/*
        Slimbox v1.41 - The ultimate lightweight Lightbox clone
        by Christophe Beyls (http://www.digitalia.be) - MIT-style license.
        Inspired by the original Lightbox v2 by Lokesh Dhakar.
*/

var Lightbox = {

        init: function(options){
                this.options = $extend({
                        resizeDuration: 400,
                        resizeTransition: false,        // default transition
                        initialWidth: 250,
                        initialHeight: 250,
                        animateCaption: true,
                        showCounter: true
                }, options || {});

                this.anchors = [];
                $each(document.links, function(el){
                        if (el.rel && el.rel.test(/^lightbox/i)){
                                el.onclick = this.click.pass(el, this);
                                this.anchors.push(el);
                        }
                }, this);
                this.eventKeyDown = this.keyboardListener.bindAsEventListener(this);
                this.eventPosition = this.position.bind(this);

                this.overlay = new Element('div', {'id': 'lbOverlay'}).injectInside(document.body);

                this.center = new Element('div', {'id': 'lbCenter', 'styles': {'width': this.options.initialWidth, 'height': this.options.initialHeight, 'marginLeft': -(this.options.initialWidth/2), 'display': 'none'}}).injectInside(document.body);
                this.image = new Element('div', {'id': 'lbImage'}).injectInside(this.center);
                this.prevLink = new Element('a', {'id': 'lbPrevLink', 'href': '#', 'styles': {'display': 'none'}}).injectInside(this.image);
                this.nextLink = this.prevLink.clone().setProperty('id', 'lbNextLink').injectInside(this.image);
                this.prevLink.onclick = this.previous.bind(this);
                this.nextLink.onclick = this.next.bind(this);

                this.bottomContainer = new Element('div', {'id': 'lbBottomContainer', 'styles': {'display': 'none'}}).injectInside(document.body);
                this.bottom = new Element('div', {'id': 'lbBottom'}).injectInside(this.bottomContainer);
                new Element('a', {'id': 'lbCloseLink', 'href': '#'}).injectInside(this.bottom).onclick = this.overlay.onclick = this.close.bind(this);
                this.caption = new Element('div', {'id': 'lbCaption'}).injectInside(this.bottom);
                this.number = new Element('div', {'id': 'lbNumber'}).injectInside(this.bottom);
                new Element('div', {'styles': {'clear': 'both'}}).injectInside(this.bottom);

                var nextEffect = this.nextEffect.bind(this);
                this.fx = {
                        overlay: this.overlay.effect('opacity', {duration: 500}).hide(),
                        resize: this.center.effects($extend({duration: this.options.resizeDuration, onComplete: nextEffect}, this.options.resizeTransition ? {transition: this.options.resizeTransition} : {})),
                        image: this.image.effect('opacity', {duration: 500, onComplete: nextEffect}),
                        bottom: this.bottom.effect('margin-top', {duration: 400, onComplete: nextEffect})
                };

                this.preloadPrev = new Image();
                this.preloadNext = new Image();
        },

        click: function(link){
                if (link.rel.length == 8) return this.show(link.href, link.title);

                var j, imageNum, images = [];
                this.anchors.each(function(el){
                        if (el.rel == link.rel){
                                for (j = 0; j < images.length; j++) if(images[j][0] == el.href) break;
                                if (j == images.length){
                                        images.push([el.href, el.title]);
                                        if (el.href == link.href) imageNum = j;
                                }
                        }
                }, this);
                return this.open(images, imageNum);
        },

        show: function(url, title){
                return this.open([[url, title]], 0);
        },

        open: function(images, imageNum){
                this.images = images;
                this.position();
                this.setup(true);
                this.top = window.getScrollTop() + (window.getHeight() / 15);
                this.center.setStyles({top: this.top, display: ''});
                this.fx.overlay.start(0.8);
                return this.changeImage(imageNum);
        },

        position: function(){
                this.overlay.setStyles({'top': window.getScrollTop(), 'height': window.getHeight()});
        },

