import { fdir as Fdir } from 'fdir';
import path from 'node:path';
import fsp from 'node:fs/promises';
import { SOURCE_DIR } from './constants/dir';
import { readFileByLine } from './lib/fetch-text-by-line';
import { processLine } from './lib/process-line';
import { HostnameSmolTrie } from './lib/trie';

const ENFORCED_WHITELIST = [
  'hola.sk',
  'hola.org',
  'iadmatapk.nosdn.127.net',
  'httpdns.bilivideo.com',
  'httpdns-v6.gslb.yy.com',
  'twemoji.maxcdn.com',
  'samsungcloudsolution.com',
  'samsungcloudsolution.net',
  'samsungqbe.com'
];

const WHITELIST: string[] = ['.us-api.samsungyosemite.com', '.api-hub.samsungyosemite.com', '.holashop.org', '.solopools.net', '.hola-shopping.com', '.100xbtc.com', '.brdtest.co', '.yelts.net', '.axepool.com', '.luxxeeu.com', '.etc-pool.com', '.alph2mine.com', 'samsungcloudsolution.com', 'samsungcloudsolution.net', 'samsungqbe.com', 'lgtvsdp.com', '.apextop.cc', '.p2p-south.xyz', '.r-pool.net', '.celcoin.io', '.gameforxe.eu', '.kipcoin.org', '.cryptonote.club', '.12level.com', '.piratenbucht.eu', '.minersmine.com', '.blockhunter.info', '.hola.com.sg', '.down.my0115.ru', '.js.my0115.ru', '.wmi.my0115.ru', '.statistic.date', '.pawpools.space', '.nimbocoin.com', '.hola.hk', '.hola.sk', '.solopools.org', '.minereasy.com', '.mynextphone.io', '.newzgames.com'];

(async () => {
  const files = await new Fdir()
    .withFullPaths()
    .filter((filepath, isDirectory) => {
      if (isDirectory) return true;

      const extname = path.extname(filepath);

      return extname !== '.js' && extname !== '.ts';
    })
    .crawl(SOURCE_DIR)
    .withPromise();

  const whiteTrie = new HostnameSmolTrie(WHITELIST);
  ENFORCED_WHITELIST.forEach((item) => whiteTrie.whitelist(item));
  const whitelist = whiteTrie.dump();

  await Promise.all(files.map(file => dedupeFile(file, whitelist)));
})();

async function dedupeFile(file: string, whitelist: string[]) {
  const set = new Set<string>();
  const result: string[] = [];

  for await (const l of readFileByLine(file)) {
    const line = processLine(l);
    if (!line) {
      if (l.startsWith('# $ skip_dedupe_src')) {
        return;
      }

      result.push(l);
      continue;
    }

    if (set.has(line)) {
      continue;
    }

    // We can't use a trie here since we need to keep the order
    if (whitelist.some((whiteItem) => isDomainSuffix(whiteItem, line))) {
      continue;
    }

    set.add(line);
    result.push(line);
  }

  return fsp.writeFile(file, result.join('\n') + '\n');
}

function isDomainSuffix(whiteItem: string, incomingItem: string) {
  const whiteIncludeDomain = whiteItem[0] === '.';
  whiteItem = whiteItem[0] === '.' ? whiteItem.slice(1) : whiteItem;

  if (whiteItem === incomingItem) {
    return true; // as long as exact match, we don't care if subdomain is included or not
  }
  if (whiteIncludeDomain) {
    return incomingItem.endsWith('.' + whiteItem);
  }
  return false;
}