<?php

/**
 * @package KantPHP
 * @author  Zhenqiang Zhang <zhenqiang.zhang@hotmail.com>
 * @copyright (c) KantPHP Studio, All rights reserved.
 * @license http://www.opensource.org/licenses/BSD-3-Clause  The BSD 3-Clause License
 */
namespace Kant\Validators;

use Kant\Kant;

/**
 * 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 = Kant::t('kant', '{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 === true ? 'true' : $this->trueValue,
                    'false' => $this->falseValue === false ? 'false' : $this->falseValue
                ]
            ];
        }
        
        return null;
    }

    /**
     * @inheritdoc
     */
    public function clientValidateAttribute($model, $attribute, $view)
    {
        $options = [
            'trueValue' => $this->trueValue,
            'falseValue' => $this->falseValue,
            'message' => Kant::$app->getI18n()->format($this->message, [
                'attribute' => $model->getAttributeLabel($attribute),
                'true' => $this->trueValue === true ? 'true' : $this->trueValue,
                'false' => $this->falseValue === false ? 'false' : $this->falseValue
            ], Kant::$app->language)
        ];
        if ($this->skipOnEmpty) {
            $options['skipOnEmpty'] = 1;
        }
        if ($this->strict) {
            $options['strict'] = 1;
        }
        
        ValidationAsset::register($view);
        
        return 'kant.validation.boolean(value, messages, ' . json_encode($options, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE) . ');';
    }
}
