using ComPDFKitViewer;
using ComPDFKitViewer.AnnotEvent;
using ComPDFKitViewer.PdfViewer;
using PDF_Master.CustomControl;
using PDF_Master.EventAggregators;
using PDF_Master.Helper;
using PDF_Master.Model;
using PDF_Master.ViewModels;
using PDF_Master.ViewModels.BOTA;
using PDF_Master.ViewModels.PropertyPanel.ViewModular;
using PDF_Master.ViewModels.Tools;
using PDF_Master.Views.BOTA;
using PDF_Master.Views.Dialog;
using PDF_Master.Views.PageEdit;
using PDF_Master.Views.PropertyPanel.ViewModular;
using PDF_Master.Views.Tools;
using Prism.Events;
using Prism.Regions;
using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Threading;

namespace PDF_Master.Views
{
    /// <summary>
    /// Interaction logic for ViewContent
    /// </summary>
    public partial class ViewContent : UserControl
    {
        private ViewContentViewModel viewModel = null;

        private string unicode = "";

        /// <summary>
        /// 是否是展开工具栏
        /// </summary>
        private bool expandToolRow = true;

        private bool DelayIsEnable = true;

        public ViewContent()
        {
            InitializeComponent();
            unicode = App.mainWindowViewModel.SelectedItem.Unicode;
            viewModel = (ViewContentViewModel)this.DataContext;
            ScrViewTab.Margin = new Thickness(CalculateStackPanelWidth(Leftpanel)+16, 0,  CalculateStackPanelWidth(Rightpanel)+16,0);
            viewModel.PropertyChanged += ViewModel_PropertyChanged;
        }
        /// <summary>
        /// 计算StackPane的宽度
        /// </summary>
        /// <param name="stackPanel"></param>
        /// <returns></returns>
        public double CalculateStackPanelWidth(StackPanel stackPanel)
        {
            double totalWidth = 0;

            foreach (UIElement child in stackPanel.Children)
            {
                child.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
                totalWidth += child.DesiredSize.Width;
            }

            return totalWidth;
        }
        private void ViewModel_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
            if (e.PropertyName == "OpenBOTA")
            {
                if (!viewModel.OpenBOTA)
                {
                    //动态改变BOTA的最小宽度只能在这里设置，VM里绑定会有异常
                    BOTACloumn.MinWidth = 48;
                    viewModel.BOTAWidth = new GridLength(48);
                    BOTASplitter.Visibility = Visibility.Collapsed;
                }
                else
                {
                    BOTACloumn.MinWidth = viewModel.BOTAMiniWidth;
                    BOTASplitter.Visibility = Visibility.Visible;
                }
            }
        }

        public ViewContent(IEventAggregator eventAggregator) : this()
        {
            eventAggregator.GetEvent<SplitEvent>().Subscribe(ChangeSplitModeUI, e => e.Unicode == unicode);

            eventAggregator.GetEvent<ReadModeEvent>().Subscribe(ChangeReadModeUI, e => e.Unicode == unicode);

            eventAggregator.GetEvent<ReadModePropertyOpenEvent>().Subscribe(ChangeReadModePropertyOpenUI, e => e.Unicode == unicode);
        }

        private void ChangeReadModePropertyOpenUI(ReadModePropertyOpenArgs obj)
        {
            viewModel.ReadModeIsShowProperty = true;
            Grid.SetColumnSpan(GridViewer, 3);
            Grid.SetColumn(GridViewer, 0);
            Grid.SetColumn(Scroller, 4);
        }

        private void ChangeReadModeUI(ReadModeArgs obj)
        {
            if (obj.IsReadMode)
            {
                ReadModeContent.Visibility = Visibility.Visible;
                RectangleReadMode.Visibility = Visibility.Collapsed;
                // 是否悬停显示阅读模式翻页控件，防止在其他区域遮挡部分功能
                RectangleReadMode.IsHitTestVisible = true;
                //因为ispropertyOpen 属性改成了单向控制  因此这里的语句不再适用
                //this.TbtnProperty.IsChecked = false;
                Grid.SetRowSpan(DocumentView, 4);
                Grid.SetRow(DocumentView, 0);
                Grid.SetColumn(GridViewer, 0);
                Grid.SetColumnSpan(GridViewer, 4);
                //var annotArgs = new SelectToolArgs();
                //viewModel.PDFViewer.SetToolParam(annotArgs);

