const TEST_DB = 'ppaimt_crest_test';

export async function setup() {
  const dotenv = await import('dotenv');
  dotenv.config({ path: new URL('../.env', import.meta.url), quiet: true });
  process.env.NODE_ENV = 'test';
  process.env.DB_NAME = TEST_DB;
  process.env.DATA_ENCRYPTION_KEY = 'BwcHBwcHBwcHBwcHBwcHBwcHBwcHBwcHBwcHBwcHBwc=';

  if (!/^[A-Za-z0-9_]+$/.test(TEST_DB)) {
    throw new Error('Invalid test database name');
  }

  if (!process.env.DB_USER) {
    throw new Error('DB_USER is required in backend/.env before tests can migrate');
  }

  const mysql = await import('mysql2/promise');
  const connection = await mysql.createConnection({
    host: process.env.DB_HOST || '127.0.0.1',
    port: Number(process.env.DB_PORT || 3306),
    user: process.env.DB_USER,
    password: process.env.DB_PASSWORD ?? '',
  });
  await connection.query(
    `CREATE DATABASE IF NOT EXISTS \`${TEST_DB}\` CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci`,
  );
  await connection.end();

  const { default: knex } = await import('knex');
  const configModule = await import('../knexfile.js');
  const db = knex(configModule.default);
  await db.migrate.latest();
  await db.destroy();
}