export interface PasswordMatchGroupLike {
  get(name: 'password' | 'passwordConfirm'): { value: string | null | undefined } | null;
}

export interface PasswordMatchResult {
  passwordMismatch?: boolean;
}

/**
 * Group-level validator for the "Confirm Password" field.
 * Returns `{ passwordMismatch: true }` when the two values differ,
 * or `null` when they match (or when either is empty, so that
 * `required`/`minlength` validators can take over).
 */
export function passwordMatchValidator(group: PasswordMatchGroupLike): PasswordMatchResult | null {
  const password = group.get('password')?.value;
  const confirm = group.get('passwordConfirm')?.value;
  if (!password || !confirm) return null;
  return password === confirm ? null : { passwordMismatch: true };
}