Retail_manager/RMWPFUserInterface/ViewModels/ShellViewModel.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Caliburn.Micro;
using RMWPFInterfaceLibrary.Api;
using RMWPFInterfaceLibrary.Models;
using RMWPFUserInterface.EventModels;

namespace RMWPFUserInterface.ViewModels
{
    public class ShellViewModel : Conductor<Object>, IHandle<LogOnEvent>
    {
        private IEventAggregator _events;
        private SalesViewModel _salesVM;
        private ILoggedInUserModel _user;
        private IAPIHelper _apiHelper;
        public ShellViewModel(IEventAggregator events, SalesViewModel salesVM,
            SimpleContainer container, ILoggedInUserModel user, IAPIHelper apiHelper)
        {
            _salesVM = salesVM;
            _events = events;
            _user = user;
            _apiHelper = apiHelper;
                    

            _events.SubscribeOnUIThread(this);
         
            ActivateItemAsync(IoC.Get<LoginViewModel>());
        }
        public bool IsLoggedIn
        { 
            get 
            {
                bool output = false;

                if (string.IsNullOrWhiteSpace(_user.Token) == false)
                {
                    output = true;
                }

                return output;
            } 
        }

        public void ExitApplication()
        {
            TryCloseAsync();
        }

        public void LogOut()
        {
            _user.ResetUserModel();
            _apiHelper.LogOffUser();

            NotifyOfPropertyChange(() => IsLoggedIn);
            ActivateItemAsync(IoC.Get<LoginViewModel>());

        }
        public Task HandleAsync(LogOnEvent message, CancellationToken cancellationToken)
        {
            ActivateItemAsync(_salesVM);
            NotifyOfPropertyChange(() => IsLoggedIn);
            return Task.CompletedTask;
        }
    }
}