using ComPDFKit.PDFDocument;
using ComPDFKit.PDFPage;
using ComPDFKit.PDFWatermark;
using ComPDFKitViewer.PdfViewer;
using PDF_Master.CustomControl;
using PDF_Master.EventAggregators;
using PDF_Master.Helper;
using PDF_Master.Model.EditTools.Watermark;
using PDF_Master.Model;
using PDF_Master.Properties;
using PDFSettings;
using Prism.Commands;
using Prism.Events;
using Prism.Mvvm;
using Prism.Regions;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Windows;
using System.Threading.Tasks;
using PDF_Master.Model.EditTools.Background;
using PDF_Master.Model.EditTools.HeaderFooter;
using Prism.Services.Dialogs;

namespace PDF_Master.ViewModels.Dialog.HomePageToolsDialogs.HomePageBatchProcessing.HomePageWatermark
{
    public class HomePageWatermarkCreateFileContentViewModel : BindableBase, INavigationAware
    {
        public WatermarkInfo WatermarkInfo = new WatermarkInfo();

        private WatermarkItem TemplateWatermarkItem;

        private CPDFViewer PDFViewer;

        IEventAggregator eventAggregator;
        public IDialogService dialogs;

        private List<string> _opacityList = new List<string>();
        public List<string> OpacityList
        {
            get { return _opacityList; }
            set
            {
                SetProperty(ref _opacityList, value);
            }
        }

        private void InitOpacityList()
        {
            OpacityList.Clear();
            for (int temp = 0; temp <= 100; temp += 10)
            {
                OpacityList.Add(temp.ToString() + " %");
            }
        }

        private List<string> _rotationList = new List<string>();
        public List<string> RotationList
        {
            get { return _rotationList; }
            set
            {
                SetProperty(ref _rotationList, value);
            }
        }

        private void InitRotationList()
        {
            RotationList.Clear();
            for (int temp = -45; temp <= 45; temp += 15)
            {
                RotationList.Add(temp.ToString());
            }
        }

        private List<string> _scaleList = new List<string>();
        public List<string> ScaleList
        {
            get { return _scaleList; }
            set
            {
                SetProperty(ref _scaleList, value);
            }
        }

        private void InitScaleList()
        {
            ScaleList.Clear();
            for (int temp = 0; temp <= 100; temp += 10)
            {
                ScaleList.Add(temp.ToString() + " %");
            }
        }

        private List<string> _isFrontList = new List<string>();
        public List<string> IsFrontList
        {
            get { return _isFrontList; }
            set
            {
                SetProperty(ref _isFrontList, value);
            }
        }

        private void InitIsFrontList()
        {
            IsFrontList.Clear();
            IsFrontList.Add("位于页面上方");
            IsFrontList.Add("位于页面下方");
        }

        private int _rotationValue = 0;
        public int RotationValue
        {
            get { return _rotationValue; }
            set
            {
                SetProperty(ref _rotationValue, value);
                WatermarkInfo.Rotation = RotationValue;
               
            }
        }

        private int _opacityValue = 100;
        public int OpacityValue
        {
            get { return _opacityValue; }
            set
            {
                SetProperty(ref _opacityValue, value);
                WatermarkInfo.Opacity = (byte)OpacityValue;
                
            }
        }


        private string _rotationText = "0";
        public string RotationText
        {
            get { return _rotationText; }
            set
            {
                SetProperty(ref _rotationText, value);
            }
        }

        private string _opacityText = "100 %";
        public string OpacityText
        {
            get { return _opacityText; }
            set
            {
                SetProperty(ref _opacityText, value);

            }
        }

        private string _relativeScaleText = "50 %";
        public string RelativeScaleText
        {
            get { return _relativeScaleText; }
            set
            {
                SetProperty(ref _relativeScaleText, value);
            }
        }


        private int _relativeScaleValue = 50;
        public int RelativeScaleValue
        {
            get { return _relativeScaleValue; }
            set
            {
                SetProperty(ref _relativeScaleValue, value);
                WatermarkInfo.ImageSize = RelativeScaleValue;
                
