/**
 * SqueezeBox - Expandable Lightbox
 *
 * Allows to open various content as modal,
 * centered and animated box.
 *
 * Dependencies: MooTools 1.2 trunk (04/2008)
 *
 * Inspired by
 *  ... Lokesh Dhakar   - The original Lightbox v2
 *
 * @version     1.1 rc2
 *
 * @license     MIT-style license
 * @author      Harald Kirschner <mail [at] digitarald.de>
 * @copyright   Author
 */
var SqueezeBox = {

    presets: {
        size: {x: 600, y: 450},
        sizeLoading: {x: 200, y: 150},
        marginInner: {x: 20, y: 20},
        marginImage: {x: 50, y: 75},
        handler: false,
        target: null,
        closable: true,
        closeBtn: true,
        zIndex: 65555,
        overlayOpacity: 0.7,
        classWindow: '',
        classOverlay: '',
        overlayFx: {},
        resizeFx: {},
        contentFx: {},
        parse: 'rel', // false
        parseSecure: false,
        ajaxOptions: {},
        onOpen: $empty,
        onClose: $empty,
        onUpdate: $empty,
        onResize: $empty,
        onMove: $empty,
        onShow: $empty,
        onHide: $empty
    },

    initialize: function(presets) {
        if (this.options) return this;
        this.presets = $merge(this.presets, presets);
        this.options = {};
        this.setOptions(this.presets).build();
        this.bound = {
            window: this.reposition.bind(this, [null]),
            scroll: this.checkTarget.bind(this),
            close: this.close.bind(this),
            key: this.onKey.bind(this)
        };
        this.isOpen = this.isLoading = false;
        return this;
    },

    build: function() {
        this.overlay = new Element('div', {
            id: 'sbox-overlay',
            styles: {display: 'none', zIndex: this.options.zIndex}
        });
        this.content = new Element('div', {id: 'sbox-content'});
        this.closeBtn = new Element('a', {id: 'sbox-btn-close', href: '#'});
        this.win = new Element('div', {
            id: 'sbox-window',
            styles: {display: 'none', zIndex: this.options.zIndex + 2}
        }).adopt(this.closeBtn, this.content);
        this.fx = {
            overlay: new Fx.Tween(this.overlay, $merge({
                property: 'opacity',
                onStart: Events.prototype.clearChain,
                duration: 250,
                link: 'cancel'
            }, this.options.overlayFx)).set(0),
            win: new Fx.Morph(this.win, $merge({
                onStart: Events.prototype.clearChain,
                unit: 'px',
                duration: 750,
                transition: Fx.Transitions.Quint.easeOut,
                link: 'cancel',
                unit: 'px'
            }, this.options.resizeFx)),
            content: new Fx.Tween(this.content, $merge({
                property: 'opacity',
                duration: 250,
                link: 'cancel'
            }, this.options.contentFx)).set(0)
        };
        $(document.body).adopt(this.overlay, this.win);
    },

    assign: function(to, options) {
        return to.addEvent('click', function() {
            return !SqueezeBox.fromElement(this, options);
        });
    },

    fromElement: function(from, options) {
        this.initialize();
        if (this.element) this.trash();
        this.element = $(from);
        this.setOptions($merge(this.presets, options || {}));
        if (this.element && this.options.parse) {
            var obj = this.element.getProperty(this.options.parse);
            if (obj && (obj = JSON.decode(obj, this.options.parseSecure))) this.setOptions(obj);
        }
        this.assignOptions();
        this.url = ((this.element) ? (this.options.url || this.element.get('href')) : from) || '';
        var handler = this.options.handler;
        if (handler) return this.setContent(handler, this.parsers[handler].call(this, true));
        var ret = false;
        this.parsers.some(function(parser, key) {
            var content = parser.call(this);
            if (content) {
                ret = this.setContent(key, content);
                return true;
            }
            return false;
        }, this);
        return ret;
    },

    assignOptions: function() {
        this.overlay.set('class', this.options.classOverlay);
        this.win.set('class', this.options.classWindow);
        if (Browser.Engine.trident4) this.win.addClass('sbox-window-ie6');
    },

