<?php

declare (strict_types=1);
/**
 * \DragonBe\Vies
 *
 * @author  Paweł Krzaczkowski <krzaczek+github@gmail.com>
 * @license  MIT
 */
namespace FormEnhancerDeps\DragonBe\Vies\Validator;

/**
 * Class ValidatorHU
 * @package DragonBe\Vies\Validator
 *
 * VAT format: [C1 C2 C3 C4 C5 C6 C7 C8]
 *
 * Range:
 *      C1 ... C8 Numeric from 0 to 9
 *
 * Rules:
 * C8
 *      A1 = 9*C1 + 7*C2 + 3*C3 + 1*C4 + 9*C5 + 7*C6 + 3*C7
 *      If the number in the right hand column of A1 is zero then C8 = 0
 *      Otherwise, subtract the number in the right hand column of A1 from 10
 *      C8 = A1
 */
class ValidatorHU extends ValidatorAbstract
{
    /**
     * {@inheritdoc}
     */
    public function validate(string $vatNumber): bool
    {
        if (strlen($vatNumber) != 8) {
            return \false;
        }
        $weights = [9, 7, 3, 1, 9, 7, 3];
        $checksum = (int) $vatNumber[7];
        $checkVal = $this->sumWeights($weights, $vatNumber);
        $checkVal = (int) substr((string) $checkVal, -1);
        $checkVal = $checkVal > 0 ? 10 - $checkVal : 0;
        return $checksum == $checkVal;
    }
}
