export const MIN_UTTERANCE_CHARS = 3;

export function isMeaningfulTranscript(text) {
  const value = String(text || '').trim();
  if (!value || /\[no speech detected\]|\[blank_audio\]/i.test(value)) return false;
  if (/^\[[^\]]+\]$/.test(value)) return false;
  return value.replace(/[^\p{L}\p{N}]/gu, '').length >= MIN_UTTERANCE_CHARS;
}

export class SentenceBuffer {
  constructor({ onSentence } = {}) { this.onSentence = onSentence; this.pending = ''; }
  push(text) {
    this.pending += String(text || '');
    const sentences = [];
    let match;
    while ((match = this.pending.match(/^(.+?[.!?](?:["')\]]+)?)(?:\s+|$)/s))) {
      sentences.push(match[1].trim()); this.pending = this.pending.slice(match[0].length);
    }
    for (const sentence of sentences) this.onSentence?.(sentence);
    return sentences;
  }
  flush() { const value = this.pending.trim(); this.pending = ''; if (value) this.onSentence?.(value); return value; }
  clear() { this.pending = ''; }
}