<?php

function mimeJson(): void { // return json mime type
    header('Content-Type: application/json; charset=utf-8');
}

function genStr(int $length, string $fillStr = ' '): string { // generate a string of specified length
    return str_pad('', $length, $fillStr);
}

function lenUtf8(string $str): int { // get string length (Chinese -> 2)
    return strlen(iconv('utf-8', 'gb2312', $str));
}

function isIPv4($ip): bool {
    return filter_var($ip, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV4);
}

function isIPv6($ip): bool {
    return filter_var($ip, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV6);
}

function isDomain($domain): bool {
    $regex = '/^(?=^.{3,255}$)[a-zA-Z0-9][-a-zA-Z0-9]{0,62}(\.[a-zA-Z0-9][-a-zA-Z0-9]{0,62})+$/';
    preg_match($regex, $domain, $match);
    return count($match) != 0;
}

function getKeys(bool $isWinServer = false): array { // get kms keys asset
    $keysAsset = json_decode(file_get_contents('../assets/kms-keys.json'), true);
    return $isWinServer ? array_reverse($keysAsset['win-server']) : $keysAsset['win'];
}

function getHost(): string {
    return $_SERVER['HTTP_HOST'] ?? 'KMS_HOST'; // TODO: remove port content
}

function officeInfo(): array { // office dir and kms key for different version
    return array(
        '2010' => ['Office14', 'VYBBJ-TRJPB-QFQRF-QFT4D-H3GVB'],
        '2013' => ['Office15', 'YC7DK-G2NP3-2QQC3-J6H88-GVGXT'],
        '2016' => ['Office16', 'XQNVK-8JYDB-WJ9W3-YJ8YR-WFG99'],
        '2019' => ['Office16', 'NMMKJ-6RK4F-KMJVX-8D9MJ-6MWKP'],
    );
}

function officeCommand(string $dir, string $key, string $host): string { // load office active command
    $command = 'if exist "%ProgramFiles%\Microsoft Office\\' . $dir . '\ospp.vbs" ';
    $command .= 'cd /d "%ProgramFiles%\Microsoft Office\\' . $dir . "\"\n";
    $command .= 'if exist "%ProgramFiles(x86)%\Microsoft Office\\' . $dir . '\ospp.vbs" ';
    $command .= 'cd /d "%ProgramFiles(x86)%\Microsoft Office\\' . $dir . "\"\n";
    $command .= "cscript ospp.vbs /inpkey:$key\n";
    $command .= "cscript ospp.vbs /sethst:$host\n";
    $command .= "cscript ospp.vbs /act\n";
    return $command . "cscript ospp.vbs /dstatus\n";
}

function osppCommand(string $host): array { // load office ospp command
    return array(
        '/dstatus' => ['Displays license information for installed product keys.', '显示当前已安装产品密钥的许可证信息'],
        '/dstatusall' => ['Displays license information for all installed licenses.', '显示当前已安装的所有许可证信息'],
        '/unpkey:XXXXX' => ['Uninstalls an product key with the last five digits of it.', '卸载已安装的产品密钥（最后5位）'],
        '/inpkey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX' => ['Installs a product key with a user-provided product key.', '安装产品密钥'],
        "/sethst:$host" => ['Sets a KMS host name with a user-provided host name.', '设置 KMS 主机名'],
        '/remhst' => ['Removes KMS host name and sets port to default.', '删除 KMS 主机名'],
        '/act' => ['Activates installed Office product keys.', '激活 Office'],
    );
}