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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
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 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
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 * http://opcfoundation.org/License/MIT/1.00/
 * ======================================================================*/

// CA2000: test code; many disposables are ownership-transferred to test fixtures or short-lived,
// making CA2000 noisy without a real leak risk. Disabled file-level for the suite.
#pragma warning disable CA2000
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.Metrics;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;
using Moq;
using NUnit.Framework;
using Opc.Ua.Tests;

namespace Opc.Ua.Core.Tests.Stack.Client
{
    /// <summary>
    /// Unit tests for ClientBase class testing all ActivityTraceFlags combinations.
    /// </summary>
    [TestFixture]
    [Category("ClientBase")]
    [SetCulture("en-us")]
    [SetUICulture("en-us")]
    [Parallelizable]
    public class ClientBaseTests
    {
        private Mock<ITransportChannel>? m_transportChannelMock;
        private Mock<IServiceMessageContext>? m_messageContextMock;
        private RecordingLoggerProvider? m_loggerProvider;
        private TestMeterListener? m_meterListener;
        private ITelemetryContext? m_telemetry;

        [SetUp]
        public void SetUp()
        {
            m_loggerProvider = new RecordingLoggerProvider();
            m_telemetry = DefaultTelemetry.Create(
                configure => configure
                    .SetMinimumLevel(LogLevel.Trace)
                    .AddProvider(m_loggerProvider));
            m_messageContextMock = new Mock<IServiceMessageContext>();
            m_messageContextMock
                .Setup(m => m.Telemetry)
                .Returns(m_telemetry);
            m_transportChannelMock = new Mock<ITransportChannel>();
            m_transportChannelMock
                .Setup(m => m.MessageContext)
                .Returns(m_messageContextMock.Object);
            m_transportChannelMock
                .Setup(m => m.EndpointDescription)
                .Returns(new EndpointDescription { EndpointUrl = "opc.tcp://localhost:4840" });
            m_transportChannelMock
                .Setup(m => m.OperationTimeout).Returns(5000);
            m_meterListener = new TestMeterListener();
        }

        [TearDown]
        public void TearDown()
        {
            m_meterListener?.Dispose();
            m_loggerProvider?.Dispose();
        }

        [Test]
        public void Constructor_WithValidChannel_ShouldInitializeClientBase()
        {
            // Arrange & Act
            using var sut = new TestableClientBase(m_transportChannelMock!.Object, m_telemetry!);

            // Assert
            Assert.That(sut.NullableTransportChannel, Is.Not.Null);
            Assert.That(sut.ActivityTraceFlags, Is.EqualTo(ClientTraceFlags.None));
        }

        [Test]
        public void Constructor_WithNullChannel_ShouldThrowArgumentNullException()
        {
            // Act & Assert
            Assert.Throws<ArgumentNullException>(() => new TestableClientBase(null!, m_telemetry!));
        }

        /// <summary>
        /// Accessing the message context after closure must report the channel
        /// failure instead of dereferencing a missing transport channel.
        /// </summary>
        [Test]
        public async Task MessageContextReportsClosedChannelAsync()
        {
            using var sut = new TestableClientBase(m_transportChannelMock!.Object, m_telemetry!);
            Assert.That(sut.MessageContext, Is.SameAs(m_messageContextMock!.Object));

            await sut.TestCloseChannelAsync().ConfigureAwait(false);

            Assert.That(
                () => sut.MessageContext,
                Throws.TypeOf<ServiceResultException>()
                    .With.Property(nameof(ServiceResultException.StatusCode))
                    .EqualTo((StatusCode)StatusCodes.BadSecureChannelClosed));
        }

        [Test]
        public async Task RequestCompletedAfterChannelCloseWithMetricsDoesNotThrowAsync()
        {
            using var sut = new TestableClientBase(m_transportChannelMock!.Object, m_telemetry!);
            sut.ActivityTraceFlags = ClientTraceFlags.Metrics;

            var request = new ReadRequest { RequestHeader = new RequestHeader() };
            var response = new ReadResponse
            {
                ResponseHeader = new ResponseHeader
                {
                    RequestHandle = request.RequestHeader.RequestHandle,
                    ServiceResult = StatusCodes.Good
                }
            };

            await sut.TestCloseChannelAsync().ConfigureAwait(false);

