using System;
using System.Threading.Tasks;
using NSubstitute;
using NUnit.Framework;
using ShareeBike.Model.Bikes.BikeInfoNS.CopriLock;
using ShareeBike.Model.Connector;
using ShareeBike.Model.Device;
using ShareeBike.Model.User;
using ShareeBike.Repository.Exception;
using ShareeBike.View;
using ShareeBike.ViewModel;
using ShareeBike.ViewModel.Bikes;
using ShareeBike.ViewModel.Bikes.Bike.CopriLock.RequestHandler;

namespace SharedBusinessLogic.Tests.ViewModel.Bikes.Bike.CopriLock.RequestHandler
{
	public class TestDisposableClosed
	{
		/// <summary>
		/// Use case: Start booking and cancel.
		/// Final state: Same as initial state.
		/// </summary>
		[Test]
		public void TestBookAndReleaseCancel()
		{
			var bike = Substitute.For<IBikeInfoMutable>();
			var connector = Substitute.For<IConnector>();
			var command = Substitute.For<ICommand>();
			var pollingManager = Substitute.For<IPollingUpdateTaskManager>();
			var viewService = Substitute.For<IViewService>();
			var bikesViewModel = Substitute.For<IBikesViewModel>();
			var activeUser = Substitute.For<IUser>();

			var handler = new DisposableClosed(
				bike,
				() => true, // isConnectedDelegate
				(isConnected) => connector,
				() => pollingManager,
				Substitute.For<ISmartDevice>(),
				viewService,
				bikesViewModel,
				activeUser);

			bike.Id.Returns("0");

			viewService.DisplayAlert(
				string.Empty,
				"Rent bike Nr. 0 and open lock?",
				"Yes",
				"No").Returns(Task.FromResult(false)); // User chooes "No"

			var subsequent = handler.HandleRequestOption1().Result;

			// Verify behavior
			Received.InOrder(() =>
			{
				bikesViewModel.Received(1).IsIdle = false; // GUI must be locked
				viewService.DisplayAlert(
					string.Empty,
					"Rent bike Nr. 0 and open lock?",
					"Yes",
					"No");
				bikesViewModel.Received(1).IsIdle = true; // GUI must be unlocked
			});

			// Verify state after action
			Assert.That(
				subsequent.ButtonText,
				Is.EqualTo("Start rental & Open lock"));
			Assert.That(
				subsequent.IsButtonVisible,
				Is.True);
			Assert.That(
				subsequent.LockitButtonText,
				Is.EqualTo("Reserve / Rent"));
			Assert.That(
				subsequent.IsLockitButtonVisible,
				Is.True);
		}

		/// <summary>
		/// Use case: Try book bike and release from station.
		/// Final state: Bike is disposable.
		/// </summary>
		[Test]
		public void TestBookAndReleaseBookAndOpenAyncFailsWebConnectFailureException()
		{
			var bike = Substitute.For<IBikeInfoMutable>();
			var connector = Substitute.For<IConnector>();
			var command = Substitute.For<ICommand>();
			var pollingManager = Substitute.For<IPollingUpdateTaskManager>();
			var viewService = Substitute.For<IViewService>();
			var bikesViewModel = Substitute.For<IBikesViewModel>();
			var activeUser = Substitute.For<IUser>();

			var handler = new DisposableClosed(
				bike,
				() => true, // isConnectedDelegate
				(isConnected) => connector,
				() => pollingManager,
				Substitute.For<ISmartDevice>(),
				viewService,
				bikesViewModel,
				activeUser);

			bike.Id.Returns("0");

			viewService.DisplayAlert(
				string.Empty,
				string.Format("Rent bike {0} and open lock?", "Nr. 0"),
				"Yes",
				"No").Returns(Task.FromResult(true));

			bike.LockInfo.State.Returns(LockingState.Closed); // Locking state does not change.

			connector.Command.BookAndOpenAync(bike).Returns(x => throw new WebConnectFailureException("Context info", new Exception("Tst")));

			bike.State.Value.Returns(ShareeBike.Model.State.InUseStateEnum.Disposable); // State remains available because booking request failed.

