/** Split plain text into sentences for chunked TTS (aligned with AskJerry / ExperimentPage). */
export function extractTtsSentences(text: string, includeTrailing = false): string[] {
  const t = (text || '').trim()
  if (!t) return []
  const re = /[^.!?\n]+[.!?\n]+/g
  const sentences: string[] = []
  let match: RegExpExecArray | null
  let lastEnd = 0
  while ((match = re.exec(t)) !== null) {
    const s = match[0].trim()
    if (s) sentences.push(s)
    lastEnd = re.lastIndex
  }
  if (!sentences.length) return includeTrailing ? [t] : []
  if (includeTrailing) {
    const remainder = t.slice(lastEnd).trim()
    if (remainder) sentences.push(remainder)
  }
  return sentences
}