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using System.Threading.Tasks;
using NUnit.Framework;
using Opc.Ua.Machinery.Server;
using Opc.Ua.Tests;

namespace Opc.Ua.Machinery.Tests
{
    /// <summary>
    /// Pins what a Machinery node manager actually loads and publishes.
    /// </summary>
    [TestFixture]
    [Category("Machinery")]
    public sealed class MachineryModelLoadingTests
    {
        [Test]
        public void TypeSystemLoadsEveryPart()
        {
            ITelemetryContext telemetry = NUnitTelemetryContext.Create(true);
            ServiceMessageContext messageContext = ServiceMessageContext.Create(telemetry);
            messageContext.NamespaceUris.Append(Opc.Ua.Di.Namespaces.OpcUaDi);
            ArrayOf<string> modelNamespaces =
                MachineryServer.GetNamespaceUris(MachineryParts.All);
            for (int ii = 0; ii < modelNamespaces.Count; ii++)
            {
                messageContext.NamespaceUris.Append(modelNamespaces[ii]);
            }
            var context = new SystemContext(telemetry)
            {
                NamespaceUris = messageContext.NamespaceUris,
                EncodeableFactory = messageContext.Factory
            };
            var nodes = new NodeStateCollection();
            int added = nodes.AddMachineryTypeSystem(context, MachineryParts.All);

            Assert.That(added, Is.GreaterThan(0));
            Assert.That(nodes, Has.Count.GreaterThan(added), "DI must be loaded as well.");
        }

        [Test]
        public void ResultPartLoadsWithoutDeviceIntegration()
        {
            Assert.That(
                MachineryServer.RequiresDeviceIntegration(MachineryParts.Result),
                Is.False,
                "OPC 40001-101 needs UA core only.");
            Assert.That(
                MachineryServer.RequiresDeviceIntegration(MachineryParts.Jobs),
                Is.False,
                "OPC 40001-3 needs ISA-95 Job Control V2 only.");
            Assert.That(
                MachineryServer.RequiresDeviceIntegration(MachineryParts.BuildingBlocks),
                Is.True);
        }

        [Test]
        public void NamespacesFollowTheSelectedParts()
        {
            ArrayOf<string> buildingBlocks =
                MachineryServer.GetNamespaceUris(MachineryParts.BuildingBlocks);
            Assert.That(buildingBlocks.ToArray(), Contains.Item(Namespaces.Machinery));
            Assert.That(buildingBlocks.ToArray(), Contains.Item(Opc.Ua.IA.Namespaces.IA));

            ArrayOf<string> result = MachineryServer.GetNamespaceUris(MachineryParts.Result);
            Assert.That(
                result.ToArray(),
                Is.EqualTo(
                    new[] { Opc.Ua.Machinery.Result.Namespaces.MachineryResult }));
        }

        [Test]
        public void ProcessValuesWithoutBuildingBlocksIsRejected()
        {
            var options = new MachineryServerOptions { Parts = MachineryParts.ProcessValues };
            ServiceResultException exception =
                Assert.Throws<ServiceResultException>(options.Validate)!;
            Assert.That(exception.Message, Does.Contain("BuildingBlocks"));
        }

        [Test]
        public void InstanceNamespaceMustNotBeAModelNamespace()
        {
            var options = new MachineryServerOptions
            {
                InstanceNamespaceUri = Namespaces.Machinery
            };
            Assert.Throws<ServiceResultException>(options.Validate);
        }

        [Test]
        public async Task ManagerPublishesTheMachinesFolder()
        {
            await using var fixture = new MachineryServerFixture();
            await fixture.StartAsync();

            var machinesId = NodeId.Create(
                Objects.Machines,
                Namespaces.Machinery,
                fixture.Manager.Server.NamespaceUris);
            NodeState? machines = fixture.Manager.FindPredefinedNode(machinesId);

            Assert.That(machines, Is.Not.Null);
            Assert.That(machines!.BrowseName.Name, Is.EqualTo(BrowseNames.Machines));
        }

        [Test]
        public async Task ManagerAdvertisesFindMachinesOnce()
        {
            await using var fixture = new MachineryServerFixture();
            await fixture.StartAsync();

            QualifiedName[] units = [.. fixture.Manager.ConformanceUnits];
            Assert.That(units, Contains.Item(new QualifiedName("Machinery Find Machines")));
            Assert.That(
                units,
                Has.No.Member(new QualifiedName("Machinery Machine Identification")),
                "A unit must not be advertised before its structure exists.");
        }
    }
}