import clsx from "clsx";

export function cn(...inputs: Array<string | false | null | undefined>) {
  return clsx(inputs);
}

export function formatDateInput(date: Date) {
  return date.toISOString().split("T")[0] ?? "";
}

export function startOfDay(date: Date) {
  const value = new Date(date);
  value.setHours(0, 0, 0, 0);
  return value;
}

export function endOfDay(date: Date) {
  const value = new Date(date);
  value.setHours(23, 59, 59, 999);
  return value;
}

export function toDateKey(date: Date) {
  const year = date.getFullYear();
  const month = String(date.getMonth() + 1).padStart(2, "0");
  const day = String(date.getDate()).padStart(2, "0");
  return `${year}-${month}-${day}`;
}

export function parseDateKey(dateKey: string) {
  const [year, month, day] = dateKey.split("-").map(Number);

  if (!year || !month || !day) {
    return null;
  }

  const value = new Date(year, month - 1, day);
  return Number.isNaN(value.getTime()) ? null : value;
}