mmpSearch/assets/js/creations/audio/audio_state.js

// js/audio_state.js
import { DEFAULT_VOLUME, DEFAULT_PAN } from "../config.js";
import { renderAudioEditor } from "./audio_ui.js";
import { getMainGainNode } from "../audio.js";
import { getAudioContext } from "../audio.js";

export let audioState = {
    tracks: [],
    clips: [],
    audioEditorStartTime: 0,
    audioEditorAnimationId: null,
    audioEditorPlaybackTime: 0,
    isAudioEditorLoopEnabled: false,
};

export function initializeAudioState() {
    audioState.clips.forEach(clip => {
        if (clip.pannerNode) clip.pannerNode.dispose();
        if (clip.gainNode) clip.gainNode.dispose();
    });
    Object.assign(audioState, {
        tracks: [],
        clips: [],
        audioEditorStartTime: 0,
        audioEditorAnimationId: null,
        audioEditorPlaybackTime: 0,
        isAudioEditorLoopEnabled: false,
    });
}

export async function loadAudioForClip(clip) {
  if (!clip.sourcePath) return clip;
  
  const audioCtx = getAudioContext();
  if (!audioCtx) {
      console.error("AudioContext não disponível para carregar áudio.");
      return clip;
  }
  
  try {
    const response = await fetch(clip.sourcePath);
    if (!response.ok) throw new Error(`Falha ao buscar áudio: ${clip.sourcePath}`);
    const arrayBuffer = await response.arrayBuffer();
    const audioBuffer = await audioCtx.decodeAudioData(arrayBuffer);

    clip.buffer = audioBuffer; 

    // --- CORREÇÃO: Salva a duração original ---
    if (clip.durationInSeconds === 0) {
      clip.durationInSeconds = audioBuffer.duration;
    }
    // Salva a duração real do buffer para cálculos de stretch
    clip.originalDuration = audioBuffer.duration;

  } catch (error) {
    console.error(`Falha ao carregar áudio para o clipe ${clip.name}:`, error);
  }
  return clip;
}

export function addAudioClipToTimeline(samplePath, trackId = 1, startTime = 0) {
    const newClip = {
        id: Date.now() + Math.random(),
        trackId: trackId,
        sourcePath: samplePath,
        name: samplePath.split('/').pop(),
        
        startTimeInSeconds: startTime,
        offset: 0,
        durationInSeconds: 0, 
        originalDuration: 0, // Será preenchido pelo loadAudioForClip

        pitch: 0,
        volume: DEFAULT_VOLUME,
        pan: DEFAULT_PAN,

        gainNode: new Tone.Gain(Tone.gainToDb(DEFAULT_VOLUME)),
        pannerNode: new Tone.Panner(DEFAULT_PAN),
        
        buffer: null,
        player: null,
    };
    
    newClip.gainNode.connect(newClip.pannerNode);
    newClip.pannerNode.connect(getMainGainNode());

    audioState.clips.push(newClip);
    
    loadAudioForClip(newClip).then(() => {
        renderAudioEditor();
    });
}

export function updateAudioClipProperties(clipId, properties) {
    const clip = audioState.clips.find(c => c.id == clipId);
    if (clip) {
        Object.assign(clip, properties);
    }
}

export function sliceAudioClip(clipId, sliceTimeInTimeline) {
    const originalClip = audioState.clips.find(c => c.id == clipId);
    
    if (!originalClip || 
        sliceTimeInTimeline <= originalClip.startTimeInSeconds || 
        sliceTimeInTimeline >= (originalClip.startTimeInSeconds + originalClip.durationInSeconds)) {
        console.warn("Corte inválido: fora dos limites do clipe.");
        return;
    }

    const originalOffset = originalClip.offset || 0;
    const cutPointInClip = sliceTimeInTimeline - originalClip.startTimeInSeconds;

    const newClip = {
        id: Date.now() + Math.random(),
        trackId: originalClip.trackId,
        sourcePath: originalClip.sourcePath,
        name: originalClip.name,
        buffer: originalClip.buffer,
        
        startTimeInSeconds: sliceTimeInTimeline,
        offset: originalOffset + cutPointInClip,
        durationInSeconds: originalClip.durationInSeconds - cutPointInClip,
        
        // --- CORREÇÃO: Propaga a duração original ---
        originalDuration: originalClip.originalDuration,

        pitch: originalClip.pitch,
        volume: originalClip.volume,
        pan: originalClip.pan,

        gainNode: new Tone.Gain(Tone.gainToDb(originalClip.volume)),
        pannerNode: new Tone.Panner(originalClip.pan),
        
        player: null
    };

    newClip.gainNode.connect(newClip.pannerNode);
    newClip.pannerNode.connect(getMainGainNode());

    originalClip.durationInSeconds = cutPointInClip;

    audioState.clips.push(newClip);
    
    console.log("Clipe dividido. Original:", originalClip, "Novo:", newClip);
}

// ... (resto do arquivo 'audio_state.js' sem alterações) ...
export function updateClipVolume(clipId, volume) {
  const clip = audioState.clips.find((c) => c.id == clipId);
  if (clip) {
    const clampedVolume = Math.max(0, Math.min(1.5, volume));
    clip.volume = clampedVolume;
    if (clip.gainNode) {
        clip.gainNode.gain.value = Tone.gainToDb(clampedVolume);
    }
  }
}

export function updateClipPan(clipId, pan) {
  const clip = audioState.clips.find((c) => c.id == clipId);
  if (clip) {
    const clampedPan = Math.max(-1, Math.min(1, pan));
    clip.pan = clampedPan;
    if (clip.pannerNode) {
        clip.pannerNode.pan.value = clampedPan;
    }
  }
}

export function addAudioTrackLane() {
    const newTrackName = `Pista de Áudio ${audioState.tracks.length + 1}`;
    audioState.tracks.push({ id: Date.now(), name: newTrackName });
}

export function removeAudioClip(clipId) {
    const clipIndex = audioState.clips.findIndex(c => c.id == clipId);
    if (clipIndex === -1) return false; // Retorna false se não encontrou

    const clip = audioState.clips[clipIndex];

    // 1. Limpa os nós de áudio do Tone.js
    if (clip.gainNode) {
        clip.gainNode.disconnect();
        clip.gainNode.dispose();
    }
    if (clip.pannerNode) {
        clip.pannerNode.disconnect();
        clip.pannerNode.dispose();
    }
    
    // 2. Remove o clipe do array de estado
    audioState.clips.splice(clipIndex, 1);

    // 3. Retorna true para o chamador (Controller)
    return true;
}