using System.Threading;
using System.Threading.Tasks;
using FlowScope.Addressables;
using FlowScope.Container;
using FlowScope.Resources;
using NUnit.Framework;

namespace FlowScope.PackageTests.EditMode
{
    public sealed class PackageSmokeTests
    {
        [Test]
        public void PackageAssemblies_CanBeReferencedFromPackageTests()
        {
            var container = new Container();
            var backend = new AddressablesResourceBackend();
            IResourceService resources = new ResourceService(new ImmediateBackend());

            container.RegisterInstance(resources);

            Assert.AreEqual("Addressables", backend.Name);
            Assert.AreSame(resources, container.Resolve<IResourceService>());

            container.Dispose();
        }

        [Test]
        public void ResourceService_LoadAsync_CanRunInsidePackageTestAssembly()
        {
            var backend = new ImmediateBackend();
            var service = new ResourceService(backend);

            using var handle = service
                .LoadAsync<TestAsset>("package-smoke", CancellationToken.None)
                .GetAwaiter()
                .GetResult();

            Assert.That(handle.Asset, Is.Not.Null);
            Assert.AreEqual(1, backend.LoadCalls);

            handle.Dispose();

            Assert.AreEqual(1, backend.ReleaseCalls);
        }

        private sealed class ImmediateBackend : IResourceBackend
        {
            public string Name => "Immediate";
            public int LoadCalls { get; private set; }
            public int ReleaseCalls { get; private set; }

            public Task<T> LoadAsync<T>(string key, CancellationToken cancellationToken)
                where T : class
            {
                LoadCalls++;
                return Task.FromResult(new TestAsset() as T);
            }

            public void Release<T>(string key, T asset)
                where T : class
            {
                ReleaseCalls++;
            }
        }

        private sealed class TestAsset
        {
        }
    }
}