/* istanbul ignore file */
export const getCalendarDays = (date: Date) => {
  const daysInMonth = new Date(
    date.getFullYear(),
    date.getMonth() + 1,
    0
  ).getDate();

  const days = [...Array(daysInMonth).keys()].map((day) => day + 1);

  const firstDayOfWeek = new Date(
    date.getFullYear(),
    date.getMonth(),
    1
  ).getDay();

  const lastDayOfWeek = new Date(
    date.getFullYear(),
    date.getMonth(),
    daysInMonth
  ).getDay();

  const fillerBefore = [...Array(firstDayOfWeek).keys()].map(
    () => null
  );
  const fillerAfter = [...Array(6 - lastDayOfWeek).keys()].map(
    () => null
  );

  return [...fillerBefore, ...days, ...fillerAfter];
};

export const getNextDay = (date: Date) => {
  return new Date(
    date.getFullYear(),
    date.getMonth(),
    date.getDate() + 1
  );
};

export const getPreviousDay = (date: Date) => {
  return new Date(
    date.getFullYear(),
    date.getMonth(),
    date.getDate() - 1
  );
};

export const getNextWeek = (date: Date) => {
  return new Date(
    date.getFullYear(),
    date.getMonth(),
    date.getDate() + 7
  );
};

export const getPreviousWeek = (date: Date) => {
  return new Date(
    date.getFullYear(),
    date.getMonth(),
    date.getDate() - 7
  );
};

export const getDateString = (date: Date | undefined) => {
  if (date) {
    return `${
      date.getMonth() + 1
    }/${date.getDate()}/${date.getFullYear()}`;
  } else {
    return "";
  }
};