using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Microsoft.Extensions.Options;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Logging.Abstractions;
using Moq;
using NUnit.Framework;
using Umbraco.Core;
using Umbraco.Core.Cache;
using Umbraco.Core.Composing;
using Umbraco.Core.Configuration.Models;
using Umbraco.Core.Hosting;
using Umbraco.Core.IO;
using Umbraco.Core.Logging;
using Umbraco.Core.Persistence;
using Umbraco.Core.Persistence.Mappers;
using Umbraco.Core.Scoping;
using Umbraco.Tests.TestHelpers;

namespace Umbraco.Tests.UnitTests.Umbraco.Core.Components
{
    [TestFixture]
    public class ComponentTests
    {
        private static readonly List<Type> Composed = new List<Type>();
        private static readonly IIOHelper IOHelper = TestHelper.IOHelper;
        private static readonly List<Type> Initialized = new List<Type>();
        private static readonly List<Type> Terminated = new List<Type>();

        private static IFactory MockFactory(Action<Mock<IFactory>> setup = null)
        {
            // FIXME: use IUmbracoDatabaseFactory vs UmbracoDatabaseFactory, clean it all up!

            var mock = new Mock<IFactory>();
            var loggerFactory = NullLoggerFactory.Instance;
            var logger = loggerFactory.CreateLogger("GenericLogger");
            var typeFinder = TestHelper.GetTypeFinder();
            var globalSettings = new GlobalSettings();
            var connectionStrings = new ConnectionStrings();
            var f = new UmbracoDatabaseFactory(loggerFactory.CreateLogger<UmbracoDatabaseFactory>(), loggerFactory, Options.Create(globalSettings), Options.Create(connectionStrings), new Lazy<IMapperCollection>(() => new MapperCollection(Enumerable.Empty<BaseMapper>())), TestHelper.DbProviderFactoryCreator);
            var fs = new FileSystems(mock.Object, loggerFactory.CreateLogger<FileSystems>(), loggerFactory, IOHelper, Options.Create(globalSettings), Mock.Of<IHostingEnvironment>());
            var coreDebug = new CoreDebugSettings();
            var mediaFileSystem = Mock.Of<IMediaFileSystem>();
            var p = new ScopeProvider(f, fs, Options.Create(coreDebug), mediaFileSystem, loggerFactory.CreateLogger<ScopeProvider>(), loggerFactory, typeFinder, NoAppCache.Instance);

            mock.Setup(x => x.GetInstance(typeof (ILogger))).Returns(logger);
            mock.Setup(x => x.GetInstance(typeof(ILoggerFactory))).Returns(loggerFactory);
            mock.Setup(x => x.GetInstance(typeof (IProfilingLogger))).Returns(new ProfilingLogger(logger, Mock.Of<IProfiler>()));
            mock.Setup(x => x.GetInstance(typeof (IUmbracoDatabaseFactory))).Returns(f);
            mock.Setup(x => x.GetInstance(typeof (IScopeProvider))).Returns(p);

            setup?.Invoke(mock);
            return mock.Object;
        }

        private static IRegister MockRegister()
        {
            return Mock.Of<IRegister>();
        }

        private static TypeLoader MockTypeLoader()
        {
            var ioHelper = IOHelper;
            return new TypeLoader(Mock.Of<ITypeFinder>(), Mock.Of<IAppPolicyCache>(), new DirectoryInfo(ioHelper.MapPath("~/App_Data/TEMP")), Mock.Of<ILogger<TypeLoader>>(), Mock.Of<IProfilingLogger>());
        }



        [Test]
        public void Boot1A()
        {
            var register = MockRegister();
            var typeLoader = MockTypeLoader();
            var composition = new Composition(register, MockTypeLoader(), Mock.Of<IProfilingLogger>(), Mock.Of<IRuntimeState>(), IOHelper, AppCaches.NoCache);

            var types = TypeArray<Composer1, Composer2, Composer3, Composer4>();
            var composers = new Composers(composition, types, Enumerable.Empty<Attribute>(), Mock.Of<ILogger<Composers>>(), Mock.Of<IProfilingLogger>());
            Composed.Clear();
            // 2 is Core and requires 4
            // 3 is User - goes away with RuntimeLevel.Unknown
            // => reorder components accordingly
            composers.Compose();
            AssertTypeArray(TypeArray<Composer1, Composer4, Composer2>(), Composed);

