using System;
using Sandbox;

namespace Editor.SubTerrain;

/// <summary>
/// Sidebar readout for cursor height and brush footprint.
/// </summary>
internal class SubTerrainStatusWidget : Widget
{
	readonly SubTerrainTool _tool;
	Label _heightLabel;
	Label _normalizedLabel;
	Label _texelLabel;
	Label _spanLabel;

	public SubTerrainStatusWidget( SubTerrainTool tool, Widget parent ) : base( parent )
	{
		_tool = tool;
		Layout = Layout.Column();
		Layout.Spacing = 2;

		_heightLabel = Layout.Add( new Label( "Height: —" ) );
		_normalizedLabel = Layout.Add( new Label( "Normalized: —" ) );
		_texelLabel = Layout.Add( new Label( "Brush texels: —" ) );
		_spanLabel = Layout.Add( new Label( "Brush span: —" ) );
	}

	[EditorEvent.Frame]
	public void Refresh()
	{
		if ( !_tool.StatusValid || !_tool.StatusTerrain.IsValid() )
		{
			_heightLabel.Text = "Height: —";
			_normalizedLabel.Text = "Normalized: —";
			_texelLabel.Text = "Brush texels: —";
			_spanLabel.Text = "Brush span: —";
			return;
		}

		var storage = _tool.StatusTerrain.Storage;
		var z = _tool.StatusHitLocal.z;
		var texels = (int)Math.Floor( _tool.BrushSettings.Size / storage.TerrainSize * storage.Resolution );

		_heightLabel.Text = $"Height: {z:0.##}";
		_normalizedLabel.Text = $"Normalized: {(z / storage.TerrainHeight):0.####}";
		_texelLabel.Text = $"Brush texels: {Math.Max( texels, 1 )}";
		_spanLabel.Text = $"Brush span: {_tool.BrushSettings.Size} u";
	}
}