<?php

class uVoucher
{
    private $token;

    public function __construct($token)
    {
        $this->token = $token;
    }

    public function createVoucher($coin, $amount)
    {
        $url = 'https://api.uwallet.biz/v1/voucher';
        $data = [
            'coin' => $coin,
            'amount' => $amount
        ];

        return $this->sendRequest('POST', $url, $data);
    }

    public function redeemVoucher($coin, $voucherCode)
    {
        $url = 'https://api.uwallet.biz/v1/voucher/use';
        $data = [
            'coin' => $coin,
            'code' => $voucherCode
        ];

        return $this->sendRequest('POST', $url, $data);
    }

    public function getBalance()
    {
        $url = 'https://api.uwallet.biz/v1/wallet';
        return $this->sendRequest('GET', $url);
    }

    public function checkVoucherStatus($transactionId)
    {
        $url = 'https://api.uwallet.biz/v1/transaction';
        $data = ['id' => $transactionId];

        $response = $this->sendRequest('GET', $url, $data);
        return $response;
    }

    private function sendRequest($method, $url, $data = [])
    {
        $headers = [
            'Authorization: ' . $this->token,
            'Content-Type: application/json'
        ];

        $ch = curl_init();

        if ($method == 'POST') {
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
            curl_setopt($ch, CURLOPT_POST, true);
            curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
        } else {
            curl_setopt($ch, CURLOPT_URL, $url . '?' . http_build_query($data));
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        }

        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        $response = curl_exec($ch);
        $err = curl_error($ch);
        curl_close($ch);

        if ($err) {
            return "cURL Error: " . $err;
        } else {
            return json_decode($response);
        }
    }
}

$uVoucher = new uVoucher($uvoucherToken);