using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Shapes;

namespace LineCircleRectangleDrawingApp
{
    public partial class MainWindow : Window
    {
        private Line currentLine;
        private Ellipse currentCircle;
        private Rectangle currentRectangle;
        private Point startPoint;
        private bool isDrawingLine = false;
        private bool isDrawingCircle = false;
        private bool isDrawingRectangle = false;

        public MainWindow()
        {
            InitializeComponent();
        }

        private void btnDrawLine_Click(object sender, RoutedEventArgs e)
        {
            if (currentCircle != null)
            {
                canvas.Children.Remove(currentCircle);
                currentCircle = null;
            }

            if (currentRectangle != null)
            {
                canvas.Children.Remove(currentRectangle);
                currentRectangle = null;
            }

            if (currentLine == null)
            {
                currentLine = new Line
                {
                    Stroke = Brushes.Black,
                    StrokeThickness = 2
                };
                canvas.Children.Add(currentLine);
            }
            isDrawingLine = true;
            isDrawingCircle = false;
            isDrawingRectangle = false;
        }

        private void btnDrawCircle_Click(object sender, RoutedEventArgs e)
        {
            if (currentLine != null)
            {
                canvas.Children.Remove(currentLine);
                currentLine = null;
            }

            if (currentRectangle != null)
            {
                canvas.Children.Remove(currentRectangle);
                currentRectangle = null;
            }

            if (currentCircle == null)
            {
                currentCircle = new Ellipse
                {
                    Stroke = Brushes.Black,
                    StrokeThickness = 2
                };
                canvas.Children.Add(currentCircle);
            }
            isDrawingCircle = true;
            isDrawingLine = false;
            isDrawingRectangle = false;
        }

        private void btnDrawRectangle_Click(object sender, RoutedEventArgs e)
        {
            if (currentLine != null)
            {
                canvas.Children.Remove(currentLine);
                currentLine = null;
            }

            if (currentCircle != null)
            {
                canvas.Children.Remove(currentCircle);
                currentCircle = null;
            }

            if (currentRectangle == null)
            {
                currentRectangle = new Rectangle
                {
                    Stroke = Brushes.Black,
                    StrokeThickness = 2,
                    Fill = Brushes.Transparent
                };
                canvas.Children.Add(currentRectangle);
            }
            isDrawingRectangle = true;
            isDrawingLine = false;
            isDrawingCircle = false;
        }

        private void canvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            startPoint = e.GetPosition(canvas);

            if (isDrawingLine)
            {
                if (currentLine != null)
                {
                    currentLine.X1 = startPoint.X;
                    currentLine.Y1 = startPoint.Y;
                    currentLine.X2 = startPoint.X;
                    currentLine.Y2 = startPoint.Y;
                }
            }
            else if (isDrawingCircle)
            {
                if (currentCircle != null)
                {
                    currentCircle.Width = 0;
                    currentCircle.Height = 0;
                    Canvas.SetLeft(currentCircle, startPoint.X);
                    Canvas.SetTop(currentCircle, startPoint.Y);
                }
            }
            else if (isDrawingRectangle)
            {
                if (currentRectangle != null)
                {
                    currentRectangle.Width = 0;
                    currentRectangle.Height = 0;
                    Canvas.SetLeft(currentRectangle, startPoint.X);
                    Canvas.SetTop(currentRectangle, startPoint.Y);
                }
            }
        }

        private void canvas_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            if (isDrawingLine)
            {
                if (currentLine != null)
                {
                    Point endPoint = e.GetPosition(canvas);
                    currentLine.X2 = endPoint.X;
                    currentLine.Y2 = endPoint.Y;
                }
            }
            else if (isDrawingCircle)
            {
                if (currentCircle != null)
                {
                    Point endPoint = e.GetPosition(canvas);
                    double radiusX = endPoint.X - startPoint.X;
                    double radiusY = endPoint.Y - startPoint.Y;
                    double radius = System.Math.Sqrt(radiusX * radiusX + radiusY * radiusY);

                    currentCircle.Width = 2 * radius;
                    currentCircle.Height = 2 * radius;

                    Canvas.SetLeft(currentCircle, startPoint.X - radius);
                    Canvas.SetTop(currentCircle, startPoint.Y - radius);
                }
            }
            else if (isDrawingRectangle)
            {
                if (currentRectangle != null)
                {
                    Point endPoint = e.GetPosition(canvas);
                    double width = endPoint.X - startPoint.X;
                    double height = endPoint.Y - startPoint.Y;

                    currentRectangle.Width = System.Math.Abs(width);
                    currentRectangle.Height = System.Math.Abs(height);

                    if (width < 0)
                    {
                        Canvas.SetLeft(currentRectangle, endPoint.X);
                    }
                    else
                    {
                        Canvas.SetLeft(currentRectangle, startPoint.X);
                    }

                    if (height < 0)
                    {
                        Canvas.SetTop(currentRectangle, endPoint.Y);
                    }
                    else
                    {
                        Canvas.SetTop(currentRectangle, startPoint.Y);
                    }
                }
            }
        }

        private void canvas_MouseMove(object sender, MouseEventArgs e)
        {
            if (isDrawingLine)
            {
                if (currentLine != null && e.LeftButton == MouseButtonState.Pressed)
                {
                    Point currentPoint = e.GetPosition(canvas);
                    currentLine.X2 = currentPoint.X;
                    currentLine.Y2 = currentPoint.Y;
                }
            }
            else if (isDrawingCircle)
            {
                if (currentCircle != null && e.LeftButton == MouseButtonState.Pressed)
                {
                    Point currentPoint = e.GetPosition(canvas);
                    double radiusX = currentPoint.X - startPoint.X;
                    double radiusY = currentPoint.Y - startPoint.Y;
                    double radius = System.Math.Sqrt(radiusX * radiusX + radiusY * radiusY);

                    currentCircle.Width = 2 * radius;
                    currentCircle.Height = 2 * radius;

                    Canvas.SetLeft(currentCircle, startPoint.X - radius);
                    Canvas.SetTop(currentCircle, startPoint.Y - radius);
                }
            }
            else if (isDrawingRectangle)
            {
                if (currentRectangle != null && e.LeftButton == MouseButtonState.Pressed)
                {
                    Point currentPoint = e.GetPosition(canvas);
                    double width = currentPoint.X - startPoint.X;
                    double height = currentPoint.Y - startPoint.Y;

                    currentRectangle.Width = System.Math.Abs(width);
                    currentRectangle.Height = System.Math.Abs(height);

                    if (width < 0)
                    {
                        Canvas.SetLeft(currentRectangle, currentPoint.X);
                    }
                    else
                    {
                        Canvas.SetLeft(currentRectangle, startPoint.X);
                    }

                    if (height < 0)
                    {
                        Canvas.SetTop(currentRectangle, currentPoint.Y);
                    }
                    else
                    {
                        Canvas.SetTop(currentRectangle, startPoint.Y);
                    }
                }
            }
        }
    }
}