/* ========================================================================
 * Copyright (c) 2005-2025 The OPC Foundation, Inc. All rights reserved.
 *
 * 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
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * The complete license agreement can be found here:
 * http://opcfoundation.org/License/MIT/1.00/
 * ======================================================================*/

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Opc.Ua.Security.Certificates;

namespace Opc.Ua.Client
{
    /// <summary>
    /// Manages a session with a server.
    /// </summary>
    public static class SessionObsolete
    {
        extension(ISession session)
        {
            /// <summary>
            /// Gets the TickCount in ms of the last keep alive based on
            /// <see cref="ISession.LastKeepAliveTimestamp"/>.
            /// </summary>
            [Obsolete("Use LastKeepAliveTimestamp + TimeProvider.GetElapsedTime. " +
                "LastKeepAliveTickCount is a 32-bit value that wraps every ~49.7 days.")]
            public int LastKeepAliveTickCount
                => unchecked((int)(session.LastKeepAliveTimestamp *
                    1000L / TimeProvider.System.TimestampFrequency));
        }

        /// <summary>
        /// Reconnects to the server after a network failure.
        /// </summary>
        [Obsolete("Use ReconnectAsync instead.")]
        public static void Reconnect(this ISession session)
        {
            session.ReconnectAsync().GetAwaiter().GetResult();
        }

        /// <summary>
        /// Reconnects to the server after a network failure using a waiting connection.
        /// </summary>
        [Obsolete("Use ReconnectAsync instead.")]
        public static void Reconnect(this ISession session, ITransportWaitingConnection connection)
        {
            session.ReconnectAsync(connection).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Reconnects to the server using a new channel.
        /// </summary>
        [Obsolete("Use ReconnectAsync instead.")]
        public static void Reconnect(this ISession session, ITransportChannel channel)
        {
            session.ReconnectAsync(channel).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Updates the local copy of the server's namespace uri and server uri tables.
        /// </summary>
        [Obsolete("Use FetchNamespaceTablesAsync instead.")]
        public static void FetchNamespaceTables(this ISession session)
        {
            session.FetchNamespaceTablesAsync().GetAwaiter().GetResult();
        }

        /// <summary>
        /// Updates the cache with the type and its subtypes.
        /// </summary>
        [Obsolete("Use FetchTypeTreeAsync instead.")]
        public static void FetchTypeTree(this ISession session, ExpandedNodeId typeId)
        {
            session.FetchTypeTreeAsync(typeId).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Updates the cache with the types and its subtypes.
        /// </summary>
        [Obsolete("Use FetchTypeTreeAsync instead.")]
        public static void FetchTypeTree(this ISession session, ArrayOf<ExpandedNodeId> typeIds)
        {
            session.FetchTypeTreeAsync(typeIds).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Returns the available encodings for a node
        /// </summary>
        [Obsolete("Use ReadAvailableEncodingsAsync instead.")]
        public static ArrayOf<ReferenceDescription> ReadAvailableEncodings(
            this ISession session,
            NodeId variableId)
        {
            return session.ReadAvailableEncodingsAsync(variableId).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Returns the data description for the encoding.
        /// </summary>
        [Obsolete("Use FindDataDescriptionAsync instead.")]
        public static ReferenceDescription FindDataDescription(
            this ISession session,
            NodeId encodingId)
        {
            return session.FindDataDescriptionAsync(encodingId).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Reads the values for the node attributes and returns a node object.
        /// </summary>
        [Obsolete("Use ReadNodeAsync instead.")]
        public static Node ReadNode(this ISession session, NodeId nodeId)
        {
            return session.ReadNodeAsync(nodeId).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Reads the values for the node attributes and returns a node object.
        /// </summary>
        [Obsolete("Use ReadNodeAsync instead.")]
        public static Node ReadNode(
            this ISession session,
            NodeId nodeId,
            NodeClass nodeClass,
            bool optionalAttributes = true)
        {
            return session.ReadNodeAsync(
                nodeId,
                nodeClass,
                optionalAttributes).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Reads the values for the node attributes and returns a node object.
        /// </summary>
        [Obsolete("Use ReadNodesAsync instead.")]
        public static void ReadNodes(
            this ISession session,
            ArrayOf<NodeId> nodeIds,
            out ArrayOf<Node> nodeCollection,
            out ArrayOf<ServiceResult> errors,
            bool optionalAttributes = false)
        {
            (nodeCollection, errors) = session.ReadNodesAsync(
                nodeIds,
                optionalAttributes).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Reads the values for the node attributes and returns a node object collection.
        /// </summary>
        /// <remarks>
        /// If the nodeclass for the nodes in nodeIdCollection is already known,
        /// and passed as nodeClass, reads only values of required attributes.
        /// Otherwise NodeClass.Unspecified should be used.
        /// </remarks>
        [Obsolete("Use ReadNodesAsync instead.")]
        public static void ReadNodes(
            this ISession session,
            ArrayOf<NodeId> nodeIds,
            NodeClass nodeClass,
            out ArrayOf<Node> nodeCollection,
            out ArrayOf<ServiceResult> errors,
            bool optionalAttributes = false)
        {
            (nodeCollection, errors) = session.ReadNodesAsync(
                nodeIds,
                nodeClass,
                optionalAttributes).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Reads the value for a node.
        /// </summary>
        [Obsolete("Use ReadValueAsync instead.")]
        public static DataValue ReadValue(this ISession session, NodeId nodeId)
        {
            return session.ReadValueAsync(nodeId).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Reads the values for a set of variables.
        /// </summary>
        [Obsolete("Use ReadValuesAsync returning Variant Array")]
        public static async ValueTask<(
            ArrayOf<object?>,
            ArrayOf<ServiceResult>
            )> ReadValuesAsync(
                this ISessionClient session,
                ArrayOf<NodeId> variableIds,
                ArrayOf<Type?> expectedTypes,
                CancellationToken ct = default)
        {
            (ArrayOf<DataValue> dataValues, ArrayOf<ServiceResult> errorValues) =
                await session.ReadValuesAsync(variableIds, ct).ConfigureAwait(false);

