var ForumDateReplacer = Class.create();

ForumDateReplacer.prototype = {
    initialize: function() {
        this.months = [
        'January',
        'February',
        'March',
        'April',
        'May',
        'June',
        'July',
        'August',
        'September',
        'October',
        'November',
        'December'
        ]
    },
	
    go: function() {
        var midnight = this.getMidnight();
        var lastLogin = this.readCookie('last_login');
        if (lastLogin!=null) {
            lastLogin = new Date(lastLogin*1000);
        }
        $$('.replacable_date').each( function(elem) {
            var date = new Date(Date.parse(elem.collectTextNodes()));
            var offset = this.getDayOffset(date, midnight);
            if (offset<=1) {
                elem.update(this.forumDate(date, offset));
            }
            if (this.isNewPost(date, lastLogin)) {
                elem.insert('<img class="new_image" src="/images/furniture/nubike2005/misc/new.png" alt="new" />');
            }
        }.bind(this));
    },
	
    isNewPost: function(date, lastLogin) {
        if (lastLogin==null) {
            return false;
        } else {
            return date.getTime() > lastLogin.getTime();
        }
    },
	
    getMidnight: function() {
        var midnight = new Date();
        midnight.setMinutes(0);
        midnight.setHours(0);
        midnight.setSeconds(0);
        return midnight;
    },
	
    getDayOffset: function(time, midnight) {
        if (time.getTime() >= midnight.getTime()) {
            return 0;
        } else {
            return Math.ceil((midnight.getTime() - time.getTime())/86400000);
        }
    },
	
    readCookie: function(name) {
        var nameEQ = name + "=";
        var ca = document.cookie.split(';');
        for(var i=0;i < ca.length;i++) {
            var c = ca[i];
            while (c.charAt(0)==' ') c = c.substring(1,c.length);
            if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
        }
        return null;
    },
	
    forumDate: function(date, offset) {
        if (offset==0) {
            return '<b>Today</b> at ' + this.twoDigits(date.getHours()) + ':' + this.twoDigits(date.getMinutes());
        } else if (offset==1) {
            return '<b>Yesterday</b> at ' + this.twoDigits(date.getHours()) + ':' + this.twoDigits(date.getMinutes());
        } else {
            return this.twoDigits(date.getDate()) + ' ' + months[date.getMonth()] + ', ' + date.getFullYear() + ' ' + this.twoDigits(date.getHours()) + ':' + this.twoDigits(date.getMinutes());
        }
    },

    twoDigits: function(digits) {
        if (digits<10) {
            digits = '0' + digits;
        }
        return digits;
    }
}

document.observe("dom:loaded", function() { 
    var replacer = new ForumDateReplacer(); replacer.go();
});