import db


def apply_variable_action(slug, action):
    """Exécute au moment du clic (mode jouable) une action
    "modifier_variable" — même logique/vocabulaire d'opérations que
    apply_data_action.py (DATA_OPERATIONS), appliqué à une variable globale
    (une seule valeur pour tout le jeu) plutôt qu'au champ d'une ligne
    d'objet."""
    var_name = action.get("target_variable")
    operation = action.get("data_operation")
    raw_value = action.get("data_value")
    if not (var_name and operation):
        return False
    variable = db.get_global_variable(slug, var_name)
    if not variable:
        return False
    var_type = variable["type"]
    current = variable.get("value")
    if var_type in ("nombre_entier", "nombre_decimal"):
        try:
            current = float(current) if current not in (None, "") else 0
        except (TypeError, ValueError):
            current = 0
    elif var_type == "booleen":
        current = 1 if str(current).strip().lower() in ("1", "true", "vrai") else 0

    if operation == "definir_texte":
        new_value = raw_value or ""
    elif operation == "definir_nombre":
        try:
            new_value = float(raw_value) if var_type == "nombre_decimal" else int(float(raw_value))
        except (TypeError, ValueError):
            new_value = 0
    elif operation == "definir_bool_vrai":
        new_value = 1
    elif operation == "definir_bool_faux":
        new_value = 0
    elif operation == "basculer_bool":
        new_value = 0 if current else 1
    elif operation in ("incrementer", "decrementer"):
        try:
            amount = float(raw_value) if raw_value not in (None, "") else 0
        except (TypeError, ValueError):
            amount = 0
        if operation == "decrementer":
            amount = -amount
        result = (current or 0) + amount
        new_value = result if var_type == "nombre_decimal" else int(result)
    else:
        return False

    return db.update_global_variable_value(slug, var_name, new_value)