// Oracle Autonomous DB 접속 (node-oracledb thick 모드).
// Instant Client + sso 지갑(cwallet.sso)을 사용하므로 지갑 비밀번호가 필요 없다.
// (백엔드 JDBC 와 동일하게 자동로그인 지갑을 재사용)
import oracledb from 'oracledb';
import { config } from './config.js';
import { log } from './logger.js';

oracledb.fetchAsString = [oracledb.CLOB];
oracledb.autoCommit = false;

let pool = null;
let clientInitialized = false;

function initClient() {
  if (clientInitialized) return;
  oracledb.initOracleClient({
    libDir: config.oracle.icLibDir,
    configDir: config.oracle.netConfigDir, // tnsnames.ora + WALLET_LOCATION 보정 sqlnet.ora
  });
  clientInitialized = true;
}

export async function initPool() {
  if (pool) return pool;
  initClient();
  pool = await oracledb.createPool({
    user: config.oracle.user,
    password: config.oracle.password,
    connectString: config.oracle.connectString,
    poolMin: 1,
    poolMax: 4,
    poolIncrement: 1,
  });
  log.info('Oracle 풀 생성 완료');
  return pool;
}

export async function withConnection(fn) {
  if (!pool) await initPool();
  const conn = await pool.getConnection();
  try {
    return await fn(conn);
  } finally {
    try {
      await conn.close();
    } catch (e) {
      log.warn('연결 반환 실패:', e.message);
    }
  }
}

export async function closePool() {
  if (pool) {
    await pool.close(10);
    pool = null;
    log.info('Oracle 풀 종료');
  }
}

export { oracledb };