export function getSubstitutionText(substitution, includeClass) {
  const includeClassValue = includeClass ? "withClass" : "withoutClass";

  // TODO: implement more texts
  if (substitution.type == "change") {
    if (
      substitution.teacher == substitution.change.teacher ||
      !substitution.change.teacher
    ) {
      return `substitution.text.${includeClassValue}.subjectChange`;
    } else {
      return `substitution.text.${includeClassValue}.teacherChange`;
    }
  } else if (substitution.type == "cancellation") {
    return `substitution.text.${includeClassValue}.cancellation`;
  }
  return "";
}

export function getSubstitutionColor(substitution) {
  if (!substitution) return;
  switch (substitution.type) {
    case "change":
      return "background-color: var(--substitution-background-change);";
    case "cancellation":
      return "background-color: var(--substitution-background-cancellation);";
  }
}

export function getDateSkippingWeekend(date, onlyNext) {
  // Go from saturday to next monday
  if (date.getDay() == 6) return new Date(date.getTime() + 86400000 * 2);
  // Go from sunday to last friday or next monday
  if (date.getDay() == 0)
    return new Date(
      onlyNext ? date.getTime() + 86400000 * 1 : date.getTime() - 86400000 * 2,
    );
  return date;
}

export function getNextAndPrevDay(date) {
  return [
    new Date(date.getTime()),
    getDateSkippingWeekend(new Date(date.getTime() + 86400000)),
    getDateSkippingWeekend(new Date(date.getTime() - 86400000)),
  ].map((e) => e.getTime());
}

export function setUTCMidnight(date) {
  // Set the time to UTC midnight while keeping the correct date
  return new Date(
    Date.UTC(date.getFullYear(), date.getMonth(), date.getDate()),
  );
}