let currentTrackIndex = 0;
let tracks = [];
const audio = new Audio();
let isPlaying = false;

// DOM Elements
const playBtn = document.getElementById('playBtn');
const trackList = document.getElementById('track-list');
const currentTimeElem = document.getElementById('current-time');
const durationElem = document.getElementById('duration-time');
const progressContainer = document.getElementById('progress-container');
const progressBar = document.getElementById('progress-bar');

// Fetch tracks and initialize
fetch('/tracks')
    .then(response => response.json())
    .then(data => {
        tracks = data;
        renderPlaylist();
        loadTrack(currentTrackIndex);
    });

function renderPlaylist() {
    trackList.innerHTML = tracks.map((track, index) => `
        <div class="list-group-item ${index === 0 ? 'active' : ''}" 
             onclick="playTrack(${index})">
            ${track.title} <span class="text-muted float-end">${track.artist}</span>
<span>${track.explicit === 'true' ? '<i class="bi bi-exclamation-circle" title="Explicit language"></i>' : ''} </span>
        </div>
    `).join('');
}

function playTrack(index) {
    currentTrackIndex = index;
    const items = document.querySelectorAll('.list-group-item')
    items.forEach(item => item.classList.remove('active'));
    items[index].classList.add('active');
    items[index].scrollIntoView( { behavior: 'smooth', block: 'nearest'})

    loadTrack(index);
    audio.play();
    isPlaying = true;
    updatePlayButton();
}

function loadTrack(index) {
    const track = tracks[index];
    audio.src = `/audio/${track.file}`;
    document.getElementById('cover').src = `/cover/${track.cover}`;
    document.getElementById('song-title').textContent = track.title;
    document.getElementById('song-artist').textContent = track.artist;
}

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

function updatePlayButton() {
    const icon = playBtn.querySelector('i');
    icon.classList.toggle('bi-play-fill', !isPlaying);
    icon.classList.toggle('bi-pause-fill', isPlaying);
}

function nextTrack() {
    currentTrackIndex = (currentTrackIndex + 1) % tracks.length;
    playTrack(currentTrackIndex);
}

function previousTrack() {
    currentTrackIndex = (currentTrackIndex - 1 + tracks.length) % tracks.length;
    playTrack(currentTrackIndex);
}

// Time formatting
function formatTime(seconds) {
    const minutes = Math.floor(seconds / 60);
    seconds = Math.floor(seconds % 60);
    return `${minutes}:${seconds.toString().padStart(2, '0')}`;
}

// Audio event listeners
audio.addEventListener('timeupdate', () => {
    const progressPercent = (audio.currentTime / audio.duration) * 100;
    progressBar.style.width = `${progressPercent}%`;

    currentTimeElem.textContent = formatTime(audio.currentTime);
    durationElem.textContent = formatTime(duration);
});

audio.addEventListener('loadedmetadata', () => {
    durationElem.textContent = formatTime(audio.duration);
});

audio.addEventListener('ended', nextTrack);
audio.addEventListener('play', () => {
    isPlaying = true;
    updatePlayButton();
});
audio.addEventListener('pause', () => {
    isPlaying = false;
    updatePlayButton();
});

progressContainer.addEventListener('click', (e) => {
    if (!audio.duration) return;

    const rect = progressContainer.getBoundingClientRect();
    const x = e.clientX - rect.left;
    const percentage = x / progressContainer.offsetWidth;
    const seekTime = percentage * audio.duration;
    audio.currentTime = seekTime;
});