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using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using Opc.Ua.Server.Fluent;
using Opc.Ua.Server.RuntimeNodeSet;
using Quickstarts.ReferenceServer;

namespace Opc.Ua.Server.Tests.RuntimeNodeSet
{
    /// <summary>
    /// A <see cref="ReferenceServer"/> that loads the existing
    /// <c>ServerComplexTypesTestModel.NodeSet2.xml</c> embedded resource through
    /// <see cref="RuntimeNodeSetNodeManagerFactory"/> instead of the hand-written
    /// <c>ServerComplexTypesTestNodeManager</c>. This exercises the full runtime
    /// NodeSet import path including namespace registration, parent-child linking,
    /// fluent configure callbacks, and the default complex-type loading sequence.
    /// </summary>
    internal sealed class RuntimeNodeSetTestServer : ReferenceServer
    {
        /// <summary>
        /// The namespace URI of the runtime test model (reuses the complex types test model).
        /// </summary>
        public const string NamespaceUri = "http://opcfoundation.org/UA/ServerComplexTypesTest/";

        /// <summary>
        /// Node identifier of the container object that holds the test variables.
        /// </summary>
        public const uint ComplexTypesTestDataObject = 15020;

        /// <summary>
        /// Node identifier of the <c>PointValue</c> variable.
        /// </summary>
        public const uint PointValueVariable = 15021;

        /// <summary>
        /// Node identifier of the <c>ColorValue</c> variable.
        /// </summary>
        public const uint ColorValueVariable = 15022;

        /// <summary>
        /// Node identifier of the <c>TestPoint</c> structure DataType.
        /// </summary>
        public const uint TestPointDataType = 15010;

        /// <summary>
        /// Node identifier of the <c>TestPoint</c> Default Binary encoding node.
        /// </summary>
        public const uint TestPointBinaryEncoding = 15011;

        /// <summary>
        /// Node identifier of the <c>TestColor</c> enumeration DataType.
        /// </summary>
        public const uint TestColorDataType = 15001;

        /// <summary>
        /// Counter incremented by the <c>OnRead</c> callback wired on
        /// <c>ColorValue</c>. Tests may read this to verify the callback fired.
        /// </summary>
        public static int ColorValueReadCallbackCount;

        private const string kResourceName =
            "Opc.Ua.Server.Tests.ComplexTypes.ServerComplexTypesTestModel.NodeSet2.xml";

        /// <summary>
        /// Initializes the server and registers the
        /// <see cref="RuntimeNodeSetNodeManagerFactory"/> that loads the embedded
        /// test NodeSet via a stream source.
        /// </summary>
        /// <param name="telemetry">
        /// Telemetry context forwarded to the base server.
        /// </param>
        public RuntimeNodeSetTestServer(ITelemetryContext telemetry)
            : base(telemetry)
        {
            Interlocked.Exchange(ref ColorValueReadCallbackCount, 0);

            var options = new RuntimeNodeSetOptions
            {
                Sources = [RuntimeNodeSetSource.FromStream(
                    "ServerComplexTypesTestModel",
                    _ => new System.Threading.Tasks.ValueTask<Stream>(OpenTestStream()),
                    [NamespaceUri])],
                DefaultNamespaceUri = NamespaceUri,
                Configure = builder =>
                {
                    // Wire an OnRead callback on ColorValue to prove the fluent
                    // configure path and parent-child browse resolution work.
                    builder
                        .Node("ComplexTypesTestData/ColorValue")
                        .OnRead(static (ISystemContext c, NodeState n, ref Variant v) =>
                        {
                            Interlocked.Increment(ref ColorValueReadCallbackCount);
                            return ServiceResult.Good;
                        });
                }
            };

            AddNodeManager(new RuntimeNodeSetNodeManagerFactory(options));
        }

        /// <summary>
        /// Opens the embedded test NodeSet2 resource stream.
        /// </summary>
        internal static Stream OpenTestStream()
        {
            Stream stream = typeof(RuntimeNodeSetTestServer).Assembly
                .GetManifestResourceStream(kResourceName)!;

            if (stream is null)
            {
                throw new InvalidOperationException(
                    $"Embedded resource '{kResourceName}' was not found.");
            }

            return stream;
        }
    }
}