<?php

namespace bff\validation\rules;

use Closure;
use bff\validation\Rule;

/**
 * Callback rule
 * @copyright Tamaranga
 */
class Callback extends Rule
{
    /**
     * @var Closure
     */
    protected $callback;

    protected function defaults($params)
    {
        if ($params instanceof Closure) {
            $params = ['callback' => $params];
        }
        return $params;
    }

    /**
     * @param Closure $callback
     * @return bool
     */
    protected function setCallback(Closure $callback)
    {
        if (! ($callback instanceof Closure)) {
            return false;
        }

        $this->callback = $callback;

        return true;
    }

    public function check(&$value)
    {
        $callback = $this->callback;

        $result = $callback($value, $this);

        if (is_string($result)) {
            $this->setMessage($result);
            return false;
        }
        return ! empty($result);
    }
}