/* ========================================================================
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 *
 * OPC Foundation MIT License 1.00
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
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 *
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using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using Opc.Ua;
using Opc.Ua.Server;
using Opc.Ua.Server.Historian;

namespace TestData
{
    /// <summary>
    /// The node manager factory for test data.
    /// </summary>
    public class TestDataNodeManagerFactory : IAsyncNodeManagerFactory
    {
        /// <inheritdoc/>
        public ValueTask<IAsyncNodeManager> CreateAsync(
            IServerInternal server,
            ApplicationConfiguration configuration,
            CancellationToken cancellationToken = default)
        {
#pragma warning disable CA2000 // ownership of TestDataNodeManager transfers to the caller via the returned ValueTask<IAsyncNodeManager>
            return new ValueTask<IAsyncNodeManager>(
                new TestDataNodeManager(server, configuration, [.. NamespacesUris]));
#pragma warning restore CA2000
        }

        /// <inheritdoc/>
        public ArrayOf<string> NamespacesUris
            => [Namespaces.TestData, Namespaces.TestData + "Instance"];
    }

    /// <summary>
    /// A node manager for a variety of test data.
    /// </summary>
    public class TestDataNodeManager : AsyncCustomNodeManager, ITestDataSystemCallback
    {
        /// <summary>
        /// Initializes the node manager.
        /// </summary>
        public TestDataNodeManager(
            IServerInternal server,
            ApplicationConfiguration configuration,
            string[] namespaceUris)
            : base(server, configuration, server.Telemetry.CreateLogger<TestDataNodeManager>())
        {
            // update the namespaces.
            NamespaceUris = namespaceUris;

            Server.Factory.Builder.AddTestData().Commit();

            // get the configuration for the node manager.
            m_configuration =
                configuration.ParseExtension<TestDataNodeManagerConfiguration>()
                ?? new TestDataNodeManagerConfiguration();

            // use suitable defaults if no configuration exists.

            m_lastUsedId = m_configuration.NextUnusedId - 1;

            // create the object used to access the test system.
            m_system = new TestDataSystem(
                this,
                server.NamespaceUris,
                server.ServerUris,
                server.Telemetry,
                (server as ITimeProviderProvider)?.TimeProvider);

            // update the default context.
            SystemContext.SystemHandle = m_system;
        }

        /// <inheritdoc/>
        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
#if CONDITION_SAMPLES
                m_systemStatusTimer?.Dispose();
                m_systemStatusCondition?.Dispose();
                m_dialog?.Dispose();

                m_systemStatusTimer = null;
                m_systemStatusCondition = null;
                m_dialog = null;
#endif
                (m_dataStaticStructureScalarStructure as IDisposable)?.Dispose();
                (m_dataDynamicStructureScalarStructure as IDisposable)?.Dispose();
                (m_dataStaticStructureVectorStructure as IDisposable)?.Dispose();
                (m_dataDynamicStructureVectorStructure as IDisposable)?.Dispose();
                (m_dataStaticVectorScalarValue as IDisposable)?.Dispose();
                (m_dataDynamicVectorScalarValue as IDisposable)?.Dispose();

                m_dataStaticStructureScalarStructure = null;
                m_dataDynamicStructureScalarStructure = null;
                m_dataStaticStructureVectorStructure = null;
                m_dataDynamicStructureVectorStructure = null;
                m_dataStaticVectorScalarValue = null;
                m_dataDynamicVectorScalarValue = null;
            }
            base.Dispose(disposing);
        }

        /// <summary>
        /// Updates the variable after receiving a notification that it has changed in the underlying system.
        /// </summary>
        public void OnDataChange(
            BaseVariableState variable,
            Variant value,
            StatusCode statusCode,
            DateTime timestamp)
        {
            lock (m_lock)
            {
                variable.Value = value;
                variable.StatusCode = statusCode;
                variable.Timestamp = timestamp;

                // notifies any monitored items that the value has changed.
                variable.ClearChangeMasks(SystemContext, false);
            }
        }

