"""Tests unitaires de compute_new_value (screens/data_actions/compute_operation.py)
— logique partagée par apply_data_action.py (champ d'objet) et
apply_variable_action.py (variable globale), factorisée pour ne plus être
dupliquée dans les deux fichiers avant que la Phase 2 (hasard/opérations
mathématiques) n'y ajoute 6 nouvelles opérations. Verrouille le
comportement des 7 opérations existantes."""
import pytest

from screens.data_actions.compute_operation import compute_new_value


def test_definir_texte():
    assert compute_new_value("definir_texte", "ancien", "nouveau", False) == "nouveau"
    assert compute_new_value("definir_texte", "ancien", "", False) == ""
    assert compute_new_value("definir_texte", "ancien", None, False) == ""


def test_definir_nombre_entier_et_decimal():
    assert compute_new_value("definir_nombre", 0, "5", False) == 5
    assert isinstance(compute_new_value("definir_nombre", 0, "5", False), int)
    assert compute_new_value("definir_nombre", 0, "5.7", True) == 5.7
    assert compute_new_value("definir_nombre", 0, "pas un nombre", False) == 0


def test_definir_bool():
    assert compute_new_value("definir_bool_vrai", 0, None, False) == 1
    assert compute_new_value("definir_bool_faux", 1, None, False) == 0


def test_basculer_bool():
    assert compute_new_value("basculer_bool", 0, None, False) == 1
    assert compute_new_value("basculer_bool", 1, None, False) == 0
    assert compute_new_value("basculer_bool", None, None, False) == 1


def test_incrementer_decrementer_entier():
    assert compute_new_value("incrementer", 10, "5", False) == 15
    assert compute_new_value("decrementer", 10, "5", False) == 5
    assert compute_new_value("incrementer", None, "5", False) == 5


def test_incrementer_decimal_garde_les_decimales():
    result = compute_new_value("incrementer", 10.0, "0.5", True)
    assert result == 10.5
    assert isinstance(result, float)


def test_incrementer_valeur_invalide_ne_change_rien():
    assert compute_new_value("incrementer", 10, "pas un nombre", False) == 10


def test_operation_inconnue_leve_value_error():
    with pytest.raises(ValueError):
        compute_new_value("multiplier", 10, "2", False)