using ComPDFKitViewer;
using ComPDFKitViewer.PdfViewer;
using Microsoft.Office.Interop.Excel;
using PDF_Office.Helper;
using PDF_Office.Model;
using PDFSettings.Settings;
using Prism.Commands;
using Prism.Mvvm;
using Prism.Regions;
using Prism.Services.Dialogs;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.IO;
using System.Threading.Tasks;
using ContextMenu = System.Windows.Controls.ContextMenu;
using MenuItem = System.Windows.Controls.MenuItem;
using OpenFileDialog = Microsoft.Win32.OpenFileDialog;
using Visibility = System.Windows.Visibility;

namespace PDF_Office.ViewModels.PropertyPanel.ViewModular
{
    internal class SplitScreenContentViewModel : BindableBase, INavigationAware
    {
        private ObservableCollection<string> selectedFiles;

        public ObservableCollection<string> SelectedFiles
        {
            get { return selectedFiles; }
            set
            {
                SetProperty(ref selectedFiles, value);
            }
        }

        private string splitViewRegionName;

        public string SplitViewRegionName
        {
            get { return splitViewRegionName; }
            set
            {
                SetProperty(ref splitViewRegionName, value);
            }
        }

        private string splitScreenPageRegionName;

        public string SplitScreenPageRegionName
        {
            get { return splitScreenPageRegionName; }
            set
            {
                SetProperty(ref splitScreenPageRegionName, value);
            }
        }

        private Visibility pDFViewerVisibility = Visibility.Collapsed;

        public Visibility PDFViewerVisibility
        {
            get { return pDFViewerVisibility; }
            set
            {
                SetProperty(ref pDFViewerVisibility, value);
            }
        }

        private Visibility stkpnlContentVisibility = Visibility.Visible;

        public Visibility StkpnlContentVisibility
        {
            get { return stkpnlContentVisibility; }
            set
            {
                SetProperty(ref stkpnlContentVisibility, value);
            }
        }

        /// <summary>
        /// 鼠标滚轮缩放的缩放值
        /// </summary>
        private double[] zoomLevel = { 1.00f, 10, 25, 50, 75, 100, 125, 150, 200, 300, 400, 600, 800, 1000 };

        public CPDFViewer SplitScreenPDFViewer { get; set; }
        public CPDFViewer PDFViewer { get; set; }

        private IRegionManager region;

        private IDialogService dialogs;

        private CPDFViewer historyPDFViewer = null;
        public DelegateCommand<object> AddFileCommand { get; set; }

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

        public SplitScreenContentViewModel(IRegionManager regionManager, IDialogService dialogService)
        {
            region = regionManager;
            dialogs = dialogService;
            //该区域名称 其他地方不需要调用，为减少一次打开多个文件的处理内容
            //改为随机字符串，不计入RegionNames字典里
            SplitViewRegionName = Guid.NewGuid().ToString();
            SplitScreenPageRegionName = Guid.NewGuid().ToString();
            SelectedFiles = new ObservableCollection<string>();
            //dicSelectedFiles = new Dictionary<string, string>();

            AddFileCommand = new DelegateCommand<object>(AddFileEvent);
            SelectedFilesCommand = new DelegateCommand<object>(SelectedFilesEvent);
            PDFViewerVisibility = Visibility.Visible;
            PDFViewerVisibility = Visibility.Collapsed;

            if (App.OpenedFileList != null)
            {
                if (App.OpenedFileList.Count > 0)
                {
                    foreach (var item in App.OpenedFileList)
                    {
                        string filename = Path.GetFileName(item);
                        SelectedFiles.Add(item);
                    }
                }
            }
        }

        private void SelectedFilesEvent(object obj)
        {
            if (obj is ContextMenu menu)
            {
                foreach (var item in SelectedFiles)
                {
                    MenuItem deleteMenu = new MenuItem();
                    deleteMenu.Header = Path.GetFileName(item);
                    deleteMenu.Tag = item;
                    deleteMenu.Click += SelectedFile_Click;
                    menu.Items.Add(deleteMenu);
                }
            }
        }

        private async void SelectedFile_Click(object sender, System.Windows.RoutedEventArgs e)
        {
            if (sender is MenuItem menu)
            {
                await Task.Delay(3);
                OpenPDFViewer(menu.Tag.ToString());
            }
        }

        private async void AddFileEvent(object obj)
        {
            OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.Filter = Properties.Resources.OpenDialogFilter;
            openFileDialog.Multiselect = true;
            if ((bool)openFileDialog.ShowDialog())
            {
                await Task.Delay(3);
                bool flag = obj is bool;
                OpenPDFViewer(openFileDialog.FileNames[0]);
            }
        }

        private double zoomFactor = 1;

        private void OpenPDFViewer(string fileName)
        {
            bool isHavehistory = false;

            if (historyPDFViewer != null)
            {
                isHavehistory = true;
                zoomFactor = historyPDFViewer.ZoomFactor;
                CheckViewer(SplitViewRegionName, historyPDFViewer);
            }
            if (LoadFileFormPath(fileName))
            {
                //CheckViewer(SplitViewRegionName, PDFViewer);
                region.AddToRegion(SplitViewRegionName, SplitScreenPDFViewer);