        /// <summary>
        /// Generates values for variables with properties.
        /// </summary>
        public void OnGenerateValues(BaseVariableState variable)
        {
            lock (m_lock)
            {
                if (variable is ITestDataSystemValuesGenerator generator)
                {
                    generator.OnGenerateValues(SystemContext);
                }
            }
        }

        /// <summary>
        /// Creates the NodeId for the specified node.
        /// </summary>
        /// <param name="context">The context.</param>
        /// <param name="node">The node.</param>
        /// <returns>The new NodeId.</returns>
        public override NodeId New(ISystemContext context, NodeState node)
        {
            uint id = Utils.IncrementIdentifier(ref m_lastUsedId);
            return new NodeId(id, m_namespaceIndex);
        }

        /// <summary>
        /// Does any initialization required before the address space can be used.
        /// </summary>
        /// <remarks>
        /// The externalReferences is an out parameter that allows the node manager to link to nodes
        /// in other node managers. For example, the 'Objects' node is managed by the CoreNodeManager and
        /// should have a reference to the root folder node(s) exposed by this node manager.
        /// </remarks>
        public override async ValueTask CreateAddressSpaceAsync(
            IDictionary<NodeId, IList<IReference>> externalReferences,
            CancellationToken cancellationToken = default)
        {
            // ensure the namespace used by the node manager is in the server's namespace table.
            m_typeNamespaceIndex = Server.NamespaceUris.GetIndexOrAppend(Namespaces.TestData);
            m_namespaceIndex = Server.NamespaceUris
                .GetIndexOrAppend(Namespaces.TestData + "Instance");

            await base.CreateAddressSpaceAsync(externalReferences, cancellationToken).ConfigureAwait(false);

#if CONDITION_SAMPLES
            // start monitoring the system status.
            m_systemStatusCondition = FindPredefinedNode<TestSystemConditionState>(
                new NodeId(Objects.Data_Conditions_SystemStatus, m_typeNamespaceIndex));

            if (m_systemStatusCondition != null)
            {
                m_systemStatusTimer?.Dispose();
                m_systemStatusTimer = new Timer(OnCheckSystemStatus, null, 5000, 5000);
                m_systemStatusCondition.Retain.Value = true;
            }
#endif
            // link all conditions to the conditions folder.
            NodeState? conditionsFolder = FindPredefinedNode<NodeState>(
                new NodeId(Objects.Data_Conditions, m_typeNamespaceIndex));

            foreach (NodeState node in PredefinedNodes.Values)
            {
                if (node is ConditionState condition &&
                    !ReferenceEquals(condition.Parent, conditionsFolder))
                {
                    condition.AddNotifier(SystemContext, default, true, conditionsFolder);
                    conditionsFolder!.AddNotifier(SystemContext, default, false, condition);
                }
            }

            // enable history for all numeric scalar values.
            ScalarValueObjectState? scalarValues = FindPredefinedNode<ScalarValueObjectState>(
                new NodeId(Objects.Data_Dynamic_Scalar, m_typeNamespaceIndex));

            BaseDataVariableState<int> int32Value = scalarValues!.Int32Value!;
            int32Value.Historizing = true;
            int32Value.AccessLevel = (byte)(
                int32Value.AccessLevel | AccessLevels.HistoryRead);

            m_system.EnableHistoryArchiving(SystemContext, int32Value);