                #region to do

                //Grid.SetRowSpan(RectangleBota, 4);
                //Grid.SetRow(RectangleBota, 0);

                //RectangleBota.Visibility = Visibility.Visible;

                #endregion to do
            }
            else
            {
                ReadModeContent.Visibility = Visibility.Collapsed;
                RectangleReadMode.Visibility = Visibility.Collapsed;
                RectangleReadMode.IsHitTestVisible = false;
                //this.TbtnProperty.IsChecked=true;
                Grid.SetRowSpan(DocumentView, 1);
                Grid.SetRow(DocumentView, 2);
                Grid.SetColumn(GridViewer, 2);
                Grid.SetColumnSpan(GridViewer, 1);
                //var annotArgs = new SelectToolArgs();
                //viewModel.PDFViewer.SetToolParam(annotArgs);

                #region to do

                //Grid.SetRowSpan(RectangleBota, 1);
                //Grid.SetRow(RectangleBota, 2);

                //RectangleBota.Visibility = Visibility.Visible;

                //Panel.SetZIndex(BOTAContent, 0);
                //Panel.SetZIndex(BOTASplitter, 0);

                #endregion to do
            }
        }

        private void RectangleBota_MouseEnter(object sender, MouseEventArgs e)
        {
            if (viewModel.mainViewModel.IsBookMode)
            {
                RectangleBota.Visibility = Visibility.Collapsed;

                BOTAContent.Visibility = Visibility.Visible;
                Panel.SetZIndex(BOTAContent, 2);
                Panel.SetZIndex(BOTASplitter, 2);

                ReadModeContent.Visibility = Visibility.Visible;
                RectangleReadMode.Visibility = Visibility.Collapsed;
                //因为ispropertyOpen 属性改成了单向控制  因此这里的语句不再适用
                //this.TbtnProperty.IsChecked = false;
                Grid.SetRowSpan(DocumentView, 4);
                Grid.SetRow(DocumentView, 0);
                Grid.SetColumnSpan(GridViewer, 1);
                Grid.SetColumn(GridViewer, 2);

                Grid.SetColumnSpan(BOTAContent, 1);
                Grid.SetColumn(BOTAContent, 0);

                Grid.SetColumnSpan(BOTASplitter, 1);
                Grid.SetColumn(BOTASplitter, 1);

                Grid.SetRowSpan(RectangleBota, 4);
                Grid.SetRow(RectangleBota, 0);
            }
            else
            {
            }
        }

        private void GridViewer_MouseEnter(object sender, MouseEventArgs e)
        {
            if (viewModel.mainViewModel.IsBookMode)
            {
                ReadModeContent.Visibility = Visibility.Visible;
                RectangleReadMode.Visibility = Visibility.Collapsed;
                //因为ispropertyOpen 属性改成了单向控制  因此这里的语句不再适用
                //this.TbtnProperty.IsChecked = false;
                Grid.SetRowSpan(DocumentView, 4);
                Grid.SetRow(DocumentView, 0);

                Grid.SetRowSpan(RectangleBota, 4);
                Grid.SetRow(RectangleBota, 0);

                Panel.SetZIndex(BOTAContent, 0);
                Panel.SetZIndex(BOTASplitter, 0);

