var TweetScroller = {
	currenttweet:0,
	results:null,
	tweets:null,
	interval:8,
	showtitle:1,
	title:'',
	showimage:1,
	showusername:1,
	parselinks:1,
	highlight:1,
	key:'',
	lang:'all',
	template:'%tweet.image%%tweet.title%<br><b>%tweet.username%, %tweet.timeago%:</b> %tweet.text%',
	txt_seconds:'s',
	txt_minutes:'m',
	txt_hours:'h',
	txt_days:'d',
	txt_ago:'ago',
	dateformat:'M jS, H:i',
	
	getTweets:function(uri){
		var sNode = document.createElement('script');
		sNode.type = 'text/javascript';
		sNode.charset='utf-8';
		sNode.src = uri;
		document.body.appendChild(sNode);	
	},
	
	initTweets:function(response){
		TweetScroller.tweets=response.results;
		for(var i=0;i<TweetScroller.tweets.length;i++){
			//preload images
			TweetScroller.tweets[i].profile_image=new Image();
			TweetScroller.tweets[i].profile_image.src=TweetScroller.tweets[i].profile_image_url;
			//create urls
			if(TweetScroller.parselinks!=0) TweetScroller.tweets[i].text=TweetScroller.createurl(TweetScroller.tweets[i].text);
			if(TweetScroller.highlight!=0) TweetScroller.tweets[i].text=TweetScroller.highlite(TweetScroller.tweets[i].text,TweetScroller.key);
			if(TweetScroller.highlight!=0) TweetScroller.tweets[i].text=TweetScroller.replaceusernames(TweetScroller.tweets[i].text);
			
		}
	
		TweetScroller.displayTweet(0,1,0);	
	},
	
	createurl:function(text)
	{
	    return text
	    .replace(/(ftp|http|https|file):\/\/[\S]+(\b|$)/gim,
	    '<a href="$&" class="my_link" target="_blank">$&</a>')
	    .replace(/([^\/])(www[\S]+(\b|$))/gim,
	    '$1<a href="http://$2" class="my_link" target="_blank">$2</a>');
	}, 
	
	highlite:function(text){
		return text.replace(/TweetScroller.key/gi,'<b>'+TweetScroller.key+'</b>');
	},
	
	replaceusernames:function(text){
		return text.replace(/@([a-z]+)/gi,'<a href="http://twitter.com/$1">@$1</a>');
	},

	displayTweet:function(tweetnum,divid,percent){
		if(tweetnum>=TweetScroller.tweets.length)tweetnum=0;
		if(TweetScroller.tweets.length==0){
			TweetScroller.displayEmptyTweet();
			return;
		}
		if(percent==0){
			var tweet=TweetScroller.tweets[tweetnum];
			var div_twitold=document.getElementById('twit'+(divid==1?2:1));
			var div_twitnew=document.getElementById('twit'+divid);
			div_twitold.style.zIndex=0;
			div_twitnew.style.zIndex=1;
			//div_twitnew.style.marginTop=48+'px';
			TweetScroller.setOpacity(div_twitnew,0);
			
			div_twitnew.innerHTML=TweetScroller.createTweetFromTemplate(tweet);
			
			percent=percent+10;
			setTimeout('TweetScroller.displayTweet('+(tweetnum)+','+divid+','+percent+')',50);
		}else if(percent<100){
			var div_twitnew=document.getElementById('twit'+divid);
			percent=percent+10;
			//div_twitnew.style.marginTop=(48-(0.48*percent))+'px';
			TweetScroller.setOpacity(div_twitnew,percent);
			setTimeout('TweetScroller.displayTweet('+(tweetnum)+','+divid+','+percent+')',50);
		}else {
			divid=(divid==1?2:1);
			setTimeout('TweetScroller.displayTweet('+(tweetnum+1)+','+divid+',0)',TweetScroller.interval*1000);
		}
	},
	
	createTweetFromTemplate:function(tweet){
		var username=(TweetScroller.showusername==0?'':tweet.from_user);
		var image=(TweetScroller.showimage==0?'':'<a href="http://twitter.com/'+tweet.from_user+'"><img id="tweetimage" src="'+tweet.profile_image_url+'" style="float:left;padding-right:5px;" width="48px" height="48px"></a>')
		var tweet_time=new Date(tweet.created_at);
		var timeago=TweetScroller.date2ago(tweet_time);
		
		
		var html=TweetScroller.template;
		html=html.replace('%tweet.title%',TweetScroller.title);
		html=html.replace('%tweet.image%',image);
		html=html.replace('%tweet.username%',username);
		html=html.replace('%tweet.text%',tweet.text);
		html=html.replace('%tweet.time%',tweet_time.format(TweetScroller.dateformat));
		html=html.replace('%tweet.timeago%',timeago);
		
