import Link from "next/link";
import { redirect } from "next/navigation";
import { getTranslations } from "next-intl/server";
import { Plus, Search } from "lucide-react";
import type { AssetType } from "@prisma/client";
import { requireSession } from "@/server/auth";
import { dbForTenant } from "@/server/db";
import { hasPermission, requirePermission } from "@/server/rbac";
import { Button } from "@/components/ui/button";
import { FilterTabs } from "@/components/filter-tabs";
import {
  CiaBadge,
  CiaLegend,
  KpiCard,
  OwnerChip,
  PageHead,
  Pill,
  Tag,
} from "@/components/mockup-ui";
import {
  AssetCreateModal,
  AssetDetailModal,
  AssetEditModal,
} from "@/components/asset-modals";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";

const ASSET_TYPES = ["INFORMATION", "SYSTEM", "APPLICATION", "LOCATION", "SUPPLIER", "IT_SERVICE", "PERSON", "DATA"] as const;

const STATUS_TONE = { ACTIVE: "ok", PLANNED: "info", RETIRED: "mut" } as const;

/**
 * Lieferanten- und IT-Service-Assets werden in ihrem Fach-Cockpit geöffnet
 * (sofern ein Fachprofil existiert), alle übrigen Assets in der normalen
 * Asset-Detailansicht.
 */
function assetDetailHref(asset: {
  id: string;
  type: AssetType;
  supplierProfile: { id: string } | null;
  serviceProfile: { id: string } | null;
}) {
  if (asset.type === "SUPPLIER" && asset.supplierProfile) return `/suppliers?detail=${asset.id}`;
  if (asset.type === "IT_SERVICE" && asset.serviceProfile) return `/suppliers?tab=services&detail=${asset.id}`;
  return `/assets?detail=${asset.id}`;
}

export default async function AssetsPage({
  searchParams,
}: {
  searchParams: Promise<{ q?: string; type?: string; detail?: string; edit?: string; new?: string }>;
}) {
  const session = await requireSession();
  requirePermission(session, "asset:read");
  const t = await getTranslations("assets");
  const tType = await getTranslations("assetType");
  const tStatus = await getTranslations("assetStatus");
  const tc = await getTranslations("common");

  const params = await searchParams;
  const { q, type } = params;
  const activeType = ASSET_TYPES.includes(type as AssetType) ? (type as AssetType) : null;
  const db = dbForTenant(session.user.tenantId);

  const [assets, allAssets] = await Promise.all([
    db.asset.findMany({
      where: {
        ...(q ? { name: { contains: q, mode: "insensitive" } } : {}),
        ...(activeType ? { type: activeType } : {}),
      },
      include: {
        owner: { select: { name: true } },
        supplierProfile: { select: { id: true } },
        serviceProfile: { select: { id: true } },
        relationsFrom: {
          include: { relatedAsset: { select: { name: true } } },
          take: 4,
        },
      },
      orderBy: { name: "asc" },
      take: 200,
    }),
    db.asset.findMany({
      select: { type: true, ownerId: true, confidentiality: true, integrity: true, availability: true },
    }),
  ]);

  const total = allAssets.length;
  const typeCount = new Set(allAssets.map((a) => a.type)).size;
  const highProtection = allAssets.filter(
    (a) => Math.max(a.confidentiality, a.integrity, a.availability) >= 3
  ).length;
  const withoutOwner = allAssets.filter((a) => !a.ownerId).length;
  const suppliers = allAssets.filter((a) => a.type === "SUPPLIER").length;

  const canWrite = hasPermission(session, "asset:write");

  // Popup-Zustand aus searchParams: ?detail= (read-only), ?edit=, ?new=1
  const modalId = params.edit && canWrite ? params.edit : params.detail;
  const modalAsset = modalId
    ? await db.asset.findUnique({
        where: { id: modalId },
        include: {
          owner: { select: { name: true } },
          supplierProfile: { select: { id: true } },
          serviceProfile: { select: { id: true } },
          relationsFrom: {
            include: {
              relatedAsset: {
                select: {
                  id: true,
                  name: true,
                  type: true,
                  confidentiality: true,
                  integrity: true,
                  availability: true,
                },
              },
            },
          },
          relationsTo: { include: { asset: { select: { id: true, name: true } } } },
          processAssets: { include: { process: { select: { id: true, name: true } } } },
          riskAssets: {
            include: { risk: { select: { id: true, refNo: true, title: true, score: true } } },
            orderBy: { risk: { score: "desc" } },
          },
        },
      })
    : null;

