using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using Serilog;
using TINK.Model.Bikes.BikeInfoNS.BluetoothLock;
using TINK.Model.Connector;
using TINK.Model.Device;
using TINK.Model.User;
using TINK.MultilingualResources;
using TINK.Repository.Exception;
using TINK.Repository.Request;
using TINK.Services.BluetoothLock;
using TINK.Services.BluetoothLock.Exception;
using TINK.Services.Geolocation;
using TINK.View;
using Xamarin.Essentials;

namespace TINK.ViewModel.Bikes.Bike.BluetoothLock.RequestHandler
{
	public class ReservedUnknown : Base, 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 ReservedUnknown(
		   IBikeInfoMutable selectedBike,
		   Func<bool> isConnectedDelegate,
		   Func<bool, IConnector> connectorFactory,
		   IGeolocationService geolocation,
		   ILocksService lockService,
		   Func<IPollingUpdateTaskManager> viewUpdateManager,
		   ISmartDevice smartDevice,
		   IViewService viewService,
		   IBikesViewModel bikesViewModel,
		   IUser activeUser) : base(
			   selectedBike,
			   AppResources.ActionOpenAndBook, // BT button text "Schloss öffnen und Rad mieten."               
			   false, // Show button to enabled returning of bike.
			   isConnectedDelegate,
			   connectorFactory,
			   geolocation,
			   lockService,
			   viewUpdateManager,
			   smartDevice,
			   viewService,
			   bikesViewModel,
			   activeUser)
		{
			LockitButtonText = AppResources.ActionClose; // BT button text "Schließen"
			IsLockitButtonVisible = true; // Show button to enable opening lock in case user took a pause and does not want to return the bike.
		}

		/// <summary> Open bike and update COPRI lock state. </summary>
		public async Task<IRequestHandler> HandleRequestOption1() => await OpenLock();

		/// <summary> Open bike and update COPRI lock state. </summary>
		public async Task<IRequestHandler> OpenLock()
		{
			// Unlock bike.
			Log.ForContext<ReservedUnknown>().Information("User request to unlock bike {bike}.", SelectedBike);

			// Stop polling before returning bike.
			BikesViewModel.IsIdle = false;
			BikesViewModel.ActionText = AppResources.ActivityTextOneMomentPlease;
			await ViewUpdateManager().StopUpdatePeridically();

			BikesViewModel.ActionText = AppResources.ActivityTextOpeningLock;
			ILockService btLock;
			try
			{
				btLock = LockService[SelectedBike.LockInfo.Id];
				SelectedBike.LockInfo.State = (await btLock.OpenAsync())?.GetLockingState() ?? LockingState.UnknownDisconnected;
			}
			catch (Exception exception)
			{
				BikesViewModel.ActionText = string.Empty;

				if (exception is OutOfReachException)
				{
					Log.ForContext<ReservedUnknown>().Debug("Lock can not be opened. {Exception}", exception);

					await ViewService.DisplayAlert(
						AppResources.ErrorOpenLockTitle,
						AppResources.ErrorOpenLockOutOfReachMessage,
						AppResources.MessageAnswerOk);
				}
				else if (exception is CouldntOpenBoldIsBlockedException)
				{
					Log.ForContext<ReservedUnknown>().Debug("Lock can not be opened. bold is blocked. {Exception}", exception);

					await ViewService.DisplayAlert(
						AppResources.ErrorOpenLockTitle,
						AppResources.ErrorOpenLockBoldIsBlockedMessage,
						AppResources.MessageAnswerOk);
				}
				else if (exception is CouldntOpenBoldStatusIsUnknownException)
				{
					Log.ForContext<ReservedUnknown>().Debug("Lock can not be opened. lock reports state unkwnown. {Exception}", exception);