		return html;
	},
	
	displayEmptyTweet:function(){
		var div_twitnew=document.getElementById('twit1');
		div_twitnew.style.zIndex=1;
		div_twitnew.innerHTML='No tweets found';
		TweetScroller.setOpacity(div_twitnew,100);
	},
	
	setOpacity:function(obj,value) {
		obj.style.opacity = value/10;
		obj.style.MozOpacity=value/10;
		obj.style.filter = 'alpha(opacity=' + value + ')';
	},

	date2ago:function(d){
		var now = new Date();
		var elap=(now-d)/1000;
		if(elap<60){
		    return(elap+' '+TweetScroller.txt_seconds+' '+TweetScroller.txt_ago);
		}else if(elap<3600){
		    return(parseInt(elap/60)+' '+TweetScroller.txt_minutes+' '+TweetScroller.txt_ago);
		}else if(elap<3600*24){
		    return(parseInt(elap/3600)+' '+TweetScroller.txt_hours+' '+TweetScroller.txt_ago);
		}else{
		    return(parseInt(elap/(86400))+' '+TweetScroller.txt_days+' '+TweetScroller.txt_ago);
		}		
	}
	
	
}

Date.prototype.format = function(format) {
	var returnStr = '';
	var replace = Date.replaceChars;
	for (var i = 0; i < format.length; i++) {
		var curChar = format.charAt(i);
		if (replace[curChar]) {
			returnStr += replace[curChar].call(this);
		} else {
			returnStr += curChar;
		}
	}
	return returnStr;
};
Date.replaceChars = {
	shortMonths: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
	longMonths: ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
	shortDays: ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],
	longDays: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
	
	// Day
	d: function() { return (this.getDate() < 10 ? '0' : '') + this.getDate(); },
	D: function() { return Date.replaceChars.shortDays[this.getDay()]; },
	j: function() { return this.getDate(); },
	l: function() { return Date.replaceChars.longDays[this.getDay()]; },
	N: function() { return this.getDay() + 1; },
	S: function() { return (this.getDate() % 10 == 1 && this.getDate() != 11 ? 'st' : (this.getDate() % 10 == 2 && this.getDate() != 12 ? 'nd' : (this.getDate() % 10 == 3 && this.getDate() != 13 ? 'rd' : 'th'))); },
	w: function() { return this.getDay(); },
	z: function() { return "Not Yet Supported"; },
	// Week
	W: function() { return "Not Yet Supported"; },
	// Month
	F: function() { return Date.replaceChars.longMonths[this.getMonth()]; },
	m: function() { return (this.getMonth() < 11 ? '0' : '') + (this.getMonth() + 1); },
	M: function() { return Date.replaceChars.shortMonths[this.getMonth()]; },
	n: function() { return this.getMonth() + 1; },
	t: function() { return "Not Yet Supported"; },
	// Year
	L: function() { return "Not Yet Supported"; },
	o: function() { return "Not Supported"; },
	Y: function() { return this.getFullYear(); },
	y: function() { return ('' + this.getFullYear()).substr(2); },
	// Time
	a: function() { return this.getHours() < 12 ? 'am' : 'pm'; },
	A: function() { return this.getHours() < 12 ? 'AM' : 'PM'; },
	B: function() { return "Not Yet Supported"; },
	g: function() { return this.getHours() % 12 || 12; },
	G: function() { return this.getHours(); },
	h: function() { return ((this.getHours() % 12 || 12) < 10 ? '0' : '') + (this.getHours() % 12 || 12); },
	H: function() { return (this.getHours() < 10 ? '0' : '') + this.getHours(); },
	i: function() { return (this.getMinutes() < 10 ? '0' : '') + this.getMinutes(); },
	s: function() { return (this.getSeconds() < 10 ? '0' : '') + this.getSeconds(); },
	// Timezone
	e: function() { return "Not Yet Supported"; },
	I: function() { return "Not Supported"; },
	O: function() { return (this.getTimezoneOffset() < 0 ? '-' : '+') + (this.getTimezoneOffset() / 60 < 10 ? '0' : '') + (this.getTimezoneOffset() / 60) + '00'; },
	T: function() { return "Not Yet Supported"; },
	Z: function() { return this.getTimezoneOffset() * 60; },
	// Full Date/Time
	c: function() { return "Not Yet Supported"; },
	r: function() { return this.toString(); },
	U: function() { return this.getTime() / 1000; }
};