  // Lieferanten/IT-Services im Fach-Cockpit öffnen, auch bei direktem Aufruf
  // (nur wenn ein Fachprofil existiert; profillose Alt-Assets bleiben im Asset-Detail)
  if (modalAsset && ((modalAsset.type === "SUPPLIER" && modalAsset.supplierProfile) || (modalAsset.type === "IT_SERVICE" && modalAsset.serviceProfile))) {
    const base = modalAsset.type === "IT_SERVICE" ? "/suppliers?tab=services" : "/suppliers";
    redirect(`${base}${base.includes("?") ? "&" : "?"}${params.edit && canWrite ? "edit" : "detail"}=${modalAsset.id}`);
  }

  const users =
    canWrite && (params.edit || params.new)
      ? await db.user.findMany({
          where: { status: "ACTIVE" },
          select: { id: true, name: true },
          orderBy: { name: "asc" },
        })
      : [];
  const otherAssets =
    canWrite && params.edit && modalAsset
      ? await db.asset.findMany({
          where: { id: { not: modalAsset.id } },
          select: { id: true, name: true },
          orderBy: { name: "asc" },
        })
      : [];

  const typeHref = (v: string | null) =>
    `/assets${v ? `?type=${v}` : ""}${q ? `${v ? "&" : "?"}q=${encodeURIComponent(q)}` : ""}`;

  return (
    <main className="flex-1 p-6">
      <PageHead
        crumb={t("crumb")}
        title={t("invTitle")}
        sub={t("invSub", { count: total })}
        actions={
          <>
            <Button variant="outline" disabled title={tc("comingSoon")}>
              {t("excelImport")}
            </Button>
            <Button variant="outline" disabled title={tc("comingSoon")}>
              {t("export")}
            </Button>
            {canWrite && (
              <Button nativeButton={false} render={<Link href="/assets?new=1" />}>
                <Plus className="size-4" /> {t("newAsset")}
              </Button>
            )}
          </>
        }
      />


      <div className="mt-4 grid gap-4 sm:grid-cols-2 xl:grid-cols-4">
        <KpiCard label={t("kpiTotal")} value={total} trend={t("kpiTotalTrend", { count: typeCount })} />
        <KpiCard label={t("kpiHigh")} value={highProtection} trend={t("kpiHighTrend")} trendColor="risk" />
        <KpiCard
          label={t("kpiNoOwner")}
          value={withoutOwner}
          trend={withoutOwner > 0 ? t("kpiNoOwnerTrend") : undefined}
          trendColor="warn"
        />
        <KpiCard label={t("kpiSuppliers")} value={suppliers} trend={t("kpiSuppliersTrend")} />
      </div>

      <div className="shadow-card mt-4 rounded-xl border bg-card">
        <div className="flex flex-wrap items-center justify-between gap-3 p-4">
          <FilterTabs
            tabs={[
              { href: typeHref(null), label: t("all"), active: !activeType },
              ...ASSET_TYPES.map((v) => ({
                href: typeHref(v),
                label: tType(v),
                active: activeType === v,
              })),
            ]}
          />
          <form method="GET" className="flex max-w-65 items-center gap-2 rounded-lg border bg-muted px-3 py-2 text-muted-foreground">
            {activeType && <input type="hidden" name="type" value={activeType} />}
            <Search className="size-[15px] shrink-0" />
            <input
              name="q"
              defaultValue={q}
              placeholder={t("filter")}
              className="w-full border-0 bg-transparent text-[13px] text-foreground outline-none"
            />
          </form>
        </div>
        <Table>
          <TableHeader>
            <TableRow>
              <TableHead>Asset</TableHead>
              <TableHead>{t("type")}</TableHead>
              <TableHead>{t("owner")}</TableHead>
              <TableHead>
                <span className="flex flex-col gap-1">
                  {t("protection")}
                  <CiaLegend />
                </span>
              </TableHead>
              <TableHead>{t("dependencies")}</TableHead>
              <TableHead>{t("status")}</TableHead>
            </TableRow>
          </TableHeader>
          <TableBody>
            {assets.length === 0 && (
              <TableRow>
                <TableCell colSpan={6} className="py-8 text-center text-muted-foreground">
                  {t("empty")}
                </TableCell>
              </TableRow>
            )}
            {assets.map((asset) => (
              <TableRow key={asset.id}>
                <TableCell>
                  <Link href={assetDetailHref(asset)} className="font-bold hover:underline">
                    {asset.name}
                  </Link>
                </TableCell>
                <TableCell>
                  <Tag>{tType(asset.type)}</Tag>
                </TableCell>
                <TableCell>
                  <OwnerChip name={asset.owner?.name} noOwnerLabel={t("noOwner")} />
                </TableCell>
                <TableCell>
                  <CiaBadge c={asset.confidentiality} i={asset.integrity} a={asset.availability} />
                </TableCell>
                <TableCell className="text-muted-foreground">
                  {asset.relationsFrom.length
                    ? asset.relationsFrom.map((r) => r.relatedAsset.name).join(", ")
                    : tc("none")}
                </TableCell>
                <TableCell>
                  <Pill tone={STATUS_TONE[asset.status]}>{tStatus(asset.status)}</Pill>
                </TableCell>
              </TableRow>
            ))}
          </TableBody>
        </Table>
      </div>

      {modalAsset && params.edit && canWrite ? (
        <AssetEditModal asset={modalAsset} users={users} otherAssets={otherAssets} />
      ) : modalAsset ? (
        <AssetDetailModal asset={modalAsset} canWrite={canWrite} />
      ) : params.new && canWrite ? (
        <AssetCreateModal users={users} />
      ) : null}
    </main>
  );
}