using ComPDFKit.Import;
using ComPDFKit.PDFAnnotation;
using ComPDFKit.PDFAnnotation.Form;
using ComPDFKit.Tool.DrawTool;
using ComPDFKit.Tool.Help;
using ComPDFKit.Tool.UndoManger;
using ComPDFKitViewer;
using ComPDFKitViewer.BaseObject;
using ComPDFKitViewer.Helper;
using ComPDFKitViewer.Layer;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;

namespace ComPDFKit.Tool
{
    public partial class CPDFViewerTool
    {
        private class AnnotSelectAreaData
        {
            public Point HitAreaPos { get; set; }
            public Point MoveAreaPos { get; set; }
            public Rect HitAreaBound { get; set; }
            public int HitPageIndex { get; set; } = -1;
        }
        private int AnnotSelectorIndex { get; set; } = -1;
        private AnnotSelector Selector { get; set; }
        private AnnotSelectAreaData AreaDrawData { get; set; } = new AnnotSelectAreaData();
        private AnnotSelectAreaData AreaMoveData { get; set; } = new AnnotSelectAreaData();
        private bool DrawSelect { get; set; } = true;
        private bool AllowMultiSelect { get; set; }
        private bool AllowAreaSelect { get; set; }
        private bool IsMoved { get; set; } = false;
        private Point OffsetPos { get; set; } = new Point(0, 0);
        private List<AnnotParam> AnnotParamList { get; set; } = new List<AnnotParam>();
        private void AnnotSelectInsert()
        {
            Selector = new AnnotSelector();
            Selector.PDFViewer = PDFViewer;
            int annotViewindex = PDFViewer.GetMaxViewIndex();
            PDFViewer.InsertView(annotViewindex, Selector);
            AnnotSelectorIndex = Selector.GetResTag();
        }

        private void AnnotSelectUpdate()
        {
            if (!AllowMultiSelect)
            {
                return;
            }
            if (Selector == null || Selector.SelectAnnots == null)
            {
                return;
            }
            if (PDFViewer == null || PDFViewer.CurrentRenderFrame == null)
            {
                Selector?.ClearItem();
                Selector?.CleanDraw();
                return;
            }
            List<AnnotData> annotDatas = PDFViewer.CurrentRenderFrame.AnnotDataList;
            if (annotDatas == null || annotDatas.Count == 0)
            {
                return;
            }
            foreach (AnnotData checkItem in Selector.SelectAnnots.ToList())
            {
                AnnotData saveItem = annotDatas.Where(x => x.PageIndex == checkItem.PageIndex && x.AnnotIndex == checkItem.AnnotIndex).FirstOrDefault();
                if (saveItem != null)
                {
                    Selector.RemoveItem(checkItem);
                    Selector.AddItem(saveItem);
                }
            }
        }

        public void SetAnnotAllowMultiSelect(bool isAllow) 
        {
            AllowMultiSelect = isAllow;
            AllowAreaSelect = isAllow;
        }

        private void AnnotSelectDraw()
        {
            if (!AllowMultiSelect)
            {
                return;
            }
            if (DrawSelect == false)
            {
                return;
            }
            if (Selector?.GetSelectCount() > 1)
            {
                Selector?.Draw();
                return;
            }
            Selector?.CleanDraw();
        }

        private void AnnotSelectAddItem(AnnotData annotData, bool clean = true)
        {
            if (!AllowMultiSelect || annotData == null)
            {
                return;
            }

            if (Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl))
            {
                if (Selector?.HasItem(annotData) == true)
                {
                    if (Selector?.GetSelectCount() != 1)
                    {
                        Selector?.RemoveItem(annotData);
                    }
                }
                else
                {
                    Selector?.AddItem(annotData);
                }
                return;
            }

            if (clean)
            {
                Selector?.ClearItem();
                Selector?.AddItem(annotData);
            }
        }

        private void AnnotSelectAreaHit()
        {
            if (!AllowMultiSelect)
            {
                return;
            }
            AreaDrawData.HitPageIndex = -1;
            if (PDFViewer == null || Selector == null || !AllowAreaSelect)
            {
                return;
            }
            AreaDrawData.HitAreaPos = Mouse.GetPosition(PDFViewer);
            AreaDrawData.MoveAreaPos = AreaDrawData.HitAreaPos;
            PDFViewer.GetPointPageInfo(AreaDrawData.HitAreaPos, out int pageIndex, out Rect paintRect, out Rect pageBound);
            if (pageIndex >= 0)
            {
                AreaDrawData.HitPageIndex = pageIndex;
                AreaDrawData.HitAreaBound = pageBound;
                PDFViewer.CanHorizontallyScroll = false;
                PDFViewer.CanVerticallyScroll = false;
                PDFViewer.EnableZoom(false);
                DrawSelect = false;
            }
        }

        private void AnnotSelectMoveHit()
        {
            if (!AllowMultiSelect)
            {
                return;
            }
            AreaMoveData.HitPageIndex = -1;
            if (PDFViewer == null || Selector == null)
            {
                return;
            }
            AreaMoveData.HitAreaPos = Mouse.GetPosition(PDFViewer);
            AreaMoveData.MoveAreaPos = AreaMoveData.HitAreaPos;
            PDFViewer.GetPointPageInfo(AreaMoveData.HitAreaPos, out int pageIndex, out Rect paintRect, out Rect pageBound);
            if (pageIndex >= 0)
            {
                AreaMoveData.HitPageIndex = pageIndex;
                AreaMoveData.HitAreaBound = pageBound;
            }
        }

