Add a behavior tree to the enemy

Add the Beehave addon.
Make the enemy do the same thing as before but with a behavior tree.

scripts/enemy.gd

@@ -4,33 +4,9 @@ extends CharacterBody2D
 @onready var animation_player = $AnimationPlayer
 @export var speed = 80
 var y_spawn_offset = -8
-var is_moving = false
 var destination: Vector2 = Vector2.ZERO
 
-
 func _ready():
 	var spawn_cell: Vector2i = tile_map.get_top_spawn_cell()
 	position = tile_map.map_to_local(spawn_cell)
 	position.y += y_spawn_offset
-
-func _process(_delta):
-	if is_moving:
-		animation_player.play("walk")
-	else:
-		animation_player.stop()
-
-func _physics_process(delta):
-	move_to_rand_cell(delta)
-
-func move_to_rand_cell(delta):
-	if !is_moving:
-		var rand_cell: Vector2i = tile_map.get_random_top_cell()
-		tile_map.set_cell(0, Vector2i(rand_cell.x, rand_cell.y), 1, Vector2i(0, 0), 0) # debug purpose
-		destination = tile_map.map_to_local(rand_cell)
-		destination.y += y_spawn_offset
-		
-		is_moving = true
-	position = position.move_toward(destination, delta * speed)
-	
-	if position == destination:
-		is_moving = false

scripts/get_random_top_cell.gd

@@ -0,0 +1,11 @@
+class_name GetRandomTopCell
+extends ActionLeaf
+
+func tick(actor, _blackboard):
+	var rand_cell: Vector2i = actor.tile_map.get_random_top_cell()
+	actor.tile_map.set_cell(0, Vector2i(rand_cell.x, rand_cell.y), 1, Vector2i(0, 0), 0) # debug purpose
+	
+	actor.destination = actor.tile_map.map_to_local(rand_cell)
+	actor.destination.y += actor.y_spawn_offset
+	
+	return SUCCESS

scripts/is_idle_condition.gd

@@ -0,0 +1,5 @@
+class_name IsIdleCondition
+extends ConditionLeaf
+
+func tick(actor, _blackboard):
+	return SUCCESS

scripts/move_to_target_action.gd

@@ -0,0 +1,16 @@
+class_name MoveToTargetAction
+extends ActionLeaf
+
+func before_run(actor, blackboard):
+	actor.animation_player.play("walk")
+
+func tick(actor, _blackboard):
+	var delta = get_physics_process_delta_time()
+	actor.position = actor.position.move_toward(actor.destination, delta * actor.speed)
+	
+	if actor.position == actor.destination:
+		return SUCCESS
+	return RUNNING
+
+func after_run(actor, blackboard):
+	actor.animation_player.stop()