import Link from "next/link";
import { requireKitaSession } from "@/lib/auth-utils";
import { prisma } from "@/lib/prisma";
import {
  absenceDate,
  absenceToday,
  canManageKitaAbsences,
} from "@/lib/absence-policy";
import { reasonLabel } from "@/lib/absence-utils";
import { AbsenceManagementActions } from "@/components/absence-management-actions";
import { Button } from "@/components/ui/button";
import { Card, CardContent } from "@/components/ui/card";
import { Badge } from "@/components/ui/badge";

export const metadata = { title: "Meine Abwesenheiten · Kita-Planer" };

export default async function OwnAbsencesPage({
  searchParams,
}: {
  searchParams: Promise<{ view?: string; page?: string }>;
}) {
  const session = await requireKitaSession();
  const actor = await prisma.user.findFirstOrThrow({
    where: { id: session.user.id, kitaId: session.user.kitaId },
    select: { familyId: true, role: true },
  });
  const query = await searchParams;
  const past = query.view === "past";
  const parsedPage = Number(query.page ?? 1);
  const requestedPage =
    Number.isSafeInteger(parsedPage) && parsedPage > 0 ? parsedPage : 1;
  const today = absenceToday();
  const where = {
    kitaId: session.user.kitaId,
    child: { kitaId: session.user.kitaId, familyId: actor.familyId ?? "" },
    endDate: past ? { lt: absenceDate(today) } : { gte: absenceDate(today) },
  };
  const count = actor.familyId ? await prisma.absence.count({ where }) : 0;
  const pages = Math.max(1, Math.ceil(count / 20));
  const page = Math.min(requestedPage, pages);
  const absences = actor.familyId
    ? await prisma.absence.findMany({
        where,
        select: {
          id: true,
          startDate: true,
          endDate: true,
          reason: true,
          note: true,
          updatedAt: true,
          child: { select: { firstName: true, lastName: true } },
        },
        orderBy: [{ startDate: past ? "desc" : "asc" }, { id: "asc" }],
        take: 20,
        skip: (page - 1) * 20,
      })
    : [];
  const href = (nextPage: number) =>
    `/dashboard/abwesenheiten?view=${past ? "past" : "current"}&page=${nextPage}`;
  const dateLabel = (date: Date) =>
    new Intl.DateTimeFormat("de-DE", {
      dateStyle: "medium",
      timeZone: "UTC",
    }).format(date);
  return (
    <div className="mx-auto max-w-[1100px] px-11 py-9 max-[760px]:px-5">
      <header className="mb-7">
        <p className="text-[11px] font-semibold uppercase tracking-widest text-[var(--accent-deep)]">
          MEIN HAUSHALT
        </p>
        <h1 className="mt-2 text-4xl tracking-tight">
          Meine{" "}
          <em className="font-normal text-[var(--accent-deep)]">
            Abwesenheiten
          </em>
        </h1>
        <p className="mt-3 max-w-2xl text-sm leading-6 text-[var(--ink-soft)]">
          Zukünftige Meldungen deiner Kinder kannst du ändern oder zurücknehmen.
          Sobald eine Meldung begonnen hat, übernimmt die Kita die gesamte
          Meldung.
        </p>
        <div className="mt-4 flex flex-wrap gap-2">
          <Button asChild variant="outline" size="sm">
            <Link href="/dashboard">Kind abmelden</Link>
          </Button>
          {canManageKitaAbsences(actor.role) && (
            <Button asChild variant="outline" size="sm">
              <Link href="/dashboard/admin/abwesenheiten">
                Kita-Tagesübersicht
              </Link>
            </Button>
          )}
        </div>
      </header>
      {!actor.familyId ? (
        <Card>
          <CardContent className="py-6">
            <p className="mb-3">
              Deinem Konto ist noch kein Haushalt zugeordnet.
            </p>
            <Button asChild variant="outline">
              <Link href="/dashboard/profil">Profil öffnen</Link>
            </Button>
          </CardContent>
        </Card>
      ) : (
        <>
          <nav aria-label="Abwesenheitszeitraum" className="mb-5 flex gap-2">
            <Button asChild size="sm" variant={!past ? "default" : "outline"}>
              <Link href="/dashboard/abwesenheiten">Aktuell & zukünftig</Link>
            </Button>
            <Button asChild size="sm" variant={past ? "default" : "outline"}>
              <Link href="/dashboard/abwesenheiten?view=past">Vergangen</Link>
            </Button>
          </nav>
          <p className="mb-3 text-sm text-[var(--ink-muted)]">
            {count} Meldung{count === 1 ? "" : "en"}
          </p>
          <div className="grid gap-4">
            {absences.length === 0 && (
              <Card>
                <CardContent className="py-8 text-sm text-[var(--ink-soft)]">
                  Für diesen Zeitraum sind keine Abwesenheiten gemeldet.
                </CardContent>
              </Card>
            )}
            {absences.map((absence) => {
              const startDate = absence.startDate.toISOString().slice(0, 10);
              return (
                <Card key={absence.id}>
                  <CardContent className="py-5">
                    <div className="flex flex-wrap items-start justify-between gap-3">
                      <div>
                        <h2 className="font-semibold">
                          {absence.child.firstName} {absence.child.lastName}
                        </h2>
                        <p className="mt-1 text-sm text-[var(--ink-soft)]">
                          {dateLabel(absence.startDate)}
                          {absence.endDate.getTime() !==
                          absence.startDate.getTime()
                            ? ` – ${dateLabel(absence.endDate)}`
                            : ""}{" "}
                          · {reasonLabel(absence.reason)}
                        </p>
                      </div>
                      <Badge variant="secondary">
                        {past
                          ? "Vergangen"
                          : startDate <= today
                            ? "Laufend"
                            : "Zukünftig"}
                      </Badge>
                    </div>
                    {absence.note && (
                      <p className="mt-3 whitespace-pre-wrap break-words text-sm text-[var(--ink-soft)]">
                        {absence.note}
                      </p>
                    )}
                    <AbsenceManagementActions
                      key={`${absence.id}-${absence.updatedAt.toISOString()}`}
                      today={today}
                      team={canManageKitaAbsences(actor.role)}
                      absence={{
                        id: absence.id,
                        reason: absence.reason,
                        note: absence.note,
                        childName: `${absence.child.firstName} ${absence.child.lastName}`,
                        startDate,
                        endDate: absence.endDate.toISOString().slice(0, 10),
                        updatedAt: absence.updatedAt.toISOString(),
                      }}
                    />
                  </CardContent>
                </Card>
              );
            })}
          </div>
          {pages > 1 && (
            <div className="mt-5 flex items-center justify-between gap-3">
              {page > 1 ? (
                <Button asChild variant="outline">
                  <Link href={href(page - 1)}>Zurück</Link>
                </Button>
              ) : (
                <span />
              )}
              <span className="text-sm text-[var(--ink-muted)]">
                Seite {page} von {pages}
              </span>
              {page < pages ? (
                <Button asChild variant="outline">
                  <Link href={href(page + 1)}>Weiter</Link>
                </Button>
              ) : (
                <span />
              )}
            </div>
          )}
        </>
      )}
    </div>
  );
}