/**

* 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 1.4.1
* @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) 2008-2013, Ryan McGeary (ryan -[at]- mcgeary [*dot*] org)
*/

(function (factory) {

if (typeof define === 'function' && define.amd) {
  // AMD. Register as an anonymous module.
  define(['jquery'], factory);
} else {
  // Browser globals
  factory(jQuery);
}

}(function ($) {

$.timeago = function(timestamp) {
  if (timestamp instanceof Date) {
    return inWords(timestamp);
  } else if (typeof timestamp === "string") {
    return inWords($.timeago.parse(timestamp));
  } else if (typeof timestamp === "number") {
    return inWords(new Date(timestamp));
  } else {
    return inWords($.timeago.datetime(timestamp));
  }
};
var $t = $.timeago;

$.extend($.timeago, {
  settings: {
    refreshMillis: 60000,
    allowPast: true,
    allowFuture: false,
    localeTitle: false,
    cutoff: 0,
    strings: {
      prefixAgo: null,
      prefixFromNow: null,
      suffixAgo: "ago",
      suffixFromNow: "from now",
      inPast: 'any moment 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",
      wordSeparator: " ",
      numbers: []
    }
  },

  inWords: function(distanceMillis) {
    if(!this.settings.allowPast && ! this.settings.allowFuture) {
        throw 'timeago allowPast and allowFuture settings can not both be set to false.';
    }

    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;
      }
    }

    if(!this.settings.allowPast && distanceMillis >= 0) {
      return this.settings.strings.inPast;
    }

    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 = $l.wordSeparator || "";
    if ($l.wordSeparator === undefined) { separator = " "; }
    return $.trim([prefix, words, suffix].join(separator));
  },

  parse: function(iso8601) {
    var s = $.trim(iso8601);
    s = s.replace(/\.\d+/,""); // remove milliseconds
    s = s.replace(/-/,"/").replace(/-/,"/");
    s = s.replace(/T/," ").replace(/Z/," UTC");
    s = s.replace(/([\+\-]\d\d)\:?(\d\d)/," $1$2"); // -04:00 -> -0400
    s = s.replace(/([\+\-]\d\d)$/," $100"); // +09 -> +0900
    return new Date(s);
  },
  datetime: function(elem) {
    var iso8601 = $t.isTime(elem) ? $(elem).attr("datetime") : $(elem).attr("title");
    return $t.parse(iso8601);
  },
  isTime: function(elem) {
    // jQuery's `is()` doesn't play well with HTML5 in IE
    return $(elem).get(0).tagName.toLowerCase() === "time"; // $(elem).is("time");
  }
});

// functions that can be called via $(el).timeago('action')
// init is default when no action is given
// functions are called with context of a single element
var functions = {
  init: function(){
    var refresh_el = $.proxy(refresh, this);
    refresh_el();
    var $s = $t.settings;
    if ($s.refreshMillis > 0) {
      this._timeagoInterval = setInterval(refresh_el, $s.refreshMillis);
    }
  },
  update: function(time){
    var parsedTime = $t.parse(time);
    $(this).data('timeago', { datetime: parsedTime });
    if($t.settings.localeTitle) $(this).attr("title", parsedTime.toLocaleString());
    refresh.apply(this);
  },
  updateFromDOM: function(){
    $(this).data('timeago', { datetime: $t.parse( $t.isTime(this) ? $(this).attr("datetime") : $(this).attr("title") ) });
    refresh.apply(this);
  },
  dispose: function () {
    if (this._timeagoInterval) {
      window.clearInterval(this._timeagoInterval);
      this._timeagoInterval = null;
    }
  }
};

$.fn.timeago = function(action, options) {
  var fn = action ? functions[action] : functions.init;
  if(!fn){
    throw new Error("Unknown function name '"+ action +"' for timeago");
  }
  // each over objects here and call the requested function
  this.each(function(){
    fn.call(this, options);
  });
  return this;
};

function refresh() {
  var data = prepareData(this);
  var $s = $t.settings;

  if (!isNaN(data.datetime)) {
    if ( $s.cutoff == 0 || Math.abs(distance(data.datetime)) < $s.cutoff) {
      $(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 = $.trim(element.text());
    if ($t.settings.localeTitle) {
      element.attr("title", element.data('timeago').datetime.toLocaleString());
    } else if (text.length > 0 && !($t.isTime(element) && element.attr("title"))) {
      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");

}));