let isLooping = false; // Flag to manage loop state
let isLoadingMusic = false; // Flag to manage loading state
let currentPlaying = ''; // Store the filename of the currently playing music
let trackList = []; // Store currently displayed track filenames
let currentPage = 1;
let totalPages = 0;
let audio = new Audio();

window.onload = () => {
    // Attach click handlers for paging
    document.getElementById('prev-page').addEventListener('click', () => changePage(-1));
    document.getElementById('next-page').addEventListener('click', () => changePage(1));
    
    loadMusicList();
    document.getElementById('search-bar').addEventListener('keyup', () => {
        currentPage = 1; // Reset to first page on new search
        loadMusicList();
    });
    document.getElementById('audio-player').style.display = 'none';
    updatePageIndicator();
    setupCustomAudioPlayer();
};

function changePage(direction) {
    currentPage += direction;
    loadMusicList();
}

function updatePageIndicator(totalPages) {
    document.getElementById('page-indicator').textContent = `${currentPage}/${totalPages}`;
}

function debounce(func, delay) {
    let debounceTimer;
    return function() {
        const context = this;
        const args = arguments;
        clearTimeout(debounceTimer);
        debounceTimer = setTimeout(() => func.apply(context, args), delay);
    };
}

function toggleLoop() {
    isLooping = !isLooping;
    document.getElementById('loop-toggle').textContent = `Loop: ${isLooping ? 'On' : 'Off'}`;
    const player = document.getElementById('audio-player');
    player.loop = isLooping;
}

function updateNavigationVisibility(searchQuery, totalPages) {
    const navigation = document.getElementById('navigation');
    if (searchQuery) {
        navigation.style.display = 'none'; // Hide navigation during search
    } else {
        navigation.style.display = 'flex'; // Show navigation when not searching
        document.getElementById('prev-page').disabled = currentPage <= 1;
        document.getElementById('next-page').disabled = currentPage >= totalPages;
    }
}

// Call loadMusicList when the search input changes
document.getElementById('search-bar').addEventListener('keyup', debounce(() => {
    currentPage = 1;
    loadMusicList();
}, 500)); // Waits for 0.5s of inactivity after typing

function loadMusicList() {
    const searchQuery = document.getElementById('search-bar').value.toLowerCase();
    const params = new URLSearchParams({ page: currentPage });
    
    if (searchQuery) {
        params.append('search', searchQuery); // Add search query to the request if it exists
    }

    // Disabling buttons and showing loading indicator before the request
    document.getElementById('prev-page').disabled = true;
    document.getElementById('next-page').disabled = true;
    
    const loaderContainer = document.getElementById('loader-container');
    loaderContainer.innerHTML = ''; // Clears any existing loader elements if they are present
    const loaderElement = document.createElement('div');
    loaderElement.classList.add('loader');
    loaderContainer.appendChild(loaderElement);
     
    fetch(`/tracks?${params}`)
    .then(response => response.json())
    .then(data => {
        const { tracks, total } = data;
        const musicList = document.getElementById('music-list');
        musicList.innerHTML = '';
        trackList = [];
        const totalPages = Math.ceil(total / 5);
        
         // Hide loading indicator
        loaderContainer.innerHTML = '';

        // Re-enable buttons based on page state
        document.getElementById('prev-page').disabled = currentPage === 1;
        document.getElementById('next-page').disabled = currentPage === totalPages || searchQuery;

        tracks.forEach(track => {
            trackList.push(track.filename);
            const musicItem = createMusicItem(track);
            musicList.appendChild(musicItem);
        });

        // Show/hide navigation based on whether there is a search query
        updatePageIndicator(totalPages);
        updateNavigationVisibility(searchQuery, totalPages);
        updatePlayingIndicator();
    });
}

function createMusicItem(track) {
    const musicItem = document.createElement('div');
    musicItem.classList.add('music-item');
    musicItem.setAttribute('data-filename', track.filename);

    const artworkImg = document.createElement('img');
    artworkImg.src = track.artwork ? track.artwork : 'placeholder_art.png';
    artworkImg.alt = 'Album Art';
    artworkImg.classList.add('album-art');

    const fileNameSpan = document.createElement('span');
    fileNameSpan.textContent = track.filename;

    musicItem.append(artworkImg, fileNameSpan);

