[gd_scene format=3 uid="uid://difktsmww6qlh"]

[sub_resource type="GDScript" id="GDScript_mjcif"]
resource_name = "AGUIContainer"
script/source = "@tool
extends Node3D

## Number of items per row (X-axis)
@export var columns: int = 2:
	set(value):
		columns = max(1, value)
		_sort_3d_children()

## Number of rows per layer (Z-axis)
@export var rows: int = 2:
	set(value):
		rows = max(1, value)
		_sort_3d_children()

## Spacing between 3D objects in units
@export var cell_size: Vector3 = Vector3(2.0, 2.0, 2.0):
	set(value):
		cell_size = value
		_sort_3d_children()

func _ready():
	_sort_3d_children()
	child_order_changed.connect(_sort_3d_children)

func _sort_3d_children():
	# 1. First pass: Gather valid Node3D children
	var 3d_children: Array[Node3D] = []
	for child in get_children():
		if child is Node3D:
			3d_children.append(child)
			
	var total_items = 3d_children.size()
	if total_items == 0:
		return

	var items_per_layer = columns * rows

	# 2. Calculate the actual dimensions used by the current number of items
	# We use max(1, ...) to avoid multiplying by 0 if there's only 1 item
	var active_columns = min(total_items, columns)
	var active_rows = min(ceil(float(total_items) / columns), rows)
	var active_layers = ceil(float(total_items) / items_per_layer)

	# 3. Calculate the center offset
	# (Total dimensions - 1) * cell_size / 2 gives us the exact mid-point
	var offset = Vector3(
		(active_columns - 1) * cell_size.x,
		(active_layers - 1) * cell_size.y,
		(active_rows - 1) * cell_size.z
	) * 0.5

	# 4. Second pass: Position children and subtract the offset
	for index in range(total_items):
		var layer = index / items_per_layer
		var index_in_layer = index % items_per_layer
		var col = index_in_layer % columns
		var row = index_in_layer / columns
		
		var local_pos = Vector3(
			col * cell_size.x,
			layer * cell_size.y,
			row * cell_size.z
		)
		
		# Center the position relative to the parent Node3D's origin
		3d_children[index].position = local_pos - offset
"

[node name="AguiGridContainer" type="Node3D" unique_id=1053523827]
script = SubResource("GDScript_mjcif")
columns = null
rows = null
cell_size = null