from engine import Engine
from entity import Entity

class Action:
	def apply(self, engine: Engine, entity: Entity) -> None:
		raise NotImplementedError()

class QuitAction(Action):
	def apply(self, engine: Engine, entity: Entity) -> None:
		raise SystemExit()


class DirectionAction(Action):
	def __init__(self, xdir: int, ydir: int):
		super().__init__()
		self.xdir = xdir
		self.ydir = ydir

	def apply(self, engine: Engine, entity: Entity) -> None:
		raise NotImplementedError()


class MovementAction(DirectionAction):
	def apply(self, engine: Engine, entity: Entity) -> None:
		dest_x = entity.x + self.xdir
		dest_y = entity.y + self.ydir

		#bounds and collision checks
		if not engine.floor_map.in_bounds(dest_x, dest_y):
			return
		if not engine.floor_map.tiles["walkable"][dest_x, dest_y]:
			return
		if engine.floor_map.get_entity_at(dest_x, dest_y, unwalkable_only=True) is not None:
			return

		entity.set_pos(dest_x, dest_y)

class MeleeAction(DirectionAction):
	def apply(self, engine: Engine, entity: Entity) -> None:
		dest_x = entity.x + self.xdir
		dest_y = entity.y + self.ydir

		target = engine.floor_map.get_entity_at(dest_x, dest_y)

		if not target:
			return

		print(f"You kicked the {target.name}, which did nothing")

class MoveAction(DirectionAction):
	def apply(self, engine: Engine, entity: Entity) -> None:
		dest_x = entity.x + self.xdir
		dest_y = entity.y + self.ydir

		if engine.floor_map.get_entity_at(dest_x, dest_y):
			return MeleeAction(self.xdir, self.ydir).apply(engine, entity)
		else:
			return MovementAction(self.xdir, self.ydir).apply(engine, entity)