Refactor rhythm action architecture

scenes/components/health_component.gd

@@ -0,0 +1,49 @@
+class_name HealthComponent
+extends Node
+
+signal health_changed(current: int, maximum: int)
+signal depleted
+
+@export var maximum := 100
+@export var current := 100
+
+
+func _ready() -> void:
+	_emit_changed()
+
+
+func set_values(next_current: int, next_maximum: int) -> void:
+	maximum = max(1, next_maximum)
+	current = clampi(next_current, 0, maximum)
+	_emit_changed()
+
+
+func apply_damage(amount: int) -> void:
+	if amount <= 0:
+		return
+	current = clampi(current - amount, 0, maximum)
+	_emit_changed()
+	if current == 0:
+		depleted.emit()
+
+
+func heal(amount: int) -> void:
+	if amount <= 0:
+		return
+	current = clampi(current + amount, 0, maximum)
+	_emit_changed()
+
+
+func _emit_changed() -> void:
+	health_changed.emit(current, maximum)
+	_event_bus().emit_signal("player_health_changed", current, maximum)
+
+
+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