import fs from 'node:fs';
import path, { dirname } from 'node:path';
import { fileURLToPath } from 'node:url';

const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

import yaml from 'js-yaml';

// Regex special characters that indicate we need actual regex
const regexSpecialChars = /[|^$.*+?(){}[\]\\]/;

function transformBots(bots: any[]): any[] {
  return bots.map((bot) => {
    const { regex, ...rest } = bot;
    const hasRegexChars = regexSpecialChars.test(regex);

    if (hasRegexChars) {
      // Keep as regex
      return { regex, ...rest };
    }
    // Convert to includes
    return { includes: regex, ...rest };
  });
}

async function main() {
  // Get document, or throw exception on error
  try {
    const data = await fetch(
      'https://raw.githubusercontent.com/matomo-org/device-detector/master/regexes/bots.yml'
    ).then((res) => res.text());

    const parsedData = yaml.load(data) as any[];
    const transformedBots = transformBots(parsedData);

    fs.writeFileSync(
      path.resolve(__dirname, '../src/bots/bots.ts'),
      [
        '// This file is generated by the script get-bots.ts',
        '',
        '// The data is fetch from device-detector https://raw.githubusercontent.com/matomo-org/device-detector/master/regexes/bots.yml',
        '',
        `const bots = ${JSON.stringify(transformedBots, null, 2)} as const;`,
        'export default bots;',
        '',
      ].join('\n'),
      'utf-8'
    );

    console.log(
      `✅ Generated bots.ts with ${transformedBots.length} bot entries`
    );
    const regexCount = transformedBots.filter((b) => 'regex' in b).length;
    const includesCount = transformedBots.filter((b) => 'includes' in b).length;
    console.log(`   - ${includesCount} simple string matches (includes)`);
    console.log(`   - ${regexCount} regex patterns`);
  } catch (e) {
    console.log(e);
  }
}

main();