using BeDesignerSCADA.Controls;
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.Documents;
using System.Windows.Input;
using System.Windows.Media;

namespace BeDesignerSCADA.Adorners
{
    internal class SelectionAdorner : Adorner
    {
        public SelectionAdorner(UIElement adornedEIeent) : base(adornedEIeent) { }

        protected override void OnRender(DrawingContext drawingContext)
        {
            base.OnRender(drawingContext);
            Rect adornerRect = new Rect(AdornedElement.DesiredSize);
            SolidColorBrush renderBrush = Brushes.Transparent;
            Pen renderPen1 = new Pen(new SolidColorBrush(Colors.Tomato), 1);
            Pen renderPen = new Pen(new SolidColorBrush(Colors.Tomato), 1);
            renderPen1.DashStyle = new DashStyle(new List<double>() { 6, 4 }, 4);

            //1.绘制边框
            drawingContext.DrawRectangle(renderBrush, renderPen1, new Rect(adornerRect.TopLeft.X, adornerRect.TopLeft.Y, adornerRect.Width, adornerRect.Height));
            //2.绘制拖动正方形
            // Draw a circle at each corner.
            drawingContext.DrawRectangle(renderBrush, renderPen, new Rect(adornerRect.TopLeft.X - 2.5, adornerRect.TopLeft.Y - 2.5, 5, 5));
            drawingContext.DrawRectangle(renderBrush, renderPen, new Rect(adornerRect.TopRight.X - 2.5, adornerRect.TopRight.Y - 2.5, 5, 5));
            drawingContext.DrawRectangle(renderBrush, renderPen, new Rect(adornerRect.BottomLeft.X - 2.5, adornerRect.BottomLeft.Y - 2.5, 5, 5));
            drawingContext.DrawRectangle(renderBrush, renderPen, new Rect(adornerRect.BottomRight.X - 2.5, adornerRect.BottomRight.Y - 2.5, 5, 5));
            //3.绘制4个中心正方形
            drawingContext.DrawRectangle(renderBrush, renderPen,
                new Rect(adornerRect.TopLeft.X + adornerRect.Width / (double)2 - 2.5, adornerRect.TopLeft.Y - 2.5, 5, 5));
            drawingContext.DrawRectangle(renderBrush, renderPen,
                new Rect(adornerRect.TopRight.X - 2.5, adornerRect.TopRight.Y + adornerRect.Height / (double)2 - 2.5, 5, 5));
            drawingContext.DrawRectangle(renderBrush, renderPen,
                new Rect(adornerRect.BottomLeft.X - 2.5, adornerRect.BottomLeft.Y - adornerRect.Height / (double)2 - 2.5, 5, 5));
            drawingContext.DrawRectangle(renderBrush, renderPen,
                new Rect(adornerRect.BottomRight.X - adornerRect.Width / (double)2 - 2.5, adornerRect.BottomRight.Y - 2.5, 5, 5));

            MouseDown += SelectionAdorner_MouseDown;
            MouseMove += SelectionAdorner_MouseMove;
            MouseUp += SelectionAdorner_MouseUp;
            ResourceDictionary languageResDic = new ResourceDictionary();
            languageResDic.Source = new Uri(@"/BeDesignerSCADA;component/Themes/Styles.xaml", UriKind.RelativeOrAbsolute);
            this.Resources.MergedDictionaries.Add(languageResDic);
            ContextMenu = FindResource("AdornerRightMenu") as ContextMenu;
            Tag = CanvasPanel.GetParentObject<CanvasPanel>(AdornedElement);

            this.Focus();
            this.SelectionAdorner_MouseDown(this, null);
            this.SelectionAdorner_MouseMove(this, null);
        }

        private void SelectionAdorner_MouseUp(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            ReleaseMouseCapture();
            CanvasPanel.GetParentObject<CanvasPanel>(AdornedElement).ClearAlignLine();
        }