        private void AnnotSelectAreaDraw()
        {
            if (!AllowMultiSelect)
            {
                return;
            }
            if (AreaDrawData.HitPageIndex < 0 || PDFViewer == null || Selector == null)
            {
                return;
            }
            AreaDrawData.MoveAreaPos = Mouse.GetPosition(PDFViewer);
            Rect moveRect = new Rect(AreaDrawData.HitAreaPos, AreaDrawData.MoveAreaPos);
            moveRect.Intersect(AreaDrawData.HitAreaBound);
            DrawingContext drawDC = Selector.RenderOpen();
            drawDC.DrawRectangle(Selector.DrawBrush, Selector.DrawPen, moveRect);
            drawDC.Close();
        }

        private bool AnnotSelectAreaSelect(bool onlyWidget = false, bool onlyAnnot = false)
        {
            if (!AllowMultiSelect)
            {
                return false;
            }

            if (AreaDrawData.HitPageIndex < 0 || PDFViewer == null || Selector == null)
            {
                return false;
            }

            PDFViewer.CanHorizontallyScroll = true;
            PDFViewer.CanVerticallyScroll = true;
            PDFViewer.EnableZoom(true);
            Selector.ClearItem();
            Selector.CleanDraw();
            AreaDrawData.HitPageIndex = -1;
            DrawSelect = true;

            if (PDFViewer.CurrentRenderFrame != null && PDFViewer.CurrentRenderFrame.AnnotDataList != null)
            {
                Rect areaRect = new Rect(AreaDrawData.HitAreaPos, AreaDrawData.MoveAreaPos);
                areaRect.Intersect(AreaDrawData.HitAreaBound);
                foreach (AnnotData checkItem in PDFViewer.CurrentRenderFrame.AnnotDataList)
                {
                    if (onlyWidget && checkItem.AnnotType != C_ANNOTATION_TYPE.C_ANNOTATION_WIDGET)
                    {
                        continue;
                    }
                    if (onlyAnnot && checkItem.AnnotType == C_ANNOTATION_TYPE.C_ANNOTATION_WIDGET)
                    {
                        continue;
                    }

                    if (areaRect.IntersectsWith(checkItem.PaintRect))
                    {
                        Selector.AddItem(checkItem);
                    }
                }

                Selector.Draw();
            }
            return true;
        }

        private BaseAnnot AnnotSelectGetAnnot()
        {
            if (PDFViewer != null && Selector != null && Selector.SelectAnnots != null && Selector.SelectAnnots.Count == 1)
            {
                AnnotData annotData = Selector.SelectAnnots[0];
                BaseLayer checkLayer = PDFViewer.GetViewForTag(PDFViewer.GetAnnotViewTag());
                if (checkLayer != null && checkLayer is AnnotLayer)
                {
                    AnnotLayer annotLayer = (AnnotLayer)checkLayer;
                    return annotLayer.GetAnnotForIndex(annotData.PageIndex, annotData.AnnotIndex);
                }
            }

            return null;
        }

        private int AnnotSelectGetCount()
        {
            if (Selector != null)
            {
                return Selector.GetSelectCount();
            }
            return 0;
        }

        private void AnnotSelectAreaHover()
        {
            if (!AllowMultiSelect)
            {
                return;
            }

            if (PDFViewer == null || Selector == null || Selector.GetSelectCount() < 2)
            {
                return;
            }

            Point movePos = Mouse.GetPosition(PDFViewer);
            PointControlType hitPoint = Selector.GetHitControlIndex(movePos);
            Cursor oldCursor = this.Cursor;
            Cursor newCursor = this.Cursor;

            switch (hitPoint)
            {
                case PointControlType.LeftTop:
                case PointControlType.RightBottom:
                    newCursor = Cursors.SizeNWSE;
                    break;
                case PointControlType.LeftMiddle:
                case PointControlType.RightMiddle:
                    newCursor = Cursors.SizeWE;
                    break;
                case PointControlType.LeftBottom:
                case PointControlType.RightTop:
                    newCursor = Cursors.SizeNESW;
                    break;
                case PointControlType.MiddlBottom:
                case PointControlType.MiddleTop:
                    newCursor = Cursors.SizeNS;
                    break;
                case PointControlType.Body:
                    newCursor = Cursors.SizeAll;
                    break;
                default:
                    newCursor = Cursors.Arrow;
                    break;
            }

            if (oldCursor != newCursor)
            {
                PDFViewer.Cursor = newCursor;
                this.Cursor = newCursor;
            }
        }

        private bool AnnotSelectAreaHitTest()
        {
            if (!AllowMultiSelect)
            {
                return false;
            }

            if (PDFViewer == null || Selector == null || Selector.GetSelectCount() < 2)
            {
                return false;
            }

