// Immagini delle slide del Campus. Passano dal middleware come il resto di
// /campus, quindi non sono raggiungibili senza login con ruolo abilitato.
import type { APIRoute } from 'astro';
import { createReadStream, statSync } from 'node:fs';
import { extname } from 'node:path';
import { Readable } from 'node:stream';
import { resolveAsset } from '../../../lib/campus';

export const prerender = false;

const TYPES: Record<string, string> = {
  '.png': 'image/png', '.jpg': 'image/jpeg', '.jpeg': 'image/jpeg',
  '.webp': 'image/webp', '.gif': 'image/gif', '.svg': 'image/svg+xml',
};

export const GET: APIRoute = ({ params }) => {
  const rel = params.path;
  if (!rel) return new Response('Not found', { status: 404 });

  const type = TYPES[extname(rel).toLowerCase()];
  if (!type) return new Response('Tipo non consentito', { status: 400 });

  const file = resolveAsset(rel);
  if (!file) return new Response('Not found', { status: 404 });

  const { size } = statSync(file);
  const stream = Readable.toWeb(createReadStream(file)) as ReadableStream;
  return new Response(stream, {
    headers: {
      'Content-Type': type,
      'Content-Length': String(size),
      'Cache-Control': 'private, max-age=86400',
    },
  });
};