DragonBe/vies

<?php

declare (strict_types=1);

/**
 * \DragonBe\Vies
 *
 * @author  Paweł Krzaczkowski <krzaczek+github@gmail.com>
 * @license  MIT
 */

namespace DragonBe\Vies\Validator;

/**
 * Class ValidatorFI
 * @package DragonBe\Vies\Validator
 *
 * VAT format: [C1 C2 C3 C4 C5 C6 C7 C8]
 *
 * Range:
 *      C2 .. C8 Numeric from 0 to 9
 *
 * Rules:
 * C8
 *      R = 11 - (7*C1 + 9*C2 + 10*C3 + 5*C4 + 8*C5 + 4*C6 + 2*C7) modulo11
 *      If R = 10 then, VAT number is invalid
 *      If R = 11 then C8 = 0
 *      Else C8 = R
 */
class ValidatorFI extends ValidatorAbstract
{
    /**
     * {@inheritdoc}
     */
    public function validate(string $vatNumber): bool
    {
        if (strlen($vatNumber) != 8) {
            return false;
        }

        $weights = [7, 9, 10, 5, 8, 4, 2];
        $checkVal = $this->sumWeights($weights, $vatNumber);

        return (0 === $checkVal % 11)
            ? (int) $vatNumber[7] === 0
            : 11 - ($checkVal % 11) == (int) $vatNumber[7];
    }
}