import { BunyanLogger, rootLogger, configureExpress } from '@mondomob/gae-node-nestjs';
import * as debug from '@google-cloud/debug-agent';
import * as trace from '@google-cloud/trace-agent';
import { NestFactory } from '@nestjs/core';
import { ExpressAdapter } from '@nestjs/platform-express';
import * as express from 'express';
import { AppModule } from './app.module';
import { staticConfig } from './config/config.module';
import { getBuildInfo } from './util/buildVersionUtils';

if (process.env.APP_ENGINE_ENVIRONMENT) {
  trace.start();
  debug.start({
    allowExpressions: true,
  });
}

export async function bootstrap() {
  const expressApp = express();
  const buildTs = getBuildInfo()?.version;
  await configureExpress(expressApp, {
    session: staticConfig.session,
    sessionTimeoutInMinutes: staticConfig.sessionTimeoutInMinutes,
    staticAssets: {
      root: 'public',
      options: {
        index: false,
        setHeaders: (res, path) => {
          if (buildTs) {
            const etag = `W/"${buildTs}"`;
            const lastModified = new Date(buildTs).toUTCString();

            rootLogger.info(
              `Setting static resource etag: ${etag}, last-modified: ${lastModified} headers for path ${path}`,
            );

            res.setHeader('etag', etag);
            res.setHeader('last-modified', lastModified);
          }
        },
      },
    },
    csp: {
      directives: {
        defaultSrc: ["'none'"],
        scriptSrc: ["'self'"],
        styleSrc: ["'self'", "'unsafe-inline'", 'https://fonts.googleapis.com'],
        fontSrc: ["'self'", 'https://fonts.gstatic.com'],
        imgSrc: ["'self'", 'data: ', 'https://secure.gravatar.com/'],
        connectSrc: ["'self'", 'https://www.googleapis.com'],
        manifestSrc: ["'self'"],
      },
    },
  });

  rootLogger.info(`Configuring server`);
  const app = await NestFactory.create(AppModule, new ExpressAdapter(expressApp), {
    logger: new BunyanLogger(),
  });

  const stopListener = async () => {
    rootLogger.info('Killing process');

    await app.close();
    process.exit();
  };
  process.on('SIGINT', stopListener);

  const port = process.env.PORT || 8080;
  await app.listen(port);

  rootLogger.info(`Listening on port ${port}`);

  return {
    app,
    stop: async () => {
      process.removeListener('SIGINT', stopListener);
      await app.close();
    },
  };
}