/*
 * 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($) {
     $.timeago = function(timestamp) {
	 if (timestamp instanceof Date) return inWords(timestamp);
	 else if (typeof timestamp == "string") return inWords($.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",
		 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 $l = this.settings.strings;
	     var prefix = $l.prefixAgo;
	     var suffix = $l.suffixAgo || $l.ago;
	     if (this.settings.allowFuture) {
		 if (distanceMillis < 0) {
		     prefix = $l.prefixFromNow;
		     suffix = $l.suffixFromNow || $l.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($l.seconds, Math.round(seconds)) ||
		 seconds < 90 && substitute($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(/-/,"/").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());
     }

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

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