using ComPDFKitViewer.PdfViewer;
using PDF_Office.EventAggregators;
using PDF_Office.Model.EditTools.Background;
using PDF_Office.Model;
using Prism.Commands;
using Prism.Events;
using Prism.Mvvm;
using Prism.Regions;
using System;
using System.Collections.Generic;
using System.Linq;
using PDF_Office.Model.EditTools.Watermark;
using ComPDFKit.PDFDocument;
using ComPDFKit.PDFPage;
using System.Windows.Media.Imaging;
using System.Windows.Media;
using System.Threading.Tasks;
using ComPDFKit.PDFWatermark;
using PDF_Office.Helper;
using PDF_Office.Model.Dialog.HomePageToolsDialogs.HomePagePrinter;
using System.Drawing;
using System.Windows;
using ComPDFKitViewer;
using Size = System.Windows.Size;
using System.Diagnostics;
using System.Windows.Controls;
using ComPDFKit.Import;
using PDF_Office.ViewModels.Tools;
using static System.Windows.Forms.VisualStyles.VisualStyleElement;
using System.Text.RegularExpressions;
using TextBox = System.Windows.Controls.TextBox;

namespace PDF_Office.ViewModels.EditTools.Watermark
{
    public class WatermarkDocumentContentViewModel : BindableBase, INavigationAware
    {

        public IEventAggregator eventAggregator;
        public IRegionManager regionManager;
        public CPDFViewer PDFViewer;
        public CPDFDocument Document;
        private CPDFWatermark watermark;
        private ViewContentViewModel viewContentViewModel;
        private CPDFViewer pdfViewer;
        private WatermarkInfo watermarkInfo;

        public EnumDelete EnumDelete = EnumDelete.StatusCreate;

        public bool firstin = true;

        public string ViewerRegionName { get; set; }

        private int _pageRangeNumber;
        public int PageRangeNumber
        {
            get { return _pageRangeNumber; }
            set { SetProperty(ref _pageRangeNumber, value); }
        }

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

        private int _currentPageIndex;
        public int CurrentPageIndex
        {
            get { return _currentPageIndex; }
            set
            {
                SetProperty(ref _currentPageIndex, value);

            }
        }
        public DelegateCommand<object> ShowInputIndexBoxCommand { set; get; }
        public DelegateCommand<object> GoToPageCommand { set; get; }

        public string Unicode = null;

        public WatermarkDocumentContentViewModel(IEventAggregator eventAggregator, IRegionManager regionManager)
        {
            this.regionManager = regionManager;
            this.eventAggregator = eventAggregator;
            ShowInputIndexBoxCommand = new DelegateCommand<object>(ShowInputIndexBox);
            GoToPageCommand = new DelegateCommand<object>(GoToPage);
            Unicode = App.mainWindowViewModel.SelectedItem.Unicode;
            eventAggregator.GetEvent<SetWatermarkEvent>().Subscribe(SetWatermark, e => e.Unicode == Unicode);
            ViewerRegionName = RegionNames.WatermarkViwerRegionName;
            eventAggregator.GetEvent<ConfirmEditToolsWatermarkEvent>().Subscribe(ConfirmEditToolsWatermark);
            eventAggregator.GetEvent<DeleteWatermarkEvent>().Subscribe(DeleteWatermark, e => e.Unicode == Unicode);
        }

        public void ShowInputIndexBox(object obj)
        {
            if (obj != null)
            {
                InputIndexBoxVisible = Visibility.Visible;
            }
        }

        public void GoToPage(object obj)
        {

            if (obj != null)
            {
                var args = obj as TextBox;
                if (args.Text == null || !Regex.Match(args.Text, "^\\d+$").Success)
                {
                    return;
                }
                if (int.Parse(args.Text) > 0 && int.Parse(args.Text) <= PDFViewer.Document.PageCount)
                {
                    PDFViewer.GoToPage(int.Parse(args.Text) - 1);
                    InputIndexBoxVisible = Visibility.Collapsed;
                }
            }
        }

        public void ConfirmEditToolsWatermark()
        {
            if (EnumDelete == EnumDelete.StatusDeleteAll)
            {
                viewContentViewModel.PDFViewer.Document.DeleteWatermarks();
            }
            else
            {
                if (watermarkInfo != null)
                {

                    if (EnumDelete == EnumDelete.StatusDeleteInitial)
                    {
                        viewContentViewModel.PDFViewer.Document.DeleteWatermarks();
                        CreateWatermark(viewContentViewModel.PDFViewer.Document);
                    }
                    else
                    {
                        CreateWatermark(viewContentViewModel.PDFViewer.Document);
                    }
                }
            }

            viewContentViewModel.PDFViewer.UndoManager.CanSave = true;
        }

        public void DeleteWatermark(EnumDeleteUnicode enumDeleteunicode)
        {
            if (enumDeleteunicode.Status == EnumDelete.StatusDeleteAll || enumDeleteunicode.Status == EnumDelete.StatusDeleteInitial)
            {
                EnumDelete enumDelete = enumDeleteunicode.Status;
                EnumDelete = enumDelete;
                PDFViewer.Document.DeleteWatermarks();
                PDFViewer.Document.ReleasePages();
                PDFViewer.ReloadDocument();
            }
        }

        public void SetWatermark(WatermarkInfoUnicode watermarkInfounicode)
        {
            WatermarkInfo watermarkInfo = watermarkInfounicode.Status;
            this.watermarkInfo = watermarkInfo;
            EnumDelete = EnumDelete.StatusCreate;
            PDFViewer.InvalidChildVisual(false);
        }

        public void CreateWatermark(CPDFDocument document, bool IsNewDoc = false)
        {
            if (watermarkInfo != null)
            {
                if (IsNewDoc) { document.DeleteWatermarks(); }

