require('dotenv').config({ quiet: true });
const mysql = require('mysql2/promise');
(async () => {
  let db;
  try {
    const u = new URL(process.env.DATABASE_URL);
    const name = u.pathname.slice(1);
    if (!/^[a-zA-Z0-9_]+$/.test(name)) throw Error();
    db = await mysql.createConnection({
      host: u.hostname,
      port: Number(u.port || 3306),
      user: decodeURIComponent(u.username),
      password: decodeURIComponent(u.password),
    });
    const [existing] = await db.execute(
      'SELECT SCHEMA_NAME FROM information_schema.SCHEMATA WHERE SCHEMA_NAME=?',
      [name],
    );
    if (existing.length) {
      const [tables] = await db.execute(
        'SELECT TABLE_NAME FROM information_schema.TABLES WHERE TABLE_SCHEMA=?',
        [name],
      );
      console.log(
        'Database already exists; tables:',
        tables.map((t) => t.TABLE_NAME),
      );
    } else {
      await db.query(
        'CREATE DATABASE `' + name + '` CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci',
      );
      console.log('Created new empty project database.');
    }
  } catch (e) {
    console.error('Database preflight failed:', e.code || 'configuration error');
    process.exitCode = 1;
  } finally {
    if (db) await db.end();
  }
})();