					await ViewService.DisplayAlert(
						AppResources.ErrorOpenLockStillClosedTitle,
						AppResources.ErrorOpenLockBoldStatusIsUnknownMessage,
						AppResources.MessageAnswerOk);
				}
				else if (exception is CouldntOpenInconsistentStateExecption inconsistentState
						&& inconsistentState.State == LockingState.Closed)
				{
					Log.ForContext<ReservedUnknown>().Debug("Lock can not be opened. lock reports state closed. {Exception}", exception);

					await ViewService.DisplayAlert(
						AppResources.ErrorOpenLockTitle,
						AppResources.ErrorOpenLockStillClosedMessage,
						AppResources.MessageAnswerOk);
				}
				else
				{
					Log.ForContext<ReservedUnknown>().Error("Lock can not be opened. {Exception}", exception);

					await ViewService.DisplayAlert(
						AppResources.ErrorOpenLockTitle,
						exception.Message,
						AppResources.MessageAnswerOk);
				}

				// When bold is blocked lock is still closed even if exception occurs.
				// In all other cases state is supposed to be unknown. Example: Lock is out of reach and no more bluetooth connected.
				SelectedBike.LockInfo.State = exception is StateAwareException stateAwareException
					? stateAwareException.State
					: LockingState.UnknownDisconnected;

				BikesViewModel.ActionText = AppResources.ActivityTextStartingUpdater;
				await ViewUpdateManager().StartUpdateAyncPeridically();
				BikesViewModel.ActionText = string.Empty;
				BikesViewModel.IsIdle = true;
				return RequestHandlerFactory.Create(SelectedBike, IsConnectedDelegate, ConnectorFactory, GeolocationService, LockService, ViewUpdateManager, SmartDevice, ViewService, BikesViewModel, ActiveUser);
			}

			BikesViewModel.ActionText = AppResources.ActivityTextReadingChargingLevel;
			try
			{
				SelectedBike.LockInfo.BatteryPercentage = await btLock.GetBatteryPercentageAsync();
			}
			catch (Exception exception)
			{
				if (exception is OutOfReachException)
				{
					Log.ForContext<ReservedUnknown>().Debug("Battery state can not be read, bike out of range. {Exception}", exception);

					BikesViewModel.ActionText = AppResources.ActivityTextErrorReadingChargingLevelOutOfReach;
				}
				else
				{
					Log.ForContext<ReservedUnknown>().Error("Battery state can not be read. {Exception}", exception);

					BikesViewModel.ActionText = AppResources.ActivityTextErrorReadingChargingLevelGeneral;
				}
			}

			// Lock list to avoid multiple taps while copri action is pending.
			BikesViewModel.ActionText = AppResources.ActivityTextStartingUpdatingLockingState;
			var versionTdo = btLock.VersionInfo;
			if (versionTdo != null)
			{
				SelectedBike.LockInfo.VersionInfo = new VersionInfo.Builder
				{
					FirmwareVersion = versionTdo.FirmwareVersion,
					HardwareVersion = versionTdo.HardwareVersion,
					LockVersion = versionTdo.LockVersion,
				}.Build();
			}
			IsConnected = IsConnectedDelegate();

			try
			{
				await ConnectorFactory(IsConnected).Command.UpdateLockingStateAsync(SelectedBike);
			}
			catch (Exception exception)
			{
				if (exception is WebConnectFailureException)
				{
					// Copri server is not reachable.
					Log.ForContext<ReservedUnknown>().Information("User locked bike {bike} in order to pause ride but updating failed (Copri server not reachable).", SelectedBike);

					BikesViewModel.ActionText = AppResources.ActivityTextErrorNoWebUpdateingLockstate;
				}
				else if (exception is ResponseException copriException)
				{
					// Copri server is not reachable.
					Log.ForContext<ReservedUnknown>().Information("User locked bike {bike} in order to pause ride but updating failed. {response}.", SelectedBike, copriException.Response);

					BikesViewModel.ActionText = AppResources.ActivityTextErrorStatusUpdateingLockstate;
				}
				else
				{
					Log.ForContext<ReservedUnknown>().Error("User locked bike {bike} in order to pause ride but updating failed . {@l_oException}", SelectedBike.Id, exception);
					BikesViewModel.ActionText = AppResources.ActivityTextErrorConnectionUpdateingLockstate;
				}
			}

