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

namespace XHandler.Controls.DrawCanvas
{
    /// <summary>
    /// 椭圆
    /// </summary>
    public sealed class EllipseDrawTool : DrawGeometryBase
    {
        public EllipseDrawTool(DrawingCanvas drawingCanvas) : base(drawingCanvas)
        {
            this.DrawingToolType = DrawToolType.Ellipse;

            // 准备要处理的事件
            this.CanTouchDown = true;
        }

        #region 鼠标键盘事件

        public override Boolean OnKeyDown(Key key)
        {
            if (key != Key.LeftShift || !bottomRight.HasValue)
                return false;

            return OnTouchMove(bottomRight.Value);
        }

        public override Boolean OnKeyUp(Key key)
        {
            if (key != Key.LeftShift || !bottomRight.HasValue)
                return false;

            return OnTouchMove(bottomRight.Value);
        }

        public override Boolean OnTouchLeave(Point point)
        {
            //if (!bottomRight.HasValue)
            //    this.drawingCanvas.DeleteVisual(this);
            //else
            {
                Point centerPoint = new Point(point.X, point.Y);
                center = centerPoint;

                PathFigure myPathFigure = new PathFigure();//画第一条直线
                myPathFigure.StartPoint = new Point(point.X - 30, point.Y);
                LineSegment myLineSegment = new LineSegment();
                myLineSegment.Point = new Point(point.X + 30, point.Y);
                PathSegmentCollection myPathSegmentCollection = new PathSegmentCollection();
                myPathSegmentCollection.Add(myLineSegment);
                myPathFigure.Segments = myPathSegmentCollection;

                PathFigure myPathFigure2 = new PathFigure();//画第二条直线
                myPathFigure2.StartPoint = new Point(point.X, point.Y - 30);
                LineSegment myLineSegment2 = new LineSegment();
                myLineSegment2.Point = new Point(point.X, point.Y + 30);
                PathSegmentCollection myPathSegmentCollection2 = new PathSegmentCollection();
                myPathSegmentCollection2.Add(myLineSegment2);
                myPathFigure2.Segments = myPathSegmentCollection2;

                PathFigureCollection myPathFigureCollection = new PathFigureCollection();
                myPathFigureCollection.Add(myPathFigure);//添加画的线段
                myPathFigureCollection.Add(myPathFigure2);

                pathGeometry.Figures = myPathFigureCollection;

                FormattedText text = new FormattedText(this.ID.ToString(), CultureInfo.CurrentCulture, FlowDirection.LeftToRight, new Typeface("宋体"), 60, Brushes.Black);
                Geometry textGeometry = text.BuildGeometry(new Point(point.X + 40, point.Y - 40));

                GeometryGroup geometryGroup = new GeometryGroup();
                geometryGroup.Children.Add(geometry);
                geometryGroup.Children.Add(textGeometry);

                //geometry = geometry.GetFlattenedPathGeometry();
                geometry = geometryGroup.GetFlattenedPathGeometry();
                Draw();
                DrawingCanvas.ID++;
                nIndex++;
            }

            this.DrawingCanvas.DeleteWorkingDrawTool(this);

            this.IsFinish = true;

            this.CanTouchDown = false;
            this.CanTouchMove = false;
            this.CanTouchLeave = false;
            this.CanKeyDown = false;
            this.CanKeyUp = false;

            if (this.TouchId == 0 && this.DrawingCanvas.IsMouseCaptured)
                this.DrawingCanvas.ReleaseMouseCapture();

            return true;
        }

        public override Boolean OnTouchDown(Int32 touchId, Point point)
        {
            this.TouchId = touchId;

           // if (!topLeft.HasValue)
            {
                this.DrawingCanvas.AddWorkingDrawTool(this);

                this.pen = this.DrawingCanvas.Pen;

                topLeft = point;

                this.geometry = new PathGeometry();

                //var figure = new PathFigure { IsClosed = true };
                //pathGeometry.Figures.Add(figure);

                this.CanTouchMove = false;
                this.CanKeyDown = false;
                this.CanKeyUp = false;
                this.CanTouchUp = true;
                //if (this.TouchId != 0 || !this.drawingCanvas.CaptureMouse())
                    this.CanTouchLeave = true;

                this.DrawingCanvas.AddVisual(this);
            }
            //else
            //return OnTouchLeave(point);

            return true;
        }

        public override Boolean OnTouchMove(Point point)
        {
            var dc = this.RenderOpen();

            var startPoint = topLeft.Value;

            if (Keyboard.IsKeyDown(Key.LeftShift))
            {
                var len = Math.Min(Math.Abs(point.X - startPoint.X), Math.Abs(point.Y - startPoint.Y));
                point = new Point(startPoint.X + (point.X > startPoint.X ? len : -len), startPoint.Y + (point.Y > startPoint.Y ? len : -len));
            }

            if ((startPoint - point).Length <= pen.Thickness)
            {
                dc.Close();
                return true;
            }

            bottomRight = point;

            radiusX = (point.X - startPoint.X) / 2;
            radiusY = (point.Y - startPoint.Y) / 2;
            Point centerPoint= new Point(startPoint.X + radiusX, startPoint.Y + radiusY);
            center = centerPoint;

            radiusX = Math.Abs(radiusX);
            radiusY = Math.Abs(radiusY);

            dc.DrawEllipse(null, pen, center, radiusX, radiusY);
            dc.Close();

            return true;
        }

        #endregion

        #region 序列化

        public override DrawGeometrySerializerBase ToSerializer()
        {
            var serializer = new DrawEllipseSerializer
            {
                Color = ((SolidColorBrush)pen.Brush).Color,
                StrokeThickness = pen.Thickness,
                Geometry = geometry.ToString()
            };

            if (geometry.Transform != null)
                serializer.Matrix = geometry.Transform.Value;

            return serializer;
        }

        public override void DeserializeFrom(DrawGeometrySerializerBase serializer)
        {
            this.pen = new Pen(new SolidColorBrush(serializer.Color), serializer.StrokeThickness);

            this.geometry = Geometry.Parse(serializer.Geometry).GetFlattenedPathGeometry();
            this.geometry.Transform = new TranslateTransform(serializer.Matrix.OffsetX, serializer.Matrix.OffsetY);

            this.IsFinish = true;

            this.Draw();
        }

        #endregion

        #region 字段

        private Point? topLeft, bottomRight;

        private static int nIndex = 0;
        public Point center { get; set; }
        //public int ID = 1;
        public Double radiusX { get; set; }
        public Double radiusY { get; set; }
        #endregion
    }
}