			var subsequent = handler.HandleRequestOption1().Result;

			// Verify behavior
			Received.InOrder(() =>
			{
				bikesViewModel.Received(1).IsIdle = false; // GUI must be locked
				bikesViewModel.ActionText = "One moment please...";
				pollingManager.StopAsync(); // Polling must be stopped before any COPR and lock service action
				bikesViewModel.ActionText = "Renting bike...";
				connector.Command.BookAndOpenAync(bike); // Booking must be performed
				bikesViewModel.ActionText = string.Empty;
				viewService.DisplayAlert(
					"Connection to booking system not possible.",
					"A stable Internet connection is required. Connect to WIFI or to mobile network and activate mobile data. Try again.",
					"OK");
				bikesViewModel.ActionText = "Updating...";
				pollingManager.StartAsync(); // polling must be restarted again
				bikesViewModel.ActionText = string.Empty;
				bikesViewModel.Received(1).IsIdle = true; // GUI must be unlocked
			});

			// Verify state after action
			Assert.That(
				subsequent.ButtonText,
				Is.EqualTo("Start rental & Open lock"));
			Assert.That(
				subsequent.IsButtonVisible,
				Is.True);
			Assert.That(
				subsequent.LockitButtonText,
				Is.EqualTo("Reserve / Rent"));
			Assert.That(
				subsequent.IsLockitButtonVisible,
				Is.True);
		}

		/// <summary>
		/// Use case: Try book bike and release from station.
		/// Final state: Bike is disposable.
		/// </summary>
		[Test]
		public void TestBookAndReleaseBookAndOpenAyncFailsException()
		{
			var bike = Substitute.For<IBikeInfoMutable>();
			var connector = Substitute.For<IConnector>();
			var command = Substitute.For<ICommand>();
			var pollingManager = Substitute.For<IPollingUpdateTaskManager>();
			var viewService = Substitute.For<IViewService>();
			var bikesViewModel = Substitute.For<IBikesViewModel>();
			var activeUser = Substitute.For<IUser>();

			var handler = new DisposableClosed(
				bike,
				() => true, // isConnectedDelegate
				(isConnected) => connector,
				() => pollingManager,
				Substitute.For<ISmartDevice>(),
				viewService,
				bikesViewModel,
				activeUser);

			bike.Id.Returns("0");

			viewService.DisplayAlert(
				string.Empty,
				string.Format("Rent bike {0} and open lock?", "Nr. 0"),
				"Yes",
				"No").Returns(Task.FromResult(true));

			bike.LockInfo.State.Returns(LockingState.Closed); // Locking state does not change.

			connector.Command.BookAndOpenAync(bike).Returns(x => throw new Exception("Some error", new Exception("Inner exception")));

			bike.State.Value.Returns(ShareeBike.Model.State.InUseStateEnum.Disposable); // State remains available because booking request failed.

			var subsequent = handler.HandleRequestOption1().Result;

			// Verify behavior
			Received.InOrder(() =>
			{
				bikesViewModel.Received(1).IsIdle = false; // GUI must be locked
				bikesViewModel.ActionText = "One moment please...";
				pollingManager.StopAsync(); // Polling must be stopped before any COPR and lock service action
				bikesViewModel.ActionText = "Renting bike...";
				connector.Command.BookAndOpenAync(bike); // Booking must be performed
				bikesViewModel.ActionText = string.Empty;
				viewService.DisplayAlert(
					"Bike could not be rented!",
					"Some error",
					"OK");
				bikesViewModel.ActionText = "Updating...";
				pollingManager.StartAsync(); // polling must be restarted again
				bikesViewModel.ActionText = string.Empty;
				bikesViewModel.Received(1).IsIdle = true; // GUI must be unlocked
			});

