// Postgres connection pool. Created lazily on first use so the module can be
// imported during build/analysis without DATABASE_URL being present.
import pg from 'pg';
import { env } from '$env/dynamic/private';

let pool: pg.Pool | null = null;

function getPool(): pg.Pool {
	if (pool) return pool;
	const connectionString = env.DATABASE_URL;
	if (!connectionString) {
		// Fail loudly on first query rather than mysteriously later.
		throw new Error(
			'DATABASE_URL is not set. Copy .env.example to .env (or set it in docker-compose) and try again.'
		);
	}
	pool = new pg.Pool({ connectionString });
	return pool;
}

/** Small helper so call sites read as `query(sql, params)`. */
export function query<T extends pg.QueryResultRow = pg.QueryResultRow>(
	text: string,
	params?: unknown[]
): Promise<pg.QueryResult<T>> {
	return getPool().query<T>(text, params);
}