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/**

 * 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 0.10.0

 * @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: "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;

        }

      }

      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 < 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));