import { Router, Request, Response } from 'express';
import { requireAuth } from '../../auth-connector/source/server/auth';
import https from 'https';

const REMOTE_HOST = 'roject.rokojori.com';

const router = Router();
router.use( requireAuth );

router.all( '*', ( req: Request, res: Response ) => {
  const remotePath = '/api' + req.path;
  const qs = req.url.slice( req.path.length );

  const token = ( req.headers.authorization as string ) ?? '';

  let bodyBuffer: Buffer | undefined;
  if ( req.body !== undefined && ( req.method === 'POST' || req.method === 'PUT' ) ) {
    bodyBuffer = typeof req.body === 'string'
      ? Buffer.from( req.body, 'utf8' )
      : Buffer.from( JSON.stringify( req.body ), 'utf8' );
  }

  const reqHeaders: Record<string, string | number> = { 'Authorization': token };
  const ct = req.headers[ 'content-type' ];
  if ( ct ) reqHeaders[ 'Content-Type' ] = ct;
  if ( bodyBuffer ) reqHeaders[ 'Content-Length' ] = bodyBuffer.length;

  const proxyReq = https.request(
    { hostname: REMOTE_HOST, path: remotePath + qs, method: req.method, headers: reqHeaders },
    ( proxyRes ) => {
      res.status( proxyRes.statusCode ?? 200 );
      const resCt = proxyRes.headers[ 'content-type' ];
      if ( resCt ) res.setHeader( 'Content-Type', resCt );
      proxyRes.pipe( res );
    }
  );

  proxyReq.on( 'error', ( err ) => {
    res.status( 502 ).json( { error: 'Remote server unreachable', detail: err.message } );
  } );

  if ( bodyBuffer ) proxyReq.write( bodyBuffer );
  proxyReq.end();
} );

export default router;