            Point movePos = Mouse.GetPosition(PDFViewer);
            HitTestResult hitResult = VisualTreeHelper.HitTest(PDFViewer, movePos);
            if (hitResult != null && hitResult.VisualHit is AnnotSelector)
            {
                return true;
            }
            return false;
        }

        private bool AnnotSelectMoveDraw()
        {
            if (!AllowMultiSelect)
            {
                return false;
            }

            if (AreaMoveData.HitPageIndex < 0 || PDFViewer == null || Selector == null || Selector.GetSelectCount() < 2)
            {
                return false;
            }
            if (Mouse.LeftButton != MouseButtonState.Pressed)
            {
                return false;
            }

            Point movePos = Mouse.GetPosition(PDFViewer);
            Point moveOffset = new Point(movePos.X - AreaMoveData.HitAreaPos.X, movePos.Y - AreaMoveData.HitAreaPos.Y);
            PointControlType hitPointType = Selector.GetHitControlIndex(AreaMoveData.HitAreaPos);

            switch (hitPointType)
            {
                default:
                case PointControlType.None:
                    return false;
                case PointControlType.Body:
                    AnnotSelectMove();
                    return true;
                case PointControlType.LeftTop:
                case PointControlType.LeftMiddle:
                case PointControlType.LeftBottom:
                case PointControlType.MiddlBottom:
                case PointControlType.RightBottom:
                case PointControlType.RightMiddle:
                case PointControlType.RightTop:
                case PointControlType.MiddleTop:
                    if (CanResize(hitPointType, moveOffset, Selector.GetOutBoundRect(), AreaMoveData.HitAreaBound))
                    {
                        AnnotSelectResize(hitPointType, moveOffset, Selector.GetOutBoundRect(), AreaMoveData.HitAreaBound);
                    }
                    return true;
            }
        }

        private void AnnotSelectMove()
        {
            Point movePos = Mouse.GetPosition(PDFViewer);
            Vector offset = movePos - AreaMoveData.HitAreaPos;

            Rect boundRect = Selector.GetOutBoundRect();
            Point boundCenter = new Point(boundRect.Left + boundRect.Width / 2, boundRect.Top + boundRect.Height / 2);
            Point moveCenter = new Point(boundCenter.X + offset.X, boundCenter.Y + offset.Y);

            moveCenter.X = Math.Max(AreaMoveData.HitAreaBound.Left + boundRect.Width / 2, moveCenter.X);
            moveCenter.X = Math.Min(AreaMoveData.HitAreaBound.Right - boundRect.Width / 2, moveCenter.X);
            moveCenter.Y = Math.Max(AreaMoveData.HitAreaBound.Top + boundRect.Height / 2, moveCenter.Y);
            moveCenter.Y = Math.Min(AreaMoveData.HitAreaBound.Bottom - boundRect.Height / 2, moveCenter.Y);

            Rect moveRect = new Rect(moveCenter.X - boundRect.Width / 2, moveCenter.Y - boundRect.Height / 2, boundRect.Width, boundRect.Height);
            OffsetPos = new Point(moveCenter.X - boundCenter.X, moveCenter.Y - boundCenter.Y);

            DrawingContext drawDC = Selector.RenderOpen();
            Selector.DrawOutBound(drawDC);
            Selector.DrawIndividual(drawDC);
            Selector.DrawControlPoint(drawDC);
            drawDC.DrawRectangle(Selector.DrawBrush, Selector.DrawPen, moveRect);
            foreach (AnnotData checkItem in Selector.SelectAnnots)
            {
                Rect childRect = new Rect(checkItem.PaintRect.X + OffsetPos.X, checkItem.PaintRect.Y + OffsetPos.Y, checkItem.PaintRect.Width, checkItem.PaintRect.Height);
                drawDC.DrawRectangle(Selector.DrawBrush, Selector.DrawPen, childRect);
            }
            drawDC.Close();
        }

        private void AnnotSelectResize(PointControlType controlType, Point moveOffset, Rect maxRect, Rect boundRect)
        {
            if (maxRect == Rect.Empty || maxRect.Width == 0 || maxRect.Height == 0)
            {
                return;
            }

            double ratioX = maxRect.Width > 0 ? maxRect.Height / maxRect.Width : 1;
            double ratioY = maxRect.Height > 0 ? maxRect.Width / maxRect.Height : 1;
            Point offsetPos = moveOffset;

            switch (controlType)
            {
                case PointControlType.LeftTop:
                case PointControlType.RightBottom:
                    offsetPos = new Point(moveOffset.X, Math.Abs(moveOffset.X) * ratioX * (moveOffset.X < 0 ? -1 : 1));
                    break;
                case PointControlType.LeftBottom:
                case PointControlType.RightTop:
                    offsetPos = new Point(moveOffset.X, Math.Abs(moveOffset.X) * ratioX * (moveOffset.X < 0 ? 1 : -1));
                    break;
                case PointControlType.LeftMiddle:
                    offsetPos = new Point(moveOffset.X, Math.Abs(moveOffset.X) * ratioX * (moveOffset.X < 0 ? 1 : -1));
                    break;
                case PointControlType.RightMiddle:
                    offsetPos = new Point(moveOffset.X, Math.Abs(moveOffset.X) * ratioX * (moveOffset.X < 0 ? -1 : 1));
                    break;
                case PointControlType.MiddlBottom:
                    offsetPos = new Point(Math.Abs(moveOffset.Y) * ratioY * (moveOffset.Y < 0 ? 1 : -1), moveOffset.Y);
                    break;
                case PointControlType.MiddleTop:
                    offsetPos = new Point(Math.Abs(moveOffset.Y) * ratioY * (moveOffset.Y < 0 ? -1 : 1), moveOffset.Y);
                    break;
            }
            OffsetPos = offsetPos;
            double left = maxRect.Left;
            double top = maxRect.Top;
            double right = maxRect.Right;
            double bottom = maxRect.Bottom;