            var errors = new ServiceResult[errorValues.Count];
            object?[] values = new object?[dataValues.Count];
            for (int ii = 0; ii < variableIds.Count; ii++)
            {
                object? value = dataValues[ii].Value;

                // extract the body from extension objects.
                if (value is ExtensionObject extension &&
                    extension.TryGetValue(out IEncodeable? encodeable))
                {
                    value = encodeable;
                }

                // check expected type.
                Type? expectedType = expectedTypes[ii];
                if (expectedType != null &&
                    !expectedType.IsInstanceOfType(value))
                {
                    errors[ii] = ServiceResult.Create(
                        StatusCodes.BadTypeMismatch,
                        "Value {0} does not have expected type: {1}.",
                        value!,
                        expectedType.Name);
                    continue;
                }

                // suitable value found.
                errors[ii] = errorValues[ii];
                values[ii] = value;
            }
            return (values, errors);
        }

        /// <summary>
        /// Reads the value for a node an checks that it is the specified type.
        /// </summary>
        /// <exception cref="ServiceResultException"></exception>
        [Obsolete("Use ReadValueAsync instead.")]
        public static object? ReadValue(this ISession session, NodeId nodeId, Type? expectedType)
        {
            DataValue dataValue = session.ReadValueAsync(nodeId).GetAwaiter().GetResult();
            object? value = dataValue.Value;

            if (expectedType != null)
            {
                if (dataValue.WrappedValue.TryGetValue(out ExtensionObject extension) &&
                    extension.TryGetValue(out IEncodeable? encodeable))
                {
                    value = encodeable;
                }

                if (!expectedType.IsInstanceOfType(value))
                {
                    throw ServiceResultException.Create(
                        StatusCodes.BadTypeMismatch,
                        "Server returned value unexpected type: {0}",
                        value != null ? value.GetType().Name : "(null)");
                }
            }
            return value;
        }

        /// <summary>
        /// Reads the values for a node collection. Returns diagnostic errors.
        /// </summary>
        [Obsolete("Use ReadValuesAsync instead.")]
        public static void ReadValues(
            this ISession session,
            ArrayOf<NodeId> nodeIds,
            out ArrayOf<DataValue> values,
            out ArrayOf<ServiceResult> errors)
        {
            (values, errors) = session.ReadValuesAsync(
                nodeIds).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Reads a byte string which is too large for the (server side) encoder to handle.
        /// </summary>
        /// <returns></returns>
        [Obsolete("Use ReadByteStringInChunksAsync instead.")]
        public static ByteString ReadByteStringInChunks(
            this ISession session,
            NodeId nodeId)
        {
            return session.ReadByteStringInChunksAsync(nodeId).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Fetches all references for the specified node.
        /// </summary>
        [Obsolete("Use FetchReferencesAsync instead.")]
        public static ArrayOf<ReferenceDescription> FetchReferences(
            this ISession session,
            NodeId nodeId)
        {
            return session.FetchReferencesAsync(nodeId).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Fetches all references for the specified nodes.
        /// </summary>
        [Obsolete("Use FetchReferencesAsync instead.")]
        public static void FetchReferences(
            this ISession session,
            ArrayOf<NodeId> nodeIds,
            out ArrayOf<ArrayOf<ReferenceDescription>> referenceDescriptions,
            out ArrayOf<ServiceResult> errors)
        {
            (referenceDescriptions, errors) = session.FetchReferencesAsync(
                nodeIds).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Establishes a session with the server.
        /// </summary>
        [Obsolete("Use OpenAsync instead.")]
        public static void Open(
            this ISession session,
            string sessionName,
            IUserIdentity identity)
        {
            session.OpenAsync(sessionName, identity).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Establishes a session with the server.
        /// </summary>
        [Obsolete("Use OpenAsync instead.")]
        public static void Open(
            this ISession session,
            string sessionName,
            uint sessionTimeout,
            IUserIdentity identity,
            ArrayOf<string> preferredLocales)
        {
            session.OpenAsync(
                sessionName,
                sessionTimeout,
                identity,
                preferredLocales).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Establishes a session with the server.
        /// </summary>
        [Obsolete("Use OpenAsync instead.")]
        public static void Open(
            this ISession session,
            string sessionName,
            uint sessionTimeout,
            IUserIdentity identity,
            ArrayOf<string> preferredLocales,
            bool checkDomain)
        {
            session.OpenAsync(
                sessionName,
                sessionTimeout,
                identity,
                preferredLocales,
                checkDomain).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Establishes a session with the server.
        /// </summary>
        [Obsolete("Use OpenAsync instead.")]
        public static void Open(
            this ISession session,
            string sessionName,
            uint sessionTimeout,
            IUserIdentity identity,
            ArrayOf<string> preferredLocales,
            bool checkDomain,
            bool closeChannel)
        {
            session.OpenAsync(
                sessionName,
                sessionTimeout,
                identity,
                preferredLocales,
                checkDomain,
                closeChannel).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Updates the preferred locales used for the session.
        /// </summary>
        [Obsolete("Use ChangePreferredLocalesAsync instead.")]
        public static void ChangePreferredLocales(
            this ISession session,
            ArrayOf<string> preferredLocales)
        {
            session.ChangePreferredLocalesAsync(preferredLocales)
                .GetAwaiter()
                .GetResult();
        }

