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

using Serilog;
using System;
using System.Threading.Tasks;
using TINK.Model.Connector;
using TINK.Model.Repository.Exception;
using TINK.Model.State;
using TINK.Model.User;
using TINK.MultilingualResources;
using TINK.View;

using BikeInfoMutable = TINK.Model.Bike.BC.BikeInfoMutable;

namespace TINK.ViewModel.Bikes.Bike.BC.RequestHandler
{
    /// <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,
            IViewService viewService,
            IBikesViewModel bikesViewModel,
            IUser activeUser) : base(selectedBike, selectedBike.State.Value.GetActionText(), true, isConnectedDelegate, connectorFactory, viewUpdateManager, viewService, bikesViewModel, activeUser)
        {
        }

        /// <summary> Gets the bike state. </summary>
        public override InUseStateEnum State => InUseStateEnum.Disposable;

        /// <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.GetDisplayName(), StateRequestedInfo.MaximumReserveTime.Minutes),
            AppResources.MessageAnswerYes,
            AppResources.MessageAnswerNo);

            if (l_oResult == false)
            {
                // User aborted booking process
                Log.ForContext<Disposable>().Information("User selected availalbe 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().StopUpdatePeridically();

            IsConnected = IsConnectedDelegate();

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

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

                    BikesViewModel.ActionText = string.Empty;
                    await ViewService.DisplayAlert(
                        "Verbingungsfehler beim Reservieren des Rads!",
                        string.Format("{0}\r\n{1}", l_oException.Message, WebConnectFailureException.GetHintToPossibleExceptionsReasons),
                        "OK");
                }
                else
                {
                    Log.ForContext<Disposable>().Error("User selected availalbe bike {l_oId} but reserving failed. {@l_oException}", SelectedBike.Id, l_oException);

                    BikesViewModel.ActionText = string.Empty;
                    await ViewService.DisplayAlert("Fehler beim Reservieren des Rads!", l_oException.Message, "OK");
                }

                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().StartUpdateAyncPeridically();

                // 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, ViewService, BikesViewModel, ActiveUser);
        }
    }
}