import { fetchRemoteTextByLine } from './lib/fetch-text-by-line';
import { createRuleset } from './lib/create-file';
import { processLineFromReadline } from './lib/process-line';
import { task } from './trace';

import { exclude } from 'fast-cidr-tools';
import { createMemoizedPromise } from './lib/memo-promise';
import { CN_CIDR_NOT_INCLUDED_IN_CHNROUTE, NON_CN_CIDR_INCLUDED_IN_CHNROUTE } from './constants/cidr';
import { appendArrayInPlace } from './lib/append-array-in-place';
import { output } from './lib/misc';

export const getChnCidrPromise = createMemoizedPromise(async () => {
  const cidr4 = await processLineFromReadline(await fetchRemoteTextByLine('https://raw.githubusercontent.com/misakaio/chnroutes2/master/chnroutes.txt'));
  const cidr6 = await processLineFromReadline(await fetchRemoteTextByLine('https://gaoyifan.github.io/china-operator-ip/china6.txt'));

  appendArrayInPlace(cidr4, CN_CIDR_NOT_INCLUDED_IN_CHNROUTE);
  return [exclude(cidr4, NON_CN_CIDR_INCLUDED_IN_CHNROUTE, true), cidr6] as const;
});

export const buildChnCidr = task(require.main === module, __filename)(async (span) => {
  const [filteredCidr4, cidr6] = await span.traceChildAsync('download chnroutes2', getChnCidrPromise);

  // Can not use SHARED_DESCRIPTION here as different license
  const description = [
    'License: CC BY-SA 2.0',
    'Homepage: https://ruleset.skk.moe',
    'GitHub: https://github.com/SukkaW/Surge',
    ''
  ];

  // Can not use createRuleset here, as Clash support advanced ipset syntax
  return Promise.all([
    createRuleset(
      span,
      'Sukka\'s Ruleset - Mainland China IPv4 CIDR',
      [
        ...description,
        'Data from https://misaka.io (misakaio @ GitHub)'
      ],
      new Date(),
      filteredCidr4,
      'ipcidr',
      ...output('china_ip', 'ip')
    ),
    createRuleset(
      span,
      'Sukka\'s Ruleset - Mainland China IPv6 CIDR',
      [
        ...description,
        'Data from https://github.com/gaoyifan/china-operator-ip'
      ],
      new Date(),
      cidr6,
      'ipcidr6',
      ...output('china_ip_ipv6', 'ip')
    )
  ]);
});