            switch (controlType)
            {
                case PointControlType.LeftTop://左上
                    left += offsetPos.X;
                    top += offsetPos.Y;
                    break;
                case PointControlType.LeftMiddle://左中
                    left += offsetPos.X;
                    top -= offsetPos.Y / 2;
                    bottom += offsetPos.Y / 2;
                    break;
                case PointControlType.LeftBottom://左下
                    left += offsetPos.X;
                    bottom += offsetPos.Y;
                    break;
                case PointControlType.MiddlBottom://中下
                    bottom += offsetPos.Y;
                    left += offsetPos.X / 2;
                    right -= offsetPos.X / 2;
                    break;
                case PointControlType.RightBottom://右下
                    right += offsetPos.X;
                    bottom += offsetPos.Y;
                    break;
                case PointControlType.RightMiddle://右中
                    right += offsetPos.X;
                    top -= offsetPos.Y / 2;
                    bottom += offsetPos.Y / 2;
                    break;
                case PointControlType.RightTop://右上
                    right += offsetPos.X;
                    top += offsetPos.Y;
                    break;
                case PointControlType.MiddleTop://中上
                    top += offsetPos.Y;
                    left += offsetPos.X / 2;
                    right -= offsetPos.X / 2;
                    break;
                default:
                    break;
            }

            Rect newRect = new Rect(new Point(left, top), new Point(right, bottom));

            DrawingContext drawDC = Selector.RenderOpen();
            Selector.DrawOutBound(drawDC);
            Selector.DrawIndividual(drawDC);
            Selector.DrawControlPoint(drawDC);
            drawDC.DrawRectangle(Selector.DrawBrush, Selector.DrawPen, newRect);

            foreach (AnnotData checkItem in Selector.SelectAnnots)
            {
                double distanceLeft = checkItem.PaintRect.Left - maxRect.Left;
                double newLeft = newRect.Width * distanceLeft / maxRect.Width + newRect.Left;
                double distanceRight = maxRect.Right - checkItem.PaintRect.Right;
                double newRight = newRect.Right - newRect.Width / maxRect.Width * distanceRight;
                double distanceTop = checkItem.PaintRect.Top - maxRect.Top;
                double newTop = newRect.Height * distanceTop / maxRect.Height + newRect.Top;
                double distanceBottom = maxRect.Bottom - checkItem.PaintRect.Bottom;
                double newBottom = newRect.Bottom - newRect.Height / maxRect.Height * distanceBottom;

                Rect newClient = new Rect(newLeft, newTop, newRight - newLeft, newBottom - newTop);

                if (newClient != Rect.Empty && newClient.Width > 0 && newClient.Height > 0)
                {
                    drawDC.DrawRectangle(Selector.DrawBrush, Selector.DrawPen, newClient);
                }
            }

            drawDC.Close();
        }

        private bool CanResize(PointControlType controlType, Point moveOffset, Rect maxRect, Rect boundRect)
        {
            if (maxRect == Rect.Empty || maxRect.Width == 0 || maxRect.Height == 0)
            {
                return false;
            }

            double ratioX = maxRect.Width > 0 ? maxRect.Height / maxRect.Width : 1;
            double ratioY = maxRect.Height > 0 ? maxRect.Width / maxRect.Height : 1;
            Point offsetPos = moveOffset;

            switch (controlType)
            {
                case PointControlType.LeftTop:
                case PointControlType.RightBottom:
                    offsetPos = new Point(moveOffset.X, Math.Abs(moveOffset.X) * ratioX * (moveOffset.X < 0 ? -1 : 1));
                    break;
                case PointControlType.LeftBottom:
                case PointControlType.RightTop:
                    offsetPos = new Point(moveOffset.X, Math.Abs(moveOffset.X) * ratioX * (moveOffset.X < 0 ? 1 : -1));
                    break;
                case PointControlType.LeftMiddle:
                    offsetPos = new Point(moveOffset.X, Math.Abs(moveOffset.X) * ratioX * (moveOffset.X < 0 ? 1 : -1));
                    break;
                case PointControlType.RightMiddle:
                    offsetPos = new Point(moveOffset.X, Math.Abs(moveOffset.X) * ratioX * (moveOffset.X < 0 ? -1 : 1));
                    break;
                case PointControlType.MiddlBottom:
                    offsetPos = new Point(Math.Abs(moveOffset.Y) * ratioY * (moveOffset.Y < 0 ? 1 : -1), moveOffset.Y);
                    break;
                case PointControlType.MiddleTop:
                    offsetPos = new Point(Math.Abs(moveOffset.Y) * ratioY * (moveOffset.Y < 0 ? -1 : 1), moveOffset.Y);
                    break;
            }

            double left = maxRect.Left;
            double top = maxRect.Top;
            double right = maxRect.Right;
            double bottom = maxRect.Bottom;

