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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
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 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
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 *
 * The above copyright notice and this permission notice shall be
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 * OTHER DEALINGS IN THE SOFTWARE.
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 * The complete license agreement can be found here:
 * http://opcfoundation.org/License/MIT/1.00/
 * ======================================================================*/

using System;
using System.IO;
using NUnit.Framework;
using Opc.Ua.Tests;

namespace Opc.Ua.Core.Tests
{
    [TestFixture]
    [Category("SessionLess")]
    [SetCulture("en-us")]
    [SetUICulture("en-us")]
    [Parallelizable]
    public class SessionLessMessageTests
    {
        private ServiceMessageContext m_context;

        [SetUp]
        public void SetUp()
        {
            ITelemetryContext telemetry = NUnitTelemetryContext.Create();
            m_context = ServiceMessageContext.Create(telemetry);
        }

        [Test]
        public void DecodeAsJsonThrowsOnNullBuffer()
        {
            Assert.That(
                () => SessionLessMessage.DecodeAsJson(null!, m_context),
                Throws.TypeOf<ArgumentNullException>());
        }

        [Test]
        public void DecodeAsJsonThrowsOnNullContext()
        {
            Assert.That(
                () => SessionLessMessage.DecodeAsJson([], null!),
                Throws.TypeOf<ArgumentNullException>());
        }

        [Test]
        public void EncodeAsJsonThrowsOnNullMessage()
        {
            using var stream = new MemoryStream();
            Assert.That(
                () => SessionLessMessage.EncodeAsJson(null!, stream, m_context, true),
                Throws.TypeOf<ArgumentNullException>());
        }

        [Test]
        public void EncodeAsJsonThrowsOnNullContext()
        {
            using var stream = new MemoryStream();
            Assert.That(
                () => SessionLessMessage.EncodeAsJson(new ReadRequest(), stream, null!, true),
                Throws.TypeOf<ArgumentNullException>());
        }

        [Test]
        public void EncodeAndDecodeAsJsonRoundTrip()
        {
            var request = new ReadRequest
            {
                RequestHeader = new RequestHeader
                {
                    Timestamp = DateTime.UtcNow
                },
                MaxAge = 1000.0,
                TimestampsToReturn = TimestampsToReturn.Both
            };

            using var stream = new MemoryStream();
            SessionLessMessage.EncodeAsJson(request, stream, m_context, true);

            byte[] buffer = stream.ToArray();
            Assert.That(buffer, Is.Not.Empty);

            IEncodeable decoded = SessionLessMessage.DecodeAsJson(buffer, m_context);
            Assert.That(decoded, Is.Not.Null);
        }

        [Test]
        public void DecodeAsJsonChecksMaxMessageSize()
        {
            // The buffer was decoded without any MaxMessageSize check.
            var request = new ReadRequest { MaxAge = 1000.0 };
            using var stream = new MemoryStream();
            SessionLessMessage.EncodeAsJson(request, stream, m_context, true);
            byte[] buffer = stream.ToArray();
            m_context.MaxMessageSize = buffer.Length - 1;

            ServiceResultException sre = Assert.Throws<ServiceResultException>(
                () => SessionLessMessage.DecodeAsJson(buffer, m_context));
            Assert.That(sre.StatusCode, Is.EqualTo(StatusCodes.BadEncodingLimitsExceeded));
        }

        [Test]
        public void EncodeAsJsonLeaveOpenFalseDisposesStream()
        {
            var request = new ReadRequest();
            var stream = new MemoryStream();

            SessionLessMessage.EncodeAsJson(request, stream, m_context, false);

            Assert.That(() => stream.Position, Throws.TypeOf<ObjectDisposedException>());
        }

        [Test]
        public void EncodeAsJsonLeaveOpenTrueResetsPosition()
        {
            var request = new ReadRequest();
            using var stream = new MemoryStream();
            SessionLessMessage.EncodeAsJson(request, stream, m_context, true);
            Assert.That(stream.Position, Is.Zero);
        }

