[Tool]
public partial class TerrainEditingControls
	: VBoxContainer
{
	public (ToolMode , Button)[] ToolModeButtons     { get; private set; }
	public (ToolShape, Button)[] ToolShapeButtons    { get; private set; }
	public Button[]              PaintTextureButtons { get; private set; }

	public Slider DrawSizeSlider { get; private set; }

	ToolMode  _toolMode;
	ToolShape _toolShape;
	int       _texture;

	public ToolMode  ToolMode  { get => _toolMode ; set => SetToolMode (value); }
	public ToolShape ToolShape { get => _toolShape; set => SetToolShape(value); }
	public int       Texture   { get => _texture  ; set => SetTexture  (value); }

	public int DrawSize {
		get => RoundToInt(-DrawSizeSlider?.Value ?? 1);
		set => DrawSizeSlider.Value = -value;
	}

	public override void _Ready()
	{
		ToolModeButtons = [
			(ToolMode.Height, GetNode<Button>("Height")),
			(ToolMode.Paint , GetNode<Button>("Paint" )),
		];

		ToolShapeButtons = [
			(ToolShape.Corner, GetNode<Button>("Corner")),
			(ToolShape.Circle, GetNode<Button>("Circle")),
			(ToolShape.Square, GetNode<Button>("Square")),
		];

		PaintTextureButtons = [
			GetNode<Button>("Grass"),
			GetNode<Button>("Dirt"),
			GetNode<Button>("Rock"),
			GetNode<Button>("Sand"),
		];

		foreach (var (mode, button) in ToolModeButtons)
			button.Pressed += () => SetToolMode(mode);
		foreach (var (shape, button) in ToolShapeButtons)
			button.Pressed += () => SetToolShape(shape);
		foreach (var (i, button) in PaintTextureButtons.Select((b, i) => (i, b)))
			button.Pressed += () => SetTexture(i + 1);

		var drawSizeLabel = GetNode<Label>("SizeLabel");
		DrawSizeSlider = GetNode<Slider>("SizeSlider");
		DrawSizeSlider.ValueChanged += (_) => drawSizeLabel.Text = $"{DrawSize}";

		SetToolMode(ToolMode.Height);
		SetToolShape(ToolShape.Circle);
		SetTexture(1);

		OnEditingReady();
	}


	void SetToolMode(ToolMode value)
	{
		foreach (var (mode, button) in ToolModeButtons)
			button.Flat = button.ButtonPressed = value != mode;
		foreach (var button in PaintTextureButtons)
			button.Disabled = value != ToolMode.Paint;
		_toolMode = value;
	}

	void SetToolShape(ToolShape value)
	{
		foreach (var (shape, button) in ToolShapeButtons)
			button.Flat = button.ButtonPressed = value != shape;
		DrawSizeSlider.Editable = value != ToolShape.Corner;
		_toolShape = value;
	}

	void SetTexture(int value)
	{
		if ((value < 1) || (value > PaintTextureButtons.Length))
			throw new ArgumentOutOfRangeException(nameof(value));
		foreach (var (i, button) in PaintTextureButtons.Select((b, i) => (i, b)))
			button.Flat = button.ButtonPressed = value != i + 1;
		_texture = value;
	}
}

public enum ToolMode
{
	Height,
	Paint,
}

public enum ToolShape
{
	Corner,
	Circle,
	Square,
}