using CSScripting;
using OpenCvSharp;
using OpenCvSharp.Extensions;
using OpenCvSharp.WpfExtensions;
using OxyPlot;
using OxyPlot.Axes;
using OxyPlot.Series;
using Prism.Commands;
using Prism.Mvvm;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Windows.Threading;
using TeamAAS_VP.Core;
using TeamAAS_VP.Enums;
using TeamAAS_VP.Models;
using TeamAAS_VP.ViewModels;
using TeamAAS_VP.ViewModels.DebugMod;

namespace TeamAAS_VP.Views.DebugMod
{
    public partial class FocusAnalyzer : UserControl
    {
        private FocusAnalyzerViewModel ViewModel ;

        private System.Windows.Point _startPoint;
        private System.Windows.Point _lastPoint;
        private bool _isDragging = false;
        private DragHandleType _currentHandle = DragHandleType.None;
        private double _originalAngle = 0;

        public FocusAnalyzer()
        {
            InitializeComponent();

            // 订阅鼠标事件
            RoiCanvas.MouseLeftButtonDown += RoiCanvas_MouseLeftButtonDown;
            RoiCanvas.MouseMove += RoiCanvas_MouseMove;
            RoiCanvas.MouseLeftButtonUp += RoiCanvas_MouseLeftButtonUp;

            // 当Canvas或Image大小变化时，重新映射ROI以保持与图像同步
            RoiCanvas.SizeChanged += RoiCanvas_SizeChanged;
            ImageDisplay.SizeChanged += RoiCanvas_SizeChanged;
            this.SizeChanged += RoiCanvas_SizeChanged;

            // 订阅ViewModel的ROI变化事件
            Loaded += FocusAnalyzerControl_Loaded;
        }

        private void FocusAnalyzerControl_Loaded(object sender, RoutedEventArgs e)
        {
            if(ViewModel==null)
                ViewModel = DataContext as FocusAnalyzerViewModel; ;

            if (ViewModel != null)
            {
                ViewModel.PropertyChanged += ViewModel_PropertyChanged;

                // 设置ROI到图像坐标的转换器
                ViewModel.RoiToImageRectConverter = ConvertRoiToImageRect;
            }
        }

        private void RoiCanvas_SizeChanged(object sender, SizeChangedEventArgs e)
        {
            // When the canvas or window resizes, remap existing ROI so it stays aligned to the same image area
            if (ViewModel == null || ViewModel.CurrentRoi == null || !ViewModel.CurrentRoi.IsValid)
                return;

            if (ViewModel.RoiToImageRectConverter == null)
                return;

            var imgRect = ViewModel.RoiToImageRectConverter(ViewModel.CurrentRoi);
            if (!imgRect.HasValue)
                return;

            // Convert image pixel rect back to canvas coordinates and update CurrentRoi
            var newRoi = ConvertImageRectToCanvasRoi(imgRect.Value);
            if (newRoi != null)
            {
                // Preserve angle
                double angle = ViewModel.CurrentRoi.Angle;
                ViewModel.CurrentRoi.X = newRoi.X;
                ViewModel.CurrentRoi.Y = newRoi.Y;
                ViewModel.CurrentRoi.Width = newRoi.Width;
                ViewModel.CurrentRoi.Height = newRoi.Height;
                ViewModel.CurrentRoi.Angle = angle;
            }
        }

        private TeamAAS_VP.Models.RoiModel ConvertImageRectToCanvasRoi(OpenCvSharp.Rect imgRect)
        {
            if (ViewModel?.CurrentImage == null)
                return null;

            var bmp = ViewModel.CurrentImage as System.Windows.Media.Imaging.BitmapSource;
            if (bmp == null || bmp.PixelWidth == 0 || bmp.PixelHeight == 0)
                return null;

            double canvasW = RoiCanvas.ActualWidth;
            double canvasH = RoiCanvas.ActualHeight;
            if (canvasW <= 0 || canvasH <= 0)
                return null;

