import {
  DutyAssignmentStatus,
  EventParticipationStatus,
  TerminStatus,
  UserRole,
} from "@prisma/client";

import { requireKitaSession } from "@/lib/auth-utils";
import { prisma } from "@/lib/prisma";
import { AdminTerminModal } from "./_components/admin-termin-modal";
import { PendingAnfragen, type PendingTerminDto } from "./_components/pending-anfragen";
import { TerminList, type CalendarListItemDto } from "./_components/termin-list";
import { TerminRequestModal } from "./_components/termin-request-modal";

export default async function KalenderPage({
  searchParams,
}: {
  searchParams: { tab?: string };
}) {
  const session = await requireKitaSession();
  const isAdmin =
    session.user.role === UserRole.ADMIN ||
    session.user.role === UserRole.KOORDINATOR;
  const familyIdForParticipation = session.user.familyId ?? "__no_family__";

  const currentTab = searchParams.tab || "übersicht";

  const confirmedTermineRows = await prisma.termin.findMany({
    where: {
      kitaId: session.user.kitaId,
      status: TerminStatus.CONFIRMED,
    },
    select: {
      id: true,
      title: true,
      description: true,
      type: true,
      status: true,
      startDate: true,
      endDate: true,
      allDay: true,
      mitbringselListEnabled: true,
      requiresRsvp: true,
      participantInfo: true,
      mitbringselItems: {
        select: {
          id: true,
          userId: true,
          content: true,
          user: {
            select: {
              firstName: true,
              lastName: true,
            },
          },
        },
      },
      participations: {
        where: {
          child: {
            familyId: familyIdForParticipation,
          },
        },
        select: {
          childId: true,
          status: true,
        },
      },
    },
    orderBy: { startDate: "asc" },
  });

  const myPendingTermineRows = await prisma.termin.findMany({
    where: {
      kitaId: session.user.kitaId,
      status: TerminStatus.PENDING,
      createdById: session.user.id,
    },
    select: {
      id: true,
      title: true,
      description: true,
      type: true,
      status: true,
      startDate: true,
      endDate: true,
      allDay: true,
      mitbringselListEnabled: true,
      requiresRsvp: true,
      participantInfo: true,
      mitbringselItems: {
        select: {
          id: true,
          userId: true,
          content: true,
          user: {
            select: {
              firstName: true,
              lastName: true,
            },
          },
        },
      },
      participations: {
        where: {
          child: {
            familyId: familyIdForParticipation,
          },
        },
        select: {
          childId: true,
          status: true,
        },
      },
    },
    orderBy: { startDate: "asc" },
  });

  const dutyAssignmentRows = await prisma.dutyAssignment.findMany({
    where: {
      kitaId: session.user.kitaId,
      status: DutyAssignmentStatus.PLANNED,
      endDate: { gte: new Date() },
    },
    select: {
      id: true,
      startDate: true,
      endDate: true,
      status: true,
      dutyType: {
        select: {
          name: true,
        },
      },
      family: {
        select: {
          name: true,
        },
      },
    },
    orderBy: { startDate: "asc" },
  });

  const allUserTermine: CalendarListItemDto[] = [
    ...confirmedTermineRows.map((termin) => ({
      ...termin,
      kind: "termin" as const,
      showParticipantInfo:
        isAdmin ||
        termin.participations.some(
          (participation) =>
            participation.status === EventParticipationStatus.ATTENDING,
        ),
    })),
    ...myPendingTermineRows.map((termin) => ({
      ...termin,
      kind: "termin" as const,
      showParticipantInfo:
        isAdmin ||
        termin.participations.some(
          (participation) =>
            participation.status === EventParticipationStatus.ATTENDING,
        ),
    })),
    ...dutyAssignmentRows.map((assignment) => ({
      kind: "duty" as const,
      id: assignment.id,
      title: assignment.dutyType.name,
      familyName: assignment.family.name,
      status: assignment.status,
      startDate: assignment.startDate,
      endDate: assignment.endDate,
    })),
  ].sort((a, b) => a.startDate.getTime() - b.startDate.getTime());

  let allPendingTermine: PendingTerminDto[] = [];
  if (isAdmin) {
    allPendingTermine = await prisma.termin.findMany({
      where: {
        kitaId: session.user.kitaId,
        status: TerminStatus.PENDING,
      },
      select: {
        id: true,
        title: true,
        startDate: true,
        allDay: true,
        createdBy: {
          select: {
            firstName: true,
            lastName: true,
          },
        },
      },
      orderBy: { createdAt: "desc" },
    });
  }

  return (
    <div className="flex h-full flex-col gap-6 p-6">
      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-2xl font-bold tracking-tight">Terminkalender</h1>
          <p className="text-muted-foreground">
            Alle anstehenden Termine, Feste und Schließtage im Überblick.
          </p>
        </div>
        <div className="flex gap-2">
          <TerminRequestModal />
          {isAdmin && <AdminTerminModal />}
        </div>
      </div>

      {isAdmin ? (
        <div className="flex flex-col gap-4">
          <div className="flex gap-4 border-b">
            <a
              href="/dashboard/kalender?tab=übersicht"
              className={`pb-2 text-sm font-medium transition-colors hover:text-primary ${
                currentTab === "übersicht"
                  ? "border-b-2 border-primary text-primary"
                  : "text-muted-foreground"
              }`}
            >
              Übersicht
            </a>
            <a
              href="/dashboard/kalender?tab=anfragen"
              className={`flex items-center gap-2 pb-2 text-sm font-medium transition-colors hover:text-primary ${
                currentTab === "anfragen"
                  ? "border-b-2 border-primary text-primary"
                  : "text-muted-foreground"
              }`}
            >
              Ausstehende Anfragen
              {allPendingTermine.length > 0 && (
                <span className="flex h-5 w-5 items-center justify-center rounded-full bg-primary text-[10px] text-primary-foreground">
                  {allPendingTermine.length}
                </span>
              )}
            </a>
          </div>

          <div className="pt-2">
            {currentTab === "übersicht" ? (
              <TerminList
                termine={allUserTermine}
                userId={session.user.id}
                isAdmin={isAdmin}
              />
            ) : (
              <PendingAnfragen termine={allPendingTermine} />
            )}
          </div>
        </div>
      ) : (
        <TerminList
          termine={allUserTermine}
          userId={session.user.id}
          isAdmin={isAdmin}
        />
      )}
    </div>
  );
}