/*
 * timeago: a jQuery plugin, version: 0.9.3 (2011-01-21)
 * @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) 2008-2011, 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 : "a few seconds",
				minute : "1 minute",
				minutes : "%d minutes",
				hour : "an hour",
				hours : "about %d hours",
				day : "a day",
				days : "%d days",
				month : "a month",
				months : "%d months",
				year : "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;
				}
				distanceMillis = Math.abs(distanceMillis);
			}

			var seconds = 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) {
			refreshTimer = 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));