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

    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: 0,
            resizeTransition: false,
            initialWidth: 250,
            initialHeight: 250,
            animateCaption: {In:false,Out:false},
            container: document.body,
            showControls: false,
            showNumbers: true,
            descriptions: false,
            opacity: 0.4
        }, 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: 0}).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: 0, onComplete: nextEffect}),
            bottom: this.bottom.effect('margin-top', {duration: 0, 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.top = 20;
        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';
            if (window.ie) { 
                h = window.getScrollHeight()-4+'px'; 
               w = window.getScrollWidth()-20+'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);
    },
    
    next2: function(step){
        this.linkLoc = this.linkLoc+step;
        return this.changeImage(this.activeImage+step);
    },

    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 (window.ie) {
		 this.image.style.width = this.preload.width+20+'px';
	    }
            if(this.options.showControls){
		if (window.ie) {
                    this.image.style.height = this.preload.height+15+'px';
		} else {
	            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.innerHTML = '';
                var nav = '';//<a href="#" id="lbPrevLink" class="nav_link"><</a> &nbsp;&nbsp;';
                this.prevLink = new Element('a').setProperties({id: 'lbPrevLink', href: '#'}).setHTML("<font class='nav_arrow'><&nbsp;&nbsp;&nbsp;</font>").injectInside(this.number);
                this.prevLink.onclick = this.previous.bind(this);
                for (var i=0; i<this.images.length; i++) {
                    if (i != this.activeImage) {
                        //nav += i+1;
                        var link = new Element('a').setProperties({id: 'link', href: '#'}).setHTML("" + (i+1) + "").injectInside(this.number);
                        link.onclick = this.next2.pass(i - this.activeImage, this);
                    } else {
                        var curr = new Element('font').setProperties({id: 'current_item'}).setHTML((i+1)).injectInside(this.number);
                    }
                    if (i < this.images.length-1) {
                        var dot = new Element('font').setHTML('. ').injectInside(this.number);
                    }
                }
                //new Element('span').setHTML(nav).injectInside(this.number);
                this.nextLink = new Element('a').setProperties({id: 'lbNextLink', href: '#'}).setHTML("<font class='nav_arrow'>&nbsp;&nbsp;&nbsp;></font>").injectInside(this.number);
                this.nextLink.onclick = this.next.bind(this);
            }

            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);
        if (window.ie) { 
            this.overlay.setStyles({height: this.window.height-4+'px', width: this.window.width-20+'px'});
        } else {
            this.overlay.setStyles({height: this.window.height+'px', width: this.window.width+'px'});
        }
        return false;
    }

};