using OpenCvSharp;
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.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;
using System.Windows.Media;
using TeamAAS_VP.Core;
using TeamAAS_VP.Enums;
using TeamAAS_VP.Models;

namespace TeamAAS_VP.Controls
{
    /// <summary>
    /// FocusAnalyzer用户控件ViewModel
    /// </summary>
    public class FocusAnalyzerViewModel : BindableBase
    {
        #region 可绑定属性

        // 图像源
        private ImageSource _currentImage;
        public ImageSource CurrentImage
        {
            get => _currentImage;
            set => SetProperty(ref _currentImage, value);
        }

        // 分析参数
        private AnalysisParameters _parameters = new AnalysisParameters();
        public AnalysisParameters Parameters
        {
            get => _parameters;
            set => SetProperty(ref _parameters, value);
        }

        // 当前结果
        private AnalysisResult _currentResult = new AnalysisResult();
        public AnalysisResult CurrentResult
        {
            get => _currentResult;
            set => SetProperty(ref _currentResult, value);
        }

        // 最终报告
        private AnalysisReport _finalReport = new AnalysisReport();
        public AnalysisReport FinalReport
        {
            get => _finalReport;
            set => SetProperty(ref _finalReport, value);
        }

        // 分析状态
        private bool _isAnalyzing;
        public bool IsAnalyzing
        {
            get => _isAnalyzing;
            set => SetProperty(ref _isAnalyzing, value);
        }

        // ROI区域
        private RotatedRect _currentRoi;
        public RotatedRect CurrentRoi
        {
            get => _currentRoi;
            set => SetProperty(ref _currentRoi, value);
        }

        // 是否显示ROI
        private bool _showRoi = true;
        public bool ShowRoi
        {
            get => _showRoi;
            set => SetProperty(ref _showRoi, value);
        }

        // ROI操作模式
        private RoiOperationMode _roiMode = RoiOperationMode.Draw;
        public RoiOperationMode RoiMode
        {
            get => _roiMode;
            set => SetProperty(ref _roiMode, value);
        }

        // 图表模型
        private PlotModel _plotModel;
        public PlotModel PlotModel
        {
            get => _plotModel;
            set => SetProperty(ref _plotModel, value);
        }

        // 状态文本
        private string _statusText = "就绪";
        public string StatusText
        {
            get => _statusText;
            set => SetProperty(ref _statusText, value);
        }

        // 帧数文本
        private string _frameCountText = "帧数: 0";
        public string FrameCountText
        {
            get => _frameCountText;
            set => SetProperty(ref _frameCountText, value);
        }

        // 最佳清晰度文本
        private string _bestSharpnessText = "最佳: 0.00";
        public string BestSharpnessText
        {
            get => _bestSharpnessText;
            set => SetProperty(ref _bestSharpnessText, value);
        }

        // 枚举列表
        public Array FocusMethods => Enum.GetValues(typeof(FocusMethod));
        public Array AnalysisModes => Enum.GetValues(typeof(AnalysisMode));

        #endregion

        #region 命令

        // 控制命令（绑定到外部）
        public ICommand StartAnalysisCommand { get; set; }
        public ICommand StopAnalysisCommand { get; set; }
        public ICommand ResetCommand { get; set; }
        public ICommand ExportCommand { get; set; }

        // 内部命令
        public DelegateCommand<object> SetRoiModeCommand { get; private set; }
        public DelegateCommand ClearRoiCommand { get; private set; }

        #endregion

        #region 事件

        // 控件事件（供外部订阅）
        public event EventHandler AnalysisStarted;
        public event EventHandler AnalysisStopped;
        public event EventHandler RoiChanged;
        public event EventHandler<ErrorEventArgs> ErrorOccurred;

        #endregion

        #region 私有字段

        private int _frameCounter = 0;
        private double _bestSharpness = 0;
        private DateTime _startTime;
        private ObservableCollection<Models.DataPoint> _historyData = new ObservableCollection<Models.DataPoint>();

        // ROI绘制状态
        private System.Windows.Point _roiStartPoint;
        private System.Windows.Point _roiDragStartPoint;
        private RotatedRect _roiBeforeDrag;
        private DragHandleType _currentDragHandle = DragHandleType.None;

