'use strict';

function formatTime(secs) {

if (isNaN(secs))

return;

secs = Math.floor(secs);

var formatedTime;

var seconds = secs % 60;

var minutes = Math.floor(secs / 60) % 60;

var hours = Math.floor(secs / 3600);

if (hours === 0) {

formatedTime =

(minutes < 10 ? '0' + minutes : minutes) + ':' +

(seconds < 10 ? '0' + seconds : seconds);

} else {

formatedTime =

(hours < 10 ? '0' + hours : hours) + ':' +

(minutes < 10 ? '0' + minutes : minutes) + ':' +

(seconds < 10 ? '0' + seconds : seconds);

}

return formatedTime;

}

// The Javascript implementation of Java’s String.hashCode() method.

function hash(str) {

var hash = 0;

if (str.length === 0) return hash;

for (var i = 0; i < str.length; i++) {

var c = str.charCodeAt(i);

hash = ((hash << 5) - hash) + c;

hash = hash & hash; // Convert to 32-bit integer

}

return hash;

}

function generateDefaultThumbnailURL(metadata) {

// If metadata does not contain both album and artist, then use title instead.

var infoForHash = (!metadata.album && !metadata.artist) ?

metadata.title : metadata.album + metadata.artist;

var hashedNumber = (Math.abs(hash(infoForHash)) % 10) + 1;

return '/style/images/AlbumArt' + hashedNumber + '_small.png';

}

// Fetch the cover art for a given file and return it as a Blob. If there's no

// embedded cover art, grab the appropriate placeholder image instead. XXX: This

// function is a bit convoluted, and we could stand to simplify things here,

// e.g. by merging placeholder art with embedded art and/or storing cover art

// on the sdcard.

function getAlbumArtBlob(fileinfo, callback) {

var getBlob = function(url, callback) {

var xhr = new XMLHttpRequest();

xhr.open('GET', url, true);

xhr.responseType = 'blob';

xhr.onload = function() {

callback(null, xhr.response);

};

// I don't think onerror usually gets called, but let's play it safe.

xhr.onerror = function() {

callback('error');

};

// Bad local URLs throw in send() for some reason.

try {

xhr.send();

} catch (e) {

callback(e);

}

};

if ('picture' in fileinfo.metadata) {

getThumbnailURL(fileinfo, function(url) {

if (!url)

return callback(null);

getBlob(url, callback);

});

}

else {

var url = generateDefaultThumbnailURL(fileinfo.metadata);

getBlob(url, callback);

}

}