using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;
using System.Windows.Media;
using Comal.Classes;
using InABox.Clients;
using InABox.Configuration;
using InABox.Core;
using InABox.DynamicGrid;
using InABox.WPF;
using Microsoft.Win32;
using Syncfusion.UI.Xaml.Diagram;

namespace PRSDesktop
{
    /// <summary>
    ///     Interaction logic for OrganizationalChart.xaml
    /// </summary>
    public partial class OrgChartPanel : UserControl, IPanel<Employee>
    {
        private OrgChartSettings _settings;

        private readonly OrgChartDataModel model = new();

        public OrgChartPanel()
        {
            InitializeComponent();
            if (Security.IsAllowed<CanViewOrgChartByEmployee>())
                Layout.Items.Add("Employees");
            if (Security.IsAllowed<CanViewOrgChartByPosition>())
                Layout.Items.Add("Positions");
            if (Security.IsAllowed<CanViewOrgChartByRole>())
                Layout.Items.Add("Job Roles");
            Layout.Visibility = Layout.Items.Count > 1 ? Visibility.Visible : Visibility.Collapsed;
            LayoutLabel.Visibility = Layout.Visibility;
        }

        public event DataModelUpdateEvent OnUpdateDataModel;

        public bool IsReady { get; set; }

        private void SaveSettings()
        {
            //_settings.Zoom = Zoom.Value;
            _settings.Appearance = (OrgChartAppearance)Appearance.SelectedIndex;

            _settings.Layout = Equals(Layout.SelectedValue, "Employees")
                ? OrgChartLayout.Employee
                : Equals(Layout.SelectedValue, "Positions")
                    ? OrgChartLayout.Position
                    : OrgChartLayout.Role;


            Task.Run(
                () => { new UserConfiguration<OrgChartSettings>().Save(_settings); }
            );
        }

        #region IPanel Support

        public void CreateToolbarButtons(IPanelHost host)
        {
        }

        public Dictionary<string, object[]> Selected()
        {
            return new Dictionary<string, object[]>();
        }

        public void Heartbeat(TimeSpan time)
        {
        }

        public void Setup()
        {
            _settings = new UserConfiguration<OrgChartSettings>().Load();

            Appearance.SelectedIndex = (int)_settings.Appearance;
            model.Appearance = _settings.Appearance;

            var layout = _settings.Layout == OrgChartLayout.Employee
                ? "Employees"
                : _settings.Layout == OrgChartLayout.Position
                    ? "Positions"
                    : "Job Roles";
            Layout.SelectedValue = Layout.Items.Contains(layout) ? layout : Layout.Items[0];
            model.Layout = _settings.Layout;

            //Zoom.Value = _settings.Zoom;

            diagram.DataContext = model;
            (diagram.Info as IGraphInfo).ItemAdded += ApplyItemTemplate;
            model.Active = true;
        }

        public void Shutdown()
        {
        }

        public string SectionName => "Organisational Chart";

        public DataModel DataModel(Selection selection)
        {
            return new BaseDataModel<Employee>(null);
        }


        public void Refresh()
        {
            model.Refresh();
            var graphinfo = diagram.Info as IGraphInfo;
            graphinfo.Commands.FitToPage.Execute(null);
        }

        private void ApplyItemTemplate(object sender, ItemAddedEventArgs args)
        {
            var node = args.Item as NodeViewModel;
            if (node == null)
                return;
            node.ContentTemplate = TemplateGenerator.CreateDataTemplate(() =>
            {
                var image = new Border
                {
                    BorderBrush = new SolidColorBrush(Colors.Gray),
                    BorderThickness = new Thickness(0.75),
                    CornerRadius = new CornerRadius(25.0),
                    Width = 50,
                    Height = 50,
                    Margin = new Thickness(0, 0, 5, 0)
                };
                image.SetBinding(TagProperty, new Binding("ID"));
                image.SetBinding(Border.BackgroundProperty, new Binding("Image"));
                image.SetBinding(VisibilityProperty, new Binding("ImageVisible"));
                image.SetValue(Grid.ColumnProperty, 0);
                image.SetValue(Grid.RowProperty, 0);
                image.SetValue(Grid.RowSpanProperty, 2);
                image.SetValue(VerticalAlignmentProperty, VerticalAlignment.Center);

                var position = new Label();
                position.FontWeight = FontWeights.DemiBold;
                position.HorizontalContentAlignment = HorizontalAlignment.Center;
                //description.Background = new SolidColorBrush(Colors.Blue);
                position.VerticalContentAlignment = VerticalAlignment.Top;
                position.SetBinding(TagProperty, new Binding("ID"));
                position.SetBinding(ContentProperty, "Position");
                position.SetValue(Grid.ColumnProperty, 1);
                position.SetValue(Grid.RowProperty, 0);

