"use client";

import { clsx } from "clsx";
import {
  BookOpen,
  FileStack,
  History,
  LayoutDashboard,
  LogOut,
  Menu,
  Rocket,
  ScrollText,
  Server,
  Settings,
  Layers,
  X,
} from "lucide-react";
import Link from "next/link";
import { usePathname, useRouter } from "next/navigation";
import { useState } from "react";
import { istAktiv, type NavigationsEintrag } from "@/lib/navigation";
import type { Theme } from "@/lib/theme";
import { Symbol, Wortmarke } from "@/components/wortmarke";
import { ThemeUmschalter } from "@/components/theme-umschalter";

const SYMBOLE: Record<
  NavigationsEintrag["symbol"],
  React.ComponentType<{ size?: number; "aria-hidden"?: boolean }>
> = {
  uebersicht: LayoutDashboard,
  ausrollen: Rocket,
  verlauf: History,
  templates: Layers,
  vorlagen: FileStack,
  katalog: BookOpen,
  server: Server,
  protokoll: ScrollText,
  einstellungen: Settings,
};

type Eigenschaften = {
  eintraege: readonly NavigationsEintrag[];
  benutzer: { anzeigename: string; rolle: string };
  version: string;
  theme: Theme;
  serverUmschalter: React.ReactNode;
};

export function Seitenleiste({ eintraege, benutzer, version, theme, serverUmschalter }: Eigenschaften) {
  const pfad = usePathname();
  const router = useRouter();
  const [offen, setOffen] = useState(false);

  async function abmelden() {
    await fetch("/api/v1/auth/abmelden", { method: "POST" });
    router.replace("/anmelden");
    router.refresh();
  }

  const inhalt = (
    <div className="flex h-full flex-col gap-6 p-4">
      <Link href="/" className="flex items-center gap-2.5 px-2 pt-1" onClick={() => setOffen(false)}>
        <Symbol className="h-8 w-8 shrink-0" />
        <Wortmarke className="text-lg" />
      </Link>

      {serverUmschalter}

      <nav aria-label="Hauptnavigation" className="flex-1">
        <ul className="flex flex-col gap-0.5">
          {eintraege.map((eintrag) => {
            const Icon = SYMBOLE[eintrag.symbol];
            const aktiv = istAktiv(eintrag.pfad, pfad);
            return (
              <li key={eintrag.pfad}>
                <Link
                  href={eintrag.pfad}
                  onClick={() => setOffen(false)}
                  aria-current={aktiv ? "page" : undefined}
                  className={clsx(
                    "flex h-11 items-center gap-3 rounded-lg px-3 text-sm font-medium transition sm:h-10",
                    aktiv ? "bg-panel-hoch text-text" : "text-muted hover:text-text hover:bg-panel-hoch/60",
                  )}
                >
                  <span className={aktiv ? "text-akzent" : undefined}>
                    <Icon size={18} aria-hidden={true} />
                  </span>
                  {eintrag.titel}
                </Link>
              </li>
            );
          })}
        </ul>
      </nav>

      <div className="border-linie flex flex-col gap-3 border-t pt-4">
        <div className="flex items-center justify-between gap-2 px-2">
          <div className="min-w-0">
            <p className="truncate text-sm font-medium">{benutzer.anzeigename}</p>
            <p className="text-muted text-xs">{benutzer.rolle === "ADMIN" ? "Administrator" : "Operator"}</p>
          </div>
          <div className="flex items-center">
            <ThemeUmschalter anfang={theme} />
            <button
              type="button"
              onClick={abmelden}
              className="text-muted hover:text-text inline-flex h-10 w-10 items-center justify-center rounded-lg"
              aria-label="Abmelden"
              title="Abmelden"
            >
              <LogOut size={18} aria-hidden="true" />
            </button>
          </div>
        </div>
        <p className="text-muted px-2 font-mono text-xs">{version}</p>
      </div>
    </div>
  );

  return (
    <>
      {/* Handy: Kopfleiste mit Menüknopf, Navigation als Schublade. */}
      <div className="border-linie bg-panel sticky top-0 z-30 flex h-14 items-center justify-between border-b px-4 lg:hidden">
        <Link href="/" className="flex items-center gap-2">
          <Symbol className="h-7 w-7" />
          <Wortmarke />
        </Link>
        <button
          type="button"
          onClick={() => setOffen(true)}
          className="inline-flex h-11 w-11 items-center justify-center rounded-lg"
          aria-label="Navigation öffnen"
          aria-expanded={offen}
          aria-controls="seitenleiste"
        >
          <Menu size={22} aria-hidden="true" />
        </button>
      </div>

      {offen ? (
        <div
          className="fixed inset-0 z-40 bg-black/50 lg:hidden"
          aria-hidden="true"
          onClick={() => setOffen(false)}
        />
      ) : null}

      <aside
        id="seitenleiste"
        className={clsx(
          "border-linie bg-panel fixed inset-y-0 left-0 z-50 w-72 border-r transition-transform lg:sticky lg:top-0 lg:h-dvh lg:translate-x-0",
          offen ? "translate-x-0" : "-translate-x-full",
        )}
      >
        <button
          type="button"
          onClick={() => setOffen(false)}
          className="absolute top-3 right-3 inline-flex h-11 w-11 items-center justify-center rounded-lg lg:hidden"
          aria-label="Navigation schließen"
        >
          <X size={20} aria-hidden="true" />
        </button>
        {inhalt}
      </aside>
    </>
  );
}