loop/node-server/assets/script.js

// 1. Sélection des éléments DOM
const vinyl = document.getElementById('vinyl');
const audio = document.getElementById('audio');
const progress = document.getElementById('progress');
const currentTimeEl = document.getElementById('currentTime');
const durationEl = document.getElementById('duration');
const backwardBtn = document.getElementById('backward');
const forwardBtn = document.getElementById('forward');
const loopBtn = document.getElementById('loop');

// 2. Variables utiles
let isPlaying = false;
let isLooping = false;
let idleTimeout = null;
let lastPosition = null;
let lastTime = null;

const rotationsPerTrack = 3; // tours complets du vinyle sur toute la durée
let currentRotation = 0;     // rotation en degrés actuelle du vinyle

// 3. Connexion Socket.io
const socket = io();

socket.on('position', (position) => {
  const now = Date.now();

  if (lastPosition !== null && lastTime !== null) {
    const deltaPos = position - lastPosition;
    const deltaTime = (now - lastTime) / 1000;

    const speed = deltaPos / deltaTime; // vitesse de rotation

    clearTimeout(idleTimeout);

    // Seuil de mouvement pour arrêt
    if (Math.abs(speed) < 5) {
      stopPlayback();
      return;
    }

    if (speed < 0) {
      // Rotation inverse : on recule la timeline
      audio.pause();
      isPlaying = false;
      // recule proportionnellement à la vitesse (sensibilité ajustable)
      audio.currentTime = Math.max(0, audio.currentTime + speed * 0.0025);
    } else {
      // Rotation avant : jouer la piste et ajuster vitesse
      if (!isPlaying) {
        audio.play();
        isPlaying = true;
      }
      let playbackSpeed = 0.5 + speed / 400;
      playbackSpeed = Math.min(Math.max(playbackSpeed, 0.5), 1.5);
      audio.playbackRate = playbackSpeed;
    }
  }

  lastPosition = position;
  lastTime = now;

  // Détection d'inactivité
  idleTimeout = setTimeout(() => {
    stopPlayback();
  }, 300);
});

// 4. Fonctions

function togglePlay() {
  if (isPlaying) {
    audio.pause();
  } else {
    audio.play();
  }
  isPlaying = !isPlaying;
}

function updateProgress() {
  if (!isNaN(audio.duration)) {
    const progressPercent = (audio.currentTime / audio.duration) * 100;
    progress.value = progressPercent;
    currentTimeEl.textContent = formatTime(audio.currentTime);
    durationEl.textContent = formatTime(audio.duration);

    updateVinylRotation();
  }
}

function formatTime(time) {
  const minutes = Math.floor(time / 60);
  const seconds = Math.floor(time % 60);
  return `${minutes}:${seconds < 10 ? '0' : ''}${seconds}`;
}

function setProgress(e) {
  const width = progress.clientWidth;
  const clickX = e.offsetX;
  const duration = audio.duration;
  audio.currentTime = (clickX / width) * duration;
}

function stopPlayback() {
  audio.pause();
  isPlaying = false;
  audio.playbackRate = 1;
}

// La rotation est synchronisée avec la timeline audio
function updateVinylRotation() {
  if (audio.duration && audio.currentTime >= 0) {
    // Rotation proportionnelle au temps courant
    currentRotation = (audio.currentTime / audio.duration) * 360 * rotationsPerTrack;
    vinyl.style.transform = `rotate(${currentRotation}deg)`;
    console.log('Rotation:', currentRotation); // Debug
  }
}

// 5. Événements

vinyl.addEventListener('click', togglePlay);
audio.addEventListener('timeupdate', updateProgress);
audio.addEventListener('loadedmetadata', () => {
  durationEl.textContent = formatTime(audio.duration);
  console.log('Audio duration:', audio.duration);
});
progress.addEventListener('click', setProgress);

backwardBtn.addEventListener('click', () => {
  audio.currentTime = Math.max(0, audio.currentTime - 10);
});

forwardBtn.addEventListener('click', () => {
  audio.currentTime = Math.min(audio.duration, audio.currentTime + 10);
});

loopBtn.addEventListener('click', () => {
  isLooping = !isLooping;
  loopBtn.style.backgroundColor = isLooping ? 'white' : 'transparent';
  loopBtn.style.color = isLooping ? '#18344b' : 'white';
});

audio.addEventListener('ended', () => {
  if (isLooping) {
    audio.currentTime = 0;
    audio.play();
  } else {
    isPlaying = false;
  }
});