function $empty(){};

/**
 * 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.doc.getWindow = function() { return window; };
		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 (window.webkit420) {
				this.win.setStyle('-webkit-box-shadow', '0 0 10px rgba(0, 0, 0, 0.7)');
			} else if (!window.ie6) {
				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.closeBtn.addEvent("click", function(ev){(new Event(ev)).stop();}); // prevents goto top
		this.fx = {
			overlay: new Fx.Style(this.overlay, 'opacity', $merge({
				onStart: Chain.prototype.clearChain,
				duration: 250,
				link: 'cancel'
			}, this.options.overlayFx)).hide(),
			win: new Fx.Styles(this.win, $merge({
				onStart: Chain.prototype.clearChain,
				unit: 'px',
				duration: 750,
				transition: Fx.Transitions.Quint.easeOut,
				link: 'cancel'
			}, this.options.resizeFx)),
			content: new Fx.Style(this.content, 'opacity', $merge({
				duration: 250,
				link: 'cancel'
			}, this.options.contentFx)).hide()
		};
		$(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.addClass(this.options.classOverlay);
        this.win.addClass(this.options.classWindow);
		if (window.ie6) 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.fireEvent('onClose', [this.content]);
		this.trash();
		this.toggleListeners();
		this.isOpen = false;
		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.getStyle('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 legacy_size = self.getSize();
        var box   = legacy_size.size, scroll = legacy_size.scroll;
		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 = self.getSize().size.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;
			if(this.scrollOffset) this.doc.body.setStyle('margin-right', this.scrollOffset);
		} else {
			this.doc.body.setStyle('margin-right', '');
		}
	},

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

	hideContent: function() {
		if (!this.content.getStyle('opacity')) this.fireEvent('onHide', [this.win]);
		this.fx.content.stop().hide();
	},

	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 legacy_size = self.getSize();
		var size = legacy_size.size, scroll = legacy_size.scroll, ssize = legacy_size.scrollSize;
		this.overlay.setStyles({
			width: ssize.x + 'px',
			height: ssize.y + 'px'
		});
		var new_lft = (scroll.x + (size.x - this.win.offsetWidth) / 2 - this.scrollOffset).toInt();
		var new_top = (scroll.y + (size.y - this.win.offsetHeight) / 2).toInt();
		if( new_lft && new_top ) {
		    this.win.setStyles({
			    left: new_lft + 'px',
			    top: new_top + '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: {
	    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();
			    var box = window.getSize().size;
			    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;
	    }

    },

	parsers: {
	    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.extend(new Events($empty)).extend(new Options($empty)).extend(new Chain($empty));

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