import type { Dayjs } from "dayjs";

export const formatDate = (start: Dayjs, end: Dayjs) => {
  const startDateString = getDateString(start);
  const endDateString = getDateString(end);

  // if start isundefined, dont show the day twice

  if (!start.isValid() && !end.isValid()) {
    return "Termin nicht festgelegt";
  }

  if (!start || (!start.isValid() && end.isValid())) {
    return `${endDateString} ${getTimeString(end)} ${end.format("[Uhr]")}`;
  }
  if (!end || (!end.isValid() && start.isValid())) {
    return `${startDateString} ${getTimeString(start)} ${start.format("[Uhr]")}`;
  }

  // if start and end are on the same day, dont show the day twice
  if (startDateString === endDateString) {
    return `${startDateString} ${getTimeString(start)} - ${getTimeString(
      end
    )} ${end.format("[Uhr]")}`;
  }

  return `${startDateString} ${getTimeString(start)} - ${endDateString} ${getTimeString(
    end
  )}`;
};

export const getTimeString = (date?: Dayjs) => {
  if (date) {
    return `${date.format("H:mm")}`;
  }
  return "";
};

export const getDateString = (date?: Dayjs) => {
  if (date) {
    return `${date.format("D. MMMM YYYY")}`;
  }
  return "";
};

export const getWeekday = (date: Dayjs) => {
  if (date) {
    return `${date.format("dd")}`;
  }
  return "";
};