/*
* Lert v1.0
* by Jeffrey Sambells - http://JeffreySambells.com
* For more information on this script, visit http://JeffreySambells.com/openprojects/lert/
* Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
* Icons from Tango Desktop Project http://tango.freedesktop.org/Tango_Desktop_Project
*/
function Lert(title, message, buttons, options) {
	this.title_ = title;
	this.message_ = message;
	this.buttons_ = buttons;
	this.defaultButton_ = options.defaultButton || this.buttons_[0];
	this.icon_ = options.icon || null;
}

Lert.prototype.display = function() {
	var body = document.getElementsByTagName ('BODY')[0];
	//create the overlay if necessary
	var overlay = document.getElementById('lertOverlay');
	if(!overlay) {
		var overlay = document.createElement("div");
		overlay.setAttribute('id','lertOverlay');
		overlay.style.display = 'none';
		body.appendChild(overlay);
	}

	//position and show the overlay
	overlay.style.height='100%';
	overlay.style.display='block';

	//create the container if necessary
	var container = document.getElementById('lertContainer');
	if(!container) {
		var container = document.createElement("div");
		container.setAttribute('id','lertContainer');
		container.style.display = 'none';
		body.appendChild(container);
	}

	//position and show the container
	container.style.top = '35%';
	container.style.display = 'block';

	//create the window
	var win = document.createElement('div');
	win.setAttribute('id','lertWindow');

	var topBorder = document.createElement('div');
	topBorder.setAttribute('id','topBorder');
	topBorder.innerHTML = this.title_;
	var iconClose = document.createElement('img');
	    iconClose.setAttribute('src', 'js/lert/images/close_button.gif');
	    iconClose.setAttribute('id','closeIcon');
	    iconClose.setAttribute('alt','');
	    iconClose.setAttribute('style','cursor: pointer;');
	    iconClose.setAttribute('onclick', "document.getElementById('lertOverlay').style.display='none';document.getElementById('lertContainer').style.display='none';document.getElementById('lertContainer').innerHTML = '';");
	topBorder.appendChild(iconClose);
	win.appendChild(topBorder);
	//create the optional icon
	if(this.icon_ != null) {
		var icon = document.createElement('img');
		icon.setAttribute('src',this.icon_);

		icon.setAttribute('id','lertIcon');
		icon.setAttribute('alt','');
		win.appendChild(icon);
	}

	//create the message space
	var message = document.createElement('p');
	message.setAttribute('id','lertMessage');
	message.innerHTML = this.message_;
	win.appendChild(message);

	//create the button space
	var buttons = document.createElement('div');
	buttons.setAttribute('id','lertButtons');

	var oldKeyDown = document.onkeydown;

	//add each button
	for(i in this.buttons_) {
		var button = this.buttons_[i];
		if(button.getDom) {
			var domButton = button.getDom(function() {
				container.style.display = 'none';
				overlay.style.display = 'none';
				document.onkeydown=oldKeyDown;
				container.innerHTML = '';
				button.onclick_;
			},this.defaultButton_);
			buttons.appendChild(domButton);
		}
	}
	win.appendChild(buttons);

	document.onkeydown = this.keyboardControls;

	//append the window
	container.appendChild(win);

}

Lert.prototype.keyboardControls = function(e) {
	if (e == null) { keycode = event.keyCode; } // ie
	else { keycode = e.which; } // mozilla
	if(keycode==13){ 
		document.getElementById('lertDefaultButton').onclick();
	}
}

function LertButton(label, event, options) {
	this.label_ = label;
	this.onclick_ = event;
	this.eventClick = function() {};
}

LertButton.prototype.getDom = function(eventCleanup,defaultButton) {
	var button = document.createElement('a');
	//button.setAttribute('href','javascript:void(0);');
	button.className = 'lertButton';
	if(this == defaultButton) button.setAttribute('id','lertDefaultButton');
	button.innerHTML = this.label_;

	var eventOnclick =  this.onclick_;
	button.onclick = function() {
		eventCleanup();
		eventOnclick();
	}
	this.eventClick = button.onclick;
	return button;
}