            }
        }

        private string _vertOffsetValue = "0";
        public string VertOffsetValue
        {
            get { return _vertOffsetValue; }
            set
            {
                SetProperty(ref _vertOffsetValue, value);
                WatermarkInfo.VertOffset = float.Parse(VertOffsetValue);
                
            }
        }

        private string _horizOffsetValue = "0";
        public string HorizOffsetValue
        {
            get { return _horizOffsetValue; }
            set
            {
                SetProperty(ref _horizOffsetValue, value);
                WatermarkInfo.HorizOffset = float.Parse(HorizOffsetValue);
                
            }
        }

        private string _verticalSpacingValue = "6";
        public string VerticalSpacingValue
        {
            get { return _verticalSpacingValue; }
            set
            {
                SetProperty(ref _verticalSpacingValue, value);
                WatermarkInfo.VerticalSpacing = float.Parse(VerticalSpacingValue);
                
            }
        }

        private string _horizontalSpacingValue = "6";
        public string HorizontalSpacingValue
        {
            get { return _horizontalSpacingValue; }
            set
            {
                SetProperty(ref _horizontalSpacingValue, value);
                WatermarkInfo.HorizontalSpacing = float.Parse(HorizontalSpacingValue);
                
            }
        }

        public string _pageRangeText = "0";
        public string PageRangeText
        {
            get { return _pageRangeText; }
            set
            {
                _pageRangeText = value;
                WatermarkInfo.PageRange = PageRangeText;
                //EditToolsHelper.GetPageRange(PageRangeSelectIndex, PDFViewer.Document, ref WatermarkInfo.PageRange, PageRangeText);

            }
        }

        private bool _isFullValue = false;
        public bool IsFullValue
        {
            get { return _isFullValue; }
            set
            {
                SetProperty(ref _isFullValue, value);
                WatermarkInfo.Isfull = IsFullValue;
                
            }
        }

        private bool _isRelativeScaleValue = false;
        public bool IsRelativeScaleValue
        {
            get { return _isRelativeScaleValue; }
            set
            {
                SetProperty(ref _isRelativeScaleValue, value);
                WatermarkInfo.IsRelativeScale = IsRelativeScaleValue;
               
            }
        }

        private int _pageRangeSelectIndex = 0;
        public int PageRangeSelectIndex
        {
            get { return _pageRangeSelectIndex; }
            set
            {
                SetProperty(ref _pageRangeSelectIndex, value);
                WatermarkInfo.PageRangeIndex = PageRangeSelectIndex;
                //EditToolsHelper.GetPageRange(PageRangeSelectIndex, PDFViewer.Document, ref WatermarkInfo.PageRange, PageRangeText);
                

            }
        }

        private int _isFrontSelectedIndex = 0;
        public int IsFrontSelectedIndex
        {
            get { return _isFrontSelectedIndex; }
            set
            {
                SetProperty(ref _isFrontSelectedIndex, value);
                SetIsFront(IsFrontSelectedIndex);
                
            }
        }

        private string _fileNameText = "";
        public string FileNameText
        {
            get { return _fileNameText; }
            set
            {
                SetProperty(ref _fileNameText, value);
            }
        }

        private Visibility _createFileVisible = Visibility.Collapsed;
        public Visibility CreateFileVisible
        {
            get { return _createFileVisible; }
            set { SetProperty(ref _createFileVisible, value); }
        }

        private ObservableDictionary<string, bool> _getLocationFromNumber = new ObservableDictionary<string, bool>();
        public ObservableDictionary<string, bool> GetLocationFromNumber
        {
            get { return _getLocationFromNumber; }
            set { _getLocationFromNumber = value; }
        }


