/*

* timeago: a jQuery plugin, version: 0.9 (2010-06-21)
* @requires jQuery v1.2.3 or later
*
* 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").
*
* For usage and examples, visit:
* http://timeago.yarp.com/
*
* Licensed under the MIT:
* http://www.opensource.org/licenses/mit-license.php
*
* Copyright (c) 2008-2010, 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: "ago",
      suffixFromNow: "from now",
      seconds: "less than a minute",
      minute: "about a minute",
      minutes: "%d minutes",
      hour: "about an hour",
      hours: "about %d hours",
      day: "a day",
      days: "%d days",
      month: "about a month",
      months: "%d months",
      year: "about a year",
      years: "%d years",
      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;
      }
      distanceMillis = Math.abs(distanceMillis);
    }

    var seconds = distanceMillis / 1000;
    var minutes = seconds / 60;
    var hours = minutes / 60;
    var days = hours / 24;
    var years = days / 365;

    function substitute(stringOrFunction, number) {
      var string = $.isFunction(stringOrFunction) ? stringOrFunction(number) : stringOrFunction;
      var value = ($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($l.hours, Math.round(hours)) ||
      hours < 48 && substitute($l.day, 1) ||
      days < 30 && substitute($l.days, Math.floor(days)) ||
      days < 60 && substitute($l.month, 1) ||
      days < 365 && substitute($l.months, Math.floor(days / 30)) ||
      years < 2 && substitute($l.year, 1) ||
      substitute($l.years, Math.floor(years));

    return $.trim([prefix, words, suffix].join(" "));
  },
  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) {
  return $t.inWords(distance(date));
}

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

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

})(jQuery);