import 'zone.js/node';

import {APP_BASE_HREF} from '@angular/common';
import {CommonEngine} from '@angular/ssr';
import * as express from 'express';
import {existsSync} from 'node:fs';
import {join} from 'node:path';
import {AppServerModule} from './src/app/app.server.module';
import {REQUEST, RESPONSE} from "./src/app/openaireLibrary/utils/tokens";

// The Express app is exported so that it can be used by serverless Functions.
export function app(): express.Express {
  const server = express();
  const distFolder = join(process.cwd(), 'dist/monitor/browser');
  const indexHtml = existsSync(join(distFolder, 'index.original.html'))
      ? join(distFolder, 'index.original.html')
      : join(distFolder, 'index.html');

  const commonEngine = new CommonEngine();

  server.set('view engine', 'html');
  server.set('views', distFolder);

  // Example Express Rest API endpoints
  // server.get('/api/**', (req, res) => { });
  // Serve static files from /browser
  server.get('*.*', express.static(distFolder, {
    maxAge: '1y'
  }));

  // All regular routes use the Angular engine
  server.get('*', (req, res, next) => {
    const {protocol, originalUrl, baseUrl, headers} = req;

    commonEngine
        .render({
          inlineCriticalCss: false,
          bootstrap: AppServerModule,
          documentFilePath: indexHtml,
          url: `${protocol}://${headers.host}${originalUrl}`,
          publicPath: distFolder,
          providers: [
            {provide: APP_BASE_HREF, useValue: baseUrl},
            {provide: REQUEST, useValue: (req)},
            {provide: RESPONSE, useValue: (res)}
          ]
        })
        .then((html) => res.status(200).send(html))
        .catch((err) => res.status(500).send('Error during SSR'))
  });

  return server;
}

function run(): void {
  const port = process.env['PORT'] || 4000;

  // Start up the Node server
  const server = app();
  server.listen(port, () => {
    console.log(`Node Express server listening on http://localhost:${port}`);
  });
}

// Webpack will replace 'require' with '__webpack_require__'
// '__non_webpack_require__' is a proxy to Node 'require'
// The below code is to ensure that the server is run only when not requiring the bundle.
declare const __non_webpack_require__: NodeRequire;
const mainModule = __non_webpack_require__.main;
const moduleFilename = mainModule && mainModule.filename || '';
if (moduleFilename === __filename || moduleFilename.includes('iisnode')) {
  run();
}