<?php

function encrypt_e($input, $ky) {
    $key = html_entity_decode($ky);
    $iv = "@@@@&&&&####$$$$";
    $data = openssl_encrypt($input, "AES-128-CBC", $key, 0, $iv);
    return $data;
}

function decrypt_e($crypt, $ky) {
    $key = html_entity_decode($ky);
    $iv = "@@@@&&&&####$$$$";
    $data = openssl_decrypt($crypt, "AES-128-CBC", $key, 0, $iv);
    return $data;
}

function generateSalt_e($length) {
    $random = "";
    srand((int) ((double) microtime(true) * 1000000)); // Fix for deprecation
    $data = "AbcDE123IJKLMN67ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    $data .= "aBCdefghijklmn123opq45rs67tuv89wxyz";
    $data .= "0FGH45OP89";

    for ($i = 0; $i < $length; $i++) {
        $random .= substr($data, (rand() % strlen($data)), 1);
    }

    return $random;
}

function checkString_e($value) {
    return ($value === 'null') ? '' : $value;
}

function getChecksumFromArray($arrayList, $key, $sort = 1) {
    if ($sort != 0) {
        ksort($arrayList);
    }
    // Convert all values to strings
    $arrayList = array_map('strval', $arrayList);
    $str = getArray2Str($arrayList);
    $salt = generateSalt_e(4);
    $finalString = $str . "|" . $salt;
    $hash = hash("sha256", $finalString);
    $hashString = $hash . $salt;
    $checksum = encrypt_e($hashString, $key);
    return $checksum;
}

function getChecksumFromString($str, $key) {
    $salt = generateSalt_e(4);
    $finalString = $str . "|" . $salt;
    $hash = hash("sha256", $finalString);
    $hashString = $hash . $salt;
    $checksum = encrypt_e($hashString, $key);
    return $checksum;
}

function verifychecksum_e($arrayList, $key, $checksumvalue) {
    $arrayList = removeCheckSumParam($arrayList);
    ksort($arrayList);
    $str = getArray2StrForVerify($arrayList);
    $paytm_hash = decrypt_e($checksumvalue, $key);
    $salt = substr($paytm_hash, -4);
    $finalString = $str . "|" . $salt;
    $website_hash = hash("sha256", $finalString);
    $website_hash .= $salt;
    return ($website_hash === $paytm_hash) ? "TRUE" : "FALSE";
}

function getArray2Str($arrayList) {
    $paramStr = "";
    $flag = 1;
    foreach ($arrayList as $key => $value) {
        if (strpos($value, 'REFUND') !== false || strpos($value, '|') !== false) {
            continue;
        }
        $paramStr .= ($flag) ? checkString_e($value) : "|" . checkString_e($value);
        $flag = 0;
    }
    return $paramStr;
}

function getArray2StrForVerify($arrayList) {
    $paramStr = "";
    $flag = 1;
    foreach ($arrayList as $key => $value) {
        $paramStr .= ($flag) ? checkString_e($value) : "|" . checkString_e($value);
        $flag = 0;
    }
    return $paramStr;
}

function removeCheckSumParam($arrayList) {
    if (isset($arrayList["CHECKSUMHASH"])) {
        unset($arrayList["CHECKSUMHASH"]);
    }
    return $arrayList;
}

function callAPI($apiURL, $requestParamList) {
    $JsonData = json_encode($requestParamList);
    $postData = 'JsonData=' . urlencode($JsonData);
    $ch = curl_init($apiURL);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
    curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json', 'Content-Length: ' . strlen($postData)));
    $jsonResponse = curl_exec($ch);
    return json_decode($jsonResponse, true);
}

function callRefundAPI($refundApiURL, $requestParamList) {
    $JsonData = json_encode($requestParamList);
    $postData = 'JsonData=' . urlencode($JsonData);
    $ch = curl_init($refundApiURL);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
    curl_setopt($ch, CURLOPT_URL, $refundApiURL);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
    $jsonResponse = curl_exec($ch);
    return json_decode($jsonResponse, true);
}
?>