/**
 * ToggleWidget implements basic behavior of widgets with an on/off state.
 * Please see OO.ui.ToggleButtonWidget and OO.ui.ToggleSwitchWidget for examples.
 *
 * @abstract
 * @class
 * @extends OO.ui.Widget
 *
 * @constructor
 * @param {Object} [config] Configuration options
 * @cfg {boolean} [value=false] The toggle’s initial on/off state.
 *  By default, the toggle is in the 'off' state.
 */
OO.ui.ToggleWidget = function OoUiToggleWidget( config ) {
	// Configuration initialization
	config = config || {};

	// Parent constructor
	OO.ui.ToggleWidget.super.call( this, config );

	// Properties
	this.value = null;

	// Initialization
	this.$element.addClass( 'oo-ui-toggleWidget' );
	this.setValue( !!config.value );
};

/* Setup */

OO.inheritClass( OO.ui.ToggleWidget, OO.ui.Widget );

/* Events */

/**
 * @event change
 *
 * A change event is emitted when the on/off state of the toggle changes.
 *
 * @param {boolean} value Value representing the new state of the toggle
 */

/* Methods */

/**
 * Get the value representing the toggle’s state.
 *
 * @return {boolean} The on/off state of the toggle
 */
OO.ui.ToggleWidget.prototype.getValue = function () {
	return this.value;
};

/**
 * Set the state of the toggle: `true` for 'on', `false' for 'off'.
 *
 * @param {boolean} value The state of the toggle
 * @fires change
 * @chainable
 */
OO.ui.ToggleWidget.prototype.setValue = function ( value ) {
	value = !!value;
	if ( this.value !== value ) {
		this.value = value;
		this.emit( 'change', value );
		this.$element.toggleClass( 'oo-ui-toggleWidget-on', value );
		this.$element.toggleClass( 'oo-ui-toggleWidget-off', !value );
		this.$element.attr( 'aria-checked', value.toString() );
	}
	return this;
};