import { NextRequest, NextResponse } from 'next/server';
import { marked } from 'marked';

const GITEA_URL = process.env.GITEA_URL;
const GITEA_USERNAME = process.env.GITEA_USERNAME;

if (!GITEA_URL || !GITEA_USERNAME) {
  throw new Error('GITEA_URL and GITEA_USERNAME must be set in env');
}

export async function GET(req: NextRequest) {
  const repo = req.nextUrl.searchParams.get('repo');
  if (!repo) {
    return new NextResponse('Missing repo', { status: 400 });
  }

  // raw README (default branch)
  const readmeUrl = `${GITEA_URL}/api/v1/repos/${GITEA_USERNAME}/${encodeURIComponent(
    repo,
  )}/raw/README.md`;

  const res = await fetch(readmeUrl, {
    headers: { Accept: 'text/plain' },
    cache: 'no-store',
  });

  if (!res.ok) {
    return new NextResponse(
      `Failed to fetch README: HTTP ${res.status}`,
      { status: 502 },
    );
  }

  const md = await res.text();

  // marked.parse can return string | Promise<string>,
  // so we call it in async mode and await the result.
  const html = await marked.parse(md || '', { async: true });

  return new NextResponse(html, {
    status: 200,
    headers: {
      'Content-Type': 'text/html; charset=utf-8',
    },
  });
}