using netDxf.Entities;
using OxyPlot;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using WpfLine = System.Windows.Shapes.Line;
using DxfLine = netDxf.Entities.Line;
using DxfLwPolyline = netDxf.Entities.Polyline2D;
using Microsoft.Win32;
using System.Drawing;

namespace TeamAAS_VP.DxfModule
{
    /// <summary>
    /// DxfView.xaml 的交互逻辑
    /// </summary>
    public partial class DxfView : UserControl
    {
        private DxfParserService _dxfParser;
        private InteractionController _interactionController;
        private double _currentScale = 1.0;
        private double _zoomFactor = 1.2;

        public DxfView()
        {
            InitializeComponent();
            _dxfParser = new DxfParserService();
            InitializeInteractionController();
        }

        /// <summary>
        /// 选中的点位
        /// </summary>
        public List<PointF> Points { get; private set; }=new List<PointF>();

        /// <summary>
        /// 需要导入的点位表开始点编号
        /// </summary>
        public int StartIndex { get;private set; } = 1;


        private void InitializeInteractionController()
        {
            _interactionController = new InteractionController(DrawingCanvas);
            _interactionController.SelectionChanged += OnSelectionChanged;
        }

        private void BtnLoadDxf_Click(object sender, RoutedEventArgs e)
        {
            var openFileDialog = new OpenFileDialog
            {
                Filter = "DXF文件 (*.dxf)|*.dxf|所有文件 (*.*)|*.*",
                Title = "选择DXF文件"
            };

            if (openFileDialog.ShowDialog() == true)
            {
                LoadDxfFile(openFileDialog.FileName);
            }
        }

        private void LoadDxfFile(string filePath)
        {
            TxtStatus.Text = "正在加载DXF文件...";

            DrawingCanvas.Children.Clear();
            _interactionController?.ClearSelection();

            if (_dxfParser.LoadDxfFile(filePath))
            {
                var entities = _dxfParser.GetAllEntities();
                TxtStatus.Text = $"成功加载: {System.IO.Path.GetFileName(filePath)}";
                TxtEntityCount.Text = $"实体数: {entities.Count}";

                // Calculate bounds and scale
                var bounds = _dxfParser.GetBounds();
                double boundsWidth = bounds.maxX - bounds.minX;
                double boundsHeight = bounds.maxY - bounds.minY;

                if (boundsWidth > 0 && boundsHeight > 0)
                {
                    double scaleX = (DrawingCanvas.Width * 0.8) / boundsWidth;
                    double scaleY = (DrawingCanvas.Height * 0.8) / boundsHeight;
                    _currentScale = Math.Min(scaleX, scaleY);
                }

                // Render entities
                foreach (var entity in entities)
                {
                    var renderedElements = GraphicsRenderer.RenderEntity(entity, _currentScale);
                    foreach (var element in renderedElements)
                    {
                        DrawingCanvas.Children.Add(element);
                    }
                }

                // Center the drawing
                CenterDrawing(bounds);

                // Update statistics
                UpdateStatistics();
            }
            else
            {
                TxtStatus.Text = "加载DXF文件失败";
                MessageBox.Show("无法加载DXF文件，请检查文件是否有效。", "错误", MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }

        private void CenterDrawing((double minX, double minY, double maxX, double maxY) bounds)
        {
            double centerX = (bounds.minX + bounds.maxX) / 2 * _currentScale;
            double centerY = -(bounds.minY + bounds.maxY) / 2 * _currentScale;

            double offsetX = DrawingCanvas.Width / 2 - centerX;
            double offsetY = DrawingCanvas.Height / 2 - centerY;

            // Translate all elements
            foreach (UIElement element in DrawingCanvas.Children)
            {
                if (element is WpfLine line)
                {
                    line.X1 += offsetX;
                    line.X2 += offsetX;
                    line.Y1 += offsetY;
                    line.Y2 += offsetY;
                }
                else if (element is FrameworkElement fe)
                {
                    double left = Canvas.GetLeft(fe);
                    double top = Canvas.GetTop(fe);
                    Canvas.SetLeft(fe, left + offsetX);
                    Canvas.SetTop(fe, top + offsetY);
                }
            }
        }

        private void UpdateStatistics()
        {
            var stats = _dxfParser.GetEntityStatistics();
            var sb = new StringBuilder();

            foreach (var stat in stats.OrderByDescending(s => s.Value))
            {
                if (stat.Value > 0)
                {
                    sb.AppendLine($"{stat.Key}: {stat.Value}");
                }
            }