            Assert.DoesNotThrow(() => sut.TestRequestCompleted(request, response, "Read"));
        }

        /// <summary>
        /// Channel-backed properties report the protocol error used by generated-client cleanup.
        /// </summary>
        [TestCase(nameof(ClientBase.MessageContext))]
        [TestCase(nameof(ClientBase.Endpoint))]
        [TestCase(nameof(ClientBase.EndpointConfiguration))]
        public async Task ClosedChannelPropertiesReportProtocolFailureAsync(string member)
        {
            using var sut = new TestableClientBase(m_transportChannelMock!.Object, m_telemetry!);
            await sut.TestCloseChannelAsync().ConfigureAwait(false);

            Action read = member switch
            {
                nameof(ClientBase.MessageContext) => () => _ = sut.MessageContext,
                nameof(ClientBase.Endpoint) => () => _ = sut.Endpoint,
                nameof(ClientBase.EndpointConfiguration) => () => _ = sut.EndpointConfiguration,
                _ => throw new ArgumentOutOfRangeException(nameof(member))
            };
            ServiceResultException? error = Assert.Throws<ServiceResultException>(read);
            Assert.That(error!.StatusCode, Is.EqualTo(StatusCodes.BadSecureChannelClosed));
        }

        [Test]
        public void ActivityTraceFlags_None_ShouldNotRecordAnything()
        {
            // Arrange
            using var sut = new TestableClientBase(m_transportChannelMock!.Object, m_telemetry!);
            sut.ActivityTraceFlags = ClientTraceFlags.None;

            var request = new ReadRequest { RequestHeader = new RequestHeader() };
            var response = new ReadResponse
            {
                ResponseHeader = new ResponseHeader
                {
                    RequestHandle = request.RequestHeader.RequestHandle,
                    ServiceResult = StatusCodes.Good
                }
            };

            // Act
            sut.TestUpdateRequestHeader(request, true, "Read");
            sut.TestRequestCompleted(request, response, "Read");

            // Assert
            Assert.That(m_loggerProvider!.Records, Is.Empty);
            Assert.That(m_meterListener!.RecordedMeasurements, Is.Empty);
        }

        [Test]
        public void ActivityTraceFlags_Metrics_ShouldRecordMetricsOnly()
        {
            // Arrange
            using var sut = new TestableClientBase(m_transportChannelMock!.Object, m_telemetry!);
            sut.ActivityTraceFlags = ClientTraceFlags.Metrics;

            var request = new ReadRequest { RequestHeader = new RequestHeader() };
            var response = new ReadResponse
            {
                ResponseHeader = new ResponseHeader
                {
                    RequestHandle = request.RequestHeader.RequestHandle,
                    ServiceResult = StatusCodes.Good
                }
            };

            m_meterListener!.StartListening(sut.ClientBaseMeter!);

            // Act
            sut.TestUpdateRequestHeader(request, true, "Read");
            var sw = Stopwatch.StartNew();
            Thread.Sleep(TimeSpan.FromMilliseconds(100)); // simulate some duration
            sw.Stop();
            sut.TestRequestCompleted(request, response, "Read");

            // Assert - metrics should be recorded
            Assert.That(m_meterListener.RecordedMeasurements, Is.Not.Empty);
            TestMeterListener.MeasurementRecord measurement =
                m_meterListener.RecordedMeasurements.FirstOrDefault()!;
            Assert.That(measurement!, Is.Not.Null);
            Assert.That(measurement.InstrumentName, Is.EqualTo("opc.ua.client.request.duration"));
            Assert.That(measurement.Value, Is.EqualTo(sw.Elapsed.TotalSeconds).Within(0.03));

            // Assert - no logs should be recorded
            Assert.That(m_loggerProvider!.Records
                .Count(record => record.Message.Contains("Read", StringComparison.Ordinal)), Is.Zero);
        }