        public DelegateCommand<object> ChangeLocationCommand { get; set; }

        public DelegateCommand OpenFileCommand { get; set; }

        public string Unicode = null;

        public HomePageWatermarkCreateFileContentViewModel(IEventAggregator eventAggregator, IDialogService dialogs)
        {
            this.eventAggregator = eventAggregator;
            WatermarkInfo.WatermarkType = C_Watermark_Type.WATERMARK_TYPE_IMG;
            ChangeLocationCommand = new DelegateCommand<object>(ChangeLocation);
            OpenFileCommand = new DelegateCommand(OpenFile);
            InitList();
            InitWatermarkInfo();
            InitLocationButtonMatrix();
            eventAggregator.GetEvent<SaveWatermarkTemplateEvent>().Subscribe(SaveWatermarkTemplate, e => e.Unicode == Unicode);
            eventAggregator.GetEvent<ConfirmEditWatermarkTemplateItemEvent>().Subscribe(ConfirmEditWatermarkTemplateItem, e => e.Unicode == Unicode);
            this.dialogs = dialogs;
        }

        public void SaveWatermarkTemplate(EnumTextOrFileUnicode enumTextOrFileunicode)
        {
            EnumTextOrFile enumTextOrFile = enumTextOrFileunicode.Status;
            if (enumTextOrFile == EnumTextOrFile.StatusFile && FileNameText != "")
            {
                SaveCurrentTemplate();
            }
        }

        public void ConvertInfoToItem(ref WatermarkItem watermarkItem, WatermarkInfo watermarkInfo)
        {
            if (watermarkInfo != null)
            {
                watermarkItem.type = watermarkInfo.WatermarkType;
                //watermarkItem.imageArray = watermarkInfo.ImageArray;
                watermarkItem.imagepath = watermarkInfo.ImagePath;
                watermarkItem.imageSize = watermarkInfo.ImageSize;
                watermarkItem.imageWidth = watermarkInfo.ImageWidth;
                watermarkItem.imageHeight = watermarkInfo.ImageHeight;
                watermarkItem.horizalign = watermarkInfo.WatermarkHorizalign;
                watermarkItem.vertalign = watermarkInfo.WatermarkVertalign;
                watermarkItem.isRelativeScale = watermarkInfo.IsRelativeScale;
                watermarkItem.isFullScreen = watermarkInfo.Isfull;
                watermarkItem.isfront = watermarkInfo.IsFront;
                watermarkItem.opacity = watermarkInfo.Opacity;
                watermarkItem.rotation = watermarkInfo.Rotation;
                watermarkItem.vertOffset = watermarkInfo.VertOffset;
                watermarkItem.horizOffset = watermarkInfo.HorizOffset;
                watermarkItem.verticalSpacing = watermarkInfo.VerticalSpacing;
                watermarkItem.horizontalSpacing = watermarkInfo.HorizontalSpacing;
                
                watermarkItem.pageRange = watermarkInfo.PageRange;

                List<int> PageIndexLists = new List<int>();
                if (PageRangeSelectIndex == 3 && !CommonHelper.GetPagesInRange(ref PageIndexLists, watermarkInfo.PageRange, 9999, new char[] { ',' }, new char[] { '-' }))
                {
                    watermarkInfo.PageRangeIndex = 0;
                }
                watermarkItem.pageRangeIndex = watermarkInfo.PageRangeIndex;
            }
        }

