import { drizzle } from 'drizzle-orm/node-postgres';
import { Pool } from 'pg';

function requiredConnectionString(connectionString) {
  if (typeof connectionString !== 'string' || connectionString.length === 0) {
    throw new Error('DATABASE_URL is required.');
  }

  return connectionString;
}

export function createDatabase(connectionString = process.env.DATABASE_URL) {
  const pool = new Pool({ connectionString: requiredConnectionString(connectionString) });

  return {
    db: drizzle({ client: pool }),
    close: () => pool.end(),
  };
}