    close: function(e) {
        var stoppable = ($type(e) == 'event');
        if (stoppable) e.stop();
        if (!this.isOpen || (stoppable && !$lambda(this.options.closable).call(this, e))) return this;
        this.fx.overlay.start(0).chain(this.toggleOverlay.bind(this));
        this.win.setStyle('display', 'none');
        this.trash();
        this.toggleListeners();
        this.isOpen = false;
        this.fireEvent('onClose', [this.content]);
        $$('#sbox-content iframe').destroy();
        //No need to refresh the window
        //window.location = window.location.href.replace(/\?.*/, ''); // remove query string
        //location.reload(true);

        //return this;
    },

    trash: function() {
        this.element = this.asset = null;
        this.options = {};
        this.removeEvents().setOptions(this.presets).callChain();
    },

    onError: function() {
        this.asset = null;
        this.setContent('string', 'Error during loading');
    },

    setContent: function(handler, content) {
        if (!this.handlers[handler]) return false;
        this.content.className = 'sbox-content-' + handler;
        this.applyTimer = this.applyContent.delay(this.fx.overlay.options.duration, this, this.handlers[handler].call(this, content));
        if (this.overlay.retrieve('opacity')) return this;
        this.toggleOverlay(true);
        this.fx.overlay.start(this.options.overlayOpacity);
        return this.reposition();
    },

    applyContent: function(content, size) {
        this.applyTimer = $clear(this.applyTimer);
        this.hideContent();
        if (!content) {
            this.toggleLoading(true);
        } else {
            if (this.isLoading) this.toggleLoading(false);
            this.fireEvent('onUpdate', [this.content], 20);
        }
        this.content.empty();
        if (['string', 'array', false].contains($type(content))) this.content.set('html', content || '');
        else this.content.adopt(content);
        this.callChain();
        if (!this.isOpen) {
            this.toggleListeners(true);
            this.resize(size, true);
            this.isOpen = true;
            this.fireEvent('onOpen', [this.content]);
        } else {
            this.resize(size);
        }
    },

    resize: function(size, instantly) {
        var box = document.getSize(), scroll = document.getScroll();
        this.size = $merge((this.isLoading) ? this.options.sizeLoading : this.options.size, size);
        var to = {
            width: this.size.x,
            height: this.size.y,
            left: (scroll.x + (box.x - this.size.x - this.options.marginInner.x) / 2).toInt(),
            top: (scroll.y + (box.y - this.size.y - this.options.marginInner.y) / 2).toInt()
        };
    // Prefent the Top of the Lightbox from going above the browser window
    if( to.top < 20 ) to.top = 20;
        
        $clear(this.showTimer || null);
        this.hideContent();
        if (!instantly) {
            this.fx.win.start(to).chain(this.showContent.bind(this));
        } else {
            this.win.setStyles(to).setStyle('display', '');
            this.showTimer = this.showContent.delay(50, this);
        }
        return this.reposition();
    },

    toggleListeners: function(state) {
        var fn = (state) ? 'addEvent' : 'removeEvent';
        this.closeBtn[fn]('click', this.bound.close);
        this.overlay[fn]('click', this.bound.close);
        document[fn]('keydown', this.bound.key)[fn]('mousewheel', this.bound.scroll);
        window[fn]('resize', this.bound.window)[fn]('scroll', this.bound.window);
    },

    toggleLoading: function(state) {
        this.isLoading = state;
        this.win[(state) ? 'addClass' : 'removeClass']('sbox-loading');
        if (state) this.fireEvent('onLoading', [this.win]);
    },

    toggleOverlay: function(state) {
        this.overlay.setStyle('display', (state) ? '' : 'none');
        $(document.body)[(state) ? 'addClass' : 'removeClass']('body-overlayed');
    },

    showContent: function() {
        if (this.content.get('opacity')) this.fireEvent('onShow', [this.win]);
        this.fx.content.start(1);
    },

    hideContent: function() {
        if (!this.content.get('opacity')) this.fireEvent('onHide', [this.win]);
        this.fx.content.set(0);
    },