            switch (controlType)
            {
                case PointControlType.LeftTop://左上
                    left += offsetPos.X;
                    top += offsetPos.Y;
                    break;
                case PointControlType.LeftMiddle://左中
                    left += offsetPos.X;
                    top -= offsetPos.Y / 2;
                    bottom += offsetPos.Y / 2;
                    break;
                case PointControlType.LeftBottom://左下
                    left += offsetPos.X;
                    bottom += offsetPos.Y;
                    break;
                case PointControlType.MiddlBottom://中下
                    bottom += offsetPos.Y;
                    left += offsetPos.X / 2;
                    right -= offsetPos.X / 2;
                    break;
                case PointControlType.RightBottom://右下
                    right += offsetPos.X;
                    bottom += offsetPos.Y;
                    break;
                case PointControlType.RightMiddle://右中
                    right += offsetPos.X;
                    top -= offsetPos.Y / 2;
                    bottom += offsetPos.Y / 2;
                    break;
                case PointControlType.RightTop://右上
                    right += offsetPos.X;
                    top += offsetPos.Y;
                    break;
                case PointControlType.MiddleTop://中上
                    top += offsetPos.Y;
                    left += offsetPos.X / 2;
                    right -= offsetPos.X / 2;
                    break;
                default:
                    break;
            }

            Rect newRect = new Rect(new Point(left, top), new Point(right, bottom));

            if (newRect.Left < boundRect.Left || newRect.Top < boundRect.Top || newRect.Bottom > boundRect.Bottom || newRect.Right > boundRect.Right)
            {
                return false;
            }

            return true;
        }

        private void AnnotSelectSave()
        {
            if (!AllowMultiSelect)
            {
                return;
            }

            if (AreaMoveData.HitPageIndex < 0 || PDFViewer == null || Selector == null || Selector.GetSelectCount() < 2)
            {
                return;
            }
            if (!IsMoved)
            {
                return;
            }
            PointControlType hitPointType = Selector.GetHitControlIndex(AreaMoveData.HitAreaPos);

            switch (hitPointType)
            {
                default:
                case PointControlType.None:
                    return;
                case PointControlType.Body:
                    AnnotSelectMoveSave();
                    PDFViewer?.UpdateRenderFrame();
                    return;
                case PointControlType.LeftTop:
                case PointControlType.LeftMiddle:
                case PointControlType.LeftBottom:
                case PointControlType.MiddlBottom:
                case PointControlType.RightBottom:
                case PointControlType.RightMiddle:
                case PointControlType.RightTop:
                case PointControlType.MiddleTop:
                    AnnotSelectResizeSave(hitPointType, OffsetPos, Selector.GetOutBoundRect(), AreaMoveData.HitAreaBound);
                    PDFViewer?.UpdateRenderFrame();
                    return;
            }
        }

        private void AnnotSelectMoveSave()
        {
            GroupHistory historyGroup = new GroupHistory();

            foreach (AnnotData checkItem in Selector.SelectAnnots)
            {
                if (checkItem.Annot == null || checkItem.Annot.IsValid() == false)
                {
                    continue;
                }
                Rect childRect = new Rect(checkItem.PaintRect.X + OffsetPos.X, checkItem.PaintRect.Y + OffsetPos.Y, checkItem.PaintRect.Width, checkItem.PaintRect.Height);
                Rect saveRect = new Rect(
                    childRect.Left - checkItem.PaintOffset.Left + checkItem.CropLeft * checkItem.CurrentZoom,
                    childRect.Top - checkItem.PaintOffset.Top + checkItem.CropTop * checkItem.CurrentZoom,
                    childRect.Width,
                    childRect.Height);

                Rect noZoomRect = new Rect(
                    saveRect.Left / checkItem.CurrentZoom,
                    saveRect.Top / checkItem.CurrentZoom,
                    saveRect.Width / checkItem.CurrentZoom,
                    saveRect.Height / checkItem.CurrentZoom);
                Rect rawRect = DpiHelper.StandardRectToPDFRect(noZoomRect);

                AnnotHistory historyItem = ParamConverter.CreateHistory(checkItem.Annot);
                AnnotParam prevParam = ParamConverter.CPDFDataConverterToAnnotParam(PDFViewer.GetDocument(), checkItem.PageIndex, checkItem.Annot);
                checkItem.Annot.SetRect(new CRect((float)rawRect.Left, (float)rawRect.Bottom, (float)rawRect.Right, (float)rawRect.Top));
                AnnotParam currentParam = ParamConverter.CPDFDataConverterToAnnotParam(PDFViewer.GetDocument(), checkItem.PageIndex, checkItem.Annot);

                historyItem.PreviousParam = prevParam;
                historyItem.CurrentParam = currentParam;
                historyItem.Action = HistoryAction.Update;
                historyItem.PDFDoc = PDFViewer.GetDocument();
                historyGroup.Histories.Add(historyItem);
            }

            if (historyGroup.Histories.Count > 0 && PDFViewer != null)
            {
                PDFViewer.UndoManager?.AddHistory(historyGroup);
                PDFViewer.UpdateAnnotFrame();
            }
        }

        private void AnnotSelectResizeSave(PointControlType controlType, Point offsetPos, Rect maxRect, Rect boundRect)
        {
            double left = maxRect.Left;
            double top = maxRect.Top;
            double right = maxRect.Right;
            double bottom = maxRect.Bottom;

