using System.Drawing;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using XP.Camera.Calibration.ViewModels;
using WpfBrushes = System.Windows.Media.Brushes;
using WpfColor = System.Windows.Media.Color;

namespace XP.Camera.Calibration.Controls;

public partial class CalibrationControl : UserControl
{
    private CalibrationViewModel? _viewModel;

    public CalibrationControl()
    {
        InitializeComponent();
        Loaded += CalibrationControl_Loaded;
    }

    private void CalibrationControl_Loaded(object sender, RoutedEventArgs e)
    {
        if (DataContext is CalibrationViewModel viewModel)
        {
            _viewModel = viewModel;

            _viewModel.ImageLoadedRequested += (s, e) =>
            {
                imageCanvas.ReferenceImage = _viewModel.ImageSource;
                imageCanvas.RoiCanvas.Children.Clear();
            };

            imageCanvas.CanvasRightMouseUp += ImageCanvas_RightMouseUp;
            imageCanvas.CanvasMouseWheel += ImageCanvas_MouseWheel;
        }
    }

    private void ImageCanvas_MouseWheel(object? sender, MouseWheelEventArgs e)
    {
        if (_viewModel?.CurrentImage == null) return;

        double zoom = e.Delta > 0 ? 1.1 : 0.9;
        imageCanvas.ZoomScale *= zoom;
        imageCanvas.ZoomScale = Math.Max(0.1, Math.Min(imageCanvas.ZoomScale, 10));
    }

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

        var pos = e.GetPosition(imageCanvas.RoiCanvas);
        float imageX = (float)pos.X;
        float imageY = (float)pos.Y;

        if (imageX >= 0 && imageX < _viewModel.CurrentImage.Width &&
            imageY >= 0 && imageY < _viewModel.CurrentImage.Height)
        {
            var pixelPoint = new PointF(imageX, imageY);
            var worldPoint = _viewModel.ConvertPixelToWorld(pixelPoint);

            _viewModel.StatusText = $"像素坐标: ({imageX:F2}, {imageY:F2})\n世界坐标: ({worldPoint.X:F2}, {worldPoint.Y:F2})";

            DrawMarkerOnCanvas(imageX, imageY, worldPoint);
        }
    }

    private void DrawMarkerOnCanvas(float imageX, float imageY, PointF worldPoint)
    {
        imageCanvas.RoiCanvas.Children.Clear();

        var ellipse = new System.Windows.Shapes.Ellipse
        {
            Width = 10, Height = 10,
            Stroke = WpfBrushes.Red, StrokeThickness = 2,
            Fill = WpfBrushes.Transparent
        };
        Canvas.SetLeft(ellipse, imageX - 5);
        Canvas.SetTop(ellipse, imageY - 5);
        imageCanvas.RoiCanvas.Children.Add(ellipse);

        var pixelText = new TextBlock
        {
            Text = $"P:({imageX:F0},{imageY:F0})",
            Foreground = WpfBrushes.Red, FontSize = 12,
            Background = new System.Windows.Media.SolidColorBrush(WpfColor.FromArgb(180, 255, 255, 255))
        };
        Canvas.SetLeft(pixelText, imageX + 10);
        Canvas.SetTop(pixelText, imageY - 20);
        imageCanvas.RoiCanvas.Children.Add(pixelText);

        if (_viewModel?.ShowWorldCoordinates == true)
        {
            var worldText = new TextBlock
            {
                Text = $"W:({worldPoint.X:F2},{worldPoint.Y:F2})",
                Foreground = WpfBrushes.Blue, FontSize = 12,
                Background = new System.Windows.Media.SolidColorBrush(WpfColor.FromArgb(180, 255, 255, 255))
            };
            Canvas.SetLeft(worldText, imageX + 10);
            Canvas.SetTop(worldText, imageY + 5);
            imageCanvas.RoiCanvas.Children.Add(worldText);
        }
    }
}