Refactor rhythm action architecture

scenes/rhythm/rhythm_conductor.gd

@@ -27,6 +27,8 @@ signal action_judged(action_name: String, rating: Dictionary)
 func _ready() -> void:
 	add_to_group("rhythm_conductor")
 	sec_per_beat = 60.0 / bpm
+	if is_inside_tree():
+		_event_bus().connect("rhythm_action_requested", _on_rhythm_action_requested)
 	if starts_on_ready:
 		start()
 
@@ -72,11 +74,9 @@ func judge_action(action_name: String) -> Dictionary:
 	var rating := get_current_rating()
 	rating["action"] = action_name
 	emit_signal("action_judged", action_name, rating)
-	print("Rhythm %s: %s (%s ms)" % [
-		action_name,
-		str(rating.get("label", "miss")),
-		_format_signed_ms(float(rating.get("diff", INF)))
-	])
+	var bus := _event_bus()
+	bus.emit_signal("judgement_made", StringName(str(rating.get("label", "miss"))), float(rating.get("diff", INF)) * 1000.0)
+	bus.emit_signal("action_judged", StringName(action_name), rating)
 	return rating
 
 
@@ -128,10 +128,25 @@ func _report_beat() -> void:
 			current_measure = 1
 		emit_signal("beat", song_position_in_beats)
 		emit_signal("measure", current_measure)
+		_event_bus().emit_signal("beat_ticked", song_position_in_beats)
 		last_reported_beat = song_position_in_beats
 		current_measure += 1
 
 
+func _on_rhythm_action_requested(action_name: StringName) -> void:
+	judge_action(str(action_name))
+
+
+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 _apply_beat_offset(time_seconds: float) -> float:
 	return time_seconds + beat_offset