<?php

function is_cli() {
    if (defined('STDIN')) {
        return true;
    }

    if (php_sapi_name() === 'cli') {
        return true;
    }

    if (array_key_exists('SHELL', $_ENV)) {
        return true;
    }

    if (empty($_SERVER['REMOTE_ADDR']) and ! isset($_SERVER['HTTP_USER_AGENT']) and count($_SERVER['argv']) > 0) {
        return true;
    }

    if (!array_key_exists('REQUEST_METHOD', $_SERVER)) {
        return true;
    }

    return false;
}

if (is_cli() === false) {
    echo('Unable to Start');
    exit(1);
}

function get_Windows_version() {
    $os_info = php_uname();
    
    // Regular expression pattern to extract version and build number
    $pattern = '/Windows\sNT\s(\d+\.\d+).*build\s(\d+)/';

    // Perform the regular expression match
    preg_match($pattern, $os_info, $matches);

    // Check if the match was successful
    if ($matches && count($matches) >= 3) {
        // Extracted version and build number
        $version = $matches[1];
        $build_number = $matches[2];

        // Return as an array
        return ['version' => $version, 'build' => $build_number];
    } else {
        // Return an empty array or handle the case when information is not found
        return [];
    }
}

function get_OS_information() {
    if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
        // Get Windows version information
        $windows_version = get_Windows_version();
        $build = $windows_version['build'] ?? false;
        $version = $windows_version['version'] ?? false;
        return ['name' => 'Windows', 'id' => 'win', 'build'=>$build, 'version_id'=>$version, 'id_like'=>'Windows'];
    }

    if (false == function_exists("shell_exec") || false == is_readable("/etc/os-release")) {
        return null;
    }

    $os = shell_exec('cat /etc/os-release');
    $list_ids = preg_match_all('/.*=/', $os, $match_list_ids);
    $list_ids = $match_list_ids[0];

    $list_val = preg_match_all('/=.*/', $os, $match_list_val);
    $list_val = $match_list_val[0];

    array_walk($list_ids, function(&$v, $k) {
        $v = strtolower(str_replace('=', '', $v));
    });

    array_walk($list_val, function(&$v, $k) {
        $v = preg_replace('/=|"/', '', $v);
    });

    return array_combine($list_ids, $list_val);
}

function is_string_found(string $data, string $find): bool {
    return (stripos($data, $find) !== false);
}

function get_left(string $str, int $length): string {
    return substr($str, 0, $length);
}

function get_right(string $str, int $length): string {
    return substr($str, -$length);
}

$os = get_OS_information();
$osVer = (isset($os['version_id'])) ? $os['version_id'] : false;
$codeName = (isset($os['version_codename'])) ? $os['version_codename'] : false;
$os_like = (isset($os['id_like'])) ? $os['id_like'] : false;