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using System;
using System.Linq;
using Microsoft.Extensions.DependencyInjection;
using NUnit.Framework;
using Opc.Ua.Di.Server.Hosting;
using Opc.Ua.Machinery.Server;
using Opc.Ua.MachineTool.Server;
using Opc.Ua.Server.Hosting;

namespace Opc.Ua.MachineTool.Tests
{
    /// <summary>
    /// Verifies independent model selection and a single shared namespace owner.
    /// </summary>
    [TestFixture]
    public sealed class MachineToolHostingTests
    {
        /// <summary>
        /// A wireless-only registration does not claim or load MachineTool/ISA95 namespaces.
        /// </summary>
        [Test]
        public void WirelessOnlyHostingKeepsItsIndependentNamespaceClosure()
        {
            var services = new ServiceCollection();
            IOpcUaServerBuilder server = services.AddOpcUa().AddServer(options =>
                options.ApplicationName = nameof(MachineToolHostingTests));
            server.AddMachineTool(options => options.Parts = MachineToolParts.Wmtp);
            using ServiceProvider provider = services.BuildServiceProvider();
            MachineryNodeManagerFactory owner = provider.GetRequiredService<MachineryNodeManagerFactory>();

            Assert.That(owner.NamespacesUris.ToArray(), Does.Contain(WMTP.Namespaces.WMTP));
            Assert.That(owner.NamespacesUris.ToArray(), Does.Not.Contain(Namespaces.MachineTool));
            Assert.That(
                owner.NamespacesUris.ToArray(),
                Does.Not.Contain(Opc.Ua.ISA95.JobControl.V2.Namespaces.ISA95JobControlV2));
            Assert.That(services.Count(service => service.ServiceType == typeof(DiAddressSpaceOwnership)), Is.EqualTo(1));
        }

        /// <summary>
        /// Repeated composition augments the selected Machinery manager rather than registering another.
        /// </summary>
        [Test]
        public void MachineToolCompositionRetainsOneMachineryOwner()
        {
            var services = new ServiceCollection();
            IOpcUaServerBuilder server = services.AddOpcUa().AddServer(options =>
                options.ApplicationName = nameof(MachineToolHostingTests));
            server.AddMachinery(options =>
                options.Parts = MachineryParts.BuildingBlocks | MachineryParts.Jobs);
            server.AddMachineToolToMachinery();
            server.AddMachineToolToMachinery();
            using ServiceProvider provider = services.BuildServiceProvider();
            MachineryNodeManagerFactory owner = provider.GetRequiredService<MachineryNodeManagerFactory>();

            Assert.That(owner.NamespacesUris.ToArray(), Does.Contain(Namespaces.MachineTool));
            Assert.That(owner.NamespacesUris.ToArray(), Does.Not.Contain(WMTP.Namespaces.WMTP));
            Assert.That(services.Count(service => service.ServiceType == typeof(MachineryNodeManagerFactory)),
                Is.EqualTo(1));
            Assert.That(provider.GetServices<IMachineryModelProvider>().OfType<MachineToolModelProvider>().Count(),
                Is.EqualTo(1));
        }

        /// <summary>
        /// Unsupported selections are refused before any namespace owner is registered.
        /// </summary>
        [TestCase(MachineToolParts.None)]
        [TestCase((MachineToolParts)4)]
        public void InvalidModelSelectionsDoNotRegisterAnOwner(MachineToolParts parts)
        {
            var services = new ServiceCollection();
            IOpcUaServerBuilder server = services.AddOpcUa().AddServer(options =>
                options.ApplicationName = nameof(MachineToolHostingTests));

            Assert.Throws<ArgumentOutOfRangeException>(() => server.AddMachineTool(options => options.Parts = parts));

            Assert.That(services.Any(service => service.ServiceType == typeof(DiAddressSpaceOwnership)), Is.False);
        }

        /// <summary>
        /// Selected MachineTool dependencies must belong to the actual configured Machinery owner.
        /// </summary>
        [Test]
        public void CompositionRejectsAnOwnerMissingRequiredParts()
        {
            var services = new ServiceCollection();
            IOpcUaServerBuilder server = services.AddOpcUa().AddServer(options =>
                options.ApplicationName = nameof(MachineToolHostingTests));
            server.AddMachinery(options => options.Parts = MachineryParts.BuildingBlocks);
            server.AddMachineToolToMachinery();
            using ServiceProvider provider = services.BuildServiceProvider();

            ServiceResultException error = Assert.Throws<ServiceResultException>(
                () => provider.GetRequiredService<MachineryNodeManagerFactory>())!;

            Assert.That(error.StatusCode, Is.EqualTo(StatusCodes.BadConfigurationError));
        }
    }
}