// Pure heuristic from public/js/correctionTracker.js — used by
// EditableResult to decide whether a user's inline edit to AI output
// is "meaningful" enough to push to /api/memories/correction.
//
// The threshold matches vanilla exactly so we don't drift behaviour
// between the two clients during the migration window.

export function isMeaningfulChange(original: string, current: string): boolean {
  if (!original || !current) return false;
  if (original.trim() === current.trim()) return false;
  const origWords = original.split(/\s+/).length;
  const currWords = current.split(/\s+/).length;
  const wordDiff = Math.abs(origWords - currWords);
  if (wordDiff < 2 && original.length > 100) {
    const charDiff = Math.abs(original.length - current.length);
    if (charDiff < 20) return false;
  }
  return true;
}