        [Test]
        public void ActivityTraceFlags_Log_ShouldRecordLogsOnly()
        {
            // Arrange
            using var sut = new TestableClientBase(m_transportChannelMock!.Object, m_telemetry!);
            sut.ActivityTraceFlags = ClientTraceFlags.Log;

            var request = new ReadRequest { RequestHeader = new RequestHeader() };
            var response = new ReadResponse
            {
                ResponseHeader = new ResponseHeader
                {
                    RequestHandle = request.RequestHeader.RequestHandle,
                    ServiceResult = StatusCodes.Good
                }
            };

            // Act
            sut.TestUpdateRequestHeader(request, true, "Read");
            sut.TestRequestCompleted(request, response, "Read");

            // Assert - compatibility logs should be recorded
            Assert.That(m_loggerProvider!.Records, Has.Count.EqualTo(2));
            Assert.That(m_loggerProvider.Records.Any(record =>
                record.CategoryName == CoreEventIds.CoreCompatibilityCategory &&
                record.EventId.Id == CoreEventIds.CoreServiceCallStart &&
                record.EventId.Name == "ServiceCallStart"), Is.True);
            Assert.That(m_loggerProvider.Records.Any(record =>
                record.CategoryName == CoreEventIds.CoreCompatibilityCategory &&
                record.EventId.Id == CoreEventIds.CoreServiceCallStop &&
                record.EventId.Name == "ServiceCallStop"), Is.True);

            // Assert - no metrics should be recorded
            Assert.That(m_meterListener!.RecordedMeasurements, Is.Empty);
        }

        [Test]
        public void ActivityTraceFlags_Traces_ShouldAddActivityEvents()
        {
            // Arrange
            using var sut = new TestableClientBase(m_transportChannelMock!.Object, m_telemetry!);
            sut.ActivityTraceFlags = ClientTraceFlags.Traces;

            var request = new ReadRequest { RequestHeader = new RequestHeader() };
            var response = new ReadResponse
            {
                ResponseHeader = new ResponseHeader
                {
                    RequestHandle = request.RequestHeader.RequestHandle,
                    ServiceResult = StatusCodes.Good
                }
            };

            var activityListener = new TestActivityListener();

            // Act
            using (Activity activity = new Activity("TestActivity").Start())
            {
                sut.TestUpdateRequestHeader(request, true, "Read");
                sut.TestRequestCompleted(request, response, "Read");

                // Assert - trace context should be added to request header
                Assert.That(request.RequestHeader.AdditionalHeader.IsNull, Is.False);
                Assert.That(request.RequestHeader.AdditionalHeader!.TryGetValue(
                    out AdditionalParametersType? additionalParams), Is.True);
                Assert.That(additionalParams, Is.Not.Null);
                Assert.That(additionalParams.Parameters.IsEmpty, Is.False);
                KeyValuePair spanContextParam =
                    additionalParams.Parameters.ToList().FirstOrDefault(p => p.Key == "SpanContext")!;
                Assert.That(spanContextParam, Is.Not.Null);
            }

            // Assert - activity events should be recorded
            Assert.That(activityListener.RecordedEvents, Is.Not.Empty);
            Assert.That(activityListener.RecordedEvents.Any(e => e.Name == "Started"), Is.True);
            Assert.That(activityListener.RecordedEvents.Any(e => e.Name == "Completed"), Is.True);

            activityListener.Dispose();
        }

        [Test]
        public void ActivityTraceFlags_MetricsAndLog_ShouldRecordBoth()
        {
            // Arrange
            using var sut = new TestableClientBase(m_transportChannelMock!.Object, m_telemetry!);
            sut.ActivityTraceFlags = ClientTraceFlags.Metrics | ClientTraceFlags.Log;

            var request = new ReadRequest { RequestHeader = new RequestHeader() };
            var response = new ReadResponse
            {
                ResponseHeader = new ResponseHeader
                {
                    RequestHandle = request.RequestHeader.RequestHandle,
                    ServiceResult = StatusCodes.Good
                }
            };

            m_meterListener!.StartListening(sut.ClientBaseMeter!);

