/**
* @license
* jQuery Tools @VERSION Overlay - Overlay base. Extend it.
*
* NO COPYRIGHTS OR LICENSES. DO WHAT YOU LIKE.
*
* http://flowplayer.org/tools/overlay/
*
* Since: March 2008
* Date: @DATE
*/
(function($) {

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

$.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: false,

left: 710,
load: false, // 1.2
mask: null,
oneInstance: true,
speed: 'fast',
target: null, // target element to be overlayed. by default taken from [rel]
top: 85
}
};


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) {
if (fn) { $(self).bind(name, fn); }
return self;
};
});

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

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