/**
 * SqueezeBox - Expandable Lightbox
 *
 * Allows to open various content as modal,
 * centered and animated box.
 *
 * Dependencies: MooTools 1.2
 *
 * Inspired by
 *  ... Lokesh Dhakar        - The original Lightbox v2
 *
 * @version                1.1 rc4
 *
 * @license                MIT-style license
 * @author                Harald Kirschner <mail [at] digitarald.de>
 * @copyright        Author
 */

var SqueezeBox = {

        presets: {
                onOpen: $empty,
                onClose: $empty,
                onUpdate: $empty,
                onResize: $empty,
                onMove: $empty,
                onShow: $empty,
                onHide: $empty,
                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: false, // 'rel'
                parseSecure: false,
                shadow: true,
                document: null,
                ajaxOptions: {}
        },

        initialize: function(presets) {
                if (this.options) return this;

                this.presets = $merge(this.presets, presets);
                this.doc = this.presets.document || document;
                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.win = new Element('div', {
                        id: 'sbox-window',
                        styles: {display: 'none', zIndex: this.options.zIndex + 2}
                });
                if (this.options.shadow) {
                        if (Browser.Engine.webkit420) {
                                this.win.setStyle('-webkit-box-shadow', '0 0 10px rgba(0, 0, 0, 0.7)');
                        } else if (!Browser.Engine.trident4) {
                                var shadow = new Element('div', {'class': 'sbox-bg-wrap'}).inject(this.win);
                                var relay = function(e) {
                                        this.overlay.fireEvent('click', [e]);
                                }.bind(this);
                                ['n', 'ne', 'e', 'se', 's', 'sw', 'w', 'nw'].each(function(dir) {
                                        new Element('div', {'class': 'sbox-bg sbox-bg-' + dir}).inject(shadow).addEvent('click', relay);
                                });
                        }
                }
                this.content = new Element('div', {id: 'sbox-content'}).inject(this.win);
                this.closeBtn = new Element('a', {id: 'sbox-btn-close', href: '#'}).inject(this.win);
                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)
                };
                $(this.doc.body).adopt(this.overlay, this.win);
        },

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

                if (this.element != null) this.trash();
                this.element = $(subject) || false;
                
                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.url = ((this.element) ? (this.element.get('href')) : subject) || this.options.url || '';

                this.assignOptions();
                
                var handler = handler || this.options.handler;
                if (handler) return this.setContent(handler, this.parsers[handler].call(this, true));
                var ret = false;
                return this.parsers.some(function(parser, key) {
                        var content = parser.call(this);
                        if (content) {
                                ret = this.setContent(key, content);
                                return true;
                        }
                        return false;
                }, this);
        },
        
        fromElement: function(from, options) {
                return this.open(from, options);
        },

        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();

                return this;
        },

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

        onError: function() {
                this.asset = null;
                this.setContent('string', this.options.errorMsg || 'An error occurred');
        },

        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) {
                if (!this.isOpen && !this.applyTimer) return;
                this.applyTimer = $clear(this.applyTimer);
                this.hideContent();
                if (!content) {
                        this.toggleLoading(true);
                } else {
                        if (this.isLoading) this.toggleLoading(false);
                        this.fireEvent('onUpdate', [this.content], 20);
                }
                if (content) {
                        if (['string', 'array'].contains($type(content))) this.content.set('html', content);
                        else if (!this.content.hasChild(content)) 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) {
                this.showTimer = $clear(this.showTimer || null);
                var box = this.doc.getSize(), scroll = this.doc.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()
                };
                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);
                this.doc[fn]('keydown', this.bound.key)[fn]('mousewheel', this.bound.scroll);
                this.doc.getWindow()[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) {
                var full = this.doc.getSize().x;
                this.overlay.setStyle('display', (state) ? '' : 'none');
                this.doc.body[(state) ? 'addClass' : 'removeClass']('body-overlayed');
                if (state) {
                        this.scrollOffset = this.doc.getWindow().getSize().x - full;
                        this.doc.body.setStyle('margin-right', this.scrollOffset);
                } else {
                        this.doc.body.setStyle('margin-right', '');
                }
        },

        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.cancel().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 = this.doc.getSize(), scroll = this.doc.getScroll(), ssize = this.doc.getScrollSize();
                this.overlay.setStyles({
                        width: ssize.x + 'px',
                        height: ssize.y + 'px'
                });
                this.win.setStyles({
                        left: (scroll.x + (size.x - this.win.offsetWidth) / 2 - this.scrollOffset).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 = this.doc.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.width = size.x;
                        this.asset.height = size.y;
                        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) {
                if (el) return el.clone();
                return this.onError();
        },

        adopt: function(el) {
                if (el) return el;
                return this.onError();
        },

        ajax: function(url) {
                var options = this.options.ajaxOptions || {};
                this.asset = new Request.HTML($merge({
                        method: 'get',
                        evalScripts: false
                }, this.options.ajaxOptions)).addEvents({
                        onSuccess: function(resp) {
                                this.applyContent(resp);
                                if (options.evalScripts !== null && !options.evalScripts) $exec(this.asset.response.javascript);
                                this.fireEvent('onAjax', [resp, this.asset]);
                                this.asset = null;
                        }.bind(this),
                        onFailure: this.onError.bind(this)
                });
                this.asset.send.delay(10, this.asset, [{url: url}]);
        },

        iframe: function(url) {
                this.asset = new Element('iframe', $merge({
                        src: url,
                        frameBorder: 0,
                        width: this.options.size.x,
                        height: this.options.size.y
                }, this.options.iframeOptions));
                if (this.options.iframePreload) {
                        this.asset.addEvent('load', function() {
                                this.applyContent(this.asset.setStyle('display', ''));
                        }.bind(this));
                        this.asset.setStyle('display', 'none').inject(this.content);
                        return false;
                }
                return this.asset;
        },

        string: function(str) {
                return str;
        }

});

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