    // Bind the music item click to playMusic
    musicItem.addEventListener('click', () => playMusic(track.filename));

    return musicItem;
}

function updatePlayingIndicator() {
    const musicItems = document.querySelectorAll('.music-item');
    musicItems.forEach(item => {
        if (item.getAttribute('data-filename') === currentPlaying) {
            item.style.boxShadow = '0 0 10px rgba(255, 255, 255, 0.5)'; // Green box shadow
        } else {
            item.style.boxShadow = ''; // Remove box shadow from other items
        }
    });
}

function setupCustomAudioPlayer() {
    // Play/Pause toggle
    document.getElementById('play-pause-btn').addEventListener('click', function() {
        if (audio.paused) {
            audio.play();
            this.textContent = '❙❙'; // Update button text to "❙❙"
        } else {
            audio.pause();
            this.textContent = '▶'; // Update button text to "▶"
        }
    });

    // Update progress bar as the audio plays
    audio.addEventListener('timeupdate', function() {
        const progress = document.getElementById('progress-bar');
        progress.value = (audio.currentTime / audio.duration) * 100;
    });

    // Seek in the audio when the progress bar value changes
    document.getElementById('progress-bar').addEventListener('input', function() {
        const duration = audio.duration;
        audio.currentTime = (this.value * duration) / 100;
    });

    // Mute toggle
    document.getElementById('mute-btn').addEventListener('click', function() {
        audio.muted = !audio.muted;
        this.textContent = audio.muted ? '🔊' : '🔇'; // Update button text based on mute state
    });

    // Volume control
    document.getElementById('volume-control').addEventListener('input', function() {
        audio.volume = this.value / 100;
    });

    // Initial volume (100%)
    audio.volume = 1.0;

    audio.addEventListener('timeupdate', function() {
        updateProgress();
    });

    // When audio metadata is loaded, update duration
    audio.addEventListener('loadedmetadata', function() {
        document.getElementById('duration').textContent = formatTime(audio.duration);
    });
}

function updateProgress() {
    const progress = document.getElementById('progress-bar');
    progress.value = (audio.currentTime / audio.duration) * 100;
    document.getElementById('current-time').textContent = formatTime(audio.currentTime);
}

function formatTime(seconds) {
    let minutes = Math.floor(seconds / 60);
    minutes = (minutes >= 10) ? minutes : "0" + minutes;
    seconds = Math.floor(seconds % 60);
    seconds = (seconds >= 10) ? seconds : "0" + seconds;
    return minutes + ":" + seconds;
}

function playMusic(fileName) {
    if (isLoadingMusic && fileName === currentPlaying) {
        console.log("This song is already loading.");
        return;
    } else if (!isLoadingMusic && fileName === currentPlaying) {
        console.log("This song is already playing.");
        return;
    }

    isLoadingMusic = true;
    currentPlaying = fileName;

    updatePlayingIndicator();
    document.getElementById('audio-player').style.display = 'none'; // Hide custom player UI

    const loaderContainer = document.getElementById('loader-container');
    loaderContainer.innerHTML = '';
    const loaderElement = document.createElement('div');
    loaderElement.classList.add('loader');
    loaderContainer.appendChild(loaderElement);

    // Set the new source file for audio
    audio.src = `/music/${fileName}`;
    audio.load(); // Start loading the new source file

    audio.oncanplaythrough = () => {
        document.getElementById('audio-player').style.display = 'flex'; // Show custom player UI
        loaderContainer.innerHTML = '';
        isLoadingMusic = false;
        document.getElementById('play-pause-btn').textContent = '❙❙'; // Update play/pause button
        audio.play(); // Start playback
    };

    // Updated onended event handler within playMusic function
    audio.onended = () => {
      if (isLooping) {
          // Replay the current song
          audio.currentTime = 0;
          audio.play();
      } else {
          const currentIndex = trackList.indexOf(currentPlaying);
          if (currentIndex !== -1 && currentIndex < trackList.length - 1) {
              playMusic(trackList[currentIndex + 1]);
          }
      }
  };

    audio.onerror = () => {
        isLoadingMusic = false;
        alert(`Error loading the music: ${fileName}`);
        currentPlaying = ''; // Reset the current playing track
    };
}