using System;
using System.Windows;
using System.Windows.Input;
using MvvmFoundation.Wpf;

namespace MVVM_Test.ViewModel
{
    public class ViewModel : ObservableObject
    {
        private DateTime selectedDate;
        public DateTime SelectedDate
        {
            get
            {
                return selectedDate;
            }
            set
            {
                selectedDate = value;
                RaisePropertyChanged("SelectedDate");
            }
        }

        public ViewModel()
        {
            SelectedDate = DateTime.Now;
        }

        public ICommand PrevHistory_cmd
        {
            get { return new RelayCommand(PrevHistoryExecute, PrevHistoryCanExecute); }
        }

        private void PrevHistoryExecute()
        {
            SelectedDate = SelectedDate - new TimeSpan(1, 0, 0, 0);
        }

        private bool PrevHistoryCanExecute()
        {
            return true;
        }

        public ICommand NextHistory_cmd
        {
            get { return new RelayCommand(NextHistoryExecute, NextHistoryCanExecute); }
        }

        private void NextHistoryExecute()
        {
            SelectedDate = SelectedDate + new TimeSpan(1, 0, 0, 0);
        }

        private bool NextHistoryCanExecute()
        {
            return true;
        }
    }
}