using DevExpress.Mvvm;
using DevExpress.Mvvm.POCO;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;

namespace BeWo.ViewModel.View
{
	public abstract class AcceptCancelDialogViewModel : DialogViewModel
	{
		public DelegateCommand SaveCommand { get; set; }

		protected AcceptCancelDialogViewModel() : base()
		{
			SaveCommand = new DelegateCommand(Save, canSave, false);
		}

		protected virtual void Save()
		{
			throw new NotImplementedException();
		}

		protected virtual bool canSave()
		{
			return false;
		}
	}

	public class AcceptCancelDialogViewModel<DCType, VMType> : AcceptCancelDialogViewModel where VMType : AbstractDCMapperVM<DCType> where DCType : new()
	{
		public event EventHandler<DCType> DataSaved;

		public VMType ViewModel { get; set; }

		public string AcceptButtonText => ViewModel.IsNew ? "Hinzufügen" : "Speichern";

		public AcceptCancelDialogViewModel(VMType viewModel) : base()
		{
			ViewModel = viewModel;

			ViewModel.PropertyChanged += (s, e) =>
			{
				SaveCommand.RaiseCanExecuteChanged();
			};
		}

		protected void DataSave(DCType dCType)
		{
			DataSaved?.Invoke(this, dCType);

			Close();
		}

		protected override void Close()
		{
			base.Close();
		}

		protected override bool canSave()
		{
			return ViewModel.IsNew || ViewModel.IsDirty;
		}

		protected virtual bool isDirty()
		{
			return false;
		}
	}
}