        /// <summary>
        /// Updates the user identity and/or locales used for the session.
        /// </summary>
        [Obsolete("Use UpdateSessionAsync instead.")]
        public static void UpdateSession(
            this ISession session,
            IUserIdentity identity,
            ArrayOf<string> preferredLocales)
        {
            session.UpdateSessionAsync(identity, preferredLocales)
                .GetAwaiter()
                .GetResult();
        }

        /// <summary>
        /// Finds the NodeIds for the components for an instance.
        /// </summary>
        [Obsolete("Use FindComponentIdsAsync instead.")]
        public static void FindComponentIds(this ISession session,
            NodeId instanceId,
            IList<string> componentPaths,
            out ArrayOf<NodeId> componentIds,
            out ArrayOf<ServiceResult> errors)
        {
            (componentIds, errors) = session.FindComponentIdsAsync(
                instanceId,
                componentPaths)
                .GetAwaiter()
                .GetResult();
        }

        /// <summary>
        /// Reads the values for a set of variables.
        /// </summary>
        [Obsolete("Use Use ReadValuesAsync instead.")]
        public static void ReadValues(this ISession session,
            ArrayOf<NodeId> variableIds,
            ArrayOf<Type?> expectedTypes,
            out ArrayOf<object?> values,
            out ArrayOf<ServiceResult> errors)
        {
            (ArrayOf<DataValue> dataValues, ArrayOf<ServiceResult> errorValues) = session.ReadValuesAsync(
                variableIds)
                .GetAwaiter()
                .GetResult();

            object?[] valuesBuffer = new object?[dataValues.Count];
            var errorsBuffer = new ServiceResult[errorValues.Count];
            for (int ii = 0; ii < variableIds.Count; ii++)
            {
                object? value = dataValues[ii].Value;

                // extract the body from extension objects.
                if (dataValues[ii].WrappedValue.TryGetValue(out ExtensionObject extension) &&
                    extension.TryGetValue(out IEncodeable? encodeable))
                {
                    value = encodeable;
                }

                // check expected type.
                Type? expectedType = expectedTypes[ii];
                if (expectedType != null &&
                    !expectedType.IsInstanceOfType(value))
                {
                    errorsBuffer[ii] = ServiceResult.Create(
                        StatusCodes.BadTypeMismatch,
                        "Value {0} does not have expected type: {1}.",
                        value!,
                        expectedType.Name);

                    continue;
                }

                // suitable value found.
                valuesBuffer[ii] = value;
                errorsBuffer[ii] = errorValues[ii];
            }

            values = valuesBuffer;
            errors = errorsBuffer;
        }

        /// <summary>
        /// Reads the display name for a set of Nodes.
        /// </summary>
        [Obsolete("Use Use ReadValuesAsync instead.")]
        public static void ReadDisplayName(this ISession session,
            ArrayOf<NodeId> nodeIds,
            out ArrayOf<string> displayNames,
            out ArrayOf<ServiceResult> errors)
        {
            (displayNames, errors) = session.ReadDisplayNameAsync(nodeIds)
                .GetAwaiter()
                .GetResult();
        }

        /// <summary>
        /// Closes the client object and the underlying channel.
        /// </summary>
        [Obsolete("Use CloseAsync instead.")]
        public static StatusCode Close(this IClientBase client)
        {
            return client.CloseAsync().GetAwaiter().GetResult();
        }

        /// <summary>
        /// Disconnects from the server and frees any network resources
        /// with the specified timeout.
        /// </summary>
        [Obsolete("Use CloseAsync instead.")]
        public static StatusCode Close(this ISession session, int timeout)
        {
            return session.CloseAsync(timeout).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Close the session with the server and optionally closes the channel.
        /// </summary>
        [Obsolete("Use CloseAsync instead.")]
        public static StatusCode Close(this ISession session, bool closeChannel)
        {
            return session.CloseAsync(closeChannel)
                .GetAwaiter()
                .GetResult();
        }

