/**
 * Plugin: jquery.zRSSFeed
 * 
 * Version: 1.1.2
 * (c) Copyright 2010-2011, Zazar Ltd
 * 
 * Description: jQuery plugin for display of RSS feeds via Google Feed API
 *              (Based on original plugin jGFeed by jQuery HowTo. Filesize function by Cary Dunn.)
 * 
 * History:
 * 1.1.2 - Added user callback function due to issue with ajaxStop after jQuery 1.4.2
 * 1.1.1 - Correction to null xml entries and support for media with jQuery < 1.5
 * 1.1.0 - Added support for media in enclosure tags
 * 1.0.3 - Added feed link target
 * 1.0.2 - Fixed issue with GET parameters (Seb Dangerfield) and SSL option
 * 1.0.1 - Corrected issue with multiple instances
 *
 **/

(function($){

$.fn.rssfeed = function(url, options, fn) {

// Set pluign defaults
var defaults = {
limit: 10,
header: true,
titletag: 'p',
date: true,
content: true,
snippet: true,
showerror: true,
errormsg: '',
key: null,
ssl: false,
linktarget: '_self'
};  
var options = $.extend(defaults, options); 

// Functions
return this.each(function(i, e) {
var $e = $(e);
var s = '';

// Check for SSL protocol
if (options.ssl) s = 's';

// Add feed class to user div
if (!$e.hasClass('rssFeed')) $e.addClass('rssFeed');

// Check for valid url
if(url == null) return false;

// Create Google Feed API address
var api = "http"+ s +"://ajax.googleapis.com/ajax/services/feed/load?v=1.0&callback=?&q=" + encodeURIComponent(url);
if (options.limit != null) api += "&num=" + options.limit;
if (options.key != null) api += "&key=" + options.key;
api += "&output=json_xml"

// Send request
$.getJSON(api, function(data){

// Check for error
if (data.responseStatus == 200) {

// Process the feeds
_process(e, data.responseData, options);

// Optional user callback function
if ($.isFunction(fn)) fn.call(this,$e);

} else {

// Handle error if required
if (options.showerror)
if (options.errormsg != '') {
var msg = options.errormsg;
} else {
var msg = data.responseDetails;
};
$(e).html('<div class="rssError"><p>'+ msg +'</p></div>');
};
});
});
};

// Function to create HTML result
var _process = function(e, data, options) {

// Get JSON feed data
var feeds = data.feed;
if (!feeds) {
return false;
}
var html = '';
var row = 'odd';

// Get XML data for media (parseXML not used as requires 1.5+)
var xml = getXMLDocument(data.xmlString);
var xmlEntries = xml.getElementsByTagName('item');

// Add header if required
if (options.header)
html +='<div class="rssHeader">' +
'<a href="'+feeds.link+'" title="'+ feeds.description +'">'+ feeds.title +'</a>' +
'</div>';

// Add body
html += '<div class="rssBody">' +
'<ul>';

// Add feeds
for (var i=0; i<feeds.entries.length; i++) {

// Get individual feed
var entry = feeds.entries[i];

// Format published date
var entryDate = new Date(entry.publishedDate);
var pubDate = entryDate.toLocaleDateString() + ' ' + entryDate.toLocaleTimeString();

// Add feed row
html += '<p class="news_list"><li class="rssRow '+row+'">' + 
'<'+ options.titletag + ' class="news_list"' + '><a href="'+ entry.link +'" title="View this feed at '+ feeds.title +'" target="'+ options.linktarget +'">'+ entry.title +'</a></'+ options.titletag +'>'
if (options.date) html += '<div>'+ pubDate +'</div>'
if (options.content) {

// Use feed snippet if available and optioned
if (options.snippet && entry.contentSnippet != '') {
var content = entry.contentSnippet;
} else {
var content = entry.content;
}

html += '<p>'+ content +'</p>'
}

// Add any media
if(xmlEntries.length > 0) {
var xmlMedia = xmlEntries[i].getElementsByTagName('enclosure');
if (xmlMedia.length > 0) {
html += '<div class="rssMedia"><div>Media files</div><ul>'
for (var m=0; m<xmlMedia.length; m++) {
var xmlUrl = xmlMedia[m].getAttribute("url");
var xmlType = xmlMedia[m].getAttribute("type");
var xmlSize = xmlMedia[m].getAttribute("length");
html += '<li><a href="'+ xmlUrl +'" title="Download this media">'+ xmlUrl.split('/').pop() +'</a> ('+ xmlType +', '+ formatFilesize(xmlSize) +')</li>';
}
html += '</ul></div>'
}
html += '</li></p>';
}

// Alternate row classes
if (row == 'odd') {
row = 'even';
} else {
row = 'odd';
}
}

html += '</ul>' +
'</div>'

$(e).html(html);
};

function formatFilesize(bytes) {
var s = ['bytes', 'kb', 'MB', 'GB', 'TB', 'PB'];
var e = Math.floor(Math.log(bytes)/Math.log(1024));
return (bytes/Math.pow(1024, Math.floor(e))).toFixed(2)+" "+s[e];
}

function getXMLDocument(string) {
var browser = navigator.appName;
var xml;
if (browser == 'Microsoft Internet Explorer') {
xml = new ActiveXObject('Microsoft.XMLDOM');
xml.async = 'false'
xml.loadXML(string);
} else {
xml = (new DOMParser()).parseFromString(string, 'text/xml');
}
return xml;
}

})(jQuery);