starcheese/asteroid.gd

extends StaticBody2D

@export var max_health: float = 100.0
var current_health: float
var is_destroyed: bool = false
var event_bus: EventBus

func _ready():
	current_health = max_health
	event_bus = get_node("/root/Main/MainEventBus")
	event_bus.subscribe_to(get_node("/root/Main/DamageEventScope"), "DamageEvent", Callable(self, "on_damage_event"))
	add_to_group("asteroids")
	update_health_label()

func on_damage_event(event: DamageEvent) -> EventResult.ResultType:
	if event.target != self or is_destroyed:
		return EventResult.ResultType.KEEP_SUBSCRIPTION
	
	apply_damage(event.damage_value)
	
	if current_health <= 0.0:
		emit_asteroid_destroyed()
		return EventResult.ResultType.DISPOSE_SUBSCRIPTION
	
	return EventResult.ResultType.KEEP_SUBSCRIPTION

func apply_damage(damage: float) -> void:
	current_health = max(current_health - damage, 0)
	update_health_label()

func emit_asteroid_destroyed() -> void:
	is_destroyed = true
	queue_free()
	publish_destroyed_event()

func publish_destroyed_event() -> void:
	var destroyed_event = DestroyedEvent.new(self, "asteroid", global_position, "laser")
	event_bus.publish(get_node("/root/Main/DestroyedEventScope"), destroyed_event)

func update_health_label() -> void:
	$AsteroidHealthLabel.text = str(round(current_health)) + " / " + str(max_health)