Refactor rhythm action architecture

scenes/components/damage_receiver.gd

@@ -0,0 +1,23 @@
+class_name DamageReceiver
+extends Area2D
+
+signal damage_received(amount: int, hit_type: StringName, from: Vector2)
+
+
+func _ready() -> void:
+	add_to_group("damage_receivers")
+
+
+func take_damage(amount: int, hit_type: StringName, from: Vector2) -> void:
+	damage_received.emit(amount, hit_type, from)
+	_event_bus().emit_signal("damage_dealt", self, amount, hit_type)
+
+
+func _event_bus() -> Node:
+	var root := get_tree().root
+	var bus := root.get_node_or_null("EventBus")
+	if bus == null:
+		bus = load("res://autoload/event_bus.gd").new()
+		bus.name = "EventBus"
+		root.add_child(bus)
+	return bus