/** Show the remaining-count hint when this many characters (or fewer) are left. */
export function remainingThreshold(maxLength: number): number {
  return Math.max(8, Math.min(50, Math.round(maxLength / 10)));
}

export function characterRemainingVisible(length: number, maxLength: number): boolean {
  return maxLength - length <= remainingThreshold(maxLength);
}

export function characterRemainingLabel(remaining: number, maxLength: number): string {
  return remaining <= 0 ? `已达 ${maxLength} 字上限` : `还剩 ${remaining} 字`;
}

/** Stable live text: one announcement on entering the threshold, one at the cap. */
export function characterRemainingAnnouncement(remaining: number, maxLength: number): string {
  return remaining <= 0 ? `已达 ${maxLength} 字上限` : "接近字数上限";
}