from howlongtobeatpy import HowLongToBeat


def _h(val):
    """Return float hours if valid, else None."""
    try:
        v = float(val)
        return v if v > 0 else None
    except (TypeError, ValueError):
        return None


def fetch(game_name):
    """
    Search HowLongToBeat for game_name.
    Returns dict with keys 'main', 'extra', 'complete' (each float or None),
    or None if nothing found / on any error.
    """
    try:
        results = HowLongToBeat().search(game_name)
    except Exception:
        return None

    if not results:
        return None

    best = max(results, key=lambda r: r.similarity)
    if best.similarity < 0.4:
        return None

    return {
        'main': _h(best.main_story),
        'extra': _h(best.main_extra),
        'complete': _h(best.completionist),
    }


def apply_to_item(item):
    """Fetch HLTB data and save it onto item. Silently does nothing on failure."""
    if item.category != 'games' or not item.name:
        return
    data = fetch(item.name)
    if data is None:
        return
    item.hltb_main = data['main']
    item.hltb_extra = data['extra']
    item.hltb_complete = data['complete']
    item.save(update_fields=['hltb_main', 'hltb_extra', 'hltb_complete'])