            double imgPixelW = bmp.PixelWidth;
            double imgPixelH = bmp.PixelHeight;

            double imgRatio = imgPixelW / imgPixelH;
            double canvasRatio = canvasW / canvasH;

            double dispW, dispH;
            if (canvasRatio > imgRatio)
            {
                // canvas wider than image => fit height
                dispH = canvasH;
                dispW = dispH * imgRatio;
            }
            else
            {
                // fit width
                dispW = canvasW;
                dispH = dispW / imgRatio;
            }

            double offsetX = (canvasW - dispW) / 2.0;
            double offsetY = (canvasH - dispH) / 2.0;

            double scaleX = imgPixelW / dispW;
            double scaleY = imgPixelH / dispH;

            double canvasX = offsetX + imgRect.X / scaleX;
            double canvasY = offsetY + imgRect.Y / scaleY;
            double canvasWRect = imgRect.Width / scaleX;
            double canvasHRect = imgRect.Height / scaleY;

            return new TeamAAS_VP.Models.RoiModel
            {
                X = canvasX,
                Y = canvasY,
                Width = canvasWRect,
                Height = canvasHRect,
                Angle = 0
            };
        }

        private OpenCvSharp.Rect? ConvertRoiToImageRect(TeamAAS_VP.Models.RoiModel roi)
        {
            if (roi == null || !roi.IsValid || ViewModel?.CurrentImage == null)
                return null;

            try
            {
                var bmp = ViewModel.CurrentImage as System.Windows.Media.Imaging.BitmapSource;
                if (bmp == null || bmp.PixelWidth == 0 || bmp.PixelHeight == 0)
                    return null;

                double canvasW = RoiCanvas.ActualWidth;
                double canvasH = RoiCanvas.ActualHeight;
                if (canvasW <= 0 || canvasH <= 0)
                    return null;

                double imgPixelW = bmp.PixelWidth;
                double imgPixelH = bmp.PixelHeight;

                double imgRatio = imgPixelW / imgPixelH;
                double canvasRatio = canvasW / canvasH;

                double dispW, dispH;
                if (canvasRatio > imgRatio)
                {
                    // canvas wider than image => fit height
                    dispH = canvasH;
                    dispW = dispH * imgRatio;
                }
                else
                {
                    // fit width
                    dispW = canvasW;
                    dispH = dispW / imgRatio;
                }

                double offsetX = (canvasW - dispW) / 2.0;
                double offsetY = (canvasH - dispH) / 2.0;

                // ROI relative to displayed image area
                double rx = roi.X - offsetX;
                double ry = roi.Y - offsetY;

                // clamp to displayed image area
                if (rx + roi.Width <= 0 || ry + roi.Height <= 0)
                    return null;

                double clampedX = Math.Max(0, rx);
                double clampedY = Math.Max(0, ry);
                double clampedW = Math.Min(roi.Width - (clampedX - rx), dispW - clampedX);
                double clampedH = Math.Min(roi.Height - (clampedY - ry), dispH - clampedY);

                if (clampedW <= 0 || clampedH <= 0)
                    return null;

                double scaleX = imgPixelW / dispW;
                double scaleY = imgPixelH / dispH;

                int ix = (int)(clampedX * scaleX);
                int iy = (int)(clampedY * scaleY);
                int iw = Math.Max(1, (int)(clampedW * scaleX));
                int ih = Math.Max(1, (int)(clampedH * scaleY));

                // clamp to image bounds
                ix = Math.Max(0, Math.Min(ix, (int)imgPixelW - 1));
                iy = Math.Max(0, Math.Min(iy, (int)imgPixelH - 1));
                iw = Math.Min(iw, (int)imgPixelW - ix);
                ih = Math.Min(ih, (int)imgPixelH - iy);

                return new OpenCvSharp.Rect(ix, iy, iw, ih);
            }
            catch
            {
                return null;
            }
        }

        private void ViewModel_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
            if (e.PropertyName == nameof(ViewModel.CurrentRoi))
            {
                UpdateRoiVisual();
            }
        }

        private void RoiCanvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (ViewModel?.CurrentImage == null)
                return;

