import { auth } from "@/auth";
import { db } from "@/lib/db";
import { notFound, redirect } from "next/navigation";
import { EditPoForm } from "./edit-po-form";
import type { CostCentreOption } from "@/app/(portal)/po/new/new-po-form";
import type { Metadata } from "next";

interface Props {
  params: Promise<{ id: string }>;
}

export const metadata: Metadata = { title: "Edit Purchase Order" };

export default async function EditPoPage({ params }: Props) {
  const session = await auth();
  if (!session?.user) redirect("/login");

  const { id } = await params;

  const po = await db.purchaseOrder.findUnique({
    where: { id },
    include: { lineItems: { orderBy: { sortOrder: "asc" } } },
  });

  if (!po) notFound();

  if (!["DRAFT", "EDITS_REQUESTED"].includes(po.status)) redirect(`/po/${id}`);

  const canEdit =
    po.submitterId === session.user.id || session.user.role === "SUPERUSER";
  if (!canEdit) redirect(`/po/${id}`);

  const [vessels, sites, accounts, vendors, noteAction] = await Promise.all([
    db.vessel.findMany({ where: { isActive: true }, orderBy: { name: "asc" }, select: { id: true, name: true, code: true } }),
    db.site.findMany({ where: { isActive: true }, orderBy: { name: "asc" }, select: { id: true, name: true, code: true } }),
    db.account.findMany({ where: { isActive: true }, orderBy: { name: "asc" } }),
    db.vendor.findMany({ where: { isActive: true }, orderBy: { name: "asc" } }),
    po.status === "EDITS_REQUESTED"
      ? db.pOAction.findFirst({
          where: { poId: po.id, actionType: "EDITS_REQUESTED", note: { not: null } },
          orderBy: { createdAt: "desc" },
          include: { actor: { select: { name: true } } },
        })
      : Promise.resolve(null),
  ]);

  const costCentres: CostCentreOption[] = [
    ...vessels.map((v) => ({ ref: `v:${v.id}`, label: `${v.code} — ${v.name}`, group: "Vessels" as const })),
    ...sites.map((s) => ({ ref: `s:${s.id}`, label: `${s.code} — ${s.name}`, group: "Sites" as const })),
  ];
  const initialCostCentreRef = po.vesselId ? `v:${po.vesselId}` : po.siteId ? `s:${po.siteId}` : "";

  const serializedPo = {
    ...po,
    totalAmount: po.totalAmount.toNumber(),
    lineItems: po.lineItems.map((li) => ({
      ...li,
      quantity: li.quantity.toNumber(),
      unitPrice: li.unitPrice.toNumber(),
      totalPrice: li.totalPrice.toNumber(),
      gstRate: li.gstRate.toNumber(),
    })),
  };

  return (
    <div className="max-w-6xl">
      <div className="mb-6">
        <h1 className="text-2xl font-semibold text-neutral-900">Edit Purchase Order</h1>
        <p className="mt-1 text-sm text-neutral-500 font-mono">{po.poNumber}</p>
      </div>
      <EditPoForm po={serializedPo} costCentres={costCentres} initialCostCentreRef={initialCostCentreRef} accounts={accounts} vendors={vendors} managerNoteAuthor={noteAction?.actor.name ?? null} />
    </div>
  );
}