/*
 * Cools dialog library
 * @author Alek$
 * @date 06-09-2008
 *
 * Thanks to ksnk, cruelangel and smartov
 */

var replace_alert = true;
var replace_confirm = false;
var replace_prompt = false;

// Main dialog logics is placed here
function BuildDialog(type, callback)
{
	var myself = this;
	
	//
	// Internal function
	//
	
	// Build common dialog elements
	this.basicDialog = function ()
	{
		// Create basic layer
		this.win = document.createElement('div');
		this.win.className = "popup_dialog";
		
		// Create header bar
		var headbar = document.createElement('div');
		headbar.className = "popup_headerbar";
		
			// Create header controls
			var controlClose = document.createElement('span');
			controlClose.className = "popup_control";
			controlClose.innerHTML = "<b>X</b>";
			controlClose.onclick = function()
			{
				myself.close();
				myself.callback(false);
			}
			headbar.appendChild(controlClose);
		
		this.win.appendChild(headbar);
		
		// Create text container
		this.cont = document.createElement('span');
		this.cont.className = "popup_content";
		this.win.appendChild(this.cont);
		
		// Add Escape handler
		
		this.win.onkeydown = function (e)
		{
			var keynum;
			if(window.event) keynum = event.keyCode;
			else if(e.which) keynum = e.which;
			
			if(keynum == 27)
			{
				myself.close();
				myself.callback(false);
			}
		}
	}
	
	// Build elements for alert dialog
	this.buildAlert = function ()
	{
		// Create button
		var buttonDiv = document.createElement('div');
		buttonDiv.className = "popup_buttons";
		
			// Create OK button
			var bOK = document.createElement('input');
			bOK.type = "button";
			bOK.value = "OK";
			bOK.className = "form-control";
			bOK.onclick = function()
			{
				myself.close();
			}
			buttonDiv.appendChild(bOK);
		
		this.win.appendChild(buttonDiv);
		
		// Set focus function
		this.focus = function ()
		{
			bOK.focus();
		}
	}
	
	// Build elements for confirm dialog
	this.buildConfirm = function ()
	{
		// Create button
		var buttonDiv = document.createElement('div');
		buttonDiv.className = "popup_buttons";
		
			// Create OK button
			var bOK = document.createElement('input');
			bOK.type = "button";
			bOK.value = "OK";
		bOK.style.width = '50%';
		bOK.style.float = 'left';
			bOK.className = "form-control";
			bOK.onclick = function()
			{
				myself.close();
				myself.callback(true);
			}
			buttonDiv.appendChild(bOK);
			
			// Create Cancel button
			var bCancel = document.createElement('input');
			bCancel.type = "button";
			bCancel.value = "Cancel";
			bCancel.className = "form-control";
		bCancel.style.width = '50%';
			bCancel.onclick = function()
			{
				myself.close();
				myself.callback(false);
			}
			buttonDiv.appendChild(bCancel);
		
		this.win.appendChild(buttonDiv);
		
		// Set focus function
		this.focus = function ()
		{
			bOK.focus();
		}
	}
	
	// Build elements for prompt dialog
	this.buildPrompt = function ()
	{
		// Create input
		var textInput = document.createElement('textarea');
		textInput.style.width = '95%';
		this.win.appendChild(textInput);
		
		// Create button
		var buttonDiv = document.createElement('div');
		buttonDiv.className = "popup_buttons";
		
			// Create OK button
			var bOK = document.createElement('input');
			bOK.type = "button";
			bOK.value = "OK";
			bOK.className = "form-control";
			bOK.style.width = '50%';
		bOK.style.float = 'left';
			bOK.onclick = function()
			{
				myself.close();
				myself.callback(textInput.value);
			}
			buttonDiv.appendChild(bOK);
			
			// Create Cancel button
			var bCancel = document.createElement('input');
			bCancel.type = "button";
			bCancel.value = "Cancel";
			bCancel.className = "form-control";
		bCancel.style.width = '50%';
			bCancel.onclick = function()
			{
				myself.close();
				myself.callback(false);
			}
			buttonDiv.appendChild(bCancel);
		
		this.win.appendChild(buttonDiv);
		
		// Add Enter handler
		textInput.onkeydown = function (e)
		{
			var keynum;
			if(window.event) keynum = event.keyCode;
			else if(e.which) keynum = e.which;
			
			/*if(keynum == 13)
			{
				myself.close();
				myself.callback(textInput.value);
				
				// Here is a little magic
				return false;
			}*/
		}
		
		// Add specific function for seting text field value
		this.setValue = function (value)
		{
			textInput.value = value;
		}
		
		// Set focus function
		this.focus = function ()
		{
			bOK.focus();
		}
	}
	
	// Set dialog text
	this.setText = function (text)
	{
		this.cont.innerHTML = text;
	}
	
	// Display dialog
	this.show = function ()
	{
		document.body.appendChild(this.win);
		this.win.style.top = '0px';
		this.win.style.left = (document.body.clientWidth - 300)/2 + 'px';
		this.win.focus();
		this.focus();
	}
	
	// Close dialog
	this.close = function ()
	{
		document.body.removeChild(this.win);
	}
	
	this.focus = function () {};
	
	//
	// Start building dialog
	//
	
	this.basicDialog();
	
	// Set callback function
	if(callback == null)
	{
		callback = function(result) {};
	}
	this.callback = callback;
	
	// Build specific elements for
	if(type == 'alert')
	{
		// alert
		this.buildAlert();
	}
	else if(type == 'confirm')
	{
		// confirm
		this.buildConfirm();
	}
	else if(type == 'prompt')
	{
		//prompt
		this.buildPrompt();
	}
}

// Main alert function
function myAlert (text)
{
	var win = new BuildDialog('alert', null);
	win.setText(text);
	win.show();
	//defaultAlert(text);
}

// Main confirm function
function myConfirm(text, callback)
{
	var win = new BuildDialog('confirm', callback);
	win.setText(text);
	win.show();
}

// Main prompt function
function myPrompt(text, value, callback)
{
	var win = new BuildDialog('prompt', callback);
	win.setText(text);
	win.setValue(value);
	win.show();
}


//
// Replace default functions
//

// Store default functions
window.defaultAlert = window.alert;
window.defaultConfirm = window.alert;
window.defaultPrompt = window.alert;

// Replace
if(replace_alert)
{
	window.alert = myAlert;
}
if(replace_confirm)
{
	window.confirm = myConfirm;
}
if(replace_prompt)
{
	window.prompt = myPrompt;
}