            _startPoint = e.GetPosition(RoiCanvas);
            _lastPoint = _startPoint;
            _isDragging = true;

            // 检测点击的是哪个控制点
            _currentHandle = GetHandleAtPoint(_startPoint);

            if (_currentHandle == DragHandleType.None && ViewModel.RoiMode == RoiOperationMode.Draw)
            {
                // 开始绘制新的ROI
                ViewModel.CurrentRoi.X = _startPoint.X;
                ViewModel.CurrentRoi.Y = _startPoint.Y;
                ViewModel.CurrentRoi.Width = 0;
                ViewModel.CurrentRoi.Height = 0;
                ViewModel.CurrentRoi.Angle = 0;
            }
            else if (_currentHandle == DragHandleType.Rotate)
            {
                _originalAngle = ViewModel.CurrentRoi.Angle;
            }

            RoiCanvas.CaptureMouse();
        }

        private void RoiCanvas_MouseMove(object sender, MouseEventArgs e)
        {
            if (!_isDragging || ViewModel?.CurrentImage == null)
                return;

            System.Windows.Point currentPoint = e.GetPosition(RoiCanvas);
            double deltaX = currentPoint.X - _lastPoint.X;
            double deltaY = currentPoint.Y - _lastPoint.Y;

            var roi = ViewModel.CurrentRoi;

            switch (ViewModel.RoiMode)
            {
                case RoiOperationMode.Draw:
                    // 绘制模式
                    if (_currentHandle == DragHandleType.None)
                    {
                        roi.Width = Math.Abs(currentPoint.X - _startPoint.X);
                        roi.Height = Math.Abs(currentPoint.Y - _startPoint.Y);
                        roi.X = Math.Min(_startPoint.X, currentPoint.X);
                        roi.Y = Math.Min(_startPoint.Y, currentPoint.Y);
                    }
                    break;

                case RoiOperationMode.Move:
                    // 移动模式
                    if (IsPointInRoi(_lastPoint))
                    {
                        roi.X += deltaX;
                        roi.Y += deltaY;
                    }
                    break;

                case RoiOperationMode.Resize:
                    // 调整大小模式
                    HandleResize(currentPoint, deltaX, deltaY);
                    break;

                case RoiOperationMode.Rotate:
                    // 旋转模式
                    if (_currentHandle == DragHandleType.Rotate)
                    {
                        HandleRotation(currentPoint);
                    }
                    break;
            }

            // 通用：如果点击了控制点，执行相应操作
            if (_currentHandle != DragHandleType.None)
            {
                HandleControlPoint(currentPoint, deltaX, deltaY);
            }

            _lastPoint = currentPoint;
            UpdateRoiVisual();
        }

        private void RoiCanvas_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            _isDragging = false;
            _currentHandle = DragHandleType.None;
            RoiCanvas.ReleaseMouseCapture();
        }

        private DragHandleType GetHandleAtPoint(System.Windows.Point point)
        {
            const double tolerance = 10;

            if (!ViewModel.CurrentRoi.IsValid)
                return DragHandleType.None;

            var roi = ViewModel.CurrentRoi;
            double centerX = roi.X + roi.Width / 2;
            double centerY = roi.Y + roi.Height / 2;

            // 检查角点
            if (IsPointNear(point, new System.Windows.Point(roi.X, roi.Y), tolerance))
                return DragHandleType.TopLeft;
            if (IsPointNear(point, new System.Windows.Point(roi.X + roi.Width, roi.Y), tolerance))
                return DragHandleType.TopRight;
            if (IsPointNear(point, new System.Windows.Point(roi.X, roi.Y + roi.Height), tolerance))
                return DragHandleType.BottomLeft;
            if (IsPointNear(point, new System.Windows.Point(roi.X + roi.Width, roi.Y + roi.Height), tolerance))
                return DragHandleType.BottomRight;

