import { clsx, type ClassValue } from "clsx";
import { twMerge } from "tailwind-merge";

export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs));
}

export function formatPrice(cents: number): string {
  return new Intl.NumberFormat("de-DE", {
    style: "currency",
    currency: "EUR",
    maximumFractionDigits: 0,
  }).format(cents / 100);
}

export function formatDate(date: Date | string): string {
  const d = typeof date === "string" ? new Date(date) : date;
  return new Intl.DateTimeFormat("de-DE", {
    day: "2-digit",
    month: "short",
    year: "numeric",
  }).format(d);
}

export function formatDateShort(date: Date | string): string {
  const d = typeof date === "string" ? new Date(date) : date;
  return new Intl.DateTimeFormat("de-DE", {
    day: "2-digit",
    month: "2-digit",
    year: "2-digit",
  }).format(d);
}

export function nightsBetween(arrival: Date | string, departure: Date | string): number {
  const a = typeof arrival === "string" ? new Date(arrival) : arrival;
  const d = typeof departure === "string" ? new Date(departure) : departure;
  return Math.round((d.getTime() - a.getTime()) / (1000 * 60 * 60 * 24));
}

export function parseJsonArray<T = string>(raw: string | null | undefined): T[] {
  if (!raw) return [];
  try {
    const parsed = JSON.parse(raw);
    return Array.isArray(parsed) ? (parsed as T[]) : [];
  } catch {
    return [];
  }
}