<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\validators;

use Yii;

/**
 * BooleanValidator checks if the attribute value is a boolean value.
 *
 * Possible boolean values can be configured via the [[trueValue]] and [[falseValue]] properties.
 * And the comparison can be either [[strict]] or not.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class BooleanValidator extends Validator
{
	/**
	 * @var mixed the value representing true status. Defaults to '1'.
	 */
	public $trueValue = '1';
	/**
	 * @var mixed the value representing false status. Defaults to '0'.
	 */
	public $falseValue = '0';
	/**
	 * @var boolean whether the comparison to [[trueValue]] and [[falseValue]] is strict.
	 * When this is true, the attribute value and type must both match those of [[trueValue]] or [[falseValue]].
	 * Defaults to false, meaning only the value needs to be matched.
	 */
	public $strict = false;

	/**
	 * @inheritdoc
	 */
	public function init()
	{
		parent::init();
		if ($this->message === null) {
			$this->message = Yii::t('yii', '{attribute} must be either "{true}" or "{false}".');
		}
	}

	/**
	 * @inheritdoc
	 */
	protected function validateValue($value)
	{
		$valid = !$this->strict && ($value == $this->trueValue || $value == $this->falseValue)
			|| $this->strict && ($value === $this->trueValue || $value === $this->falseValue);
		if (!$valid) {
			return [$this->message, [
				'true' => $this->trueValue,
				'false' => $this->falseValue,
			]];
		} else {
			return null;
		}
	}

	/**
	 * @inheritdoc
	 */
	public function clientValidateAttribute($object, $attribute, $view)
	{
		$options = [
			'trueValue' => $this->trueValue,
			'falseValue' => $this->falseValue,
			'message' => Yii::$app->getI18n()->format($this->message, [
				'attribute' => $object->getAttributeLabel($attribute),
				'true' => $this->trueValue,
				'false' => $this->falseValue,
			], Yii::$app->language),
		];
		if ($this->skipOnEmpty) {
			$options['skipOnEmpty'] = 1;
		}
		if ($this->strict) {
			$options['strict'] = 1;
		}

		ValidationAsset::register($view);
		return 'yii.validation.boolean(value, messages, ' . json_encode($options) . ');';
	}
}
