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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Linq.Expressions;
using System.Windows.Input;
using MVPtoMVVM.domain;
using MVPtoMVVM.repositories;
namespace MVPtoMVVM.mvvm.viewmodels
{
public class MainWindowViewModel : INotifyPropertyChanged
{
private ITodoItemRepository todoItemRepository;
private Synchronizer<MainWindowViewModel> updater;
public event PropertyChangedEventHandler PropertyChanged = (o, e) => { };
public ICollection<TodoItemViewModel> TodoItems { get; set; }
public ICommand CancelChangesCommand { get; set; }
public ICommand AddNewItemCommand { get; set; }
public MainWindowViewModel(ITodoItemRepository todoItemRepository)
{
this.todoItemRepository = todoItemRepository;
AddNewItemCommand = new SimpleCommand(AddNewItem);
CancelChangesCommand = new SimpleCommand(RefreshChanges);
updater = new Synchronizer<MainWindowViewModel>(() => PropertyChanged);
TodoItems = new ObservableCollection<TodoItemViewModel>();
RefreshChanges();
}
private void RefreshChanges()
{
TodoItems.Clear();
foreach (var item in todoItemRepository.GetAll().Select(MapFrom))
{
TodoItems.Add(item);
}
}
private void AddNewItem()
{
TodoItems.Add(new TodoItemViewModel(todoItemRepository){Parent = this, DueDate = DateTime.Today, Description = string.Empty, IsDirty = false});
}
private TodoItemViewModel MapFrom(TodoItem item)
{
return new TodoItemViewModel(todoItemRepository)
{
Id = item.Id,
Description = item.Description,
DueDate = item.DueDate,
Parent = this,
IsDirty = false,
};
}
public void Update(Expression<Func<MainWindowViewModel, object>> property)
{
updater.Update(this, property);
}
}
}
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