<?php
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\
 *
 *  Value Add Tax (VAT) library
 *  Author: Mariusz Muszyński
 *
 *  Public static methods:
 *
 *    public bool VAT::validateNIP ( string $nip )
 *      Tells whether the given string is a correct polish tax identification number (TIN/NIP)
 *
 *      Parameters:
 *
 *        nip
 *          Polish tax identification number
 *
 *  Public dynamic methods:
 *
 *    public VAT::__construct ( void )
 *      Creates a new VAT object.
 *
 *    public bool VAT::isActiveVatPayer ( string $nip )
 *      Tells whether the given NIP belongs to an active VAT payer
 *
 *      Parameters:
 *
 *        nip
 *          Polish tax identification number
 *
 *    public mixed VAT::getMessage ( [ bool $whole = false ] )
 *      Returns last message after using VAT::isActiveVatPayer
 *
 *      Parameters:
 *
 *        whole
 *          When TRUE, whole message is returned as an array
 *          When FALSE, only main message is returned as a string
 *
 *  HINT:
 *    It's faster to create one object and do many executes of VAT::isActiveVatPayer method
 *    than creating separate objects for each VAT::isActiveVatPayer execute.
 *
 * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 *
 *  An example of usage:
 *
 *  $vat = new VAT();
 *  $nip_array = ["5932268672", "6040018535"];
 *  foreach ($nip_array as $nip)
 *  {
 *      echo $nip . " - ";
 *      try
 *      {
 *          $result = $vat->isActiveVatPayer($nip);
 *          if ($result) echo "is active VAT payer";
 *          else echo "is not active VAT payer";
 *          echo " (" . $vat->getMessage() . ")\n";
 *      }
 *      catch (Exception $e)
 *      {
 *          echo "An error occurred (" . $e->getMessage() . ")\n";
 *      }
 *  }
 *
\* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

Class VAT_old {

	private $ch, $dom, $headers;
	private $cookies = "php://memory";
	private $message = [];
	private $initialized = false;
	private $messages = [
		"Podmiot o podanym identyfikatorze podatkowym NIP jest zarejestrowany jako podatnik VAT czynny" => [
			"active" => true,
			"shortMessage" => "Czynny",
		],
		"Podmiot o podanym identyfikatorze podatkowym NIP nie jest zarejestrowany jako podatnik VAT" => [
			"active" => false,
			"shortMessage" => "Niezarejestrowany",
		],
		"Podmiot o podanym identyfikatorze podatkowym NIP jest zarejestrowany jako podatnik VAT zwolniony" => [
			"active" => true,
			"shortMessage" => "Zwolniony"
		],
		"Niepoprawny Numer Identyfikacji Podatkowej" => [
			"active" => false,
			"shortMessage" => "Niepoprawny NIP"
		],
	];

	private function getHeaders($ch, $header) {
		$len = strlen($header);
		$header = explode(':', $header, 2);
		if (count($header) < 2) return $len;
		$this->headers[trim($header[0])] = trim($header[1]);
		return $len;
	}

	private function checkHeaders() {
		if (!(isset($this->headers['Fast-Ver-Last']) && $this->headers['Fast-Ver-Last'])) throw new Exception("Błąd danych ze strony Ministerstwa Finansów");
	}

	public 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]);
	}

	private static function paramsUrlEncode($params) {
		$array = [];
		foreach ($params as $param => $value) $array[] = $param . "=" . urlencode($value);
		return implode("&", $array);
	}

	private function execute() {
		$this->headers = [];
		$result = curl_exec($this->ch);
		if ($result === false) throw new Exception("Błąd połączenia ze stroną Ministerstwa Finansów");
		if (curl_getinfo($this->ch)['http_code'] != 200) throw new Exception("Błąd odbierania danych ze strony Ministerstwa Finansów");
		return $result;
	}