        setup: function(open){
                var elements = $A(document.getElementsByTagName('object'));
                elements.extend(document.getElementsByTagName(window.ie ? 'select' : 'embed'));
                elements.each(function(el){
                        if (open) el.lbBackupStyle = el.style.visibility;
                        el.style.visibility = open ? 'hidden' : el.lbBackupStyle;
                });
                var fn = open ? 'addEvent' : 'removeEvent';
                window[fn]('scroll', this.eventPosition)[fn]('resize', this.eventPosition);
                document[fn]('keydown', this.eventKeyDown);
                this.step = 0;
        },

        keyboardListener: function(event){
                switch (event.keyCode){
                        case 27: case 88: case 67: this.close(); break;
                        case 37: case 80: this.previous(); break;
                        case 39: case 78: this.next();
                }
        },

        previous: function(){
                return this.changeImage(this.activeImage-1);
        },

        next: function(){
                return this.changeImage(this.activeImage+1);
        },

        changeImage: function(imageNum){
                if (this.step || (imageNum < 0) || (imageNum >= this.images.length)) return false;
                this.step = 1;
                this.activeImage = imageNum;

                this.bottomContainer.style.display = this.prevLink.style.display = this.nextLink.style.display = 'none';
                this.fx.image.hide();
                this.center.className = 'lbLoading';

                this.preload = new Image();
                this.preload.onload = this.nextEffect.bind(this);
                this.preload.src = this.images[imageNum][0];
                return false;
        },

        nextEffect: function(){
                switch (this.step++){
                case 1:
                        this.center.className = '';
                        this.image.style.backgroundImage = 'url('+this.images[this.activeImage][0]+')';
                        this.image.style.width = this.bottom.style.width = this.preload.width+'px';
                        this.image.style.height = this.prevLink.style.height = this.nextLink.style.height = this.preload.height+'px';

                        this.caption.setHTML(this.images[this.activeImage][1] || '');
                        this.number.setHTML((!this.options.showCounter || (this.images.length == 1)) ? '' : 'Foto '+(this.activeImage+1)+' von '+this.images.length);

                        if (this.activeImage) this.preloadPrev.src = this.images[this.activeImage-1][0];
                        if (this.activeImage != (this.images.length - 1)) this.preloadNext.src = this.images[this.activeImage+1][0];
                        if (this.center.clientHeight != this.image.offsetHeight){
                                this.fx.resize.start({height: this.image.offsetHeight});
                                break;
                        }
                        this.step++;
                case 2:
                        if (this.center.clientWidth != this.image.offsetWidth){
                                this.fx.resize.start({width: this.image.offsetWidth, marginLeft: -this.image.offsetWidth/2});
                                break;
                        }
                        this.step++;
                case 3:
                        this.bottomContainer.setStyles({top: this.top + this.center.clientHeight, height: 0, marginLeft: this.center.style.marginLeft, display: ''});
                        this.fx.image.start(1);
                        break;
                case 4:
                        if (this.options.animateCaption){
                                this.fx.bottom.set(-this.bottom.offsetHeight);
                                this.bottomContainer.style.height = '';
                                this.fx.bottom.start(0);
                                break;
                        }
                        this.bottomContainer.style.height = '';
                case 5:
                        if (this.activeImage) this.prevLink.style.display = '';
                        if (this.activeImage != (this.images.length - 1)) this.nextLink.style.display = '';
                        this.step = 0;
                }
        },

        close: function(){
                if (this.step < 0) return;
                this.step = -1;
                if (this.preload){
                        this.preload.onload = Class.empty;
                        this.preload = null;
                }
                for (var f in this.fx) this.fx[f].stop();
                this.center.style.display = this.bottomContainer.style.display = 'none';
                this.fx.overlay.chain(this.setup.pass(false, this)).start(0);
                return false;
        }
};

window.addEvent('domready', Lightbox.init.bind(Lightbox));