            var factory = MockFactory(m =>
            {
                m.Setup(x => x.TryGetInstance(It.Is<Type>(t => t == typeof(ISomeResource)))).Returns(() => new SomeResource());
                m.Setup(x => x.GetInstance(It.IsAny<Type>())).Returns<Type>((type) =>
                {
                    if (type == typeof(Composer1)) return new Composer1();
                    if (type == typeof(Composer5)) return new Composer5();
                    if (type == typeof(Component5)) return new Component5(new SomeResource());
                    if (type == typeof(IProfilingLogger)) return new ProfilingLogger(Mock.Of<ILogger>(), Mock.Of<IProfiler>());
                    if (type == typeof(ILogger<ComponentCollection>)) return Mock.Of<ILogger<ComponentCollection>>();
                    throw new NotSupportedException(type.FullName);
                });
            });

            var builder = composition.WithCollectionBuilder<ComponentCollectionBuilder>();
            builder.RegisterWith(register);
            var components = builder.CreateCollection(factory);

            Assert.IsEmpty(components);
            components.Initialize();
            Assert.IsEmpty(Initialized);
            components.Terminate();
            Assert.IsEmpty(Terminated);
        }

        [Test]
        public void Boot1B()
        {
            var register = MockRegister();
            var composition = new Composition(register, MockTypeLoader(), Mock.Of<IProfilingLogger>(), Mock.Of<IRuntimeState>(x=>x.Level == RuntimeLevel.Run), IOHelper, AppCaches.NoCache);

            var types = TypeArray<Composer1, Composer2, Composer3, Composer4>();
            var composers = new Composers(composition, types, Enumerable.Empty<Attribute>(), Mock.Of<ILogger<Composers>>(), Mock.Of<IProfilingLogger>());
            Composed.Clear();
            // 2 is Core and requires 4
            // 3 is User - stays with RuntimeLevel.Run
            // => reorder components accordingly
            composers.Compose();
            AssertTypeArray(TypeArray<Composer1, Composer4, Composer2, Composer3>(), Composed);
        }

        [Test]
        public void Boot2()
        {
            var register = MockRegister();
            var composition = new Composition(register, MockTypeLoader(), Mock.Of<IProfilingLogger>(), Mock.Of<IRuntimeState>(), IOHelper, AppCaches.NoCache);

            var types = TypeArray<Composer20, Composer21>();
            var composers = new Composers(composition, types, Enumerable.Empty<Attribute>(), Mock.Of<ILogger<Composers>>(), Mock.Of<IProfilingLogger>());
            Composed.Clear();
            // 21 is required by 20
            // => reorder components accordingly
            composers.Compose();
            AssertTypeArray(TypeArray<Composer21, Composer20>(), Composed);
        }

        [Test]
        public void Boot3()
        {
            var register = MockRegister();
            var composition = new Composition(register, MockTypeLoader(), Mock.Of<IProfilingLogger>(), Mock.Of<IRuntimeState>(), IOHelper, AppCaches.NoCache);

            var types = TypeArray<Composer22, Composer24, Composer25>();
            var composers = new Composers(composition, types, Enumerable.Empty<Attribute>(), Mock.Of<ILogger<Composers>>(), Mock.Of<IProfilingLogger>());
            Composed.Clear();
            // i23 requires 22
            // 24, 25 implement i23
            // 25 required by i23
            // => reorder components accordingly
            composers.Compose();
            AssertTypeArray(TypeArray<Composer22, Composer25, Composer24>(), Composed);
        }

        [Test]
        public void BrokenRequire()
        {
            var register = MockRegister();
            var composition = new Composition(register, MockTypeLoader(), Mock.Of<IProfilingLogger>(), Mock.Of<IRuntimeState>(), IOHelper, AppCaches.NoCache);

            var types = TypeArray<Composer1, Composer2, Composer3>();
            var composers = new Composers(composition, types, Enumerable.Empty<Attribute>(), Mock.Of<ILogger<Composers>>(), Mock.Of<IProfilingLogger>());
            Composed.Clear();
            try
            {
                // 2 is Core and requires 4
                // 4 is missing
                // => throw
                composers.Compose();
                Assert.Fail("Expected exception.");
            }
            catch (Exception e)
            {
                Assert.AreEqual("Broken composer dependency: Umbraco.Tests.UnitTests.Umbraco.Core.Components.ComponentTests+Composer2 -> Umbraco.Tests.UnitTests.Umbraco.Core.Components.ComponentTests+Composer4.", e.Message);
            }
        }

