/**
 * 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: false, // 'rel'
		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]);
		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()
		};
		$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;