using System.Collections.Generic;
using System.Linq;
using DryIoc;
using DryIoc.Microsoft.DependencyInjection;
using FluentAssertions;
using Microsoft.Extensions.DependencyInjection;
using Moq;
using NUnit.Framework;
using NzbDrone.Common;
using NzbDrone.Common.Composition.Extensions;
using NzbDrone.Common.EnvironmentInfo;
using NzbDrone.Common.Instrumentation.Extensions;
using NzbDrone.Core.Datastore.Extensions;
using NzbDrone.Core.Download;
using NzbDrone.Core.Download.TrackedDownloads;
using NzbDrone.Core.Indexers;
using NzbDrone.Core.Messaging.Commands;
using NzbDrone.Core.Messaging.Events;
using NzbDrone.Host;
using NzbDrone.SignalR;
using NzbDrone.Test.Common;
using IServiceProvider = System.IServiceProvider;

namespace NzbDrone.App.Test
{
    [TestFixture]
    public class ContainerFixture : TestBase
    {
        private IServiceProvider _container;

        [SetUp]
        public void SetUp()
        {
            var args = new StartupContext("first", "second");

            // set up a dummy broadcaster to allow tests to resolve
            var mockBroadcaster = new Mock<IBroadcastSignalRMessage>();

            var container = new Container(rules => rules.WithNzbDroneRules())
                .AutoAddServices(Bootstrap.ASSEMBLIES)
                .AddNzbDroneLogger()
                .AddDummyDatabase()
                .AddStartupContext(args);

            container.RegisterInstance<IBroadcastSignalRMessage>(mockBroadcaster.Object);

            _container = container.GetServiceProvider();
        }

        [Test]
        public void should_be_able_to_resolve_indexers()
        {
            _container.GetRequiredService<IEnumerable<IIndexer>>().Should().NotBeEmpty();
        }

        [Test]
        public void should_be_able_to_resolve_downloadclients()
        {
            _container.GetRequiredService<IEnumerable<IDownloadClient>>().Should().NotBeEmpty();
        }

        [Test]
        public void container_should_inject_itself()
        {
            var factory = _container.GetRequiredService<IServiceFactory>();

            factory.Build<IIndexerFactory>().Should().NotBeNull();
        }

        [Test]
        public void should_resolve_command_executor_by_name()
        {
            var genericExecutor = typeof(IExecute<>).MakeGenericType(typeof(RssSyncCommand));

            var executor = _container.GetRequiredService(genericExecutor);

            executor.Should().NotBeNull();
            executor.Should().BeAssignableTo<IExecute<RssSyncCommand>>();
        }

        [Test]
        public void should_return_same_instance_via_resolve_and_resolveall()
        {
            var first = (DownloadMonitoringService)_container.GetRequiredService<IHandle<TrackedDownloadsRemovedEvent>>();
            var second = _container.GetServices<IHandle<TrackedDownloadsRemovedEvent>>().OfType<DownloadMonitoringService>().Single();

            first.Should().BeSameAs(second);
        }

        [Test]
        public void should_return_same_instance_of_singletons_by_same_interface()
        {
            var first = _container.GetServices<IHandle<TrackedDownloadsRemovedEvent>>().OfType<DownloadMonitoringService>().Single();
            var second = _container.GetServices<IHandle<TrackedDownloadsRemovedEvent>>().OfType<DownloadMonitoringService>().Single();

            first.Should().BeSameAs(second);
        }

        [Test]
        public void should_return_same_instance_of_singletons_by_different_interfaces()
        {
            var first = _container.GetServices<IHandle<BookGrabbedEvent>>().OfType<DownloadMonitoringService>().Single();
            var second = (DownloadMonitoringService)_container.GetRequiredService<IExecute<RefreshMonitoredDownloadsCommand>>();

            first.Should().BeSameAs(second);
        }
    }
}