        /// <summary>
        /// Disconnects from the server and frees any network resources
        /// with the specified timeout.
        /// </summary>
        [Obsolete("Use CloseAsync instead.")]
        public static StatusCode Close(
            this ISession session,
            int timeout,
            bool closeChannel)
        {
            return session.CloseAsync(timeout, closeChannel)
                .GetAwaiter()
                .GetResult();
        }

        /// <summary>
        /// Removes a subscription from the session.
        /// </summary>
        [Obsolete("Use RemoveSubscriptionAsync instead.")]
        public static bool RemoveSubscription(
            this ISession session,
            Subscription subscription)
        {
            return session.RemoveSubscriptionAsync(subscription)
                .GetAwaiter()
                .GetResult();
        }

        /// <summary>
        /// Remove a list of subscriptions from the session.
        /// </summary>
        [Obsolete("Use RemoveSubscriptionsAsync instead.")]
        public static bool RemoveSubscriptions(
            this ISession session,
            IEnumerable<Subscription> subscriptions)
        {
            return session.RemoveSubscriptionsAsync(subscriptions)
                .GetAwaiter()
                .GetResult();
        }

        /// <summary>
        /// Reactivates a list of subscriptions loaded from storage.
        /// </summary>
        [Obsolete("Use ReactivateSubscriptionsAsync instead.")]
        public static bool ReactivateSubscriptions(
            this ISession session,
            SubscriptionCollection subscriptions,
            bool sendInitialValues)
        {
            return session.ReactivateSubscriptionsAsync(
                subscriptions,
                sendInitialValues)
                .GetAwaiter()
                .GetResult();
        }

        /// <summary>
        /// Transfers a list of subscriptions from another session.
        /// </summary>
        [Obsolete("Use TransferSubscriptionsAsync instead.")]
        public static bool TransferSubscriptions(
            this ISession session,
            SubscriptionCollection subscriptions,
            bool sendInitialValues)
        {
            return session.TransferSubscriptionsAsync(
                subscriptions,
                sendInitialValues).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Invokes the Browse service.
        /// </summary>
        /// <exception cref="ServiceResultException"></exception>
        [Obsolete("Use BrowseAsync instead.")]
        public static ResponseHeader Browse(
            this ISession session,
            RequestHeader requestHeader,
            ViewDescription view,
            NodeId nodeToBrowse,
            uint maxResultsToReturn,
            BrowseDirection browseDirection,
            NodeId referenceTypeId,
            bool includeSubtypes,
            uint nodeClassMask,
            out ByteString continuationPoint,
            out ArrayOf<ReferenceDescription> references)
        {
            (
                ResponseHeader responseHeader,
                ArrayOf<ByteString> continuationPoints,
                ArrayOf<ArrayOf<ReferenceDescription>> referencesList,
                ArrayOf<ServiceResult> errors
            ) =
                session.BrowseAsync(
                    requestHeader,
                    view,
                    [nodeToBrowse],
                    maxResultsToReturn,
                    browseDirection,
                    referenceTypeId,
                    includeSubtypes,
                    nodeClassMask)
                    .GetAwaiter()
                    .GetResult();

            Debug.Assert(errors.Count <= 1);
            if (errors.Count > 0 && StatusCode.IsBad(errors[0].StatusCode))
            {
                throw new ServiceResultException(errors[0]);
            }

            Debug.Assert(referencesList.Count == 1);
            Debug.Assert(continuationPoints.Count == 1);
            references = referencesList[0];
            continuationPoint = continuationPoints[0];
            return responseHeader;
        }

        /// <summary>
        /// Invokes the BrowseNext service.
        /// </summary>
        /// <exception cref="ServiceResultException"></exception>
        [Obsolete("Use BrowseNextAsync instead.")]
        public static ResponseHeader BrowseNext(
            this ISession session,
            RequestHeader requestHeader,
            bool releaseContinuationPoint,
            ByteString continuationPoint,
            out ByteString revisedContinuationPoint,
            out ArrayOf<ReferenceDescription> references)
        {
            (
                ResponseHeader responseHeader,
                ArrayOf<ByteString> revisedContinuationPoints,
                ArrayOf<ArrayOf<ReferenceDescription>> referencesList,
                ArrayOf<ServiceResult> errors
            ) =
                session.BrowseNextAsync(
                    requestHeader,
                    [continuationPoint],
                    releaseContinuationPoint)
                    .GetAwaiter()
                    .GetResult();
            Debug.Assert(errors.Count <= 1);
            if (errors.Count > 0 && StatusCode.IsBad(errors[0].StatusCode))
            {
                throw new ServiceResultException(errors[0]);
            }

            Debug.Assert(referencesList.Count == 1);
            Debug.Assert(revisedContinuationPoints.Count == 1);
            references = referencesList[0];
            revisedContinuationPoint = revisedContinuationPoints[0];
            return responseHeader;
        }

