// Constants defined here can be changed for easy config / translation
// (defined as vars, because of MSIE's lack of support for const)

var _ERROR_MESSAGE = "Oops.. there was a problem with your request.<br /><br />" +
                    "Please try again.<br /><br />" +
                    "<em>Click anywhere to close.</em>"; // the error message displayed when the request has a problem
var _RESIZE_DURATION        = 0;      // Duration of height and width resizing (ms)
var _INITIAL_WIDTH          = 755;      // Initial width of the box (px)
var _INITIAL_HEIGHT         = 530;      // Initial height of the box (px)
var _CONTENTS_WIDTH         = 695;      // Actual width of the box (px)
var _CONTENTS_HEIGHT        = 470;      // Actual height of the box (px)
var _DEF_CONTENTS_WIDTH     = 715;      // Default width of the box (px) - used for resetting when a different setting was used
var _DEF_CONTENTS_HEIGHT    = 490;      // Default height of the box (px) - used for resetting when a different setting was used
var _ANIMATE_CAPTION        = -1;        // Enable/Disable caption animation
var _EVAL_SCRIPTS           = false;    // Option to evaluate scripts in the response text
var _EVAL_RESPONSE          = false;    // Option to evaluate the whole response text

// The MOOdalBox object in its beauty
var MOOdalBox = {

    // init the MOOdalBox
    init: function (options) {

        // init default options
        this.options = Object.extend({
            resizeDuration:     _RESIZE_DURATION,
            initialWidth:       _INITIAL_WIDTH,
            initialHeight:      _INITIAL_HEIGHT,
            contentsWidth:      _CONTENTS_WIDTH,
            contentsHeight:     _CONTENTS_HEIGHT,
            defContentsWidth:   _DEF_CONTENTS_WIDTH,
            defContentsHeight:  _DEF_CONTENTS_HEIGHT,
            animateCaption:     _ANIMATE_CAPTION,
            evalScripts:        _EVAL_SCRIPTS,
            evalResponse:       _EVAL_RESPONSE
        }, options || {});

        // scan anchors for those opening a MOOdalBox
        this.anchors = [];
        $A($$('a')).each(function(el){
            // we use a regexp to check for links that
            // have a rel attribute starting with "moodalbox"
            if(el.rel && el.href && el.rel.test('^moodalbox', 'i')) {
                el.onclick = this.click.pass(el, this);
                this.anchors.push(el);
            }
        }, this);

        // add event listeners
        this.eventKeyDown = this.keyboardListener.bindWithEvent(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);
        // 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);
        // 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);
        this.closelink = new Element('a').setProperties({id: 'mb_close_link', href: '#'}).injectInside(this.bottom);
        this.caption = new Element('div').setProperty('id', 'mb_caption').injectInside(this.bottom);
        new Element('div').setStyle('clear', 'both').injectInside(this.bottom);

        this.error = new Element('div').setProperty('id', 'mb_error').set('html',_ERROR_MESSAGE);

        // attach the close event to the close button / the overlay
        this.closelink.onclick = this.overlay.onclick = this.close.bind(this);

        // init the effects
        var nextEffect = this.nextEffect.bind(this);
        this.fx = {
            overlay:    new Fx.Tween(this.overlay, {property: "opacity", duration: 500}).set(0),
            resize:     new Fx.Morph(this.center, $extend({duration: this.options.resizeDuration, onComplete: nextEffect}, this.options.resizeTransition ? {transition: this.options.resizeTransition} : {})),
            contents:   new Fx.Tween(this.contents, {property: "opacity", duration: 500, onComplete: nextEffect}),
            bottom:     new Fx.Morph(this.bottom, $extend({duration: 400, onComplete: nextEffect}, this.options.resizeTransition ? {transition: this.options.resizeTransition} : {}))
        };

        this.ajaxRequest = Class.empty;

    },

    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 ? 'addEvent' : 'removeEvent';
        window[fn]('scroll', this.eventPosition)[fn]('resize', this.eventPosition);
        document[fn]('keydown', this.eventKeyDown);
        this.step = 0;
    },

    loadContents: function() {
        if(this.step) return false;
        this.step = 1;

        // check to see if there are specified dimensions
        // if not, fall back to default values
        var aDim = this.rel.match(/[0-9]+/g);
        this.options.contentsWidth = (aDim && (aDim[0] > 0)) ? aDim[0] : this.options.defContentsWidth;
        this.options.contentsHeight = (aDim && (aDim[1] > 0)) ? aDim[1] : this.options.defContentsHeight;

        this.bottom.setStyles({opacity: '0', height: '0px', display: 'none'});
        this.center.className = 'mb_loading';

        this.fx.contents.set(0);

        // AJAX call here
        var nextEffect = this.nextEffect.bind(this);
        var ajaxFailure = this.ajaxFailure.bind(this);
        var ajaxOptions = {
            method:         'get',
            url:            this.href,
            update:         this.contents,
            evalScripts:    this.options.evalScripts,
            evalResponse:   this.options.evalResponse,
            onComplete:     nextEffect,
            onFailure:      ajaxFailure
            };
        this.ajaxRequest = new Request.HTML(ajaxOptions).send();

        return false;
    },

    ajaxFailure: function (){
        this.contents.set('html','');
        this.error.clone().injectInside(this.contents);
        this.nextEffect();
        this.center.setStyle('cursor', 'pointer');
        this.bottom.setStyle('cursor', 'pointer');
        this.center.onclick = this.bottom.onclick = this.close.bind(this);
    },

    nextEffect: function() {
        switch(this.step++) {
        case 1:
            // remove previous styling from the elements
            // (e.g. styling applied in case of an error)
            this.center.className = '';
            this.center.setStyle('cursor', 'default');
            this.bottom.setStyle('cursor', 'default');
            this.center.onclick = this.bottom.onclick = '';
            this.caption.set('html',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.start({height: this.contents.offsetHeight});
                this.nextEffect();
                break;
            }
            this.step++;

        case 2:
            if(this.center.clientWidth != this.contents.offsetWidth) {
                //this.fx.resize.start({width: this.contents.offsetWidth, marginLeft: -this.contents.offsetWidth/2});
                this.nextEffect();
                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.start(1);
            break;

        case 4:
            if(this.options.animateCaption < 0) { break; }
            if(this.options.animateCaption) {
                this.fx.bottom.start({opacity: 1, height: this.bottom.scrollHeight});
                break;
            }
            this.bottom.setStyles({opacity: '1', height: this.bottom.scrollHeight+'px'});
        case 5:

            this.step = 0;
        }
    },


    keyboardListener: function(event) {
        // close the MOOdalBox when the user presses CTRL + W, CTRL + X, ESC
        if ((event.control && event.key == 'w') || (event.control && event.key == 'x') || (event.key == 'esc')) {
            this.close();
            event.stop();
        }
    },

    close: function() {
        if(this.step < 0) return false;
        this.step = -1;
        for(var f in this.fx) this.fx[f].cancel();
        this.center.style.display = this.bottom.style.display = 'none';
        this.center.className = 'mb_loading';
        this.fx.overlay.chain(this.setup.pass(false, this)).start(0);
        return false;
    }

};

// startup
window.addEvent('domready', MOOdalBox.init.bind(MOOdalBox));