/** Internal select value when respondent picks the configurable Other option. Never stored in submissions. */
export const SELECT_OTHER_VALUE = '__other__';

export type SelectOptionItem = string | { value: string; label: string };

export function normalizeSelectOptions(options: SelectOptionItem[] | undefined): { value: string; label: string }[] {
  return (options ?? []).map((o) => (typeof o === 'string' ? { value: o, label: o } : o));
}

export function isCustomSelectValue(
  value: unknown,
  optionValues: string[],
  allowOther?: boolean,
): boolean {
  if (!allowOther) return false;
  const stored = String(value ?? '').trim();
  if (!stored) return false;
  return !optionValues.includes(stored);
}

export function selectControlValue(
  value: unknown,
  optionValues: string[],
  allowOther?: boolean,
  otherValue = SELECT_OTHER_VALUE,
): string {
  const stored = String(value ?? '');
  if (isCustomSelectValue(stored, optionValues, allowOther)) return otherValue;
  return stored;
}

export function otherTextFromValue(
  value: unknown,
  optionValues: string[],
  allowOther?: boolean,
): string {
  if (!isCustomSelectValue(value, optionValues, allowOther)) return '';
  return String(value ?? '');
}