class_name EnergyBar
extends HBoxContainer

@export var segment_count := 10

var segments: Array[Panel] = []


func _ready() -> void:
	_build_segments()
	_event_bus().connect("player_energy_changed", refresh)


func refresh(current: float, maximum: float) -> void:
	if segments.is_empty():
		_build_segments()
	var filled := clampi(int(round(current)), 0, min(segment_count, int(maximum)))
	for index: int in range(segments.size()):
		segments[index].modulate = Color(1.0, 1.0, 1.0, 1.0 if index < filled else 0.35)


func _build_segments() -> void:
	if not segments.is_empty():
		return
	for child: Node in get_children():
		var panel := child as Panel
		if panel != null:
			segments.append(panel)
	if segments.size() >= segment_count:
		return
	for index: int in range(segments.size(), segment_count):
		var panel := Panel.new()
		panel.custom_minimum_size = Vector2(23, 16)
		panel.modulate = Color(1.0, 1.0, 1.0, 0.35)
		panel.add_theme_stylebox_override("panel", _make_segment_style())
		add_child(panel)
		segments.append(panel)


func _make_segment_style() -> StyleBoxFlat:
	var style := StyleBoxFlat.new()
	style.bg_color = Color(0.18, 0.66, 0.95, 1.0)
	style.border_width_left = 1
	style.border_width_top = 1
	style.border_width_right = 1
	style.border_width_bottom = 1
	style.border_color = Color(0.66, 0.92, 1.0, 0.9)
	return style


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