/*
        Slimbox (Extended Version 1.3.1, 2007-02-21)
        by Yukio Arita (http://homepage.mac.com/yukikun/software/slimbox_ex/)
        -         Support to show external content using iframe.
        -         Support to set content size. You can add width/height parameters
                in rev attribute of the anchor url.
                ex1) <a href="image.jpg" rev="width=50%, height=50%" rel="lightbox">
                                <img src="image_thumb.jpg" alt="image"></a>
                ex2) <a href="text.html" rev="width=500, height=300" rel="lightbox">
                                some text here</a>
        -         Some rendering problem with IE6 is fixed. Now you can use Slimbox in
                valid XHTML document with XML prolog.
        - Of course, license is same as original.

        Based on:
        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.
*/

var Lightbox = {
        init: function(options){
                this.options = Object.extend({
                        resizeDuration: 400,
                        resizeTransition:Fx.Transitions.Back.easeOut,
                        initialWidth: 50,
                        initialHeight: 50,
                        animateCaption: true,
                        defaultIframeWidth : 650,
                        defaultIframeHeight: 200
                }, options || {});

                // IE 6 - XML prolog problem
                if(window.ie6 && document.compatMode=="BackCompat"){
                        this.options.animateCaption = false;
                }

                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);

                /*        Build float panel
                        <div id="lbOverlay"></div>
                        <div id="lbCenter">
                                <div id="lbCanvas">
                                        <a id="lbPrevLink"></a>
                                        <a id="lbNextLink"></a>
                                        <!-- img or iframe element is inserted here -->
                                </div>
                        </div>
                        <div id="lbBottomContainer">
                                <div id="lbBottom">
                                        <a id="lbCloseLink"></a>
                                        <div id="lbCaption"></div>
                                        <div id="lbNumber"></div>
                                        <div style="clear:both;"></div>
                                </div>
                        </div>
                */

                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.canvas = new Element('div').setProperty('id', 'lbCanvas').injectInside(this.center);
                this.prevLink = new Element('a').setProperties({id: 'lbPrevLink', href: '#'}).setStyle('display', 'none').injectInside(this.canvas);
                this.nextLink = this.prevLink.clone().setProperty('id', 'lbNextLink').injectInside(this.canvas);
                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);
                new Element('div').setStyle('clear', 'both').injectInside(this.bottom);

                /* Build effects */
                var nextEffect = this.nextEffect.bind(this);
                this.fx = {
                        overlay: this.overlay.effect('opacity', {duration: 500}).hide(),
                        resizeCenter: this.center.effects({duration: this.options.resizeDuration, transition: this.options.resizeTransition, onComplete: nextEffect}),
                        image: this.canvas.effect('opacity', {duration: 500, onComplete: nextEffect}),
                        bottom: this.bottomContainer.effect('height', {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, link.rev);

                var j, itemNumber, items = [];
                this.anchors.each(function(el){
                        if (el.rel == link.rel){
                                for (j = 0; j < items.length; j++) if(items[j][0] == el.href && items[j][2] == el.rev) break;
                                if (j == items.length){
                                        items.push([el.href, el.title, el.rev]);
                                        if (el.href == link.href && el.rev == link.rev) itemNumber = j;
                                }
                        }
                }, this);
                return this.open(items, itemNumber);
        },

        show: function(url, title, rev){
                return this.open([[url, title, rev]], 0);
        },

        open: function(items, itemNumber){
                this.items = items;
                this.position();
                this.setup(true);
                var wh = (window.getHeight() == 0) ? window.getScrollHeight() : window.getHeight();
                var st = document.body.scrollTop  || document.documentElement.scrollTop;
                this.top = st + (wh / 15);
                this.center.setStyles({top: this.top+'px', display: ''});
                this.fx.overlay.start(0.7);
                return this.changeItem(itemNumber);
        },

        position: function(){
                //IE6 - XML prolog problem.
                var ww = (window.getWidth() == 0) ? window.getScrollWidth()-22 : window.getWidth();
                var wh = (window.getHeight() == 0) ? window.getScrollHeight() : window.getHeight();
                var st = document.body.scrollTop  || document.documentElement.scrollTop;
                this.overlay.setStyles({top: st+'px', height: wh+'px', width:ww+'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.changeItem(this.activeItem-1);
        },

        next: function(){
                return this.changeItem(this.activeItem+1);
        },

        changeItem: function(itemNumber){
                if (this.step || (itemNumber < 0) || (itemNumber >= this.items.length)) return false;
                this.step = 1;
                this.activeItem = itemNumber;

                this.bottomContainer.style.display = this.prevLink.style.display = this.nextLink.style.display = 'none';
                this.fx.image.hide();
                this.center.className = 'lbLoading';

                // discard previous content by clicking
                this.removeCurrentItem();