        #endregion

        #region 构造函数

        public FocusAnalyzerViewModel()
        {
            InitializeCommands();
            InitializeProperties();
            InitializePlot();
        }

        #endregion

        #region 初始化

        private void InitializeCommands()
        {
            // ROI模式切换命令
            SetRoiModeCommand = new DelegateCommand<object>(mode =>
            {
                RoiMode = (RoiOperationMode)mode;
            });

            // 清除ROI命令
            ClearRoiCommand = new DelegateCommand(() =>
            {
                CurrentRoi = null;
                OnRoiChanged();
            });
        }

        private void InitializeProperties()
        {
            Parameters = new AnalysisParameters();
            CurrentResult = new AnalysisResult();
            FinalReport = new AnalysisReport();

            // 初始化默认ROI
            CurrentRoi = new RotatedRect(100, 100, 200, 200, 0);
        }

        private void InitializePlot()
        {
            PlotModel = new PlotModel
            {
                Title = "清晰度变化曲线",
                TitleFontSize = 12,
                PlotMargins = new OxyThickness(40, 10, 10, 40)
            };

            PlotModel.Axes.Add(new LinearAxis
            {
                Position = AxisPosition.Bottom,
                Title = "帧序列",
                MajorGridlineStyle = LineStyle.Solid,
                MinorGridlineStyle = LineStyle.Dot
            });

            PlotModel.Axes.Add(new LinearAxis
            {
                Position = AxisPosition.Left,
                Title = "清晰度",
                MajorGridlineStyle = LineStyle.Solid,
                MinorGridlineStyle = LineStyle.Dot
            });

            PlotModel.Series.Add(new LineSeries
            {
                Title = "清晰度",
                Color = OxyColors.DodgerBlue,
                StrokeThickness = 2
            });
        }

        #endregion

        #region 公共方法

        /// <summary>
        /// 处理图像帧
        /// </summary>
        public async Task ProcessImageFrameAsync(Mat frame)
        {
            if (!IsAnalyzing || frame == null || frame.Empty())
                return;

            try
            {
                // 更新图像
                await App.Current.Dispatcher.InvokeAsync(() =>
                {
                    CurrentImage = BitmapSourceConverter.ToBitmapSource(frame);
                });

                // 执行分析
                await Task.Run(() => PerformAnalysis(frame));
                _frameCounter++;

                // 更新UI
                UpdateStatusText();
            }
            catch (Exception ex)
            {
                OnErrorOccurred(new ErrorEventArgs($"处理图像帧失败: {ex.Message}", ex));
            }
        }

        /// <summary>
        /// 执行单次分析
        /// </summary>
        public void PerformAnalysis(Mat frame)
        {
            if (frame == null || frame.Empty())
                return;

            try
            {
                // 将RotatedRect转换为Rect（简化处理）
                Rect? roiRect = null;
                if (CurrentRoi != null)
                {
                    roiRect = new Rect((int)CurrentRoi.X, (int)CurrentRoi.Y, (int)CurrentRoi.Width, (int)CurrentRoi.Height);
                }

                // 计算清晰度
                double sharpness = FocusAnalysisEngine.CalculateImageSharpness(
                    frame, Parameters.FocusMethod, roiRect);

                // 分析棋盘格
                CheckerboardResult checkerboard;
                if (Parameters.AnalysisMode == AnalysisMode.AutoCheckerboard)
                {
                    checkerboard = FocusAnalysisEngine.AnalyzeCheckerboardContrast(frame, roiRect);
                }
                else
                {
                    checkerboard = new CheckerboardResult();
                }

                // 更新结果
                App.Current.Dispatcher.Invoke(() =>
                {
                    UpdateAnalysisResult(sharpness, checkerboard);
                    UpdateHistoryData(sharpness, checkerboard);
                    UpdatePlot();
                });
            }
            catch (Exception ex)
            {
                OnErrorOccurred(new ErrorEventArgs($"图像分析失败: {ex.Message}", ex));
            }
        }

        #endregion

        #region ROI绘制方法

        /// <summary>
        /// 开始ROI绘制
        /// </summary>
        public void StartRoiDrawing(System.Windows.Point startPoint)
        {
            if (RoiMode != RoiOperationMode.Draw)
                return;

