"use client";

import { useActionState } from "react";
import { updateMileageSettingsAction } from "@/lib/actions/admin";
import type { SettingsDoc } from "@/models/Settings";

export function MileageSettingsPanel({ mileageSettings }: { mileageSettings: SettingsDoc["mileageSettings"] }) {
  const [state, formAction, pending] = useActionState(updateMileageSettingsAction, {});

  return (
    <form
      action={formAction}
      className="bg-[var(--rk-surface)] border border-white/10 rounded-2xl p-6 flex flex-col gap-4 max-w-2xl mb-8"
    >
      <p className="text-sm font-medium">Kilometerpauschale</p>
      <p className="text-xs text-[var(--rk-ink-muted)]">
        Standardsatz pro Kilometer für den Fahrtkosten-Rechner (Finanzen → Fahrtkosten) — dort pro Berechnung noch
        überschreibbar. 0,30 €/km ist der gängige Richtwert, kein verbindlicher Steuerwert.
      </p>

      <label className="flex flex-col gap-1.5 text-xs max-w-xs">
        <span className="text-[var(--rk-ink-muted)]">€ pro km</span>
        <input
          name="ratePerKm"
          type="number"
          min="0"
          max="5"
          step="0.01"
          defaultValue={mileageSettings?.ratePerKm ?? 0.3}
          className="bg-transparent border border-white/15 rounded-lg px-3 py-2 text-sm focus:outline-none focus:border-white/50"
        />
      </label>

      <button
        type="submit"
        disabled={pending}
        className="self-start border border-white/30 rounded-lg px-4 py-2 text-xs uppercase tracking-[0.15em] hover:border-white disabled:opacity-50"
      >
        Speichern
      </button>
      {state.error && <p className="text-sm text-red-400">{state.error}</p>}
      {state.success && <p className="text-sm text-emerald-400">Gespeichert.</p>}
    </form>
  );
}