/* http://pastie.org/260450 */
 (function($) {
    $.fn.relatizeDate = function() {
        return $(this).each(function() {
            $(this).text($.relatizeDate(this))
        })
    }

    $.relatizeDate = function(element) {
      if($(element).text() != "")
        return $.relatizeDate.timeAgoInWords(new Date($(element).text()), true)
    }

    // shortcut
    $r = $.relatizeDate

    $.extend($.relatizeDate, {
        shortDays: ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],
        days: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
        shortMonths: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
        months: ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],

        /**
* Given a formatted string, replace the necessary items and return.
* Example: Time.now().strftime("%B %d, %Y") => February 11, 2008
* @param {String} format The formatted string used to format the results
*/
        strftime: function(date, format) {
            var day = date.getDay(),
            month = date.getMonth();
            var hours = date.getHours(),
            minutes = date.getMinutes();

            var pad = function(num) {
                var string = num.toString(10);
                return new Array((2 - string.length) + 1).join('0') + string
            };

            return format.replace(/\%([aAbBcdHImMpSwyY])/g,
            function(part) {
                switch (part.charAt(1)) {
                case 'a':
                    return $r.shortDays[day];
                    break;
                case 'A':
                    return $r.days[day];
                    break;
                case 'b':
                    return $r.shortMonths[month];
                    break;
                case 'B':
                    return $r.months[month];
                    break;
                case 'c':
                    return date.toString();
                    break;
                case 'd':
                    return pad(date.getDate());
                    break;
                case 'H':
                    return pad(hours);
                    break;
                case 'I':
					if(hours == 0)
						return pad(12);
                    return pad((hours + 12) % 12);
                    break;
                case 'm':
                    return pad(month + 1);
                    break;
                case 'M':
                    return pad(minutes);
                    break;
                case 'p':
                    return hours > 12 ? 'PM': 'AM';
                    break;
                case 'S':
                    return pad(date.getSeconds());
                    break;
                case 'w':
                    return day;
                    break;
                case 'y':
                    return pad(date.getFullYear() % 100);
                    break;
                case 'Y':
                    return date.getFullYear().toString();
                    break;
                }
            })
        },

        timeAgoInWords: function(targetDate, includeTime) {
            return $r.distanceOfTimeInWords(targetDate, new Date(), includeTime);
        },

        /**
* Return the distance of time in words between two Date's
* Example: '5 days ago', 'about an hour ago'
* @param {Date} fromTime The start date to use in the calculation
* @param {Date} toTime The end date to use in the calculation
* @param {Boolean} Include the time in the output
*/
        distanceOfTimeInWords: function(fromTime, toTime, includeTime) {
            var delta = parseInt((toTime.getTime() - fromTime.getTime()) / 1000);
            if (delta < 60) {
                return 'less than a minute ago';
            } else if (delta < 120) {
                return 'about a minute ago';
            } else if (delta < (45 * 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 {
                var days = (parseInt(delta / 86400)).toString();
                if (days > 5) {
                    var fmt = '%B %d, %Y'
                    if (includeTime) fmt += ' %I:%M %p'
                    return $r.strftime(fromTime, fmt);
                } else {
                    return days + " days ago"
                }
            }
        }
    })
})(jQuery);