using OpenCvSharp;
using OpenCvSharp.WpfExtensions;
using OxyPlot;
using OxyPlot.Axes;
using OxyPlot.Series;
using Prism.Commands;
using Prism.Mvvm;
using SqlSugar;
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 System.Windows.Media.Imaging;
using System.Windows.Threading;
using TeamAAS_VP.Core;
using TeamAAS_VP.Enums;
using TeamAAS_VP.Models;
using TeamAAS_VP.Services;

namespace TeamAAS_VP.Controls
{
    /// <summary>
    /// FocusAnalyzer用户控件ViewModel
    /// </summary>
    public class FocusAnalyzerViewModel : BindableBase
    {
        private readonly FileDialogService _fileDialogService;
        private readonly ImageAnalysisService _imageAnalysisService;
        private readonly CheckerboardDetectionService _checkerboardService;
        private readonly DispatcherTimer _analysisTimer;

        private string _title = "棋盘格清晰度分析工具";
        private BitmapSource _currentImage;
        private Mat _currentMat;
        private AnalysisParameters _parameters;
        private AnalysisResult _currentResult;
        private RoiModel _currentRoi;
        private ChessboardInfo _chessboardInfo;
        private RoiOperationMode _roiMode;
        private string _statusText;
        private bool _isAnalyzing;
        private double _bestSharpness;
        private int _frameCount;
        private PlotModel _plotModel;
        private List<AnalysisResult> _resultHistory;

        // function to convert ROI from canvas coords to image pixel Rect (set by view)
        public Func<RoiModel, OpenCvSharp.Rect?> RoiToImageRectConverter { get; set; }

        public string Title
        {
            get => _title;
            set => SetProperty(ref _title, value);
        }

        public BitmapSource CurrentImage
        {
            get => _currentImage;
            set => SetProperty(ref _currentImage, value);
        }

        public AnalysisParameters Parameters
        {
            get => _parameters;
            set => SetProperty(ref _parameters, value);
        }

        public AnalysisResult CurrentResult
        {
            get => _currentResult;
            set => SetProperty(ref _currentResult, value);
        }

        public RoiModel CurrentRoi
        {
            get => _currentRoi;
            set => SetProperty(ref _currentRoi, value);
        }

        public ChessboardInfo ChessboardInfo
        {
            get => _chessboardInfo;
            set => SetProperty(ref _chessboardInfo, value);
        }

        public RoiOperationMode RoiMode
        {
            get => _roiMode;
            set => SetProperty(ref _roiMode, value);
        }

        public string StatusText
        {
            get => _statusText;
            set => SetProperty(ref _statusText, value);
        }

        public bool IsAnalyzing
        {
            get => _isAnalyzing;
            set => SetProperty(ref _isAnalyzing, value);
        }

        public PlotModel PlotModel
        {
            get => _plotModel;
            set => SetProperty(ref _plotModel, value);
        }

        public string BestSharpnessText => _bestSharpness > 0 ? $"{_bestSharpness:F2}" : "N/A";
        public string FrameCountText => $"帧数: {_frameCount}";

        public ObservableCollection<FocusMethod> FocusMethods { get; }
        public ObservableCollection<AnalysisMode> AnalysisModes { get; }

        public DelegateCommand LoadImageCommand { get; }
        public DelegateCommand StartAnalysisCommand { get; }
        public DelegateCommand StopAnalysisCommand { get; }
        public DelegateCommand ResetCommand { get; }
        public DelegateCommand ExportCommand { get; }
        public DelegateCommand ClearRoiCommand { get; }
        public DelegateCommand DetectChessboardCommand { get; }

        public FocusAnalyzerViewModel()
        {
            _fileDialogService = new FileDialogService();
            _imageAnalysisService = new ImageAnalysisService();
            _checkerboardService = new CheckerboardDetectionService();

            _parameters = new AnalysisParameters();
            _currentResult = new AnalysisResult();
            _currentRoi = new RoiModel();
            _resultHistory = new List<AnalysisResult>();
            _roiMode = RoiOperationMode.Draw; // 默认为绘制模式

            FocusMethods = new ObservableCollection<FocusMethod>(Enum.GetValues(typeof(FocusMethod)).Cast<FocusMethod>());
            AnalysisModes = new ObservableCollection<AnalysisMode>(Enum.GetValues(typeof(AnalysisMode)).Cast<AnalysisMode>());