            _roiStartPoint = startPoint;
            CurrentRoi = new RotatedRect(startPoint.X, startPoint.Y, 0, 0, 0);
        }

        /// <summary>
        /// 更新ROI绘制
        /// </summary>
        public void UpdateRoiDrawing(System.Windows.Point currentPoint)
        {
            if (RoiMode != RoiOperationMode.Draw || CurrentRoi == null)
                return;

            double x = Math.Min(_roiStartPoint.X, currentPoint.X);
            double y = Math.Min(_roiStartPoint.Y, currentPoint.Y);
            double width = Math.Abs(currentPoint.X - _roiStartPoint.X);
            double height = Math.Abs(currentPoint.Y - _roiStartPoint.Y);

            CurrentRoi.X = x;
            CurrentRoi.Y = y;
            CurrentRoi.Width = width;
            CurrentRoi.Height = height;
        }

        /// <summary>
        /// 完成ROI绘制
        /// </summary>
        public void FinishRoiDrawing()
        {
            OnRoiChanged();
        }

        /// <summary>
        /// 开始ROI拖动
        /// </summary>
        public bool StartRoiDrag(System.Windows.Point point)
        {
            if (CurrentRoi == null || !CurrentRoi.ContainsPoint(point))
                return false;

            // 检查是否点击了控制点
            _currentDragHandle = GetDragHandleAtPoint(point);

            if (_currentDragHandle != DragHandleType.None)
            {
                _roiDragStartPoint = point;
                _roiBeforeDrag = new RotatedRect(
                    CurrentRoi.X, CurrentRoi.Y,
                    CurrentRoi.Width, CurrentRoi.Height,
                    CurrentRoi.Angle);
                return true;
            }

            return false;
        }

        /// <summary>
        /// 更新ROI拖动
        /// </summary>
        public void UpdateRoiDrag(System.Windows.Point currentPoint)
        {
            if (CurrentRoi == null || _roiBeforeDrag == null)
                return;

            double deltaX = currentPoint.X - _roiDragStartPoint.X;
            double deltaY = currentPoint.Y - _roiDragStartPoint.Y;

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

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

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

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

                case DragHandleType.Rotate:
                    // 计算旋转角度
                    var center = new System.Windows.Point(
                        _roiBeforeDrag.CenterX,
                        _roiBeforeDrag.CenterY);
                    double startAngle = Math.Atan2(
                        _roiDragStartPoint.Y - center.Y,
                        _roiDragStartPoint.X - center.X);
                    double currentAngle = Math.Atan2(
                        currentPoint.Y - center.Y,
                        currentPoint.X - center.X);
                    double angleDelta = (currentAngle - startAngle) * 180 / Math.PI;
                    CurrentRoi.Angle = (_roiBeforeDrag.Angle + angleDelta) % 360;
                    break;

                case DragHandleType.None:
                    // 移动整个ROI
                    CurrentRoi.X = _roiBeforeDrag.X + deltaX;
                    CurrentRoi.Y = _roiBeforeDrag.Y + deltaY;
                    break;
            }
        }

        /// <summary>
        /// 结束ROI拖动
        /// </summary>
        public void FinishRoiDrag()
        {
            _currentDragHandle = DragHandleType.None;
            _roiBeforeDrag = null;
            OnRoiChanged();
        }

        /// <summary>
        /// 获取指定点的控制点类型
        /// </summary>
        private DragHandleType GetDragHandleAtPoint(System.Windows.Point point)
        {
            if (CurrentRoi == null) return DragHandleType.None;

            const double handleSize = 8;
            var center = new System.Windows.Point(CurrentRoi.CenterX, CurrentRoi.CenterY);

            // 检查旋转控制点（在矩形顶部中心上方）
            var rotateHandle = new System.Windows.Point(center.X, CurrentRoi.Y - 20);
            if (Distance(point, rotateHandle) <= handleSize)
                return DragHandleType.Rotate;

