<?php

namespace bff\validation\rules;

use bff\validation\Rule;

/**
 * Regular expression rule
 * @copyright Tamaranga
 */
class Regexp extends Rule
{
    /**
     * @var string
     */
    protected $pattern;

    protected function defaults($params)
    {
        if (is_string($params)) {
            $params = ['pattern' => $params];
        }
        return $params;
    }

    /**
     * Set regexp pattern
     * @param string $pattern
     * @return bool
     */
    protected function setPattern($pattern)
    {
        if (empty($pattern) || ! is_string($pattern)) {
            return false;
        }

        $this->pattern = $pattern;

        return true;
    }

    /**
     * Set regexp pattern
     * @param string $pattern
     * @return static
     */
    public function pattern($pattern)
    {
        $this->setPattern($pattern);

        return $this;
    }

    public function check(&$value)
    {
        if (is_array($value)) {
            return false;
        }
        if (! $this->isNot()) {
            return preg_match($this->pattern, $value) > 0;
        } else {
            return preg_match($this->pattern, $value) < 1;
        }
    }
}