def map_feature_group(idx):
    if idx < 8:
        return "Statistical"
    elif idx < 8 + 5:
        return "AST"
    elif idx < 8 + 5 + 11:
        return "Stylometry"
    elif idx < 8 + 5 + 11 + 2:
        return "Language"
    else:
        return "Semantic"


def group_shap_explanations(shap_result):
    grouped = {}

    for item in shap_result:
        group = map_feature_group(item["feature_index"])
        grouped.setdefault(group, 0)
        grouped[group] += abs(item["impact"])

    return grouped