var tweets;
var tweetTimes;
var tweetIdx = 0;
var tweetDivId = 'tweet_container'

var TWEET_DWELL_TIME = 5000;

function cycleTweet()
{
    var tweetHTML = "";
    if (tweets.length > 0)
    {
        if (tweetIdx >= tweets.length)
        {
            tweetIdx = 0;
        }
        
        tweetHTML = "<p class='tweet_text'>"+tweets[tweetIdx]+"</p><p class='tweet_time'>"+tweetTimes[tweetIdx]+"</p>";
        
        tweetIdx++;
    }
    $(tweetDivId).fadeOut(function() {
        $(this).html(tweetHTML).fadeIn();
    });
    
    setTimeout("cycleTweet()", TWEET_DWELL_TIME);
}

function relative_time(time_value)
{
    var values = time_value.split(" ");
    time_value = values[1] + " " + values[2] + ", " + values[5] + " " + values[3];
    var parsed_date = Date.parse(time_value);
    var relative_to = (arguments.length > 1) ? arguments[1] : new Date();
    var delta = parseInt((relative_to.getTime() - parsed_date) / 1000);
    delta = delta + (relative_to.getTimezoneOffset() * 60);
  
    if (delta < 60) {
        return 'less than a minute ago';
    } else if(delta < 120) {
        return 'about a minute ago';
    } else if(delta < (60*60)) {
        return (parseInt(delta / 60)).toString() + ' minutes ago';
    } else if(delta < (120*60)) {
        return 'about an hour ago';
    } else if(delta < (24*60*60)) {
        return 'about ' + (parseInt(delta / 3600)).toString() + ' hours ago';
    } else if(delta < (48*60*60)) {
        return '1 day ago';
    } else {
        return (parseInt(delta / 86400)).toString() + ' days ago';
    }
}

function twitterCallback(data)
{   
    // step through each tweet
    $.each(data, function(i, item) {
        var statusText = item.text;
        // replace links, twitter user names and hash tags with html links
        statusText = statusText.replace(/((https?|s?ftp|ssh)\:\/\/[^"\s\<\>]*[^.,;'">\:\s\<\>\)\]\!])/g, function(url) {
                return '<a target="_blank" href="'+url+'">'+url+'</a>';
            }).replace(/(^|\s)@(\w+)/g, '$1@<a target="_blank" href="http://www.twitter.com/$2">$2</a>').replace(/(^|\s)#(\w+)/g, '$1#<a target="_blank" href="http://search.twitter.com/search?q=%23$2">$2</a>');
        
        // add the tweet text to the array
        tweets.push(statusText);
        // add some time info to the time array
        tweetTimes.push(relative_time(item.created_at));
    });
    
    tweetIdx = 0;
    cycleTweet();
}

function updateTweets(user_id, count, divCSS)
{
    tweets = new Array();
    tweetTimes = new Array();
    
    tweetDivId = divCSS;
    
    var twitter_user_status_url = 'http://twitter.com/statuses/user_timeline/'+user_id+'.json?count='+count+'&callback=?';

    $.getJSON(twitter_user_status_url, twitterCallback);
}