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/*
 * Javascript Humane Dates
 * Copyright (c) 2008 Dean Landolt (deanlandolt.com)
 * Re-write by Zach Leatherman (zachleat.com)
 * 
 * Adopted from the John Resig's pretty.js
 * at http://ejohn.org/blog/javascript-pretty-date
 * and henrah's proposed modification 
 * at http://ejohn.org/blog/javascript-pretty-date/#comment-297458
 * 
 * Licensed under the MIT license.
 */

function humaneDate(date, compareTo){
    var lang = {
            ago: 'Ago',
            now: 'Just Now',
            minute: 'Minute',
            minutes: 'Minutes',
            hour: 'Hour',
            hours: 'Hours',
            day: 'Day',
            days: 'Days',
            week: 'Week',
            weeks: 'Weeks',
            month: 'Month',
            months: 'Months',
            year: 'Year',
            years: 'Years'
        },
        formats = [
            [60, lang.now],
            [3600, lang.minute, lang.minutes, 60], // 60 minutes, 1 minute
            [86400, lang.hour, lang.hours, 3600], // 24 hours, 1 hour
            [604800, lang.day, lang.days, 86400], // 7 days, 1 day
            [2628000, lang.week, lang.weeks, 604800], // ~1 month, 1 week
            [31536000, lang.month, lang.months, 2628000], // 1 year, ~1 month
            [Infinity, lang.year, lang.years, 31536000] // Infinity, 1 year
        ],
        isString = typeof date == 'string',
        date = isString ?
                    new Date(('' + date).replace(/-/g,"/").replace(/[TZ]/g," ")) :
                    date,
        compareTo = compareTo || new Date,
        seconds = (compareTo - date +
                        (compareTo.getTimezoneOffset() -
                            // if we received a GMT time from a string, doesn't include time zone bias
                            // if we got a date object, the time zone is built in, we need to remove it.
                            (isString ? 0 : date.getTimezoneOffset())
                        ) * 60000
                    ) / 1000,
        token;

    if(seconds < 0) {
        seconds = Math.abs(seconds);
        token = '';
    } else {
        token = ' ' + lang.ago;
    }

    /*
     * 0 seconds && < 60 seconds        Now
     * 60 seconds                       1 Minute
     * > 60 seconds && < 60 minutes     X Minutes
     * 60 minutes                       1 Hour
     * > 60 minutes && < 24 hours       X Hours
     * 24 hours                         1 Day
     * > 24 hours && < 7 days           X Days
     * 7 days                           1 Week
     * > 7 days && < ~ 1 Month          X Weeks
     * ~ 1 Month                        1 Month
     * > ~ 1 Month && < 1 Year          X Months
     * 1 Year                           1 Year
     * > 1 Year                         X Years
     * 
     * Single units are +10%. 1 Year shows first at 1 Year + 10%
     */

    function normalize(val, single)
    {
        var margin = 0.1;
        if(val >= single && val <= single * (1+margin)) {
            return single;
        }
        return val;
    }

    for(var i = 0, format = formats[0]; formats[i]; format = formats[++i]) {
        if(seconds < format[0]) {
            if(i === 0) {
                // Now
                return format[1];
            }

            var val = Math.ceil(normalize(seconds, format[3]) / (format[3]));
            return val + 
                    ' ' +
                    (val != 1 ? format[2] : format[1]) +
                    (i > 0 ? token : '');
        }
    }
};

if(typeof jQuery != 'undefined') {
    jQuery.fn.humaneDates = function()
    {
        return this.each(function()
        {
            var $t = jQuery(this),
                date = humaneDate($t.attr('title'));

            if(date && $t.html() != date) {
                // don't modify the dom if we don't have to
                $t.html(date);
            }
        });
    };
}