using FlowChartModule.绘制模块;
using Prism.Ioc;
using System;
using System.Collections.Generic;
using System.Diagnostics;
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;
using static System.Formats.Asn1.AsnWriter;

namespace FlowChartModule.Views
{
    /// <summary>
    /// ModuleView.xaml 的交互逻辑
    /// </summary>
    public partial class ModuleView : UserControl
    {

        public Element _element;
        public DrawModule drawModule;
        double scale=1;
        private Point _mousedownPoint;
        private  bool _isMouseDown=false;
        
        public ModuleView(IContainerProvider containerProvider)
        {
            InitializeComponent();
            drawModule=containerProvider.Resolve<DrawModule>();
            drawModule.Canvas = this.DrawingContainer;
            this.MouseUp += ModuleView_MouseUp;
            //Pantransform.X = -10000;
            //Pantransform.Y = -10000;
        }

        private void ModuleView_MouseUp(object sender, MouseButtonEventArgs e)
        {
          
            ParentCanvasGrid.ReleaseMouseCapture();
            Connection_Point._isMouseDown = false;
            _isMouseDown = false;
            drawModule.DrawRectangle(e.GetPosition(this.DrawingContainer));
            if ( drawModule.CurrentFlowClickElement != null ) 
            {

                drawModule.CurrentFlowClickElement.connection_Lines.Remove(drawModule.Connection_Line);
                DrawingContainer.Children.Remove(drawModule.Connection_Line.path);
            }
            drawModule.CurrentFlowClickElement = null;
            drawModule.isMouseDown = false;
            //drawModule.Connection_Line
        }

        private void Window_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
        {
            if ( Keyboard.IsKeyDown(Key.LeftCtrl) )
            {
                if ( e.Delta < 0 )
                {
                    scale -= 0.01;
                }
                else
                {
                    scale += 0.01;
                }
                // scale += (double)e.Delta / 35000;
                ScaleTransform transfrom = new ScaleTransform();
                transfrom.ScaleX = transfrom.ScaleY = scale;
                this.DrawingContainer.RenderTransform = transfrom;

            }
        }  



        private Pen CreateAndFreezePen()
        {
            // 创建Pen
            Pen pen = new Pen(Brushes.Black, 1);

            // 冻结Pen
            if ( pen.CanFreeze )
            {
                pen.Freeze();
            }

            return pen;
        }
        
        private void ParentCanvasGrid_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (!drawModule.isMouseDown)
            {
                _isMouseDown = true;
                _mousedownPoint = e.GetPosition(this.ParentCanvasGrid);
                ParentCanvasGrid.CaptureMouse();
            }
            if ( drawModule.CurrentFlowClickElement != null && Connection_Point._isMouseDown )
            {

                drawModule.Connection_Line= new Connection_Line(DrawingContainer);
                Point position;
                Point position1 =   drawModule.CurrentFlowClickElement.left.ellipse.TransformToVisual(this.DrawingContainer).Transform(new Point(0, 0));
                Point position2 =   drawModule.CurrentFlowClickElement.right.ellipse.TransformToVisual(this.DrawingContainer).Transform(new Point(0, 0));
                Point position3 =   drawModule.CurrentFlowClickElement.up.ellipse.TransformToVisual(this.DrawingContainer).Transform(new Point(0, 0));
                Point position4 =   drawModule.CurrentFlowClickElement.down.ellipse.TransformToVisual(this.DrawingContainer).Transform(new Point(0, 0));
                Point position5= e.GetPosition(this.DrawingContainer);

                bool isHas = false;
                if ( Math.Abs(position1.X - position5.X) < 40 && Math.Abs(position1.Y - position5.Y) < 40 && !isHas ) 
                {
                    isHas = true;
                    position =new Point(position1.X+6,position1.Y+6);
                }
                if ( Math.Abs(position2.X - position5.X) < 40 && Math.Abs(position2.Y - position5.Y) < 40 && !isHas )
                {
                    isHas = true;
                    position = new Point(position2.X + 6, position2.Y + 6);
                }
                if ( Math.Abs(position3.X - position5.X) < 40 && Math.Abs(position3.Y - position5.Y) < 40 && !isHas )
                {
                    isHas = true;
                    position = new Point(position3.X + 6, position3.Y + 6);
                }
                if ( Math.Abs(position4.X - position5.X) < 40 && Math.Abs(position4.Y - position5.Y) < 40 && !isHas )
                {
                    isHas = true;
                    position = new Point(position4.X + 6, position4.Y + 6);
                }
                
                if ( isHas ) {
                    drawModule.Connection_Line.curveModel.StartPoint = position;
                    drawModule.Connection_Line.curveModel.EndPoint = position;
                    drawModule.Connection_Line.Drewbezier(this.DrawingContainer);
                    drawModule.Connection_Line.Startelement = drawModule.CurrentFlowClickElement;
                    drawModule.CurrentFlowClickElement.connection_Lines.Add(drawModule.Connection_Line);
                }
                
            }
        }

        private void ParentCanvasGrid_MouseMove(object sender, MouseEventArgs e)
        {
            if (_isMouseDown)
            {
                Point point=e.GetPosition(ParentCanvasGrid);
                Pantransform.X -= _mousedownPoint.X - point.X;
                Pantransform.Y -= _mousedownPoint.Y - point.Y;
                _mousedownPoint = point;  
            }
           
            
            if ( drawModule.CurrentFlowClickElement != null &&Connection_Point._isMouseDown)
            {

                drawModule.Connection_Line.curveModel.EndPoint = e.GetPosition(this.DrawingContainer);
                drawModule.Connection_Line.DrewbezierRef(this.DrawingContainer);
                
            }
        }
    }
}