using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Data;

namespace Tango.SharedUI.Converters
{
    public class ObservableCollectionToViewSourceConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            String sortMember = parameter != null ? parameter.ToString() : null;
            IList list = value as IList;
            if (list != null)
            {
                var view = CollectionViewSource.GetDefaultView(list);
                view.SortDescriptions.Clear();

                //Delay because the DataGrid clears the sort description after source change.
                Task.Factory.StartNew(() =>
                {
                    Thread.Sleep(10);

                    Application.Current.Dispatcher.BeginInvoke(new Action(() =>
                    {
                        view.SortDescriptions.Add(new SortDescription(sortMember, ListSortDirection.Ascending));
                        view.Refresh();
                    }));
                });
                return view;
            }

            return value;
        }

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