        public void ConvertItemToInfo(WatermarkItem watermarkItem, ref WatermarkInfo watermarkInfo)
        {
            if (watermarkItem != null)
            {
                watermarkInfo.WatermarkType = C_Watermark_Type.WATERMARK_TYPE_IMG;
                if (watermarkItem.imagepath != "")
                {
                    FileInfo file = new FileInfo(watermarkItem.imagepath);
                    if (file.Exists)
                    {
                        if (file.Extension == ".pdf")
                        {
                            GetBitmapFromDocment(null,watermarkItem.imagepath);
                        }
                        else
                        {
                            EditToolsHelper.ChooseFile(watermarkItem.imagepath, ref WatermarkInfo);
                        }
                    }
                    else
                    {
                        watermarkInfo.WatermarkType = ComPDFKit.PDFWatermark.C_Watermark_Type.WATERMARK_TYPE_UNKWON;
                        MessageBoxEx.Show("原路径为：" + watermarkItem.imagepath + ",该文件不存在");
                    }
                }
                watermarkInfo.WatermarkHorizalign = watermarkItem.horizalign;
                watermarkInfo.WatermarkVertalign = watermarkItem.vertalign;
                watermarkInfo.IsRelativeScale = watermarkItem.isRelativeScale;
                watermarkInfo.Isfull = watermarkItem.isFullScreen;
                watermarkInfo.IsFront = watermarkItem.isfront;
                watermarkInfo.ImageSize = watermarkItem.imageSize;
                watermarkInfo.Opacity = watermarkItem.opacity;
                watermarkInfo.Rotation = watermarkItem.rotation;
                watermarkInfo.VertOffset = watermarkItem.vertOffset;
                watermarkInfo.HorizOffset = watermarkItem.horizOffset;
                watermarkInfo.VerticalSpacing = watermarkItem.verticalSpacing;
                watermarkInfo.HorizontalSpacing = watermarkItem.horizontalSpacing;
                watermarkInfo.PageRange=watermarkItem.pageRange;
                watermarkInfo.PageRangeIndex = watermarkItem.pageRangeIndex;
                //EditToolsHelper.GetPageRange(watermarkItem.pageRangeIndex, PDFViewer.Document, ref WatermarkInfo.PageRange, watermarkItem.pageRange);
            }
        }

        public void SaveCurrentTemplate()
        {
            var watermarkItem = new WatermarkItem();
            ConvertInfoToItem(ref watermarkItem, WatermarkInfo);
            watermarkItem.templateName += Settings.Default.WatermarkIndex.ToString();
            try
            {
                //创建缓存文件夹
                string folderPath = Path.Combine(App.CurrentPath, "Watermark");
                //有可能因为其他原因存在同名文件，导致创建文件夹失败，需要先删除同名文件
                //保险措施(猜测)
                if (File.Exists(folderPath))
                {
                    File.Delete(folderPath);
                }

                DirectoryInfo tempfolder = new DirectoryInfo(folderPath);
                if (!tempfolder.Exists)
                {
                    tempfolder.Create();
                }

                //预览图缓存
                string saveName = Guid.NewGuid().ToString();
                string savePath = Path.Combine(folderPath, saveName);
                System.Windows.Size pageSize = new Size { Width = 128, Height = 160 };
                CPDFDocument tempDocument = CPDFDocument.CreateDocument();
                if (tempDocument != null)
                {
                    tempDocument.InsertPage(0, pageSize.Width, pageSize.Height, null);
                    CreateWatermark(tempDocument, WatermarkInfo);
                    //获取透明背景的图片
                    var bitmap = ToolMethod.RenderPageBitmapNoWait(tempDocument, (int)pageSize.Width, (int)pageSize.Height, 0, false, false, 0x00FFFFFF);
                    using (FileStream stream = new FileStream(savePath, FileMode.Create))
                    {
                        bitmap.Save(stream, System.Drawing.Imaging.ImageFormat.Png);
                    }

                    watermarkItem.previewImagePath = savePath;
                    tempDocument.Release();

                    Settings.Default.WatermarkTemplateList.Add(watermarkItem);
                    Settings.Default.Save();
                }
            }
            catch
            {

