import { Hono } from 'hono';
import { GAMES_ROOT } from '../config.js';
import { resolveAsset } from './resolveAsset.js';

const app = new Hono();

/**
 * Fetch a PDF and stream it back inline so the browser renders it instead of
 * downloading. PDF hosts often send `Content-Disposition: attachment`, which
 * forces a download even when the URL is opened in a tab or iframe. This route
 * strips that header and forces `inline` so the PDF can be embedded in the web
 * app's viewer. Like `/asset`, a relative URL (no scheme) is treated as a game
 * asset path relative to `GAMES_ROOT`.
 */
app.get('/', async (c) => {
  const raw = c.req.query('url');
  if (!raw) {
    return c.json({ error: 'Missing url query param' }, 400);
  }

  const result = await resolveAsset(raw, GAMES_ROOT);
  if (!result.ok) {
    return c.json(
      { error: result.reason === 'not-found' ? 'Asset not found' : 'Invalid url query param' },
      result.reason === 'not-found' ? 404 : 400,
    );
  }
  const asset = result.asset;

  // A local game asset is streamed from disk; a remote one is fetched.
  let body: BodyInit;
  if (asset.stream) {
    body = asset.stream as unknown as BodyInit;
  } else {
    let res: Response;
    try {
      res = await fetch(asset.url!);
    } catch (err) {
      return c.json({ error: `Failed to fetch pdf: ${String(err)}` }, 502);
    }
    if (!res.ok) {
      return c.json({ error: `Pdf responded ${res.status}` }, 502);
    }
    body = res.body!;
  }

  return new Response(body, {
    headers: {
      'Content-Type': 'application/pdf',
      'Content-Disposition': 'inline',
      'Cache-Control': 'public, max-age=86400',
    },
  });
});

export default app;