export const dynamic = 'force-static';

import fs from 'fs';
import path from 'path';

export async function GET(
  request: Request,
  { params }: { params: Promise<{ path: string[] }> }
) {
  const { path: pathParts } = await params;
  const fileName = pathParts.join('/');
  const filePath = path.join(process.cwd(), 'assets', 'big-models', fileName);

  if (!fs.existsSync(filePath)) {
    return new Response('Not Found', { status: 404 });
  }

  const stat = fs.statSync(filePath);
  const stream = fs.createReadStream(filePath);
 
  const ext = path.extname(fileName).toLowerCase();
  let contentType = 'application/octet-stream';
  if (ext === '.glb') contentType = 'model/gltf-binary';
  else if (ext === '.gltf') contentType = 'model/gltf+json';
  else if (ext === '.bin') contentType = 'application/octet-stream';
  else if (ext === '.png') contentType = 'image/png';
  else if (ext === '.jpg' || ext === '.jpeg') contentType = 'image/jpeg';
  else if (ext === '.webp') contentType = 'image/webp';
  else if (ext === '.ktx2') contentType = 'image/ktx2';

  return new Response(stream as unknown as ReadableStream, {
    headers: {
      'Content-Length': stat.size.toString(),
      'Content-Type': contentType,
    },
  });
}