import Link from "next/link";
import { getTranslations } from "next-intl/server";
import { Plus } from "lucide-react";
import { requireSession } from "@/server/auth";
import { dbForTenant } from "@/server/db";
import { hasPermission, requirePermission } from "@/server/rbac";
import { Button } from "@/components/ui/button";
import { CriticalityPill, PageHead, SectTitle, Tag } from "@/components/mockup-ui";
import {
  ProcessCreateModal,
  ProcessDetailModal,
  ProcessEditModal,
} from "@/components/process-modals";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";

const PROCESS_INCLUDE = {
  owner: { select: { name: true } },
  bia: true,
  processAssets: {
    include: {
      asset: {
        select: {
          id: true,
          name: true,
          type: true,
          confidentiality: true,
          integrity: true,
          availability: true,
          owner: { select: { name: true } },
        },
      },
    },
  },
} as const;

export default async function ProcessesPage({
  searchParams,
}: {
  searchParams: Promise<{ detail?: string; edit?: string; new?: string }>;
}) {
  const session = await requireSession();
  requirePermission(session, "bia:read");
  const t = await getTranslations("processes");
  const tAssets = await getTranslations("assets");
  const tCrit = await getTranslations("criticality");
  const tCat = await getTranslations("processCategory");
  const tc = await getTranslations("common");

  const params = await searchParams;
  const db = dbForTenant(session.user.tenantId);
  const canWrite = hasPermission(session, "bia:write");

  const processes = await db.process.findMany({
    include: {
      owner: { select: { name: true } },
      bia: { select: { criticality: true, rtoHours: true, rpoHours: true, mtdHours: true } },
    },
    orderBy: { name: "asc" },
    take: 200,
  });

  // Popup-Zustand aus searchParams: ?detail= (read-only), ?edit=, ?new=1
  const modalId = params.edit && canWrite ? params.edit : params.detail;
  const modalProcess = modalId
    ? await db.process.findUnique({ where: { id: modalId }, include: PROCESS_INCLUDE })
    : null;

  const users =
    canWrite && (params.edit || params.new)
      ? await db.user.findMany({
          where: { status: "ACTIVE" },
          select: { id: true, name: true },
          orderBy: { name: "asc" },
        })
      : [];
  // Zugeordnete Risiken: direkt am Prozess ODER an einem seiner Assets
  const modalRisks = modalProcess
    ? await db.risk.findMany({
        where: {
          OR: [
            { processId: modalProcess.id },
            { riskAssets: { some: { assetId: { in: modalProcess.processAssets.map((pa) => pa.assetId) } } } },
          ],
        },
        select: { id: true, refNo: true, title: true, score: true },
        orderBy: { score: "desc" },
      })
    : [];

  const availableAssets =
    canWrite && params.edit && modalProcess
      ? await db.asset.findMany({
          where: { id: { notIn: modalProcess.processAssets.map((pa) => pa.assetId) } },
          select: { id: true, name: true },
          orderBy: { name: "asc" },
        })
      : [];

  const hours = (v: number | null | undefined) => (v != null ? `${v} h` : tc("none"));

  return (
    <main className="flex-1 p-6">
      <PageHead
        crumb={tAssets("crumb")}
        title={t("biaTitle")}
        sub={t("biaSub")}
        actions={
          <>
            <Button variant="outline" disabled title={tc("comingSoon")}>
              {t("biaReport")}
            </Button>
            {canWrite && (
              <Button nativeButton={false} render={<Link href="/processes?new=1" />}>
                <Plus className="size-4" /> {t("newProcess")}
              </Button>
            )}
          </>
        }
      />


      <div className="shadow-card mt-4 rounded-xl border bg-card">
        <div className="p-4 pb-0">
          <SectTitle title={t("critTable")} />
        </div>
        <Table className="mt-2">
          <TableHeader>
            <TableRow>
              <TableHead>{t("process")}</TableHead>
              <TableHead>{t("category")}</TableHead>
              <TableHead>{t("owner")}</TableHead>
              <TableHead>RTO</TableHead>
              <TableHead>RPO</TableHead>
              <TableHead>MTD</TableHead>
              <TableHead>{t("criticality")}</TableHead>
            </TableRow>
          </TableHeader>
          <TableBody>
            {processes.length === 0 && (
              <TableRow>
                <TableCell colSpan={7} className="py-8 text-center text-muted-foreground">
                  {t("empty")}
                </TableCell>
              </TableRow>
            )}
            {processes.map((process) => (
              <TableRow key={process.id}>
                <TableCell>
                  <Link href={`/processes?detail=${process.id}`} className="font-bold hover:underline">
                    {process.name}
                  </Link>
                </TableCell>
                <TableCell>
                  <Tag>{tCat(process.category)}</Tag>
                </TableCell>
                <TableCell className="text-muted-foreground">
                  {process.owner?.name ?? tc("none")}
                </TableCell>
                <TableCell>{hours(process.bia?.rtoHours)}</TableCell>
                <TableCell>{hours(process.bia?.rpoHours)}</TableCell>
                <TableCell>{hours(process.bia?.mtdHours)}</TableCell>
                <TableCell>
                  {process.bia ? (
                    <CriticalityPill
                      level={process.bia.criticality}
                      label={tCrit(String(process.bia.criticality))}
                    />
                  ) : (
                    <span className="text-muted-foreground">{t("noBia")}</span>
                  )}
                </TableCell>
              </TableRow>
            ))}
          </TableBody>
        </Table>
      </div>

      {modalProcess && params.edit && canWrite ? (
        <ProcessEditModal process={modalProcess} users={users} availableAssets={availableAssets} />
      ) : modalProcess ? (
        <ProcessDetailModal process={modalProcess} risks={modalRisks} canWrite={canWrite} />
      ) : params.new && canWrite ? (
        <ProcessCreateModal users={users} />
      ) : null}
    </main>
  );
}