			Log.ForContext<ReservedUnknown>().Information("User paused ride using {bike} successfully.", SelectedBike);
			BikesViewModel.ActionText = AppResources.ActivityTextStartingUpdater;
			await ViewUpdateManager().StartUpdateAyncPeridically();
			BikesViewModel.ActionText = string.Empty;
			BikesViewModel.IsIdle = true;
			return RequestHandlerFactory.Create(SelectedBike, IsConnectedDelegate, ConnectorFactory, GeolocationService, LockService, ViewUpdateManager, SmartDevice, ViewService, BikesViewModel, ActiveUser);
		}

		/// <summary> Close lock in order to pause ride and update COPRI lock state.</summary>
		public async Task<IRequestHandler> HandleRequestOption2() => await CloseLock();


		/// <summary> Close lock in order to pause ride and update COPRI lock state.</summary>
		public async Task<IRequestHandler> CloseLock()
		{
			// Unlock bike.
			BikesViewModel.IsIdle = false;

			Log.ForContext<ReservedUnknown>().Information("User request to lock bike {bike} in order to pause ride.", SelectedBike);

			// Start getting geolocation.
			BikesViewModel.ActionText = AppResources.ActivityTextQueryLocationStart;
			var ctsLocation = new CancellationTokenSource();
			Task<IGeolocation> currentLocationTask = null;
			var timeStamp = DateTime.Now;
			try
			{
				currentLocationTask = GeolocationService.GetAsync(ctsLocation.Token, timeStamp);
			}
			catch (Exception ex)
			{
				// No location information available.
				Log.ForContext<ReservedUnknown>().Information("Returning bike {Bike} is not possible. Start query location failed. {Exception}", SelectedBike, ex);

				BikesViewModel.ActionText = AppResources.ActivityTextErrorQueryLocationQuery;
			}

			// Stop polling before returning bike.
			BikesViewModel.ActionText = AppResources.ActivityTextOneMomentPlease;
			await ViewUpdateManager().StopUpdatePeridically();

			// Close lock
			BikesViewModel.ActionText = AppResources.ActivityTextClosingLock;
			try
			{
				SelectedBike.LockInfo.State = (await LockService[SelectedBike.LockInfo.Id].CloseAsync())?.GetLockingState() ?? LockingState.UnknownDisconnected;
			}
			catch (Exception exception)
			{
				BikesViewModel.ActionText = string.Empty;

				// Signal cts to  cancel getting geolocation.
				ctsLocation.Cancel();

				if (exception is OutOfReachException)
				{
					Log.ForContext<ReservedUnknown>().Debug("Lock can not be closed. {Exception}", exception);
					await ViewService.DisplayAlert(
						AppResources.ErrorCloseLockTitle,
						AppResources.ErrorCloseLockOutOfReachMessage,
						AppResources.MessageAnswerOk);
				}
				else if (exception is CouldntCloseMovingException)
				{
					Log.ForContext<ReservedUnknown>().Debug("Lock can not be closed. Lock is out of reach. {Exception}", exception);

					await ViewService.DisplayAlert(
						AppResources.ErrorCloseLockTitle,
						AppResources.ErrorCloseLockMovingMessage,
						AppResources.MessageAnswerOk);
				}
				else if (exception is CouldntCloseBoldBlockedException)
				{
					Log.ForContext<ReservedUnknown>().Debug("Lock can not be closed. Lock is out of reach. {Exception}", exception);

					await ViewService.DisplayAlert(
						AppResources.ErrorCloseLockTitle,
						AppResources.ErrorCloseLockBoldBlockedMessage,
						AppResources.MessageAnswerOk);
				}
				else
				{
					Log.ForContext<ReservedUnknown>().Error("Lock can not be closed. {Exception}", exception);
					await ViewService.DisplayAlert(
						AppResources.ErrorCloseLockTitle,
						exception.Message,
						AppResources.MessageAnswerOk);
				}