                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.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);
                if (IsNewDoc) { watermark.SetPages("0"); }
                else { watermark.SetPages(watermarkInfo.PageRange); }
                Trace.WriteLine("IsCreateWatermark: " + watermark.CreateWatermark());
                Trace.WriteLine("IsUpdateWatermark: " + watermark.UpdateWatermark());
            }
        }


        private void UndoManager_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
        }

        private void CurrentViewer_CustomDrawHandler(object sender, CustomDrawData e)
        {
            if (e.DrawPages.Count > 0 && e.DrawContext != null)
            {
                List<int> PageIndexLists = new List<int>();
                foreach (DrawPageData drawPageData in e.DrawPages)
                {
                    if (watermarkInfo != null)
                    {
                        char[] enumerationSeparator = new char[] { ',' };
                        char[] rangeSeparator = new char[] { '-' };
                        if (CommonHelper.GetPagesInRange(ref PageIndexLists, watermarkInfo.PageRange, Document.PageCount, enumerationSeparator, rangeSeparator, true))
                        { //TODO
                            Trace.WriteLine(CommonHelper.GetPagesInRange(ref PageIndexLists, watermarkInfo.PageRange, Document.PageCount, enumerationSeparator, rangeSeparator, true));
                            Trace.WriteLine(drawPageData.PageIndex);
                            foreach (var abbb in PageIndexLists)
                            {

                                Trace.WriteLine("smgui _______" + abbb);
                            }
                            if (PageIndexLists.Contains(drawPageData.PageIndex - 1))
                            {
                                if (watermarkInfo.WatermarkType == C_Watermark_Type.WATERMARK_TYPE_TEXT && watermarkInfo.Text != "")
                                {
                                    WriteableBitmap waterMarkBitmap = GetWatermark(PDFViewer.Document, e.Zoom, drawPageData.PageIndex);
                                    e.DrawContext.DrawImage(waterMarkBitmap, drawPageData.PageBound);
                                }
                                if (watermarkInfo.WatermarkType == C_Watermark_Type.WATERMARK_TYPE_IMG)
                                {
                                    WriteableBitmap waterMarkBitmap = GetWatermark(PDFViewer.Document, e.Zoom, drawPageData.PageIndex);
                                    e.DrawContext.DrawImage(waterMarkBitmap, drawPageData.PageBound);
                                }
                            }
                        }
                    }
                }
            }
            CurrentPageIndex = PDFViewer.CurrentIndex + 1;
        }
        private WriteableBitmap GetWatermark(CPDFDocument oldDoc, double zoom, int pageIndex)
        {
            Size pageSize = oldDoc.GetPageSize(pageIndex);

            CPDFDocument newDoc = CPDFDocument.CreateDocument();
            newDoc.InsertPage(0, pageSize.Width, pageSize.Height, null);
            CreateWatermark(newDoc, true);
            CPDFPage newPage = newDoc.PageAtIndex(0);
            double scale = 96.0 / 72.0;
            zoom = zoom * 1.5;
            Rect renderRect = new Rect(0, 0, (int)(pageSize.Width * scale), (int)(pageSize.Height * scale));
            byte[] imageArray = new byte[(int)(renderRect.Width * renderRect.Height * 4)];
            newPage.RenderPageBitmapWithMatrix(1 / (float)zoom, renderRect, 0x00FFFFFF, imageArray, 1, true);
            WriteableBitmap WirteBitmap = new WriteableBitmap((int)renderRect.Width, (int)renderRect.Height, 96, 96, PixelFormats.Bgra32, null);
            WirteBitmap.WritePixels(new Int32Rect(0, 0, (int)renderRect.Width, (int)renderRect.Height), imageArray, WirteBitmap.BackBufferStride, 0);
            return WirteBitmap;
        }

        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<ViewContentViewModel>(ParameterNames.ViewContentViewModel, out viewContentViewModel);
            if (pdfViewer != null && viewContentViewModel != null)
            {
                if (!regionManager.Regions[ViewerRegionName].Views.Contains(PDFViewer))
                {
                    PDFViewer = new CPDFViewer();
                    PDFViewer.InitDocument(pdfViewer.Document.FilePath);
                    Document = PDFViewer.Document;
                    PDFViewer.CustomDrawHandler += CurrentViewer_CustomDrawHandler;
                    PDFViewer.UndoManager.PropertyChanged += UndoManager_PropertyChanged;
                    regionManager.AddToRegion(ViewerRegionName, PDFViewer);
                    PDFViewer.SetAnnotInteraction(!PDFViewer.GetAnnotInteraction());
                    PDFViewer.Load();
                    PDFViewer.ChangeViewMode(ViewMode.Single);
                    PDFViewer.SetMouseMode(MouseModes.Default);
                    eventAggregator.GetEvent<CurrentWatermarkPDFViewerEvent>().Publish(new CPDFViewerUnicode
                    {
                        Unicode = Unicode,
                        Status = PDFViewer
                    });
                    PageRangeNumber = PDFViewer.Document.PageCount;
                    PDFViewer.Zoom(0.5);
                }
            }
        }
    }
}