import { readFileByLine } from './lib/fetch-text-by-line';
import Table from 'cli-table3';
import { fdir as Fdir } from 'fdir';
import { green, yellow } from 'picocolors';
import { processLineFromReadline } from './lib/process-line';
import { getHostname } from 'tldts';
import { OUTPUT_SURGE_DIR } from './constants/dir';

const PRESET_MITM_HOSTNAMES = [
  'dsp-x.jd.com',
  'bdsp-x.jd.com'
];

(async () => {
  const rulesets = await new Fdir()
    .withFullPaths()
    .crawl(OUTPUT_SURGE_DIR)
    .withPromise();

  const urlRegexPaths: Array<{ origin: string, processed: string }> = [];

  await Promise.all(rulesets.map(async file => {
    const content = await processLineFromReadline(readFileByLine(file));
    urlRegexPaths.push(
      ...content
        .filter(i => (
          i.startsWith('URL-REGEX')
          && !i.includes('http://')
        ))
        .map(i => i.split(',')[1])
        .map(i => ({
          origin: i,
          processed: i
            .replaceAll('^https?://', '')
            .replaceAll('^https://', '')
            .replaceAll('^http://', '')
            .split('/')[0]
            .replaceAll(String.raw`\.`, '.')
            .replaceAll('.+', '*')
            .replaceAll(String.raw`\d`, '*')
            .replaceAll('([a-z])', '*')
            .replaceAll('[a-z]', '*')
            .replaceAll('([0-9])', '*')
            .replaceAll('[0-9]', '*')
            .replaceAll(/{.+?}/g, '')
            .replaceAll(/\*+/g, '*')
        }))
    );
  }));

  const mitmDomains = new Set(PRESET_MITM_HOSTNAMES); // Special case for parsed failed
  const parsedFailures = new Set();

  const dedupedUrlRegexPaths = [...new Set(urlRegexPaths)];

  dedupedUrlRegexPaths.forEach(i => {
    const result = getHostnameSafe(i.processed);

    if (result) {
      mitmDomains.add(result);
    } else {
      parsedFailures.add(`${i.origin} ${i.processed} ${result}`);
    }
  });

  const mitmDomainsRegExpArray = Array.from(mitmDomains)
    .slice()
    .filter(i => {
      return i.length > 3
        && !i.includes('.mp4') // Special Case
        && i !== '(www.)' // Special Case
        && !(i !== '*.meituan.net' && i.endsWith('.meituan.net'))
        && !i.startsWith('.')
        && !i.endsWith('.')
        && !i.endsWith('*');
    })
    .map(i => {
      return new RegExp(
        escapeRegExp(i)
          .replaceAll('{www or not}', '(www.)?')
          .replaceAll(String.raw`\*`, '(.*)')
      );
    });

  const parsedTable = new Table({
    head: ['Hostname Pattern', 'Original Rules']
  });

  dedupedUrlRegexPaths.forEach(i => {
    const result = getHostnameSafe(i.processed);

    if (result) {
      if (matchWithRegExpArray(result, mitmDomainsRegExpArray)) {
        parsedTable.push([green(result), i.origin]);
      } else {
        parsedTable.push([yellow(result), i.origin]);
      }
    }
  });

  console.log('Mitm Hostnames:');
  console.log(`hostname = %APPEND% ${Array.from(mitmDomains).join(', ')}`);
  console.log('--------------------');
  console.log('Parsed Sucessed:');
  console.log(parsedTable.toString());
  console.log('--------------------');
  console.log('Parsed Failed');
  console.log(Array.from(parsedFailures).join('\n'));
})();

/** Util function */

function getHostnameSafe(input: string) {
  const res = getHostname(input);
  if (res && /[^\s\w*.-]/.test(res)) return null;
  return res;
}

function matchWithRegExpArray(input: string, regexps: RegExp[] = []) {
  for (const r of regexps) {
    if (r.test(input)) return true;
  }

  return false;
}

function escapeRegExp(string = '') {
  const reRegExpChar = /[$()*+.?[\\\]^{|}]/g;
  const reHasRegExpChar = new RegExp(reRegExpChar.source);

  return string && reHasRegExpChar.test(string)
    ? string.replaceAll(reRegExpChar, String.raw`\$&`)
    : string;
}