/**
 * Timeago is a jQuery plugin that makes it easy to support automatically
 * updating fuzzy timestamps (e.g. "4 minutes ago" or "about 1 day ago").
 *
 * @name timeago
 * @version 0.11.1
 * @requires jQuery v1.2.3+
 * @author Ryan McGeary
 * @license MIT License - http://www.opensource.org/licenses/mit-license.php
 *
 * For usage and examples, visit:
 * http://timeago.yarp.com/
 *
 * Copyright (c) 2008-2011, Ryan McGeary (ryanonjavascript -[at]- mcgeary [*dot*] org)
 */
(function($) {
  $.timeago = function(timestamp) {
    if (timestamp instanceof Date) {
      return inWords(timestamp);
    } else if (typeof timestamp === "string") {
      return inWords($.timeago.parse(timestamp));
    } else {
      return inWords($.timeago.datetime(timestamp));
    }
  };
  var $t = $.timeago;

  $.extend($.timeago, {
    settings: {
      refreshMillis: 60000,
      allowFuture: false,
      strings: {
        prefixAgo: null,
        prefixFromNow: null,
        suffixAgo: gettext("ago"),
        suffixFromNow: gettext("from now"),
        seconds: gettext("just now"),
        minute: gettext("about a minute"),
        minutes: gettext("%d min"),
        hour: gettext("about an hour"),
        hours: gettext("%d h"),
        day: gettext("yesterday"),
        days: gettext("%d days"),
        month: gettext("about a month"),
        months: gettext("%d months"),
        year: gettext("about a year"),
        years: gettext("%d years"),
        wordSeparator: " ",
        numbers: []
      }
    },
    inWords: function(distanceMillis) {
      var $l = this.settings.strings;
      var prefix = $l.prefixAgo;
      var suffix = $l.suffixAgo;
      if (this.settings.allowFuture) {
        if (distanceMillis < 0) {
          prefix = $l.prefixFromNow;
          suffix = $l.suffixFromNow;
        }
      }

      var seconds = Math.abs(distanceMillis) / 1000;
      var minutes = seconds / 60;
      var hours = minutes / 60;
      var days = hours / 24;
      var years = days / 365;

      function substitute(stringOrFunction, number) {
        var string = $.isFunction(stringOrFunction) ? stringOrFunction(number, distanceMillis) : stringOrFunction;
        var value = ($l.numbers && $l.numbers[number]) || number;
        return string.replace(/%d/i, value);
      }

      var words = seconds < 45 && substitute($l.seconds, Math.round(seconds)) ||
        seconds < 90 && substitute($l.minute, 1) ||
        minutes < 45 && substitute($l.minutes, Math.round(minutes)) ||
        minutes < 90 && substitute($l.hour, 1) ||
        hours < 24 && substitute($l.hours, Math.round(hours)) ||
        hours < 42 && substitute($l.day, 1) ||
        days < 30 && substitute($l.days, Math.round(days)) ||
        days < 45 && substitute($l.month, 1) ||
        days < 365 && substitute($l.months, Math.round(days / 30)) ||
        years < 1.5 && substitute($l.year, 1) ||
        substitute($l.years, Math.round(years));

      var separator = $l.wordSeparator === undefined ?  " " : $l.wordSeparator;
      return $.trim([prefix, words, suffix].join(separator));
    },
    parse: function(iso8601) {
      var s = $.trim(iso8601);
      s = s.replace(/\.\d\d\d+/,""); // remove milliseconds
      s = s.replace(/-/,"/").replace(/-/,"/");
      s = s.replace(/T/," ").replace(/Z/," UTC");
      s = s.replace(/([\+\-]\d\d)\:?(\d\d)/," $1$2"); // -04:00 -> -0400
      return new Date(s);
    },
    datetime: function(elem) {
      // jQuery's `is()` doesn't play well with HTML5 in IE
      var isTime = $(elem).get(0).tagName.toLowerCase() === "time"; // $(elem).is("time");
      var iso8601 = isTime ? $(elem).attr("datetime") : $(elem).attr("title");
      return $t.parse(iso8601);
    }
  });

  $.fn.timeago = function() {
    var self = this;
    self.each(refresh);

    var $s = $t.settings;
    if ($s.refreshMillis > 0) {
      setInterval(function() { self.each(refresh); }, $s.refreshMillis);
    }
    return self;
  };

  function refresh() {
    var data = prepareData(this);
    if (!isNaN(data.datetime)) {
      $(this).text(inWords(data.datetime));
    }
    return this;
  }

  function prepareData(element) {
    element = $(element);
    if (!element.data("timeago")) {
      element.data("timeago", { datetime: $t.datetime(element) });
      var text = $.trim(element.text());
      if (text.length > 0) {
        element.attr("title", text);
      }
    }
    return element.data("timeago");
  }

  function inWords(date) {
    var distanceMillis = distance(date);
    var seconds = Math.abs(distanceMillis) / 1000;
    var minutes = seconds / 60;
    var hours = minutes / 60;
    var days = hours / 24;
    var years = days / 365;
    var months = [
        gettext('Jan'),
        gettext('Feb'),
        gettext('Mar'),
        gettext('Apr'),
        gettext('May'),
        gettext('Jun'),
        gettext('Jul'),
        gettext('Aug'),
        gettext('Sep'),
        gettext('Oct'),
        gettext('Nov'),
        gettext('Dec')
    ];
    //todo: rewrite this in javascript
    if (days > 2){
        var month_date = months[date.getMonth()] + ' ' + date.getDate()
        if (years == 0){
            //how to do this in js???
            return month_date;
        } else {
            return month_date + ' ' + "'" + date.getYear() % 20;
        }
    } else if (days == 2) {
        return gettext('2 days ago')
    } else if (days == 1) {
        return gettext('yesterday')
    } else if (minutes >= 60) {
        var wholeHours = Math.floor(hours);
        return interpolate(
                    ngettext(
                        '%s hour ago',
                        '%s hours ago',
                        wholeHours
                    ),
                    [wholeHours,]
                )
    } else if (seconds > 90){
        var wholeMinutes = Math.floor(minutes);
        return interpolate(
                    ngettext(
                        '%s min ago',
                        '%s mins ago',
                        wholeMinutes
                    ),
                    [wholeMinutes,]
                )
    } else {
        return gettext('just now')
    }
  }

  function distance(date) {
    return (new Date() - date);
  }

  // fix for IE6 suckage
  document.createElement("abbr");
  document.createElement("time");
}(jQuery));
