<?php

/**
 * @author Endre F. Kiss
 * @copyright 2015
 */

class Payment {
    private $FirstName;
    private $LastName;
    private $Currency;
    private $PaymentAmount;
    private $CreditCardNumber;
    private $CreditCardCCV;
    private $CreditCardExpirationMonth;
    private $CreditCardExpirationYear;
    private $Fields;
    private $url;

    public function __construct() {
        $this->Fields = Array(
            'FirstName'=>'First Name',
            'LastName'=>'Last Name',
            'Currency'=>'Currency',
            'PaymentAmount'=>'Payment Amount',
            'CreditCardNumber'=>'Credit CardNumber',
            'CreditCardCCV'=>'Credit Card CCV',
            'CreditCardExpirationMonth'=>'Credit Card Expiration Month',
            'CreditCardExpirationYear'=>'Credit Card Expiration Year'
            );
    }

    private function makePostData() {
        $sendArray = Array();
        foreach($this->Fields AS $key=>$value) {
            $sendArray[$key] = $this->$key;
        }
        return $sendArray;
    }

    public function setUrl($url) {
        $this->url = $url;
    }

    private function showAnswer($answer) {
        $items = "";
         foreach ($answer AS $key=>$value) {
            $items .= $this->template("result_item", Array("FIELD"=>$key, "VALUE"=>$value));
        }
        $content = $this->template("result", Array("RESULTS"=>$items));
        echo $this->template("index", Array("CONTENT"=>$content));
    }

    private function doPay() {
        $answer = $this->sendData();
        if (is_object($answer) && count($answer)>0) {
            $this->showAnswer($answer);
        } else {
            $this->payError();
        }
    }

    private function payError() {
        $content = $this->template("error", Array());
        echo $this->template("index", Array("CONTENT"=>$content));
    }

    private function sendData() {

        $postdata = $this->makePostData();

        $send = curl_init($this->url);
        curl_setopt($send, CURLOPT_USERAGENT, "Credit Card Checkout client");
        curl_setopt($send, CURLOPT_ENCODING, "UTF-8" );
        curl_setopt($send, CURLOPT_RETURNTRANSFER  ,1);
        curl_setopt($send, CURLOPT_POSTFIELDS, http_build_query($postdata));
        $ret = json_decode(curl_exec($send));

        $this->log($postdata, $ret);

        return $ret;
    }

    private function log($postdata, $ret) {
        $file = fopen("log/log.txt", "a");
        fwrite($file, "Time: ".date("Y-m-d H:i:s")."\n");
        fwrite($file, "Postdata: ".json_encode($postdata)."\n");
        fwrite($file, "Result: ".json_encode($ret)."\n\n");
        fclose($file);
    }

    public function startPay() {
        $errors = Array();
        $do = false;
        if (isset($_POST['gopay'])) {
            foreach($this->Fields AS $key=>$value) {
                if (strlen($_POST[$key])==0) {
                    $errors[] = $key;
                } else {
                    $this->$key = $_POST[$key];
                }
            }
            if (count($errors)==0) {
                $this->doPay();
                $do = true;
            }
        }
        if (!$do) $this->showForm($errors);
    }

    private function showForm($errors) {
        $fields = "";
        foreach($this->Fields AS $key=>$value) {
            if (in_array($key, $errors)) {
                $error = $this->template("field_error", Array("FIELD"=>$value));
            } else {
                $error = "";
            }
            $fields .= $this->template("form_field", Array("FIELD"=>$key,"NAME"=>$value,"VALUE"=>$this->$key,"ERROR"=>$error));
        }
        $form = $this->template("form", Array("FIELDS"=>$fields));
        echo $this->template("index", Array("CONTENT"=>$form));
    }

	private function template($file,$replace) {

		$tpl = "";
		$fileName = "template/".$file.".html";
		if (file_exists($fileName)) {

            $tpl = file_get_contents($fileName);

			foreach ($replace as $key=>$val) {
				if (is_array($val)) $val = current($val);
				$tpl = str_replace("{".$key."}",$val,$tpl);
			}
		} else $tpl = '<div>UNDEFINED TEMPLATE: '.$file.'</div>';

		return $tpl;
	}

}

?>