class_name EnergyComponent
extends Node

signal energy_changed(current: int, maximum: int)

@export var maximum := 10
@export var current := 0


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 set_current(next_current: int) -> void:
	var clamped := clampi(next_current, 0, maximum)
	if clamped == current:
		return
	current = clamped
	_emit_changed()


func change(delta: int) -> void:
	set_current(current + delta)


func spend(cost: float) -> bool:
	var int_cost := int(ceil(cost))
	if int_cost <= 0:
		return true
	if current < int_cost:
		return false
	set_current(current - int_cost)
	return true


func _emit_changed() -> void:
	energy_changed.emit(current, maximum)
	_event_bus().emit_signal("player_energy_changed", float(current), float(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