        /// <summary>
        /// Execute browse and, if necessary, browse next in one service call.
        /// Takes care of BadNoContinuationPoint and BadInvalidContinuationPoint status codes.
        /// </summary>
        [Obsolete("Use ManagedBrowseAsync instead.")]
        public static void ManagedBrowse(
            this ISession session,
            RequestHeader requestHeader,
            ViewDescription view,
            ArrayOf<NodeId> nodesToBrowse,
            uint maxResultsToReturn,
            BrowseDirection browseDirection,
            NodeId referenceTypeId,
            bool includeSubtypes,
            uint nodeClassMask,
            out ArrayOf<ArrayOf<ReferenceDescription>> result,
            out ArrayOf<ServiceResult> errors)
        {
            (result, errors) = session.ManagedBrowseAsync(
                requestHeader,
                view,
                nodesToBrowse,
                maxResultsToReturn,
                browseDirection,
                referenceTypeId,
                includeSubtypes,
                nodeClassMask)
                .GetAwaiter()
                .GetResult();
        }

        /// <summary>
        /// Calls the specified method and returns the output arguments.
        /// </summary>
        [Obsolete("Use CallAsync instead.")]
        public static ArrayOf<Variant> Call(
            this ISession session,
            NodeId objectId,
            NodeId methodId,
            params Variant[] args)
        {
            return session.CallAsync(
                objectId,
                methodId,
                default,
                args)
                .GetAwaiter()
                .GetResult();
        }

        /// <summary>
        /// Sends a republish request.
        /// </summary>
        [Obsolete("Use RepublishAsync instead.")]
        public static bool Republish(
            this ISession session,
            uint subscriptionId,
            uint sequenceNumber,
            out ServiceResult error)
        {
            (bool result, error) = session.RepublishAsync(
                subscriptionId,
                sequenceNumber)
                .GetAwaiter()
                .GetResult();
            return result;
        }

        /// <summary>
        /// Call the ResendData method on the server for all subscriptions.
        /// </summary>
        [Obsolete("Use ResendDataAsync instead.")]
        public static bool ResendData(
            this ISession session,
            IEnumerable<Subscription> subscriptions,
            out ArrayOf<ServiceResult> errors)
        {
            (bool success, errors) = session.ResendDataAsync(subscriptions)
                .GetAwaiter()
                .GetResult();
            return success;
        }

        /// <summary>
        /// Call the ResendData method on the server for all subscriptions.
        /// </summary>
        [Obsolete("Use ResendDataAsync using subscription ids instead.")]
        public static async Task<(bool, ArrayOf<ServiceResult>)> ResendDataAsync(
            this ISession session,
            IEnumerable<Subscription> subscriptions,
            CancellationToken ct = default)
        {
            try
            {
                ArrayOf<ServiceResult> errorsRo = await session.ResendDataAsync(
                    subscriptions.Select(s => s.Id).ToArrayOf(), ct).ConfigureAwait(false);
                return (true, errorsRo);
            }
            catch
            {
                return (false, Array.Empty<ServiceResult>());
            }
        }

        // ----------------------------------------------------------------
        // The following static factory helpers were originally declared as
        // `public partial class Session` members on the Session type in
        // Libraries/Opc.Ua.Client. Cross-assembly partial classes are not
        // supported, so when migrated into this shim assembly they are
        // hosted as static methods on SessionObsolete. Callers that
        // previously invoked `Session.Create(...)` / `Session.Recreate(...)`
        // must now call `SessionObsolete.Create(...)` / `SessionObsolete.Recreate(...)`.
        // ----------------------------------------------------------------

        /// <summary>
        /// Creates a new communication session with a server by invoking the CreateSession service
        /// </summary>
        [Obsolete("Use ISessionFactory.CreateAsync")]
        public static Task<Session> Create(
            ApplicationConfiguration configuration,
            ConfiguredEndpoint endpoint,
            bool updateBeforeConnect,
            string sessionName,
            uint sessionTimeout,
            IUserIdentity identity,
            ArrayOf<string> preferredLocales,
            CancellationToken ct = default)
        {
            return Create(
                configuration,
                endpoint,
                updateBeforeConnect,
                false,
                sessionName,
                sessionTimeout,
                identity,
                preferredLocales,
                ct);
        }

        /// <summary>
        /// Creates a new communication session with a server by invoking the CreateSession service
        /// </summary>
        [Obsolete("Use ISessionFactory.CreateAsync")]
        public static Task<Session> Create(
            ApplicationConfiguration configuration,
            ConfiguredEndpoint endpoint,
            bool updateBeforeConnect,
            bool checkDomain,
            string sessionName,
            uint sessionTimeout,
            IUserIdentity identity,
            ArrayOf<string> preferredLocales,
            CancellationToken ct = default)
        {
            return Create(
                configuration,
                // No reverse-connect transport in this overload; the modern API requires
                // a non-nullable parameter so this obsolete bridge forwards null!.
                (ITransportWaitingConnection)null!,
                endpoint,
                updateBeforeConnect,
                checkDomain,
                sessionName,
                sessionTimeout,
                identity,
                preferredLocales,
                ct);
        }

