from engine import Engine

from entity import Entity

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

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

class MoveAction(Action):
	def __init__(self, entity: Entity, xdir: int, ydir: int):
		super().__init__()
		self.entity = entity
		self.xdir = xdir
		self.ydir = ydir

	def apply(self, engine: Engine) -> None:
		x = self.entity.x + self.xdir
		y = self.entity.y + self.ydir

		#TODO: bounds checks

		self.entity.set_pos(x, y)