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.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace MeterVision.Mark
{
    /// <summary>
    /// UCMark.xaml 的交互逻辑
    /// </summary>
    public partial class UCMark : UserControl
    {
        //当前的放大倍率
        //private double _sacle_value = 1.5f;

        //标注的类型: 4:表盘; 3:数字域; 2:首位指针; 0:未选中
        private int _mark_type = 0;

        //是否已加载图片
        //private bool _loadedImage = false;

        private MarkManager _markManager;

        private int _meterType = -1;
        public int MeterType
        {
            private get => _meterType;
            set
            {
                //if(_meterType != value)
                {
                    _meterType = value;
                    SetFeatureRegion(_meterType);
                }
            }
        }

        public event Action<string,int> MeterRegion_MarkFinished;
        public event Action<string,int> FeatureRegion_MarkFinished;


        BitmapImage bitmap;
        public UCMark()
        {
            InitializeComponent();

            _mark_type = 0;
            _markManager = new MarkManager(drawingCanvas);
            _markManager.MarkError += _markManager_MarkError;
            _markManager.FinishMark += _markManager_FinishMark;

            //初始化一些控件的默认显示值
            txtCurPoint.Text = "";

            this.Loaded += UCMark_Loaded;
        }

        private void UCMark_Loaded(object sender, RoutedEventArgs e)
        {
            //throw new NotImplementedException();
            //ChangeScale();
        }

        private void PnlCanvas_SizeChanged(object sender, SizeChangedEventArgs e)
        {
            ChangeScale();
            if (_markManager != null)
            {
                _markManager.ClearMark();
            }
        }

        public void SetImagePath(string imgPath)
        {
            //MeterType = meterType;
            //加载照片
            LoadImage(imgPath);
            //设置放大倍率
            //_sacle_value = 1.92f;
            //SetScaleTrnsform(_sacle_value);
        }

        //private void SetScaleTrnsform(double scale)
        //{
        //    scaleTransform.ScaleX = scale;
        //    scaleTransform.ScaleY = scale;
        //    _markManager.ClearMark();
        //}

        private void LoadImage(string filePath)
        {
            // 创建一个BitmapImage对象，并加载图片
            bitmap = new BitmapImage(new Uri(filePath));

            if (bitmap.Width != 320 || bitmap.Height != 240)
            {
                MessageBox.Show(Application.Current.MainWindow, "图片尺寸必须为320*240！", "提示",
                        MessageBoxButton.OK, MessageBoxImage.Information);
                return;
            }
            imgControl.Source = bitmap; // 将图片显示到Image控件中

            drawingCanvas.Width = bitmap.PixelWidth;
            drawingCanvas.Height = bitmap.PixelHeight;

            _markManager.InitMark();
        }

        private void ChangeScale()
        {
            // 获取图片原始尺寸
            double imageWidth = bitmap.PixelWidth;
            double imageHeight = bitmap.PixelHeight;

            // 获取pnlCanvas的实际可用区域（考虑Margin和Padding）
            double containerWidth = pnlCanvas.ActualWidth - pnlCanvas.Padding.Left - pnlCanvas.Padding.Right;
            double containerHeight = pnlCanvas.ActualHeight - pnlCanvas.Padding.Top - pnlCanvas.Padding.Bottom;

            // 计算缩放比例，留5%边距
            double scaleX = (containerWidth * 0.95) / imageWidth;
            double scaleY = (containerHeight * 0.95) / imageHeight;
            double scale = Math.Min(scaleX, scaleY);

            // 应用缩放
            scaleTransform.ScaleX = scale;
            scaleTransform.ScaleY = scale;

            // 计算图片缩放后的尺寸
            double scaledWidth = imageWidth * scale;
            double scaledHeight = imageHeight * scale;

            // 将图片居中于Canvas
            //Canvas.SetLeft(imgControl, (containerWidth - scaledWidth) / 2);
            //Canvas.SetTop(imgControl, (containerHeight - scaledHeight) / 2);

            // 关键步骤：强制Canvas与Image的渲染区域一致
            drawingCanvas.Width = scaledWidth;      //containerWidth;    // 使Canvas宽度与Border可用区域一致
            drawingCanvas.Height = scaledHeight;     //containerHeight;   // 使Canvas高度与Border可用区域一致
        }



        private void _markManager_FinishMark(int pointCount, List<Point> points, int angle)
        {
            double scaleX = scaleTransform.ScaleX;
            double scaleY = scaleTransform.ScaleY;

            string regions = "";

