/* Takes an input parameter of milliseconds and converts these into
 * the format HH:MM:SS */
function convertToHHMMSS(timeInMS){
	var time = parseInt(timeInMS);
	
	var hours = parseInt(time / 3600000);
	time -= 3600000*hours;
		
	var minutes = parseInt(time / 60000);
	time -= 60000*minutes;
	
	var seconds = parseInt(time / 1000);
	
	hours = hours.toString();
	minutes = minutes.toString();
	seconds = seconds.toString();
	
	if (hours.length == 1)
		hours = "0" + hours;
	if (minutes.length == 1)
		minutes = "0" + minutes;
	if (seconds.length == 1)
		seconds = "0" + seconds;
	if (hours == "00")
		return minutes + ":" + seconds;
	else
		return hours + ":" + minutes + ":" + seconds;
}

function convertToHHMMSSmm(timeInMS){
	var time = parseInt(timeInMS);
	
	var hours = parseInt(time / 3600000);
	time -= 3600000*hours;
		
	var minutes = parseInt(time / 60000);
	time -= 60000*minutes;
	
	var seconds = parseInt(time / 1000);
	time -= 1000*seconds;
	
	var ms = parseInt(time);
	
	hours = hours.toString();
	minutes = minutes.toString();
	seconds = seconds.toString();
	ms = ms.toString();
	
	if (hours.length == 1)
		hours = "0" + hours;
	if (minutes.length == 1)
		minutes = "0" + minutes;
	if (seconds.length == 1)
		seconds = "0" + seconds;
		
	if (ms.length == 3)
		ms = ms.substring(0, 2);
	else if (ms.length == 2)
		ms = "0" + ms.substring(0,1);
	else if (ms.length == 1)
		ms = "00";
		
	if (hours == "00")
		return minutes + ":" + seconds + "." + ms;
	else
		return hours + ":" + minutes + ":" + seconds+ "." + ms;
}

function convertDateToHHMMSS(epochTime){
	var d = new Date(epochTime);
	
	var hours = d.getUTCHours().toString();
	var minutes = d.getUTCMinutes().toString();
	var seconds = d.getUTCSeconds().toString();

    //if (hours == "NaN")
        //alert("epochTime: " + epochTime);
	
	if (hours.length == 1)
		hours = "0" + hours;
	if (minutes.length == 1)
		minutes = "0" + minutes;
	if (seconds.length == 1)
		seconds = "0" + seconds;
	return hours + ":" + minutes + ":" + seconds;
}

function convertDateToPosixTime(s){
	var year = s.substring(0, 4);
	var month = s.substring(5, 7);
	var day = s.substring(8, 10);
	var hour = s.substring(11, 13);
	var minute = s.substring(14, 16);
	var sec = s.substring(17, 19);
	var msec = 0;
	if (s.length >= 20){
		msec = s.substring(20);
	}

	return Date.UTC(year, month, day, hour, minute, sec, msec);
}

/* This function decides whether a song should be played or stopped.
 * It decides the current state of music through the presence/absence
 * of the <audio> tag. It also takes care of the managing the play/pause
 * icons of the buttons. */
function audioPreview(e, uri){
    var elems = $('.ui-icon.ui-icon-pause');
    elems.attr("class", "ui-icon ui-icon-play");

    var s = $('#'+e);
    var spl = $('#side_playlist');
  
    if (spl.children('audio').length != 1){
        spl.append('<audio autoplay="autoplay"></audio>');
        //spl.children('audio').attr('autoplay', 'autoplay');
        spl.children('audio').attr('src', uri);
        var arr = $(s).children("a").children().attr("class", "ui-icon ui-icon-pause");

        var myAudio = spl.children('audio')[0];
        var canPlayMp3 = !!myAudio.canPlayType && "" != myAudio.canPlayType('audio/mpeg');
        var canPlayOgg = !!myAudio.canPlayType && "" != myAudio.canPlayType('audio/ogg; codecs="vorbis"');
        //alert(canPlayMp3);
        //alert(canPlayOgg);
    } else {
        if (spl.children('audio').attr('data-playlist-id') == $(s).attr("id")){
            spl.children("audio").remove();
        } else {
            spl.children('audio').attr('autoplay', 'autoplay');
            spl.children('audio').attr('src', uri);
            spl.children('audio').attr('data-playlist-id', $(s).attr("id"));
            $(s).children("a").children().attr("class", "ui-icon ui-icon-pause");
        }
    }
}