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

	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.box = new Element('div').setProperty('id', 'boxcontain').injectInside(this.center);
        this.closeButton = new Element('a').setProperties({
            id: 'lbCloseLink',
            href: '#'
        }).injectInside(this.box)
        this.closeButton.onclick = this.overlay.onclick = this.close.bind(this);

        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.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){

        if(this.options.descriptions){
            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;
    }

};

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