import crypto from 'crypto';
import { NextResponse } from 'next/server';

function generateETag() {
  return crypto.randomBytes(10).toString('hex');
}

function getETag(){
	return ETag
}

let ETag = generateETag();

export async function GET(request: Request) {
  const clientETagInHeader = request.headers.get('If-None-Match')?.trim?.() || '';
  const responseOptions: ResponseInit = {};

	if (ETag && clientETagInHeader) {
	  let serverETag = ETag;
	  const executed = /^([wW]\/)?"?([^"]+)"?$/.exec(clientETagInHeader);
	
	  if (executed) {
	    let [, isWeak, clientETag] = executed;

	    if (isWeak) {
	      serverETag = serverETag.toLowerCase();
	      clientETag = clientETag.toLowerCase();
	    }
	    if (clientETag === serverETag) {
	      return new Response(null, {
	        status: 304
	      });
	    }
	  }
	}

  const videoList = await getVideoList();

  return NextResponse.json(videoList, {
    'Cache-Control': 'public, max-age=0, must-revalidate',
    ETag: `"${lastModified.ETag}"`
  });
}