/*
 * 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: "atrás",
				suffixFromNow: "daqui",
				seconds: "menos de um minuto",
				minute: "cerca de um minuto",
				minutes: "%d minutos",
				hour: "cerca de uma hora",
				hours: "cerca de %d horas",
				day: "um dia",
				days: "%d dias",
				month: "cerca de um mês",
				months: "%d meses",
				year: "cerca de um ano",
				years: "%d anos",
				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) {
			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));