            // Act
            sut.TestUpdateRequestHeader(request, true, "Read");
            Thread.Sleep(50);
            sut.TestRequestCompleted(request, response, "Read");

            // Assert - both metrics and logs should be recorded
            Assert.That(m_meterListener.RecordedMeasurements, Is.Not.Empty);
            Assert.That(m_loggerProvider!.Records, Is.Not.Empty);
        }

        [Test]
        public void ActivityTraceFlags_TracesAndMetrics_ShouldRecordBoth()
        {
            // Arrange
            using var sut = new TestableClientBase(m_transportChannelMock!.Object, m_telemetry!);
            sut.ActivityTraceFlags = ClientTraceFlags.Traces | ClientTraceFlags.Metrics;

            var request = new ReadRequest { RequestHeader = new RequestHeader() };
            var response = new ReadResponse
            {
                ResponseHeader = new ResponseHeader
                {
                    RequestHandle = request.RequestHeader.RequestHandle,
                    ServiceResult = StatusCodes.Good
                }
            };

            var activityListener = new TestActivityListener();
            m_meterListener!.StartListening(sut.ClientBaseMeter!);

            // Act
            using (Activity activity = new Activity("TestActivity").Start())
            {
                sut.TestUpdateRequestHeader(request, true, "Read");
                Thread.Sleep(50);
                sut.TestRequestCompleted(request, response, "Read");
            }
            // Assert - both traces and metrics should be recorded
            Assert.That(activityListener.RecordedEvents, Is.Not.Empty);
            Assert.That(m_meterListener.RecordedMeasurements, Is.Not.Empty);

            activityListener.Dispose();
        }

        [Test]
        public void ActivityTraceFlags_AllFlags_ShouldRecordEverything()
        {
            // Arrange
            using var sut = new TestableClientBase(m_transportChannelMock!.Object, m_telemetry!);
            sut.ActivityTraceFlags =
                ClientTraceFlags.Metrics |
                ClientTraceFlags.Traces |
                ClientTraceFlags.Log;

            var request = new ReadRequest { RequestHeader = new RequestHeader() };
            var response = new ReadResponse
            {
                ResponseHeader = new ResponseHeader
                {
                    RequestHandle = request.RequestHeader.RequestHandle,
                    ServiceResult = StatusCodes.Good
                }
            };

            var activityListener = new TestActivityListener();
            m_meterListener!.StartListening(sut.ClientBaseMeter!);

            // Act
            using (Activity activity = new Activity("TestActivity").Start())
            {
                sut.TestUpdateRequestHeader(request, true, "Read");
                Thread.Sleep(50);
                sut.TestRequestCompleted(request, response, "Read");
            }
            // Assert - all should be recorded
            Assert.That(m_meterListener.RecordedMeasurements, Is.Not.Empty);
            Assert.That(m_loggerProvider!.Records, Is.Not.Empty);
            Assert.That(activityListener.RecordedEvents, Is.Not.Empty);

            activityListener.Dispose();
        }

        [Test]
        public void RequestCompleted_WithBadStatusCode_ShouldLogError()
        {
            // Arrange
            using var sut = new TestableClientBase(m_transportChannelMock!.Object, m_telemetry!);
            sut.ActivityTraceFlags = ClientTraceFlags.Log;

            var request = new ReadRequest { RequestHeader = new RequestHeader() };
            var response = new ReadResponse
            {
                ResponseHeader = new ResponseHeader
                {
                    RequestHandle = request.RequestHeader.RequestHandle,
                    ServiceResult = StatusCodes.BadTimeout
                }
            };

            // Act
            sut.TestUpdateRequestHeader(request, true, "Read");
            sut.TestRequestCompleted(request, response, "Read");

