import { projectRef } from "@/lib/projects";
import { EXPORT_FORMATS, exportProject } from "@/lib/report/export.mjs";

export const dynamic = "force-dynamic";

// GET ?project=<id>&format=toc-bbcode|toc-markdown|description|chapters[&variant=]
// Plain text, so CopyButton can fetch it straight onto the clipboard.
export async function GET(request: Request) {
  const url = new URL(request.url);
  const project = await projectRef(url.searchParams.get("project") ?? "");
  if (!project) return new Response("no such project", { status: 404 });
  const format = url.searchParams.get("format") ?? "";
  if (!EXPORT_FORMATS.includes(format)) {
    return new Response(`format must be one of ${EXPORT_FORMATS.join(", ")}`, { status: 400 });
  }
  const variant = url.searchParams.get("variant") || undefined;
  try {
    const r = await exportProject(project.dir, format, variant ? { variant } : {});
    return new Response(r.text, {
      headers: {
        "content-type": "text/plain; charset=utf-8",
        "cache-control": "no-store",
        "x-offsets": r.offsets.source,
      },
    });
  } catch (e) {
    return new Response(e instanceof Error ? e.message : String(e), { status: 409 });
  }
}