			// Verify state after action
			Assert.That(
				subsequent.ButtonText,
				Is.EqualTo("Start rental & Open lock"));
			Assert.That(
				subsequent.IsButtonVisible,
				Is.True);
			Assert.That(
				subsequent.LockitButtonText,
				Is.EqualTo("Reserve / Rent"));
			Assert.That(
				subsequent.IsLockitButtonVisible,
				Is.True);
		}

		/// <summary>
		/// Use case: Book bike and release from station.
		/// Final state: Bike is booked and released from station.
		/// </summary>
		[Test]
		public void TestBookAndRelease()
		{
			var bike = Substitute.For<IBikeInfoMutable>();
			var connector = Substitute.For<IConnector>();
			var command = Substitute.For<ICommand>();
			var pollingManager = Substitute.For<IPollingUpdateTaskManager>();
			var viewService = Substitute.For<IViewService>();
			var bikesViewModel = Substitute.For<IBikesViewModel>();
			var activeUser = Substitute.For<IUser>();

			var handler = new DisposableClosed(
				bike,
				() => true, // isConnectedDelegate
				(isConnected) => connector,
				() => pollingManager,
				Substitute.For<ISmartDevice>(),
				viewService,
				bikesViewModel,
				activeUser);

			bike.Id.Returns("0");

			viewService.DisplayAlert(
				string.Empty,
				string.Format("Rent bike {0} and open lock?", "Nr. 0"),
				"Yes",
				"No").Returns(Task.FromResult(true));

			bike.LockInfo.State.Returns(LockingState.Open); // After Booking and opening, lock state is open.

			bike.State.Value.Returns(ShareeBike.Model.State.InUseStateEnum.Booked); // After Booking and opening, state is booked.

			var subsequent = handler.HandleRequestOption1().Result;

			// Verify behavior
			Received.InOrder(() =>
			{
				bikesViewModel.Received(1).IsIdle = false; // GUI must be locked
				bikesViewModel.ActionText = "One moment please...";
				pollingManager.StopAsync(); // Polling must be stopped before any COPR and lock service action
				bikesViewModel.ActionText = "Renting bike...";
				connector.Command.BookAndOpenAync(bike); // Booking must be performed
				bikesViewModel.ActionText = "Updating...";
				pollingManager.StartAsync(); // polling must be restarted again
				bikesViewModel.ActionText = string.Empty;
				bikesViewModel.Received(1).IsIdle = true; // GUI must be unlocked
			});

			// Verify state 
			Assert.That(
				subsequent.ButtonText,
				Is.EqualTo("BookedOpen"));
			Assert.That(
				subsequent.IsButtonVisible,
				Is.False);
			Assert.That(
				subsequent.LockitButtonText,
				Is.EqualTo("Open lock"));
			Assert.That(
				subsequent.IsLockitButtonVisible,
				Is.True);
		}

		/// <summary>
		/// Use case: Cancel reserving.
		/// Final state: Same as initial state.
		/// </summary>
		[Test]
		public void TestReserveCancel()
		{
			var bike = Substitute.For<IBikeInfoMutable>();
			var connector = Substitute.For<IConnector>();
			var command = Substitute.For<ICommand>();
			var pollingManager = Substitute.For<IPollingUpdateTaskManager>();
			var viewService = Substitute.For<IViewService>();
			var bikesViewModel = Substitute.For<IBikesViewModel>();
			var activeUser = Substitute.For<IUser>();

			bike.TariffDescription.MaxReservationTimeSpan.Returns(TimeSpan.FromMinutes(15));

			var handler = new DisposableClosed(
				bike,
				() => true, // isConnectedDelegate
				(isConnected) => connector,
				() => pollingManager,
				Substitute.For<ISmartDevice>(),
				viewService,
				bikesViewModel,
				activeUser);

			bike.Id.Returns("0");

			viewService.DisplayAlert(
				string.Empty,
				"Reserve bike Nr. 0 free of charge for 15 min?",
				"Yes",
				"No").Returns(Task.FromResult(false)); // User chooes "No"

			var subsequent = handler.HandleRequestOption2().Result;