				SelectedBike.LockInfo.State = exception is StateAwareException stateAwareException
					? stateAwareException.State
					: LockingState.UnknownDisconnected;

				// Wait until cancel getting geolocation has completed.
				BikesViewModel.ActionText = AppResources.ActivityTextQueryLocationCancelWait;
				try
				{
					await Task.WhenAny(new List<Task> { currentLocationTask ?? Task.CompletedTask });
				}
				catch (Exception ex)
				{
					// No location information available.
					Log.ForContext<ReservedUnknown>().Information("Canceling query location failed on closing lock error. {Exception}", SelectedBike, ex);
				}

				BikesViewModel.ActionText = AppResources.ActivityTextStartingUpdater;
				await ViewUpdateManager().StartUpdateAyncPeridically();

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

			// Get geolocation.
			BikesViewModel.ActionText = AppResources.ActivityTextQueryLocation;
			IGeolocation currentLocation = null;
			try
			{
				await Task.WhenAny(new List<Task> { currentLocationTask ?? Task.CompletedTask });
				currentLocation = currentLocationTask?.Result ?? null;
			}
			catch (Exception ex)
			{
				// No location information available.
				Log.ForContext<ReservedUnknown>().Information("Returning bike {Bike} is not possible. {Exception}", SelectedBike, ex);

				BikesViewModel.ActionText = AppResources.ActivityTextErrorQueryLocationWhenAny;
			}

			// Lock list to avoid multiple taps while copri action is pending.
			BikesViewModel.ActionText = AppResources.ActivityTextStartingUpdatingLockingState;

			IsConnected = IsConnectedDelegate();

			try
			{
				await ConnectorFactory(IsConnected).Command.UpdateLockingStateAsync(
					SelectedBike,
					currentLocation != null
						? new LocationDto.Builder
						{
							Latitude = currentLocation.Latitude,
							Longitude = currentLocation.Longitude,
							Accuracy = currentLocation.Accuracy ?? double.NaN,
							Age = timeStamp.Subtract(currentLocation.Timestamp.DateTime),
						}.Build()
						: null);
			}
			catch (Exception exception)
			{
				if (exception is WebConnectFailureException)
				{
					// Copri server is not reachable.
					Log.ForContext<ReservedUnknown>().Information("User locked bike {bike} in order to pause ride but updating failed (Copri server not reachable).", SelectedBike);

					BikesViewModel.ActionText = AppResources.ActivityTextErrorNoWebUpdateingLockstate;
				}
				else if (exception is ResponseException copriException)
				{
					// Copri server is not reachable.
					Log.ForContext<ReservedUnknown>().Information("User locked bike {bike} in order to pause ride but updating failed. Message: {Message} Details: {Details}", SelectedBike, copriException.Message, copriException.Response);

					BikesViewModel.ActionText = AppResources.ActivityTextErrorStatusUpdateingLockstate;
				}
				else
				{
					Log.ForContext<ReservedUnknown>().Error("User locked bike {bike} in order to pause ride but updating failed. {@l_oException}", SelectedBike.Id, exception);

					BikesViewModel.ActionText = AppResources.ActivityTextErrorConnectionUpdateingLockstate;
				}
			}

			Log.ForContext<ReservedUnknown>().Information("User paused ride using {bike} successfully.", SelectedBike);
			BikesViewModel.ActionText = AppResources.ActivityTextStartingUpdater;
			await ViewUpdateManager().StartUpdateAyncPeridically();
			BikesViewModel.ActionText = string.Empty;
			BikesViewModel.IsIdle = true;
			return RequestHandlerFactory.Create(SelectedBike, IsConnectedDelegate, ConnectorFactory, GeolocationService, LockService, ViewUpdateManager, SmartDevice, ViewService, BikesViewModel, ActiveUser);
		}
	}
}