"use client";

import { useRouter, useSearchParams } from "next/navigation";
import { useCallback } from "react";

export type SettingsTabId =
  | "profil"
  | "ernaehrung"
  | "ziele"
  | "sicherheit"
  | "anwendung";

const tabs: { id: SettingsTabId; label: string; description: string }[] = [
  { id: "profil", label: "Profil", description: "Persönliche Daten und Kontakt" },
  { id: "ernaehrung", label: "Ernährung", description: "Rezept- und Mahlzeiten-Präferenzen" },
  { id: "ziele", label: "Ziele", description: "Kalorien, Makros, Gewicht, Fasten" },
  { id: "sicherheit", label: "Sicherheit", description: "2FA, Passkeys, Passwort" },
  { id: "anwendung", label: "Anwendung", description: "Erscheinungsbild und Erinnerungen" },
];

export function useSettingsTab(): {
  active: SettingsTabId;
  setActive: (id: SettingsTabId) => void;
} {
  const router = useRouter();
  const search = useSearchParams();
  const tabParam = search.get("tab");
  const active: SettingsTabId =
    tabs.find((tab) => tab.id === tabParam)?.id ?? "profil";

  const setActive = useCallback(
    (id: SettingsTabId) => {
      const params = new URLSearchParams(search.toString());
      params.set("tab", id);
      router.replace(`/einstellungen?${params.toString()}`, { scroll: false });
    },
    [router, search],
  );

  return { active, setActive };
}

export function SettingsTabs({
  active,
  onChange,
}: {
  active: SettingsTabId;
  onChange: (id: SettingsTabId) => void;
}) {
  const activeMeta = tabs.find((tab) => tab.id === active);
  return (
    <div className="space-y-3">
      <div
        role="tablist"
        aria-label="Einstellungs-Kategorien"
        className="-mx-1 flex gap-2 overflow-x-auto px-1 pb-1"
      >
        {tabs.map((tab) => {
          const isActive = tab.id === active;
          return (
            <button
              key={tab.id}
              type="button"
              role="tab"
              aria-selected={isActive}
              onClick={() => onChange(tab.id)}
              className={`shrink-0 rounded-full px-4 py-2 text-sm font-semibold transition-colors ${
                isActive
                  ? "bg-[#0F766E] text-white shadow-sm"
                  : "bg-white text-gray-600 ring-1 ring-gray-200 hover:bg-gray-50"
              }`}
            >
              {tab.label}
            </button>
          );
        })}
      </div>
      {activeMeta?.description ? (
        <p className="px-1 text-sm text-gray-500">{activeMeta.description}</p>
      ) : null}
    </div>
  );
}