                // check item type
                var url = this.items[this.activeItem][0];
                var rev = this.items[this.activeItem][2];

                var re_imageURL = /\.(jpe?g|png|gif|bmp)/i;
                if( url.match(re_imageURL) ) {
                        this.preload = new Image();        // JavaScript native Object
                        this.preload.datatype = 'image';
                        this.preload.w = this.matchOrDefault(rev, new RegExp("width=(\\d+%?)", "i"), -1); //-1 if use original size.
                        this.preload.h = this.matchOrDefault(rev, new RegExp("height=(\\d+%?)", "i"), -1);
                        this.preload.onload = this.nextEffect.bind(this);
                        this.preload.src = url;
                }else{
                        this.preload = new Object ();        // JavaScript native Object
                        this.preload.datatype = 'iframe';
                        this.preload.w =  this.matchOrDefault(rev, new RegExp("width=(\\d+)", "i"), this.options.defaultIframeWidth);
                        this.preload.h = this.matchOrDefault(rev, new RegExp("height=(\\d+)", "i"), this.options.defaultIframeHeight);
                        this.preload.src = url;
                        this.nextEffect(); //asynchronous loading
                }

                return false;
        },

        nextEffect: function(){
                switch (this.step++){
                case 1:
                        this.center.className = '';

                        // create HTML element
                        if( this.preload.datatype == 'image' ) {
                                var ws = (this.preload.w == -1) ? this.preload.width.toString() : this.preload.w.toString();
                                var hs = (this.preload.h == -1) ? this.preload.height.toString() : this.preload.h.toString();
                                this.p_width = ( q = ws.match(/(\d+)%/) ) ? q[1] * this.preload.width * 0.01 : ws;
                                this.p_height = ( q = hs.match(/(\d+)%/) ) ? q[1] * this.preload.height * 0.01 : hs;
                                new Element('img').setProperties({id: 'lbImage', src:this.preload.src, width:this.p_width, height:this.p_height}).injectInside(this.canvas);
                                this.nextLink.style.right = '';
                        }else{
                                this.p_width = this.preload.w;
                                this.p_height = this.preload.h;
                                // Safari would not update iframe content that has static id.
                                this.iframeId = "lbFrame_"+new Date().getTime();
                                new Element('iframe').setProperties({id: this.iframeId, width: this.p_width, height: this.p_height, frameBorder:0, scrolling:'yes', src:this.preload.src}).injectInside(this.canvas);
                                this.nextLink.style.right = '25px';
                        }
                        this.canvas.style.width = this.bottom.style.width = this.p_width+'px';
                        this.canvas.style.height = this.prevLink.style.height = this.nextLink.style.height = this.p_height+'px';

                        this.caption.setHTML(this.items[this.activeItem][1] || '');
                        this.number.setHTML( (this.items.length == 1) ? '' : 'Page ' + (this.activeItem+1) + ' of ' + this.items.length );

                        if (this.activeItem) this.preloadPrev.src = this.items[this.activeItem-1][0];
                        if (this.activeItem != (this.items.length - 1)) this.preloadNext.src = this.items[this.activeItem+1][0];
                        if (this.center.clientHeight != this.canvas.offsetHeight){
                                var oh = (this.p_height == this.canvas.clientHeight) ? this.canvas.offsetHeight : eval(this.p_height)+18; // fix for ie
                                this.fx.resizeCenter.start({height: oh});
                                break;
                        }

                        this.step++;
                case 2:
                        if (this.center.clientWidth != this.canvas.offsetWidth){
                                var ow = (this.p_width == this.canvas.clientWidth) ? this.canvas.offsetWidth : eval(this.p_width)+18; // fix for ie
                                this.fx.resizeCenter.start({width: ow, marginLeft: -ow/2});
                                break;
                        }
                        this.step++;
                case 3:
                        this.bottomContainer.setStyles({top: (this.top + this.center.clientHeight)+'px', height:'0px', marginLeft: this.center.style.marginLeft, width:this.center.style.width, display: ''});
                        this.fx.image.start(1);
                        break;
                case 4:
                        if (this.options.animateCaption){
                                // This is not smooth animation in IE 6 with XML prolog.
                                // If your site is XHTML strict with XML prolog, disable this option.
                                this.fx.bottom.start(0,this.bottom.offsetHeight0);
                                break;
                        }
                        this.bottomContainer.style.height = (this.bottom.offsetHeight0)+'px';
                case 5:
                        if (this.activeItem){
                                this.prevLink.style.display = '';
                        }
                        if (this.activeItem != (this.items.length - 1)){
                                this.nextLink.style.display = '';
                        }
                        this.step = 0;
                }
        },

        close: function(){
                if (this.step < 0) return;
                this.step = -1;
                this.removeCurrentItem();        // discard content
                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;
        },

        removeCurrentItem: function(){
                if (this.preload){
                        if( this.preload.datatype == 'image' ) {
                                $('lbImage').remove();
                                this.preload.onload = Class.empty;
                        }else{
                                $(this.iframeId).remove();
                        }
                        this.preload = null;
                }
        },

        matchOrDefault: function(str, re, val){
                var hasQuery = str.match(re);
                return hasQuery ? hasQuery[1] : val;
        }

};

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