using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Windows;
using System.Windows.Data;

using BeWo.Core.Service;
using BeWo.ServiceProxy;
using BeWo.Validation;
using BeWo.ViewModel;
using BeWo.ViewModel.ListViewModel;

using BS.Shared;
using BS.Shared.Extensions;
using DevExpress.Xpf.Grid;

namespace BeWo.View.Detail
{
    public partial class TextModuleView
    {
		private TextModuleListVM _ViewModel;

        public TextModuleListVM ViewModel
        {
            get => _ViewModel;

            set
            {
                _ViewModel = value;
                root.DataContext = _ViewModel;
            }
        }

        public override bool IsDirty => ViewModel != null && ViewModel.IsDirty;

	    internal override DependencyObject ValidationOnSaveRootElement => AddTextModuleButton;

	    public bool IsInAdministrationView { get; }

	    public bool AreUserControlsEnabled => IsInAdministrationView ? BeWoApp.LoggedOnUser.HasRight(UserRightType.TextbausteineAlleBearbeiten) : BeWoApp.LoggedOnUser.HasRight(UserRightType.TextbausteineNurEigeneBearbeiten);

	    public TextModuleView(TextModuleListVM pViewModel, bool pIsInAdministrationView = false)
        {
            InitializeComponent();

            IsInAdministrationView = pIsInAdministrationView;

            ViewModel = pViewModel;
        }

        public void Save(Action pCallBack)
        {
            var lToDos = new List<Action<IOperationsService>>();

            if (ViewModel.AddedCount > 0)
            {
	            ViewModel.NewVM.IsOnlyForEmployee = true;
                lToDos.Add(s => s.InsertNewTextModules(ViewModel.CommitAdded()));
            }

            if (ViewModel.RemovedCount > 0)
            {
                lToDos.Add(s => s.DeleteTextModules(ViewModel.GetRemoved().ToDictionary(dc => dc.TextModuleOid.Value, dc => dc.TextModuleVersion.Value)));
            }

            if (ViewModel.ChangedCount > 0)
            {
                lToDos.Add(s => s.UpdateTextModules(ViewModel.CommitChanged()));
            }

            ServiceFacade.DoMultipleOperationsServicesAsync(lToDos, pCallBack);
        }

	    protected override void Save()
	    {
		    Save(ReloadViewModel);
	    }

        private void ReloadViewModel()
        {
            Cache.GetInstance().ClearServiceCategoryDescriptions();
            VMFactory.CreateTextModuleListVMAsync(r => this.Dispatch(delegate
            {
                ViewModel = r;

				TreeListControl.UpdateLayout();
            }), IsInAdministrationView, true);
        }
		
		private void DeleteButton_Click(object sender, RoutedEventArgs e)
        {
	        var focusedNode = TreeListView.FocusedNode;
	        var selectedTextModule = (TextModuleVM) focusedNode.Content;

			childrenToDelete.Add(selectedTextModule);

	        if(selectedTextModule.IsParent)
	        {
		        if(ViewModel.VMList.Any(textModule => selectedTextModule.Equals(textModule.Parent)))
		        {
			        if(MessageBox.Show("Die Textbausteinkategorie enthält weitere Textbausteine und/oder Textbausteinkategorien. Wenn Sie fortfahren, werden alle Unterelemente von \"" + selectedTextModule.Name + "\" gelöscht.", "Textbausteine löschen", MessageBoxButton.OKCancel, MessageBoxImage.Question) == MessageBoxResult.Cancel)
			        {
				        childrenToDelete.Clear();
						return;
			        }
				}

			    RetrieveChildTextModulesFromParent(selectedTextModule);
	        }

			ViewModel.VMList.RemoveRange(childrenToDelete);
			childrenToDelete.Clear();
		}

		private readonly List<TextModuleVM> childrenToDelete = new List<TextModuleVM>();
	    private void RetrieveChildTextModulesFromParent(TextModuleVM parent)
	    {
		    var children = ViewModel.VMList.Where(w => w.Parent != null && w.Parent.Equals(parent));

		    foreach(var child in children)
		    {
			    childrenToDelete.Add(child);
				RetrieveChildTextModulesFromParent(child);
		    }
	    }

        private void ButtonAddTextModule_Click(object sender, RoutedEventArgs e)
        {
            if (ValidationTrigger.Validate(this))
            {
	            ViewModel.NewVM.IsOnlyForEmployee = !IsInAdministrationView;
                ViewModel.AddNewVMToList();
				Save(ReloadViewModel);
            }
        }

        public static bool CheckEditorRights(TextModuleVM textModuleVM, object parameter)
        {
	        if (textModuleVM != null)
	        {
                var isOwn = textModuleVM.Employee != null && textModuleVM.Employee.EmployeeOid.Equals(BeWoApp.LoggedOnEmployee.EmployeeOid);

		        var hasRight2EditAll = BeWoApp.LoggedOnUser.HasRight(UserRightType.TextbausteineAlleBearbeiten);
		        var hasRight2EditOwn = BeWoApp.LoggedOnUser.HasRight(UserRightType.TextbausteineNurEigeneBearbeiten);
		        var hasRight2Create4All = BeWoApp.LoggedOnUser.HasRight(UserRightType.TextbausteineAlleBearbeiten);

		        if(parameter != null && parameter.ToString().Equals("IsOnlyForEmployeeCheckBox"))
		        {
			        return isOwn && hasRight2EditOwn && hasRight2Create4All || hasRight2EditAll;
		        }

		        return isOwn && hasRight2EditOwn || hasRight2EditAll;
	        }

	        return false;
        }

	    private void SaveAsTextModuleCategory_OnChecked(object sender, RoutedEventArgs e)
	    {
		    ViewModel.NewVM.Text = string.Empty;
	    }

	    private void SaveButton_OnClick(object sender, RoutedEventArgs e)
	    {
		    Save(ReloadViewModel);
	    }
    }
    //CBEINKOMMENTIEREN
    //public class IsOnlyForEmployeeRightsConverter : IValueConverter
    //{
    //    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    //    {
    //        var textModule = (TextModuleVM) value;

    //        return textModule != null && TextModuleView.CheckEditorRights(textModule, parameter) && !textModule.IsParent;
    //    }

    //    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    //    {
    //        throw new NotImplementedException();
    //    }
    //}

	public class TextModuleEditConverter : IMultiValueConverter
	{
		public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
		{
			var fieldname = ((EditGridCellData) values[0]).Column.FieldName;
			var shuoldBeEditableDespiteBeingFromAParentElement = fieldname.Equals("Name") || fieldname.Equals("IsDeleteable");
			var textModule = (TextModuleVM) values[1];

			return TextModuleView.CheckEditorRights(textModule, parameter) && shuoldBeEditableDespiteBeingFromAParentElement;
		}

		public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
		{
			throw new NotImplementedException();
		}
	}
}