            // 检查边中点
            if (IsPointNear(point, new System.Windows.Point(centerX, roi.Y), tolerance))
                return DragHandleType.Top;
            if (IsPointNear(point, new System.Windows.Point(roi.X + roi.Width, centerY), tolerance))
                return DragHandleType.Right;
            if (IsPointNear(point, new System.Windows.Point(centerX, roi.Y + roi.Height), tolerance))
                return DragHandleType.Bottom;
            if (IsPointNear(point, new System.Windows.Point(roi.X, centerY), tolerance))
                return DragHandleType.Left;

            // 检查旋转控制点（在顶部上方）
            if (IsPointNear(point, new System.Windows.Point(centerX, roi.Y - 30), tolerance))
                return DragHandleType.Rotate;

            return DragHandleType.None;
        }

        private bool IsPointNear(System.Windows.Point p1, System.Windows.Point p2, double tolerance)
        {
            double distance = Math.Sqrt(Math.Pow(p1.X - p2.X, 2) + Math.Pow(p1.Y - p2.Y, 2));
            return distance <= tolerance;
        }

        private bool IsPointInRoi(System.Windows.Point point)
        {
            var roi = ViewModel.CurrentRoi;
            if (!roi.IsValid)
                return false;

            return point.X >= roi.X && point.X <= roi.X + roi.Width &&
                   point.Y >= roi.Y && point.Y <= roi.Y + roi.Height;
        }

        private void HandleResize(System.Windows.Point currentPoint, double deltaX, double deltaY)
        {
            // 根据当前控制点调整ROI大小（在HandleControlPoint中处理）
        }

        private void HandleRotation(System.Windows.Point currentPoint)
        {
            var roi = ViewModel.CurrentRoi;
            double centerX = roi.X + roi.Width / 2;
            double centerY = roi.Y + roi.Height / 2;

            // 计算旋转角度
            double angle1 = Math.Atan2(_startPoint.Y - centerY, _startPoint.X - centerX);
            double angle2 = Math.Atan2(currentPoint.Y - centerY, currentPoint.X - centerX);
            double deltaAngle = (angle2 - angle1) * 180 / Math.PI;

            roi.Angle = _originalAngle + deltaAngle;

            // 限制角度范围 -180 到 180
            while (roi.Angle > 180) roi.Angle -= 360;
            while (roi.Angle < -180) roi.Angle += 360;
        }

        private void HandleControlPoint(System.Windows.Point currentPoint, double deltaX, double deltaY)
        {
            var roi = ViewModel.CurrentRoi;

            switch (_currentHandle)
            {
                case DragHandleType.TopLeft:
                    roi.Width -= deltaX;
                    roi.Height -= deltaY;
                    roi.X += deltaX;
                    roi.Y += deltaY;
                    break;

                case DragHandleType.TopRight:
                    roi.Width += deltaX;
                    roi.Height -= deltaY;
                    roi.Y += deltaY;
                    break;

                case DragHandleType.BottomLeft:
                    roi.Width -= deltaX;
                    roi.Height += deltaY;
                    roi.X += deltaX;
                    break;

                case DragHandleType.BottomRight:
                    roi.Width += deltaX;
                    roi.Height += deltaY;
                    break;

                case DragHandleType.Top:
                    roi.Height -= deltaY;
                    roi.Y += deltaY;
                    break;

                case DragHandleType.Bottom:
                    roi.Height += deltaY;
                    break;

                case DragHandleType.Left:
                    roi.Width -= deltaX;
                    roi.X += deltaX;
                    break;

                case DragHandleType.Right:
                    roi.Width += deltaX;
                    break;

                case DragHandleType.Rotate:
                    HandleRotation(currentPoint);
                    break;
            }

