import Link from "next/link";
import { getTranslations } from "next-intl/server";
import { Plus } from "lucide-react";
import type { Prisma } 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 { PageHead, Pill, SectTitle, Tag } from "@/components/mockup-ui";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";
import {
  INCIDENT_INCLUDE,
  IncidentCreateModal,
  IncidentDetailModal,
  IncidentEditModal,
} from "@/components/incident-modals";
import {
  INCIDENT_CATEGORIES,
  INCIDENT_STATUSES,
  SEVERITY_TONE,
  STATUS_TONE,
  canSeeRestricted,
  type IncidentStatus,
} from "@/lib/incident";
import { INCIDENT_SEVERITIES, type IncidentSeverity } from "@/lib/incident-severity";

export default async function IncidentsPage({
  searchParams,
}: {
  searchParams: Promise<{
    detail?: string;
    edit?: string;
    new?: string;
    status?: string;
    severity?: string;
    category?: string;
  }>;
}) {
  const session = await requireSession();
  requirePermission(session, "incident:read");
  const t = await getTranslations("incidents");
  const tCat = await getTranslations("incidentCategory");
  const tStatus = await getTranslations("incidentStatus");
  const tSev = await getTranslations("incidentSeverity");

  const params = await searchParams;
  const db = dbForTenant(session.user.tenantId);
  const canManage = hasPermission(session, "incident:manage");
  const canClose = hasPermission(session, "incident:close");
  const canReport = hasPermission(session, "incident:report");

  // §11 Vertraulichkeit: wer nicht manage/close hat, sieht nur unrestricted +
  // seine eigenen (owner) Vorfälle — serverseitiger Filter.
  const restrictedWhere: Prisma.IncidentWhereInput = canSeeRestricted(session)
    ? {}
    : { OR: [{ restricted: false }, { ownerId: session.user.id }] };

  const filterWhere: Prisma.IncidentWhereInput = {
    ...(params.status && INCIDENT_STATUSES.includes(params.status as IncidentStatus)
      ? { status: params.status as IncidentStatus }
      : {}),
    ...(params.severity && INCIDENT_SEVERITIES.includes(params.severity as IncidentSeverity)
      ? { severity: params.severity }
      : {}),
    ...(params.category &&
    INCIDENT_CATEGORIES.includes(params.category as (typeof INCIDENT_CATEGORIES)[number])
      ? { category: params.category as (typeof INCIDENT_CATEGORIES)[number] }
      : {}),
  };

  const incidents = await db.incident.findMany({
    where: { AND: [restrictedWhere, filterWhere] },
    include: { owner: { select: { name: true } } },
    orderBy: { createdAt: "desc" },
    take: 200,
  });

  // Detail/Bearbeiten-Popup
  const modalId = params.edit && canManage ? params.edit : params.detail;
  const modalIncident = modalId
    ? await db.incident.findFirst({
        where: { AND: [{ id: modalId }, restrictedWhere] },
        include: INCIDENT_INCLUDE,
      })
    : null;

  // Für die Detail-Timeline: Audit-Einträge dieses Vorfalls + Akteursnamen.
  let auditRows: {
    id: string;
    createdAt: Date;
    actorId: string | null;
    action: string;
    after: unknown;
  }[] = [];
  let actorNames: Record<string, string> = {};
  if (modalIncident && params.detail) {
    const rows = await db.auditLog.findMany({
      where: { entity: "incident", entityId: modalIncident.id },
      orderBy: { createdAt: "asc" },
      take: 200,
    });
    auditRows = rows.map((r) => ({
      id: r.id,
      createdAt: r.createdAt,
      actorId: r.actorId,
      action: r.action,
      after: r.after,
    }));
    const actorIds = new Set<string>();
    rows.forEach((r) => r.actorId && actorIds.add(r.actorId));
    modalIncident.comments.forEach((c) => c.authorId && actorIds.add(c.authorId));
    const actors = await db.user.findMany({
      where: { id: { in: [...actorIds] } },
      select: { id: true, name: true },
    });
    actorNames = Object.fromEntries(actors.map((a) => [a.id, a.name]));
  }

  // Für das Bearbeiten-Popup: Auswahl-Listen (nur noch nicht verknüpfte).
  const needsEdit = canManage && params.edit && modalIncident;
  const [availableAssets, availableProcesses, availableRisks, availableMeasures, availableEvidence] = needsEdit
    ? await Promise.all([
        db.asset.findMany({
          where: { id: { notIn: modalIncident.incidentAssets.map((x) => x.assetId) } },
          select: { id: true, name: true },
          orderBy: { name: "asc" },
        }),
        db.process.findMany({
          where: { id: { notIn: modalIncident.incidentProcesses.map((x) => x.processId) } },
          select: { id: true, name: true },
          orderBy: { name: "asc" },
        }),
        db.risk.findMany({
          where: { id: { notIn: modalIncident.incidentRisks.map((x) => x.riskId) } },
          select: { id: true, refNo: true, title: true },
          orderBy: { refNo: "asc" },
        }),
        db.measure.findMany({
          where: { id: { notIn: modalIncident.incidentMeasures.map((x) => x.measureId) } },
          select: { id: true, refNo: true, title: true },
          orderBy: { refNo: "asc" },
        }),
        db.evidence.findMany({
          where: { id: { notIn: modalIncident.incidentEvidence.map((x) => x.evidenceId) } },
          select: { id: true, title: true },
          orderBy: { createdAt: "desc" },
          take: 200,
        }),
      ])
    : [[], [], [], [], []];