            TxtStatistics.Text = sb.ToString();
        }

        private void OnSelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            TxtSelectedCount.Text = $"选中: {e.SelectedEntities.Count}";

            var sb = new StringBuilder();

            if (e.SelectedEntities.Count > 0)
            {
                sb.AppendLine($"已选择 {e.SelectedEntities.Count} 个图形实体:\n");

                var grouped = e.SelectedEntities.GroupBy(entity => entity.Type.ToString());

                foreach (var group in grouped)
                {
                    sb.AppendLine($"{group.Key}: {group.Count()}");
                }

                sb.AppendLine("\n详细信息:");

                int index = 1;
                foreach (var entity in e.SelectedEntities.Take(10))
                {
                    sb.AppendLine($"\n[{index}] {GetEntityInfo(entity)}");
                    index++;
                }

                if (e.SelectedEntities.Count > 10)
                {
                    sb.AppendLine($"\n... 还有 {e.SelectedEntities.Count - 10} 个实体");
                }

                //如果选中的是圆，则输出圆心坐标,如果是直线，则输出中心点坐标，如果是矩形，则输出中心点坐标,如果是点，则输出点坐标,如果是圆弧，则输出中心点坐标
                if (Points!=null)
                {
                    Points = new List<PointF>();
                }
                Points.Clear();
                foreach (var item in e.SelectedEntities)
                {
                    if (item is Circle circle)
                    {
                        Points.Add(new PointF((float)circle.Center.X, (float)circle.Center.Y));
                    }
                    else if (item is DxfLine line)
                    {
                        float centerX = (float)((line.StartPoint.X + line.EndPoint.X) / 2);
                        float centerY = (float)((line.StartPoint.Y + line.EndPoint.Y) / 2);
                        Points.Add(new PointF(centerX, centerY));
                    }
                    else if (item is DxfLwPolyline polyline && polyline.IsClosed)
                    {
                        //计算多边形中心点
                        float centerX = 0;
                        float centerY = 0;
                        foreach (var vertex in polyline.Vertexes)
                        {
                            centerX += (float)vertex.Position.X;
                            centerY += (float)vertex.Position.Y;
                        }
                        centerX /= polyline.Vertexes.Count;
                        centerY /= polyline.Vertexes.Count;
                        Points.Add(new PointF(centerX, centerY));
                    }
                    else if (item is  netDxf.Entities.Point point)
                    {
                        Points.Add(new PointF((float)point.Position.X, (float)point.Position.Y));
                    }
                    else if (item is Arc arc)
                    {
                        Points.Add(new PointF((float)arc.Center.X, (float)arc.Center.Y));
                    }
                }
            }
            else
            {
                sb.AppendLine("未选择任何图形");
            }

            TxtSelectedInfo.Text = sb.ToString();
        }

        private string GetEntityInfo(EntityObject entity)
        {
            switch (entity)
            {
                case DxfLine line:
                    return $"直线: ({line.StartPoint.X:F2}, {line.StartPoint.Y:F2}) → ({line.EndPoint.X:F2}, {line.EndPoint.Y:F2})";
                case Circle circle:
                    return $"圆: 中心({circle.Center.X:F2}, {circle.Center.Y:F2}), 半径={circle.Radius:F2}";
                case Arc arc:
                    return $"圆弧: 中心({arc.Center.X:F2}, {arc.Center.Y:F2}), 半径={arc.Radius:F2}, 角度={arc.StartAngle:F1}°~{arc.EndAngle:F1}°";
                case Text text:
                    return $"文本: \"{text.Value}\" 位置({text.Position.X:F2}, {text.Position.Y:F2})";
                case MText mtext:
                    return $"多行文本: \"{mtext.Value}\" 位置({mtext.Position.X:F2}, {mtext.Position.Y:F2})";
                case DxfLwPolyline lwPoly:
                    return $"轻量多段线: {lwPoly.Vertexes.Count} 个顶点{(lwPoly.IsClosed ? " (闭合)" : "")}";
                case Spline spline:
                // return $"样条曲线: {spline.ControlPoints.Count} 个控制点";
                default:
                    return $"{entity.Type}: {entity.CodeName}";
            }
        }

        private void BtnClearSelection_Click(object sender, RoutedEventArgs e)
        {
            Points?.Clear();
            _interactionController?.ClearSelection();
        }

        private void BtnExtractSelected_Click(object sender, RoutedEventArgs e)
        {
            var selectedEntities = _interactionController?.GetSelectedEntities();

            if (selectedEntities == null || selectedEntities.Count == 0)
            {
                MessageBox.Show("请先选择要提取的图形。", "提示", MessageBoxButton.OK, MessageBoxImage.Information);
                return;
            }

            var sb = new StringBuilder();
            sb.AppendLine($"提取的图形信息 (共 {selectedEntities.Count} 个):\n");

            var grouped = selectedEntities.GroupBy(p => p.Type.ToString());
            foreach (var group in grouped)
            {
                sb.AppendLine($"\n{group.Key} ({group.Count()} 个):");
                sb.AppendLine(new string('-', 50));

                foreach (var entity in group)
                {
                    sb.AppendLine(GetEntityInfo(entity));
                }
            }

