<?php

class VoucherAPI
{
    private $apiKey;
    private $secKey;

    public function __construct($apiKey, $secKey)
    {
        $this->apiKey = $apiKey;
        $this->secKey = $secKey;
    }

    public function createVouchers($amount, $worthValue, $invoiceID)
    {
        $curl = curl_init();

        $securityHash = hash_hmac('sha512', $this->apiKey . ":" . $this->secKey . ":" . $amount . ":" . $invoiceID . ":" . $worthValue, $this->secKey);

        $baseUrl = "https://www.premiumvouchers.com/api/vouchers/CreateVouchers?";
        $params = "ApiKey=" . $this->apiKey . "&Amount=" . $amount . "&WorthValue=" . $worthValue . "&InvoiceID=" . $invoiceID . "&SecurityHash=" . $securityHash;

        curl_setopt_array($curl, array(
            CURLOPT_URL => $baseUrl . $params,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_ENCODING => "",
            CURLOPT_MAXREDIRS => 10,
            CURLOPT_TIMEOUT => 30,
            CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
            CURLOPT_CUSTOMREQUEST => "POST",
            CURLOPT_POSTFIELDS => "",
            CURLOPT_HTTPHEADER => array(
                "cache-control: no-cache"
            )
        ));

        $response = curl_exec($curl);
        $err = curl_error($curl);

        curl_close($curl);

        if ($err) {
            return "cURL Error #:" . $err;
        } else {
            return json_decode($response);
        }
    }

    public function redeemVouchers($voucherCode, $worthValue, $invoiceID)
    {
        $curl = curl_init();

        $securityHash = hash_hmac('sha512', $this->apiKey . ":" . $this->secKey . ":" . $voucherCode . ":" . $invoiceID . ":" . $worthValue, $this->secKey);

        $baseUrl = "https://www.premiumvouchers.com/api/vouchers/ReturnVouchers?";
        $params = "ApiKey=" . $this->apiKey . "&VoucherCode=" . $voucherCode . "&WorthValue=" . $worthValue . "&InvoiceID=" . $invoiceID . "&SecurityHash=" . $securityHash;

        curl_setopt_array($curl, array(
            CURLOPT_URL => $baseUrl . $params,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_ENCODING => "",
            CURLOPT_MAXREDIRS => 10,
            CURLOPT_TIMEOUT => 30,
            CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
            CURLOPT_CUSTOMREQUEST => "POST",
            CURLOPT_POSTFIELDS => "",
            CURLOPT_HTTPHEADER => array(
                "cache-control: no-cache"
            )
        ));

        $response = curl_exec($curl);
        $err = curl_error($curl);

        curl_close($curl);

        if ($err) {
            return "cURL Error #:" . $err;
        } else {
            return json_decode($response);
        }
    }

    public function getBalance()
    {
        $curl = curl_init();

        $baseUrl = "https://www.premiumvouchers.com/api/vouchers/GetBalance?";
        $params = "ApiKey=" . $this->apiKey;
        curl_setopt_array($curl, array(
            CURLOPT_URL => $baseUrl . $params,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_ENCODING => "",
            CURLOPT_MAXREDIRS => 10,
            CURLOPT_TIMEOUT => 30,
            CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
            CURLOPT_CUSTOMREQUEST => "POST",
            CURLOPT_POSTFIELDS => "",
            CURLOPT_HTTPHEADER => array(
                "cache-control: no-cache"
            )
        ));

        $response = curl_exec($curl);
        $err = curl_error($curl);

        curl_close($curl);

        if ($err) {
            return "cURL Error #:" . $err;
        } else {
            return json_decode($response);
        }
    }
}

$psVoucher = new VoucherAPI($permium_apiKey, $permium_secKey);