            }

            this.eventAggregator.GetEvent<EnterTemplateListOrCreateEvent>().Publish(new EnumTemplateListOrCreateUnicode
            {
                Unicode = Unicode,
                Status = EnumTemplateListOrCreate.StatusTemplate
            });
        }

        private void SetIsFront(int Index)
        {
            if (Index == 0)
            {
                WatermarkInfo.IsFront = true;
            }
            if (Index == 1)
            {
                WatermarkInfo.IsFront = false;
            }
        }

        private void InitList()
        {
            InitOpacityList();
            InitIsFrontList();
            InitRotationList();
            InitScaleList();
        }

        private void InitWatermarkInfo()
        {

            WatermarkInfo.Rotation = RotationValue;
            WatermarkInfo.ImageSize = RelativeScaleValue;
            WatermarkInfo.Opacity = (byte)OpacityValue;
            WatermarkInfo.VertOffset = float.Parse(VertOffsetValue);
            WatermarkInfo.HorizOffset = float.Parse(HorizOffsetValue);
            WatermarkInfo.VerticalSpacing = float.Parse(VerticalSpacingValue);
            WatermarkInfo.HorizontalSpacing = float.Parse(HorizontalSpacingValue);
            WatermarkInfo.WatermarkHorizalign = C_Watermark_Horizalign.WATERMARK_HORIZALIGN_CENTER;
            WatermarkInfo.WatermarkVertalign = C_Watermark_Vertalign.WATERMARK_VERTALIGN_CENTER;
            WatermarkInfo.IsRelativeScale = IsRelativeScaleValue;
            WatermarkInfo.Isfull = IsFullValue;
            SetIsFront(IsFrontSelectedIndex);
        }

        private void InitLocationButtonMatrix()
        {
            GetLocationFromNumber.Clear();
            for (var temp = 0; temp <= 22; temp++)
            {
                GetLocationFromNumber.Add(temp.ToString(), true);
                if (temp % 10 == 2)
                {
                    temp += 7;
                }
            }
            int Num = (int)WatermarkInfo.WatermarkVertalign * 10 + (int)WatermarkInfo.WatermarkHorizalign;
            GetLocationFromNumber[Num.ToString()] = false;

        }

        public void ChangeLocation(object e)
        {
            string args = e as string;
            if (args != null)
            {
                WatermarkInfo.WatermarkVertalign = (C_Watermark_Vertalign)(int.Parse(args) / 10);
                WatermarkInfo.WatermarkHorizalign = (C_Watermark_Horizalign)(int.Parse(args) % 10);
                
                InitLocationButtonMatrix();
            }
        }

        public void ConfirmEditToolsWatermark()
        {

           

        }

        public void CreateWatermark(CPDFDocument document, WatermarkInfo watermarkInfo)
        {
            if (watermarkInfo != null)
            {
                document.DeleteWatermarks();
                CPDFWatermark watermark;
                if (watermarkInfo.WatermarkType == C_Watermark_Type.WATERMARK_TYPE_TEXT)
                {
                    watermark = document.InitWatermark(C_Watermark_Type.WATERMARK_TYPE_TEXT);
                    watermark.SetText(watermarkInfo.Text);
                    watermark.SetFontName(watermarkInfo.FontName);
                    watermark.SetFontSize(watermarkInfo.TextSize);
                    //watermark.SetScale(watermarkInfo.TextSize);
                    watermark.SetTextRGBColor(watermarkInfo.TextColor);
                }
                else
                {
                    watermark = document.InitWatermark(C_Watermark_Type.WATERMARK_TYPE_IMG);
                    if (watermarkInfo.ImageArray != null)
                    {
                        watermark.SetImage(watermarkInfo.ImageArray, watermarkInfo.ImageWidth, watermarkInfo.ImageHeight);
                    }
                    watermark.SetScale(watermarkInfo.ImageSize / 100);
                }
                watermark.SetRotation((float)((watermarkInfo.Rotation / 180) * Math.PI));
                watermark.SetOpacity((byte)(((float)watermarkInfo.Opacity / 100) * 255));
                watermark.SetFront(watermarkInfo.IsFront);
                watermark.SetVertalign(watermarkInfo.WatermarkVertalign);
                watermark.SetHorizalign(watermarkInfo.WatermarkHorizalign);
                watermark.SetFullScreen(watermarkInfo.Isfull);
                watermark.SetVertOffset(watermarkInfo.VertOffset);
                watermark.SetHorizOffset(watermarkInfo.HorizOffset);
                watermark.SetHorizontalSpacing(watermarkInfo.HorizontalSpacing);
                watermark.SetVerticalSpacing(watermarkInfo.VerticalSpacing);
                watermark.SetPages("0");
                Trace.WriteLine("IsCreateWatermark: " + watermark.CreateWatermark());
                Trace.WriteLine("IsUpdateWatermark: " + watermark.UpdateWatermark());
            }
        }

