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

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

namespace TINK.ViewModel.Bikes.Bike.BluetoothLock
{
    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)
        {
            State = state;
            ViewService = viewService;
            BikesViewModel = bikesViewModel
                                ?? throw new ArgumentException($"Can not construct {GetType().Name}-object. {nameof(bikesViewModel)} must not be null.");
        }

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

        public InUseStateEnum State { get; }

        public bool IsButtonVisible => true;

        public bool IsLockitButtonVisible => false;

        public string ButtonText => BC.StateToText.GetActionText(State);

        public string LockitButtonText => GetType().Name;

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

        public bool IsConnected => throw new NotImplementedException();

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

        public async Task<IRequestHandler> HandleRequestOption1()
        {
            Log.ForContext<BikesViewModel>().Information("User selected bike but is not logged in.");

            // User is not logged in
            BikesViewModel.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
                BikesViewModel.IsIdle = true;
                return this;
            }

            try
            {
                // Switch to map page
#if USEMASTERDETAIL || USEFLYOUT
                ViewService.ShowPage(ViewTypes.LoginPage);
#else
                await ViewService.ShowPage("//LoginPage");
#endif
            }
            catch (Exception p_oException)
            {
                Log.ForContext<BikesViewModel>().Error("Ein unerwarteter Fehler ist auf der Seite Anmelden aufgetreten. Kontext: Aufruf nach Reservierungsversuch ohne Anmeldung. {@Exception}", p_oException);
                BikesViewModel.IsIdle = true;
                return this;
            }

            BikesViewModel.IsIdle = true;
            return this;
        }

        public async Task<IRequestHandler> HandleRequestOption2()
        {
            Log.ForContext<NotLoggedIn>().Error("Click of unsupported button detected.");
            return await Task.FromResult(this);
        }

        public string ErrorText => string.Empty;
    }
}