namespace Yw.WpfUI.Hydro
{
    /// <summary>
    /// 抽象引线标签辅助类
    /// </summary>
    internal class LogicalBillboardLeadLabelHelper
    {
        /// <summary>
        /// 
        /// </summary>
        public LogicalBillboardLeadLabelHelper(HelixViewport3D viewport)
        {
            _viewport = viewport;
        }

        private readonly HelixViewport3D _viewport = null;//三维组件
        private readonly double _fontSize = 12;//字体大小
        private readonly Brush _foregroud = Brushes.Black;//前景色
        private readonly Brush _background = Brushes.Transparent;//背景色
        private readonly Brush _borderbrush = Brushes.Transparent;//边框色
        private readonly Dictionary<string, BillboardTextVisual3D> _cache = new();//缓存

        /// <summary>
        /// 设置
        /// </summary>
        public void Set(List<LogicalTextL3d> items)
        {
            Clear();
            items?.ForEach(x => AddTextVisual3D(x));
        }

        /// <summary>
        /// 清理
        /// </summary>
        public void Clear()
        {
            if (_cache.Count > 0)
            {
                foreach (var item in _cache)
                {
                    _viewport.Children.Remove(item.Value);
                }
                _cache.Clear();
            }
        }

        /// <summary>
        /// 更新
        /// </summary>
        public void Update(LogicalTextL3d item)
        {
            if (item == null)
            {
                return;
            }
            if (_cache.ContainsKey(item.Id))
            {
                var billboardText = _cache[item.Id];
                if (billboardText != null)
                {
                    billboardText.Text = item.Text;
                }
            }
            else
            {
                AddTextVisual3D(item);
            }
        }

        /// <summary>
        /// 更新
        /// </summary>
        public void Update(List<LogicalTextL3d> items)
        {
            items?.ForEach(x => Update(x));
        }


        //添加公告牌文本
        private void AddTextVisual3D(LogicalTextL3d item)
        {
            if (!_cache.ContainsKey(item.Id))
            {
                var billboardText = CreateTextVisual3D(item);
                if (billboardText != null)
                {
                    _cache.Add(item.Id, billboardText);
                    _viewport.Children.Add(billboardText);
                }
            }
        }

        //创建公告牌文本
        private BillboardTextVisual3D CreateTextVisual3D(LogicalTextL3d item)
        {
            if (item == null)
            {
                return default;
            }
            var logicalVisual = _viewport.Children.OfType<LogicalVisual3D>()
                .Where(x => x.Vmo.Id == item.Id).FirstOrDefault();
            if (logicalVisual == null)
            {
                return default;
            }

            var bounds = Visual3DHelper.FindBounds(logicalVisual, Transform3D.Identity);
            var position = bounds.GetCenter();

            var billboardText = new BillboardTextVisual3D();
            billboardText.Text = item.Text;
            billboardText.Foreground = _foregroud;
            billboardText.Background = _background;
            billboardText.BorderBrush = _borderbrush;
            billboardText.FontSize = _fontSize;
            billboardText.Padding = new Thickness(2);
            billboardText.Position = position;
            billboardText.HorizontalAlignment = HorizontalAlignment.Left;
            billboardText.VerticalAlignment = VerticalAlignment.Bottom;

            return billboardText;
        }







    }
}