<?php

class LastschriftPayment extends Payment {
	static $db = array(
		'TxnRef' => 'Text'
	);

	// DPS Informations

	protected static $privacy_link = '';

	protected static $logo = '';

	// URLs

	protected static $url = '';

	// Payment Informations

	protected static $username;

	protected static $password;

	static function set_account($username, $password) {
		self::$username = $username;
		self::$password = $password;
	}

	protected static $cvn_mode = true;

	static function unset_cvn_mode() {
		self::$cvn_mode = false;
	}

	protected static $credit_cards = array(

	);

	static function remove_credit_card($creditCard) {
		unset(self::$credit_cards[$creditCard]);
	}

	function getPaymentFormFields() {

		$privacyLink = '<a href="' . self::$privacy_link . '" target="_blank" title="Read DPS\'s privacy policy">' . $logo . '</a><br/>';
		$paymentsList = '';
		foreach(self::$credit_cards as $name => $image) $paymentsList .= '<img src="' . $image . '" alt="' . $name . '"/>';
		$fields = new FieldSet(
			new LiteralField('DPSInfo', $privacyLink),
			new LiteralField('DPSPaymentsList', $paymentsList),
			new TextField('DPS_CreditCardHolderName', 'Kontoinhaber :'),
			new TextField('DPS_CreditCardExpiry', 'Kontonummer:')
		);
		if(self::$cvn_mode) $fields->push(new TextField('DPS_CreditCardCVN', 'Bankleitzahl:'));
		return $fields;
	}

	/**
	 * Returns the required fields to add to the order form, when using this payment method.
	 */
	function getPaymentFormRequirements() {
		$jsCode = <<<JS
			require('DPS_CreditCardHolderName');
			require('DPS_CreditCardExpiry');
JS;
		$phpCode = '
			$this->requireField("DPS_CreditCardHolderName", $data);
			$this->requireField("DPS_CreditCardExpiry", $data);
		';
		return array('js' => $jsCode, 'php' => $phpCode);
	}

	function processPayment($data, $form) {

		// 1) Main Settings

		$inputs['PostUsername'] = self::$username;
		$inputs['PostPassword'] = self::$password;

		// 2) Payment Informations

		$inputs['Amount'] = $this->Amount;
		$inputs['InputCurrency'] = $this->Currency;
		$inputs['TxnId'] = $this->ID;
		$inputs['TxnType'] = 'Purchase';

		// 3) Credit Card Informations

		$inputs['CardHolderName'] = $data['DPS_Kontoinhaber'];
		$inputs['DateExpiry'] = $data['DPS_CreditCardExpiry'];
		if(self::$cvn_mode) $inputs['Cvc2'] = $data['DPS_CreditCardCVN'] ? $data['DPS_CreditCardCVN'] : '';

		// 4) DPS Transaction Sending

  		$responseFields = $this->doPayment($inputs);

		// 5) DPS Response Management

		if($responseFields['SUCCESS']) {
			$this->Status = 'Success';
			$result = new Payment_Success();
		}
		else {
			$this->Status = 'Failure';
			$result = new Payment_Failure();
		}

		if($transactionRef = $responseFields['DPSTXNREF']) $this->TxnRef = $transactionRef;

		if($helpText = $responseFields['HELPTEXT']) $this->Message = $helpText;
		else if($responseText = $responseFields['RESPONSETEXT']) $this->Message = $responseText;

		$this->write();
		return $result;
	}

	function doPayment(array $inputs) {

		// 1) Transaction Creation
		$transaction = "<Txn>";
		foreach($inputs as $name => $value) {
			if($name == "Amount") {
				$value = number_format($value, 2, '.', '');
			}
			$transaction .= "<$name>$value</$name>";
		}
		$transaction .= "</Txn>";

		// 2) CURL Creation

		$clientURL = curl_init();
		curl_setopt($clientURL, CURLOPT_URL, self::$url);
		curl_setopt($clientURL, CURLOPT_POST, 1);
		curl_setopt($clientURL, CURLOPT_POSTFIELDS, $transaction);
		curl_setopt($clientURL, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt($clientURL, CURLOPT_SSLVERSION, 3);

		// 3) CURL Execution

		$resultXml = curl_exec($clientURL);

		// 4) CURL Closing

		curl_close ($clientURL);

		// 5) XML Parser Creation

		$xmlParser = xml_parser_create();
		$values = null;
		$indexes = null;


		xml_parse_into_struct($xmlParser, $resultXml, $values, $indexes);
		xml_parser_free($xmlParser);

		// 6) XML Result Parsed In A PHP Array

		$resultPhp = array();
		$level = array();
		foreach($values as $xmlElement) {
			if($xmlElement['type'] == 'open') {
				if(array_key_exists('attributes', $xmlElement)) list($level[$xmlElement['level']], $extra) = array_values($xmlElement['attributes']);
				else $level[$xmlElement['level']] = $xmlElement['tag'];
			}
			else if ($xmlElement['type'] == 'complete') {
				$startLevel = 1;
				$phpArray = '$resultPhp';
				while($startLevel < $xmlElement['level']) $phpArray .= '[$level['. $startLevel++ .']]';
				$phpArray .= '[$xmlElement[\'tag\']] = array_key_exists(\'value\', $xmlElement)? $xmlElement[\'value\'] : null;';
				eval($phpArray);
			}
		}

		$result = $resultPhp['TXN'];

		return $result;
	}
}

?>