            switch (controlType)
            {
                case PointControlType.LeftTop://左上
                    left += offsetPos.X;
                    top += offsetPos.Y;
                    break;
                case PointControlType.LeftMiddle://左中
                    left += offsetPos.X;
                    top -= offsetPos.Y / 2;
                    bottom += offsetPos.Y / 2;
                    break;
                case PointControlType.LeftBottom://左下
                    left += offsetPos.X;
                    bottom += offsetPos.Y;
                    break;
                case PointControlType.MiddlBottom://中下
                    bottom += offsetPos.Y;
                    left += offsetPos.X / 2;
                    right -= offsetPos.X / 2;
                    break;
                case PointControlType.RightBottom://右下
                    right += offsetPos.X;
                    bottom += offsetPos.Y;
                    break;
                case PointControlType.RightMiddle://右中
                    right += offsetPos.X;
                    top -= offsetPos.Y / 2;
                    bottom += offsetPos.Y / 2;
                    break;
                case PointControlType.RightTop://右上
                    right += offsetPos.X;
                    top += offsetPos.Y;
                    break;
                case PointControlType.MiddleTop://中上
                    top += offsetPos.Y;
                    left += offsetPos.X / 2;
                    right -= offsetPos.X / 2;
                    break;
                default:
                    break;
            }

            Rect newRect = new Rect(new Point(left, top), new Point(right, bottom));

            GroupHistory historyGroup = new GroupHistory();

            foreach (AnnotData checkItem in Selector.SelectAnnots)
            {
                if (checkItem.Annot == null || checkItem.Annot.IsValid() == false)
                {
                    continue;
                }

                double distanceLeft = checkItem.PaintRect.Left - maxRect.Left;
                double newLeft = newRect.Width * distanceLeft / maxRect.Width + newRect.Left;
                double distanceRight = maxRect.Right - checkItem.PaintRect.Right;
                double newRight = newRect.Right - newRect.Width / maxRect.Width * distanceRight;
                double distanceTop = checkItem.PaintRect.Top - maxRect.Top;
                double newTop = newRect.Height * distanceTop / maxRect.Height + newRect.Top;
                double distanceBottom = maxRect.Bottom - checkItem.PaintRect.Bottom;
                double newBottom = newRect.Bottom - newRect.Height / maxRect.Height * distanceBottom;

                Rect newClient = new Rect(newLeft, newTop, newRight - newLeft, newBottom - newTop);

                if (newClient != Rect.Empty && newClient.Width > 0 && newClient.Height > 0)
                {
                    Rect saveRect = new Rect(
                      newClient.Left - checkItem.PaintOffset.Left + checkItem.CropLeft * checkItem.CurrentZoom,
                      newClient.Top - checkItem.PaintOffset.Top + checkItem.CropTop * checkItem.CurrentZoom,
                      newClient.Width,
                      newClient.Height);

                    Rect noZoomRect = new Rect(
                        saveRect.Left / checkItem.CurrentZoom,
                        saveRect.Top / checkItem.CurrentZoom,
                        saveRect.Width / checkItem.CurrentZoom,
                        saveRect.Height / checkItem.CurrentZoom);
                    Rect rawRect = DpiHelper.StandardRectToPDFRect(noZoomRect);

                    AnnotHistory historyItem = ParamConverter.CreateHistory(checkItem.Annot);
                    AnnotParam prevParam = ParamConverter.CPDFDataConverterToAnnotParam(PDFViewer.GetDocument(), checkItem.PageIndex, checkItem.Annot);
                    checkItem.Annot.SetRect(new CRect((float)rawRect.Left, (float)rawRect.Bottom, (float)rawRect.Right, (float)rawRect.Top));
                    AnnotParam currentParam = ParamConverter.CPDFDataConverterToAnnotParam(PDFViewer.GetDocument(), checkItem.PageIndex, checkItem.Annot);

                    historyItem.PreviousParam = prevParam;
                    historyItem.CurrentParam = currentParam;
                    historyItem.Action = HistoryAction.Update;
                    historyItem.PDFDoc = PDFViewer.GetDocument();
                    historyGroup.Histories.Add(historyItem);
                }
            }

            if (historyGroup.Histories.Count > 0 && PDFViewer != null)
            {
                PDFViewer.UndoManager?.AddHistory(historyGroup);
                PDFViewer.UpdateAnnotFrame();
            }
        }

        private void AnnotSelectClean()
        {
            Selector?.CleanDraw();
            Selector?.ClearItem();
        }

        private bool AnnotSelectCommandSupport(RoutedUICommand uiCmd)
        {
            if (!AllowMultiSelect)
            {
                return false;
            }

            if (uiCmd == null || PDFViewer == null || Selector == null)
            {
                return false;
            }

            switch (uiCmd.Name)
            {
                case "Copy":
                case "Cut":
                case "Delete":
                    return Selector.GetSelectCount() >= 2;
                case "Paste":
                    return AnnotParamList.Count() >= 2;
                default:
                    break;
            }
            return false;
        }
        private void AnnotSelectCommandExecute(RoutedUICommand uiCmd)
        {
            if (!AllowMultiSelect)
            {
                return;
            }

