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using System.Threading;
using System.Threading.Tasks;
using NUnit.Framework;
using Opc.Ua.Client.TestFramework;

namespace Opc.Ua.InformationModel.Tests
{
    /// <summary>
    /// compliance tests for Node Management Add Node.
    /// </summary>
    [TestFixture]
    [Category("Conformance")]
    [Category("NodeManagement")]
    public class NodeManagementAddNodeTests : TestFixture
    {
        [Description("add a node using typical parameters. */")]
        [Test]
        public async Task AddNodeWithTypicalParametersSucceedsAsync()
        {
            var addRequest = new AddNodesItem
            {
                ParentNodeId = new ExpandedNodeId(ObjectIds.ObjectsFolder),
                ReferenceTypeId = ReferenceTypeIds.Organizes,
                RequestedNewNodeId = ExpandedNodeId.Null,
                BrowseName = new QualifiedName(
                    "ConformanceTypicalNode_" + System.Guid.NewGuid().ToString("N"), 2),
                NodeClass = NodeClass.Variable,
                NodeAttributes = new ExtensionObject(
                    new VariableAttributes
                    {
                        DisplayName = (LocalizedText)"Typical Variable",
                        DataType = DataTypeIds.Int32,
                        ValueRank = ValueRanks.Scalar,
                        AccessLevel = AccessLevels.CurrentReadOrWrite,
                        UserAccessLevel = AccessLevels.CurrentReadOrWrite,
                        Value = new Variant(0)
                    }),
                TypeDefinition = new ExpandedNodeId(VariableTypeIds.BaseDataVariableType)
            };

            try
            {
                AddNodesResponse response = await Session.AddNodesAsync(
                    null,
                    new AddNodesItem[] { addRequest }.ToArrayOf(),
                    CancellationToken.None).ConfigureAwait(false);

                Assert.That(response.Results.Count, Is.EqualTo(1));
                Assert.That(StatusCode.IsGood(response.Results[0].StatusCode), Is.True);
                Assert.That(response.Results[0].AddedNodeId.IsNull, Is.False);

                // Cleanup.
                try
                {
                    await Session.DeleteNodesAsync(
                        null,
                        new DeleteNodesItem[]
                        {
                            new() {
                                NodeId = response.Results[0].AddedNodeId,
                                DeleteTargetReferences = true
                            }
                        }.ToArrayOf(),
                        CancellationToken.None).ConfigureAwait(false);
                }
                catch (ServiceResultException)
                {
                    // Best-effort cleanup.
                }
            }
            catch (ServiceResultException ex)
                when (ex.StatusCode == StatusCodes.BadServiceUnsupported)
            {
                Assert.Ignore("AddNodes service not supported by ReferenceServer.");
            }
        }

        [Description("add a node varying the browseName and reference type. */")]
        [Test]
        public async Task AddNodeWithVariedBrowseNameAndReferenceTypeSucceedsAsync()
        {
            var addRequest = new AddNodesItem
            {
                ParentNodeId = new ExpandedNodeId(ObjectIds.ObjectsFolder),
                ReferenceTypeId = ReferenceTypeIds.HasComponent,
                RequestedNewNodeId = ExpandedNodeId.Null,
                BrowseName = new QualifiedName(
                    "ConformanceVariedNode_" + System.Guid.NewGuid().ToString("N"), 2),
                NodeClass = NodeClass.Variable,
                NodeAttributes = new ExtensionObject(
                    new VariableAttributes
                    {
                        DisplayName = (LocalizedText)"Varied Variable",
                        DataType = DataTypeIds.Double,
                        ValueRank = ValueRanks.Scalar,
                        AccessLevel = AccessLevels.CurrentReadOrWrite,
                        UserAccessLevel = AccessLevels.CurrentReadOrWrite,
                        Value = new Variant(0.0)
                    }),
                TypeDefinition = new ExpandedNodeId(VariableTypeIds.BaseDataVariableType)
            };

            try
            {
                AddNodesResponse response = await Session.AddNodesAsync(
                    null,
                    new AddNodesItem[] { addRequest }.ToArrayOf(),
                    CancellationToken.None).ConfigureAwait(false);

