Refactor rhythm action architecture

scenes/components/damage_emitter.gd

@@ -0,0 +1,47 @@
+class_name DamageEmitter
+extends Area2D
+
+@export var damage := 10
+@export var hit_type: StringName = &"normal"
+
+var action_context: Resource
+var judgement_context: Dictionary = {}
+
+
+func _ready() -> void:
+	area_entered.connect(_on_area_entered)
+
+
+func configure_hit(action: Resource, judgement: Dictionary) -> void:
+	action_context = action
+	judgement_context = judgement.duplicate()
+
+
+func _on_area_entered(receiver: Area2D) -> void:
+	if receiver.is_in_group("damage_receivers"):
+		var final_damage := _resolve_damage()
+		receiver.emit_signal("damage_received", final_damage, hit_type, global_position)
+		_event_bus().emit_signal("damage_dealt", receiver, final_damage, hit_type)
+
+
+func _resolve_damage() -> int:
+	var combat := _combat_manager_or_null()
+	if combat == null:
+		return damage
+	return int(round(combat.call("resolve_damage", float(damage), action_context, judgement_context, null, null)))
+
+
+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
+
+
+func _combat_manager_or_null() -> Node:
+	if not is_inside_tree():
+		return null
+	return get_tree().root.get_node_or_null("CombatManager")