        [Test]
        public void BrokenRequired()
        {
            var register = MockRegister();
            var composition = new Composition(register, MockTypeLoader(), Mock.Of<IProfilingLogger>(), Mock.Of<IRuntimeState>(), IOHelper, AppCaches.NoCache);

            var types = TypeArray<Composer2, Composer4, Composer13>();
            var composers = new Composers(composition, types, Enumerable.Empty<Attribute>(), Mock.Of<ILogger<Composers>>(), Mock.Of<IProfilingLogger>());
            Composed.Clear();
            // 2 is Core and requires 4
            // 13 is required by 1
            // 1 is missing
            // => reorder components accordingly
            composers.Compose();
            AssertTypeArray(TypeArray<Composer4, Composer2, Composer13>(), Composed);
        }

        [Test]
        public void Initialize()
        {
            Composed.Clear();
            Initialized.Clear();
            Terminated.Clear();

            var register = MockRegister();
            var typeLoader = MockTypeLoader();
            var factory = MockFactory(m =>
            {
                m.Setup(x => x.TryGetInstance(It.Is<Type>(t => t == typeof (ISomeResource)))).Returns(() => new SomeResource());
                m.Setup(x => x.GetInstance(It.IsAny<Type>())).Returns<Type>((type) =>
                {
                    if (type == typeof(Composer1)) return new Composer1();
                    if (type == typeof(Composer5)) return new Composer5();
                    if (type == typeof(Composer5a)) return new Composer5a();
                    if (type == typeof(Component5)) return new Component5(new SomeResource());
                    if (type == typeof(Component5a)) return new Component5a();
                    if (type == typeof(IProfilingLogger)) return new ProfilingLogger(Mock.Of<ILogger>(), Mock.Of<IProfiler>());
                    if (type == typeof(ILogger<ComponentCollection>)) return Mock.Of<ILogger<ComponentCollection>>();
                    throw new NotSupportedException(type.FullName);
                });
            });
            var composition = new Composition(register, MockTypeLoader(), Mock.Of<IProfilingLogger>(), Mock.Of<IRuntimeState>(), IOHelper, AppCaches.NoCache);

            var types = new[] { typeof(Composer1), typeof(Composer5), typeof(Composer5a) };
            var composers = new Composers(composition, types, Enumerable.Empty<Attribute>(), Mock.Of<ILogger<Composers>>(), Mock.Of<IProfilingLogger>());

            Assert.IsEmpty(Composed);
            composers.Compose();
            AssertTypeArray(TypeArray<Composer1, Composer5, Composer5a>(), Composed);

            var builder = composition.WithCollectionBuilder<ComponentCollectionBuilder>();
            builder.RegisterWith(register);
            var components = builder.CreateCollection(factory);

            Assert.IsEmpty(Initialized);
            components.Initialize();
            AssertTypeArray(TypeArray<Component5, Component5a>(), Initialized);

            Assert.IsEmpty(Terminated);
            components.Terminate();
            AssertTypeArray(TypeArray<Component5a, Component5>(), Terminated);
        }

        [Test]
        public void Requires1()
        {
            var register = MockRegister();
            var composition = new Composition(register, MockTypeLoader(), Mock.Of<IProfilingLogger>(), Mock.Of<IRuntimeState>(), IOHelper, AppCaches.NoCache);

            var types = new[] { typeof(Composer6), typeof(Composer7), typeof(Composer8) };
            var composers = new Composers(composition, types, Enumerable.Empty<Attribute>(), Mock.Of<ILogger<Composers>>(), Mock.Of<IProfilingLogger>());
            Composed.Clear();
            composers.Compose();
            Assert.AreEqual(2, Composed.Count);
            Assert.AreEqual(typeof(Composer6), Composed[0]);
            Assert.AreEqual(typeof(Composer8), Composed[1]);
        }