            if (uiCmd == null || string.IsNullOrEmpty(uiCmd.Name) || PDFViewer == null || Selector == null)
            {
                return;
            }

            switch (uiCmd.Name)
            {
                case "Copy":
                    AnnotSelectCopy();
                    break;
                case "Cut":
                    AnnotSelectCopy();
                    AnnotSelectDelete();
                    break;
                case "Delete":
                    AnnotSelectDelete();
                    break;
                case "Paste":
                    AnnotSelectPaste();
                    break;
                default:
                    return;
            }
        }
        private void AnnotSelectCopy()
        {
            AnnotParamList?.Clear();
            if (!AllowMultiSelect)
            {
                return;
            }

            if (Selector.GetSelectCount() < 2)
            {
                return;
            }

            foreach (AnnotData checkItem in Selector.SelectAnnots)
            {
                if (checkItem == null || checkItem.Annot == null || checkItem.Annot.IsValid() == false)
                {
                    continue;
                }

                AnnotParam prevParam = ParamConverter.CPDFDataConverterToAnnotParam(PDFViewer.GetDocument(), checkItem.PageIndex, checkItem.Annot);
                if (prevParam == null)
                {
                    continue;
                }
                AnnotParamList.Add(prevParam);
            }
        }

        private void AnnotSelectDelete()
        {
            if (!AllowMultiSelect)
            {
                return;
            }

            if (Selector.GetSelectCount() < 2)
            {
                return;
            }

            GroupHistory historyGroup = new GroupHistory();
            Dictionary<AnnotHistory, CPDFAnnotation> removeDict = new Dictionary<AnnotHistory, CPDFAnnotation>();
            foreach (AnnotData checkItem in Selector.SelectAnnots)
            {
                if (checkItem == null || checkItem.Annot == null || checkItem.Annot.IsValid() == false)
                {
                    continue;
                }
                AnnotHistory historyItem = ParamConverter.CreateHistory(checkItem.Annot);
                AnnotParam prevParam = ParamConverter.CPDFDataConverterToAnnotParam(PDFViewer.GetDocument(), checkItem.PageIndex, checkItem.Annot);
                if (prevParam == null || historyItem == null)
                {
                    continue;
                }

                historyItem.CurrentParam = prevParam;
                historyItem.Action = HistoryAction.Remove;
                historyItem.PDFDoc = PDFViewer.GetDocument();
                removeDict[historyItem] = checkItem.Annot;
            }

            foreach (AnnotHistory annotKey in removeDict.Keys)
            {
                CPDFAnnotation removeAnnot = removeDict[annotKey];
                if (removeAnnot.RemoveAnnot())
                {
                    historyGroup.Histories.Add(annotKey);
                }
            }

            if (historyGroup.Histories.Count > 0)
            {
                CleanSelectedRect();
                AnnotSelectClean();
                PDFViewer?.UndoManager.AddHistory(historyGroup);
                PDFViewer?.UpdateAnnotFrame();
                PDFViewer?.UpdateRenderFrame();
            }
        }

        private void AnnotSelectPaste()
        {
            if (!AllowMultiSelect)
            {
                return;
            }

            double left = 0;
            double right = 0;
            double top = 0;
            double bottom = 0;

            Point point = rightPressPoint;
            rightPressPoint = new Point(-1, -1);

            for (int i = 0; i < AnnotParamList.Count; i++)
            {
                AnnotParam checkParam = AnnotParamList[i];
                if (i == 0)
                {
                    left = checkParam.ClientRect.left;
                    top = checkParam.ClientRect.top;
                    bottom = checkParam.ClientRect.bottom;
                    right = checkParam.ClientRect.right;
                    continue;
                }

                left = Math.Min(left, checkParam.ClientRect.left);
                right = Math.Max(right, checkParam.ClientRect.right);
                top = Math.Min(top, checkParam.ClientRect.top);
                bottom = Math.Max(bottom, checkParam.ClientRect.bottom);
            }

            Point offsetPos = new Point(25, 25);

            PDFViewer.GetPointPageInfo(point, out int pageIndex, out Rect paintRect, out Rect pageBound);
            if (pageIndex >= 0)
            {
                Point zoomPoint = new Point((point.X - pageBound.X) / currentZoom, (point.Y - pageBound.Y) / currentZoom);
                Point rawPoint = DpiHelper.StandardPointToPDFPoint(zoomPoint);
                double rawWidth = DpiHelper.StandardNumToPDFNum(pageBound.Width / currentZoom);
                double rawHeight = DpiHelper.StandardNumToPDFNum(pageBound.Height / currentZoom);

                offsetPos = new Point(rawPoint.X, rawPoint.Y);

                if (rawPoint.X + right - left > rawWidth)
                {
                    offsetPos.X = rawWidth + left - right;
                }
                if (rawPoint.Y + bottom - top > rawHeight)
                {
                    offsetPos.Y = rawHeight + top - bottom;
                }
            }