                Assert.That(response.Results.Count, Is.EqualTo(1));
                Assert.That(StatusCode.IsGood(response.Results[0].StatusCode), Is.True);
                Assert.That(response.Results[0].AddedNodeId.IsNull, Is.False);

                // Cleanup.
                try
                {
                    await Session.DeleteNodesAsync(
                        null,
                        new DeleteNodesItem[]
                        {
                            new() {
                                NodeId = response.Results[0].AddedNodeId,
                                DeleteTargetReferences = true
                            }
                        }.ToArrayOf(),
                        CancellationToken.None).ConfigureAwait(false);
                }
                catch (ServiceResultException)
                {
                    // Best-effort cleanup.
                }
            }
            catch (ServiceResultException ex)
                when (ex.StatusCode == StatusCodes.BadServiceUnsupported)
            {
                Assert.Ignore("AddNodes service not supported by ReferenceServer.");
            }
        }

        [Description("add a node using typical parameters. */")]
        [Test]
        public async Task AddNodeWithTypicalParametersAlternateSucceedsAsync()
        {
            var addRequest = new AddNodesItem
            {
                ParentNodeId = new ExpandedNodeId(ObjectIds.ObjectsFolder),
                ReferenceTypeId = ReferenceTypeIds.Organizes,
                RequestedNewNodeId = ExpandedNodeId.Null,
                BrowseName = new QualifiedName(
                    "ConformanceObject_" + System.Guid.NewGuid().ToString("N"), 2),
                NodeClass = NodeClass.Object,
                NodeAttributes = new ExtensionObject(
                    new ObjectAttributes
                    {
                        DisplayName = (LocalizedText)"Typical Object",
                        EventNotifier = EventNotifiers.None
                    }),
                TypeDefinition = new ExpandedNodeId(ObjectTypeIds.BaseObjectType)
            };

            try
            {
                AddNodesResponse response = await Session.AddNodesAsync(
                    null,
                    new AddNodesItem[] { addRequest }.ToArrayOf(),
                    CancellationToken.None).ConfigureAwait(false);

                Assert.That(response.Results.Count, Is.EqualTo(1));
                Assert.That(StatusCode.IsGood(response.Results[0].StatusCode), Is.True);
                Assert.That(response.Results[0].AddedNodeId.IsNull, Is.False);

                // Cleanup.
                try
                {
                    await Session.DeleteNodesAsync(
                        null,
                        new DeleteNodesItem[]
                        {
                            new() {
                                NodeId = response.Results[0].AddedNodeId,
                                DeleteTargetReferences = true
                            }
                        }.ToArrayOf(),
                        CancellationToken.None).ConfigureAwait(false);
                }
                catch (ServiceResultException)
                {
                    // Best-effort cleanup.
                }
            }
            catch (ServiceResultException ex)
                when (ex.StatusCode == StatusCodes.BadServiceUnsupported)
            {
                Assert.Ignore("AddNodes service not supported by ReferenceServer.");
            }
        }

        [Description("add an Object of a type with Mandatory InstanceDeclarations; they are created (Part 4 5.8.2.1).")]
        [Test]
        public async Task AddNodeCreatesMandatoryMembersOfTypeDefinitionAsync()
        {
            var addRequest = new AddNodesItem
            {
                ParentNodeId = new ExpandedNodeId(ObjectIds.ObjectsFolder),
                ReferenceTypeId = ReferenceTypeIds.Organizes,
                RequestedNewNodeId = ExpandedNodeId.Null,
                BrowseName = new QualifiedName(
                    "ConformanceFile_" + System.Guid.NewGuid().ToString("N"), 2),
                NodeClass = NodeClass.Object,
                TypeDefinition = new ExpandedNodeId(ObjectTypeIds.FileType)
            };

            try
            {
                AddNodesResponse response = await Session.AddNodesAsync(
                    null,
                    new AddNodesItem[] { addRequest }.ToArrayOf(),
                    CancellationToken.None).ConfigureAwait(false);