            // 检查角点
            var corners = new[]
            {
                new System.Windows.Point(CurrentRoi.X, CurrentRoi.Y), // 左上
                new System.Windows.Point(CurrentRoi.X + CurrentRoi.Width, CurrentRoi.Y), // 右上
                new System.Windows.Point(CurrentRoi.X, CurrentRoi.Y + CurrentRoi.Height), // 左下
                new System.Windows.Point(CurrentRoi.X + CurrentRoi.Width, CurrentRoi.Y + CurrentRoi.Height) // 右下
            };

            // 替换 switch 表达式为 switch 语句以兼容 C# 7.3
            for (int i = 0; i < corners.Length; i++)
            {
                if (Distance(point, corners[i]) <= handleSize)
                {
                    switch (i)
                    {
                        case 0:
                            return DragHandleType.TopLeft;
                        case 1:
                            return DragHandleType.TopRight;
                        case 2:
                            return DragHandleType.BottomLeft;
                        case 3:
                            return DragHandleType.BottomRight;
                        default:
                            return DragHandleType.None;
                    }
                }
            }

            return DragHandleType.None;
        }

        private double Distance(System.Windows.Point p1, System.Windows.Point p2)
        {
            return Math.Sqrt(Math.Pow(p2.X - p1.X, 2) + Math.Pow(p2.Y - p1.Y, 2));
        }

        #endregion

        #region 私有方法

        private void UpdateAnalysisResult(double sharpness, CheckerboardResult checkerboard)
        {
            double qualityScore = FocusAnalysisEngine.CalculateQualityScore(sharpness, checkerboard);
            var suggestions = FocusAnalysisEngine.GenerateSuggestions(
                sharpness, checkerboard,
                Parameters.SharpnessThreshold,
                Parameters.ContrastThreshold);

            if (sharpness > _bestSharpness)
                _bestSharpness = sharpness;

            CurrentResult.Sharpness = sharpness;
            CurrentResult.Checkerboard = checkerboard;
            CurrentResult.QualityScore = qualityScore;
            CurrentResult.FrameCount = _frameCounter + 1;
            CurrentResult.BestSharpness = _bestSharpness;
            CurrentResult.AnalysisTime = DateTime.Now;
            CurrentResult.Suggestions = new ObservableCollection<string>(suggestions);
        }

        private void UpdateHistoryData(double sharpness, CheckerboardResult checkerboard)
        {
            var dataPoint = new Models.DataPoint(_frameCounter, sharpness,
                checkerboard.Detected ? checkerboard.Contrast : 0);
            _historyData.Add(dataPoint);

            // 添加到最终报告
            FinalReport.HistoryData.Add(dataPoint);
        }

        private void UpdatePlot()
        {
            if (PlotModel.Series[0] is LineSeries series)
            {
                series.Points.Clear();

                for (int i = 0; i < _historyData.Count; i++)
                {
                    series.Points.Add(new OxyPlot.DataPoint(i, _historyData[i].Sharpness));
                }

                // 限制显示点数
                if (series.Points.Count > 200)
                {
                    series.Points.RemoveRange(0, series.Points.Count - 200);
                }

                PlotModel.InvalidatePlot(true);
            }
        }

        private void UpdateStatusText()
        {
            StatusText = $"分析中... 第 {_frameCounter + 1} 帧";
            FrameCountText = $"帧数: {_frameCounter + 1}";
            BestSharpnessText = $"最佳: {_bestSharpness:F2}";
        }

        #endregion

        #region 事件触发方法

        protected virtual void OnAnalysisStarted()
        {
            AnalysisStarted?.Invoke(this, EventArgs.Empty);
        }

        protected virtual void OnAnalysisStopped()
        {
            AnalysisStopped?.Invoke(this, EventArgs.Empty);
        }

        protected virtual void OnRoiChanged()
        {
            RoiChanged?.Invoke(this, EventArgs.Empty);
        }

        protected virtual void OnErrorOccurred(ErrorEventArgs e)
        {
            ErrorOccurred?.Invoke(this, e);
        }

        #endregion
    }

    public class ErrorEventArgs : EventArgs
    {
        public string Message { get; }
        public Exception Exception { get; }

        public ErrorEventArgs(string message, Exception exception = null)
        {
            Message = message;
            Exception = exception;
        }
    }
}