            MessageBox.Show(sb.ToString(), "提取的图形信息", MessageBoxButton.OK, MessageBoxImage.Information);
        }

        private void BtnZoomIn_Click(object sender, RoutedEventArgs e)
        {
            // Smooth zoom centered at viewport center
            var sv = ScrollViewer;
            if (sv != null)
            {
                double prevScale = CanvasScaleTransform.ScaleX;
                double target = prevScale * _zoomFactor;
                target = Math.Max(0.05, Math.Min(target, 50.0));
                AnimateScale(target, null);
            }
            else
            {
                Zoom(_zoomFactor);
            }
        }

        private void BtnZoomOut_Click(object sender, RoutedEventArgs e)
        {
            var sv = ScrollViewer;
            if (sv != null)
            {
                double prevScale = CanvasScaleTransform.ScaleX;
                double target = prevScale / _zoomFactor;
                target = Math.Max(0.05, Math.Min(target, 50.0));
                AnimateScale(target, null);
            }
            else
            {
                Zoom(1.0 / _zoomFactor);
            }
        }

        private void BtnFitToScreen_Click(object sender, RoutedEventArgs e)
        {
            var sv = ScrollViewer;
            if (sv == null)
            {
                CanvasScaleTransform.ScaleX = 1.0;
                CanvasScaleTransform.ScaleY = 1.0;
                UpdateZoomDisplay();
                return;
            }

            // Compute scale to fit the canvas into viewport with some margin
            double marginFactor = 0.95;
            double targetScaleX = (sv.ViewportWidth * marginFactor) / DrawingCanvas.Width;
            double targetScaleY = (sv.ViewportHeight * marginFactor) / DrawingCanvas.Height;
            double target = Math.Min(targetScaleX, targetScaleY);
            if (double.IsNaN(target) || target <= 0)
                target = 1.0;

            target = Math.Max(0.05, Math.Min(target, 50.0));

            // Animate to target and center
            AnimateScale(target, null);
        }

        private void DrawingCanvas_MouseWheel(object sender, MouseWheelEventArgs e)
        {
            // Zoom centered at current mouse position inside the ScrollViewer viewport
            var sv = ScrollViewer;
            if (sv == null) // fallback to previous behavior
            {
                double zoom1 = e.Delta > 0 ? _zoomFactor : 1.0 / _zoomFactor;
                Zoom(zoom1);
                return;
            }

            // Mouse position relative to the ScrollViewer (viewport)
            System.Windows.Point mousePosInViewport = e.GetPosition(sv);
            // Mouse position relative to the content (unscaled content coordinates)
            System.Windows.Point mousePosInContent = e.GetPosition(DrawingCanvas);

            double prevScale = CanvasScaleTransform.ScaleX;
            double zoom = e.Delta > 0 ? _zoomFactor : 1.0 / _zoomFactor;
            double newScale = prevScale * zoom;

            // Clamp scale to reasonable range
            newScale = Math.Max(0.05, Math.Min(newScale, 50.0));

            // Absolute position of the content point after scaling
            double absX = mousePosInContent.X * newScale;
            double absY = mousePosInContent.Y * newScale;

            // Apply scale
            CanvasScaleTransform.ScaleX = newScale;
            CanvasScaleTransform.ScaleY = newScale;

            // Ensure layout updated so ScrollViewer extents are refreshed
            sv.UpdateLayout();

            // Calculate target offsets so that the content point stays under the mouse cursor
            double targetOffsetX = absX - mousePosInViewport.X;
            double targetOffsetY = absY - mousePosInViewport.Y;

            // Clamp offsets to valid scrollable range
            double maxOffsetX = Math.Max(0, sv.ExtentWidth - sv.ViewportWidth);
            double maxOffsetY = Math.Max(0, sv.ExtentHeight - sv.ViewportHeight);

            targetOffsetX = Math.Max(0, Math.Min(targetOffsetX, maxOffsetX));
            targetOffsetY = Math.Max(0, Math.Min(targetOffsetY, maxOffsetY));

            sv.ScrollToHorizontalOffset(targetOffsetX);
            sv.ScrollToVerticalOffset(targetOffsetY);

