import { fail, ok, parseBigIntId, requireSession } from "@/lib/api";
import { runWithMailCcOwner } from "@/lib/cc-owner";
import { evaluateTransferGate } from "@/services/cc/container-status";
import { prisma } from "@/services/db";
import { assertMailReadable } from "@/services/tenant/access";

type RouteContext = { params: Promise<{ id: string }> };

export async function GET(_req: Request, ctx: RouteContext) {
  const guard = await requireSession();
  if (guard.response) return guard.response;

  const { id } = await ctx.params;
  const mailId = parseBigIntId(id);
  if (!mailId) return fail("VALIDATION", "Invalid mail id", 400);

  const mail = await prisma.mailMessage.findUnique({
    where: { id: mailId },
    include: { parseResult: true },
  });
  if (!mail) return fail("NOT_FOUND", "邮件不存在", 404);
  if (!(await assertMailReadable(guard.session, mailId))) {
    return fail("NOT_FOUND", "邮件不存在", 404);
  }

  const header = mail.parseResult?.containerHeader as
    | { F_ContainerNo?: string }
    | undefined;
  const cn = (header?.F_ContainerNo || "").trim();
  const gate = await runWithMailCcOwner(mailId, () => evaluateTransferGate(cn));
  return ok({ container_no: cn, gate });
}