using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using Unity.Burst;
using Unity.Collections.LowLevel.Unsafe;
using Unity.Jobs;
using Unity.Mathematics;

namespace Burst.Compiler.IL.Tests
{
    // TODO: We should add a lot more tests for generics
    // - instance methods with generics
    // - instance methods with generics and outer generics from declaring type
    // - check generic name collisions
    // - ...etc.
    internal partial class TestGenerics
    {
        [TestCompiler]
        public static int StructNestedGenerics()
        {
            var value = new GenericStruct<float, GenericStruct<int, int>>();
            return value.FieldMixed1.Field4.FieldMixed1.Field4;
        }

        private unsafe struct DataOutput2<TType>
            where TType : struct
        {
#pragma warning disable 0649
            internal TType m_Value;
#pragma warning restore 0649
        }

        [TestCompiler]
        public static int CheckSizeOfWithGenerics()
        {
            return UnsafeUtility.SizeOf<DataOutput2<int>>() + UnsafeUtility.SizeOf<DataOutput2<DataOutput2<GenericStruct<int, float>>>>() * 10;
        }

        [TestCompiler]
        public static float TestOuterInnerGenerics()
        {
            var yoyo = new GenericStructOuter<MyValueData1, MyValueData2>.GenericStructInner
            {
                Field1 = { Value = 1.0f },
                Field2 = { Value = 11.0f }
            };
            Executor<GenericStructOuter<MyValueData1, MyValueData2>.GenericStructInner>.Execute(ref yoyo);
            return yoyo.Result;
        }

        [TestCompiler]
        public static float TestOuterInnerGenerics2()
        {
#pragma warning disable 0649
            var yoyo = new GenericStructOuter2<MyValueData1, MyValueData2>.GenericStructInner<MyValueData2>
            {
                Field1 = { Value = 1.0f },
                Field2 = { Value = 11.0f },
                Field3 = { Value = 106.0f }
            };
#pragma warning restore 0649
            Executor<GenericStructOuter2<MyValueData1, MyValueData2>.GenericStructInner<MyValueData2>>.Execute(ref yoyo);
            return yoyo.Result;
        }

        [TestCompiler]
        public static float TestActivator()
        {
            var yoyo = new MyActivator<MyValueData1>();
            var result = yoyo.Create(1.0f);
            return result.Value;
        }

        [TestCompiler]
        public static float TestActivatorIndirect()
        {
            var yoyo = new MyActivatorIndirect<MyValueData1>();
            var result = yoyo.Create(1.0f);
            return result.Value;
        }

        [TestCompiler]
        public static float TestStaticMethodGeneric()
        {
            var v1 = new MyValueData1() { Value = 10.0f };
            var v2 = new MyValueData2() { Value = 100.0f };
            var result = ComputeData<MyValueData2, MyValueData1, MyValueData2>(v1, v2);
            return result.Value;
        }

        public interface IMyActivator<T> where T : IMyData, new()
        {
            T Create(float value);
        }

        public struct MyActivator<T> : IMyActivator<T> where T : IMyData, new()
        {
            public T Create(float value)
            {
                var data = new T { Value = value + 2.0f };
                return data;
            }
        }

        public struct MyActivatorIndirect<T> : IMyActivator<T> where T : IMyData, new()
        {
            public T Create(float value)
            {
                return CreateActivator<T>(value);
            }
        }

        public interface IMyData
        {
            float Value { get; set; }
        }

        public struct MyValueData1 : IMyData
        {
            public float Value { get; set; }
        }

        public struct MyValueData2 : IMyData
        {
            public float Value { get; set; }
        }

        private struct GenericStructOuter<T1, T2> where T1 : IMyData where T2 : IMyData
        {
            public struct GenericStructInner : IJob
            {
#pragma warning disable 0649
                public T1 Field1;

                public T2 Field2;
#pragma warning restore 0649
                public float Result;

                public void Execute()
                {
                    Result = Field1.Value + Field2.Value;
                }
            }
        }

        private struct GenericStructOuter2<T1, T2> where T1 : IMyData where T2 : IMyData
        {
            public struct GenericStructInner<T3> : IJob where T3 : IMyData
            {
#pragma warning disable 0649
                public T1 Field1;

                public T2 Field2;

                public T3 Field3;

                public float Result;
#pragma warning restore 0649
                public void Execute()
                {
                    Result = Field1.Value + Field2.Value + Field3.Value;
                }
            }
        }

        private struct Executor<T> where T : IJob
        {
            public static void Execute(ref T job)
            {
                job.Execute();
            }
        }

        private struct GenericStruct<T1, T2>
        {
#pragma warning disable 0649
            public GenericSubStruct<int, T2> FieldMixed1;

            public GenericSubStruct<T1, float> FieldMixed2;
#pragma warning restore 0649
        }

        private struct GenericSubStruct<T3, T4>
        {
#pragma warning disable 0649
            public T3 Field3;

            public T4 Field4;
#pragma warning restore 0649
        }

        public interface IRotation
        {
            float Value { get; set; }
        }

        public struct SimpleRotation : IRotation
        {
            public float Value { get; set; }
        }

        public struct SimpleRotation2 : IRotation
        {
            public float Value { get; set; }
        }

        private static TNew CreateActivator<TNew>(float value) where TNew : IMyData, new()
        {
            var data = new TNew { Value = value + 5.0f };
            return data;
        }

        private static TResult ComputeData<TResult, TLeft, TRight>(TLeft left, TRight right) where TLeft : IMyData where TRight : IMyData where TResult : IMyData, new()
        {
            var result = new TResult();
            result.Value = 5.0f;
            result.Value += left.Value;
            result.Value += right.Value;
            return result;
        }