        /// <summary>
        /// 鼠标最后一次按下位置
        /// </summary>
        Point lastPoint = new Point();
        /// <summary>
        /// 鼠标在控件中的位置
        /// </summary>
        public MousePos mousePos;
        double tempX = 0d;
        double tempY = 0d;
        double movePx = 0d;
        /// <summary>
        /// 改变鼠标状态，鼠标在控件上，下，左，右，左上，右上，左下，右下，向上不同的光标
        /// </summary>
        private void SetCursor()
        {
            Rect adornerRect = new Rect(AdornedElement.DesiredSize);
            double _left = CanvasPanel.GetLeft(AdornedElement);
            double _top = CanvasPanel.GetTop(AdornedElement);
            var DQPoint = Mouse.GetPosition(CanvasPanel.GetParentObject<CanvasPanel>(AdornedElement));
            if (DQPoint.X >= (adornerRect.TopLeft.X - 2.5 + _left) && DQPoint.X <= (adornerRect.TopLeft.X + 2.5 + _left) && DQPoint.Y >= (adornerRect.TopLeft.Y - 2.5 + _top) && DQPoint.Y <= (adornerRect.TopLeft.Y + 2.5 + _top))
            {
                //左上
                this.Cursor = Cursors.SizeNWSE; mousePos = MousePos.LeftTop;
            }
            else if (DQPoint.X >= (adornerRect.TopRight.X - 2.5 + _left) && DQPoint.X <= (adornerRect.TopRight.X + 2.5 + _left) && DQPoint.Y >= (adornerRect.TopRight.Y - 2.5 + _top) && DQPoint.Y <= (adornerRect.TopRight.Y + 2.5 + _top))
            {
                //右上
                this.Cursor = Cursors.SizeNESW; mousePos = MousePos.RightTop;
            }
            else if (DQPoint.X >= (adornerRect.BottomLeft.X - 2.5 + _left) && DQPoint.X <= (adornerRect.BottomLeft.X + 2.5 + _left) && DQPoint.Y >= (adornerRect.BottomLeft.Y - 2.5 + _top) && DQPoint.Y <= (adornerRect.BottomLeft.Y + 2.5 + _top))
            {
                //左下
                this.Cursor = Cursors.SizeNESW; mousePos = MousePos.LeftBottom ;
            }
            else if (DQPoint.X >= (adornerRect.BottomRight.X - 2.5 + _left) && DQPoint.X <= (adornerRect.BottomRight.X + 2.5 + _left) && DQPoint.Y >= (adornerRect.BottomRight.Y - 2.5 + _top) && DQPoint.Y <= (adornerRect.BottomRight.Y + 2.5 + _top))
            {
                //右下
                this.Cursor = Cursors.SizeNWSE; mousePos = MousePos.RightBottom;
            }
            else if (DQPoint.X >= (adornerRect.TopLeft.X + adornerRect.Width / (double)2 - 2.5 + _left) && DQPoint.X <= (adornerRect.TopLeft.X + adornerRect.Width / (double)2 + 2.5 + _left) && DQPoint.Y >= (adornerRect.TopLeft.Y - 2.5 + _top) && DQPoint.Y <= (adornerRect.TopLeft.Y + 2.5 + _top))
            {
                //上中
                this.Cursor = Cursors.SizeNS; mousePos = MousePos.Top;
            }
            else if (DQPoint.X >= (adornerRect.BottomRight.X - adornerRect.Width / (double)2 - 2.5 + _left) && DQPoint.X <= (adornerRect.BottomRight.X - adornerRect.Width / (double)2 + 2.5 + _left) && DQPoint.Y >= (adornerRect.BottomRight.Y - 2.5 + _top) && DQPoint.Y <= (adornerRect.BottomRight.Y + 2.5 + _top))
            {
                //下中
                this.Cursor = Cursors.SizeNS; mousePos = MousePos.Bottom;
            }
            else if (DQPoint.X >= (adornerRect.TopRight.X - 2.5 + _left) && DQPoint.X <= (adornerRect.TopRight.X + 2.5 + _left) && DQPoint.Y >= (adornerRect.TopRight.Y + adornerRect.Height / (double)2 - 2.5 + _top) && DQPoint.Y <= (adornerRect.TopRight.Y + adornerRect.Height / (double)2 + 2.5 + _top))
            {
                //右中
                this.Cursor = Cursors.SizeWE; mousePos = MousePos.Right;
            }
            else if (DQPoint.X >= (adornerRect.BottomLeft.X - 2.5 + _left) && DQPoint.X <= (adornerRect.BottomLeft.X + 2.5 + _left) && DQPoint.Y >= (adornerRect.BottomLeft.Y - adornerRect.Height / (double)2 - 2.5 + _top) && DQPoint.Y <= (adornerRect.BottomLeft.Y - adornerRect.Height / (double)2 + 2.5 + _top))
            {
                //左中
                this.Cursor = Cursors.SizeWE; mousePos = MousePos.Left;
            }
            else
            {
                this.Cursor = Cursors.Arrow; mousePos = MousePos.None;
            }
        }