        public void ConfirmEditWatermarkTemplateItem(EnumTextOrFileUnicode enumTextOrFileunicode)
        {
            EnumTextOrFile enumTextOrFile = enumTextOrFileunicode.Status;
            if (enumTextOrFile == EnumTextOrFile.StatusFile && FileNameText != "")
            {
                var watermarkItem = new WatermarkItem();
                ConvertInfoToItem(ref watermarkItem, WatermarkInfo);
                try
                {
                    //创建缓存文件夹
                    string folderPath = Path.Combine(App.CurrentPath, "Watermark");
                    //有可能因为其他原因存在同名文件，导致创建文件夹失败，需要先删除同名文件
                    //保险措施(猜测)
                    if (File.Exists(folderPath))
                    {
                        File.Delete(folderPath);
                    }

                    DirectoryInfo tempfolder = new DirectoryInfo(folderPath);
                    if (!tempfolder.Exists)
                    {
                        tempfolder.Create();
                    }

                    //预览图缓存
                    string saveName = Guid.NewGuid().ToString();
                    string savePath = Path.Combine(folderPath, saveName);
                    System.Windows.Size pageSize = new Size { Width = 128, Height = 160 };
                    CPDFDocument tempDocument = CPDFDocument.CreateDocument();
                    if (tempDocument != null)
                    {
                        tempDocument.InsertPage(0, pageSize.Width / 4, pageSize.Height, null);
                        CreateWatermark(tempDocument, WatermarkInfo);
                        //获取透明背景的图片
                        var bitmap = ToolMethod.RenderPageBitmapNoWait(tempDocument, (int)pageSize.Width, (int)pageSize.Height, 0, false, false, 0x00FFFFFF);
                        using (FileStream stream = new FileStream(savePath, FileMode.Create))
                        {
                            bitmap.Save(stream, System.Drawing.Imaging.ImageFormat.Png);
                        }

                        watermarkItem.previewImagePath = savePath;
                        tempDocument.Release();

                        Settings.Default.WatermarkTemplateList[TemplateWatermarkItem.listIndex] = watermarkItem;
                        Settings.Default.Save();
                    }
                }
                catch
                {

                }


                this.eventAggregator.GetEvent<EnterTemplateListOrCreateEvent>().Publish(new EnumTemplateListOrCreateUnicode
                {
                    Unicode = Unicode,
                    Status = EnumTemplateListOrCreate.StatusTemplate
                });
            }
        }

        /// <summary>
        /// 根据已知Info初始化
        /// </summary>
        public void InitComponentBySelectedInfo()
        {
            ConvertItemToInfo(TemplateWatermarkItem, ref WatermarkInfo);
            VertOffsetValue = WatermarkInfo.VertOffset.ToString();
            HorizOffsetValue = WatermarkInfo.HorizOffset.ToString();
            VerticalSpacingValue = WatermarkInfo.VerticalSpacing.ToString();
            HorizontalSpacingValue = WatermarkInfo.HorizontalSpacing.ToString();
            PageRangeSelectIndex = WatermarkInfo.PageRangeIndex;
            IsFrontSelectedIndex = Convert.ToInt32(!WatermarkInfo.IsFront);
            RotationText = WatermarkInfo.Rotation.ToString();
            OpacityText = WatermarkInfo.Opacity.ToString() + " %";
            RelativeScaleText = WatermarkInfo.TextSize.ToString() + " %";
            InitLocationButtonMatrix();
            CreateFileVisible = Visibility.Visible;
            IsRelativeScaleValue = WatermarkInfo.IsRelativeScale;
            IsFullValue = WatermarkInfo.Isfull;
            RelativeScaleText = WatermarkInfo.ImageSize.ToString() + " %";
        }