                RectangleBota.Visibility = Visibility.Visible;

                if (viewModel.ReadModeIsShowProperty)
                {
                    Grid.SetColumnSpan(GridViewer, 3);
                    Grid.SetColumn(GridViewer, 0);
                    Grid.SetColumn(Scroller, 4);
                }
                else
                {
                    Grid.SetColumnSpan(GridViewer, 4);
                    Grid.SetColumn(GridViewer, 0);
                }
            }
        }

        /// <summary>
        /// 鼠标移动到控件范围时显示控件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void RectangleReadMode_MouseEnter(object sender, MouseEventArgs e)
        {
            //Dispatcher.BeginInvoke(DispatcherPriority.Send, new Action(delegate
            //{
            if (viewModel.mainViewModel.IsBookMode)
            {
                DelayIsEnable = false;
                this.ReadModeContent.Visibility = Visibility.Visible;
                this.RectangleReadMode.Visibility = Visibility.Collapsed;
            }
            //}));
        }

        /// <summary>
        /// 鼠标移开页面控件，三秒后隐藏该控件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private async void ReadModeContent_MouseLeave(object sender, MouseEventArgs e)
        {
            DelayIsEnable = true;
            await System.Threading.Tasks.Task.Delay(3000);
            //Thread.Sleep(3000);
            if (DelayIsEnable)
            {
                this.ReadModeContent.Visibility = Visibility.Collapsed;
                this.RectangleReadMode.Visibility = Visibility.Visible;
            }
        }

        /// <summary>
        /// 根据Vm事件通知处理分屏布局的事件
        /// </summary>
        /// <param name="e"></param>
        private void ChangeSplitModeUI(SplitEventArgs e)
        {
            switch (e.Mode)
            {
                case EventAggregators.SplitMode.Horizontal:
                    //水平分屏  上下
                    HorizontalSplitter.Visibility = Visibility.Visible;
                    VerticalSplitter.Visibility = Visibility.Collapsed;

                    RowRight.Height = new GridLength(1, GridUnitType.Star);
                    ColumnBottom.Width = new GridLength(0);

                    Grid.SetColumn(SplitPDFViewer, 0);
                    Grid.SetRow(SplitPDFViewer, 2);
                    break;

                case EventAggregators.SplitMode.Vertical:

                    HorizontalSplitter.Visibility = Visibility.Collapsed;
                    VerticalSplitter.Visibility = Visibility.Visible;
                    RowRight.Height = new GridLength(0);
                    ColumnBottom.Width = new GridLength(1, GridUnitType.Star);
                    Grid.SetColumn(SplitPDFViewer, 2);
                    Grid.SetRow(SplitPDFViewer, 0);
                    break;

                case EventAggregators.SplitMode.Single:
                default:
                    //退出分屏模式
                    HorizontalSplitter.Visibility = Visibility.Collapsed;
                    VerticalSplitter.Visibility = Visibility.Collapsed;
                    RowRight.Height = new GridLength(0, GridUnitType.Star);
                    ColumnBottom.Width = new GridLength(0, GridUnitType.Star);
                    break;
            }
            GridViewer.UpdateLayout();
        }

        /// <summary>
        /// 退出阅读模式
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void UserControl_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
        {
            if (Key.Escape == e.Key)
            {
                if (viewModel != null)
                {
                    if (viewModel.PDFViewer.MouseMode != MouseModes.PanTool)
                    {
                        if (this.ContentToolsBar.Content is AnnotToolContent annotTool)
                        {
                            if (annotTool.BtnSelecttool.IsChecked == true)
                            {
                                AnnotToolContentViewModel model = (AnnotToolContentViewModel)annotTool.DataContext;
                                if (model != null)
                                {
                                    if (model.SnapshotEditMenuViewModel.SnapToolArgs != null)
                                    {
                                        model.SnapshotEditMenuViewModel.SnapToolArgs.ReSnapshot();
                                    }
                                }
                            }
                        }
                        if (viewModel.mainViewModel.IsBookMode == true)
                        {
                            viewModel.Off_ReadModel();
                        }
                    }
                    else
                    {
                        if (viewModel.mainViewModel.IsBookMode == true)
                        {
                            viewModel.Off_ReadModel();
                        }
                    }
                }
            }
        }

