/*
Yetii - Yet (E)Another Tab Interface Implementation
version 1.6
http://www.kminek.pl/lab/yetii/
Copyright (c) Grzegorz Wojcik
Code licensed under the BSD License:
http://www.kminek.pl/bsdlicense.txt
*/

function Yetii() {

        this.defaults = {

                id: null,
                active: 1,
                interval: null,
                wait: null,
                persist: null,
                tabclass: 'tab',
                activeclass: 'active',
                callback: null,
                leavecallback: null

        };

        this.activebackup = null;

        for (var n in arguments[0]) { this.defaults[n]=arguments[0][n]; };

        this.getTabs = function() {

        var retnode = [];
        var elem = document.getElementById(this.defaults.id).getElementsByTagName('*');

                var regexp = new RegExp("(^|\\s)" + this.defaults.tabclass.replace(/\-/g, "\\-") + "(\\s|$)");

        for (var i = 0; i < elem.length; i++) {
                        if (regexp.test(elem[i].className)) retnode.push(elem[i]);
        }

        return retnode;

    };

        this.links = document.getElementById(this.defaults.id + '-nav').getElementsByTagName('a');
        this.listitems = document.getElementById(this.defaults.id + '-nav').getElementsByTagName('li');

        this.show = function(number) {

        for (var i = 0; i < this.tabs.length; i++) {

                        this.tabs[i].style.display = ((i+1)==number) ? 'block' : 'none';

                        if ((i+1)==number) {
                                this.addClass(this.links[i], this.defaults.activeclass);
                                this.addClass(this.listitems[i], this.defaults.activeclass + 'li');
                        } else {
                                this.removeClass(this.links[i], this.defaults.activeclass);
                                this.removeClass(this.listitems[i], this.defaults.activeclass + 'li');
                        }

                }


                if (this.defaults.leavecallback && (number != this.activebackup)) this.defaults.leavecallback(this.defaults.active);

                this.activebackup = number;


                this.defaults.active = number;

                if (this.defaults.callback) this.defaults.callback(number);


    };

        this.rotate = function(interval) {

        this.show(this.defaults.active);
        this.defaults.active++;

        if (this.defaults.active > this.tabs.length) this.defaults.active = 1;


        var self = this;

                if (this.defaults.wait) clearTimeout(this.timer2);

        this.timer1 = setTimeout(function(){self.rotate(interval);}, interval*1000);

    };

        this.next = function() {

        var _target = (this.defaults.active + 1 > this.tabs.length) ? 1 : this.defaults.active + 1;
        this.show(_target);
        this.defaults.active = _target;

    };

        this.previous = function() {

        var _target = ((this.defaults.active - 1) == 0) ? this.tabs.length : this.defaults.active - 1;
        this.show(_target);
        this.defaults.active = _target;

    };

        this.previous = function() {

                this.defaults.active--;
            if(!this.defaults.active) this.defaults.active = this.tabs.length;
                this.show(this.defaults.active);

        };

        this.gup = function(name) {
                name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
                var regexS = "[\\?&]"+name+"=([^&#]*)";
                var regex = new RegExp( regexS );
                var results = regex.exec( window.location.href );
                if (results == null) return null;
                else return results[1];
        };

        this.parseurl = function(tabinterfaceid) {

                var result = this.gup(tabinterfaceid);

                if (result==null) return null;
                if (parseInt(result)) return parseInt(result);
                if (document.getElementById(result)) {
                        for (var i=0;i<this.tabs.length;i++) {
                                if (this.tabs[i].id == result) return (i+1);
                        }
                }

                return null;

        };

        this.createCookie = function(name,value,days) {
                if (days) {
                        var date = new Date();
                        date.setTime(date.getTime()+(days*24*60*60*1000));
                        var expires = "; expires="+date.toGMTString();
                }
                else var expires = "";
                document.cookie = name+"="+value+expires+"; path=/";
        };

        this.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;
        };

        this.contains = function(el, item, from) {
                return el.indexOf(item, from) != -1;
        };

        this.hasClass = function(el, className){
                return this.contains(el.className, className, ' ');
        };

        this.addClass = function(el, className){
                if (!this.hasClass(el, className)) el.className = (el.className + ' ' + className).replace(/\s{2,}/g, ' ').replace(/^\s+|\s+$/g, '');
        };

        this.removeClass = function(el, className){
                el.className = el.className.replace(new RegExp('(^|\\s)' + className + '(?:\\s|$)'), '$1');
                el.className.replace(/\s{2,}/g, ' ').replace(/^\s+|\s+$/g, '');
        };


        this.tabs = this.getTabs();
        this.defaults.active = (this.parseurl(this.defaults.id)) ? this.parseurl(this.defaults.id) : this.defaults.active;
        if (this.defaults.persist && this.readCookie(this.defaults.id)) this.defaults.active = this.readCookie(this.defaults.id);
        this.activebackup = this.defaults.active;
        this.show(this.defaults.active);

        var self = this;
        for (var i = 0; i < this.links.length; i++) {
        this.links[i].customindex = i+1;
        this.links[i].onclick = function(){

                if (self.timer1) clearTimeout(self.timer1);
                if (self.timer2) clearTimeout(self.timer2);

                self.show(this.customindex);
                if (self.defaults.persist) self.createCookie(self.defaults.id, this.customindex, 0);

                if (self.defaults.wait) self.timer2 = setTimeout(function(){self.rotate(self.defaults.interval);}, self.defaults.wait*1000);

                return false;
        };
    }

        if (this.defaults.interval) this.rotate(this.defaults.interval);

};