            // 确保宽度和高度为正值
            if (roi.Width < 10)
            {
                roi.X -= (10 - roi.Width);
                roi.Width = 10;
            }
            if (roi.Height < 10)
            {
                roi.Y -= (10 - roi.Height);
                roi.Height = 10;
            }
        }

        private void UpdateRoiVisual()
        {
            if (ViewModel?.CurrentRoi == null || !ViewModel.CurrentRoi.IsValid)
            {
                RoiRectangle.Visibility = Visibility.Collapsed;
                HideAllHandles();
                return;
            }

            var roi = ViewModel.CurrentRoi;

            // 更新ROI矩形
            RoiRectangle.Visibility = Visibility.Visible;
            Canvas.SetLeft(RoiRectangle, roi.X);
            Canvas.SetTop(RoiRectangle, roi.Y);
            RoiRectangle.Width = roi.Width;
            RoiRectangle.Height = roi.Height;

            // 更新控制点位置
            UpdateHandlePositions(roi);
        }

        private void UpdateHandlePositions(Models.RoiModel roi)
        {
            double centerX = roi.X + roi.Width / 2;
            double centerY = roi.Y + roi.Height / 2;

            // 角点
            SetHandlePosition(TopLeftHandle, roi.X, roi.Y);
            SetHandlePosition(TopRightHandle, roi.X + roi.Width, roi.Y);
            SetHandlePosition(BottomLeftHandle, roi.X, roi.Y + roi.Height);
            SetHandlePosition(BottomRightHandle, roi.X + roi.Width, roi.Y + roi.Height);

            // 边中点
            SetHandlePosition(TopHandle, centerX, roi.Y);
            SetHandlePosition(RightHandle, roi.X + roi.Width, centerY);
            SetHandlePosition(BottomHandle, centerX, roi.Y + roi.Height);
            SetHandlePosition(LeftHandle, roi.X, centerY);

            // 旋转控制点
            SetHandlePosition(RotateHandle, centerX, roi.Y - 30);

            ShowAllHandles();
        }

        private void SetHandlePosition(UIElement handle, double x, double y)
        {
            if (handle is Ellipse ellipse)
            {
                Canvas.SetLeft(handle, x - ellipse.Width / 2);
                Canvas.SetTop(handle, y - ellipse.Height / 2);
            }
            else if (handle is Path path)
            {
                Canvas.SetLeft(handle, x - 5);
                Canvas.SetTop(handle, y - 5);
            }
            handle.Visibility = Visibility.Visible;
        }

        private void ShowAllHandles()
        {
            TopLeftHandle.Visibility = Visibility.Visible;
            TopRightHandle.Visibility = Visibility.Visible;
            BottomLeftHandle.Visibility = Visibility.Visible;
            BottomRightHandle.Visibility = Visibility.Visible;
            TopHandle.Visibility = Visibility.Visible;
            RightHandle.Visibility = Visibility.Visible;
            BottomHandle.Visibility = Visibility.Visible;
            LeftHandle.Visibility = Visibility.Visible;
            RotateHandle.Visibility = Visibility.Visible;
        }

        private void HideAllHandles()
        {
            TopLeftHandle.Visibility = Visibility.Collapsed;
            TopRightHandle.Visibility = Visibility.Collapsed;
            BottomLeftHandle.Visibility = Visibility.Collapsed;
            BottomRightHandle.Visibility = Visibility.Collapsed;
            TopHandle.Visibility = Visibility.Collapsed;
            RightHandle.Visibility = Visibility.Collapsed;
            BottomHandle.Visibility = Visibility.Collapsed;
            LeftHandle.Visibility = Visibility.Collapsed;
            RotateHandle.Visibility = Visibility.Collapsed;
        }
    }
}