src/lib/script.ts

// Turn a written script into estimated word timings (~2.7 words/sec + punctuation
// pauses) so a script-only project (no recording yet) can still drive the timeline,
// captions and preview. Real timings replace these once you record/transcribe or TTS it.
// cap so a runaway paste can't create a multi-hour timeline (and a giant render job)
export const MAX_SCRIPT_WORDS = 4000;
export function scriptToWords(script: string): { text: string; startMs: number; endMs: number }[] {
  const tokens = String(script || "").replace(/\s+/g, " ").trim().split(" ").filter(Boolean).slice(0, MAX_SCRIPT_WORDS);
  const out: { text: string; startMs: number; endMs: number }[] = [];
  let t = 0;
  for (const tok of tokens) {
    const letters = tok.replace(/[^\p{L}\p{N}]/gu, "").length || 1;
    const dur = Math.max(180, Math.min(620, 70 * letters + 110));
    out.push({ text: tok, startMs: t, endMs: t + dur });
    t += dur + (/[.!?]$/.test(tok) ? 320 : /[,;:]$/.test(tok) ? 160 : 50);
  }
  return out;
}