using System;
using System.Threading;
using System.Threading.Tasks;
using NSubstitute;
using NUnit.Framework;
using Plugin.BLE.Abstractions;
using Plugin.BLE.Abstractions.Contracts;
using ShareeBike.Services.BluetoothLock.BLE;
using ShareeBike.Services.BluetoothLock.Exception;
using ShareeBike.Services.BluetoothLock.Tdo;

namespace SharedBusinessLogic.Tests.Fixtures.ObjectTests.Settings.BluetoothLock
{
	[TestFixture]
	public class TestLockIt
	{
		[Test]
		public void TestAuthenticate_InvalidSeed()
		{
			var device = Substitute.For<IDevice>();
			var adapter = Substitute.For<IAdapter>();
			var ciper = Substitute.For<ShareeBike.Model.Device.ICipher>();

			var authInfo = new LockInfoAuthTdo.Builder
			{
				K_seed = new byte[] { 0 },
				K_u = new byte[] { 1 }
			}.Build();

			device.State.Returns(DeviceState.Connected);

			device.Id.Returns(new Guid("00000000-0000-0000-0000-000000000001"));

			Assert.That(() => LockItEventBased.Authenticate(device, authInfo, adapter, ciper), Throws.InstanceOf<AuthKeyException>());
		}

		[Test]
		public void TestAuthenticate_InvalidAuthKey()
		{
			var device = Substitute.For<IDevice>();
			var adapter = Substitute.For<IAdapter>();
			var ciper = Substitute.For<ShareeBike.Model.Device.ICipher>();

			var authInfo = new LockInfoAuthTdo.Builder
			{
				K_seed = new byte[] { (byte)'t', (byte)'q', (byte)'2', (byte)'n', (byte)'c', (byte)'A', (byte)'I', (byte)'v', (byte)'M', (byte)'t', (byte)'h', (byte)'g', (byte)'x', (byte)'a', (byte)'z', (byte)'B' },
				K_u = new byte[] { }
			}.Build();

			device.State.Returns(DeviceState.Connected);
			device.Id.Returns(new Guid("00000000-0000-0000-0000-000000000001"));

			Assert.That(async () => { await LockItEventBased.Authenticate(device, authInfo, adapter, ciper); }, Throws.InstanceOf<AuthKeyException>());
		}

		[Test]
		public void TestAuthenticate_Invalidated()
		{
			var device = Substitute.For<IDevice>();
			var adapter = Substitute.For<IAdapter>();
			var cipher = Substitute.For<ShareeBike.Model.Device.ICipher>();
			var auth = Substitute.For<ICharacteristic>();
			var lockControl = Substitute.For<IService>();
			var state = Substitute.For<ICharacteristic>();
			var activateLock = Substitute.For<ICharacteristic>();

			var authInfo = new LockInfoAuthTdo.Builder
			{
				K_seed = new byte[] { (byte)'z', (byte)'D', (byte)'G', (byte)'x', (byte)'q', (byte)'M', (byte)'f', (byte)'A', (byte)'F', (byte)'q', (byte)'g', (byte)'N', (byte)'V', (byte)'r', (byte)'N', (byte)'Y' },
				K_u = new byte[] { 1 }
			}.Build();

			// Calls related to Authenticate functionality.
			device.State.Returns(DeviceState.Connected);
			device.Id.Returns(new Guid("0000f00d-1212-efde-1523-785fef13d123"));
			device.GetServiceAsync(Arg.Any<Guid>(), Arg.Any<CancellationToken>()).Returns(Task.FromResult(lockControl));
			lockControl.GetCharacteristicAsync(new Guid("0000baab-1212-efde-1523-785fef13d123")).Returns(Task.FromResult(auth));
			auth.WriteAsync(Arg.Any<byte[]>()).Returns(Task.FromResult(LockItBase.ERRORCODE_SUCCESS));
			auth.ReadAsync(Arg.Any<CancellationToken>()).Returns(Task.FromResult((new byte[8], LockItBase.ERRORCODE_SUCCESS)));
			cipher.Decrypt(Arg.Any<byte[]>(), Arg.Any<byte[]>()).Returns(new byte[3]);
			cipher.Encrypt(Arg.Any<byte[]>(), Arg.Any<byte[]>()).Returns(new byte[16]);
			auth.WriteAsync(Arg.Any<byte[]>()).Returns(LockItBase.ERRORCODE_SUCCESS);
			device.State.Returns(DeviceState.Connected);
			device.Id.Returns(new Guid("00000000-0000-0000-0000-000000000001"));

			// Call authenticate to invalidate seed
			var lockIt = LockItEventBased.Authenticate(device, authInfo, adapter, cipher).Result;

