// When the document is loaded (jQuery function)
$(document).ready(function() {
    // Call the Twitter API to retrieve the last 10 tweets in JSON format for the pcpro Twitter account
    $.getJSON("http://twitter.com/statuses/user_timeline.json?screen_name=pavilionbelfast&count=10&callback=?", function(tweetdata) {
        // Grab a reference to the ul element which will display the tweets
        var tl = $("#tweet-list");
        // For each item returned in tweetdata
        $.each(tweetdata, function(i, tweet) {
            // Append the info in li tags to the ul, converting any links to HTML <a href=.. code and convert the tweeted date
            // to a more readable Twitter format
            tl.append("<li>&ldquo;" + urlToLink(tweet.text) + "&rdquo;&ndash; " + relTime(tweet.created_at) + "</li>");
        });
    });
});

// Converts any links in text to their HTML <a href=""> equivalent
function urlToLink(text) {
    var exp = /(\b(https?|ftp|file):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/ig;
    return text.replace(exp, "<a target='_blank' href='$1'>$1</a>");
}

// Takes a time value and converts it to "from now" and then returns a relevant text interpretation of it
function relTime(time_value) {
    time_value = time_value.replace(/(\+[0-9]{4}\s)/ig, "");
    var parsed_date = Date.parse(time_value);
    var relative_to = (arguments.length > 1) ? arguments[1] : new Date();
    var timeago = parseInt((relative_to.getTime() - parsed_date) / 1000);
    if (timeago < 60) return 'less than a minute ago';
    else if (timeago < 120) return 'about a minute ago';
    else if (timeago < (45 * 60)) return (parseInt(timeago / 60)).toString() + ' minutes ago';
    else if (timeago < (90 * 60)) return 'about an hour ago';
    else if (timeago < (24 * 60 * 60)) return 'about ' + (parseInt(timeago / 3600)).toString() + ' hours ago';
    else if (timeago < (48 * 60 * 60)) return '1 day ago';
    else return (parseInt(timeago / 86400)).toString() + ' days ago';
}