            // Assert
            RecordedLogRecord record = m_loggerProvider!.Records.Single(candidate =>
                candidate.CategoryName == CoreEventIds.CoreCompatibilityCategory &&
                candidate.EventId.Id == CoreEventIds.CoreServiceCallBadStop);
            Assert.That(record.EventId.Name, Is.EqualTo("ServiceCallBadStop"));
            Assert.That(
                record.Properties["StatusCode"],
                Is.EqualTo(unchecked((int)StatusCodes.BadTimeout.Code)));
        }

        [Test]
        public void UpdateRequestHeader_ShouldSetDefaultValues()
        {
            // Arrange
            using var sut = new TestableClientBase(m_transportChannelMock!.Object, m_telemetry!);
            var request = new ReadRequest { RequestHeader = new RequestHeader() };

            // Act
            sut.TestUpdateRequestHeader(request, true);

            // Assert
            Assert.That(request.RequestHeader.RequestHandle, Is.GreaterThan(0u));
            Assert.That(request.RequestHeader.Timestamp, Is.Not.EqualTo(DateTime.MinValue));
        }

        [Test]
        public void NewRequestHandle_ShouldGenerateUniqueHandles()
        {
            // Arrange
            using var sut = new TestableClientBase(m_transportChannelMock!.Object, m_telemetry!);

            // Act
            uint handle1 = sut.NewRequestHandle();
            uint handle2 = sut.NewRequestHandle();
            uint handle3 = sut.NewRequestHandle();

            // Assert
            Assert.That(handle1, Is.Not.EqualTo(handle2));
            Assert.That(handle2, Is.Not.EqualTo(handle3));
            Assert.That(handle1, Is.Not.EqualTo(handle3));
        }

        [Test]
        public void ValidateResponseSurfacesRetryAfterFromAdditionalHeader()
        {
            var header = new ResponseHeader { ServiceResult = StatusCodes.BadServerTooBusy };
            RetryAfterHeader.AttachTo(header, TimeSpan.FromSeconds(2));

            ServiceResultException ex = Assert.Throws<ServiceResultException>(
                () => TestableClientBase.TestValidateResponse(header))!;

            Assert.That(ex.StatusCode, Is.EqualTo(StatusCodes.BadServerTooBusy));
            Assert.That(ex.AdditionalInfo, Does.Contain("RetryAfterMs=2000"));
        }

        [Test]
        public void ValidateResponseIgnoresRetryAfterOnGoodResponse()
        {
            var header = new ResponseHeader { ServiceResult = StatusCodes.Good };
            RetryAfterHeader.AttachTo(header, TimeSpan.FromSeconds(2));

            Assert.DoesNotThrow(() => TestableClientBase.TestValidateResponse(header));
        }

        [Test]
        public void ValidateResponseMergesRetryAfterIntoExistingAdditionalInfo()
        {
            var header = new ResponseHeader
            {
                ServiceResult = StatusCodes.BadServerTooBusy,
                ServiceDiagnostics = new DiagnosticInfo { AdditionalInfo = "diagnostic detail" }
            };
            RetryAfterHeader.AttachTo(header, TimeSpan.FromSeconds(2));

            ServiceResultException ex = Assert.Throws<ServiceResultException>(
                () => TestableClientBase.TestValidateResponse(header))!;

            // The existing diagnostic AdditionalInfo is preserved and the header
            // hint is merged in (not overwritten).
            Assert.That(ex.AdditionalInfo, Does.Contain("diagnostic detail"));
            Assert.That(ex.AdditionalInfo, Does.Contain("RetryAfterMs=2000"));
        }

        [Test]
        public void ValidateResponseKeepsExistingRetryAfterToken()
        {
            var header = new ResponseHeader
            {
                ServiceResult = StatusCodes.BadServerTooBusy,
                ServiceDiagnostics = new DiagnosticInfo { AdditionalInfo = "RetryAfterMs=5000" }
            };
            RetryAfterHeader.AttachTo(header, TimeSpan.FromSeconds(2));

            ServiceResultException ex = Assert.Throws<ServiceResultException>(
                () => TestableClientBase.TestValidateResponse(header))!;

