import { serverAuth } from "@/lib/pb";
import { revalidateInvoicePages } from "@/lib/invoice-revalidate";
import { canReplaceRetrySource, intakeRetryHeaders } from "@/lib/intake-retry";

export const dynamic = "force-dynamic";

// POST /api/invoices/intake/:id/retry
// Re-attempts the import for a problem invoice.
//
// Retry is only meaningful once the REASON is addressed, so this never silently
// re-parses a broken PDF and calls it fixed: it re-reads the stored document and, if
// the parse still fails, updates the recorded reason instead of pretending it worked.
// Once it succeeds the inbox row is marked imported and linked to the new invoice.
export async function POST(
  _req: Request,
  { params }: { params: Promise<{ id: string }> },
) {
  const { id } = await params;
  const pb = await serverAuth();

  try {
    const record = await pb.collection("invoice_intake").getOne(id);
    if (!record.source_pdf) {
      return Response.json({ ok: false, error: "The original document is no longer stored" }, { status: 400 });
    }

    // Pull the stored bytes back down. A bare /api/files/<name> 404s for a
    // rule-locked collection even with an admin token — protected files resolve by
    // the full /collectionId/recordId/filename path, which the SDK builds for us.
    const token = record.source_pdf as string;
    const url = pb.files.getURL(record, token);
    const res = await fetch(url, {
      headers: pb.authStore.token ? { Authorization: pb.authStore.token } : undefined,
    });
    if (!res.ok) {
      const reason = `Could not read the stored document back from storage (HTTP ${res.status})`;
      await pb.collection("invoice_intake").update(id, { status: "failed", error: reason });
      return Response.json({ ok: false, error: reason }, { status: 502 });
    }

    const file = new File([await res.arrayBuffer()], record.file_name || token, {
      type: "application/pdf",
    });
    const fd = new FormData();
    fd.append("file", file);

    // Re-run the full intake against the same bytes.
    const intake = await fetch(new URL("/api/invoices/intake", _req.url), {
      method: "POST",
      headers: intakeRetryHeaders(_req),
      body: fd,
      redirect: "error",
    });
    const result = await intake.json().catch(() => ({ ok: false, error: "Unexpected response" }));

    // Only discard this document once an import or a replacement inbox record
    // exists. Auth/outage/duplicate failures must keep the original available.
    if (!canReplaceRetrySource(intake.status, result)) {
      return Response.json({ ok: false, error: result.error || "Could not retry this invoice. The original document has been kept." },
        { status: intake.ok ? 502 : intake.status });
    }

    if (result.ok) {
      await pb.collection("invoice_intake").delete(id);
      revalidateInvoicePages("/income");
      return Response.json({ ok: true, retried: true, ...result });
    }

    // Still failing — keep it in the inbox with the newest reason, and drop the
    // duplicate record the retry just created so the inbox stays one row per file.
    await pb.collection("invoice_intake").delete(id).catch(() => {});
    revalidateInvoicePages();
    return Response.json(
      { ok: false, retried: true, stillFailing: true, error: result.error ?? "Import failed again" },
      { status: 422 },
    );
  } catch (e: any) {
    return Response.json({ ok: false, error: e?.message || "Retry failed" }, { status: 500 });
  }
}