote) window.SonicSF.stopNote(this.ch, pitch); } catch (e) {}
                });
            } catch (e) {}
        }
        // Belt-and-suspenders: stopNote WASM vo hai neu khong co note dang phat.
        try {
            if (window.SonicSF && window.SonicSF.stopNote) window.SonicSF.stopNote(this.ch, pitch);
        } catch (e) {}
    };

    window.TrackInstrument = TrackInstrument;
})();