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

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

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

namespace TINK.ViewModel.Bikes.Bike.BC.RequestHandler
{
    public class Reserved : Base<BikeInfoMutable>, IRequestHandler
    {
        /// <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 Reserved(
           BikeInfoMutable selectedBike,
           Func<bool> isConnectedDelegate,
           Func<bool, IConnector> connectorFactory,
           Func<IPollingUpdateTaskManager> viewUpdateManager,
           ISmartDevice smartDevice,
           IViewService viewService,
           IBikesViewModel bikesViewModel,
           IUser activeUser) : base(selectedBike, AppResources.ActionCancelRequest, true, isConnectedDelegate, connectorFactory, viewUpdateManager, smartDevice, viewService, bikesViewModel, activeUser)
        {
        }

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

        /// <summary> Executes user request to cancel reservation. </summary>
        public async Task<IRequestHandler> HandleRequest()
        {
            // Lock list to avoid multiple taps while copri action is pending.
            BikesViewModel.ActionText = AppResources.ActivityTextOneMomentPlease;
            BikesViewModel.IsIdle = false;

            BikesViewModel.ActionText = string.Empty;
            var l_oResult = await ViewService.DisplayAlert(
                string.Empty,
                string.Format("Reservierung für Fahrrad {0} aufheben?", SelectedBike.GetFullDisplayName()),
                "Ja",
                "Nein");

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

            BikesViewModel.ActionText = AppResources.ActivityTextOneMomentPlease;

            // Stop polling before cancel request.
            await ViewUpdateManager().StopUpdatePeridically();

            try
            {
                IsConnected = IsConnectedDelegate();

                await ConnectorFactory(IsConnected).Command.DoCancelReservation(SelectedBike);

                // If canceling bike succedes remove bike because it is not ready to be booked again
                IsRemoveBikeRequired = true;
            }
            catch (Exception l_oException)
            {
                if (l_oException is InvalidAuthorizationResponseException)
                {
                    // Copri response is invalid.
                    Log.ForContext<Reserved>().Error("User selected reserved bike {l_oId} but canceling reservation failed (Invalid auth. response).", SelectedBike.Id);
                    BikesViewModel.ActionText = String.Empty;
                    await ViewService.DisplayAlert("Fehler beim Stornieren der Buchung!", l_oException.Message, "OK");
                    BikesViewModel.IsIdle = true;
                    return this;
                }
                else if (l_oException is WebConnectFailureException)
                {
                    // Copri server is not reachable.
                    Log.ForContext<Reserved>().Information("User selected reserved bike {l_oId} but cancel reservation failed (Copri server not reachable).", SelectedBike.Id);
                    BikesViewModel.ActionText = String.Empty;
                    await ViewService.DisplayAlert(
                        "Verbingungsfehler beim Stornieren der Buchung!",
                        string.Format("{0}\r\n{1}", l_oException.Message, WebConnectFailureException.GetHintToPossibleExceptionsReasons),
                        "OK");
                    BikesViewModel.IsIdle = true;
                    return this;
                }
                else
                {
                    Log.ForContext<Reserved>().Error("User selected reserved bike {l_oId} but cancel reservation failed. {@l_oException}.", SelectedBike.Id, l_oException);
                    BikesViewModel.ActionText = String.Empty;
                    await ViewService.DisplayAlert("Fehler beim Stornieren der Buchung!", l_oException.Message, "OK");
                    BikesViewModel.IsIdle = true;
                    return this;
                }
            }
            finally
            {
                // Restart polling again.
                await ViewUpdateManager().StartUpdateAyncPeridically();

                // 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.
            }

            Log.ForContext<Reserved>().Information("User canceled reservation of bike {l_oId} successfully.", SelectedBike.Id);

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