// @ts-check
const { fetchWithRetry } = require('./lib/fetch-retry');
const { createReadlineInterfaceFromResponse } = require('./lib/fetch-remote-text-by-line');
const path = require('path');
const { isIPv4, isIPv6 } = require('net');
const { processLine } = require('./lib/process-line');
const { createRuleset } = require('./lib/create-file');
const { task } = require('./lib/trace-runner');

const buildTelegramCIDR = task(__filename, async () => {
  /** @type {Response} */
  const resp = await fetchWithRetry('https://core.telegram.org/resources/cidr.txt');
  const lastModified = resp.headers.get('last-modified');
  const date = lastModified ? new Date(lastModified) : new Date();

  /** @type {string[]} */
  const results = [];

  for await (const line of createReadlineInterfaceFromResponse(resp)) {
    const cidr = processLine(line);
    if (!cidr) continue;

    const [subnet] = cidr.split('/');
    if (isIPv4(subnet)) {
      results.push(`IP-CIDR,${cidr},no-resolve`);
    }
    if (isIPv6(subnet)) {
      results.push(`IP-CIDR6,${cidr},no-resolve`);
    }
  }

  if (results.length === 0) {
    throw new Error('Failed to fetch data!');
  }

  const description = [
    'License: AGPL 3.0',
    'Homepage: https://ruleset.skk.moe',
    'GitHub: https://github.com/SukkaW/Surge',
    'Data from:',
    ' - https://core.telegram.org/resources/cidr.txt'
  ];

  return Promise.all(createRuleset(
    'Sukka\'s Ruleset - Telegram IP CIDR',
    description,
    date,
    results,
    'ruleset',
    path.resolve(__dirname, '../List/ip/telegram.conf'),
    path.resolve(__dirname, '../Clash/ip/telegram.txt')
  ));
});

module.exports.buildTelegramCIDR = buildTelegramCIDR;

if (import.meta.main) {
  buildTelegramCIDR();
}