'use strict';

const { Pool } = require('pg');

module.exports = function imageAssetsDbService(app, conf) {
   app.fs = app.fs || {};
   let pool = null;

   function getPool() {
      const connectionString = conf.imageAssets?.databaseUrl;
      if (!connectionString) {
         throw new Error('未配置 IMAGE_ASSETS_DATABASE_URL');
      }
      if (!pool) {
         pool = new Pool({ connectionString });
      }
      return pool;
   }

   app.fs.imageAssetsDb = {
      query: (...args) => getPool().query(...args),
      close: async () => {
         if (pool) await pool.end();
      },
   };
};