        private void BtnFile_Initialized(object sender, EventArgs e)
        {
            BtnFile.ContextMenu = null;
        }

        private void BtnFile_Click(object sender, RoutedEventArgs e)
        {
            FileMenu.PlacementTarget = BtnFile;
            FileMenu.Placement = System.Windows.Controls.Primitives.PlacementMode.Bottom;
            FileMenu.IsOpen = true;
        }

        private void BtnMore_Initialized(object sender, EventArgs e)
        {
            BtnMore.ContextMenu = null;
        }

        private void BtnMore_Click(object sender, RoutedEventArgs e)
        {
            MenuMore.PlacementTarget = BtnMore;
            MenuMore.Placement = System.Windows.Controls.Primitives.PlacementMode.Bottom;
            MenuMore.IsOpen = true;
        }

        private void ContentControl_SizeChanged(object sender, SizeChangedEventArgs e)
        {
        }

        private void MenuRecent_Loaded(object sender, RoutedEventArgs e)
        {
            int count = 0;
            MenuRecent.Items.Clear();
            foreach (var file in Properties.Settings.Default.RecentOpenFiles)
            {
                MenuItem item = new MenuItem();
                item.Height = 32;
                item.Header = file.FileName;
                item.Tag = file.FilePath;
                item.ToolTip = file.FilePath;

                item.Click += RecentItem_Click;
                MenuRecent.Items.Insert(MenuRecent.Items.Count, item);

                count++;
                if (count >= 20)
                    break;
            }

            if (Properties.Settings.Default.RecentOpenFiles.Count > 0)
            {
                MenuRecent.Items.Add(Menu_Separator);
                MenuRecent.Items.Add(MenuDeleteAll);
                MenuDeleteAll.IsEnabled = true;
                MenuDeleteAll.Opacity = 1;
            }
            else
            {
                MenuRecent.Items.Add(MenuDeleteAll);
                MenuDeleteAll.IsEnabled = false;
                MenuDeleteAll.Opacity = 0.5;
            }
        }

        private void RecentItem_Click(object sender, RoutedEventArgs e)
        {
            var item = sender as MenuItem;
            string[] filePath = new string[1];
            filePath[0] = item.Tag.ToString();
            if (App.OpenedFileList.Contains(filePath[0]))
            {
                (this.DataContext as ViewContentViewModel).mainViewModel.mainWindowViewModel.SelectItem(filePath[0]);
            }
            else
            {
                (this.DataContext as ViewContentViewModel).mainViewModel.mainWindowViewModel.AddTabItem(filePath[0]);
            }
        }

        private void MenuDeleteAll_Click(object sender, RoutedEventArgs e)
        {
            SettingHelper.RemoveAllRecentOpenFiles();
        }

        private void UserControl_DragEnter(object sender, DragEventArgs e)
        {
            DragDropHelper.DragEnter(this, e);
        }

        private void UserControl_DragOver(object sender, DragEventArgs e)
        {
            DragDropHelper.DragOver(this, e);
        }

        private void UserControl_DragLeave(object sender, DragEventArgs e)
        {
            DragDropHelper.DragLeave();
        }

        private void UserControl_Drop(object sender, DragEventArgs e)
        {
            try
            {
                DragDropHelper.Drop(this, e);