			// Authenticate again to 
			var execption = Assert.Throws<AggregateException>(() => { var dummy = LockItEventBased.Authenticate(device, authInfo, adapter, cipher).Result; });

			Assert.That(
				execption.InnerExceptions[0].Message,
				Does.Contain("Seed 122,68,71,120,113,77,102,65,70,113,103,78,86,114,78,89 was already used."));

		}

		[Test]
		public void TestAuthenticate_GetAuthCharacteristicThrowsException()
		{
			var device = Substitute.For<IDevice>();
			var adapter = Substitute.For<IAdapter>();
			var cipher = Substitute.For<ShareeBike.Model.Device.ICipher>();
			var auth = Substitute.For<ICharacteristic>();
			var lockControl = Substitute.For<IService>();
			var state = Substitute.For<ICharacteristic>();
			var activateLock = Substitute.For<ICharacteristic>();

			var authInfo = new LockInfoAuthTdo.Builder
			{
				K_seed = new byte[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
				K_u = new byte[] { 1 }
			}.Build();

			// Calls related to Authenticate functionality.
			device.State.Returns(DeviceState.Connected);
			device.Id.Returns(new Guid("0000f00d-1212-efde-1523-785fef13d123"));
			device.GetServiceAsync(Arg.Any<Guid>(), Arg.Any<CancellationToken>()).Returns(Task.FromResult(lockControl));
			lockControl.GetCharacteristicAsync(new Guid("0000baab-1212-efde-1523-785fef13d123")).Returns(Task.FromResult((ICharacteristic)null));

			// Authenticate again to 
			Assert.That(() => LockItEventBased.Authenticate(device, authInfo, adapter, cipher), Throws.InstanceOf<CoundntGetCharacteristicException>());
		}

		[Test]
		public async Task TestAuthenticate_GetLockState_Closed()
		{
			var device = Substitute.For<IDevice>();
			var adapter = Substitute.For<IAdapter>();
			var cipher = Substitute.For<ShareeBike.Model.Device.ICipher>();
			var auth = Substitute.For<ICharacteristic>();
			var lockControl = Substitute.For<IService>();
			var state = Substitute.For<ICharacteristic>();

			var authInfo = new LockInfoAuthTdo.Builder
			{
				K_seed = new byte[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
				K_u = new byte[] { 1 }
			}.Build();

			// Calls related to Authenticate functionality.
			device.State.Returns(DeviceState.Connected);
			device.Id.Returns(new Guid("0000f00d-1212-efde-1523-785fef13d123"));
			device.GetServiceAsync(Arg.Any<Guid>(), Arg.Any<CancellationToken>()).Returns(Task.FromResult(lockControl));
			lockControl.GetCharacteristicAsync(new Guid("0000baab-1212-efde-1523-785fef13d123")).Returns(Task.FromResult(auth));
			auth.WriteAsync(Arg.Any<byte[]>()).Returns(Task.FromResult(LockItBase.ERRORCODE_SUCCESS));
			auth.ReadAsync(Arg.Any<CancellationToken>()).Returns(Task.FromResult((new byte[8], LockItBase.ERRORCODE_SUCCESS)));
			cipher.Decrypt(Arg.Any<byte[]>(), Arg.Any<byte[]>()).Returns(new byte[3]);
			cipher.Encrypt(Arg.Any<byte[]>(), Arg.Any<byte[]>()).Returns(new byte[16]);
			auth.WriteAsync(Arg.Any<byte[]>()).Returns(LockItBase.ERRORCODE_SUCCESS);
			device.State.Returns(DeviceState.Connected);
			device.Id.Returns(new Guid("00000000-0000-0000-0000-000000000001"));
			// Calls related to get lock state.

			// Call authenticate to invalidate seed
			lockControl.GetCharacteristicAsync(new Guid("0000baaa-1212-efde-1523-785fef13d123")).Returns(Task.FromResult(state));
			state.ReadAsync(Arg.Any<CancellationToken>()).Returns((new byte[] { 1 }, LockItBase.ERRORCODE_SUCCESS));

			var lockIt = LockItEventBased.Authenticate(device, authInfo, adapter, cipher).Result;

			Assert.That((await lockIt.GetLockStateAsync()).State, Is.EqualTo(LockitLockingState.Closed));
		}

		[Test]
		public async Task TestAuthenticate_GetLockState_UndefinedState()
		{
			var device = Substitute.For<IDevice>();
			var adapter = Substitute.For<IAdapter>();
			var cipher = Substitute.For<ShareeBike.Model.Device.ICipher>();
			var auth = Substitute.For<ICharacteristic>();
			var lockControl = Substitute.For<IService>();
			var state = Substitute.For<ICharacteristic>();

			var authInfo = new LockInfoAuthTdo.Builder
			{
				K_seed = new byte[] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2 },
				K_u = new byte[] { 1 }
			}.Build();