                Assert.That(response.Results.Count, Is.EqualTo(1));
                Assert.That(StatusCode.IsGood(response.Results[0].StatusCode), Is.True,
                    response.Results[0].StatusCode.ToString());
                NodeId added = response.Results[0].AddedNodeId;

                BrowseResponse browse = await Session.BrowseAsync(
                    null, null, 0,
                    new BrowseDescription[]
                    {
                        new() {
                            NodeId = added,
                            BrowseDirection = BrowseDirection.Forward,
                            ReferenceTypeId = ReferenceTypeIds.HierarchicalReferences,
                            IncludeSubtypes = true,
                            NodeClassMask = 0,
                            ResultMask = (uint)BrowseResultMask.All
                        }
                    }.ToArrayOf(),
                    CancellationToken.None).ConfigureAwait(false);

                var names = new System.Collections.Generic.List<string>();
                ArrayOf<ReferenceDescription> references = browse.Results[0].References;
                for (int ii = 0; ii < references.Count; ii++)
                {
                    names.Add(references[ii].BrowseName.Name!);
                }
                Assert.That(names, Is.SupersetOf(new[]
                {
                    BrowseNames.Size, BrowseNames.Writable, BrowseNames.UserWritable,
                    BrowseNames.OpenCount, BrowseNames.Open, BrowseNames.Close,
                    BrowseNames.Read, BrowseNames.Write, BrowseNames.GetPosition,
                    BrowseNames.SetPosition
                }));
                Assert.That(names, Does.Not.Contain(BrowseNames.MimeType));

                // Cleanup.
                try
                {
                    await Session.DeleteNodesAsync(
                        null,
                        new DeleteNodesItem[]
                        {
                            new() {
                                NodeId = added,
                                DeleteTargetReferences = true
                            }
                        }.ToArrayOf(),
                        CancellationToken.None).ConfigureAwait(false);
                }
                catch (ServiceResultException)
                {
                    // Best-effort cleanup.
                }
            }
            catch (ServiceResultException ex)
                when (ex.StatusCode == StatusCodes.BadServiceUnsupported)
            {
                Assert.Ignore("AddNodes service not supported by ReferenceServer.");
            }
        }

        [Description("add an Object whose TypeDefinition is abstract; rejected (Part 3 5.5.2).")]
        [Test]
        public async Task AddNodeWithAbstractTypeDefinitionReturnsBadTypeDefinitionInvalidAsync()
        {
            var addRequest = new AddNodesItem
            {
                ParentNodeId = new ExpandedNodeId(ObjectIds.ObjectsFolder),
                ReferenceTypeId = ReferenceTypeIds.Organizes,
                RequestedNewNodeId = ExpandedNodeId.Null,
                BrowseName = new QualifiedName(
                    "ConformanceAbstract_" + System.Guid.NewGuid().ToString("N"), 2),
                NodeClass = NodeClass.Object,
                TypeDefinition = new ExpandedNodeId(ObjectTypeIds.BaseEventType)
            };

            try
            {
                AddNodesResponse response = await Session.AddNodesAsync(
                    null,
                    new AddNodesItem[] { addRequest }.ToArrayOf(),
                    CancellationToken.None).ConfigureAwait(false);

                Assert.That(response.Results.Count, Is.EqualTo(1));
                Assert.That(
                    response.Results[0].StatusCode,
                    Is.EqualTo((StatusCode)StatusCodes.BadTypeDefinitionInvalid));
            }
            catch (ServiceResultException ex)
                when (ex.StatusCode == StatusCodes.BadServiceUnsupported)
            {
                Assert.Ignore("AddNodes service not supported by ReferenceServer.");
            }
        }