        [Test]
        public void Requires2A()
        {
            var register = MockRegister();
            var composition = new Composition(register, MockTypeLoader(), Mock.Of<IProfilingLogger>(), Mock.Of<IRuntimeState>(), IOHelper, AppCaches.NoCache);

            var types = new[] { typeof(Composer9), typeof(Composer2), typeof(Composer4) };
            var composers = new Composers(composition, types, Enumerable.Empty<Attribute>(), Mock.Of<ILogger<Composers>>(), Mock.Of<IProfilingLogger>());
            Composed.Clear();
            composers.Compose();
            Assert.AreEqual(2, Composed.Count);
            Assert.AreEqual(typeof(Composer4), Composed[0]);
            Assert.AreEqual(typeof(Composer2), Composed[1]);
            //Assert.AreEqual(typeof(Component9), Composed[2]); -- goes away with RuntimeLevel.Unknown
        }

        [Test]
        public void Requires2B()
        {
            var register = MockRegister();
            var typeLoader = MockTypeLoader();
            var factory = MockFactory();
            var composition = new Composition(register, MockTypeLoader(), Mock.Of<IProfilingLogger>(), Mock.Of<IRuntimeState>(x=>x.Level == RuntimeLevel.Run), IOHelper, AppCaches.NoCache);

            var types = new[] { typeof(Composer9), typeof(Composer2), typeof(Composer4) };
            var composers = new Composers(composition, types, Enumerable.Empty<Attribute>(), Mock.Of<ILogger<Composers>>(), Mock.Of<IProfilingLogger>());
            Composed.Clear();
            composers.Compose();
            var builder = composition.WithCollectionBuilder<ComponentCollectionBuilder>();
            builder.RegisterWith(register);
            var components = builder.CreateCollection(factory);
            Assert.AreEqual(3, Composed.Count);
            Assert.AreEqual(typeof(Composer4), Composed[0]);
            Assert.AreEqual(typeof(Composer2), Composed[1]);
            Assert.AreEqual(typeof(Composer9), Composed[2]);
        }

        [Test]
        public void WeakDependencies()
        {
            var register = MockRegister();
            var composition = new Composition(register, MockTypeLoader(), Mock.Of<IProfilingLogger>(), Mock.Of<IRuntimeState>(), IOHelper, AppCaches.NoCache);

            var types = new[] { typeof(Composer10) };
            var composers = new Composers(composition, types, Enumerable.Empty<Attribute>(), Mock.Of<ILogger<Composers>>(), Mock.Of<IProfilingLogger>());
            Composed.Clear();
            composers.Compose();
            Assert.AreEqual(1, Composed.Count);
            Assert.AreEqual(typeof(Composer10), Composed[0]);

            types = new[] { typeof(Composer11) };
            composers = new Composers(composition, types, Enumerable.Empty<Attribute>(), Mock.Of<ILogger<Composers>>(), Mock.Of<IProfilingLogger>());
            Composed.Clear();
            Assert.Throws<Exception>(() => composers.Compose());
            Console.WriteLine("throws:");
            composers = new Composers(composition, types, Enumerable.Empty<Attribute>(), Mock.Of<ILogger<Composers>>(), Mock.Of<IProfilingLogger>());
            var requirements = composers.GetRequirements(false);
            Console.WriteLine(Composers.GetComposersReport(requirements));

            types = new[] { typeof(Composer2) };
            composers = new Composers(composition, types, Enumerable.Empty<Attribute>(), Mock.Of<ILogger<Composers>>(), Mock.Of<IProfilingLogger>());
            Composed.Clear();
            Assert.Throws<Exception>(() => composers.Compose());
            Console.WriteLine("throws:");
            composers = new Composers(composition, types, Enumerable.Empty<Attribute>(), Mock.Of<ILogger<Composers>>(), Mock.Of<IProfilingLogger>());
            requirements = composers.GetRequirements(false);
            Console.WriteLine(Composers.GetComposersReport(requirements));

            types = new[] { typeof(Composer12) };
            composers = new Composers(composition, types, Enumerable.Empty<Attribute>(), Mock.Of<ILogger<Composers>>(), Mock.Of<IProfilingLogger>());
            Composed.Clear();
            composers.Compose();
            Assert.AreEqual(1, Composed.Count);
            Assert.AreEqual(typeof(Composer12), Composed[0]);
        }