            GroupHistory historyGroup = new GroupHistory();
            foreach (AnnotParam annotParam in AnnotParamList)
            {
                AnnotParam cloneItem = CloneAnnotParam(annotParam);
                if (cloneItem == null)
                {
                    continue;
                }
                Rect saveRect = new Rect(cloneItem.ClientRect.left, cloneItem.ClientRect.top, cloneItem.ClientRect.width(), cloneItem.ClientRect.height());
                saveRect.X = saveRect.Left - left + offsetPos.X;
                saveRect.Y = saveRect.Top - top + offsetPos.Y;

                cloneItem.PageIndex = pageIndex;
                cloneItem.ClientRect = new CRect((float)saveRect.Left, (float)saveRect.Bottom, (float)saveRect.Right, (float)saveRect.Top);
                AnnotHistory historyItem = ParamConverter.CreateHistory(annotParam);
                historyItem.CurrentParam = cloneItem;
                historyItem.PDFDoc = PDFViewer.GetDocument();

                historyItem.Add();
                historyGroup.Histories.Add(historyItem);
            }

            if (historyGroup.Histories.Count > 0 && PDFViewer != null)
            {
                CleanSelectedRect();
                AnnotSelectClean();
                PDFViewer.UndoManager?.AddHistory(historyGroup);
                PDFViewer.UpdateAnnotFrame();
            }
        }

        private AnnotParam CloneAnnotParam(AnnotParam oldParam)
        {
            if (oldParam != null)
            {
                AnnotParam newParam = new AnnotParam();
                switch (oldParam.CurrentType)
                {
                    case C_ANNOTATION_TYPE.C_ANNOTATION_CIRCLE:
                        newParam = new CircleParam();
                        oldParam.CopyTo(newParam);
                        break;
                    case C_ANNOTATION_TYPE.C_ANNOTATION_FREETEXT:
                        newParam = new FreeTextParam();
                        oldParam.CopyTo(newParam);
                        break;
                    case C_ANNOTATION_TYPE.C_ANNOTATION_HIGHLIGHT:
                        newParam = new HighlightParam();
                        oldParam.CopyTo(newParam);
                        break;
                    case C_ANNOTATION_TYPE.C_ANNOTATION_INK:
                        newParam = new InkParam();
                        oldParam.CopyTo(newParam);
                        break;
                    case C_ANNOTATION_TYPE.C_ANNOTATION_LINE:
                        newParam = new LineParam();
                        oldParam.CopyTo(newParam);
                        break;
                    case C_ANNOTATION_TYPE.C_ANNOTATION_LINK:
                        newParam = new LinkParam();
                        oldParam.CopyTo(newParam);
                        break;
                    case C_ANNOTATION_TYPE.C_ANNOTATION_CARET:
                        newParam = new RedactParam();
                        oldParam.CopyTo(newParam);
                        break;
                    case C_ANNOTATION_TYPE.C_ANNOTATION_SQUARE:
                        newParam = new SquareParam();
                        oldParam.CopyTo(newParam);
                        break;
                    case C_ANNOTATION_TYPE.C_ANNOTATION_SQUIGGLY:
                        newParam = new SquareParam();
                        oldParam.CopyTo(newParam);
                        break;
                    case C_ANNOTATION_TYPE.C_ANNOTATION_STAMP:
                        newParam = new StampParam();
                        oldParam.CopyTo(newParam);
                        break;
                    case C_ANNOTATION_TYPE.C_ANNOTATION_TEXT:
                        newParam = new StickyNoteParam();
                        oldParam.CopyTo(newParam);
                        break;
                    case C_ANNOTATION_TYPE.C_ANNOTATION_STRIKEOUT:
                        newParam = new StickyNoteParam();
                        oldParam.CopyTo(newParam);
                        break;
                    case C_ANNOTATION_TYPE.C_ANNOTATION_UNDERLINE:
                        newParam = new UnderlineParam();
                        oldParam.CopyTo(newParam);
                        break;
                    case C_ANNOTATION_TYPE.C_ANNOTATION_WIDGET:
                        WidgetParm widgetParam = oldParam as WidgetParm;
                        if (widgetParam != null)
                        {
                            switch (widgetParam.WidgetType)
                            {
                                case C_WIDGET_TYPE.WIDGET_CHECKBOX:
                                    newParam = new CheckBoxParam();
                                    oldParam.CopyTo(newParam);
                                    break;
                                case C_WIDGET_TYPE.WIDGET_COMBOBOX:
                                    newParam = new ComboBoxParam();
                                    oldParam.CopyTo(newParam);
                                    break;
                                case C_WIDGET_TYPE.WIDGET_LISTBOX:
                                    newParam = new ListBoxParam();
                                    oldParam.CopyTo(newParam);
                                    break;
                                case C_WIDGET_TYPE.WIDGET_PUSHBUTTON:
                                    newParam = new PushButtonParam();
                                    oldParam.CopyTo(newParam);
                                    break;
                                case C_WIDGET_TYPE.WIDGET_RADIOBUTTON:
                                    newParam = new RadioButtonParam();
                                    oldParam.CopyTo(newParam);
                                    break;
                                case C_WIDGET_TYPE.WIDGET_SIGNATUREFIELDS:
                                    newParam = new SignatureParam();
                                    oldParam.CopyTo(newParam);
                                    break;
                                case C_WIDGET_TYPE.WIDGET_TEXTFIELD:
                                    newParam = new TextBoxParam();
                                    oldParam.CopyTo(newParam);
                                    break;
                                default:
                                    return null;
                            }
                        }
                        break;
                    default:
                        return null;
                }
                return newParam;
            }
            return null;
        }
    }
}