/**************************************************************

        Script          : Lightbox
        Version         : 1.5
        Authors         : Samuel Birch
        Desc            : Extended version of Slimbox
        Licence         : Open Source MIT Licence

**************************************************************/

var Lightbox = {

        init: function(options){
                this.options = Object.extend({
                        resizeDuration: 400,
                        resizeTransition: Fx.Transitions.sineInOut,
                        initialWidth: 250,
                        initialHeight: 250,
                        animateCaption: {In:true,Out:true},
                        container: document.body,
                        showControls: false,
                        showNumbers: true,
                        descriptions: false,
                        opacity: 0.8
                }, 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').setProperty('id', 'lbOverlay').injectInside(this.options.container);

                this.center = new Element('div').setProperty('id', 'lbCenter').setStyles({width: this.options.initialWidth+'px', height: this.options.initialHeight+'px', marginLeft: '-'+(this.options.initialWidth/2)+'px', display: 'none'}).injectInside(this.options.container);
                this.image = new Element('div').setProperty('id', 'lbImage').injectInside(this.center);
                
                this.bottomContainer = new Element('div').setProperty('id', 'lbBottomContainer').setStyle('display', 'none').injectInside(this.options.container);
                this.bottom = new Element('div').setProperty('id', 'lbBottom').injectInside(this.bottomContainer);
                
                if(this.options.showControls){
                        this.controlDiv = new Element('div').setProperty('id','lbControls').injectInside(this.bottom);
                }else{
                        this.controlDiv = this.image;
                }
                this.prevLink = new Element('a').setProperties({id: 'lbPrevLink', href: '#'}).setStyle('display', 'none').injectInside(this.controlDiv);
                this.nextLink = this.prevLink.clone().setProperty('id', 'lbNextLink').injectInside(this.controlDiv);
                this.prevLink.onclick = this.previous.bind(this);
                this.nextLink.onclick = this.next.bind(this);

                this.closeButton = new Element('a').setProperties({id: 'lbCloseLink', href: '#'}).injectInside(this.bottom)
                this.closeButton.onclick = this.overlay.onclick = this.close.bind(this);
                
                this.caption = new Element('div').setProperty('id', 'lbCaption').injectInside(this.bottom);
                if(this.options.descriptions != false){
                        this.options.descriptions = $$(this.options.descriptions);
                        this.description = new Element('div').setProperty('id', 'lbDescription').injectInside(this.bottom);
                }
                if(this.options.showNumbers){
                        this.number = new Element('div').setProperty('id', 'lbNumber').injectInside(this.bottom);
                }
                new Element('div').setStyle('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({duration: this.options.resizeDuration, transition: this.options.resizeTransition, onComplete: nextEffect}),
                        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){
        
                this.options.descriptions.each(function(el,i){
                        if(el.hasClass(link.id)){
                                this.linkLoc = i;
                        }
                },this);
                                
                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.window = {};
                this.window.height = window.getScrollHeight();
                this.window.width = window.getScrollWidth();
                this.window.top = window.getScrollTop();
                this.window.left = window.getScrollLeft();
                this.center.setStyles({top: this.top+'px', display: ''});
                this.fx.overlay.start(this.options.opacity);
                return this.changeImage(imageNum);
        },

        position: function(){ 
                if(this.options.container == document.body){ 
                        var h = window.getScrollHeight()+'px'; 
                        var w = window.getScrollWidth()+'px';
                        this.overlay.setStyles({top: '0px', height: h, width: w}); 
                }else{ 
                        var myCoords = this.options.container.getCoordinates(); 
                        this.overlay.setStyles({
                                top: myCoords.top+'px', 
                                height: myCoords.height+'px', 
                                left: myCoords.left+'px', 
                                width: myCoords.width+'px'
                        }); 
                } 
        },

        setup: function(open){
                var elements = $A(document.getElementsByTagName('object'));
                if (window.ie) elements.extend(document.getElementsByTagName('select'));
                elements.each(function(el){ el.style.visibility = open ? 'hidden' : ''; });
                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(){
                this.linkLoc --;
                return this.changeImage(this.activeImage-1);
        },

        next: function(){
                this.linkLoc ++;
                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;
                if(this.options.animateCaption.In && this.bottom.offsetHeight){
                        this.prevLink.style.display = this.nextLink.style.display = 'none';
                        this.bottom.effect('margin-top', {duration: 300, onComplete: this.loadImage.bind(this)}).start(-this.bottom.offsetHeight);
                }else{
                        this.bottomContainer.style.display = this.prevLink.style.display = this.nextLink.style.display = 'none';
                        this.loadImage();
                }
                this.fx.image.hide();
                this.center.className = 'lbLoading';
                
                return false;
        },
        
        loadImage: function(){
                this.preload = new Image();
                this.preload.onload = this.nextEffect.bind(this);
                this.preload.src = this.images[this.activeImage][0];
        },

        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';
                        if(this.options.showControls){
                                this.image.style.height = this.preload.height+'px';
                        }else{
                                this.image.style.height = this.prevLink.style.height = this.nextLink.style.height = this.preload.height+'px';
                        }

                        this.caption.setHTML(this.images[this.activeImage][1] || '');
                        if(this.options.descriptions != false){
                                if(this.description.getFirst()){this.description.getFirst().remove()};
                                var cl = this.options.descriptions[this.linkLoc].clone();
                                cl.setStyle('display', 'block').injectInside(this.description);
                        }
                        if(this.options.showNumbers){
                                this.number.setHTML((this.images.length == 1) ? '' : 'Image '+(this.activeImage+1)+' of '+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)+'px', height: '0px', marginLeft: this.center.style.marginLeft, display: ''});
                        this.fx.image.start(1);
                        var extra = this.caption.getStyle('height').toInt();
                        if(this.options.descriptions != false){extra += this.description.getStyle('height').toInt()}
                        if(this.options.showControls){extra += this.controlDiv.getStyle('height').toInt()}
                        if(this.options.showNumbers){extra += this.number.getStyle('height').toInt()}
                        var num = (extra-(this.closeButton.getStyle('height').toInt()*2));
                        if(num < 0){num=0}
                        this.closeButton.setStyle('marginTop', num+'px');
                        if(this.activeImage != 0) this.prevLink.style.display = '';
                        if(this.activeImage != (this.images.length - 1)) this.nextLink.style.display = '';
                        break;
                case 4:
                        if (this.options.animateCaption.Out){
                                this.fx.bottom.set(-this.bottom.offsetHeight);
                                this.bottomContainer.style.height = '';
                                this.fx.bottom.start(0);
                                break;
                        }
                        this.bottomContainer.style.height = '';
                case 5:
                        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);
                this.overlay.setStyles({height: this.window.height+'px', width: this.window.width+'px'});
                return false;
        }

};

/*************************************************************/