            LoadImageCommand = new DelegateCommand(OnLoadImage);
            StartAnalysisCommand = new DelegateCommand(OnStartAnalysis, CanStartAnalysis).ObservesProperty(() => CurrentImage);
            StopAnalysisCommand = new DelegateCommand(OnStopAnalysis, () => IsAnalyzing).ObservesProperty(() => IsAnalyzing);
            ResetCommand = new DelegateCommand(OnReset);
            ExportCommand = new DelegateCommand(OnExport, () => _resultHistory.Count > 0);
            ClearRoiCommand = new DelegateCommand(OnClearRoi);
            DetectChessboardCommand = new DelegateCommand(OnDetectChessboard, () => _currentMat != null);

            InitializePlot();

            _analysisTimer = new DispatcherTimer
            {
                Interval = TimeSpan.FromMilliseconds(100)
            };
            _analysisTimer.Tick += OnAnalysisTick;

            StatusText = "就绪";
        }

        private void OnLoadImage()
        {
            try
            {
                string filePath = _fileDialogService.OpenImageFile();
                if (string.IsNullOrEmpty(filePath))
                    return;

                // 释放之前的图像
                _currentMat?.Dispose();

                // 加载图像
                _currentMat = Cv2.ImRead(filePath, ImreadModes.Color);
                if (_currentMat == null || _currentMat.Empty())
                {
                    StatusText = "无法加载图像";
                    return;
                }

                // 转换为WPF图像
                CurrentImage = _currentMat.ToWriteableBitmap();

                // 自动检测棋盘格
                OnDetectChessboard();

                // 如果启用了实时分析，立即分析
                if (Parameters.EnableRealtimeAnalysis)
                {
                    AnalyzeCurrentImage();
                }

                StatusText = $"图像已加载: {_currentMat.Width}x{_currentMat.Height}";
            }
            catch (Exception ex)
            {
                StatusText = $"加载图像失败: {ex.Message}";
            }
        }

        private void OnDetectChessboard()
        {
            if (_currentMat == null || _currentMat.Empty())
                return;

            try
            {
                StatusText = "正在检测棋盘格...";

                Task.Run(() =>
                {
                    ChessboardInfo info = null;

                    if (RoiToImageRectConverter != null && CurrentRoi?.IsValid == true)
                    {
                        var imgRoi = RoiToImageRectConverter(CurrentRoi);
                        if (imgRoi.HasValue)
                        {
                            using (var sub = new Mat(_currentMat, imgRoi.Value))
                            {
                                info = _checkerboardService.DetectChessboard(sub);
                            }

                            if (info != null && info.IsDetected)
                            {
                                for (int i = 0; i < info.Corners.Length; i++)
                                {
                                    info.Corners[i].X += imgRoi.Value.X;
                                    info.Corners[i].Y += imgRoi.Value.Y;
                                }
                                var br = info.BoundingRect;
                                info.BoundingRect = new OpenCvSharp.Rect(br.X + imgRoi.Value.X, br.Y + imgRoi.Value.Y, br.Width, br.Height);
                            }
                        }
                    }

                    if (info == null || !info.IsDetected)
                    {
                        info = _checkerboardService.DetectChessboard(_currentMat);
                    }

                    System.Windows.Application.Current.Dispatcher.Invoke(() =>
                    {
                        ChessboardInfo = info;

                        if (info.IsDetected)
                        {
                            StatusText = $"检测成功: {info.CornersWidth}x{info.CornersHeight} 角点";

                            // 绘制棋盘格
                            var displayMat = _currentMat.Clone();
                            _checkerboardService.DrawChessboard(displayMat, info);
                            CurrentImage = displayMat.ToWriteableBitmap();
                            displayMat.Dispose();
                        }
                        else
                        {
                            StatusText = "未检测到棋盘格";
                        }
                    });
                });
            }
            catch (Exception ex)
            {
                StatusText = $"检测失败: {ex.Message}";
            }
        }

        private bool CanStartAnalysis()
        {
            return CurrentImage != null && !IsAnalyzing;
        }

        private void OnStartAnalysis()
        {
            IsAnalyzing = true;
            _frameCount = 0;
            _bestSharpness = 0;
            _resultHistory.Clear();
            StatusText = "分析中...";

            if (Parameters.EnableRealtimeAnalysis)
            {
                _analysisTimer.Start();
            }
            else
            {
                AnalyzeCurrentImage();
                IsAnalyzing = false;
                StatusText = "分析完成";
            }
        }

        private void OnStopAnalysis()
        {
            _analysisTimer.Stop();
            IsAnalyzing = false;
            StatusText = "已停止";
        }

        private void OnAnalysisTick(object sender, EventArgs e)
        {
            AnalyzeCurrentImage();
        }

        private void AnalyzeCurrentImage()
        {
            if (_currentMat == null || _currentMat.Empty())
                return;

            try
            {
                Rect? roi = null;

