/*
* 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: "moments",
                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);