from engine.entity import Entity, EntityPosition
from engine.map import Map
from engine.tile import Tile, TileLayerInstance
from engine.world import World


class FakeRegistry:
    def get_tile_layer_def(self, _layer, _def_id):
        return None


def make_world_with_gap():
    # a 10x10 field with a "water" gap (still walkable=True at the data level, but no dock
    # path) between the player's dock and a ship anchored two tiles away
    parent = Map("world", 10, 10, 1)
    for x in range(10):
        for y in range(10):
            parent.set_tile(x, y, 0, Tile(flooring=TileLayerInstance("grass")))

    ship = Map("ship", 3, 3, 1)
    for x in range(3):
        for y in range(3):
            ship.set_tile(x, y, 0, Tile(flooring=TileLayerInstance("wood_deck")))

    parent.embed(ship, (7, 5, 0))  # ship's footprint is x:7-9, y:5-7
    return parent, ship


def test_leap_crosses_a_gap_that_a_single_step_could_not():
    parent, ship = make_world_with_gap()
    world = World()
    world.maps = {"world": parent, "ship": ship}
    world.registry = FakeRegistry()

    player = Entity(position=EntityPosition("world", 5, 6, 0))
    # a single step east only reaches (6,6,0), still short of the ship at x=7
    assert world.try_move(player, 1, 0, 0) is True
    assert (player.position.x, player.position.y) == (6, 6)

    # leaping east 2 tiles clears the remaining gap and lands aboard the ship
    assert world.try_leap(player, 1, 0, 0) is True
    assert player.position.map_id == "ship"
    assert (player.position.x, player.position.y, player.position.z) == (1, 1, 0)


def test_leap_distance_is_configurable():
    parent, ship = make_world_with_gap()
    world = World()
    world.maps = {"world": parent, "ship": ship}
    world.registry = FakeRegistry()

    player = Entity(position=EntityPosition("world", 4, 6, 0))
    assert world.try_leap(player, 1, 0, 0, distance=1) is True
    assert player.position.map_id == "world"  # a 1-tile leap from x=4 lands short of the ship at x=7
    assert (player.position.x, player.position.y) == (5, 6)


def test_leap_lands_out_of_bounds_fails_like_a_normal_move():
    parent, ship = make_world_with_gap()
    world = World()
    world.maps = {"world": parent, "ship": ship}
    world.registry = FakeRegistry()

    player = Entity(position=EntityPosition("world", 0, 0, 0))
    assert world.try_leap(player, -1, 0, 0) is False
    assert (player.position.x, player.position.y) == (0, 0)