var MOOdalBox = {
    // init the MOOdalBox
    init: function (options) {
        // init default options
        this.options = Object.extend({
            resizeDuration: 400,    // Duration of height and width resizing (ms)
            initialWidth: 250,        // Initial width of the box (px)
            initialHeight: 250,        // Initial height of the box (px)
            defaultWidth: 500,        // Default width of the box (px)
            defaultHeight: 400,        // Default height of the box (px)
            animateCaption: true    // Enable/Disable caption animation
        }, options || {});
        // scan anchors for those opening a MOOdalBox
        this.anchors = [];
        $A($$( 'a' )).each(function(el){
            if(el.rel && el.href && el.rel.test('^moodalbox', 'i')) {
                el.onclick = this.click.pass(el, this);
                this.anchors.push(el);
            }
        }, this);
        // add event listener 
        this.eventKeyDown = this.keyboardListener.bindAsEventListener(this);
        this.eventPosition = this.position.bind(this);
        // init the HTML elements
        // the overlay (clickable to close)
        this.overlay = new Element('div').setProperty('id', 'mb_overlay').injectInside(document.body).setStyle('z-index','500000');
        // the center element
        this.center = new Element('div').setProperty('id', 'mb_center').setStyles({width: this.options.initialWidth+'px', height: this.options.initialHeight+'px', marginLeft: '-'+(this.options.initialWidth/2)+'px', display: 'none'}).injectInside(document.body).setStyle('z-index','500001');
        // the actual page contents
        this.contents = new Element('div').setProperty('id', 'mb_contents').injectInside(this.center);
        // the bottom part (caption / close)
        this.bottom = new Element('div').setProperty('id', 'mb_bottom').setStyle('display', 'none').injectInside(document.body).setStyle('z-index','500001');
        new Element('a').setProperties({id: 'mb_close_link', href: '#'}).injectInside(this.bottom).onclick = this.overlay.onclick = this.close.bind(this);
        this.caption = new Element('div').setProperty('id', 'mb_caption').injectInside(this.bottom);
        new Element('div').setStyle('clear', 'both').injectInside(this.bottom);
        // init the effects
        var nextEffect = this.nextEffect.bind(this);
        this.fx = {
            overlay: this.overlay.effect('opacity', { duration: 500 }).hide(),
            resize: this.center.effects({ duration: this.options.resizeDuration, onComplete: nextEffect }),
            contents: this.contents.effect('opacity', { duration: 500, onComplete: nextEffect }),
            bottom: this.bottom.effects({ duration: 400, onComplete: nextEffect })
        };
    },
    click: function(link) {
        return this.open (link.href, link.title, link.rel);
    },
    open: function(sLinkHref, sLinkTitle, sLinkRel) {
        this.href = sLinkHref;
        this.title = sLinkTitle;
        this.rel = sLinkRel;
        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.loadContents(sLinkHref);
    },
    position: function() {
        this.overlay.setStyles({top: Window.getScrollTop()+'px', height: Window.getHeight()+'px'});
    },
    setup: function(open) {
        var elements = $A($$('object'));
        elements.extend($$(window.ActiveXObject ? 'select' : 'embed'));
        elements.each(function(el){ el.style.visibility = open ? 'hidden' : ''; });
        var fn = open ? 'naddEvent' : '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;
        }
    },
    loadContents: function() {        
        if(this.step) return false;
        this.step = 1;
        // check to see if there are specified dimensions or fall back to defaults
        var aDim = this.rel.match(/[0-9]+/g);
        this.options.contentsWidth = (aDim && (aDim[0] > 0)) ? aDim[0] : this.options.defaultWidth;
        this.options.contentsHeight = (aDim && (aDim[1] > 0)) ? aDim[1] : this.options.defaultHeight;
        this.bottom.setStyles({opacity: '0', height: '0px', display: 'none'});
        this.center.className = 'mb_loading';
        this.fx.contents.hide();
        // AJAX call here
        var nextEffect = this.nextEffect.bind(this);
        var ajaxLoad = new Ajax(this.href, {method: 'get', update: this.contents, onComplete: nextEffect, onStateChange: this.ajaxStateChange}).request();
        return false;
    },
    ajaxStateChange: function (){
        // error handling still needs some tweaking
        if (this.transport.readyState != 4) return;
        var status;
        try { status = this.transport.status; } catch(e) { status = 0; }
        if ((status >= 200) && (status < 300)){
            //succes
        } else {
                // oops.. something's gone wrong !
                //alert ("There was a problem loading your page.nPlease try again.");
            }    
        this.transport.onreadystatechange = Class.empty;
    },
    nextEffect: function() {
        switch(this.step++) {
        case 1:
            this.center.className = '';
            this.caption.setHTML(this.title);
            this.contents.setStyles ({width: this.options.contentsWidth + "px", height: this.options.contentsHeight + "px"});
            if(this.center.clientHeight != this.contents.offsetHeight) {
                this.fx.resize.custom({height: [this.center.clientHeight, this.contents.offsetHeight]});
                break;
            }
            this.step++;
        case 2:
            if(this.center.clientWidth != this.contents.offsetWidth) {
                this.fx.resize.custom({width: [this.center.clientWidth, this.contents.offsetWidth], marginLeft: [-this.center.clientWidth/2, -this.contents.offsetWidth/2]});
                break;
            }
            this.step++;
        case 3:
            this.bottom.setStyles({top: (this.top + this.center.clientHeight)+'px', width: this.contents.style.width, marginLeft: this.center.style.marginLeft, display: ''});
            this.fx.contents.custom(0,1);
            break;
        case 4:
            if(this.options.animateCaption) {
                this.fx.bottom.custom({opacity: [0, 1], height: [0, this.bottom.scrollHeight]});
                break;
            }
            this.bottom.setStyles({opacity: '1', height: this.bottom.scrollHeight+'px'});
        case 5:
            this.step = 0;
        }
    },
    close: function() {
        if(this.step < 0) return;
        this.step = -1;
        for(var f in this.fx) this.fx[f].clearTimer();
        this.center.style.display = this.bottom.style.display = 'none';
        this.fx.overlay.chain(this.setup.pass(false, this)).start(0);
        return false;
    }
};
window.naddEvent( 'domready', (MOOdalBox.init.bind(MOOdalBox)));