			// Verify behavior
			Received.InOrder(() =>
			{
				bikesViewModel.Received(1).IsIdle = false; // GUI must be locked
				viewService.DisplayAlert(
					string.Empty,
					"Reserve bike Nr. 0 free of charge for 15 min?",
					"Yes",
					"No");
				bikesViewModel.Received(1).IsIdle = true; // GUI must be unlocked
			});

			// Verify state after action
			Assert.That(
				subsequent.ButtonText,
				Is.EqualTo("Start rental & Open lock"));
			Assert.That(
				subsequent.IsButtonVisible,
				Is.True);
			Assert.That(
				subsequent.LockitButtonText,
				Is.EqualTo("Reserve / Rent"));
			Assert.That(
				subsequent.IsLockitButtonVisible,
				Is.True);
		}

		/// <summary>
		/// Use case: Try book reserve bike.
		/// Final state: Bike is disposable.
		/// </summary>
		[Test]
		public void TestReserveDoReserveFailsBookingDeclinedException()
		{
			var bike = Substitute.For<IBikeInfoMutable>();
			var connector = Substitute.For<IConnector>();
			var command = Substitute.For<ICommand>();
			var pollingManager = Substitute.For<IPollingUpdateTaskManager>();
			var viewService = Substitute.For<IViewService>();
			var bikesViewModel = Substitute.For<IBikesViewModel>();
			var activeUser = Substitute.For<IUser>();

			bike.TariffDescription.MaxReservationTimeSpan.Returns(TimeSpan.FromMinutes(15));

			var handler = new DisposableClosed(
				bike,
				() => true, // isConnectedDelegate
				(isConnected) => connector,
				() => pollingManager,
				Substitute.For<ISmartDevice>(),
				viewService,
				bikesViewModel,
				activeUser);

			bike.Id.Returns("0");

			viewService.DisplayAlert(
				string.Empty,
				"Reserve bike Nr. 0 free of charge for 15 min?",
				"Yes",
				"No").Returns(Task.FromResult(true));

			bike.LockInfo.State.Returns(LockingState.Closed); // Locking state does not change.

			connector.Command.DoReserve(bike).Returns(x => throw new BookingDeclinedException(4));

			bike.State.Value.Returns(ShareeBike.Model.State.InUseStateEnum.Disposable); // State remains available because booking request failed.

			var subsequent = handler.HandleRequestOption2().Result;

			// Verify behavior
			Received.InOrder(() =>
			{
				bikesViewModel.Received(1).IsIdle = false; // GUI must be locked
				bikesViewModel.ActionText = "One moment please...";
				pollingManager.StopAsync(); // Polling must be stopped before any COPR and lock service action
				bikesViewModel.ActionText = "Reserving bike...";
				connector.Command.DoReserve(bike); // Booking must be performed
				bikesViewModel.ActionText = string.Empty;
				viewService.DisplayAlert(
					"Hint",
					"A reservation of bike Nr. 0 was rejected because the maximum allowed number of 4 reservations/rentals had already been made.",
					"OK");
				bikesViewModel.ActionText = "Updating...";
				pollingManager.StartAsync(); // polling must be restarted again
				bikesViewModel.ActionText = string.Empty;
				bikesViewModel.Received(1).IsIdle = true; // GUI must be unlocked
			});

			// Verify state after action
			Assert.That(
				subsequent.ButtonText,
				Is.EqualTo("Start rental & Open lock"));
			Assert.That(
				subsequent.IsButtonVisible,
				Is.True);
			Assert.That(
				subsequent.LockitButtonText,
				Is.EqualTo("Reserve / Rent"));
			Assert.That(
				subsequent.IsLockitButtonVisible,
				Is.True);
		}

