from engine.tile import Tile, TileLayerDef, TileLayerInstance


class FakeRegistry:
    def __init__(self, defs: dict[tuple[str, str], TileLayerDef]):
        self._defs = defs

    def get_tile_layer_def(self, layer, def_id):
        if def_id is None:
            return None
        return self._defs.get((layer, def_id))


def test_speed_multiplier_defaults_to_1_with_no_layers_set():
    tile = Tile()
    assert tile.speed_multiplier(FakeRegistry({})) == 1.0


def test_speed_multiplier_uses_flooring_defs_value():
    registry = FakeRegistry({("flooring", "mud"): TileLayerDef(id="mud", layer="flooring", speed_multiplier=0.6)})
    tile = Tile(flooring=TileLayerInstance("mud"))
    assert tile.speed_multiplier(registry) == 0.6


def test_speed_multiplier_takes_the_most_restrictive_of_room_and_flooring():
    registry = FakeRegistry({
        ("flooring", "mud"): TileLayerDef(id="mud", layer="flooring", speed_multiplier=0.6),
        ("room", "webbing"): TileLayerDef(id="webbing", layer="room", speed_multiplier=0.3),
    })
    tile = Tile(flooring=TileLayerInstance("mud"), room=TileLayerInstance("webbing"))
    assert tile.speed_multiplier(registry) == 0.3


def test_speed_multiplier_unaffected_by_an_unrelated_def_with_no_slow():
    registry = FakeRegistry({("flooring", "grass"): TileLayerDef(id="grass", layer="flooring")})
    tile = Tile(flooring=TileLayerInstance("grass"))
    assert tile.speed_multiplier(registry) == 1.0


def test_has_any_layer_false_for_a_bare_tile():
    assert Tile().has_any_layer() is False


def test_has_any_layer_true_if_any_single_layer_is_set():
    assert Tile(flooring=TileLayerInstance("dirt")).has_any_layer() is True
    assert Tile(room=TileLayerInstance("solid_rock")).has_any_layer() is True
    assert Tile(roof=TileLayerInstance("cave_ceiling")).has_any_layer() is True
    assert Tile(subfloor=TileLayerInstance("dirt")).has_any_layer() is True