namespace Yw.WpfUI.Hydro
{
    /// <summary>
    /// 抽象网格线辅助类
    /// </summary>
    internal class LogicalGridLineHelper
    {
        /// <summary>
        /// 
        /// </summary>
        public LogicalGridLineHelper(HelixViewport3D viewport)
        {
            _viewport = viewport;
            _gridLines = CreateGridLinesVisual3D();
            _viewport.CameraChanged += Viewport_CameraChanged;
        }

        private readonly HelixViewport3D _viewport = null;//三维组件
        private readonly GridLinesVisual3D _gridLines = null;//网格线

        /// <summary>
        /// 显示网格线
        /// </summary>
        public void Show()
        {
            var gridLines = _viewport.Children.OfType<GridLinesVisual3D>().FirstOrDefault();
            if (gridLines == null)
            {
                _gridLines.Visible = true;
                _viewport.Children.Add(_gridLines);
                UpdateGridLinesVisual3D();
            }
            else
            {
                gridLines.Visible = true;
            }

        }

        /// <summary>
        /// 隐藏网格线
        /// </summary>
        public void Hide()
        {
            var gridLines = _viewport.Children.OfType<GridLinesVisual3D>().FirstOrDefault();
            if (gridLines != null)
            {
                gridLines.Visible = false;
            }
        }

        /// <summary>
        /// 可见性
        /// </summary>
        public bool Visible
        {
            get
            {
                var gridLines = _viewport.Children.OfType<GridLinesVisual3D>().FirstOrDefault();
                if (gridLines == null)
                {
                    return false;
                }
                if (!gridLines.Visible)
                {
                    return false;
                }
                return true;
            }
            set
            {
                if (value)
                {
                    Show();
                }
                else
                {
                    Hide();
                }
            }
        }


        //创建网格线
        private GridLinesVisual3D CreateGridLinesVisual3D()
        {
            var gridLines = new GridLinesVisual3D();
            gridLines.Thickness = 0.05;
            gridLines.MajorDistance = 5;
            gridLines.MinorDistance = 1;
            gridLines.Fill = Brushes.Black;
            return gridLines;
        }

        //相机改变
        private void Viewport_CameraChanged(object sender, RoutedEventArgs e)
        {
            UpdateGridLinesVisual3D();
        }

        // 更新网格大小的方法
        private void UpdateGridLinesVisual3D()
        {
            var gridLines = _viewport.Children.OfType<GridLinesVisual3D>().FirstOrDefault();
            if (gridLines == null)
            {
                return;
            }
            if (!gridLines.Visible)
            {
                return;
            }

            Rect3D bounds = Rect3D.Empty;
            foreach (Visual3D child in _viewport.Children.OfType<LogicalVisual3D>())
            {
                if (!(child is IBoundsIgnoredVisual3D))
                {
                    Rect3D rect = child.FindBounds(Transform3D.Identity);
                    bounds.Union(rect);
                }
            }

            if (!bounds.IsEmpty)
            {
                // 计算最大尺寸并增加20%边距
                double maxSize = Math.Max(bounds.SizeX,
                                        Math.Max(bounds.SizeY, bounds.SizeZ)) * 1.5;

                if (maxSize < 100)
                {
                    maxSize = 100;
                }

                // 设置网格大小
                gridLines.Width = maxSize;
                gridLines.Length = maxSize;

                // 保持网格居中
                gridLines.Center = new Point3D(
                    bounds.X + bounds.SizeX / 2,
                    bounds.Y + bounds.SizeY / 2,
                    0);

                // 根据尺寸自动调整网格密度
                gridLines.MinorDistance = Math.Max(1, maxSize / 20d);
                gridLines.MajorDistance = gridLines.MinorDistance * 5;
            }
            else
            {
                // 默认大小（当场景为空时）
                gridLines.Width = 100;
                gridLines.Length = 100;
                gridLines.Center = new Point3D(0, 0, 0);
            }

        }








    }
}