            // Initialize Root Variable for structures with variables
            {
                ScalarStructureVariableState variable
                    = FindTypeState<ScalarStructureVariableState>(
                    Variables.Data_Static_Structure_ScalarStructure)!;
                m_dataStaticStructureScalarStructure = new ScalarStructureVariableValue(
                    variable,
                    m_system.GetRandomScalarStructureDataType(),
                    null!);
            }
            {
                ScalarStructureVariableState variable
                    = FindTypeState<ScalarStructureVariableState>(
                    Variables.Data_Dynamic_Structure_ScalarStructure)!;
                m_dataDynamicStructureScalarStructure = new ScalarStructureVariableValue(
                    variable,
                    m_system.GetRandomScalarStructureDataType(),
                    null!);
            }
            {
                VectorVariableState variable = FindTypeState<VectorVariableState>(
                    Variables.Data_Static_Structure_VectorStructure)!;
                m_dataStaticStructureVectorStructure = new VectorVariableValue(
                    variable,
                    m_system.GetRandomVector(),
                    null!);
            }
            {
                VectorVariableState variable = FindTypeState<VectorVariableState>(
                    Variables.Data_Dynamic_Structure_VectorStructure)!;
                m_dataDynamicStructureVectorStructure = new VectorVariableValue(
                    variable,
                    m_system.GetRandomVector(),
                    null!);
            }
            {
                VectorVariableState variable = FindTypeState<VectorVariableState>(
                    Variables.Data_Static_Scalar_VectorValue)!;
                m_dataStaticVectorScalarValue = new VectorVariableValue(
                    variable,
                    m_system.GetRandomVector(),
                    null!);
            }
            {
                VectorVariableState variable = FindTypeState<VectorVariableState>(
                    Variables.Data_Dynamic_Scalar_VectorValue)!;
                m_dataDynamicVectorScalarValue = new VectorVariableValue(
                    variable,
                    m_system.GetRandomVector(),
                    null!);
            }
        }

        /// <summary>
        /// Loads a node set from a file or resource and adds them to the set of predefined nodes.
        /// </summary>
        protected override ValueTask<NodeStateCollection> LoadPredefinedNodesAsync(ISystemContext context,
            CancellationToken cancellationToken = default)
        {
            return new ValueTask<NodeStateCollection>(new NodeStateCollection().AddTestData(context));
        }

        /// <summary>
        /// Routes HistoryRead / HistoryUpdate dispatch to the in-memory
        /// historian owned by <see cref="TestDataSystem"/>. Without this
        /// override the dispatcher's resolution falls through to the
        /// server-wide registry — and TestData deliberately keeps its
        /// archive private so it does not compete with other node
        /// managers (e.g. ReferenceNodeManager) that may also register
        /// a default provider in the same process.
        /// </summary>
        protected override IHistorianProvider? GetHistorianProvider(NodeState node)
        {
            return m_system.Historian;
        }

        /// <summary>
        /// Replaces the generic node with a node specific to the model.
        /// </summary>
        protected override ValueTask<NodeState> AddBehaviourToPredefinedNodeAsync(
            ISystemContext context,
            NodeState predefinedNode,
            CancellationToken cancellationToken = default)
        {
            if (predefinedNode is BaseObjectState passiveNode)
            {
                NodeId typeId = passiveNode.TypeDefinitionId;

                if (!IsNodeIdInNamespace(typeId) || !typeId.TryGetValue(out uint typeIdNumeric))
                {
                    return new ValueTask<NodeState>(predefinedNode);
                }

                switch (typeIdNumeric)
                {
                    case ObjectTypes.TestSystemConditionType:
                    {
                        if (passiveNode is not TestSystemConditionState activeNode)
                        {
                            activeNode = new TestSystemConditionState(passiveNode.Parent);
                            activeNode.Create(context, passiveNode);

                            passiveNode.Parent?.ReplaceChild(context, activeNode);
                        }
                        return new ValueTask<NodeState>(activeNode);
                    }
                    case ObjectTypes.ScalarValueObjectType:
                    {
                        if (passiveNode is not ScalarValueObjectState activeNode)
                        {
                            activeNode = new ScalarValueObjectState(passiveNode.Parent);
                            activeNode.Create(context, passiveNode);

                            passiveNode.Parent?.ReplaceChild(context, activeNode);
                        }
                        return new ValueTask<NodeState>(activeNode);
                    }
                    case ObjectTypes.StructureValueObjectType:
                    {
                        if (passiveNode is not StructureValueObjectState activeNode)
                        {
                            activeNode = new StructureValueObjectState(passiveNode.Parent);
                            activeNode.Create(context, passiveNode);

                            passiveNode.Parent?.ReplaceChild(context, activeNode);
                        }
                        return new ValueTask<NodeState>(activeNode);
                    }
                    case ObjectTypes.AnalogScalarValueObjectType:
                    {
                        if (passiveNode is not AnalogScalarValueObjectState activeNode)
                        {
                            activeNode = new AnalogScalarValueObjectState(passiveNode.Parent);
                            activeNode.Create(context, passiveNode);

