/*
 * timeago: a jQuery plugin, version: 0.7.1 (2009-02-18)
 * @requires jQuery v1.2 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) 2008-2009, 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($.timeago.parse($(timestamp).attr("title")));
    };
    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"
                */
                /*
                days: "%d days",
                month: "more than a month",
                months: "more than a month",
                year: "more than a month",
                years: "more than a month"
                */
                days: "more than a day",
                month: "more than a day",
                months: "more than a day",
                year: "more than a day",
                years: "more than a day"
            }
        },
        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);
        }
    });

    $.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 date = $t.parse(this.title);
        if (!isNaN(date)) {
            $(this).text(inWords(date));
        }
        return this;
    }

    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
    if ($.browser.msie && $.browser.version < 7.0) {
        document.createElement('abbr');
    }
})(jQuery);