import { exec, ExecOptions } from 'child_process';
import { promisify } from 'util';

const execPromise = promisify(exec);

const ipv4Checkers = [
    'curl https://api.ipify.org 2>/dev/null',
    'curl https://ifconfig.me/ip 2>/dev/null',
    'curl https://ipinfo.io/ip 2>/dev/null',
    'curl https://ipecho.net/plain 2>/dev/null',
    'curl https://icanhazip.com/ 2>/dev/null',
    'curl https://checkip.amazonaws.com/ 2>/dev/null',
    'curl https://v4.ident.me/ 2>/dev/null',
    'curl https://ipv4bot.whatismyipaddress.com 2>/dev/null',
    'curl https://ip.seeip.org 2>/dev/null',
    'curl https://www.trackip.net/ip 2>/dev/null',
    'curl https://diagnostic.opendns.com/myip 2>/dev/null',
    'curl https://tnx.nl/ip 2>/dev/null',
    `dig -4 TXT +short o-o.myaddr.l.google.com @ns1.google.com|tr -d '"'`, // returns "ip" , tr -d '"' removes the "
    `dig -4 +short myip.opendns.com @resolver1.opendns.com`];

const checkIpv4 = async (options: ExecOptions = { timeout: 60 * 1000 }) =>
    (await Promise.all(ipv4Checkers.map(cmd => execPromise(cmd, options))))
        .map(result => result.stdout.trim())
        .reduce((wanIpMap, wanIp) => {
            if (0 === wanIp.search(/^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$/)) {
                if (!wanIpMap.has(wanIp)) {
                    wanIpMap.set(wanIp, 0);
                }

                wanIpMap.set(wanIp, 1 + wanIpMap.get(wanIp));
            }

            return wanIpMap;
        }, new Map<string, number>());

export {
    ipv4Checkers,
    checkIpv4
}