import { isIP } from 'node:net';
import { pathToFileURL } from 'node:url';

export async function checkIp(ip, apiKey) {
  if (!isIP(ip)) throw new Error('Supply a valid public IP address.');
  if (!apiKey) throw new Error('Set PROXYRADAR_API_KEY on your server.');
  const url = new URL('https://proxyradar.io/v1/check');
  url.search = new URLSearchParams({ ip, format: 'json' }).toString();
  let response;
  try {
    response = await fetch(url, {
      headers: { Authorization: `Bearer ${apiKey}`, Accept: 'application/json' },
      signal: AbortSignal.timeout(15000),
      redirect: 'error',
    });
  } catch {
    throw new Error('Lookup unavailable; result is unknown.');
  }
  if (!response.ok) {
    throw new Error(`Lookup unavailable (HTTP ${response.status}); result is unknown.`);
  }
  try {
    const body = await response.text();
    if (body.length > 65536) throw new Error('Response too large');
    const data = JSON.parse(body);
    if (data?.status !== 'success' || ![0, 1].includes(data.proxy)) {
      throw new Error('Unexpected verdict');
    }
    return { ip: data.ip, proxy: data.proxy, flags: data.flags };
  } catch {
    throw new Error('Invalid lookup response; result is unknown.');
  }
}

if (process.argv[1] && import.meta.url === pathToFileURL(process.argv[1]).href) {
  try {
    const result = await checkIp(process.argv[2] || '', process.env.PROXYRADAR_API_KEY);
    console.log(JSON.stringify(result, null, 2));
  } catch (error) {
    console.error(error.message);
    process.exitCode = 1;
  }
}