        [Test]
        public void EncodeAsJsonThrowsWhenMaxMessageSizeExceeded()
        {
            ITelemetryContext telemetry = NUnitTelemetryContext.Create();
            var smallContext = ServiceMessageContext.Create(telemetry);
            smallContext.MaxMessageSize = 1;
            var request = new ReadRequest
            {
                RequestHeader = new RequestHeader()
            };
            var stream = new MemoryStream();
            Assert.That(
                () => SessionLessMessage.EncodeAsJson(request, stream, smallContext, true),
                Throws.TypeOf<ServiceResultException>());
        }

        [Test]
        public void DecodeAsBinaryThrowsOnNullBuffer()
        {
            Assert.That(
                () => SessionLessMessage.DecodeAsBinary(null!, m_context),
                Throws.TypeOf<ArgumentNullException>());
        }

        [Test]
        public void DecodeAsBinaryThrowsOnNullContext()
        {
            Assert.That(
                () => SessionLessMessage.DecodeAsBinary([], null!),
                Throws.TypeOf<ArgumentNullException>());
        }

        [Test]
        public void EncodeAsBinaryThrowsOnNullContext()
        {
            using var stream = new MemoryStream();
            Assert.That(
                () => SessionLessMessage.EncodeAsBinary(new ReadRequest(), stream, null!, true),
                Throws.TypeOf<ArgumentNullException>());
        }

        [Test]
        public void EncodeAsBinaryThrowsOnNullMessage()
        {
            using var stream = new MemoryStream();
            Assert.That(
                () => SessionLessMessage.EncodeAsBinary(null!, stream, m_context, true),
                Throws.TypeOf<ArgumentNullException>());
        }

        [Test]
        public void EncodeAndDecodeAsBinaryRoundTrip()
        {
            var request = new ReadRequest
            {
                RequestHeader = new RequestHeader
                {
                    Timestamp = DateTime.UtcNow
                },
                MaxAge = 500.0,
                TimestampsToReturn = TimestampsToReturn.Server
            };

            using var stream = new MemoryStream();
            SessionLessMessage.EncodeAsBinary(request, stream, m_context, true);

            byte[] buffer = stream.ToArray();
            Assert.That(buffer, Is.Not.Empty);

            IEncodeable decoded = SessionLessMessage.DecodeAsBinary(buffer, m_context);
            Assert.That(decoded, Is.Not.Null);
        }

        [Test]
        public void DecodeAsBinaryThrowsOnInvalidTypeId()
        {
            using var stream = new MemoryStream();
            using (var encoder = new BinaryEncoder(stream, m_context, true))
            {
                encoder.WriteNodeId(null, new NodeId(999999));
            }

            byte[] buffer = stream.ToArray();
            Assert.That(
                () => SessionLessMessage.DecodeAsBinary(buffer, m_context),
                Throws.TypeOf<ServiceResultException>());
        }

        [Test]
        public void EncodeAsBinaryThrowsWhenMaxMessageSizeExceeded()
        {
            ITelemetryContext telemetry = NUnitTelemetryContext.Create();
            var smallContext = ServiceMessageContext.Create(telemetry);
            smallContext.MaxMessageSize = 1;
            var request = new ReadRequest
            {
                RequestHeader = new RequestHeader()
            };
            using var stream = new MemoryStream();
            Assert.That(
                () => SessionLessMessage.EncodeAsBinary(request, stream, smallContext, true),
                Throws.TypeOf<ServiceResultException>());
        }

        [Test]
        public void EncodeAsBinaryLeaveOpenTrueKeepsStreamOpen()
        {
            var request = new ReadRequest();
            using var stream = new MemoryStream();
            SessionLessMessage.EncodeAsBinary(request, stream, m_context, true);
            Assert.That(stream.CanRead, Is.True);
            Assert.That(stream.Length, Is.GreaterThan(0));
        }

        [Test]
        public void EncodeAsBinaryLeaveOpenFalseDisposesStream()
        {
            var request = new ReadRequest();
            var stream = new MemoryStream();

            SessionLessMessage.EncodeAsBinary(request, stream, m_context, false);

            Assert.That(() => stream.Position, Throws.TypeOf<ObjectDisposedException>());
        }
    }
}