sharee.bike-App/SharedBusinessLogic/ViewModel/Bikes/Bike/BC/RequestHandler/Disposable.cs

using System;
using System.Threading.Tasks;
using Serilog;
using ShareeBike.Model.Connector;
using ShareeBike.Model.Device;
using ShareeBike.Model.State;
using ShareeBike.Model.User;
using ShareeBike.MultilingualResources;
using ShareeBike.Repository.Exception;
using ShareeBike.Services.CopriApi.Exception;
using ShareeBike.View;
using BikeInfoMutable = ShareeBike.Model.Bikes.BikeInfoNS.BC.BikeInfoMutable;

namespace ShareeBike.ViewModel.Bikes.Bike.BC.RequestHandler
{
	/// <param name="smartDevice">Provides info about the smart device (phone, tablet, ...)</param>
	/// <param name="bikesViewModel">View model to be used for progress report and unlocking/ locking view.</param>
	public class Disposable : Base<BikeInfoMutable>, IRequestHandler
	{
		public Disposable(
			BikeInfoMutable selectedBike,
			Func<bool> isConnectedDelegate,
			Func<bool, IConnector> connectorFactory,
			Func<IPollingUpdateTaskManager> viewUpdateManager,
			ISmartDevice smartDevice,
			IViewService viewService,
			IBikesViewModel bikesViewModel,
			IUser activeUser) : base(selectedBike, selectedBike.State.Value.GetActionText(), true, isConnectedDelegate, connectorFactory, viewUpdateManager, smartDevice, viewService, bikesViewModel, activeUser)
		{
		}
		/// <summary> Request bike. </summary>
		public async Task<IRequestHandler> HandleRequest()
		{
			// Lock list to avoid multiple taps while copri action is pending.
			BikesViewModel.ActionText = AppResources.ActivityTextOneMomentPlease;
			BikesViewModel.IsIdle = false;

			var l_oResult = await ViewService.DisplayAlert(
			string.Empty,
			string.Format(
				AppResources.QuestionReserveBike,
				SelectedBike.GetFullDisplayName(),
				SelectedBike.TariffDescription?.MaxReservationTimeSpan.TotalMinutes ?? 0),
			AppResources.MessageAnswerYes,
			AppResources.MessageAnswerNo);

			if (l_oResult == false)
			{
				// User aborted booking process
				Log.ForContext<Disposable>().Information("User selected centered bike {l_oId} in order to reserve but action was canceled.", SelectedBike.Id);
				BikesViewModel.IsIdle = true;
				return this;
			}

			BikesViewModel.ActionText = AppResources.ActivityTextOneMomentPlease;

			// Stop polling before requesting bike.
			await ViewUpdateManager().StopAsync();

			IsConnected = IsConnectedDelegate();

			try
			{
				await ConnectorFactory(IsConnected).Command.DoReserve(SelectedBike);
			}
			catch (Exception exception)
			{
				if (exception is BookingDeclinedException)
				{
					// Too many bikes booked.
					Log.ForContext<Disposable>().Information("Request declined because maximum count of bikes {l_oException.MaxBikesCount} already requested/ booked.", (exception as BookingDeclinedException).MaxBikesCount);

					BikesViewModel.ActionText = string.Empty;
					await ViewService.DisplayAlert(
						AppResources.MessageHintTitle,
						string.Format(AppResources.ErrorReservingBikeTooManyReservationsRentals, SelectedBike.Id, (exception as BookingDeclinedException).MaxBikesCount),
						AppResources.MessageAnswerOk);
				}
				else if (exception is WebConnectFailureException
					|| exception is RequestNotCachableException)
				{
					// Copri server is not reachable.
					Log.ForContext<Disposable>().Information("User selected centered bike {l_oId} but reserving failed (Copri server not reachable).", SelectedBike.Id);

					BikesViewModel.ActionText = string.Empty;
					await ViewService.DisplayAlert(
						AppResources.ErrorNoConnectionTitle,
						AppResources.ErrorNoWeb,
						AppResources.MessageAnswerOk);
				}
				else
				{
					Log.ForContext<Disposable>().Error("User selected centered bike {l_oId} but reserving failed. {@l_oException}", SelectedBike.Id, exception);

					BikesViewModel.ActionText = string.Empty;
					await ViewService.DisplayAlert(AppResources.ErrorReservingBikeTitle, exception.Message, AppResources.MessageAnswerOk);
				}

				BikesViewModel.ActionText = string.Empty; // Todo: Remove this statement because in catch block ActionText is already set to empty above.
				BikesViewModel.IsIdle = true;
				return this;
			}

			finally
			{
				// Restart polling again.
				await ViewUpdateManager().StartAsync();

				// Update status text and unlock list of bikes because no more action is pending.
				BikesViewModel.ActionText = string.Empty; // Todo: Move this statement in front of finally block because in catch block ActionText is already set to empty.
				BikesViewModel.IsIdle = true;
			}

			Log.ForContext<Disposable>().Information("User reserved bike {l_oId} successfully.", SelectedBike.Id);

			return RequestHandlerFactory.Create(SelectedBike, IsConnectedDelegate, ConnectorFactory, ViewUpdateManager, SmartDevice, ViewService, BikesViewModel, ActiveUser);
		}
	}
}