from __future__ import annotations

from typing import TYPE_CHECKING

if TYPE_CHECKING:
	from engine import Engine
	from entity import Entity

class Action: #lawsuit?
	def perform(self, engine: Engine, entity: Entity) -> None:
		"Oh look, the visitor pattern!"
		raise NotImplementedError()


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


class MovementAction(Action):
	def __init__(self, dx: int, dy: int):
		super().__init__()

		self.dx = dx
		self.dy = dy

	def perform(self, engine: Engine, entity: Entity) -> None:
		dest_x = entity.x + self.dx
		dest_y = entity.y + self.dy

		if not engine.game_map.in_bounds(dest_x, dest_y):
			return
		if not engine.game_map.tiles["walkable"][dest_x, dest_y]:
			return
		
		entity.set_pos(dest_x, dest_y)