        private void SelectionAdorner_MouseMove(object sender, System.Windows.Input.MouseEventArgs e)
        {
            if (Mouse.LeftButton != MouseButtonState.Pressed 
                && Mouse.MiddleButton != MouseButtonState.Pressed 
                && Mouse.RightButton != MouseButtonState.Pressed)//鼠标没有按下,改变鼠标状态 
            {
                SetCursor();
            }

            if (this.Cursor == Cursors.Arrow && Mouse.LeftButton == MouseButtonState.Pressed)//移动控件
            {
                if (lastPoint.X == 0 && lastPoint.Y == 0)
                {
                    return;
                }

                CaptureMouse();
                var nowPoint = Mouse.GetPosition(CanvasPanel.GetParentObject<CanvasPanel>(AdornedElement));
                double offsetX = nowPoint.X - lastPoint.X;
                double offsetY = nowPoint.Y - lastPoint.Y;
                lastPoint = nowPoint;

                tempX += offsetX;
                tempY += offsetY;

                var canvas = CanvasPanel.GetParentObject<CanvasPanel>(AdornedElement);
                movePx = canvas.GridPxiel;

                if (Math.Abs(tempX) >= movePx)
                {
                    offsetX = Math.Round(tempX / movePx) * movePx;
                    tempX -= offsetX;
                    canvas.MoveControls(offsetX, 0);
                }

                if (Math.Abs(tempY) >= movePx)
                {
                    offsetY = Math.Round(tempY / movePx) * movePx;
                    tempY -= offsetY;
                    canvas.MoveControls(0, offsetY);
                }
            }
            else if (this.Cursor != Cursors.Arrow && Mouse.LeftButton == MouseButtonState.Pressed)
            {
                CaptureMouse();
                //lastPoint 最后一次鼠标按下位置   nowPonit 鼠标当前位置 mousePos 鼠标在控件中的位置
                var nowPoint = Mouse.GetPosition(CanvasPanel.GetParentObject<CanvasPanel>(AdornedElement));
                CanvasPanel.GetParentObject<CanvasPanel>(AdornedElement).ReCtrlSize(lastPoint, nowPoint, mousePos);
                lastPoint = nowPoint;
            }
            else if (Mouse.MiddleButton == MouseButtonState.Pressed)//中间同步拖拽控件大小
            {
                CaptureMouse();
                var nowPoint = Mouse.GetPosition(CanvasPanel.GetParentObject<CanvasPanel>(AdornedElement));
                int offsetX = (int)(nowPoint.X - lastPoint.X);
                int offsetY = (int)(nowPoint.Y - lastPoint.Y);
                CanvasPanel.GetParentObject<CanvasPanel>(AdornedElement).ZoomControls(offsetX, offsetY);
                lastPoint = nowPoint;
            }
        }

        private void SelectionAdorner_MouseDown(object sender, MouseButtonEventArgs e)
        {
            var canv = CanvasPanel.GetParentObject<CanvasPanel>(AdornedElement);
            lastPoint = Mouse.GetPosition(canv);
            Keyboard.Focus(canv);

            if (Keyboard.Modifiers == ModifierKeys.Control && e != null)
            {
                var layer = AdornerLayer.GetAdornerLayer(AdornedElement);
                var arr = layer.GetAdorners(AdornedElement);
                if (canv.SelectedItems.Contains(AdornedElement))
                {
                    canv.SelectedItems.Remove(AdornedElement as FrameworkElement);
                    canv.RefreshSelection();
                }
            }
        }
    }

    /// <summary>
    /// 鼠标在控件中的位置
    /// </summary>
    public enum MousePos
    {
        None,
        Top,
        Right,
        Bottom,
        Left,
        LeftTop,
        LeftBottom,
        RightTop,
        RightBottom
    }
}