<?php
/**
 * @package     Joomla.Platform
 * @subpackage  Form
 *
 * @copyright   Copyright (C) 2005 - 2016 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE
 */

defined('JPATH_PLATFORM') or die;

/**
 * Form Field class for the Joomla Platform.
 * Single checkbox field.
 * This is a boolean field with null for false and the specified option for true
 *
 * @link   http://www.w3.org/TR/html-markup/input.checkbox.html#input.checkbox
 * @see    JFormFieldCheckboxes
 * @since  11.1
 */
class JFormFieldCheckbox extends JFormField
{
	/**
	 * The form field type.
	 *
	 * @var    string
	 * @since  11.1
	 */
	protected $type = 'Checkbox';

	/**
	 * The checked state of checkbox field.
	 *
	 * @var    boolean
	 * @since  3.2
	 */
	protected $checked = false;

	/**
	 * Method to get certain otherwise inaccessible properties from the form field object.
	 *
	 * @param   string  $name  The property name for which to the the value.
	 *
	 * @return  mixed  The property value or null.
	 *
	 * @since   3.2
	 */
	public function __get($name)
	{
		switch ($name)
		{
			case 'checked':
				return $this->checked;
		}

		return parent::__get($name);
	}

	/**
	 * Method to set certain otherwise inaccessible properties of the form field object.
	 *
	 * @param   string  $name   The property name for which to the the value.
	 * @param   mixed   $value  The value of the property.
	 *
	 * @return  void
	 *
	 * @since   3.2
	 */
	public function __set($name, $value)
	{
		switch ($name)
		{
			case 'checked':
				$value = (string) $value;
				$this->checked = ($value == 'true' || $value == $name || $value == '1');
				break;

			default:
				parent::__set($name, $value);
		}
	}

	/**
	 * Method to attach a JForm object to the field.
	 *
	 * @param   SimpleXMLElement  $element  The SimpleXMLElement object representing the `<field>` tag for the form field object.
	 * @param   mixed             $value    The form field value to validate.
	 * @param   string            $group    The field name group control value. This acts as as an array container for the field.
	 *                                      For example if the field has name="foo" and the group value is set to "bar" then the
	 *                                      full field name would end up being "bar[foo]".
	 *
	 * @return  boolean  True on success.
	 *
	 * @see     JFormField::setup()
	 * @since   3.2
	 */
	public function setup(SimpleXMLElement $element, $value, $group = null)
	{
		$return = parent::setup($element, $value, $group);

		if ($return)
		{
			$checked = (string) $this->element['checked'];
			$this->checked = ($checked == 'true' || $checked == 'checked' || $checked == '1');

			empty($this->value) || $this->checked ? null : $this->checked = true;
		}

		return $return;
	}

	/**
	 * Method to get the field input markup.
	 * The checked element sets the field to selected.
	 *
	 * @return  string  The field input markup.
	 *
	 * @since   11.1
	 */
	protected function getInput()
	{
		// Initialize some field attributes.
		$class     = !empty($this->class) ? ' class="' . $this->class . '"' : '';
		$disabled  = $this->disabled ? ' disabled' : '';
		$value     = !empty($this->default) ? $this->default : '1';
		$required  = $this->required ? ' required aria-required="true"' : '';
		$autofocus = $this->autofocus ? ' autofocus' : '';
		$checked   = $this->checked || !empty($this->value) ? ' checked' : '';

		// Initialize JavaScript field attributes.
		$onclick  = !empty($this->onclick) ? ' onclick="' . $this->onclick . '"' : '';
		$onchange = !empty($this->onchange) ? ' onchange="' . $this->onchange . '"' : '';

		// Including fallback code for HTML5 non supported browsers.
		JHtml::_('jquery.framework');
		JHtml::_('script', 'system/html5fallback.js', false, true);

		return '<input type="checkbox" name="' . $this->name . '" id="' . $this->id . '" value="'
			. htmlspecialchars($value, ENT_COMPAT, 'UTF-8') . '"' . $class . $checked . $disabled . $onclick . $onchange
			. $required . $autofocus . ' />';
	}
}
