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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 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) 2008-2015, 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() {

    //check if it's still visible

    if(!$.contains(document.documentElement,this)){

      //stop if it has been removed

      $(this).timeago("dispose");

      return this;

    }

    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");

}));