		/// <summary>
		/// Use case: Try book reserve bike.
		/// Final state: Bike is disposable.
		/// </summary>
		[Test]
		public void TestReserveDoReserveFailsWebConnectFailureException()
		{
			var bike = Substitute.For<IBikeInfoMutable>();
			var connector = Substitute.For<IConnector>();
			var command = Substitute.For<ICommand>();
			var pollingManager = Substitute.For<IPollingUpdateTaskManager>();
			var viewService = Substitute.For<IViewService>();
			var bikesViewModel = Substitute.For<IBikesViewModel>();
			var activeUser = Substitute.For<IUser>();

			bike.TariffDescription.MaxReservationTimeSpan.Returns(TimeSpan.FromMinutes(15));

			var handler = new DisposableClosed(
				bike,
				() => true, // isConnectedDelegate
				(isConnected) => connector,
				() => pollingManager,
				Substitute.For<ISmartDevice>(),
				viewService,
				bikesViewModel,
				activeUser);

			bike.Id.Returns("0");

			viewService.DisplayAlert(
				string.Empty,
				"Reserve bike Nr. 0 free of charge for 15 min?",
				"Yes",
				"No").Returns(Task.FromResult(true));

			bike.LockInfo.State.Returns(LockingState.Closed); // Locking state does not change.

			connector.Command.DoReserve(bike).Returns(x => throw new WebConnectFailureException("Context info", new Exception("Tst")));

			bike.State.Value.Returns(ShareeBike.Model.State.InUseStateEnum.Disposable); // State remains available because booking request failed.

			var subsequent = handler.HandleRequestOption2().Result;

			// Verify behavior
			Received.InOrder(() =>
			{
				bikesViewModel.Received(1).IsIdle = false; // GUI must be locked
				bikesViewModel.ActionText = "One moment please...";
				pollingManager.StopAsync(); // Polling must be stopped before any COPR and lock service action
				bikesViewModel.ActionText = "Reserving bike...";
				connector.Command.DoReserve(bike); // Booking must be performed
				bikesViewModel.ActionText = string.Empty;
				viewService.DisplayAlert(
					"Connection to booking system not possible.",
					"A stable Internet connection is required. Connect to WIFI or to mobile network and activate mobile data. Try again.",
					"OK");
				bikesViewModel.ActionText = "Updating...";
				pollingManager.StartAsync(); // polling must be restarted again
				bikesViewModel.ActionText = string.Empty;
				bikesViewModel.Received(1).IsIdle = true; // GUI must be unlocked
			});

			// Verify state after action
			Assert.That(
				subsequent.ButtonText,
				Is.EqualTo("Start rental & Open lock"));
			Assert.That(
				subsequent.IsButtonVisible,
				Is.True);
			Assert.That(
				subsequent.LockitButtonText,
				Is.EqualTo("Reserve / Rent"));
			Assert.That(
				subsequent.IsLockitButtonVisible,
				Is.True);
		}

		/// <summary>
		/// Use case: Try book reserve bike.
		/// Final state: Bike is disposable.
		/// </summary>
		[Test]
		public void TestReserveDoReserveFailsException()
		{
			var bike = Substitute.For<IBikeInfoMutable>();
			var connector = Substitute.For<IConnector>();
			var command = Substitute.For<ICommand>();
			var pollingManager = Substitute.For<IPollingUpdateTaskManager>();
			var viewService = Substitute.For<IViewService>();
			var bikesViewModel = Substitute.For<IBikesViewModel>();
			var activeUser = Substitute.For<IUser>();

			bike.TariffDescription.MaxReservationTimeSpan.Returns(TimeSpan.FromMinutes(15));

			var handler = new DisposableClosed(
				bike,
				() => true, // isConnectedDelegate
				(isConnected) => connector,
				() => pollingManager,
				Substitute.For<ISmartDevice>(),
				viewService,
				bikesViewModel,
				activeUser);

			bike.Id.Returns("0");

			viewService.DisplayAlert(
				string.Empty,
				"Reserve bike Nr. 0 free of charge for 15 min?",
				"Yes",
				"No").Returns(Task.FromResult(true));

			bike.LockInfo.State.Returns(LockingState.Closed); // Locking state does not change.

