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 * 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.
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using System.IO;
using System.Threading;
using System.Threading.Tasks;
using Opc.Ua;
using Opc.Ua.Gds;
using Opc.Ua.Gds.Server;
using Opc.Ua.Gds.Server.Database.Linq;
using Opc.Ua.Server;

namespace Quickstarts.ReferenceServer
{
    /// <summary>
    /// Factory that creates the GDS ApplicationsNodeManager for the reference server.
    /// The node manager automatically wires handlers for:
    /// <list type="bullet">
    /// <item><description>CertificateDirectoryType (Part 12 §7.6)</description></item>
    /// <item><description>KeyCredentialServiceType (Part 12 §8)</description></item>
    /// <item><description>AuthorizationServiceType (Part 12 §9)</description></item>
    /// </list>
    /// </summary>
    public sealed class GdsNodeManagerFactory : IAsyncNodeManagerFactory
    {
        private readonly GlobalDiscoveryServerConfiguration m_gdsConfiguration;

        /// <summary>
        /// Initializes a new instance of the <see cref="GdsNodeManagerFactory"/> class.
        /// </summary>
        /// <param name="gdsConfiguration">The GDS configuration.</param>
        public GdsNodeManagerFactory(GlobalDiscoveryServerConfiguration gdsConfiguration)
        {
            m_gdsConfiguration = gdsConfiguration;
        }

        /// <inheritdoc/>
        public ArrayOf<string> NamespacesUris =>
        [
            "http://opcfoundation.org/UA/GDS/applications/",
            Opc.Ua.Gds.Namespaces.OpcUaGds
        ];

        /// <inheritdoc/>
        public ValueTask<IAsyncNodeManager> CreateAsync(
            IServerInternal server,
            ApplicationConfiguration configuration,
            CancellationToken cancellationToken = default)
        {
            // Ensure the GDS data types are registered in the message context
            if (!server.MessageContext.Factory.ContainsEncodeableType(
                Opc.Ua.Gds.DataTypeIds.ApplicationRecordDataType))
            {
                server.MessageContext.Factory.Builder
                    .AddOpcUaGds()
                    .Commit();
            }

            string? databaseStorePath = Utils.ReplaceSpecialFolderNames(
                m_gdsConfiguration.DatabaseStorePath);

            // Ensure the directory exists
            string? databaseDir = Path.GetDirectoryName(databaseStorePath);
            if (!string.IsNullOrEmpty(databaseDir))
            {
                Directory.CreateDirectory(databaseDir);
            }

            LinqApplicationsDatabase database = string.IsNullOrEmpty(databaseDir)
                ? new LinqApplicationsDatabase()
                : JsonApplicationsDatabase.Load(databaseStorePath!);

#pragma warning disable CA2000 // Ownership is transferred to the server via returned node manager instance.
            return new ValueTask<IAsyncNodeManager>(
                new ApplicationsNodeManager(
                    server,
                    configuration,
                    database,
                    database,
                    new CertificateGroup(server.Telemetry),
                    autoApprove: true));
#pragma warning restore CA2000
        }
    }
}