  // Aktive Nutzer für Owner-/Bearbeiter-/Maßnahmen-Auswahl (Detail + Bearbeiten).
  const users =
    modalIncident && canManage
      ? await db.user.findMany({ where: { status: "ACTIVE" }, select: { id: true, name: true }, orderBy: { name: "asc" } })
      : [];

  // NIS2-Betroffenheit des Mandanten steuert die Anzeige/Timer (§6) im Detail.
  const nis2Category =
    modalIncident && params.detail
      ? (await db.tenantSettings.findUnique({ where: { tenantId: session.user.tenantId }, select: { nis2Category: true } }))?.nis2Category ?? "keine"
      : "keine";

  const filterLink = (patch: Record<string, string | undefined>) => {
    const sp = new URLSearchParams();
    const merged = { status: params.status, severity: params.severity, category: params.category, ...patch };
    for (const [k, v] of Object.entries(merged)) if (v) sp.set(k, v);
    const qs = sp.toString();
    return `/incidents${qs ? `?${qs}` : ""}`;
  };

  return (
    <main className="flex-1 p-6">
      <PageHead
        crumb={t("crumb")}
        title={t("title")}
        sub={t("sub")}
        actions={
          <div className="flex flex-wrap items-center gap-2">
            <a href="/incidents/export?format=register-csv" className="rounded-md border px-3 py-1.5 text-[12px] hover:bg-muted">
              {t("exportRegisterCsv")}
            </a>
            <a href="/incidents/export?format=register-xlsx" className="rounded-md border px-3 py-1.5 text-[12px] hover:bg-muted">
              {t("exportRegisterXlsx")}
            </a>
            {canReport ? (
              <Button nativeButton={false} render={<Link href="/incidents?new=1" />}>
                <Plus className="size-4" /> {t("newIncident")}
              </Button>
            ) : null}
          </div>
        }
      />

      <div className="grid gap-4">
        {/* Filterleiste */}
        <div className="shadow-card flex flex-wrap items-center gap-2 rounded-xl border bg-card p-3 text-[12px]">
          <span className="text-muted-foreground">{t("filter")}:</span>
          <Link href={filterLink({ status: undefined, severity: undefined, category: undefined })} className="rounded-md border px-2 py-1 hover:bg-muted">{t("filterAll")}</Link>
          <span className="mx-1 h-4 w-px bg-border" />
          {INCIDENT_STATUSES.map((s) => (
            <Link key={s} href={filterLink({ status: params.status === s ? undefined : s })} className={`rounded-md border px-2 py-1 hover:bg-muted ${params.status === s ? "bg-muted font-semibold" : ""}`}>{tStatus(s)}</Link>
          ))}
          <span className="mx-1 h-4 w-px bg-border" />
          {INCIDENT_SEVERITIES.map((s) => (
            <Link key={s} href={filterLink({ severity: params.severity === s ? undefined : s })} className={`rounded-md border px-2 py-1 hover:bg-muted ${params.severity === s ? "bg-muted font-semibold" : ""}`}>{tSev(s)}</Link>
          ))}
        </div>

        {/* Register */}
        <div className="shadow-card rounded-xl border bg-card">
          <div className="p-4 pb-0">
            <SectTitle title={t("register")} sub={t("registerSub")} />
          </div>
          <Table className="mt-1">
            <TableHeader>
              <TableRow>
                <TableHead>{t("id")}</TableHead>
                <TableHead>{t("incident")}</TableHead>
                <TableHead>{t("category")}</TableHead>
                <TableHead>{t("severity")}</TableHead>
                <TableHead>{t("status")}</TableHead>
                <TableHead>{t("owner")}</TableHead>
              </TableRow>
            </TableHeader>
            <TableBody>
              {incidents.length === 0 && (
                <TableRow>
                  <TableCell colSpan={6} className="py-8 text-center text-muted-foreground">{t("empty")}</TableCell>
                </TableRow>
              )}
              {incidents.map((inc) => (
                <TableRow key={inc.id}>
                  <TableCell className="text-muted-foreground">{inc.refNo}</TableCell>
                  <TableCell>
                    <Link href={`/incidents?detail=${inc.id}`} className="font-bold hover:underline">
                      {inc.restricted ? "🔒 " : ""}{inc.title}
                    </Link>
                  </TableCell>
                  <TableCell><Tag>{tCat(inc.category)}</Tag></TableCell>
                  <TableCell><Pill tone={SEVERITY_TONE[inc.severity as keyof typeof SEVERITY_TONE] ?? "mut"}>{tSev(inc.severity)}</Pill></TableCell>
                  <TableCell><Pill tone={STATUS_TONE[inc.status as IncidentStatus] ?? "mut"}>{tStatus(inc.status)}</Pill></TableCell>
                  <TableCell className="text-muted-foreground">{inc.owner?.name ?? "—"}</TableCell>
                </TableRow>
              ))}
            </TableBody>
          </Table>
        </div>
      </div>

      {modalIncident && params.edit && canManage ? (
        <IncidentEditModal
          incident={modalIncident}
          availableAssets={availableAssets}
          availableProcesses={availableProcesses}
          availableRisks={availableRisks}
          availableMeasures={availableMeasures}
          availableEvidence={availableEvidence}
          users={users}
        />
      ) : modalIncident ? (
        <IncidentDetailModal
          incident={modalIncident}
          audit={auditRows}
          actorNames={actorNames}
          users={users}
          canManage={canManage}
          canClose={canClose}
          canReport={canReport}
          nis2Category={nis2Category}
        />
      ) : params.new && canReport ? (
        <IncidentCreateModal />
      ) : null}
    </main>
  );
}