                //App.SplitScreenPDFViewer = SplitScreenPDFViewer;
                SplitScreenPDFViewer.MouseWheelZoomHandler += PdfViewer_MouseWheelZoomHandler;

                PDFViewerVisibility = Visibility.Visible;
                StkpnlContentVisibility = Visibility.Collapsed;
                OpenPageContent();

                if (isHavehistory)
                {
                    SplitScreenPDFViewer.Zoom(zoomFactor);
                }
                SetPDFViewer();
            }

            //ToolMethod.SetFileThumbImg(openFileDialog.FileNames[0]);
        }

        /// <summary>
        /// 设置视图
        /// </summary>
        private void SetPDFViewer()
        {
            if (SplitScreenPDFViewer == null)
            {
                return;
            }
            SplitScreenPDFViewer.ChangeViewMode(PDFViewer.ModeView);
            if (PDFViewer.GetDrawMode() != DrawModes.Draw_Mode_Custom)
            {
                SplitScreenPDFViewer.SetDrawMode(PDFViewer.GetDrawMode());
            }
            else
            {
                OpenFileInfo info = SettingHelper.GetFileInfo(PDFViewer.Document.FilePath);
                var color = info.LastFillBrushColor;
                var color1 = color.ToString().Substring(1, 8);
                UInt32 c = Convert.ToUInt32(color1, 16);
                SplitScreenPDFViewer.SetDrawMode(PDFViewer.GetDrawMode(), c);
            }
        }

        private void OpenPageContent()
        {
            System.Windows.Application.Current.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Send, new System.Action(() =>
            {
                //CheckViewer(SplitScreenPageRegionName, "SplitScreenPageContent");
                NavigationParameters parameters = new NavigationParameters();
                parameters.Add(ParameterNames.PDFViewer, SplitScreenPDFViewer);
                region.RequestNavigate(SplitScreenPageRegionName, "PageContent", parameters);
            }));
        }

        private void PdfViewer_MouseWheelZoomHandler(object sender, bool e)
        {
            double newZoom = CheckZoomLevel(SplitScreenPDFViewer.ZoomFactor + (e ? 0.01 : -0.01), e);
            SplitScreenPDFViewer.Zoom(newZoom);
        }

        private double CheckZoomLevel(double zoom, bool IsGrowth)
        {
            double standardZoom = 100;
            if (zoom <= 0.01)
            {
                return 0.01;
            }
            if (zoom >= 10)
            {
                return 10;
            }

            zoom *= 100;
            for (int i = 0; i < zoomLevel.Length - 1; i++)
            {
                if (zoom > zoomLevel[i] && zoom <= zoomLevel[i + 1] && IsGrowth)
                {
                    standardZoom = zoomLevel[i + 1];
                    break;
                }
                if (zoom >= zoomLevel[i] && zoom < zoomLevel[i + 1] && !IsGrowth)
                {
                    standardZoom = zoomLevel[i];
                    break;
                }
            }
            return standardZoom / 100;
        }

        /// <summary>
        /// 检查视图，删掉之前的
        /// </summary>
        /// <param name="regionName"></param>
        /// <param name="viewer"></param>
        private void CheckViewer(string regionName, object viewer)
        {
            if (region.Regions.ContainsRegionWithName(regionName))
            {
                if (region.Regions[regionName].Views.Contains(viewer))
                {
                    var contentRegion = region.Regions[regionName];
                    contentRegion.Remove(viewer);
                }
            }
        }

        /// <summary>
        /// 从文件路径创建PDFViewer对象，已包含文档解密逻辑
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        private bool LoadFileFormPath(string path)
        {
            SplitScreenPDFViewer = new CPDFViewer();
            SplitScreenPDFViewer.InitDocument(path);
            if (SplitScreenPDFViewer.Document == null)
            {
                //MessageBoxEx.Show(App.MainPageLoader.GetString("Main_OpenFileFailedWarning"));
                return false;
            }
            else
            {
                if (SplitScreenPDFViewer.Document.IsLocked)
                {
                    DialogParameters value = new DialogParameters();
                    value.Add(ParameterNames.PDFDocument, SplitScreenPDFViewer.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)
                            {
                                SplitScreenPDFViewer.Tag = e.Parameters.GetValue<string>(ParameterNames.PassWord).ToString();
                            }
                        }
                    });

                    if (SplitScreenPDFViewer.Document.IsLocked)
                    {
                        //未成功解密文档时，释放Document对象，返回
                        SplitScreenPDFViewer.Document.Release();
                        return false;
                    }
                }
            }

            SplitScreenPDFViewer.Load();
            historyPDFViewer = SplitScreenPDFViewer;

            return true;
        }

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

        public void OnNavigatedFrom(NavigationContext navigationContext)
        {
        }

        public void OnNavigatedTo(NavigationContext navigationContext)
        {
            if (navigationContext.Parameters[ParameterNames.PDFViewer] is CPDFViewer cPDFViewer)
            {
                PDFViewer = cPDFViewer; PDFViewer.InfoChanged += PDFViewer_InfoChanged;
            }
        }

        private void PDFViewer_InfoChanged(object sender, KeyValuePair<string, object> e)
        {
            if (e.Key == "ViewMode")
            {
                ViewMode ViewMode = (ViewMode)e.Value;
                SetPDFViewer();
            }
        }
    }
}