        [Test]
        public void DisableMissing()
        {
            var register = MockRegister();
            var composition = new Composition(register, MockTypeLoader(), Mock.Of<IProfilingLogger>(), Mock.Of<IRuntimeState>(), IOHelper, AppCaches.NoCache);

            var types = new[] { typeof(Composer6), typeof(Composer8) }; // 8 disables 7 which is not in the list
            var composers = new Composers(composition, types, Enumerable.Empty<Attribute>(), Mock.Of<ILogger<Composers>>(), Mock.Of<IProfilingLogger>());
            Composed.Clear();
            composers.Compose();
            Assert.AreEqual(2, Composed.Count);
            Assert.AreEqual(typeof(Composer6), Composed[0]);
            Assert.AreEqual(typeof(Composer8), Composed[1]);
        }

        [Test]
        public void AttributesPriorities()
        {
            var register = MockRegister();
            var composition = new Composition(register, MockTypeLoader(), Mock.Of<IProfilingLogger>(), Mock.Of<IRuntimeState>(), IOHelper, AppCaches.NoCache);

            var types = new[] { typeof(Composer26) };
            var enableDisableAttributes = new[] { new DisableComposerAttribute(typeof(Composer26)) };
            var composers = new Composers(composition, types, enableDisableAttributes, Mock.Of<ILogger<Composers>>(), Mock.Of<IProfilingLogger>());
            Composed.Clear();
            composers.Compose();
            Assert.AreEqual(0, Composed.Count); // 26 gone

            types = new[] { typeof(Composer26), typeof(Composer27) }; // 26 disabled by assembly attribute, enabled by 27
            composers = new Composers(composition, types, enableDisableAttributes, Mock.Of<ILogger<Composers>>(), Mock.Of<IProfilingLogger>());
            Composed.Clear();
            composers.Compose();
            Assert.AreEqual(2, Composed.Count); // both
            Assert.AreEqual(typeof(Composer26), Composed[0]);
            Assert.AreEqual(typeof(Composer27), Composed[1]);
        }

        [Test]
        public void AllComposers()
        {
            var ioHelper = IOHelper;
            var typeFinder = TestHelper.GetTypeFinder();
            var typeLoader = new TypeLoader(typeFinder, AppCaches.Disabled.RuntimeCache, new DirectoryInfo(ioHelper.MapPath("~/App_Data/TEMP")), Mock.Of<ILogger<TypeLoader>>(), Mock.Of<IProfilingLogger>());

            var register = MockRegister();
            var composition = new Composition(register, typeLoader, Mock.Of<IProfilingLogger>(),
                Mock.Of<IRuntimeState>(), IOHelper, AppCaches.NoCache);

            var allComposers = typeLoader.GetTypes<IComposer>().ToList();
            var types = allComposers.Where(x => x.FullName.StartsWith("Umbraco.Core.") || x.FullName.StartsWith("Umbraco.Web")).ToList();
            var composers = new Composers(composition, types, Enumerable.Empty<Attribute>(), Mock.Of<ILogger<Composers>>(), Mock.Of<IProfilingLogger>());
            var requirements = composers.GetRequirements();
            var report = Composers.GetComposersReport(requirements);
            Console.WriteLine(report);
            var composerTypes = composers.SortComposers(requirements);

            foreach (var type in composerTypes)
                Console.WriteLine(type);
        }

        #region Compothings

        public class TestComposerBase : IComposer
        {
            public virtual void Compose(Composition composition)
            {
                Composed.Add(GetType());
            }
        }

        public class Composer1 : TestComposerBase
        { }

        [ComposeAfter(typeof(Composer4))]
        public class Composer2 : TestComposerBase, ICoreComposer
        { }

        public class Composer3 : TestComposerBase, IUserComposer
        { }

        public class Composer4 : TestComposerBase
        { }

        public class Composer5 : TestComposerBase
        {
            public override void Compose(Composition composition)
            {
                base.Compose(composition);
                composition.Components().Append<Component5>();
            }
        }