                            passiveNode.Parent?.ReplaceChild(context, activeNode);
                        }
                        return new ValueTask<NodeState>(activeNode);
                    }
                    case ObjectTypes.ArrayValueObjectType:
                    {
                        if (passiveNode is not ArrayValueObjectState activeNode)
                        {
                            activeNode = new ArrayValueObjectState(passiveNode.Parent);
                            activeNode.Create(context, passiveNode);

                            passiveNode.Parent?.ReplaceChild(context, activeNode);
                        }
                        return new ValueTask<NodeState>(activeNode);
                    }
                    case ObjectTypes.AnalogArrayValueObjectType:
                    {
                        if (passiveNode is not AnalogArrayValueObjectState activeNode)
                        {
                            activeNode = new AnalogArrayValueObjectState(passiveNode.Parent);
                            activeNode.Create(context, passiveNode);

                            passiveNode.Parent?.ReplaceChild(context, activeNode);
                        }
                        return new ValueTask<NodeState>(activeNode);
                    }
                    case ObjectTypes.UserScalarValueObjectType:
                    {
                        if (passiveNode is not UserScalarValueObjectState activeNode)
                        {
                            activeNode = new UserScalarValueObjectState(passiveNode.Parent);
                            activeNode.Create(context, passiveNode);

                            passiveNode.Parent?.ReplaceChild(context, activeNode);
                        }
                        return new ValueTask<NodeState>(activeNode);
                    }
                    case ObjectTypes.UserArrayValueObjectType:
                    {
                        if (passiveNode is not UserArrayValueObjectState activeNode)
                        {
                            activeNode = new UserArrayValueObjectState(passiveNode.Parent);
                            activeNode.Create(context, passiveNode);

                            passiveNode.Parent?.ReplaceChild(context, activeNode);
                        }
                        return new ValueTask<NodeState>(activeNode);
                    }
                    case ObjectTypes.MethodTestType:
                    {
                        if (passiveNode is not MethodTestState activeNode)
                        {
                            activeNode = new MethodTestState(passiveNode.Parent);
                            activeNode.Create(context, passiveNode);

                            passiveNode.Parent?.ReplaceChild(context, activeNode);
                        }
                        return new ValueTask<NodeState>(activeNode);
                    }
                }
            }
            else if (predefinedNode is BaseVariableState variableNode)
            {
                NodeId typeId = variableNode.TypeDefinitionId;

                if (!IsNodeIdInNamespace(typeId) || !typeId.TryGetValue(out uint typeIdNumeric))
                {
                    return new ValueTask<NodeState>(predefinedNode);
                }

                switch (typeIdNumeric)
                {
                    case VariableTypes.ScalarStructureVariableType:
                    {
                        if (variableNode is not ScalarStructureVariableState activeNode)
                        {
                            activeNode = new ScalarStructureVariableState(variableNode.Parent);
                            activeNode.Create(context, variableNode);

                            variableNode.Parent?.ReplaceChild(context, activeNode);
                        }
                        return new ValueTask<NodeState>(activeNode);
                    }
                    case VariableTypes.VectorVariableType:
                    {
                        if (variableNode is not VectorVariableState activeNode)
                        {
                            activeNode = new VectorVariableState(variableNode.Parent);
                            activeNode.Create(context, variableNode);

                            variableNode.Parent?.ReplaceChild(context, activeNode);
                        }
                        return new ValueTask<NodeState>(activeNode);
                    }
                }
            }
            return new ValueTask<NodeState>(predefinedNode);
        }

        /// <summary>
        /// Returns true if the system must be scanning to provide updates for the monitored item.
        /// </summary>
        private static bool SystemScanRequired(
            MonitoredNode2 monitoredNode,
            IDataChangeMonitoredItem2 monitoredItem)
        {
            // ingore other types of monitored items.
            if (monitoredItem == null)
            {
                return false;
            }

            // only care about variables and properties.
            if (monitoredNode.Node is not BaseVariableState source)
            {
                return false;
            }