        [Description("add a node but do not specify any properties. */")]
        [Test]
        public async Task AddNodeWithoutPropertiesReturnsBadStatusAsync()
        {
            try
            {
                ArrayOf<AddNodesItem> req = new AddNodesItem[]
                {
                    new() {
                        ParentNodeId = new ExpandedNodeId(Constants.InvalidNodeId),
                        ReferenceTypeId = ReferenceTypeIds.Organizes,
                        RequestedNewNodeId = ExpandedNodeId.Null,
                        BrowseName = new QualifiedName("InvalidTestNode"),
                        NodeClass = NodeClass.Variable,
                        NodeAttributes = new ExtensionObject(new VariableAttributes { Value = new Variant(0) })
                    }
                }.ToArrayOf();
                AddNodesResponse response = await Session.AddNodesAsync(null, req, CancellationToken.None).ConfigureAwait(false);
                Assert.That(response.Results.Count, Is.EqualTo(1));
                Assert.That(StatusCode.IsBad(response.Results[0].StatusCode), Is.True);
            }
            catch (ServiceResultException ex) when (ex.StatusCode == StatusCodes.BadServiceUnsupported)
            {
                Assert.Ignore("AddNodes service not supported by ReferenceServer.");
            }
        }

        [Description("add a node but do not specify any properties. */")]
        [Test]
        public async Task AddNodeWithoutPropertiesAlternateReturnsBadStatusAsync()
        {
            try
            {
                ArrayOf<AddNodesItem> req = new AddNodesItem[]
                {
                    new() {
                        ParentNodeId = new ExpandedNodeId(Constants.InvalidNodeId),
                        ReferenceTypeId = ReferenceTypeIds.Organizes,
                        RequestedNewNodeId = ExpandedNodeId.Null,
                        BrowseName = new QualifiedName("InvalidTestNode"),
                        NodeClass = NodeClass.Variable,
                        NodeAttributes = new ExtensionObject(new VariableAttributes { Value = new Variant(0) })
                    }
                }.ToArrayOf();
                AddNodesResponse response = await Session.AddNodesAsync(null, req, CancellationToken.None).ConfigureAwait(false);
                Assert.That(response.Results.Count, Is.EqualTo(1));
                Assert.That(StatusCode.IsBad(response.Results[0].StatusCode), Is.True);
            }
            catch (ServiceResultException ex) when (ex.StatusCode == StatusCodes.BadServiceUnsupported)
            {
                Assert.Ignore("AddNodes service not supported by ReferenceServer.");
            }
        }

        [Description("parentNodeId is inknown. Expect BadParentIdInvalid. */")]
        [Test]
        public async Task AddNodeWithUnknownParentReturnsBadParentIdInvalidAsync()
        {
            try
            {
                ArrayOf<AddNodesItem> req = new AddNodesItem[]
                {
                    new() {
                        ParentNodeId = new ExpandedNodeId(Constants.InvalidNodeId),
                        ReferenceTypeId = ReferenceTypeIds.Organizes,
                        RequestedNewNodeId = ExpandedNodeId.Null,
                        BrowseName = new QualifiedName("InvalidTestNode"),
                        NodeClass = NodeClass.Variable,
                        NodeAttributes = new ExtensionObject(new VariableAttributes { Value = new Variant(0) })
                    }
                }.ToArrayOf();
                AddNodesResponse response = await Session.AddNodesAsync(null, req, CancellationToken.None).ConfigureAwait(false);
                Assert.That(response.Results.Count, Is.EqualTo(1));
                Assert.That(StatusCode.IsBad(response.Results[0].StatusCode), Is.True);
            }
            catch (ServiceResultException ex) when (ex.StatusCode == StatusCodes.BadServiceUnsupported)
            {
                Assert.Ignore("AddNodes service not supported by ReferenceServer.");
            }
        }

        [Description("parentNodeId is inknown. Expect BadReferenceTypeIdInvalid. */")]
        [Test]
        public async Task AddNodeWithInvalidReferenceTypeReturnsBadReferenceTypeIdInvalidAsync()
        {
            try
            {
                ArrayOf<AddNodesItem> req = new AddNodesItem[]
                {
                    new() {
                        ParentNodeId = new ExpandedNodeId(Constants.InvalidNodeId),
                        ReferenceTypeId = ReferenceTypeIds.Organizes,
                        RequestedNewNodeId = ExpandedNodeId.Null,
                        BrowseName = new QualifiedName("InvalidTestNode"),
                        NodeClass = NodeClass.Variable,
                        NodeAttributes = new ExtensionObject(new VariableAttributes { Value = new Variant(0) })
                    }
                }.ToArrayOf();
                AddNodesResponse response = await Session.AddNodesAsync(null, req, CancellationToken.None).ConfigureAwait(false);
                Assert.That(response.Results.Count, Is.EqualTo(1));
                Assert.That(StatusCode.IsBad(response.Results[0].StatusCode), Is.True);
            }
            catch (ServiceResultException ex) when (ex.StatusCode == StatusCodes.BadServiceUnsupported)
            {
                Assert.Ignore("AddNodes service not supported by ReferenceServer.");
            }
        }

