import { NextResponse } from 'next/server';
import { readFileSync, existsSync } from 'node:fs';
import { join } from 'node:path';

const CONTENT_DIR = join(process.cwd(), 'content');

const MIME_TYPES: Record<string, string> = {
  '.jpg': 'image/jpeg',
  '.jpeg': 'image/jpeg',
  '.png': 'image/png',
  '.gif': 'image/gif',
  '.webp': 'image/webp',
  '.svg': 'image/svg+xml',
  '.pdf': 'application/pdf',
  '.txt': 'text/plain',
  '.md': 'text/plain',
  '.mdx': 'text/plain',
};

export async function GET(
  _request: Request,
  { params }: { params: Promise<{ path: string[] }> },
) {
  const { path } = await params;
  const decodedPath = decodeURIComponent(path.join('/'));
  const fullPath = join(CONTENT_DIR, decodedPath);

  if (!fullPath.startsWith(CONTENT_DIR) || !existsSync(fullPath)) {
    return new NextResponse('Not found', { status: 404 });
  }

  const ext = '.' + fullPath.split('.').pop()!;
  const contentType = MIME_TYPES[ext] ?? 'application/octet-stream';
  const data = readFileSync(fullPath);

  return new NextResponse(data, {
    headers: {
      'Content-Type': contentType,
      'Cache-Control': 'public, max-age=31536000, immutable',
    },
  });
}