            // check for variables that need to be scanned.
            if (monitoredItem.AttributeId == Attributes.Value)
            {
                if (source.Parent is TestDataObjectState test && test.SimulationActive!.Value)
                {
                    return true;
                }

                var sourcesource = source.Parent as BaseVariableState;
                if (sourcesource?.Parent is TestDataObjectState testtest &&
                    testtest.SimulationActive!.Value)
                {
                    return true;
                }
            }

            return false;
        }

        /// <summary>
        /// Called after creating a MonitoredItem.
        /// </summary>
        /// <param name="context">The context.</param>
        /// <param name="handle">The handle for the node.</param>
        /// <param name="monitoredItem">The monitored item.</param>
        protected override void OnMonitoredItemCreated(
            ServerSystemContext context,
            NodeHandle handle,
            ISampledDataChangeMonitoredItem monitoredItem)
        {
            if (SystemScanRequired(handle.MonitoredNode, monitoredItem) &&
                monitoredItem.MonitoringMode != MonitoringMode.Disabled &&
                handle.Node is BaseVariableState variable)
            {
                m_system.StartMonitoringValue(
                    monitoredItem.Id,
                    monitoredItem.SamplingInterval,
                    variable);
            }
        }

        /// <summary>
        /// Called after modifying a MonitoredItem.
        /// </summary>
        /// <param name="context">The context.</param>
        /// <param name="handle">The handle for the node.</param>
        /// <param name="monitoredItem">The monitored item.</param>
        protected override ValueTask OnMonitoredItemModifiedAsync(
            ServerSystemContext context,
            NodeHandle handle,
            ISampledDataChangeMonitoredItem monitoredItem,
            CancellationToken cancellationToken = default)
        {
            if (SystemScanRequired(handle.MonitoredNode, monitoredItem) &&
                monitoredItem.MonitoringMode != MonitoringMode.Disabled)
            {
                var source = handle.Node as BaseVariableState;
                m_system.StopMonitoringValue(monitoredItem.Id);
                m_system.StartMonitoringValue(
                    monitoredItem.Id,
                    monitoredItem.SamplingInterval,
                    source!);
            }

            return default;
        }

        /// <summary>
        /// Called after deleting a MonitoredItem.
        /// </summary>
        /// <param name="context">The context.</param>
        /// <param name="handle">The handle for the node.</param>
        /// <param name="monitoredItem">The monitored item.</param>
        protected override ValueTask OnMonitoredItemDeletedAsync(
            ServerSystemContext context,
            NodeHandle handle,
            ISampledDataChangeMonitoredItem monitoredItem,
            CancellationToken cancellationToken = default)
        {
            // check for variables that need to be scanned.
            if (SystemScanRequired(handle.MonitoredNode, monitoredItem))
            {
                m_system.StopMonitoringValue(monitoredItem.Id);
            }

            return default;
        }

        /// <summary>
        /// Called after changing the MonitoringMode for a MonitoredItem.
        /// </summary>
        /// <param name="context">The context.</param>
        /// <param name="handle">The handle for the node.</param>
        /// <param name="monitoredItem">The monitored item.</param>
        /// <param name="previousMode">The previous monitoring mode.</param>
        /// <param name="monitoringMode">The current monitoring mode.</param>
        protected override ValueTask OnMonitoringModeChangedAsync(
            ServerSystemContext context,
            NodeHandle handle,
            ISampledDataChangeMonitoredItem monitoredItem,
            MonitoringMode previousMode,
            MonitoringMode monitoringMode,
            CancellationToken cancellationToken = default)
        {
            if (SystemScanRequired(handle.MonitoredNode, monitoredItem))
            {
                var source = handle.Node as BaseVariableState;

                if (previousMode != MonitoringMode.Disabled &&
                    monitoredItem.MonitoringMode == MonitoringMode.Disabled)
                {
                    m_system.StopMonitoringValue(monitoredItem.Id);
                }

                if (previousMode == MonitoringMode.Disabled &&
                    monitoredItem.MonitoringMode != MonitoringMode.Disabled)
                {
                    m_system.StartMonitoringValue(
                        monitoredItem.Id,
                        monitoredItem.SamplingInterval,
                        source!);
                }
            }

            return default;
        }

        private TS? FindTypeState<TS>(uint nodeId)
            where TS : NodeState
        {
            var expandedNodeId = new ExpandedNodeId(nodeId, Namespaces.TestData);
            return FindPredefinedNode<TS>(
                ExpandedNodeId.ToNodeId(expandedNodeId, Server.NamespaceUris));
        }