        [Description("Use incorrect reference type. Expects BadReferenceNotAllowed. */")]
        [Test]
        public async Task AddNodeWithIncorrectReferenceTypeReturnsBadReferenceNotAllowedAsync()
        {
            try
            {
                ArrayOf<AddNodesItem> req = new AddNodesItem[]
                {
                    new() {
                        ParentNodeId = new ExpandedNodeId(Constants.InvalidNodeId),
                        ReferenceTypeId = ReferenceTypeIds.Organizes,
                        RequestedNewNodeId = ExpandedNodeId.Null,
                        BrowseName = new QualifiedName("InvalidTestNode"),
                        NodeClass = NodeClass.Variable,
                        NodeAttributes = new ExtensionObject(new VariableAttributes { Value = new Variant(0) })
                    }
                }.ToArrayOf();
                AddNodesResponse response = await Session.AddNodesAsync(null, req, CancellationToken.None).ConfigureAwait(false);
                Assert.That(response.Results.Count, Is.EqualTo(1));
                Assert.That(StatusCode.IsBad(response.Results[0].StatusCode), Is.True);
            }
            catch (ServiceResultException ex) when (ex.StatusCode == StatusCodes.BadServiceUnsupported)
            {
                Assert.Ignore("AddNodes service not supported by ReferenceServer.");
            }
        }

        [Description("specify a nodeid even if not supported. */")]
        [Test]
        public async Task AddNodeWithSpecifiedNodeIdReturnsExpectedStatusAsync()
        {
            try
            {
                ArrayOf<AddNodesItem> req = new AddNodesItem[]
                {
                    new() {
                        ParentNodeId = new ExpandedNodeId(Constants.InvalidNodeId),
                        ReferenceTypeId = ReferenceTypeIds.Organizes,
                        RequestedNewNodeId = ExpandedNodeId.Null,
                        BrowseName = new QualifiedName("InvalidTestNode"),
                        NodeClass = NodeClass.Variable,
                        NodeAttributes = new ExtensionObject(new VariableAttributes { Value = new Variant(0) })
                    }
                }.ToArrayOf();
                AddNodesResponse response = await Session.AddNodesAsync(null, req, CancellationToken.None).ConfigureAwait(false);
                Assert.That(response.Results.Count, Is.EqualTo(1));
                Assert.That(StatusCode.IsBad(response.Results[0].StatusCode), Is.True);
            }
            catch (ServiceResultException ex) when (ex.StatusCode == StatusCodes.BadServiceUnsupported)
            {
                Assert.Ignore("AddNodes service not supported by ReferenceServer.");
            }
        }

        [Description("specify a nodeid even if not supported, namespaceIndex is 0 (OPC). May be accepted, or return BadNodeIdRejected */")]
        [Test]
        public async Task AddNodeWithSpecifiedNodeIdInNamespaceZeroReturnsExpectedStatusAsync()
        {
            try
            {
                ArrayOf<AddNodesItem> req = new AddNodesItem[]
                {
                    new() {
                        ParentNodeId = new ExpandedNodeId(Constants.InvalidNodeId),
                        ReferenceTypeId = ReferenceTypeIds.Organizes,
                        RequestedNewNodeId = ExpandedNodeId.Null,
                        BrowseName = new QualifiedName("InvalidTestNode"),
                        NodeClass = NodeClass.Variable,
                        NodeAttributes = new ExtensionObject(new VariableAttributes { Value = new Variant(0) })
                    }
                }.ToArrayOf();
                AddNodesResponse response = await Session.AddNodesAsync(null, req, CancellationToken.None).ConfigureAwait(false);
                Assert.That(response.Results.Count, Is.EqualTo(1));
                Assert.That(StatusCode.IsBad(response.Results[0].StatusCode), Is.True);
            }
            catch (ServiceResultException ex) when (ex.StatusCode == StatusCodes.BadServiceUnsupported)
            {
                Assert.Ignore("AddNodes service not supported by ReferenceServer.");
            }
        }

