import { readFileSync, existsSync } from 'node:fs';
import { resolve, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';
import { parse } from 'dotenv';

const root = dirname(fileURLToPath(import.meta.url));
process.chdir(root);

if (existsSync(resolve('static'))) {
  throw new Error('Standalone must run in an isolated directory without a legacy static/ folder');
}

const buildIdFile = resolve(".next", 'BUILD_ID');
if (!existsSync(buildIdFile)) {
  throw new Error(
    '缺少 ' + ".next" + '/BUILD_ID。请使用打包产物并用 node start.mjs 启动，不要使用 next start。',
  );
}

const environment = "production";
const read = (file) => (existsSync(file) ? parse(readFileSync(file)) : {});
const config = {
  ...read(resolve('config', environment + '.env')),
  ...read(resolve('config', environment + '.local.env')),
  ...process.env,
  APP_ENV: environment,
  NODE_ENV: 'production',
};
const api = (config.API_PROXY_TARGET || config.NEXT_PUBLIC_API_BASE_URL || '').trim();
if (!api) throw new Error('API_PROXY_TARGET 或 NEXT_PUBLIC_API_BASE_URL 必填');
Object.assign(process.env, config);

// standalone 入口（不是 next start）
await import('./server.js');