                // 根据分析模式确定分析区域
                switch (Parameters.AnalysisMode)
                {
                    case AnalysisMode.RoiOnly:
                        if (CurrentRoi.IsValid)
                        {
                            if (RoiToImageRectConverter != null)
                            {
                                roi = RoiToImageRectConverter(CurrentRoi);
                            }
                            else
                            {
                                roi = new Rect(
                                    (int)CurrentRoi.X,
                                    (int)CurrentRoi.Y,
                                    (int)CurrentRoi.Width,
                                    (int)CurrentRoi.Height);
                            }
                        }
                        break;

                    case AnalysisMode.ChessboardOnly:
                        if (ChessboardInfo?.IsDetected == true)
                        {
                            roi = ChessboardInfo.BoundingRect;
                        }
                        break;
                }

                // 执行分析
                var result = _imageAnalysisService.AnalyzeImage(_currentMat, Parameters.FocusMethod, roi);

                CurrentResult = result;
                _resultHistory.Add(result);
                _frameCount++;

                // 更新最佳清晰度
                if (result.Sharpness > _bestSharpness)
                {
                    _bestSharpness = result.Sharpness;
                    RaisePropertyChanged(nameof(BestSharpnessText));
                }

                RaisePropertyChanged(nameof(FrameCountText));

                // 更新图表
                UpdatePlot();

                StatusText = $"清晰度: {result.Sharpness:F2}, 对比度: {result.Contrast:F2}";
            }
            catch (Exception ex)
            {
                StatusText = $"分析错误: {ex.Message}";
            }
        }

        private void OnReset()
        {
            OnStopAnalysis();
            _frameCount = 0;
            _bestSharpness = 0;
            _resultHistory.Clear();
            CurrentResult = new AnalysisResult();
            InitializePlot();
            StatusText = "已重置";
            RaisePropertyChanged(nameof(BestSharpnessText));
            RaisePropertyChanged(nameof(FrameCountText));
        }

        private void OnExport()
        {
            try
            {
                string filePath = _fileDialogService.SaveFile(
                    $"分析报告_{DateTime.Now:yyyyMMdd_HHmmss}.csv",
                    "CSV文件|*.csv|所有文件|*.*");

                if (string.IsNullOrEmpty(filePath))
                    return;

                using (var writer = new System.IO.StreamWriter(filePath))
                {
                    writer.WriteLine("时间,清晰度,对比度,质量评分");
                    foreach (var result in _resultHistory)
                    {
                        writer.WriteLine($"{result.Timestamp:yyyy-MM-dd HH:mm:ss.fff},{result.Sharpness:F2},{result.Contrast:F2},{result.QualityScore:F2}");
                    }
                }

                StatusText = $"报告已导出: {filePath}";
            }
            catch (Exception ex)
            {
                StatusText = $"导出失败: {ex.Message}";
            }
        }

        private void OnClearRoi()
        {
            CurrentRoi = new RoiModel();
            StatusText = "ROI已清除";
        }

        private void InitializePlot()
        {
            PlotModel = new PlotModel
            {
                Title = "清晰度趋势",
                Background = OxyColors.White
            };

            PlotModel.Axes.Add(new LinearAxis
            {
                Position = AxisPosition.Bottom,
                Title = "帧数",
                MajorGridlineStyle = LineStyle.Solid,
                MinorGridlineStyle = LineStyle.Dot,
                MajorGridlineColor = OxyColor.FromRgb(230, 230, 230)
            });

            PlotModel.Axes.Add(new LinearAxis
            {
                Position = AxisPosition.Left,
                Title = "清晰度",
                MajorGridlineStyle = LineStyle.Solid,
                MinorGridlineStyle = LineStyle.Dot,
                MajorGridlineColor = OxyColor.FromRgb(230, 230, 230)
            });

            var series = new LineSeries
            {
                Title = "清晰度",
                Color = OxyColor.FromRgb(0, 122, 204),
                StrokeThickness = 2,
                MarkerType = MarkerType.Circle,
                MarkerSize = 3,
                MarkerFill = OxyColor.FromRgb(0, 122, 204)
            };

            PlotModel.Series.Add(series);
        }

        private void UpdatePlot()
        {
            if (PlotModel.Series.Count == 0)
                return;

            var series = PlotModel.Series[0] as LineSeries;
            if (series == null)
                return;

            series.Points.Clear();

            for (int i = 0; i < _resultHistory.Count; i++)
            {
                series.Points.Add(new OxyPlot.DataPoint(i + 1, _resultHistory[i].Sharpness));
            }

            PlotModel.InvalidatePlot(true);
        }
    }
}