<?php

Class VAT {

	private $soap;

	private static function respond($vatResult = null) {
		$results = [
			'C' => [
				"registered" => true,
				"shortMessage" => "Czynny",
			],
			'N' => [
				"registered" => false,
				"shortMessage" => "Niezarejestrowany",
			],
			'Z' => [
				"registered" => true,
				"shortMessage" => "Zwolniony"
			],
			'I' => [
				"registered" => false,
				"shortMessage" => "Niepoprawny NIP"
			],
		];

		if (is_array($vatResult)) $vatResult = (object) $vatResult;
		if ((!is_object($vatResult)) || (!isset($results[$vatResult->Kod]))) {
			$result = [
				'registered' => null,
				'shortMessage' => 'Nieznany rezultat',
				'message' => 'Nieznany rezultat',
			];
		} else {
			$result = [
				'registered' => $results[$vatResult->Kod]['registered'],
				'shortMessage' => $results[$vatResult->Kod]['shortMessage'],
				'message' => $vatResult->Komunikat,
			];
		}
		return (object) $result;
	}

	private static function validateNIP(&$nip) {
		$prefix = substr($nip, 0, 2);
		if (!is_numeric($prefix)) $nip = substr($nip, 2);
		else $prefix = null;
		if ($prefix && $prefix != "PL") return false;
		if (strlen($nip) != 10 || (!is_numeric($nip))) return false;
		$control = (($nip[0] * 6 + $nip[1] * 5 + $nip[2] * 7 + $nip[3] * 2 + $nip[4] * 3 + $nip[5] * 4 + $nip[6] * 5 + $nip[7] * 6 + $nip[8] * 7) % 11 ) % 10;
		return ($control == $nip[9]);
	}

	public function getVATStatus($nip) {
		if (!self::validateNIP($nip)) return self::respond(['Kod' => 'I', 'Komunikat' => 'Niepoprawny NIP']);
		try {
			$result = $this->soap->SprawdzNIP($nip);
		} catch (Exception $e) {
			return self::respond();
		}
		return self::respond($result);
	}

	function __construct() {
		$this->soap = new SoapClient("https://sprawdz-status-vat.mf.gov.pl/?wsdl");
	}

	function __destruct() {
		unset($this->soap);
	}
}