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

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> 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 succeeds remove bike because it is not ready to be booked again
				IsRemoveBikeRequired = true;
			}
			catch (Exception exception)
			{
				if (exception 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!", exception.Message, "OK");
					BikesViewModel.IsIdle = true;
					return this;
				}
				else if (exception is WebConnectFailureException
					|| exception is RequestNotCachableException)
				{
					// 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}", exception.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, exception);
					BikesViewModel.ActionText = String.Empty;
					await ViewService.DisplayAlert("Fehler beim Stornieren der Buchung!", exception.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);
		}
	}
}