import type { Pool } from 'pg';
import { createPool } from '../../src/db/pool.ts';
import { migrate } from '../../src/db/migrate.ts';

let pool: Pool | undefined;

export async function getTestPool(): Promise<Pool> {
  if (!pool) {
    pool = createPool(process.env.TEST_DATABASE_URL!);
    await migrate(pool);
  }
  return pool;
}

export async function resetDb(p: Pool): Promise<void> {
  const { rows } = await p.query<{ tablename: string }>(
    `SELECT tablename FROM pg_tables WHERE schemaname = 'public' AND tablename <> 'schema_migrations'`,
  );
  if (rows.length === 0) return;
  await p.query(`TRUNCATE ${rows.map((r) => `"${r.tablename}"`).join(', ')} RESTART IDENTITY CASCADE`);
}

export async function closeTestPool(): Promise<void> {
  await pool?.end();
  pool = undefined;
}