                var name = new Label();
                //name.Background = new SolidColorBrush(Colors.Green);
                name.HorizontalContentAlignment = HorizontalAlignment.Center;
                name.VerticalContentAlignment = VerticalAlignment.Center;
                name.SetBinding(TagProperty, new Binding("ID"));
                name.SetBinding(ContentProperty, "Name");
                name.Background = new SolidColorBrush(Colors.Transparent);

                var nameborder = new Border
                {
                    BorderBrush = new SolidColorBrush(Colors.Transparent),
                    BorderThickness = new Thickness(0.75),
                    CornerRadius = new CornerRadius(5.0),
                    Padding = new Thickness(0)
                };
                nameborder.SetValue(Grid.ColumnProperty, 1);
                nameborder.SetValue(Grid.RowProperty, 1);
                nameborder.SetBinding(TagProperty, new Binding("ID"));
                nameborder.SetBinding(Border.BackgroundProperty, "WarningColor");
                nameborder.Child = name;

                var layout = new Grid();
                layout.RowDefinitions.Add(new RowDefinition { Height = new GridLength(25, GridUnitType.Pixel) });
                layout.RowDefinitions.Add(new RowDefinition { Height = new GridLength(1, GridUnitType.Auto) });
                layout.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Auto) });
                layout.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
                layout.Children.Add(image);
                layout.Children.Add(position);
                layout.Children.Add(nameborder);

                var border = new Border
                {
                    MinWidth = 150,
                    BorderBrush = new SolidColorBrush(Colors.Gray),
                    BorderThickness = new Thickness(0.75),
                    CornerRadius = new CornerRadius(5.0),
                    Padding = new Thickness(5),
                    Child = layout
                };

                border.MouseDown += Border_MouseDown;
                border.SetBinding(TagProperty, "ID");
                border.SetBinding(Border.BackgroundProperty, "Color");
                return border;
            });
        }

        #endregion

        #region Menu Actions

        private void AddExistingItemClick(object sender, RoutedEventArgs e)
        {
            var entry = (sender as MenuItem).Tag as System.Tuple<OrgChartEntry, OrgChartEntry>;
            entry.Item2.ParentID = entry.Item1.ID;
            entry.Item2.Visible = true;
            UpdateItems(new[] { entry.Item2 });
        }

        private void CreateNewItemClick(object sender, RoutedEventArgs e)
        {
            var menu = sender as MenuItem;

            var parent = menu.Tag as OrgChartEntry;
            var entry = new OrgChartEntry { ParentID = parent != null ? parent.ID : Guid.Empty };
            EditItem(entry);
        }

        private void EditItemClick(object sender, RoutedEventArgs e)
        {
            var entry = (sender as MenuItem).Tag as OrgChartEntry;
            EditItem(entry);
        }

        private void RemoveItemClick(object sender, RoutedEventArgs e)
        {
            var entry = (sender as MenuItem).Tag as OrgChartEntry;
            var updates = model.Data.Where(x => x.ParentID == entry.ID).ToList();
            foreach (var child in updates)
                child.ParentID = entry.ParentID;
            entry.ParentID = Guid.Empty;
            entry.Visible = false;
            updates.Add(entry);
            UpdateItems(updates);
        }

        private void ChanegColorClick(object sender, RoutedEventArgs e)
        {
            var entry = (sender as MenuItem).Tag as OrgChartEntry;
            var color = ImageUtils.StringToColor(entry.Color);
            if (ColorEdit.Execute("Change Color", ref color))
            {
                entry.Color = ImageUtils.ColorToString(color);
                UpdateItems(new[] { entry });
            }
        }

        private void StartNewTreeClick(object sender, RoutedEventArgs e)
        {
            var entry = (sender as MenuItem).Tag as OrgChartEntry;
            entry.ParentID = Guid.Empty;
            UpdateItems(new[] { entry });
        }

        private void MoveToClick(object sender, RoutedEventArgs e)
        {
            var entry = (sender as MenuItem).Tag as System.Tuple<OrgChartEntry, OrgChartEntry>;
            entry.Item1.ParentID = entry.Item2.ID;
            UpdateItems(new[] { entry.Item1 });
        }

