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using System.Collections.Generic;
using System.Threading;
using Moq;
using Opc.Ua.PubSub.Adapter.Session;
using Opc.Ua.Tests;

namespace Opc.Ua.PubSub.Adapter.Tests
{
    /// <summary>
    /// Shared builders for the external-server PubSub adapter unit tests: a
    /// telemetry context, mocked sessions, and small PubSub configuration
    /// fragments (PublishedDataSets, WriterGroups) used to drive the adapter
    /// components without a real OPC UA server.
    /// </summary>
    internal static class AdapterTestHelpers
    {
        /// <summary>
        /// Creates a telemetry context suitable for unit tests.
        /// </summary>
        public static ITelemetryContext Telemetry()
        {
            return NUnitTelemetryContext.Create();
        }

        /// <summary>
        /// A single published variable description used to build PublishedDataSets.
        /// </summary>
        public readonly record struct Variable(NodeId Node, uint Attribute, double SamplingHint)
        {
            public static Variable Value(NodeId node, double samplingHint = 0)
            {
                return new Variable(node, Attributes.Value, samplingHint);
            }
        }

        /// <summary>
        /// Builds a PublishedDataSet whose DataSetSource carries the supplied
        /// published variables.
        /// </summary>
        public static PublishedDataSetDataType PublishedDataSet(
            string name,
            params Variable[] variables)
        {
            var published = new PublishedVariableDataType[variables.Length];
            for (int i = 0; i < variables.Length; i++)
            {
                published[i] = new PublishedVariableDataType
                {
                    PublishedVariable = variables[i].Node,
                    AttributeId = variables[i].Attribute,
                    SamplingIntervalHint = variables[i].SamplingHint
                };
            }

            return new PublishedDataSetDataType
            {
                Name = name,
                DataSetSource = new ExtensionObject(new PublishedDataItemsDataType
                {
                    PublishedData = published.ToArrayOf()
                })
            };
        }

        /// <summary>
        /// Builds a PubSub configuration with one connection holding a single
        /// WriterGroup that references the supplied datasets through DataSetWriters.
        /// </summary>
        public static PubSubConfigurationDataType Configuration(
            double publishingIntervalMs,
            IList<PublishedDataSetDataType> publishedDataSets)
        {
            var writers = new DataSetWriterDataType[publishedDataSets.Count];
            for (int i = 0; i < publishedDataSets.Count; i++)
            {
                writers[i] = new DataSetWriterDataType
                {
                    Name = "Writer" + publishedDataSets[i].Name,
                    DataSetWriterId = (ushort)(i + 1),
                    DataSetName = publishedDataSets[i].Name
                };
            }

            var writerGroup = new WriterGroupDataType
            {
                Name = "Group1",
                WriterGroupId = 1,
                PublishingInterval = publishingIntervalMs,
                DataSetWriters = writers.ToArrayOf()
            };

            var connection = new PubSubConnectionDataType
            {
                Name = "Connection1",
                WriterGroups = new[] { writerGroup }.ToArrayOf()
            };

            return new PubSubConfigurationDataType
            {
                PublishedDataSets = publishedDataSets.ToArrayOf(),
                Connections = new[] { connection }.ToArrayOf()
            };
        }

        /// <summary>
        /// Creates a connected mocked external-server session that ignores
        /// connect calls and reports itself connected.
        /// </summary>
        public static Mock<IServerSession> ConnectedSession()
        {
            var mock = new Mock<IServerSession>();
            mock.SetupGet(s => s.IsConnected).Returns(true);
            mock.Setup(s => s.ConnectAsync(It.IsAny<CancellationToken>()))
                .Returns(default(System.Threading.Tasks.ValueTask));
            mock.Setup(s => s.ResolveNodeIdAsync(
                    It.IsAny<NodeId>(), It.IsAny<CancellationToken>()))
                .Returns((NodeId node, CancellationToken _) =>
                    new System.Threading.Tasks.ValueTask<NodeId>(node));
            return mock;
        }
    }
}