// SonicForge Native Audio Client (T15) — IPC JS → native engine.
// Track instrument KHÔNG còn đi masterBus WebAudio: master fader + track
// gain/pan áp native qua NativeMixer (SF host / VST2 / VST3 bridge DLL).
// WebAudio chỉ giữ cho UI/aux. Mọi call fire-and-forget — native engine
// tự âm thanh; không block UI.
window.SonicNativeAudio = window.SonicNativeAudio || {};

(function () {
    var BASE = window.API_BASE_URL || window.location.origin;

    function headers() {
        var h = { 'Content-Type': 'application/json' };
        var token = localStorage.getItem('sonic_token') || '';
        if (token) h['Authorization'] = 'Bearer ' + token;
        return h;
    }

    async function post(path, body) {
        var resp = await fetch(BASE + '/api/v1/native' + path, {
            method: 'POST',
            headers: headers(),
            body: JSON.stringify(body || {})
        });
        var data = await resp.json().catch(function () { return {}; });
        if (!resp.ok) throw new Error(data.detail || 'native API lỗi ' + resp.status);
        return data;
    }

    async function get(path) {
        var resp = await fetch(BASE + '/api/v1/native' + path, { headers: headers() });
        var data = await resp.json().catch(function () { return {}; });
        if (!resp.ok) throw new Error(data.detail || 'native API lỗi ' + resp.status);
        return data;
    }

    var _masterTimer = null;

    window.SonicNativeAudio = {
        status: function () {
            return get('/status');
        },
        // Master fader: debounce 40ms — fader kéo liên tục, chỉ gửi giá trị cuối.
        setMasterGain: function (gainDb) {
            if (_masterTimer) clearTimeout(_masterTimer);
            _masterTimer = setTimeout(function () {
                post('/set_master_gain', { gain_db: gainDb }).catch(function (e) {
                    console.warn('[NativeAudio] set_master_gain:', e.message);
                });
            }, 40);
        },
        setTrackGainPan: function (trackId, gainDb, pan) {
            return post('/track_gain_pan', { track_id: trackId, gain_db: gainDb, pan: pan }).catch(function (e) {
                console.warn('[NativeAudio] track_gain_pan:', e.message);
            });
        },
        ensureSf: function (trackId, sfId, bank, program) {
            return post('/sf/ensure', { track_id: trackId, sf_id: sfId || null, bank: bank || 0, program: program || 0, live: true }).catch(function (e) {
                console.warn('[NativeAudio] sf/ensure:', e.message);
            });
        },
        ensureVst2: function (trackId, pluginId, pluginPath) {
            return post('/vst2/ensure', { track_id: trackId, plugin_id: pluginId || null, plugin_path: pluginPath || null, live: true }).catch(function (e) {
                console.warn('[NativeAudio] vst2/ensure:', e.message);
            });
        },
        ensureVst3: function (trackId, pluginId, pluginPath) {
            return post('/vst3/ensure', { track_id: trackId, plugin_id: pluginId || null, plugin_path: pluginPath || null, live: true }).catch(function (e) {
                console.warn('[NativeAudio] vst3/ensure:', e.message);
            });
        },
        noteOn: function (kind, trackId, channel, pitch, velocity) {
            var path = kind === 'vst2' ? '/vst2/note_on' : (kind === 'vst3' ? '/vst3/note_on' : '/sf/note_on');
            // Rethrow sau warn: TrackInstrument can fallback autosample/WASM
            // khi native khong san sang (DLL/plugin loi).
            return post(path, { track_id: trackId, channel: channel || 0, pitch: pitch, velocity: velocity != null ? velocity : 100 }).catch(function (e) {
                console.warn('[NativeAudio] note_on:', e.message);
                throw e;
            });
        },
        noteOff: function (kind, trackId, channel, pitch) {
            var path = kind === 'vst2' ? '/vst2/note_off' : (kind === 'vst3' ? '/vst3/note_off' : '/sf/note_off');
            return post(path, { track_id: trackId, channel: channel || 0, pitch: pitch }).catch(function (e) {
                console.warn('[NativeAudio] note_off:', e.message);
                throw e;
            });
        },
        sfAudioStop: function (trackId) {
            return post('/sf/audio_stop', { track_id: trackId, pitch: 0 }).catch(function () {});
        }
    };
})();