/*
	---
	
	description: Twittar Class. Request a users' recent tweets and displays them

	author:
	- Simon Smith - http://blink-design.net

	requires:
	- core/1.4.1:*
	- more:1.4.0.1:Request.JSONP

	provides: [Twittar]

	...
	*/

	var Twittar = new Class({
		
		Implements : [ Options, Events ],
		
		initialize : function( username, element, options ) {

			this.setOptions( options );

			this.username = username;
			this.element = $( element );
			this.url = this.formatUrl();
			
			this.request = new Request.JSONP({
				url : this.url,
				method : 'get',
				timeout : 5000,
				onRequest : function() {
					this.fireEvent('request', [ this.element ]);
				}.bind( this ),
				onTimeout : function() {
					this.fireEvent('timeout', [ this.element ]);
				}.bind( this ),
				onComplete : this.buildTweets.bind( this )
			});

		},
		 
		options : {
			twitterUrl : 'https://api.twitter.com/1/statuses/user_timeline.json?&exclude_replies={replies}&contributor_details={contributerDetails}&include_rts={retweets}&screen_name={username}&count={count}',
			showRetweets : true,
			showReplies : true,
			contributerDetails : false,
			tweetCount : 5,
			showUserInfo : true,
			userInfoElement : 'a',
			onComplete : function( element, container ) {
			
				element.grab( container );

			}
		},
		
		formatUrl : function() {

			var options = this.options;

			return options.twitterUrl.substitute({
				retweets : options.showRetweets,
				replies : options.showReplies,
				count : options.tweetCount,
				contributerDetails : options.contributerDetails,
				username : this.username
			});

		},
		
		linkify : function(text) {

			// Pinched from - http://goo.gl/HMk15
			return text.replace(/(https?:\/\/\S+)/gi,'<a href="$1">$1</a>')
				   .replace(/(^|\s)@(\w+)/g,'$1<a href="http://twitter.com/$2">@$2</a>')
				   .replace(/(^|\s)#(\w+)/g,'$1#<a href="http://search.twitter.com/search?q=%23$2">$2</a>');

		},
		
		getTweets : function() {

			this.request.send();				

			return this;

		},
		
		formatTweetDate : function( dateStr ) {

			// http://goo.gl/p3qd4
			dateStr = dateStr.replace(/^\w+ (\w+) (\d+) ([\d:]+) \+0000 (\d+)$/, '$1 $2 $4 $3 UTC');
			return new Date( dateStr ).toUTCString();

		},
		
		formatTweetLink : function( user, id ) {

			return 'http://twitter.com/{user}/status/{id}'.substitute({
				user : user,
				id : id
			});

		},
		
		buildTweets : function( tweets ) {

			if ( tweets.length == 0 ) return;

			var list = new Element('ul'),
				container = new Element('div', { 'class' : 'tweets' });
				
			if ( this.options.showUserInfo ) {
				
				container.grab( new Element(this.options.userInfoElement, {
					'class' : 'twitter-user',
					text : '@' + tweets[0].user.screen_name,
					href : 'http://twitter.com/' + tweets[0].user.screen_name
				}), 'top');
				
			}	

			Object.each( tweets, function( item ) {

				var element = new Element('li', {
					'class' : 'tweet'
				}),
				tweet = new Element('span', {
					'class' : 'tweet-text',
					html : this.linkify( item.text )
				}),
				date = new Element('a', {
					'class' : 'tweet-date',
					text : this.formatTweetDate( item.created_at ),
					href : this.formatTweetLink( item.user.screen_name, item.id_str )
				});
				
				element.grab( tweet ).grab( date ).inject( list );
				list.inject( container );

			}, this);

			this.fireEvent('complete', [ this.element, container, list, list.getChildren(), tweets ]);

		}
		
	});