            // A retry-after token already present in AdditionalInfo is kept as-is;
            // the header value is not appended.
            Assert.That(ex.AdditionalInfo, Is.EqualTo("RetryAfterMs=5000"));
        }

        /// <summary>
        /// Testable wrapper for ClientBase that exposes protected members.
        /// </summary>
        private sealed class TestableClientBase : ClientBase
        {
            public TestableClientBase(ITransportChannel channel, ITelemetryContext telemetry)
                : base(channel, telemetry)
            {
            }

            public void TestUpdateRequestHeader(IServiceRequest request, bool useDefaults)
            {
                UpdateRequestHeader(request, useDefaults);
            }

            public void TestUpdateRequestHeader(IServiceRequest request, bool useDefaults, string serviceName)
            {
                UpdateRequestHeader(request, useDefaults, serviceName);
            }

            public void TestRequestCompleted(IServiceRequest request, IServiceResponse response, string serviceName)
            {
                RequestCompleted(request, response, serviceName);
            }

            public Task TestCloseChannelAsync()
            {
                return CloseChannelAsync(CancellationToken.None);
            }

            public static void TestValidateResponse(ResponseHeader header)
            {
                ValidateResponse(header);
            }

            public Meter? ClientBaseMeter =>
                (Meter?)typeof(ClientBase)
                    .GetField(
                        "m_meter",
                        System.Reflection.BindingFlags.NonPublic |
                        System.Reflection.BindingFlags.Instance)?
                    .GetValue(this);
        }

        /// <summary>
        /// Test meter listener for capturing recorded measurements.
        /// </summary>
        private sealed class TestMeterListener : IDisposable
        {
            private MeterListener? m_listener;
            public List<MeasurementRecord> RecordedMeasurements { get; } = [];

            public void StartListening(Meter meter)
            {
                m_listener = new MeterListener
                {
                    InstrumentPublished = (instrument, listener) =>
                    {
                        // Match the meter instance, not its name: every meter
                        // created by the telemetry context is named after the
                        // assembly, so a name match would also capture e.g. the
                        // channel manager metrics of tests running in parallel.
                        if (ReferenceEquals(instrument.Meter, meter))
                        {
                            listener.EnableMeasurementEvents(instrument);
                        }
                    }
                };

                m_listener.SetMeasurementEventCallback<double>(OnMeasurementRecorded);
                m_listener.Start();
            }

            private void OnMeasurementRecorded(
                Instrument instrument,
                double measurement,
                ReadOnlySpan<KeyValuePair<string, object?>> tags,
                object? state)
            {
                RecordedMeasurements.Add(new MeasurementRecord
                {
                    InstrumentName = instrument.Name,
                    Value = measurement,
                    Tags = tags.ToArray()
                });
            }

            public void Dispose()
            {
                m_listener?.Dispose();
            }

            public sealed class MeasurementRecord
            {
                public string InstrumentName { get; set; } = string.Empty;
                public double Value { get; set; }
                public KeyValuePair<string, object?>[] Tags { get; set; } = [];
            }
        }

        /// <summary>
        /// Test activity listener for capturing activity events.
        /// </summary>
        private sealed class TestActivityListener : IDisposable
        {
            private readonly ActivityListener m_listener;

            public Activity? CurrentActivity { get; private set; }

            public List<ActivityEvent> RecordedEvents { get; } = [];

            public TestActivityListener()
            {
                m_listener = new ActivityListener
                {
                    ShouldListenTo = _ => true,
                    Sample = (ref _) => ActivitySamplingResult.AllDataAndRecorded,
                    ActivityStarted = activity => CurrentActivity = activity,
                    ActivityStopped = activity =>
                    {
                        // Capture events when activity stops
                        if (activity != null)
                        {
                            RecordedEvents.AddRange(activity.Events);
                        }
                    }
                };

                ActivitySource.AddActivityListener(m_listener);
            }

            public ActivityListener GetListener()
            {
                return m_listener;
            }

            public void Dispose()
            {
                m_listener?.Dispose();
            }
        }
    }
}