/*
	Slimbox v1.3 - The ultimate lightweight Lightbox clone
	by Christophe Beyls (http://www.digitalia.be) - MIT-style license.
	Inspired by the original Lightbox v2 by Lokesh Dhakar.
*/
// JEJ - added function getDownloadFromImageUrl on Lightbox.  Set this to a function to compute from the image
// url a url from where you can download the image.  The lightbox will then show a link at the bottom to this url.

var Lightbox = {

    init: function(options) {
        this.options = Object.extend({
            resizeDuration: 400,
            resizeTransition: Fx.Transitions.sineInOut,
            initialWidth: 250,
            initialHeight: 250,
            animateCaption: 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').setProperty('id', 'lbOverlay').injectInside(document.body);

        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(document.body);
        this.image = new Element('div').setProperty('id', 'lbImage').injectInside(this.center);
        this.prevLink = new Element('a').setProperties({ id: 'lbPrevLink', href: '#' }).setStyle('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').setProperty('id', 'lbBottomContainer').setStyle('display', 'none').injectInside(document.body);
        this.bottom = new Element('div').setProperty('id', 'lbBottom').injectInside(this.bottomContainer);
        new Element('a').setProperties({ id: 'lbCloseLink', href: '#' }).injectInside(this.bottom).onclick = this.overlay.onclick = this.close.bind(this);
        this.caption = new Element('div').setProperty('id', 'lbCaption').injectInside(this.bottom);
        this.number = new Element('div').setProperty('id', 'lbNumber').injectInside(this.bottom);
        this.download = new Element('a').setProperties({ id: 'lbDownload', href: '#' }).setStyle('display', 'none').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 (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 + 'px', display: '' });
        this.fx.overlay.start(0.8);
        return this.changeImage(imageNum);
    },

    position: function() {
        this.overlay.setStyles({ top: window.getScrollTop() + 'px', height: window.getHeight() + '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() {
        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.images.length == 1) ? '' : 'Image ' + (this.activeImage + 1) + ' of ' + this.images.length);
                if (this.getDownloadFromImageUrl) {
                    this.download.href = this.getDownloadFromImageUrl(this.images[this.activeImage][0]);
                    this.download.style.display = '';
                    this.download.setHTML('Download');
                }

                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);
                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;
    },

    getDownloadFromImageUrl: null
};

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