                //页面编辑模式下，拖动文件到页面编辑的Listbox时，不运行打开文件的逻辑
                //拖动到页面编辑的Listbox上方空白处时，打开文件
                if (viewModel.isInPageEdit)
                {
                    var pos2 = e.GetPosition(this);
                    var result2 = VisualTreeHelper.HitTest(this, pos2);
                    if (result2 != null)
                    {
                        var pageEdite = CommonHelper.FindVisualParent<PageEditContent>(result2.VisualHit);
                        var pageEdite1 = CommonHelper.FindVisualChild<PageEditContent>(result2.VisualHit);
                    }
                    // 暂时 用遍历 的方法，找PageEditContent，缺点=》有点耗时，非最优方案，后续有较好的方案可补充修改
                    viewModel.FindPageEditContent(out PageEditContent pageEditContent);
                    if (pageEditContent != null)
                    {
                        var pos1 = e.GetPosition(pageEditContent);
                        var result1 = VisualTreeHelper.HitTest(pageEditContent, pos1);
                        if (result1 == null)
                        {
                            OpenDocument(e);
                        }
                        else
                        {
                            pos1 = e.GetPosition(pageEditContent.GridHeader);
                            result1 = VisualTreeHelper.HitTest(pageEditContent.GridHeader, pos1);
                            if (result1 != null)
                            {
                                OpenDocument(e);
                            }
                        }
                    }
                }
                else
                {
                    bool isTabItemThumbnail = viewModel.IsBOTATabItemShow(out BOTAContentViewModel bOTAContentViewModel, out BOTAContent bOTAContent, "TabItemThumbnail");
                    //BOTA缩略图和页面编辑拖动中时，不响应拖拽打开文件
                    //因为目前页面编辑支持拖拽到桌面生成文件，也会是FileDrop类型，所以通过鼠标坐标点判断是否在缩略图区域
                    if (isTabItemThumbnail)
                    {
                        var pos = e.GetPosition(BOTAContent);
                        var result = VisualTreeHelper.HitTest(BOTAContent, pos);
                        if (result == null)
                        {
                            //BOTA缩略图和页面编辑拖动中时，不响应拖拽打开文件
                            //因为目前页面编辑支持拖拽到桌面生成文件，也会是FileDrop类型，暂时只能通过DragDropEffects来区分app内的拖拽和外部文件拖入(外部文件拖入是多个操作类型)

                            //if (file != null && file.Length > 0 && flag == false && e.AllowedEffects != DragDropEffects.Copy)
                            //{
                            //    if (!App.OpenedFileList.Contains(file[0]))
                            //    {
                            //        App.mainWindowViewModel.AddTab.Execute();
                            //    }
                            //    (App.mainWindowViewModel.SelectedItem.DataContext as MainContentViewModel).homeContentViewModel.AddFileFromDrag(file.ToList());
                            //}
                            OpenDocument(e);
                        }
                    }
                    else
                    {
                        OpenDocument(e);
                    }
                }
                //var pos = e.GetPosition(this);
                //var result = VisualTreeHelper.HitTest(this, pos);
                //var listbox = CommonHelper.FindVisualParent<ListBox>(result.VisualHit);
                //if (listbox != null)
                //{
                //    return;
                //}
                ////BOTA缩略图和页面编辑拖动中时，不响应拖拽打开文件
                ////因为目前页面编辑支持拖拽到桌面生成文件，也会是FileDrop类型，暂时只能通过DragDropEffects来区分app内的拖拽和外部文件拖入(外部文件拖入是多个操作类型)
                //OpenDocument(e);
            }
            catch { }
        }

        private void OpenDocument(DragEventArgs e)
        {
            string[] file = (string[])e.Data.GetData(DataFormats.FileDrop);
            if (file != null && file.Length > 0 && e.AllowedEffects != DragDropEffects.Copy)
            {
                if (!App.OpenedFileList.Contains(file[0]))
                {
                    App.mainWindowViewModel.AddTab.Execute();
                }
               (App.mainWindowViewModel.SelectedItem.DataContext as MainContentViewModel).homeContentViewModel.AddFileFromDrag(file.ToList());
            }
        }

        private void CloseLeftCommand_Executed(object sender, ExecutedRoutedEventArgs e)
        {
            viewModel.OpenBOTA = false;
        }