#if CONDITION_SAMPLES
        /// <summary>
        /// Peridically checks the system state.
        /// </summary>
        private void OnCheckSystemStatus(object state)
        {
            lock (m_lock)
            {
                try
                {
                    // create the dialog.
                    if (m_dialog == null)
                    {
                        m_dialog = new DialogConditionState(null);

                        CreateNode(
                            SystemContext,
                            ExpandedNodeId.ToNodeId(ObjectIds.Data_Conditions, SystemContext.NamespaceUris),
                            ReferenceTypeIds.HasComponent,
                            new QualifiedName("ResetSystemDialog", m_namespaceIndex),
                            m_dialog);

                        m_dialog.OnAfterResponse = OnDialogComplete;
                    }

                    StatusCode systemStatus = m_system.SystemStatus;
                    m_systemStatusCondition.UpdateStatus(systemStatus);

                    // cycle through different status codes in order to simulate a real system.
                    if (StatusCode.IsGood(systemStatus))
                    {
                        m_systemStatusCondition.UpdateSeverity((ushort)EventSeverity.Low);
                        m_system.SystemStatus = StatusCodes.Uncertain;
                    }
                    else if (StatusCode.IsUncertain(systemStatus))
                    {
                        m_systemStatusCondition.UpdateSeverity((ushort)EventSeverity.Medium);
                        m_system.SystemStatus = StatusCodes.Bad;
                    }
                    else
                    {
                        m_systemStatusCondition.UpdateSeverity((ushort)EventSeverity.High);
                        m_system.SystemStatus = StatusCodes.Good;
                    }

                    // request a reset if status is bad.
                    if (StatusCode.IsBad(systemStatus))
                    {
                        m_dialog.RequestResponse(
                            SystemContext,
                            "Reset the test system?",
                            (uint)(int)(DialogConditionChoice.Ok | DialogConditionChoice.Cancel),
                            (ushort)EventSeverity.MediumHigh);
                    }

                    // report the event.
                    TranslationInfo info = new TranslationInfo(
                        "TestSystemStatusChange",
                        "en-US",
                        "The TestSystem status is now {0}.",
                        systemStatus);

                    m_systemStatusCondition.ReportConditionChange(SystemContext, null, new LocalizedText(info), false);
                }
                catch (Exception e)
                {
                    m_logger.LogError(e, "Unexpected error monitoring system status.");
                }
            }
        }

        /// <summary>
        /// Handles a user response to a dialog.
        /// </summary>
        private ServiceResult OnDialogComplete(
            ISystemContext context,
            DialogConditionState dialog,
            DialogConditionChoice response)
        {
            if (m_dialog != null)
            {
                DeleteNode(SystemContext, m_dialog.NodeId);
                m_dialog = null;
            }

            return ServiceResult.Good;
        }
#endif
        private readonly TestDataNodeManagerConfiguration m_configuration;
        private readonly Lock m_lock = new();
        private ushort m_namespaceIndex;
        private ushort m_typeNamespaceIndex;
        private readonly TestDataSystem m_system;
        private uint m_lastUsedId;
#if CONDITION_SAMPLES
        private Timer m_systemStatusTimer;
        private TestSystemConditionState m_systemStatusCondition;
        private DialogConditionState m_dialog;
#endif
        private ScalarStructureVariableValue? m_dataStaticStructureScalarStructure;
        private ScalarStructureVariableValue? m_dataDynamicStructureScalarStructure;
        private VectorVariableValue? m_dataStaticStructureVectorStructure;
        private VectorVariableValue? m_dataDynamicStructureVectorStructure;
        private VectorVariableValue? m_dataStaticVectorScalarValue;
        private VectorVariableValue? m_dataDynamicVectorScalarValue;
    }
}