// All credit goes to Rick Olson. (function($) {

$.fn.relatizeDate = function() {
  return $(this).each(function() {
    if ($(this).hasClass( 'relatized' )) return
    $(this).text( $.relatizeDate(this) ).addClass( 'relatized' )
  })
}

$.relatizeDate = function(element) {
  return $.relatizeDate.timeAgoInWords( new Date($(element).text()) )
}

// 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[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': 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, 10);
    if (delta < 60) {
        return 'just now';
    } else if (delta < 120) {
        return 'about a minute ago';
    } else if (delta < (45*60)) {
        return (parseInt(delta / 60, 10)).toString() + ' minutes ago';
    } else if (delta < (120*60)) {
        return 'about an hour ago';
    } else if (delta < (24*60*60)) {
        return 'about ' + (parseInt(delta / 3600, 10)).toString() + ' hours ago';
    } else if (delta < (48*60*60)) {
        return '1 day ago';
    } else {
      var days = (parseInt(delta / 86400, 10)).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);