/*
 * timeago: a jQuery plugin, version: 0.8.2 (2010-02-16)
 * @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(jQuery) {
  jQuery.timeago = function(timestamp) {
    if (timestamp instanceof Date) return inWords(timestamp);
    else if (typeof timestamp == "string") return inWords(jQuery.timeago.parse(timestamp));
    else return inWords(jQuery.timeago.datetime(timestamp));
  };
  var jQueryt = jQuery.timeago;

  jQuery.extend(jQuery.timeago, {
    settings: {
      refreshMillis: 60000,
      allowFuture: false,
      strings: {
        prefixAgo: null,
        prefixFromNow: null,
        suffixAgo: "ago",
        suffixFromNow: "from now",
        ago: null, // DEPRECATED, use suffixAgo
        fromNow: null, // DEPRECATED, use suffixFromNow
        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"
      }
    },
    inWords: function(distanceMillis) {
      var jQueryl = this.settings.strings;
      var prefix = jQueryl.prefixAgo;
      var suffix = jQueryl.suffixAgo || jQueryl.ago;
      if (this.settings.allowFuture) {
        if (distanceMillis < 0) {
          prefix = jQueryl.prefixFromNow;
          suffix = jQueryl.suffixFromNow || jQueryl.fromNow;
        }
        distanceMillis = Math.abs(distanceMillis);
      }

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

      var words = seconds < 45 && substitute(jQueryl.seconds, Math.round(seconds)) ||
        seconds < 90 && substitute(jQueryl.minute, 1) ||
        minutes < 45 && substitute(jQueryl.minutes, Math.round(minutes)) ||
        minutes < 90 && substitute(jQueryl.hour, 1) ||
        hours < 24 && substitute(jQueryl.hours, Math.round(hours)) ||
        hours < 48 && substitute(jQueryl.day, 1) ||
        days < 30 && substitute(jQueryl.days, Math.floor(days)) ||
        days < 60 && substitute(jQueryl.month, 1) ||
        days < 365 && substitute(jQueryl.months, Math.floor(days / 30)) ||
        years < 2 && substitute(jQueryl.year, 1) ||
        substitute(jQueryl.years, Math.floor(years));

      return jQuery.trim([prefix, words, suffix].join(" "));
    },
    parse: function(iso8601) {
      var s = jQuery.trim(iso8601);
      s = s.replace(/-/,"/").replace(/-/,"/");
      s = s.replace(/T/," ").replace(/Z/," UTC");
      s = s.replace(/([\+-]\d\d)\:?(\d\d)/," jQuery1jQuery2"); // -04:00 -> -0400
      return new Date(s);
    },
    datetime: function(elem) {
      // jQuery's `is()` doesn't play well with HTML5 in IE
      var isTime = jQuery(elem).get(0).tagName.toLowerCase() == "time"; // jQuery(elem).is("time");
      var iso8601 = isTime ? jQuery(elem).attr("datetime") : jQuery(elem).attr("title");
      return jQueryt.parse(iso8601);
    }
  });

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

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

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

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

  function inWords(date) {
    return jQueryt.inWords(distance(date));
  }

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

  function substitute(stringOrFunction, value) {
    var string = jQuery.isFunction(stringOrFunction) ? stringOrFunction(value) : stringOrFunction;
    return string.replace(/%d/i, value);
  }

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