// state.js (versão conceitual nova)
import {
  audioState,
  initializeAudioState,
  getAudioSnapshot,
  applyAudioSnapshot,
} from "./audio/audio_state.js";
import { DEFAULT_VOLUME, DEFAULT_PAN } from "./config.js";
import * as Tone from "https://esm.sh/tone";

// ---------------- ESTADOS INICIAIS ----------------

const patternState = {
  tracks: [],
  activeTrackId: null,
  activePatternIndex: 0,
};

const globalState = {
  sliceToolActive: false,
  isPlaying: false,
  isAudioEditorPlaying: false,
  playbackIntervalId: null,
  currentStep: 0,
  metronomeEnabled: false,
  originalXmlDoc: null,
  currentBeatBasslineName: "Novo Projeto",
  masterVolume: DEFAULT_VOLUME,
  masterPan: DEFAULT_PAN,
  zoomLevelIndex: 2,
  isLoopActive: false,
  loopStartTime: 0,
  loopEndTime: 8,
  resizeMode: "trim",
  selectedClipId: null,
  isRecording: false,
  clipboard: null,
  lastRulerClickTime: 0,
  justReset: false,
  syncMode: "global",
};

export let appState = {
  global: globalState,
  pattern: patternState,
  audio: audioState, // compartilhado com módulo de áudio
};

window.appState = appState;

// ---------------- HELPERS ----------------

function makePatternSnapshot() {
  return {
    tracks: appState.pattern.tracks.map((t) => ({
      id: t.id,
      name: t.name,
      type: t.type,
      samplePath: t.samplePath,
      patterns: (t.patterns || []).map((p) => ({
        name: p.name,
        steps: p.steps,
        notes: p.notes,
        pos: p.pos,
      })),
      activePatternIndex: t.activePatternIndex || 0,
      volume: t.volume,
      pan: t.pan,
      instrumentName: t.instrumentName,
      instrumentXml: t.instrumentXml,
    })),
    activeTrackId: appState.pattern.activeTrackId,
    activePatternIndex: appState.pattern.activePatternIndex,
  };
}


// ----------------------
// Helper: existe snapshot local com áudio?
// ----------------------
export function hasLocalAudioSnapshot() {
  if (!window.ROOM_NAME) return false;
  const raw = sessionStorage.getItem(`temp_state_${window.ROOM_NAME}`);
  if (!raw) return false;

  try {
    const data = JSON.parse(raw);

    // se tem tracks ou clips, consideramos snapshot válido
    const audio = data.audioSnapshot;
    if (!audio) return false;

    const hasTracks = audio.tracks && audio.tracks.length > 0;
    const hasClips = audio.clips && audio.clips.length > 0;

    return hasTracks || hasClips;
  } catch (e) {
    console.warn("hasLocalAudioSnapshot: erro ao analisar snapshot", e);
    return false;
  }
}

// ----------------------
// Helper: checa se um snapshot de áudio é "não vazio"
// ----------------------
function hasAudioInSnapshot(audioSnapshot) {
  if (!audioSnapshot) return false;

  const hasTracks =
    Array.isArray(audioSnapshot.tracks) && audioSnapshot.tracks.length > 0;
  const hasClips =
    Array.isArray(audioSnapshot.clips) && audioSnapshot.clips.length > 0;

  return hasTracks || hasClips;
}

// ---------------- RESET GERAL ----------------

export function resetProjectState() {
  console.log("Executando resetProjectState (Limpeza Profunda)...");

  Object.assign(appState.global, {
    sliceToolActive: false,
    isPlaying: false,
    isAudioEditorPlaying: false,
    playbackIntervalId: null,
    currentStep: 0,
    metronomeEnabled: false,
    originalXmlDoc: null,
    currentBeatBasslineName: "Novo Projeto",
    masterVolume: DEFAULT_VOLUME,
    masterPan: DEFAULT_PAN,
    zoomLevelIndex: 2,
    isLoopActive: false,
    loopStartTime: 0,
    loopEndTime: 8,
    resizeMode: "trim",
    selectedClipId: null,
    isRecording: false,
    clipboard: null,
    lastRulerClickTime: 0,
    justReset: false,
    syncMode: appState.global.syncMode ?? "global",
  });

  Object.assign(appState.pattern, {
    tracks: [],
    activeTrackId: null,
    activePatternIndex: 0,
  });

  initializeAudioState();
}

// ---------------- SALVAR SESSÃO LOCAL ----------------

export function saveStateToSession() {
  if (!window.ROOM_NAME) return;

  try {
    // Pattern “puro”
    const patternSnapshot = makePatternSnapshot();

    // XML original em string
    let originalXmlString = null;
    if (appState.global.originalXmlDoc) {
      const serializer = new XMLSerializer();
      try {
        originalXmlString = serializer.serializeToString(
          appState.global.originalXmlDoc
        );
      } catch (e) {
        console.warn("Não consegui serializar originalXmlDoc:", e);
      }
    }

    const audioSnapshot = getAudioSnapshot();

    const snapshot = {
      version: 1,
      global: {
        ...appState.global,
        playbackIntervalId: null,
        originalXmlDoc: originalXmlString,
      },
      pattern: patternSnapshot,
      audioSnapshot,
    };

    sessionStorage.setItem(
      `temp_state_${window.ROOM_NAME}`,
      JSON.stringify(snapshot)
    );
  } catch (e) {
    console.error("Erro salvando sessão:", e);
  }
}

// ---------------- CARREGAR SESSÃO LOCAL ----------------
// mode:
//  - "full" (global + pattern + audio)
//  - "audioOnly" (apenas áudio, usado como fallback
//                 depois de carregar XML do servidor)

export async function loadStateFromSession(mode = "full") {
  if (!window.ROOM_NAME) return false;

  const raw = sessionStorage.getItem(`temp_state_${window.ROOM_NAME}`);
  if (!raw) return false;

  try {
    const data = JSON.parse(raw);

    // GLOBAL & PATTERN só se for "full"
    if (mode === "full") {
      if (data.global) {
        const { originalXmlDoc: xmlString, ...rest } = data.global;
        Object.assign(appState.global, rest);

        if (xmlString) {
          try {
            const parser = new DOMParser();
            appState.global.originalXmlDoc = parser.parseFromString(
              xmlString,
              "application/xml"
            );
          } catch (e) {
            console.warn("Falha ao reconstituir originalXmlDoc:", e);
          }
        }
      }

      if (data.pattern) {
        Object.assign(appState.pattern, data.pattern);
      }
    }

    // ÁUDIO em qualquer modo, se existir
    if (hasAudioInSnapshot(data.audioSnapshot)) {
      initializeAudioState();
      await applyAudioSnapshot(data.audioSnapshot);
    }

    return true;
  } catch (e) {
    console.error("Erro carregando sessão:", e);
    return false;
  }
}