class_name InventoryUi extends Control

const INVENTORY_SLOT = preload("res://gui/pause/inventory/inventory_slot.tscn")

@export var data: InventoryData

var focus_index := 1

func _ready() -> void:
	PauseMenu.shown.connect(update)
	PauseMenu.hidden.connect(clear)
	clear()
	data.changed.connect(on_inventory_changed)

func clear() -> void:
	for child in get_children():
		child.queue_free()
	
func update() -> void:
	for slot in data.slots:
		var new_slot = INVENTORY_SLOT.instantiate()
		add_child(new_slot)
		new_slot.slot_data = slot
		new_slot.focus_entered.connect(on_item_focused)
	if !data.slots.is_empty():
		await get_tree().process_frame
		get_child(focus_index).grab_focus()

func on_inventory_changed() -> void:
	clear()
	update()

func on_item_focused() -> void:
	for child_index in get_child_count():
		if get_child(child_index).has_focus():
			focus_index = child_index
			return