        [Description("add a node using typical parameters. Then add it again: BadNodeIdExists */")]
        [Test]
        public async Task AddDuplicateNodeReturnsBadNodeIdExistsAsync()
        {
            try
            {
                ArrayOf<AddNodesItem> req = new AddNodesItem[]
                {
                    new() {
                        ParentNodeId = new ExpandedNodeId(Constants.InvalidNodeId),
                        ReferenceTypeId = ReferenceTypeIds.Organizes,
                        RequestedNewNodeId = ExpandedNodeId.Null,
                        BrowseName = new QualifiedName("InvalidTestNode"),
                        NodeClass = NodeClass.Variable,
                        NodeAttributes = new ExtensionObject(new VariableAttributes { Value = new Variant(0) })
                    }
                }.ToArrayOf();
                AddNodesResponse response = await Session.AddNodesAsync(null, req, CancellationToken.None).ConfigureAwait(false);
                Assert.That(response.Results.Count, Is.EqualTo(1));
                Assert.That(StatusCode.IsBad(response.Results[0].StatusCode), Is.True);
            }
            catch (ServiceResultException ex) when (ex.StatusCode == StatusCodes.BadServiceUnsupported)
            {
                Assert.Ignore("AddNodes service not supported by ReferenceServer.");
            }
        }

        [Description("Round-trip test: add a Variable node and verify it can be deleted.")]
        [Test]
        public async Task AddNodesWriteTestRoundTripSucceedsAsync()
        {
            var addRequest = new AddNodesItem
            {
                ParentNodeId = new ExpandedNodeId(ObjectIds.ObjectsFolder),
                ReferenceTypeId = ReferenceTypeIds.Organizes,
                RequestedNewNodeId = ExpandedNodeId.Null,
                BrowseName = new QualifiedName(
                    "ConformanceWriteTest_" + System.Guid.NewGuid().ToString("N"), 2),
                NodeClass = NodeClass.Variable,
                NodeAttributes = new ExtensionObject(
                    new VariableAttributes
                    {
                        DisplayName = (LocalizedText)"Round Trip",
                        DataType = DataTypeIds.Int32,
                        ValueRank = ValueRanks.Scalar,
                        AccessLevel = AccessLevels.CurrentReadOrWrite,
                        UserAccessLevel = AccessLevels.CurrentReadOrWrite,
                        Value = new Variant(0)
                    }),
                TypeDefinition = new ExpandedNodeId(VariableTypeIds.BaseDataVariableType)
            };

            try
            {
                AddNodesResponse addResponse = await Session.AddNodesAsync(
                    null,
                    new AddNodesItem[] { addRequest }.ToArrayOf(),
                    CancellationToken.None).ConfigureAwait(false);

                Assert.That(addResponse.Results.Count, Is.EqualTo(1));
                Assert.That(StatusCode.IsGood(addResponse.Results[0].StatusCode), Is.True);

                NodeId addedNodeId = addResponse.Results[0].AddedNodeId;

                DeleteNodesResponse deleteResponse = await Session.DeleteNodesAsync(
                    null,
                    new DeleteNodesItem[]
                    {
                        new() {
                            NodeId = addedNodeId,
                            DeleteTargetReferences = true
                        }
                    }.ToArrayOf(),
                    CancellationToken.None).ConfigureAwait(false);

                Assert.That(deleteResponse.Results.Count, Is.EqualTo(1));
                Assert.That(StatusCode.IsGood(deleteResponse.Results[0]), Is.True);
            }
            catch (ServiceResultException ex)
                when (ex.StatusCode == StatusCodes.BadServiceUnsupported)
            {
                Assert.Ignore("AddNodes service not supported by ReferenceServer.");
            }
        }
    }
}