    onKey: function(e) {
        switch (e.key) {
            case 'esc': this.close(e);
            case 'up': case 'down': return false;
        }
    },

    checkTarget: function(e) {
        return this.content.hasChild(e.target);
    },

    reposition: function() {
        var size = document.getSize(), scroll = document.getScroll();
        this.overlay.setStyles({
            left: scroll.x + 'px',
            top: scroll.y + 'px',
            width: size.x + 'px',
            height: size.y + 'px'
        });
        this.win.setStyles({
            left: (scroll.x + (size.x - this.win.offsetWidth) / 2).toInt() + 'px'
            //top: (scroll.y + (size.y - this.win.offsetHeight) / 2).toInt() + 'px'
        });
        return this.fireEvent('onMove', [this.overlay, this.win]);
    },

    removeEvents: function(type){
        if (!this.$events) return this;
        if (!type) this.$events = null;
        else if (this.$events[type]) this.$events[type] = null;
        return this;
    },

    extend: function(properties) {
        return $extend(this, properties);
    },

    handlers: new Hash(),

    parsers: new Hash()

};

SqueezeBox.extend(new Events($empty)).extend(new Options($empty)).extend(new Chain($empty));

SqueezeBox.parsers.extend({

    image: function(preset) {
        return (preset || (/\.(?:jpg|png|gif)$/i).test(this.url)) ? this.url : false;
    },

    clone: function(preset) {
        if ($(this.options.target)) return $(this.options.target);
        if (this.element && !this.element.parentNode) return this.element;
        var bits = this.url.match(/#([\w-]+)$/);
        return (bits) ? $(bits[1]) : (preset ? this.element : false);
    },

    ajax: function(preset) {
        return (preset || (this.url && !(/^(?:javascript|#)/i).test(this.url))) ? this.url : false;
    },

    iframe: function(preset) {
        return (preset || this.url) ? this.url : false;
    },

    string: function(preset) {
        return true;
    }
});

SqueezeBox.handlers.extend({

    image: function(url) {
        var size, tmp = new Image();
        this.asset = null;
        tmp.onload = tmp.onabort = tmp.onerror = (function() {
            tmp.onload = tmp.onabort = tmp.onerror = null;
            if (!tmp.width) {
                this.onError.delay(10, this);
                return;
            }
            var box = document.getSize();
            box.x -= this.options.marginImage.x;
            box.y -= this.options.marginImage.y;
            size = {x: tmp.width, y: tmp.height};
            for (var i = 2; i--;) {
                if (size.x > box.x) {
                    size.y *= box.x / size.x;
                    size.x = box.x;
                } else if (size.y > box.y) {
                    size.x *= box.y / size.y;
                    size.y = box.y;
                }
            }
            size.x = size.x.toInt();
            size.y = size.y.toInt();
            this.asset = $(tmp);
            tmp = null;
            this.asset.setProperties({width: size.x, height: size.y});
            if (this.isOpen) this.applyContent(this.asset, size);
        }).bind(this);
        tmp.src = url;
        if (tmp && tmp.onload && tmp.complete) tmp.onload();
        return (this.asset) ? [this.asset, size] : null;
    },

    clone: function(el) {
        return el.clone();
    },

    adopt: $arguments(0),

    ajax: function(url) {
        this.asset = new Request.HTML($merge({
            method: 'get'
        }, this.options.ajaxOptions)).addEvents({
            onSuccess: function(resp) {
                this.applyContent(resp);
                this.asset = null;
            }.bind(this),
            onFailure: this.onError.bind(this)
        });
        this.asset.send.delay(10, this.asset, [{url: url}]);
    },

    iframe: function(url) {
        return new Element('iframe', $merge({
            src: url,
            frameBorder: 0,
            width: this.options.size.x,
            height: this.options.size.y
        }, this.options.iframeOptions));
    },

    string: function(str) {
        return str;
    }

});

SqueezeBox.handlers.url = SqueezeBox.handlers.ajax;
SqueezeBox.parsers.url = SqueezeBox.parsers.ajax;
SqueezeBox.parsers.adopt = SqueezeBox.parsers.clone;