// ==UserScript==
// @name        Deezer Media Session Support
// @namespace   http://tampermonkey.net/
// @description    Deezer Media Session Support for Chrome
// @include     http://*.deezer.com/*
// @include     https://*.deezer.com/*
// @version     1.0.3
// @run-at      document-idle
// @noframes
// @downloadURL none
// ==/UserScript==

(function (dzPlayer, prevSongId, seekConst, noLimit){
	setInterval(function(currSong){
        currSong = dzPlayer.getCurrentSong();
		if (currSong && currSong.SNG_ID !== prevSongId){
			noLimit && (dzPlayer.radioSkipCounter=1); // unlimited skips
			prevSongId = currSong.SNG_ID;
			navigator.mediaSession.metadata = new MediaMetadata({
				title: currSong.SNG_TITLE,
				artist: currSong.ART_NAME,
				album: currSong.ALB_TITLE,
				artwork: ['264x264'].map(function(size){
					return {'src': `https://e-cdns-images.dzcdn.net/images/cover/${currSong.ALB_PICTURE}/${size}-000000-80-0-0.jpg`,
						'sizes': size,
						'type': 'image/jpg'}
				})
			});
		}
	}, 500);

    navigator.mediaSession.setActionHandler('previoustrack', function() {
        if (!dzPlayer.isRadio() || noLimit){
            dzPlayer.control.prevSong();
        }
    });

    navigator.mediaSession.setActionHandler('nexttrack', function() {
        dzPlayer.control.nextSong();
    });

    navigator.mediaSession.setActionHandler('play', function() {
        dzPlayer.control.play();
    });

    navigator.mediaSession.setActionHandler('pause', function() {
        dzPlayer.control.pause();
    });

    navigator.mediaSession.setActionHandler('seekbackward', function() {
        dzPlayer.control.seek(Math.max(dzPlayer.getPosition() - seekConst, 0) / dzPlayer.getDuration());
    });

    navigator.mediaSession.setActionHandler('seekforward', function() {
        dzPlayer.control.seek(Math.min(dzPlayer.getPosition() + seekConst, dzPlayer.getDuration()) / dzPlayer.getDuration());
    });
})(dzPlayer, 0, 30, true);