        private void EditItem(OrgChartEntry entry)
        {
            if (_settings.Layout == OrgChartLayout.Employee)
            {
                var employee = entry.ID == Guid.Empty
                    ? new Employee()
                    : new Client<Employee>().Load(new Filter<Employee>(x => x.ID).IsEqualTo(entry.ID)).FirstOrDefault();
                if (employee != null)
                {
                    if (employee.ID == Guid.Empty)
                        employee.OrgChart.ReportsTo.ID = entry.ID;
                    var bOK = new EmployeeGrid().EditItems(new[] { employee });
                    if (bOK)
                        model.Refresh();
                }
                else
                {
                    MessageBox.Show("Unable to Locate Employee!");
                }
            }
            else if (_settings.Layout == OrgChartLayout.Position)
            {
                var position = entry.ID == Guid.Empty
                    ? new EmployeePosition()
                    : new Client<EmployeePosition>().Load(new Filter<EmployeePosition>(x => x.ID).IsEqualTo(entry.ID)).FirstOrDefault();
                if (position != null)
                {
                    if (position.ID == Guid.Empty)
                        position.OrgChart.ReportsTo.ID = entry.ID;
                    var bOK = new DynamicDataGrid<EmployeePosition>().EditItems(new[] { position });
                    if (bOK)
                        model.Refresh();
                }
                else
                {
                    MessageBox.Show("Unable to Locate Position!");
                }
            }
            else if (_settings.Layout == OrgChartLayout.Role)
            {
                var role = entry.ID == Guid.Empty
                    ? new Role()
                    : new Client<Role>().Load(new Filter<Role>(x => x.ID).IsEqualTo(entry.ID)).FirstOrDefault();
                if (role != null)
                {
                    if (role.ID == Guid.Empty)
                        role.OrgChart.ReportsTo.ID = entry.ID;
                    var bOK = new DynamicDataGrid<Role>().EditItems(new[] { role });
                    if (bOK)
                        model.Refresh();
                }
                else
                {
                    MessageBox.Show("Unable to Locate Role!");
                }
            }
        }

        private void UpdateItems(IEnumerable<OrgChartEntry> entries)
        {
            if (_settings.Layout == OrgChartLayout.Employee)
            {
                var updates = new List<Employee>();
                foreach (var entry in entries)
                {
                    var update = new Employee();
                    update.ID = entry.ID;
                    update.OrgChart.ReportsTo.ID = entry.ParentID;
                    update.OrgChart.Color = entry.Color;
                    update.OrgChart.Visible = entry.Visible;
                    updates.Add(update);
                }

                using (new WaitCursor())
                {
                    new Client<Employee>().Save(updates, "Updated from Org Chart");
                    //model.Refresh();
                }
            }
            else if (_settings.Layout == OrgChartLayout.Position)
            {
                var updates = new List<EmployeePosition>();
                foreach (var entry in entries)
                {
                    var update = new EmployeePosition();
                    update.ID = entry.ID;
                    update.OrgChart.ReportsTo.ID = entry.ParentID;
                    update.OrgChart.Color = entry.Color;
                    update.OrgChart.Visible = entry.Visible;
                    updates.Add(update);
                }

                using (new WaitCursor())
                {
                    new Client<EmployeePosition>().Save(updates, "Updated from Org Chart");
                    //model.Refresh();
                }
            }
            else if (_settings.Layout == OrgChartLayout.Role)
            {
                var updates = new List<Role>();
                foreach (var entry in entries)
                {
                    var update = new Role();
                    update.ID = entry.ID;
                    update.OrgChart.ReportsTo.ID = entry.ParentID;
                    update.OrgChart.Color = entry.Color;
                    update.OrgChart.Visible = entry.Visible;
                    updates.Add(update);
                }

                using (new WaitCursor())
                {
                    new Client<Role>().Save(updates, "Updated from Org Chart");
                    //model.Refresh();
                }
            }

            diagram.Visibility = Visibility.Collapsed;
            model.Refresh();
            diagram.Visibility = Visibility.Visible;
        }

        #endregion

        #region Menu Setup

        private void LoadNewItemsMenu(ItemsControl menu)
        {
            menu.Items.Clear();
            var parent = menu.Tag as OrgChartEntry;
            foreach (var entry in model.Data.Where(x => x.Visible == false))
            {
                var item = new MenuItem { Header = _settings.Layout == OrgChartLayout.Employee ? entry.Name : entry.Position };
                item.Click += AddExistingItemClick;
                item.Tag = new System.Tuple<OrgChartEntry, OrgChartEntry>(parent, entry);
                menu.Items.Add(item);
            }
        }

        private void LoadMoveToOptions(OrgChartEntry current, MenuItem moveto)
        {
            foreach (var entry in model.Data.OrderBy(x => x.Name))
                if (!model.Data.IsChildOf(entry, current))
                {
                    var item = new MenuItem { Header = _settings.Layout == OrgChartLayout.Employee ? entry.Name : entry.Position };
                    item.Tag = new System.Tuple<OrgChartEntry, OrgChartEntry>(current, entry);
                    item.Click += MoveToClick;
                    moveto.Items.Add(item);
                }

            if (moveto.Items.Count > 0 && current.ParentID != Guid.Empty)
                moveto.Items.Add(new Separator());

            if (current.ParentID != Guid.Empty)
            {
                var noone = new MenuItem { Header = "Start New Tree" };
                noone.Click += StartNewTreeClick;
                noone.Tag = current;
                moveto.Items.Add(noone);
            }
        }