        /// <summary>
        /// Creates a new session with a server using the specified channel
        /// </summary>
        [Obsolete("Use ISessionFactory.CreateAsync")]
        public static Session Create(
            ApplicationConfiguration configuration,
            ITransportChannel channel,
            ConfiguredEndpoint endpoint,
            Certificate clientCertificate,
            ArrayOf<EndpointDescription> availableEndpoints = default,
            ArrayOf<string> discoveryProfileUris = default)
        {
            return Create(
                // Telemetry context is nullable on this obsolete bridge but required by the
                // modern API; null! preserves the pre-nullable lookup behavior.
                null!,
                configuration,
                channel,
                endpoint,
                clientCertificate,
                availableEndpoints,
                discoveryProfileUris);
        }

        /// <summary>
        /// Recreates a session based on a specified template.
        /// </summary>
        /// <param name="template">The Session object to use as template</param>
        /// <returns>The new session object.</returns>
        [Obsolete("Use ISessionFactory.RecreateAsync")]
        public static Session Recreate(Session template)
        {
            return RecreateAsync(template).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Recreates a session based on a specified template.
        /// </summary>
        /// <param name="template">The Session object to use as template</param>
        /// <param name="connection">The waiting reverse connection.</param>
        /// <returns>The new session object.</returns>
        [Obsolete("Use ISessionFactory.RecreateAsync")]
        public static Session Recreate(Session template, ITransportWaitingConnection connection)
        {
            return RecreateAsync(template, connection).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Recreates a session based on a specified template using the provided channel.
        /// </summary>
        /// <param name="template">The Session object to use as template</param>
        /// <param name="transportChannel">The waiting reverse connection.</param>
        /// <returns>The new session object.</returns>
        [Obsolete("Use ISessionFactory.RecreateAsync")]
        public static Session Recreate(Session template, ITransportChannel transportChannel)
        {
            return RecreateAsync(template, transportChannel).GetAwaiter().GetResult();
        }

        /// <summary>
        /// Recreates a session based on a specified template.
        /// </summary>
        [Obsolete("Use ISessionFactory.RecreateAsync")]
        public static async Task<Session> RecreateAsync(
            Session sessionTemplate,
            CancellationToken ct = default)
        {
            var factory = new DefaultSessionFactory(sessionTemplate.MessageContext.Telemetry)
            {
                ReturnDiagnostics = sessionTemplate.ReturnDiagnostics
            };
            return (Session)await factory.RecreateAsync(
                sessionTemplate,
                ct).ConfigureAwait(false);
        }

        /// <summary>
        /// Recreates a session based on a specified template.
        /// </summary>
        [Obsolete("Use ISessionFactory.RecreateAsync")]
        public static async Task<Session> RecreateAsync(
            Session sessionTemplate,
            ITransportWaitingConnection connection,
            CancellationToken ct = default)
        {
            var factory = new DefaultSessionFactory(sessionTemplate.MessageContext.Telemetry)
            {
                ReturnDiagnostics = sessionTemplate.ReturnDiagnostics
            };
            return (Session)await factory.RecreateAsync(
                sessionTemplate,
                connection,
                ct).ConfigureAwait(false);
        }

        /// <summary>
        /// Recreates a session based on a specified template using the provided channel.
        /// </summary>
        [Obsolete("Use ISessionFactory.RecreateAsync")]
        public static async Task<Session> RecreateAsync(
            Session sessionTemplate,
            ITransportChannel transportChannel,
            CancellationToken ct = default)
        {
            var factory = new DefaultSessionFactory(sessionTemplate.MessageContext.Telemetry)
            {
                ReturnDiagnostics = sessionTemplate.ReturnDiagnostics
            };
            return (Session)await factory.RecreateAsync(
                sessionTemplate,
                transportChannel,
                ct).ConfigureAwait(false);
        }

        /// <summary>
        /// Creates a new communication session with a server using a reverse connection.
        /// </summary>
        [Obsolete("Use ISessionFactory.CreateAsync")]
        public static Task<Session> Create(
            ApplicationConfiguration configuration,
            ITransportWaitingConnection connection,
            ConfiguredEndpoint endpoint,
            bool updateBeforeConnect,
            bool checkDomain,
            string sessionName,
            uint sessionTimeout,
            IUserIdentity identity,
            ArrayOf<string> preferredLocales,
            CancellationToken ct = default)
        {
            return CreateAsync(
                // Telemetry context is nullable on this obsolete bridge but required by the
                // modern API; null! preserves the pre-nullable lookup behavior.
                null!,
                configuration,
                connection,
                endpoint,
                updateBeforeConnect,
                checkDomain,
                sessionName,
                sessionTimeout,
                identity,
                preferredLocales,
                DiagnosticsMasks.None,
                ct);
        }

