export function formatTimer(totalSeconds: number) {
  const hours = Math.floor(totalSeconds / 3600);
  const minutes = Math.floor((totalSeconds % 3600) / 60);
  const seconds = totalSeconds % 60;

  return [hours, minutes, seconds].map((part) => String(part).padStart(2, "0")).join(":");
}

export function formatMinutes(minutes: number) {
  const hours = Math.floor(minutes / 60);
  const rest = minutes % 60;

  if (hours === 0) {
    return `${rest} min`;
  }

  if (rest === 0) {
    return `${hours} h`;
  }

  return `${hours} h ${rest} min`;
}

export function formatDateTime(value: string) {
  return new Intl.DateTimeFormat("de-DE", {
    dateStyle: "medium",
    timeStyle: "short"
  }).format(new Date(value));
}

export function formatDate(value: string) {
  return new Intl.DateTimeFormat("de-DE", {
    weekday: "long",
    day: "2-digit",
    month: "2-digit",
    year: "numeric"
  }).format(new Date(value));
}

export function formatTime(value: string) {
  return new Intl.DateTimeFormat("de-DE", {
    hour: "2-digit",
    minute: "2-digit"
  }).format(new Date(value));
}

export function formatTimeRange(start: string, end: string) {
  return `${formatTime(start)} - ${formatTime(end)}`;
}

export function currentMonth() {
  const now = new Date();
  return `${now.getFullYear()}-${String(now.getMonth() + 1).padStart(2, "0")}`;
}

export function currentWeek() {
  const now = new Date();
  const date = new Date(Date.UTC(now.getFullYear(), now.getMonth(), now.getDate()));
  const weekday = date.getUTCDay() || 7;
  date.setUTCDate(date.getUTCDate() + 4 - weekday);
  const yearStart = new Date(Date.UTC(date.getUTCFullYear(), 0, 1));
  const week = Math.ceil(((date.getTime() - yearStart.getTime()) / 86_400_000 + 1) / 7);

  return `${date.getUTCFullYear()}-W${String(week).padStart(2, "0")}`;
}

export function currentDay() {
  const now = new Date();
  return `${now.getFullYear()}-${String(now.getMonth() + 1).padStart(2, "0")}-${String(now.getDate()).padStart(2, "0")}`;
}