        [ComposeAfter(typeof(Composer5))]
        public class Composer5a : TestComposerBase
        {
            public override void Compose(Composition composition)
            {
                base.Compose(composition);
                composition.Components().Append<Component5a>();
            }
        }

        public class TestComponentBase : IComponent
        {
            public virtual void Initialize()
            {
                Initialized.Add(GetType());
            }

            public virtual void Terminate()
            {
                Terminated.Add(GetType());
            }
        }

        public class Component5 : TestComponentBase
        {
            private readonly ISomeResource _resource;

            public Component5(ISomeResource resource)
            {
                _resource = resource;
            }
        }

        public class Component5a : TestComponentBase
        { }

        [Disable]
        public class Composer6 : TestComposerBase
        { }

        public class Composer7 : TestComposerBase
        { }

        [Disable(typeof(Composer7))]
        [Enable(typeof(Composer6))]
        public class Composer8 : TestComposerBase
        { }

        public interface ITestComposer : IUserComposer
        { }

        public class Composer9 : TestComposerBase, ITestComposer
        { }

        [ComposeAfter(typeof(ITestComposer))]
        public class Composer10 : TestComposerBase
        { }

        [ComposeAfter(typeof(ITestComposer), false)]
        public class Composer11 : TestComposerBase
        { }

        [ComposeAfter(typeof(Composer4), true)]
        public class Composer12 : TestComposerBase, ICoreComposer
        { }

        [ComposeBefore(typeof(Composer1))]
        public class Composer13 : TestComposerBase
        { }

        public interface ISomeResource { }

        public class SomeResource : ISomeResource { }

        public class Composer20 : TestComposerBase
        { }

        [ComposeBefore(typeof(Composer20))]
        public class Composer21 : TestComposerBase
        { }

        public class Composer22 : TestComposerBase
        { }

        [ComposeAfter(typeof(Composer22))]
        public interface IComposer23 : IComposer
        { }

        public class Composer24 : TestComposerBase, IComposer23
        { }

        // should insert itself between 22 and anything i23
        [ComposeBefore(typeof(IComposer23))]
        //[RequireComponent(typeof(Component22))] - not needed, implement i23
        public class Composer25 : TestComposerBase, IComposer23
        { }

        public class Composer26 : TestComposerBase
        { }

        [Enable(typeof(Composer26))]
        public class Composer27 : TestComposerBase
        { }

        #endregion

        #region TypeArray

        // FIXME: move to Testing

        private static Type[] TypeArray<T1>()
        {
            return new[] { typeof(T1) };
        }

        private static Type[] TypeArray<T1, T2>()
        {
            return new[] { typeof(T1), typeof(T2) };
        }

        private static Type[] TypeArray<T1, T2, T3>()
        {
            return new[] { typeof(T1), typeof(T2), typeof(T3) };
        }

        private static Type[] TypeArray<T1, T2, T3, T4>()
        {
            return new[] { typeof(T1), typeof(T2), typeof(T3), typeof(T4) };
        }

        private static Type[] TypeArray<T1, T2, T3, T4, T5>()
        {
            return new[] { typeof(T1), typeof(T2), typeof(T3), typeof(T4), typeof(T5) };
        }

        private static Type[] TypeArray<T1, T2, T3, T4, T5, T6>()
        {
            return new[] { typeof(T1), typeof(T2), typeof(T3), typeof(T4), typeof(T5), typeof(T6) };
        }

        private static Type[] TypeArray<T1, T2, T3, T4, T5, T6, T7>()
        {
            return new[] { typeof(T1), typeof(T2), typeof(T3), typeof(T4), typeof(T5), typeof(T6), typeof(T7) };
        }

        private static Type[] TypeArray<T1, T2, T3, T4, T5, T6, T7, T8>()
        {
            return new[] { typeof(T1), typeof(T2), typeof(T3), typeof(T4), typeof(T5), typeof(T6), typeof(T7), typeof(T8) };
        }

        private static void AssertTypeArray(IReadOnlyList<Type> expected, IReadOnlyList<Type> test)
        {
            Assert.AreEqual(expected.Count, test.Count);
            for (var i = 0; i < expected.Count; i++)
                Assert.AreEqual(expected[i], test[i]);
        }

        #endregion
    }
}