        private void CloseRightCommand_Executed(object sender, ExecutedRoutedEventArgs e)
        {
            viewModel.ClosePropertyCommand.Execute();
        }

        private void UserControl_Unloaded(object sender, RoutedEventArgs e)
        {
            viewModel.CloseAutoSave();
        }

        private void ToolTabControl_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            var visual = VisualTreeHelper.HitTest(ToolTabControl, e.GetPosition(ToolTabControl));
            if (visual == null)
            {
                return;
            }
            var item = CommonHelper.FindVisualParent<TabItem>(visual.VisualHit);
            if (item == null)
            {
                return;
            }

            //默认展开子工具栏
            //单击工具栏工具展开子工具栏；再次单击工具栏工具则收起子工具栏
            if (item.IsSelected && item.Name != "TabItemPageEdit")
            {
                expandToolRow = !expandToolRow;
                ToolRow.Height = expandToolRow ? new GridLength(40) : new GridLength(0);
                //取消选中
                item.IsSelected = false;
                //修复第一次打开文档后，第一次点击收起工具栏异常问题
                e.Handled = true;
            }
            else
            {
                if (ToolRow.Height == new GridLength(0))
                {
                    //点击其他菜单栏时,之前为折叠状态时，自动展开
                    expandToolRow = !expandToolRow;
                    ToolRow.Height = new GridLength(40);
                }
                //取消选中
                item.IsSelected = true;
            }
        }

        private void AddTabCommand_Executed(object sender, ExecutedRoutedEventArgs e)
        {
            viewModel.mainViewModel.mainWindowViewModel.AddTab.Execute();
        }

        private void CloseTabCommand_Executed(object sender, ExecutedRoutedEventArgs e)
        {
            viewModel.mainViewModel.CloseTab.Execute(null);
        }

        private void UserControl_MouseDown(object sender, MouseButtonEventArgs e)
        {
            //鼠标侧键无法在Xaml里绑定  因此写在后台代码里
            if (e.ChangedButton == MouseButton.XButton2)
            {
                viewModel.bottom?.NextViewCommnad.Execute();
            }
            else if (e.ChangedButton == MouseButton.XButton1)
            {
                viewModel.bottom?.PreViewCommand.Execute();
            }
        }

        private void ButLeft_Click(object sender, RoutedEventArgs e)
        {
            ScrViewTab.LineLeft();
        }

        private void ButRight_Click(object sender, RoutedEventArgs e)
        {
            ScrViewTab.LineRight();
        }

        private void ScrViewTab_ScrollChanged(object sender, ScrollChangedEventArgs e)
        {
            if (e.ViewportWidth < 384)
            {
                ButLeft.Visibility = Visibility.Visible;
                ButRight.Visibility = Visibility.Visible;
            }
            else
            {
                ButLeft.Visibility = Visibility.Collapsed;
                ButRight.Visibility = Visibility.Collapsed;
            }
        }

        private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            //自动聚焦，修复快捷键无响应的问题
            this.Focusable = true;
            this.Focus();
        }

        private void ToolTabControl_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            //禁用控件的左右按键，避免和左右翻页快捷键冲突
            if (e.Key == Key.Left || e.Key == Key.Right || e.Key == Key.Tab)
            {
                e.Handled = true;
            }
        }

        private void MenuItem_Click(object sender, RoutedEventArgs e)
        {
            //检查更新
            if (App.SparkleUpdateDetector != null)
                App.SparkleUpdateDetector?.CheckForUpdatesAtUserRequest();
        }

        private void BOTASplitter_PreviewMouseUp(object sender, MouseButtonEventArgs e)
        {
            if(e.GetPosition(this).X<viewModel.BOTAMiniWidth)
            {
                //需要拦截控件本身关于拖拽事件后的操作，才能响应关闭BOTA的逻辑
                e.Handled = true;
                viewModel.OpenBOTA = false;
            }
        }
    }
}