            UpdateZoomDisplay();
            e.Handled = true;
        }

        /// <summary>
        /// Animate scale transform to targetScale. If anchorInContent is null, use viewport center as anchor.
        /// anchorInContent, when provided, is in unscaled canvas coordinates (content space).
        /// </summary>
        private void AnimateScale(double targetScale, System.Windows.Point? anchorInContent)
        {
            var sv = ScrollViewer;
            if (sv == null)
            {
                CanvasScaleTransform.ScaleX = targetScale;
                CanvasScaleTransform.ScaleY = targetScale;
                UpdateZoomDisplay();
                return;
            }

            double prevScale = CanvasScaleTransform.ScaleX;
            if (Math.Abs(prevScale - targetScale) < 1e-6)
                return;

            // Determine anchor in content space and its position in viewport
            System.Windows.Point anchorContent;
            System.Windows.Point anchorViewport;

            if (anchorInContent.HasValue)
            {
                anchorContent = anchorInContent.Value;
                anchorViewport = new System.Windows.Point(anchorContent.X * prevScale - sv.HorizontalOffset, anchorContent.Y * prevScale - sv.VerticalOffset);
            }
            else
            {
                // use viewport center
                anchorViewport = new System.Windows.Point(sv.ViewportWidth / 2.0, sv.ViewportHeight / 2.0);
                anchorContent = new System.Windows.Point((sv.HorizontalOffset + anchorViewport.X) / prevScale, (sv.VerticalOffset + anchorViewport.Y) / prevScale);
            }

            // Calculate target offsets so that the anchor stays in the same viewport position after scaling
            double targetOffsetX = anchorContent.X * targetScale - anchorViewport.X;
            double targetOffsetY = anchorContent.Y * targetScale - anchorViewport.Y;

            double maxOffsetX = Math.Max(0, sv.ExtentWidth - sv.ViewportWidth);
            double maxOffsetY = Math.Max(0, sv.ExtentHeight - sv.ViewportHeight);

            targetOffsetX = Math.Max(0, Math.Min(targetOffsetX, maxOffsetX));
            targetOffsetY = Math.Max(0, Math.Min(targetOffsetY, maxOffsetY));

            var duration = TimeSpan.FromMilliseconds(200);

            var animX = new DoubleAnimation(prevScale, targetScale, duration, FillBehavior.Stop) { EasingFunction = new QuadraticEase() };
            var animY = new DoubleAnimation(prevScale, targetScale, duration, FillBehavior.Stop) { EasingFunction = new QuadraticEase() };

            int completed = 0;
            EventHandler whenDone = (s, e) =>
            {
                completed++;
                if (completed >= 2)
                {
                    // Ensure final values
                    CanvasScaleTransform.ScaleX = targetScale;
                    CanvasScaleTransform.ScaleY = targetScale;

                    // Update layout so extents reflect final scale
                    sv.UpdateLayout();

                    // Recalculate clamped offsets based on final extents
                    double maxX = Math.Max(0, sv.ExtentWidth - sv.ViewportWidth);
                    double maxY = Math.Max(0, sv.ExtentHeight - sv.ViewportHeight);

                    double finalOffsetX = Math.Max(0, Math.Min(targetOffsetX, maxX));
                    double finalOffsetY = Math.Max(0, Math.Min(targetOffsetY, maxY));

                    sv.ScrollToHorizontalOffset(finalOffsetX);
                    sv.ScrollToVerticalOffset(finalOffsetY);

                    UpdateZoomDisplay();
                }
            };

            animX.Completed += whenDone;
            animY.Completed += whenDone;

            CanvasScaleTransform.BeginAnimation(ScaleTransform.ScaleXProperty, animX);
            CanvasScaleTransform.BeginAnimation(ScaleTransform.ScaleYProperty, animY);
        }

        private void Zoom(double factor)
        {
            CanvasScaleTransform.ScaleX *= factor;
            CanvasScaleTransform.ScaleY *= factor;
            UpdateZoomDisplay();
        }

        private void UpdateZoomDisplay()
        {
            TxtZoom.Text = $"缩放: {CanvasScaleTransform.ScaleX * 100:F0}%";
        }

        private void TxtStartIndex_ValueChanged(object sender, RoutedPropertyChangedEventArgs<int> e)
        {
            StartIndex= e.NewValue;
        }
    }
}