<?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;
use Kant\Exception\InvalidConfigException;
use Kant\Helper\Html;
use Kant\Helper\JsExpression;
use Kant\Helper\Json;

/**
 * RegularExpressionValidator validates that the attribute value matches the specified [[pattern]].
 *
 * If the [[not]] property is set true, the validator will ensure the attribute value do NOT match the [[pattern]].
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class RegularExpressionValidator extends Validator
{

    /**
     *
     * @var string the regular expression to be matched with
     */
    public $pattern;

    /**
     *
     * @var boolean whether to invert the validation logic. Defaults to false. If set to true,
     *      the regular expression defined via [[pattern]] should NOT match the attribute value.
     */
    public $not = false;

    /**
     * @inheritdoc
     */
    public function init()
    {
        parent::init();
        if ($this->pattern === null) {
            throw new InvalidConfigException('The "pattern" property must be set.');
        }
        if ($this->message === null) {
            $this->message = Kant::t('kant', '{attribute} is invalid.');
        }
    }

    /**
     * @inheritdoc
     */
    protected function validateValue($value)
    {
        $valid = ! is_array($value) && (!$this->not && preg_match($this->pattern, $value) || $this->not && ! preg_match($this->pattern, $value));
        
        return $valid ? null : [
            $this->message,
            []
        ];
    }

    /**
     * @inheritdoc
     */
    public function clientValidateAttribute($model, $attribute, $view)
    {
        $pattern = Html::escapeJsRegularExpression($this->pattern);
        
        $options = [
            'pattern' => new JsExpression($pattern),
            'not' => $this->not,
            'message' => Kant::$app->getI18n()->format($this->message, [
                'attribute' => $model->getAttributeLabel($attribute)
            ], Kant::$app->language)
        ];
        if ($this->skipOnEmpty) {
            $options['skipOnEmpty'] = 1;
        }
        
        ValidationAsset::register($view);
        
        return 'kant.validation.regularExpression(value, messages, ' . Json::htmlEncode($options) . ');';
    }
}