	private function initialize() {
		$this->ch = curl_init();
#		curl_setopt($this->ch, CURLOPT_URL, "http://www.finanse.mf.gov.pl/web/wp/pp/sprawdzanie-statusu-podmiotu-w-vat");
		curl_setopt($this->ch, CURLOPT_URL, "https://ppuslugi.mf.gov.pl/?link=NIP&;");
		curl_setopt($this->ch, CURLOPT_RETURNTRANSFER, true);
		curl_setopt($this->ch, CURLOPT_FOLLOWLOCATION, true);
		curl_setopt($this->ch, CURLOPT_SSL_VERIFYHOST, false);
		curl_setopt($this->ch, CURLOPT_SSL_VERIFYPEER, false);
		curl_setopt($this->ch, CURLOPT_CONNECTTIMEOUT, 5);
		curl_setopt($this->ch, CURLOPT_TIMEOUT, 5);
		curl_setopt($this->ch, CURLOPT_COOKIEJAR, $this->cookies);
		curl_setopt($this->ch, CURLOPT_COOKIEFILE, $this->cookies);
		curl_setopt($this->ch, CURLOPT_HEADERFUNCTION, "self::getHeaders");
		$this->execute();
		
		$this->checkHeaders();
		$params = [
			"Load" => "1",
			"FAST_VERLAST__" => $this->headers['Fast-Ver-Last'],
		];
		curl_setopt($this->ch, CURLOPT_URL, "https://ppuslugi.mf.gov.pl/_/?" . self::paramsUrlEncode($params));
		$this->execute();

		curl_setopt($this->ch, CURLOPT_URL, "https://ppuslugi.mf.gov.pl/_/EventOccurred");
		$this->initialized = true;
	}

	private function reinitialize() {
		$this->checkHeaders();
		$params = [
			"DOC_MODAL_ID__" => "0",
			"EVENT__" => "b-9",
			"FAST_VERLAST__" => $this->headers['Fast-Ver-Last'],
		];
		curl_setopt($this->ch, CURLOPT_POSTFIELDS, self::paramsUrlEncode($params));
		$this->execute();
	}

	private function getResult($result) {
		$search = ['/\<br(\s*)?\/?\>/i', '/[[:blank:]]{2,}/', '/[\x00-\x1F\x80-\xFF]/'];
		$replace = ['|', ' ', ''];
		$json = preg_replace($search, $replace, $result);
		$array = json_decode($json, true);
		if (!($array && isset($array['html']))) throw new Exception("Błąd danych ze strony Ministerstwa Finansów");
		$html = $array['html'];
		$this->dom->loadHTML(mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8'));
		$this->message = array_map("trim", array_values(array_diff(explode("|", $this->dom->getElementById("caption2_b-3")->textContent), [''])));
		if (!$this->message) {
			$this->message = array_map("trim", array_values(array_diff(explode("\n", $this->dom->getElementById("indicator_b-7")->getAttribute("title")), [''])));
			if ($this->message) {
//				throw new Exception($this->message[0]);
			}
			else throw new Exception("Błąd danych ze strony Ministerstwa Finansów");
		}
		if (isset($this->messages[$this->message[0]])) return $this->messages[$this->message[0]]['active'];
		else throw new Exception("Nieznany rezultat");
	}

	public function getMessage($whole = false) {
		if (!$this->message) $this->message = ["Brak wyniku"];
		if ($whole) return $this->message;
		else return $this->message[0];
	}

	public function getShortMessage() {
		if (!$this->message) return "Brak wyniku";
		if (!isset($this->messages[$this->message[0]])) return "Nieznany rezultat";
		return $this->messages[$this->message[0]]['shortMessage'];
	}

	public function isActiveVatPayer($nip) {
		$this->message = [];
		$nip = str_replace("-", "", trim($nip));
		if (!$this->validateNIP($nip)) {
			$this->message = ["Niepoprawny Numer Identyfikacji Podatkowej"];
			return false;
//			throw new Exception("Błędny NIP");
		}

		if (!$this->initialized) $this->initialize();
		else $this->reinitialize();

		$this->checkHeaders();
		$params = [
			"b-7" => $nip,
			"DOC_MODAL_ID__" => "0",
			"EVENT__" => "b-8",
			"FAST_VERLAST__" => $this->headers['Fast-Ver-Last'],
		];
		curl_setopt($this->ch, CURLOPT_POSTFIELDS, self::paramsUrlEncode($params));
		return $this->getResult($this->execute());
	}

	function __construct() {
		$this->dom = new DOMDocument();
	}

	function __destruct() {
		if ($this->ch) curl_close($this->ch);
	}
}