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 * OPC Foundation MIT License 1.00
 *
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 * obtaining a copy of this software and associated documentation
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using System.Collections.Generic;
using NUnit.Framework;
using Opc.Ua.Tests;

using PubSubEncoding = Opc.Ua.PubSub.Encoding;

namespace Opc.Ua.PubSub.Tests.Encoding
{
    [TestFixture]
    [Category("Encoders")]
    [SetCulture("en-us")]
    [SetUICulture("en-us")]
    [Parallelizable]
    public class UaNetworkMessageTests
    {
        private ServiceMessageContext m_messageContext;

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

        [Test]
        public void DataSetMessagesConstructorSetsProperties()
        {
            var writerGroup = new WriterGroupDataType { Enabled = true, Name = "WG1", WriterGroupId = 5 };
            var messages = new List<PubSubEncoding.JsonDataSetMessage>();

            var msg = new PubSubEncoding.JsonNetworkMessage(writerGroup, messages);

            Assert.That(msg.DataSetMessages, Is.Not.Null);
            Assert.That(msg.DataSetMessages, Has.Count.Zero);
            Assert.That(msg.IsMetaDataMessage, Is.False);
            Assert.That(msg.DataSetMetaData, Is.Null);
        }

        [Test]
        public void MetaDataConstructorSetsProperties()
        {
            var writerGroup = new WriterGroupDataType { Enabled = true, Name = "WG1" };
            var metadata = new DataSetMetaDataType { Name = "Meta1" };

            var msg = new PubSubEncoding.JsonNetworkMessage(writerGroup, metadata);

            Assert.That(msg.IsMetaDataMessage, Is.True);
            Assert.That(msg.DataSetMetaData, Is.Not.Null);
            Assert.That(msg.DataSetMetaData.Name, Is.EqualTo("Meta1"));
            Assert.That(msg.DataSetMessages, Is.Not.Null);
            Assert.That(msg.DataSetMessages, Has.Count.Zero);
        }

        [Test]
        public void WriterGroupIdPropertyRoundTrips()
        {
            var msg = new PubSubEncoding.JsonNetworkMessage
            {
                WriterGroupId = 42
            };
            Assert.That(msg.WriterGroupId, Is.EqualTo(42));
        }

        [Test]
        public void DataSetWriterIdSetGetRoundTrips()
        {
            var msg = new PubSubEncoding.JsonNetworkMessage
            {
                DataSetWriterId = 123
            };
            Assert.That(msg.DataSetWriterId, Is.EqualTo(123));
        }

        [Test]
        public void DataSetWriterIdReturnsNullWhenUnsetAndNoMessages()
        {
            var msg = new PubSubEncoding.JsonNetworkMessage();
            Assert.That(msg.DataSetWriterId, Is.Null);
        }

        [Test]
        public void DataSetWriterIdReturnsSingleMessageWriterIdWhenUnset()
        {
            var dsMessage = new PubSubEncoding.JsonDataSetMessage { DataSetWriterId = 77 };
            var writerGroup = new WriterGroupDataType { Enabled = true, Name = "WG1" };
            var msg = new PubSubEncoding.JsonNetworkMessage(writerGroup, [dsMessage]);

            Assert.That(msg.DataSetWriterId, Is.EqualTo(77));
        }

        [Test]
        public void DataSetWriterIdReturnsNullWhenUnsetAndMultipleMessages()
        {
            var dsMessage1 = new PubSubEncoding.JsonDataSetMessage { DataSetWriterId = 10 };
            var dsMessage2 = new PubSubEncoding.JsonDataSetMessage { DataSetWriterId = 20 };
            var writerGroup = new WriterGroupDataType { Enabled = true, Name = "WG1" };
            var msg = new PubSubEncoding.JsonNetworkMessage(
                writerGroup, [dsMessage1, dsMessage2]);

            Assert.That(msg.DataSetWriterId, Is.Null);
        }

        [Test]
        public void DataSetWriterIdSetToNullResetsToZero()
        {
            var msg = new PubSubEncoding.JsonNetworkMessage
            {
                DataSetWriterId = 99
            };
            msg.DataSetWriterId = null;
            Assert.That(msg.DataSetWriterId, Is.Null);
        }

        [Test]
        public void DataSetDecodeErrorOccurredEventCanBeSubscribed()
        {
            var msg = new PubSubEncoding.JsonNetworkMessage();
            DataSetDecodeErrorEventArgs receivedArgs = null;
            msg.DataSetDecodeErrorOccurred += (_, args) => receivedArgs = args;

            Assert.That(receivedArgs, Is.Null);
        }

        [Test]
        public void DataSetDecodeErrorOccurredEventWithNoSubscriberDoesNotThrow()
        {
            var msg = new PubSubEncoding.JsonNetworkMessage();
            Assert.DoesNotThrow(() => msg.Decode(
                    m_messageContext,
                    System.Text.Encoding.UTF8.GetBytes("{}"),
                    []));
        }

        [Test]
        public void DataSetMessagesListAcceptsNewItems()
        {
            var msg = new PubSubEncoding.JsonNetworkMessage();
            Assert.That(msg.DataSetMessages, Is.Not.Null);

            var dsMessage = new PubSubEncoding.JsonDataSetMessage { DataSetWriterId = 5 };
            msg.DataSetMessages.Add(dsMessage);

            Assert.That(msg.DataSetMessages, Has.Count.EqualTo(1));
        }

        [Test]
        public void MetaDataConstructorWithNullWriterGroupDoesNotThrow()
        {
            var metadata = new DataSetMetaDataType { Name = "Meta1" };
            Assert.DoesNotThrow(() =>
            {
                var msg = new PubSubEncoding.JsonNetworkMessage(null, metadata);
                Assert.That(msg.IsMetaDataMessage, Is.True);
            });
        }

        [Test]
        public void DataSetMessagesConstructorWithNullListCreatesEmptyMessages()
        {
            var writerGroup = new WriterGroupDataType { Enabled = true, Name = "WG1" };
            var msg = new PubSubEncoding.JsonNetworkMessage(
                writerGroup, (List<PubSubEncoding.JsonDataSetMessage>)null);
            Assert.That(msg.DataSetMessages, Is.Not.Null);
            Assert.That(msg.DataSetMessages, Has.Count.Zero);
        }

        [Test]
        public void WriterGroupIdDefaultIsZero()
        {
            var msg = new PubSubEncoding.JsonNetworkMessage();
            Assert.That(msg.WriterGroupId, Is.Zero);
        }
    }
}