			connector.Command.DoReserve(bike).Returns(x => throw new Exception("Some error", new Exception("Inner exception")));

			bike.State.Value.Returns(ShareeBike.Model.State.InUseStateEnum.Disposable); // State remains available because booking request failed.

			var subsequent = handler.HandleRequestOption2().Result;

			// Verify behavior
			Received.InOrder(() =>
			{
				bikesViewModel.Received(1).IsIdle = false; // GUI must be locked
				bikesViewModel.ActionText = "One moment please...";
				pollingManager.StopAsync(); // Polling must be stopped before any COPR and lock service action
				bikesViewModel.ActionText = "Reserving bike...";
				connector.Command.DoReserve(bike); // Booking must be performed
				bikesViewModel.ActionText = string.Empty;
				viewService.DisplayAlert(
					"Bike could not be reserved!",
					"Some error",
					"OK");
				bikesViewModel.ActionText = "Updating...";
				pollingManager.StartAsync(); // polling must be restarted again
				bikesViewModel.ActionText = string.Empty;
				bikesViewModel.Received(1).IsIdle = true; // GUI must be unlocked
			});

			// Verify state after action
			Assert.That(
				subsequent.ButtonText,
				Is.EqualTo("Start rental & Open lock"));
			Assert.That(
				subsequent.IsButtonVisible,
				Is.True);
			Assert.That(
				subsequent.LockitButtonText,
				Is.EqualTo("Reserve / Rent"));
			Assert.That(
				subsequent.IsLockitButtonVisible,
				Is.True);
		}

		/// <summary>
		/// Use case: Reserve bike.
		/// Final state: Bike is booked and released from station.
		/// </summary>
		[Test]
		public void TestReserve()
		{
			var bike = Substitute.For<IBikeInfoMutable>();
			var connector = Substitute.For<IConnector>();
			var command = Substitute.For<ICommand>();
			var pollingManager = Substitute.For<IPollingUpdateTaskManager>();
			var viewService = Substitute.For<IViewService>();
			var bikesViewModel = Substitute.For<IBikesViewModel>();
			var activeUser = Substitute.For<IUser>();

			bike.TariffDescription.MaxReservationTimeSpan.Returns(TimeSpan.FromMinutes(15));

			var handler = new DisposableClosed(
				bike,
				() => true, // isConnectedDelegate
				(isConnected) => connector,
				() => pollingManager,
				Substitute.For<ISmartDevice>(),
				viewService,
				bikesViewModel,
				activeUser);

			bike.Id.Returns("0");

			viewService.DisplayAlert(
				string.Empty,
				"Reserve bike Nr. 0 free of charge for 15 min?",
				"Yes",
				"No").Returns(Task.FromResult(true));

			bike.LockInfo.State.Returns(LockingState.Open); // After Booking and opening, lock state is open.

			bike.State.Value.Returns(ShareeBike.Model.State.InUseStateEnum.Booked); // After Booking and opening, lock state is open.

			var subsequent = handler.HandleRequestOption2().Result;

			// Verify behavior
			Received.InOrder(() =>
			{
				bikesViewModel.Received(1).IsIdle = false; // GUI must be locked
				bikesViewModel.ActionText = "One moment please...";
				pollingManager.StopAsync(); // Polling must be stopped before any COPR and lock service action
				bikesViewModel.ActionText = "Reserving bike...";
				connector.Command.DoReserve(bike); // Booking must be performed
				bikesViewModel.ActionText = "Updating...";
				pollingManager.StartAsync(); // polling must be restarted again
				bikesViewModel.ActionText = string.Empty;
				bikesViewModel.Received(1).IsIdle = true; // GUI must be unlocked
			});

			// Verify state 
			Assert.That(
				subsequent.ButtonText,
				Is.EqualTo("BookedOpen"));
			Assert.That(
				subsequent.IsButtonVisible,
				Is.False);
			Assert.That(
				subsequent.LockitButtonText,
				Is.EqualTo("Open lock"));
			Assert.That(
				subsequent.IsLockitButtonVisible,
				Is.True);
		}
	}
}