Part 2.

actions.py

@@ -1,13 +1,42 @@
-class Action:
-    pass
+from __future__ import annotations
 
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from engine import Engine
+    from entity import Entity
+
+
+class Action:
+    def perform(self, engine: Engine, entity: Entity) -> None:
+        """Perform this action with the objects needed to determine its scope
+
+        'engine' is the scope this action is being perfrmed in.
+
+        'entity is the object performing the action.
+
+        This method must be overridden by Action subclasses
+        """
+        raise NotImplementedError()
 
 class EscapeAction(Action):
-    pass
+    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
+        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  # Destination is out of bounds.
+        if not engine.game_map.tiles["walkable"][dest_x, dest_y]:
+            return  # Destination is blocked by a tile
+
+        entity.move(self.dx, self.dy)