        private void Diagram_MouseDown(object sender, MouseButtonEventArgs e)
        {
            if (e.RightButton == MouseButtonState.Pressed && Security.IsAllowed<CanEditOrgChart>())
            {
                var menu = new ContextMenu();
                var additem = new MenuItem { Header = "Add Existing" };
                LoadNewItemsMenu(additem);
                additem.IsEnabled = additem.Items.Count > 0;
                menu.Items.Add(additem);

                menu.Items.Add(new Separator());

                var createitem = new MenuItem { Header = "Create New" };
                createitem.Click += CreateNewItemClick;
                menu.Items.Add(createitem);
                menu.IsOpen = true;
            }
        }

        private void Border_MouseDown(object sender, MouseButtonEventArgs e)
        {
            if (e.RightButton == MouseButtonState.Pressed && Security.IsAllowed<CanEditOrgChart>())
            {
                var id = (Guid)(sender as Border).Tag;
                var current = model.Data.FirstOrDefault(x => x.ID == id);

                if (current == null)
                    return;
                e.Handled = true;

                if (e.ClickCount == 2)
                {
                    EditItem(current);
                }
                else
                {
                    var menu = new ContextMenu();
                    var moveto = new MenuItem { Header = "Move To.." };
                    menu.Items.Add(moveto);
                    LoadMoveToOptions(current, moveto);

                    var changecolor = new MenuItem { Header = "Change Color" };
                    changecolor.Click += ChanegColorClick;
                    changecolor.Tag = current;
                    menu.Items.Add(changecolor);

                    var edititem = new MenuItem { Header = "Edit Properties" };
                    edititem.Click += EditItemClick;
                    edititem.Tag = current;
                    menu.Items.Add(edititem);

                    menu.Items.Add(new Separator());

                    var additem = new MenuItem { Header = "Add Existing" };
                    menu.Items.Add(additem);
                    LoadNewItemsMenu(additem);
                    additem.IsEnabled = additem.Items.Count > 0;

                    var newitem = new MenuItem { Header = "Create New" };
                    newitem.Click += CreateNewItemClick;
                    menu.Items.Add(newitem);

                    menu.Items.Add(new Separator());

                    var removeitem = new MenuItem { Header = "Remove" };
                    removeitem.Click += RemoveItemClick;
                    removeitem.Tag = current;
                    menu.Items.Add(removeitem);

                    menu.IsOpen = true;
                }
            }
        }

        #endregion

        #region Toolbar Actions

        private void Zoom_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
        {
            if (diagram == null)
                return;

            //if (model.Active)
            //    SaveSettings();

            var graphinfo = diagram.Info as IGraphInfo;
            graphinfo.Commands.Zoom.Execute(new ZoomPositionParameter
            {
                ZoomCommand = ZoomCommand.Zoom,
                ZoomTo = e.NewValue / 100
            });
        }

        private void PrintButton_Click(object sender, RoutedEventArgs e)
        {
            if (diagram == null)
                return;

            diagram.PrintingService.ShowDialog = true;
            diagram.PrintingService.Print();
        }

        private void ExportButton_Click(object sender, RoutedEventArgs e)
        {
            if (diagram == null)
                return;

            var dlg = new SaveFileDialog();
            dlg.Filter = "PNG Files (*.png)|*.png|PDF Files (*.pdf)|*.pdf";
            dlg.FilterIndex = 0;
            dlg.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
            dlg.FileName = Path.Combine(dlg.InitialDirectory, "Organizational Chart.png");
            if (dlg.ShowDialog() == true)
            {
                var tempfile = Path.GetTempFileName();
                var finalfile = Path.ChangeExtension(dlg.FileName, dlg.FilterIndex > 1 ? "pdf" : "png");
                diagram.ExportSettings = new ExportSettings
                {
                    IsSaveToXps = dlg.FilterIndex > 1,
                    FileName = dlg.FilterIndex > 1 ? tempfile : finalfile,
                    ExportMode = ExportMode.Content
                };
                diagram.Export();
                if (dlg.FilterIndex > 1)
                {
                    MessageBox.Show("PDF Functions broken .in .NET6");
                    return;
                    // XPSToPdfConverter converter = new XPSToPdfConverter();
                    // PdfDocument pdfDocument = converter.Convert(tempfile);
                    // pdfDocument.Save(finalfile);
                    // pdfDocument.Close(true);
                    // System.IO.File.Delete(tempfile);
                }

                Process.Start(finalfile);
            }
        }

        private void Appearance_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (model.Active)
                SaveSettings();

            model.Appearance = (OrgChartAppearance)Appearance.SelectedIndex;
        }

        private void Layout_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (model.Active)
                SaveSettings();

            model.Layout = _settings != null ? _settings.Layout : OrgChartLayout.Employee;
        }

        #endregion
    }
}