// Best-effort guess at whether a license permits commercial use (selling prints),
// from its name/abbreviation or — preferably — its full license text. Returns
// true / false / null (unknown). This is a hint only; the UI tells the user to
// verify before selling, and it deliberately leans toward NOT sellable when
// ambiguous (the safer error for "can I sell this?").
function inferCommercial(text) {
  if (!text) return null;
  const s = String(text).replace(/<[^>]*>/g, ' ').toLowerCase();

  // Restrictive / non-commercial — checked first so it wins over stray "sell"s.
  if (/non-?commercial|personal use|community use|[-_\s]nc([-_\s]|$)|exclusive|standard digital file|all rights reserved|^\s*none\s*$|charge money|shall not[^.]*\bsell|not be sold/.test(s)) {
    return false;
  }
  // Clearly permissive (commercial use OK). NC variants are already excluded above.
  if (/cc0|public ?domain|creative commons|attribution|cc[-_\s]?by|^\s*mit\b|^\s*bsd\b|^\s*l?gpl\b|royalty[- ]free|commercial use (is )?(allowed|permitted)|may be sold/.test(s)) {
    return true;
  }
  return null;
}

module.exports = { inferCommercial };