/**
 * Plugin: jquery.zRSSFeed
 * 
 * Version: 1.0.1
 * (c) Copyright 2010, Zazar Ltd
 * 
 * Description: jQuery plugin for display of RSS feeds via Google Feed API
 *              (Based on original plugin jGFeed by jQuery HowTo)
 * 
 * History:
 * 1.0.1 - Corrected issue with multiple instances
 *
 **/

(function($){

	var current = null; 
	
	$.fn.rssfeed = function(url, options) {	
	
		// Set pluign defaults
		var defaults = {
			limit: 10,
			header: true,
			titletag: 'h4',
			date: true,
			content: true,
			snippet: true,
			showerror: true,
			errormsg: '',
			key: null
		};  
		var options = $.extend(defaults, options); 
		
		// Functions
		return this.each(function(i, e) {
			var $e = $(e);
			
			// 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://ajax.googleapis.com/ajax/services/feed/load?v=1.0&callback=?&q=" + url;
			if (options.limit != null) api += "&num=" + options.limit;
			if (options.key != null) api += "&key=" + options.key;

			// Send request
			$.getJSON(api, function(data){
				
				// Check for error
				if (data.responseStatus == 200) {
	
					// Process the feeds
					_callback(e, data.responseData.feed, options);
				} 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>');
				};
			});				
		});
	};
	
	var _timeFormat = function(timeStamp)
	{
		var now = new Date();

		var diff = parseInt((now.getTime() - Date.parse(timeStamp)) / 1000);

		var tweetTimestamp = '';
		if (diff < 60)
		{
			tweetTimestamp += diff + ' second' + (diff == 1 ? '' : 's') + ' ago';
		}
		else if (diff < 3600)
		{
			var t = parseInt((diff + 30) / 60);
			tweetTimestamp += t + ' minute' + (t == 1 ? '' : 's') + ' ago';
		}
		else if (diff < 86400)
		{
			var t = parseInt((diff + 1800) / 3600);
			tweetTimestamp += t + ' hour' + (t == 1 ? '' : 's') + ' ago';
		}
		else
		{
			var d = new Date(timeStamp);
			var period = 'AM';

			var hours = d.getHours();
			if (hours > 12)
			{
				hours -= 12;
				period = 'PM';
			}

			var mins = d.getMinutes();
			var minutes = (mins < 10 ? '0' : '') + mins;

			var monthName = [ "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" ];

			tweetTimestamp += monthName[d.getMonth()] + ' ' + d.getDate();

			if (d.getFullYear() < now.getFullYear())
			{
				tweetTimestamp += ', ' + d.getFullYear();
			}

			var t = parseInt((diff + 43200) / 86400);
			tweetTimestamp += ' (' + t + ' day' + (t == 1 ? '' : 's') + ' ago)';
		}

		return tweetTimestamp;
	};
	
	// Callback function to create HTML result
	var _callback = function(e, feeds, options) {
		if (!feeds) {
			return false;
		}
		var html = '';	
		var row = 'odd';	
		
		// Add header if required
		if (options.header)
			html +=	'<div class="rssHeader">' +
				'<a href="'+feeds.link+'" title="'+ feeds.description +'" target="_blank">'+ 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();
			var pubDate = _timeFormat(entry.publishedDate);
			// Add feed row
			html += '<li class="rssRow '+row+'">' + 
				'<'+ options.titletag +'><a href="'+ entry.link +'" title="View this feed at '+ feeds.title +'" target="_blank">'+ entry.title +'</a></'+ options.titletag +'>'
			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>';
			}
			if (options.date) html += '<div>'+ pubDate +'</div>'			
			html += '</li>';
			
			// Alternate row classes
			if (row == 'odd') {
				row = 'even';
			} else {
				row = 'odd';
			}			
		}
		
		html += '</ul>' +
			'</div>'
		
		$(e).html(html);
	};
})(jQuery);