export const runtime = "nodejs";

import { NextResponse } from "next/server";
import { getCustomerByPortalToken, appendCustomerReply } from "@/lib/tickets/service";
import { saveAttachment, AttachmentTooLargeError, MAX_ATTACHMENT_BYTES } from "@/lib/attachments/storage";

export async function POST(
  request: Request,
  { params }: { params: Promise<{ ticketId: string }> },
) {
  const { ticketId } = await params;
  const formData = await request.formData().catch(() => null);

  const token = formData?.get("token");
  if (typeof token !== "string" || !token) {
    return NextResponse.json({ error: "Missing token" }, { status: 400 });
  }

  const file = formData?.get("file");
  if (!(file instanceof File)) {
    return NextResponse.json({ error: "Missing file" }, { status: 400 });
  }
  if (file.size > MAX_ATTACHMENT_BYTES) {
    return NextResponse.json({ error: "File too large" }, { status: 413 });
  }

  const customer = await getCustomerByPortalToken(token);
  if (!customer) {
    return NextResponse.json({ error: "Invalid token" }, { status: 404 });
  }

  const captionRaw = formData?.get("caption");
  const caption = typeof captionRaw === "string" ? captionRaw.trim() : "";

  const buffer = Buffer.from(await file.arrayBuffer());
  let saved;
  try {
    saved = await saveAttachment(buffer);
  } catch (err) {
    if (err instanceof AttachmentTooLargeError) {
      return NextResponse.json({ error: "File too large" }, { status: 413 });
    }
    throw err;
  }

  try {
    const result = await appendCustomerReply({
      ticketId,
      customerId: customer.id,
      authorName: customer.displayName,
      body: caption || file.name || "Вложение",
      attachments: [
        {
          filename: file.name || "file",
          mimeType: file.type || "application/octet-stream",
          sizeBytes: saved.sizeBytes,
          storageKey: saved.storageKey,
        },
      ],
    });
    return NextResponse.json(result, { status: 201 });
  } catch {
    return NextResponse.json({ error: "Ticket not found" }, { status: 404 });
  }
}