        /// <summary>
        /// Create a session
        /// </summary>
        [Obsolete("Use ISessionFactory.CreateAsync")]
        public static Task<Session> Create(
            ISessionInstantiator sessionInstantiator,
            ApplicationConfiguration configuration,
            ITransportWaitingConnection connection,
            ConfiguredEndpoint endpoint,
            bool updateBeforeConnect,
            bool checkDomain,
            string sessionName,
            uint sessionTimeout,
            IUserIdentity identity,
            ArrayOf<string> preferredLocales,
            CancellationToken ct = default)
        {
            return CreateAsync(
                sessionInstantiator,
                configuration,
                connection,
                endpoint,
                updateBeforeConnect,
                checkDomain,
                sessionName,
                sessionTimeout,
                identity,
                preferredLocales,
                DiagnosticsMasks.None,
                ct);
        }

        /// <summary>
        /// Create a session
        /// </summary>
        [Obsolete("Use ISessionFactory.CreateAsync")]
        public static Task<Session> Create(
            ISessionInstantiator sessionInstantiator,
            ApplicationConfiguration configuration,
            ReverseConnectManager reverseConnectManager,
            ConfiguredEndpoint endpoint,
            bool updateBeforeConnect,
            bool checkDomain,
            string sessionName,
            uint sessionTimeout,
            IUserIdentity userIdentity,
            ArrayOf<string> preferredLocales,
            CancellationToken ct = default)
        {
            return CreateAsync(
                sessionInstantiator,
                configuration,
                reverseConnectManager,
                endpoint,
                updateBeforeConnect,
                checkDomain,
                sessionName,
                sessionTimeout,
                userIdentity,
                preferredLocales,
                DiagnosticsMasks.None,
                ct);
        }

        /// <summary>
        /// Create a session
        /// </summary>
        [Obsolete("Use ISessionFactory.CreateAsync")]
        public static Task<Session> Create(
            ApplicationConfiguration configuration,
            ReverseConnectManager reverseConnectManager,
            ConfiguredEndpoint endpoint,
            bool updateBeforeConnect,
            bool checkDomain,
            string sessionName,
            uint sessionTimeout,
            IUserIdentity userIdentity,
            ArrayOf<string> preferredLocales,
            CancellationToken ct = default)
        {
            return CreateAsync(
                configuration,
                reverseConnectManager,
                endpoint,
                updateBeforeConnect,
                checkDomain,
                sessionName,
                sessionTimeout,
                userIdentity,
                preferredLocales,
                ct);
        }

        /// <summary>
        /// Creates a new session.
        /// </summary>
        [Obsolete("Use ISessionFactory.Create")]
        public static Session Create(
            ISessionInstantiator sessionInstantiator,
            ApplicationConfiguration configuration,
            ITransportChannel channel,
            ConfiguredEndpoint endpoint,
            Certificate clientCertificate,
            ArrayOf<EndpointDescription> availableEndpoints = default,
            ArrayOf<string> discoveryProfileUris = default)
        {
            ServiceMessageContext context = configuration.CreateMessageContext(false);
            var factory = new DefaultSessionFactory(context.Telemetry);
            return (Session)factory.Create(
                channel,
                configuration,
                endpoint,
                clientCertificate,
                null,
                availableEndpoints,
                discoveryProfileUris);
        }

        /// <summary>
        /// Creates a secure channel to the specified endpoint.
        /// </summary>
        [Obsolete("Use ISessionFactory.CreateChannelAsync")]
        public static Task<ITransportChannel> CreateChannelAsync(
            ApplicationConfiguration configuration,
            ITransportWaitingConnection connection,
            ConfiguredEndpoint endpoint,
            bool updateBeforeConnect,
            bool checkDomain,
            CancellationToken ct = default)
        {
            ServiceMessageContext context = configuration.CreateMessageContext(false);
            var factory = new DefaultSessionFactory(context.Telemetry);
            return factory.CreateChannelAsync(
                configuration,
                connection,
                endpoint,
                updateBeforeConnect,
                checkDomain,
                ct);
        }

        /// <summary>
        /// Creates a new communication session with a server using a reverse connection.
        /// </summary>
        [Obsolete("Use ISessionFactory.CreateAsync")]
        public static async Task<Session> CreateAsync(
            ISessionInstantiator sessionInstantiator,
            ApplicationConfiguration configuration,
            ITransportWaitingConnection connection,
            ConfiguredEndpoint endpoint,
            bool updateBeforeConnect,
            bool checkDomain,
            string sessionName,
            uint sessionTimeout,
            IUserIdentity identity,
            ArrayOf<string> preferredLocales,
            DiagnosticsMasks returnDiagnostics,
            CancellationToken ct = default)
        {
            ServiceMessageContext context = configuration.CreateMessageContext(false);
            var factory = new DefaultSessionFactory(context.Telemetry)
            {
                ReturnDiagnostics = returnDiagnostics
            };
            return (Session)await factory.CreateAsync(
                configuration,
                connection,
                endpoint,
                updateBeforeConnect,
                checkDomain,
                sessionName,
                sessionTimeout,
                identity,
                preferredLocales,
                ct).ConfigureAwait(false);
        }