			// Calls related to Authenticate functionality.
			device.State.Returns(DeviceState.Connected);
			device.Id.Returns(new Guid("0000f00d-1212-efde-1523-785fef13d123"));
			device.GetServiceAsync(Arg.Any<Guid>(), Arg.Any<CancellationToken>()).Returns(Task.FromResult(lockControl));
			lockControl.GetCharacteristicAsync(new Guid("0000baab-1212-efde-1523-785fef13d123")).Returns(Task.FromResult(auth));
			auth.WriteAsync(Arg.Any<byte[]>()).Returns(Task.FromResult(LockItBase.ERRORCODE_SUCCESS));
			auth.ReadAsync(Arg.Any<CancellationToken>()).Returns(Task.FromResult((new byte[8], LockItBase.ERRORCODE_SUCCESS)));
			cipher.Decrypt(Arg.Any<byte[]>(), Arg.Any<byte[]>()).Returns(new byte[3]);
			cipher.Encrypt(Arg.Any<byte[]>(), Arg.Any<byte[]>()).Returns(new byte[16]);
			auth.WriteAsync(Arg.Any<byte[]>()).Returns(LockItBase.ERRORCODE_SUCCESS);
			device.State.Returns(DeviceState.Connected);
			device.Id.Returns(new Guid("00000000-0000-0000-0000-000000000001"));
			// Calls related to get lock state.

			// Call authenticate to invalidate seed
			lockControl.GetCharacteristicAsync(new Guid("0000baaa-1212-efde-1523-785fef13d123")).Returns(Task.FromResult(state));
			state.ReadAsync(Arg.Any<CancellationToken>()).Returns((new byte[] { 99 }, LockItBase.ERRORCODE_SUCCESS)); // This value should never be returned from ILockit.

			var lockIt = LockItEventBased.Authenticate(device, authInfo, adapter, cipher).Result;

			Assert.That((await lockIt.GetLockStateAsync()).State, Is.Null);
		}

		[Test]
		public void TestAuthenticate_GetLockState_GetStateCharacteristicThrowsException()
		{
			var device = Substitute.For<IDevice>();
			var adapter = Substitute.For<IAdapter>();
			var cipher = Substitute.For<ShareeBike.Model.Device.ICipher>();
			var auth = Substitute.For<ICharacteristic>();
			var lockControl = Substitute.For<IService>();

			var authInfo = new LockInfoAuthTdo.Builder
			{
				K_seed = new byte[] { (byte)'y', (byte)'D', (byte)'G', (byte)'x', (byte)'q', (byte)'M', (byte)'f', (byte)'A', (byte)'F', (byte)'q', (byte)'g', (byte)'N', (byte)'V', (byte)'r', (byte)'N', (byte)'Y' },
				K_u = new byte[] { 1 }
			}.Build();

			// Calls related to Authenticate functionality.
			device.State.Returns(DeviceState.Connected);
			device.Id.Returns(new Guid("0000f00d-1212-efde-1523-785fef13d123"));
			device.GetServiceAsync(Arg.Any<Guid>(), Arg.Any<CancellationToken>()).Returns(Task.FromResult(lockControl));
			lockControl.GetCharacteristicAsync(new Guid("0000baab-1212-efde-1523-785fef13d123")).Returns(Task.FromResult(auth));
			auth.WriteAsync(Arg.Any<byte[]>()).Returns(Task.FromResult(LockItBase.ERRORCODE_SUCCESS));
			auth.ReadAsync(Arg.Any<CancellationToken>()).Returns((Task.FromResult((new byte[8], LockItBase.ERRORCODE_SUCCESS))));
			cipher.Decrypt(Arg.Any<byte[]>(), Arg.Any<byte[]>()).Returns(new byte[3]);
			cipher.Encrypt(Arg.Any<byte[]>(), Arg.Any<byte[]>()).Returns(new byte[16]);
			auth.WriteAsync(Arg.Any<byte[]>()).Returns(LockItBase.ERRORCODE_SUCCESS);
			device.State.Returns(DeviceState.Connected);
			device.Id.Returns(new Guid("00000000-0000-0000-0000-000000000001"));

			// Calls related to get lock state.
			lockControl.GetCharacteristicAsync(new Guid("0000baaa-1212-efde-1523-785fef13d123")).Returns(Task.FromResult((ICharacteristic)null));

			var lockIt = LockItEventBased.Authenticate(device, authInfo, adapter, cipher).Result;

			Assert.That(async () => (await lockIt.GetLockStateAsync()).State, Throws.InstanceOf<CoundntGetCharacteristicException>());
		}
	}
}