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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.Core.Commands;
using Tango.DAL.Observables;
using Tango.MachineStudio.Common.Notifications;
using Tango.MachineStudio.DB.Managers;
using Tango.SharedUI;
using Tango.MachineStudio.DB.ExtensionMethods;
namespace Tango.MachineStudio.DB.ViewModels.DBViewModels
{
public abstract class DbTableViewModel<T> : ViewModel where T : IObservableEntity
{
private INotificationProvider _notification;
/// <summary>
/// Initializes a new instance of the <see cref="DbTableViewModel"/> class.
/// </summary>
public DbTableViewModel(INotificationProvider notification) : base()
{
_notification = notification;
Adapter = ObservablesEntitiesAdapter.Instance;
AddCommand = new RelayCommand(OnAdd);
EditCommand = new RelayCommand(OnEdit);
DeleteCommand = new RelayCommand(OnDelete);
DialogOKCommand = new RelayCommand(() => OnDialogOKPressed(DialogOpenMode, EditEntity));
DialogCancelCommand = new RelayCommand(() => OnDialogCancelPressed(DialogOpenMode, EditEntity));
IsDialogOpen = false;
}
private T _editEntity;
/// <summary>
/// Gets or sets the edit entity.
/// </summary>
public T EditEntity
{
get { return _editEntity; }
set { _editEntity = value; RaisePropertyChangedAuto(); }
}
private DialogOpenMode _dialogOpenMode;
/// <summary>
/// Gets or sets the dialog open mode.
/// </summary>
public DialogOpenMode DialogOpenMode
{
get { return _dialogOpenMode; }
set { _dialogOpenMode = value; RaisePropertyChangedAuto(); }
}
private bool _isDialogOpen;
/// <summary>
/// Gets or sets a value indicating whether this instance is dialog open.
/// </summary>
public bool IsDialogOpen
{
get { return _isDialogOpen; }
set { _isDialogOpen = value; RaisePropertyChangedAuto(); }
}
private ObservablesEntitiesAdapter _adapter;
/// <summary>
/// Gets or sets the DB adapter.
/// </summary>
public ObservablesEntitiesAdapter Adapter
{
get { return _adapter; }
set { _adapter = value; RaisePropertyChangedAuto(); }
}
private T _selectedEntity;
/// <summary>
/// Gets or sets the selected entity.
/// </summary>
public T SelectedEntity
{
get { return _selectedEntity; }
set { _selectedEntity = value; RaisePropertyChangedAuto(); }
}
private String _filter;
/// <summary>
/// Gets or sets the search filter.
/// </summary>
public String Filter
{
get { return _filter; }
set { _filter = value; RaisePropertyChangedAuto(); OnFilterChanged(value); }
}
/// <summary>
/// Gets or sets the dialog OK command.
/// </summary>
public RelayCommand DialogOKCommand { get; set; }
/// <summary>
/// Gets or sets the dialog cancel command.
/// </summary>
public RelayCommand DialogCancelCommand { get; set; }
/// <summary>
/// Gets or sets the add command.
/// </summary>
public RelayCommand AddCommand { get; set; }
/// <summary>
/// Gets or sets the edit command.
/// </summary>
public RelayCommand EditCommand { get; set; }
/// <summary>
/// Gets or sets the delete command.
/// </summary>
public RelayCommand DeleteCommand { get; set; }
/// <summary>
/// Called when delete command invoked.
/// </summary>
protected virtual void OnDelete()
{
SelectedEntity.Deleted = true;
SelectedEntity.Save();
}
/// <summary>
/// Called when edit command invoked.
/// </summary>
protected virtual void OnEdit()
{
DialogOpenMode = DialogOpenMode.Editing;
EditEntity = GetEditableEntity(DialogOpenMode);
_notification.ShowDialog(DialogOpenMode, this);
IsDialogOpen = true;
}
/// <summary>
/// Called when add command invoked.
/// </summary>
protected virtual void OnAdd()
{
DialogOpenMode = DialogOpenMode.Adding;
EditEntity = GetEditableEntity(DialogOpenMode);
_notification.ShowDialog(DialogOpenMode, this);
IsDialogOpen = true;
}
/// <summary>
/// Called when dialog closes with OK button.
/// </summary>
/// <param name="mode">The mode.</param>
protected virtual void OnDialogOKPressed(DialogOpenMode mode, T entity)
{
if (mode == DialogOpenMode.Editing)
{
entity.ShallowCopyTo(SelectedEntity);
entity = SelectedEntity;
}
OnBeforeEntitySave(mode, entity);
entity.Save();
IsDialogOpen = false;
SelectedEntity = EditEntity;
}
/// <summary>
/// Called when [before entity save].
/// </summary>
/// <param name="mode">The mode.</param>
/// <param name="entity">The entity.</param>
protected virtual void OnBeforeEntitySave(DialogOpenMode mode,T entity)
{
}
/// <summary>
/// Called when dialog closes with cancel button.
/// </summary>
/// <param name="mode">The mode.</param>
protected virtual void OnDialogCancelPressed(DialogOpenMode mode, T entity)
{
IsDialogOpen = false;
}
/// <summary>
/// Gets the editable entity.
/// </summary>
/// <param name="mode">The mode.</param>
/// <returns></returns>
private T GetEditableEntity(DialogOpenMode mode)
{
if (mode == DialogOpenMode.Adding)
{
var newEntity = Activator.CreateInstance<T>();
InitializeEntity(newEntity);
return newEntity;
}
else
{
return SelectedEntity.ShallowClone();
}
}
protected virtual void OnFilterChanged(String filter)
{
}
protected virtual void InitializeEntity(T entity)
{
}
}
}
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