sharee.bike-App/TINKLib/ViewModel/Bikes/Bike/BC/RequestHandler/NotLoggedIn.cs

using System;
using System.Threading.Tasks;
using Serilog;
using TINK.Model.State;
using TINK.Model.User;
using TINK.View;

namespace TINK.ViewModel.Bikes.Bike.BC.RequestHandler
{
	public class NotLoggedIn : IRequestHandler
	{
		/// <param name="bikesViewModel">View model to be used for progress report and unlocking/ locking view.</param>
		public NotLoggedIn(
			 InUseStateEnum state,
			 IViewService viewService,
			 IBikesViewModel bikesViewModel,
			 IUser activeUser)
		{
			ButtonText = state.GetActionText();
			IsIdle = true;
			ViewService = viewService;
			BikesViewModel = bikesViewModel
				?? throw new ArgumentException($"Can not construct {GetType().Name}-object. {nameof(bikesViewModel)} must not be null.");
		}

		public bool IsButtonVisible => true;

		public bool IsIdle { get; private set; }

		public string ButtonText { get; private set; }

		public string ActionText { get => BikesViewModel.ActionText; private set => BikesViewModel.ActionText = value; }

		/// <summary>
		/// Reference on view service to show modal notifications and to perform navigation.
		/// </summary>
		protected IViewService ViewService { get; }

		/// <summary>View model to be used for progress report and unlocking/ locking view.</summary>
		public IBikesViewModel BikesViewModel { get; }

		public bool IsConnected => throw new NotImplementedException();

		/// <summary> Gets if the bike has to be removed after action has been completed. </summary>
		public bool IsRemoveBikeRequired => false;

		public async Task<IRequestHandler> HandleRequest()
		{
			Log.ForContext<NotLoggedIn>().Information("User selected bike but is not logged in.");

			// User is not logged in
			ActionText = string.Empty;
			var l_oResult = await ViewService.DisplayAlert(
				"Hinweis",
				"Bitte anmelden vor Reservierung eines Fahrrads!\r\nAuf Anmeldeseite wechseln?",
				"Ja",
				"Nein");

			if (l_oResult == false)
			{
				// User aborted booking process
				IsIdle = true;
				return this;
			}

			try
			{
				// Switch to login page
				await ViewService.ShowPage("//LoginPage");

			}
			catch (Exception p_oException)
			{
				Log.ForContext<BikesViewModel>().Error("Ein unerwarteter Fehler ist in der Klasse NotLoggedIn aufgetreten. Kontext: Aufruf nach Reservierungsversuch ohne Anmeldung. {@Exception}", p_oException);
				IsIdle = true;
				return this;
			}

			IsIdle = true;
			return this;
		}
	}
}