/* ========================================================================
 * 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;

namespace Opc.Ua.Server.AliasNames.PubSub
{
    /// <summary>
    /// Default <see cref="IPortableNodeIdResolver"/> backed by an
    /// <see cref="IServerInternal"/>'s
    /// <see cref="IServerInternal.NamespaceUris"/> and
    /// <see cref="IServerInternal.ServerUris"/> tables. The current
    /// server's URI (index 0 of <c>ServerUris</c>) is stamped into
    /// every <see cref="PortableNodeId"/>; subscribers use this to
    /// filter messages by originating publisher.
    /// </summary>
    public sealed class ServerPortableNodeIdResolver : IPortableNodeIdResolver
    {
        /// <summary>
        /// Initializes a new resolver bound to the supplied server.
        /// </summary>
        /// <param name="server">The server whose namespace + server URI
        /// tables the resolver should use.</param>
        public ServerPortableNodeIdResolver(IServerInternal server)
        {
            m_server = server ?? throw new ArgumentNullException(nameof(server));
        }

        /// <inheritdoc/>
        public PortableNodeId? ToPortable(NodeId nodeId)
        {
            if (nodeId.IsNull)
            {
                return null;
            }

            string? namespaceUri = m_server.NamespaceUris.GetString(nodeId.NamespaceIndex);
            if (namespaceUri == null)
            {
                return null;
            }

            // The PortableNodeId Identifier field carries the local
            // NodeId stripped of its namespace index — the URI conveys
            // the namespace explicitly so the index is meaningless to a
            // subscriber.
            NodeId stripped = NodeId.Null;
            if (nodeId.TryGetValue(out uint numeric))
            {
                stripped = new NodeId(numeric);
            }
            else if (nodeId.TryGetValue(out string strValue) && strValue != null)
            {
                stripped = NodeId.Parse("s=" + strValue);
            }
            else if (nodeId.TryGetValue(out Guid guidValue))
            {
                stripped = new NodeId(guidValue);
            }
            else if (nodeId.TryGetValue(out ByteString opaque) && !opaque.IsNull)
            {
                stripped = new NodeId(opaque);
            }

            return new PortableNodeId
            {
                NamespaceUri = namespaceUri,
                Identifier = stripped
            };
        }

        private readonly IServerInternal m_server;
    }
}