/**
 * @license
 * jQuery Tools 1.2.2 Overlay - Overlay base. Extend it.
 *
 * NO COPYRIGHTS OR LICENSES. DO WHAT YOU LIKE.
 *
 * http://flowplayer.org/tools/overlay/
 *
 * Since: March 2008
 * Date:    Wed May 19 06:53:17 2010 +0000
 */
(function($) {

	// static constructs
	$.tools = $.tools || {version: '1.2.2'};

	$.tools.overlay = {

		addEffect: function(name, loadFn, closeFn) {
			effects[name] = [loadFn, closeFn];
		},

		conf: {
			close: null,
			closeOnClick: true,
			closeOnEsc: true,
			closeSpeed: 'fast',
			effect: 'default',

			// since 1.2. fixed positioning not supported by IE6
			fixed: !$.browser.msie || $.browser.version > 6,

			left: 'center',
			load: false, // 1.2
			mask: null,
			oneInstance: true,
			speed: 'normal',
			target: null, // target element to be overlayed. by default taken from [rel]
			top: '10%'
		}
	};


	var instances = [], effects = {};

	// the default effect. nice and easy!
	$.tools.overlay.addEffect('default',

		/*
			onLoad/onClose functions must be called otherwise none of the
			user supplied callback methods won't be called
		*/
		function(pos, onLoad) {

			var conf = this.getConf(),
				 w = $(window);

			if (!conf.fixed)  {
				pos.top += w.scrollTop();
				pos.left += w.scrollLeft();
			}

			pos.position = conf.fixed ? 'fixed' : 'absolute';
			this.getOverlay().css(pos).fadeIn(conf.speed, onLoad);

		}, function(onClose) {
			this.getOverlay().fadeOut(this.getConf().closeSpeed, onClose);
		}
	);


	function Overlay(trigger, conf) {

		// private variables
		var self = this,
			 fire = trigger.add(self),
			 w = $(window),
			 closers,
			 overlay,
			 opened,
			 maskConf = $.tools.expose && (conf.mask || conf.expose),
			 uid = Math.random().toString().slice(10);


		// mask configuration
		if (maskConf) {
			if (typeof maskConf == 'string') { maskConf = {color: maskConf}; }
			maskConf.closeOnClick = maskConf.closeOnEsc = false;
		}

		// get overlay and triggerr
		var jq = conf.target || trigger.attr("rel");
		overlay = jq ? $(jq) : null || trigger;

		// overlay not found. cannot continue
		if (!overlay.length) { throw "Could not find Overlay: " + jq; }

		// trigger's click event
		if (trigger && trigger.index(overlay) == -1) {
			trigger.click(function(e) {
				self.load(e);
				return e.preventDefault();
			});
		}

		// API methods
		$.extend(self, {

			load: function(e) {

				// can be opened only once
				if (self.isOpened()) { return self; }

				// find the effect
		 		var eff = effects[conf.effect];
		 		if (!eff) { throw "Overlay: cannot find effect : \"" + conf.effect + "\""; }

				// close other instances?
				if (conf.oneInstance) {
					$.each(instances, function() {
						this.close(e);
					});
				}

				// onBeforeLoad
				e = e || $.Event();
				e.type = "onBeforeLoad";
				fire.trigger(e);
				if (e.isDefaultPrevented()) { return self; }

				// opened
				opened = true;

				// possible mask effect
				if (maskConf) { $(overlay).expose(maskConf); }

				// position & dimensions
				var top = conf.top,
					 left = conf.left,
					 oWidth = overlay.outerWidth({margin:true}),
					 oHeight = overlay.outerHeight({margin:true});

				if (typeof top == 'string')  {
					top = top == 'center' ? Math.max((w.height() - oHeight) / 2, 0) :
						parseInt(top, 10) / 100 * w.height();
				}

				if (left == 'center') { left = Math.max((w.width() - oWidth) / 2, 0); }


		 		// load effect
				eff[0].call(self, {top: top, left: left}, function() {
					if (opened) {
						e.type = "onLoad";
						fire.trigger(e);
					}
				});

				// mask.click closes overlay
				if (maskConf && conf.closeOnClick) {
					$.mask.getMask().one("click", self.close);
				}

				// when window is clicked outside overlay, we close
				if (conf.closeOnClick) {
					$(document).bind("click." + uid, function(e) {
						if (!$(e.target).parents(overlay).length) {
							self.close(e);
						}
					});
				}

				// keyboard::escape
				if (conf.closeOnEsc) {

					// one callback is enough if multiple instances are loaded simultaneously
					$(document).bind("keydown." + uid, function(e) {
						if (e.keyCode == 27) {
							self.close(e);
						}
					});
				}


				return self;
			},

			close: function(e) {

				if (!self.isOpened()) { return self; }

				e = e || $.Event();
				e.type = "onBeforeClose";
				fire.trigger(e);
				if (e.isDefaultPrevented()) { return; }

				opened = false;

				// close effect
				effects[conf.effect][1].call(self, function() {
					e.type = "onClose";
					fire.trigger(e);
				});

				// unbind the keyboard / clicking actions
				$(document).unbind("click." + uid).unbind("keydown." + uid);

				if (maskConf) {
					$.mask.close();
				}

				return self;
			},

			getOverlay: function() {
				return overlay;
			},

			getTrigger: function() {
				return trigger;
			},

			getClosers: function() {
				return closers;
			},

			isOpened: function()  {
				return opened;
			},

			// manipulate start, finish and speeds
			getConf: function() {
				return conf;
			}

		});

		// callbacks
		$.each("onBeforeLoad,onStart,onLoad,onBeforeClose,onClose".split(","), function(i, name) {

			// configuration
			if ($.isFunction(conf[name])) {
				$(self).bind(name, conf[name]);
			}

			// API
			self[name] = function(fn) {
				$(self).bind(name, fn);
				return self;
			};
		});

		// close button
		closers = overlay.find(conf.close || ".close");

		if (!closers.length && !conf.close) {
			closers = $('<div class="close"></div>');
			overlay.prepend(closers);
		}

		closers.click(function(e) {
			self.close(e);
		});

		// autoload
		if (conf.load) { self.load(); }

	}

	// jQuery plugin initialization
	$.fn.overlay = function(conf) {

		// already constructed --> return API
		var el = this.data("overlay");
		if (el) { return el; }

		if ($.isFunction(conf)) {
			conf = {onBeforeLoad: conf};
		}

		conf = $.extend(true, {}, $.tools.overlay.conf, conf);

		this.each(function() {
			el = new Overlay($(this), conf);
			instances.push(el);
			$(this).data("overlay", el);
		});

		return conf.api ? el: this;
	}; 

})(jQuery);