var Popup = require ('./popup');

/**
 * Class to show message dialogs with buttons.
 */
var Dialog = new Class ();
module.exports = Dialog;

var Button =
{
	 OK     : 1 << 1
	,ACCEPT : 1 << 2
	,CANCEL : 1 << 3
	,RETRY  : 1 << 4
	,YES    : 1 << 5
	,NO     : 1 << 6
};

var labels =
[{
	response: Button.NO
	,label: 'No'
},{
	response: Button.CANCEL
	,label: 'Cancel'
},{
	response: Button.RETRY
	,label: 'Retry'
},{
	response: Button.ACCEPT
	,label: 'Accept'
},{
	response: Button.OK
	,label: 'Ok'
},{
	response: Button.YES
	,label: 'Yes'
}];

Button.CANCEL_ACCEPT = Button.CANCEL | Button.ACCEPT;
Button.ACCEPT_RETRY = Button.ACCEPT | Button.RETRY;
Button.YES_NO = Button.YES | Button.NO;

Dialog.extend
({
	 Button: Button
});

Dialog.implement
({
	Extends: Popup
	,Tag: 'htk-dialog'
	,Properties:
	{
		/**
		 * The message displayed to the user.
		 */
		message:
		{ 
			type: String
			,set: function (x)
			{
				this._message = x;
			}
			,get: function ()
			{
				return this._message;
			}
		}
		/**
		 * The dialog icon.
		 */
		,icon:
		{ 
			type: String
			,set: function (x)
			{
				this._icon = x;
			}
			,get: function ()
			{
				return this._icon;
			}
		}
		/**
		 * The dialog buttons.
		 */
		,buttons:
		{
			enumType: Button
			,set: function (x)
			{
				this._buttons = x;
			}
			,get: function ()
			{
				return this._buttons;
			}
		}
	}
	
	,_modal: true
	,_icon: 'info'
	,_buttons: Button.ACCEPT
	
	,initialize: function (props)
	{
		this.parent (props);
		this.on ('closed', this._onClosed, this);
	}
	
	,open: function ()
	{
		this.parent ();
	
		// Dialog body

		var root = this.createElement ('div');
		root.className = 'htk-dialog';
		
		var body = this.createElement ('div');
		root.appendChild (body);
		
		if (this._icon)
		{
			var icon = new Htk.Icon ({
				doc: this.doc,
				icon: this._icon
			});
			body.appendChild (icon.node);
		}
		
		var p = this.createElement ('p');
		body.appendChild (p);
		
		if (this._message)
			p.appendChild (this.createTextNode (this._message));
		
		var clear = this.createElement ('div');
		clear.style.clear = 'both';
		body.appendChild (clear);

		// Button bar
		
		var buttonBar = this._buttonBar = this.createElement ('div');
		buttonBar.className = 'button-bar';
		root.appendChild (buttonBar);
		
		var i = labels.length;

		while (i--)
		if (this._buttons & labels[i].response)
			this.createButton (_(labels[i].label), labels[i].response);
		
		var clear = this.createElement ('div');
		clear.style.clear = 'both';
		root.appendChild (clear);

		this.childNode = root;
	}
	
	,createButton: function (label, response)
	{
		var button = this.createElement ('button');
		button.className = 'thin';
		button.appendChild (this.createTextNode (label));
		button.addEventListener ('click',
			this._onButtonClick.bind (this, response));
		this._buttonBar.appendChild (button);
	}
	
	,_onButtonClick: function (response)
	{
		this.hide ();
		this.signalEmit ('response', response);
	}
	
	,_onClosed: function ()
	{
		this.signalEmit ('response', null);
	}
});