            if (_mark_type == 4)
            {
                //表盘标注完成(获取到2组坐标)
                Point point1 = points[0];
                Point point2 = points[1];
                int xMin = (int)(point1.X / scaleX);
                int yMin = (int)(point1.Y / scaleY);
                int xMax = (int)(point2.X / scaleX);
                int yMax = (int)(point2.Y / scaleY);
                regions = $"{xMin},{yMin} {xMax},{yMax}";
                MeterRegion_MarkFinished?.Invoke(regions,MeterType);
            }
            else if (_mark_type == 3)
            {
                //数字区域标注完成
                regions = $"" +
                    $"{(int)(points[0].X / scaleX)}," +
                    $"{(int)(points[0].Y / scaleY)} " +
                    $"{(int)(points[1].X / scaleX)}," +
                    $"{(int)(points[1].Y / scaleY)} " +
                    $"{(int)(points[2].X / scaleX)}," +
                    $"{(int)(points[2].Y / scaleY)} " +
                    $"{(int)(points[3].X / scaleX)}," +
                    $"{(int)(points[3].Y / scaleY)}";
                FeatureRegion_MarkFinished?.Invoke(regions,MeterType);
            }
            else if (_mark_type == 2)
            {
                //指针首位标注完成
                regions = $"" +
                    $"{(int)(points[0].X / scaleX)}," +
                    $"{(int)(points[0].Y / scaleY)} " +
                    $"{(int)(points[1].X / scaleX)}," +
                    $"{(int)(points[1].Y / scaleY)}";
                FeatureRegion_MarkFinished?.Invoke(regions, MeterType);
            }
        }

        private void _markManager_MarkError(string message)
        {
            MessageBox.Show(message);
        }

        private void SetFeatureRegion(int meterType)
        {
            if(meterType == 1 || meterType == 3)
            {
                pnlMarkFunc.Visibility = Visibility.Visible;
                btnFeatureRegion.Visibility = txtFeatureRegion.Visibility = Visibility.Visible;
                btnFeatureRegion.Content = "标注数据域(4点)";
            }
            else if(meterType == 2)
            {
                pnlMarkFunc.Visibility = Visibility.Visible;
                btnFeatureRegion.Visibility = txtFeatureRegion.Visibility = Visibility.Visible;
                btnFeatureRegion.Content = "标注首位指针(2点)";
            }
            else
            {
                pnlMarkFunc.Visibility = Visibility.Hidden;
                //btnFeatureRegion.Visibility = txtFeatureRegion.Visibility = Visibility.Collapsed;
            }

        }

        private void SetBtnMark(int mark_type)
        {
            btnMeterRegion.Foreground = btnFeatureRegion.Foreground = Brushes.Black;
            if(mark_type == 4)
            {
                btnMeterRegion.Foreground = Brushes.Red;
            }
            else if(mark_type == 2 || mark_type == 3)
            {
                btnFeatureRegion.Foreground = Brushes.Red;
            }
        }

        private void BtnMeterRegion_Click(object sender, RoutedEventArgs e)
        {
            if (MeterType <= 0) return;
            if(_mark_type != 4)
            {
                _mark_type = 4;
                _markManager.ReadyMark(_mark_type);
            }
            else
            {
                _mark_type = 0;
                _markManager.StopMark();
            }
            SetBtnMark(_mark_type);
        }

        private void BtnFeatureRegion_Click(object sender, RoutedEventArgs e)
        {          
            if(MeterType == 1 || MeterType == 3)
            {
                //数字域标注
                if(_mark_type != 3)
                {
                    _mark_type = 3;
                    _markManager.ReadyMark(_mark_type);
                }
                else
                {
                    _mark_type = 0;
                    _markManager.StopMark();
                }
            }
            else if(MeterType == 2)
            {
                //首位指针标注
                if(_mark_type != 2)
                {
                    _mark_type = 2;
                    _markManager.ReadyMark(_mark_type);
                }
                else
                {
                    _mark_type = 2;
                    _markManager.StopMark();
                }
            }
            SetBtnMark(_mark_type);
        }

        private void BtnClearMark_Click(object sender, RoutedEventArgs e)
        {
            _markManager.ClearMark();
        }

        private void DrawingCanvas_MouseDown(object sender, MouseButtonEventArgs e)
        {
            if (_markManager.IsMarking && _mark_type > 0)
            {
                //获取点击位置
                Point clickPoint = e.GetPosition(drawingCanvas);
                _markManager.PointMark(clickPoint);
            }
        }

        private void DrawingCanvas_MouseMove(object sender, MouseEventArgs e)
        {
            Point mousePos = e.GetPosition(drawingCanvas);

            // 将鼠标位置转换为原图的坐标
            double originalX = mousePos.X / scaleTransform.ScaleX;
            double originalY = mousePos.Y / scaleTransform.ScaleY;

            int mouseX = (int)originalX;
            int mouseY = (int)originalY;

            if(_markManager != null && _markManager.PointCount == 3) {
                _markManager.MouseDrawLine(mousePos);
            }

            //this.Title = $"Mouse Position : {mouseX},{mouseY}";
            txtCurPoint.Text = $"鼠标坐标: {mouseX},{mouseY}";
        }

        private void DrawingCanvas_MouseUp(object sender, MouseButtonEventArgs e)
        {

        }

        private void DrawingCanvas_MouseEnter(object sender, MouseEventArgs e)
        {
            if (_mark_type > 0)
            {
                this.Cursor = Cursors.Hand;
            }
            else
            {
                this.Cursor = Cursors.Arrow;
            }
        }

        private void DrawingCanvas_MouseLeave(object sender, MouseEventArgs e)
        {
            txtCurPoint.Text = "";
            this.Cursor = Cursors.Arrow;
        }


        //-----------------------------------------------------------------------
    }
}