        public void OpenFile()
        {
            System.Windows.Forms.OpenFileDialog dlg = new System.Windows.Forms.OpenFileDialog();
            dlg.Multiselect = false;
            dlg.Filter = "PDF|*.png;*.jpg;*.pdf";
            if (dlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                FileNameText = dlg.SafeFileName;
                FileInfo file = new FileInfo(dlg.FileName);
                if (file.Extension == ".pdf")
                {
                    CPDFDocument document = CPDFDocument.InitWithFilePath(dlg.FileName);
                    if (document.IsLocked)
                    {
                        //DialogParameters value = new DialogParameters();
                        //value.Add(ParameterNames.PDFDocument, document);
                        //dialogs.ShowDialog(DialogNames.VerifyPassWordDialog, value, e =>
                        //{
                        //    if (e.Result == ButtonResult.OK)
                        //    {
                        //        if (e.Parameters.ContainsKey(ParameterNames.PassWord) && e.Parameters.GetValue<string>(ParameterNames.PassWord) != null)
                        //        {
                        //            document.UnlockWithPassword(e.Parameters.GetValue<string>(ParameterNames.PassWord).ToString());
                        //        }
                        //    }
                        //});
                        //if (document.IsLocked)
                        //{
                        //    return;
                        //}
                        return;
                    }
                    GetBitmapFromDocment(document);
                }
                else
                {
                    EditToolsHelper.ChooseFile(dlg.FileName, ref WatermarkInfo);
                }
                WatermarkInfo.ImagePath = dlg.FileName;
                CreateFileVisible = Visibility.Visible;
            }
        }


        public async void GetBitmapFromDocment(CPDFDocument document = null, string filePath = "")
        {
            if (document == null)
            {
                document = CPDFDocument.InitWithFilePath(filePath);
            }
            CPDFPage page = document.PageAtIndex(0);
            byte[] bmp_data = new byte[(int)page.PageSize.Width * (int)page.PageSize.Height * 4];
            await Task.Run(delegate
            {
                page.RenderPageBitmap(0, 0, (int)page.PageSize.Width, (int)page.PageSize.Height, 0xffffffff, bmp_data, 1);
            });
            WatermarkInfo.ImageArray = bmp_data;
            WatermarkInfo.ImageWidth = (int)page.PageSize.Width;
            WatermarkInfo.ImageHeight = (int)page.PageSize.Height;
            document.ReleasePages();
            document.Release();
        }

        public bool IsNavigationTarget(NavigationContext navigationContext)
        {
            return true;
        }

        public void OnNavigatedFrom(NavigationContext navigationContext)
        {
        }

        public void OnNavigatedTo(NavigationContext navigationContext)
        {
            navigationContext.Parameters.TryGetValue<CPDFViewer>(ParameterNames.PDFViewer, out PDFViewer);
            navigationContext.Parameters.TryGetValue<string>("Unicode", out Unicode);
            //EditToolsHelper.GetPageRange(PageRangeSelectIndex, PDFViewer.Document, ref WatermarkInfo.PageRange, PageRangeText);
            if (navigationContext.Parameters.TryGetValue<WatermarkItem>("WatermarkItem", out TemplateWatermarkItem))
            {
                InitComponentBySelectedInfo();
            }
        }
    }
}