        /// <summary>
        /// Creates a new communication session with a server using a reverse connect manager.
        /// </summary>
        [Obsolete("Use ISessionFactory.CreateAsync")]
        public static async Task<Session> CreateAsync(
            ApplicationConfiguration configuration,
            ReverseConnectManager reverseConnectManager,
            ConfiguredEndpoint endpoint,
            bool updateBeforeConnect,
            bool checkDomain,
            string sessionName,
            uint sessionTimeout,
            IUserIdentity userIdentity,
            ArrayOf<string> preferredLocales,
            CancellationToken ct = default)
        {
            ServiceMessageContext context = configuration.CreateMessageContext(false);
            var factory = new DefaultSessionFactory(context.Telemetry);
            return (Session)await factory.CreateAsync(
                configuration,
                reverseConnectManager,
                endpoint,
                updateBeforeConnect,
                checkDomain,
                sessionName,
                sessionTimeout,
                userIdentity,
                preferredLocales,
                ct).ConfigureAwait(false);
        }

        /// <summary>
        /// Creates a new communication session with a server using a reverse connect manager.
        /// </summary>
        [Obsolete("Use ISessionFactory.CreateAsync")]
        public static async Task<Session> CreateAsync(
            ISessionInstantiator sessionInstantiator,
            ApplicationConfiguration configuration,
            ReverseConnectManager reverseConnectManager,
            ConfiguredEndpoint endpoint,
            bool updateBeforeConnect,
            bool checkDomain,
            string sessionName,
            uint sessionTimeout,
            IUserIdentity userIdentity,
            ArrayOf<string> preferredLocales,
            DiagnosticsMasks returnDiagnostics,
            CancellationToken ct = default)
        {
            ServiceMessageContext context = configuration.CreateMessageContext(false);
            var factory = new DefaultSessionFactory(context.Telemetry)
            {
                ReturnDiagnostics = returnDiagnostics
            };
            return (Session)await factory.CreateAsync(
                configuration,
                reverseConnectManager,
                endpoint,
                updateBeforeConnect,
                checkDomain,
                sessionName,
                sessionTimeout,
                userIdentity,
                preferredLocales,
                ct).ConfigureAwait(false);
        }
    }

    /// <summary>
    /// Obsolete traceable session, which now is supported by session
    /// </summary>
    [Obsolete("Use Session which also provides tracing")]
    public class TraceableSession : Session
    {
        /// <summary>
        /// Create session
        /// </summary>
        public TraceableSession(
            ISessionChannel channel,
            ApplicationConfiguration configuration,
            ConfiguredEndpoint endpoint)
            : base(channel, configuration, endpoint)
        {
        }

        /// <summary>
        /// Create session
        /// </summary>
        public TraceableSession(
            ITransportChannel channel,
            Session template,
            bool copyEventHandlers)
            : base(channel, template, copyEventHandlers)
        {
        }

        /// <summary>
        /// Create session
        /// </summary>
        public TraceableSession(
            ITransportChannel channel,
            ApplicationConfiguration configuration,
            ConfiguredEndpoint endpoint,
            Certificate clientCertificate,
            ArrayOf<EndpointDescription> availableEndpoints = default,
            ArrayOf<string> discoveryProfileUris = default)
            : base(
                  channel,
                  configuration,
                  endpoint,
                  clientCertificate,
                  null,
                  availableEndpoints,
                  discoveryProfileUris)
        {
        }

        /// <summary>
        /// Object that creates instances of a session
        /// </summary>
        [Obsolete("Use DefaultSessionFactory which also provides tracing capabilities.")]
        public class TraceableSessionFactory : DefaultSessionFactory
        {
            /// <summary>
            /// The default instance of the factory.
            /// </summary>
            public static new readonly TraceableSessionFactory Instance = new();

            /// <summary>
            /// Obsolete default constructor
            /// </summary>
            public TraceableSessionFactory()
                // Telemetry is required by the base ctor; this obsolete parameterless ctor
                // forwards null! to preserve the pre-nullable instantiation pattern.
                : base(null!)
            {
            }
        }
    }

    /// <summary>
    /// Object that creates an instance of a Session object.
    /// </summary>
    [Obsolete("Use ISessionFactory instead. This interface will be removed in a future release.")]
    public interface ISessionInstantiator : ISessionFactory;

    /// <summary>
    /// Obsolete session factory api
    /// </summary>
    public static class SessionFactoryObsolete
    {
        /// <summary>
        /// Create session
        /// </summary>
        [Obsolete("Use Create with channel and configuration reversed")]
        public static ISession Create(
            this ISessionFactory factory,
            ApplicationConfiguration configuration,
            ITransportChannel channel,
            ConfiguredEndpoint endpoint,
            Certificate clientCertificate,
            ArrayOf<EndpointDescription> availableEndpoints = default,
            ArrayOf<string> discoveryProfileUris = default)
        {
            return factory.Create(
                channel,
                configuration,
                endpoint,
                clientCertificate,
                null,
                availableEndpoints,
                discoveryProfileUris);
        }
    }
}