import { loginWithSpotify, handleRedirect, getProfile, getCurrentTrack } from './spotify-api.js';

let isPremium = false;

const loginBtn = document.getElementById('login-btn');
const nowPlayingDiv = document.getElementById('now-playing');
const errorMsg = document.getElementById('error-msg');
const profilePic = document.getElementById('profile-pic');

loginBtn.onclick = loginWithSpotify;

async function main() {
    const access_token = await handleRedirect() || localStorage.getItem('access_token');
    if (!access_token) return;

    loginBtn.style.display = 'none';

    // Show user profile
    const profile = await getProfile(access_token);
    if (profile && profile.images && profile.images.length) {
        profilePic.src = profile.images[0].url;
        profilePic.style.display = '';
    }

    const isPremium = profile?.product === 'premium';

    ['play-btn', 'pause-btn', 'next-btn', 'prev-btn'].forEach(id => {
        const btn = document.getElementById(id);
        if (!isPremium) {
            btn.disabled = true;
            btn.title = 'Spotify Premium required for playback controls';
            btn.classList.add('opacity-50', 'cursor-not-allowed');
        }
    });

    const playBtn = document.getElementById('play-btn');
    const pauseBtn = document.getElementById('pause-btn');

    function showPause() {
        playBtn.style.display = 'none';
        pauseBtn.style.display = '';
    }
    function showPlay() {
        playBtn.style.display = '';
        pauseBtn.style.display = 'none';
    }

    function onPlaybackStateChanged(isPlaying) {
        if (isPlaying) {
            showPause();
        } else {
            showPlay();
        }
    }

    // Show now playing
    async function updateNowPlaying() {
        const track = await getCurrentTrack(access_token);
        if (!track || !track.item) {
            nowPlayingDiv.style.display = 'none';
            errorMsg.textContent = 'Nothing playing or no active device.';
            return;
        }
        nowPlayingDiv.style.display = '';
        errorMsg.textContent = '';
        document.getElementById('album-art').src = track.item.album.images[0].url;
        document.getElementById('track-title').textContent = track.item.name;
        document.getElementById('track-artist').textContent = track.item.artists.map(a => a.name).join(', ');
        document.getElementById('track-album').textContent = track.item.album.name;
        // Progress bar
        const progress = (track.progress_ms / track.item.duration_ms) * 100;
        document.getElementById('progress-bar').style.width = `${progress}%`;
        document.getElementById('progress-current').textContent = msToMinSec(track.progress_ms);
        document.getElementById('progress-duration').textContent = msToMinSec(track.item.duration_ms);

        onPlaybackStateChanged(track.is_playing);

    }
    setInterval(updateNowPlaying, 2000);
    updateNowPlaying();
}

function msToMinSec(ms) {
    const min = Math.floor(ms / 60000);
    const sec = Math.floor((ms % 60000) / 1000);
    return `${min}:${sec.toString().padStart(2, '0')}`;
}

main();