<?php
function setPlainHeader() {
    header("Content-Type: text/plain");
}

function setJsonHeader() {
    header("Content-Type: application/json");
}

function getIPAddress() {
    return $_SERVER['REMOTE_ADDR'];
}

function newConnection($type = 1) {
    include __DIR__.'/../config/connection.php';

    try {
        return new mysqli(
            $type === 0 ? $games_db_host : $bd_db_host,
            $type === 0 ? $games_db_user : $bd_db_user,
            $type === 0 ? $games_db_pass : $bd_db_pass,
            $type === 0 ? $games_db_name : $bd_db_name,
            $type === 0 ? $games_db_port : $bd_db_port
        );
    } catch (mysqli_sql_exception $e) {
        exitWithMessage("-999");
    }
}

function getClientVersion() {
    return $_SERVER['HTTP_CLIENTVERSION'];
}

function encrypt($plainText) {
    include __DIR__.'/../config/encryption.php';
    $key = $SERVER_SEND_TRANSFER_KEY_SPECIFIC[getClientVersion()];
    if ($key == null) return;
    $iv = random_bytes(16);
    $cipher = openssl_encrypt($plainText, 'aes-256-cbc', $key, OPENSSL_RAW_DATA, $iv);
    return base64_encode($iv . $cipher);
}

function decrypt($dataB64) {
    include __DIR__.'/../config/encryption.php';
    $key = $SERVER_RECEIVE_TRANSFER_KEY_SPECIFIC[getClientVersion()];
    if ($key == null) return;
    $data = base64_decode($dataB64);
    $iv = substr($data, 0, 16);
    $cipher = substr($data, 16);
    $decrypted = openssl_decrypt($cipher, 'aes-256-cbc', $key, OPENSSL_RAW_DATA, $iv);
    if ($decrypted === false) {
        exit(encrypt('-997'));
    }
    return $decrypted;
}

function exitWithMessage($message, $encrypt = true) {
    if ($encrypt === true) {
        echo encrypt($message);
    } else {
        echo $message;
    }
    exit;
}

function getPostData() {
    $raw = file_get_contents("php://input");
    parse_str($raw, $postData);

    $decrypted = [];
    foreach ($postData as $k => $v) {
        $decKey = (getClientVersion() == "1.5.0" || getClientVersion() == "1.5.1") ? $k : decrypt($k);
        $decValue = decrypt($v);
        $decrypted[$decKey] = $decValue;
    }
    return $decrypted;
}

function uuidv4() {
    $data = random_bytes(16);
    $data[6] = chr((ord($data[6]) & 0x0f) | 0x40); 
    $data[8] = chr((ord($data[8]) & 0x3f) | 0x80);
    return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
}

function genTimestamp($time) {
    $time = time() - $time;
    $time = ($time < 1) ? 1 : $time;
    $tokens = array (31536000 => 'year', 2592000 => 'month', 604800 => 'week', 86400 => 'day', 3600 => 'hour', 60 => 'minute', 1 => 'second');
    foreach($tokens as $unit => $text) {
        if($time < $unit) continue;
        $numberOfUnits = floor($time / $unit);
        return $numberOfUnits . ' ' . $text . (($numberOfUnits > 1) ? 's' : '');
    }
}