        [TestCompiler]
        public static void TestCrossConstraints()
        {
            var job = new ReproBurstError();
            job.Execute();
        }

        struct ReproBurstError : IJob
        {
#pragma warning disable 0649
            public FirstLevel<SecondLevel<int>, int> first;
            public SecondLevel<int> second;
#pragma warning restore 0649

            public void Execute()
            {
                first.First(second, 0);
            }
        }

        [StructLayout(LayoutKind.Sequential, Size = 1)]
        struct FirstLevel<T1, T2> where T1 : struct, ISecondLevel<T2>
        {
            public void First(T1 t1, T2 t2) { t1.Second(t2); }
        }
        interface ISecondLevel<T2> { void Second(T2 x); }
        [StructLayout(LayoutKind.Sequential, Size = 1)]
        struct SecondLevel<T> : ISecondLevel<T>
        {
            public void Second(T x) { }
        }

        [TestCompiler]
        public static float TestCrossAndGenericArgumentsInGenericInterface()
        {
            var value = new CaseMixedGenerics<SimpleRotation2>.Check<CaseMixedImplem, SimpleRotation>();
            return value.Execute();
        }

        public struct CaseMixedGenerics<T1> where T1 : IRotation
        {
            public interface MyInterface<T2> where T2 : IRotation
            {
                // Here we have a test with generics coming from interface but also coming from parameters
                // through an interface method call
                float MyMethod<T>(T2 t2, T value) where T : IRotation;
            }

            public struct Check<T3, T4> where T3 : MyInterface<T4> where T4 : IRotation
            {
#pragma warning disable 0649
                private T3 t3Value;

                private T4 t4Value;
#pragma warning restore 0649

                public float Execute()
                {
                    return t3Value.MyMethod(t4Value, t4Value);
                }

                public static float Run(T1 t1, Check<T3, T4> t3t4)
                {
                    return t1.Value + t3t4.Execute();
                }
            }
        }

        [StructLayout(LayoutKind.Sequential, Size = 1)]
        public struct CaseMixedImplem : CaseMixedGenerics<SimpleRotation2>.MyInterface<SimpleRotation>
        {
            public float MyMethod<T>(SimpleRotation t2, T value) where T : IRotation
            {
                return t2.Value + value.Value;
            }
        }

        [TestCompiler]
        public static int TestCase_1059355()
        {
            var job = new ReproBurstError2();
            job.Execute();
            return job.Result;
        }

        [TestCompiler]
        public static void ExplicitInterfaceImplementation()
        {
            ExplicitRunner.RunJob(new ExplicitInterfaceStruct());
        }

        struct ReproBurstError2 : IJob
        {
#pragma warning disable 0649
            Simplified<BugRepro<Variant>.Foo> solver;

            public int Result;
#pragma warning restore 0649
            public void Execute()
            {
                Result = solver.Run(default(BugRepro<Variant>.Foo));
            }
        }

        struct Variant { }

        struct BugRepro<TVariant>
        {

            public struct Foo : IFoo
            {
                public void Bug() { }
            }
        }

        interface IFoo
        {
            void Bug();
        }

        [StructLayout(LayoutKind.Sequential, Size = 1)]
        struct Simplified<T>
            where T : IFoo
        {
            public int Run(T foo)
            {
                foo.Bug();
                foo.Bug();
                return 1;
            }
        }


        struct ExplicitInterfaceStruct : IJob
        {
            void IJob.Execute()
            {
            }
        }

        struct ExplicitRunner
        {
            public static void RunJob<T>(T job) where T : IJob
            {
                job.Execute();
            }
        }

        // case devirtualizer not working for a Physics Job
        [TestCompiler]
        public static int ExecutePhysicsJob()
        {
            var job = new PhysicsJob();
            job.Execute(0);
            return job.result ? 1 : 0;
        }

        public interface IQueryResult
        {
            float Fraction { get; set; }
        }

        // The output of ray cast queries
        public struct RayCastResult : IQueryResult
        {
            public float Fraction { get; set; }
            public float3 SurfaceNormal;
            public int RigidBodyIndex;
        }

        public interface ICollector<T> where T : struct, IQueryResult
        {
            float MaxFraction { get; }
            bool HasHit { get; }
            int NumHits { get; }
            void AddHit(T hit);
        }

        public struct AnyHitCollector<T> : ICollector<T> where T : struct, IQueryResult
        {
            public float MaxFraction { get; private set; }
            public bool HasHit { get; private set; }
            public int NumHits { get { return HasHit ? 1 : 0; } }
            public void AddHit(T hit) { HasHit = true; }
        }

        public struct ClosestHitCollector<T> : ICollector<T> where T : struct, IQueryResult
        {
            public float MaxFraction { get { return ClosestHit.Fraction; } }
            public bool HasHit { get; private set; }
            public int NumHits { get { return HasHit ? 1 : 0; } }
            public T ClosestHit;

            public void AddHit(T hit)
            {
                ClosestHit = hit;
                HasHit = true;
            }
        }

        public interface IRaycastLeafProcessor
        {
            // Cast a ray against a leaf node of the bounding volume hierarchy.
            void RayLeaf<T>(int leafData, ref T collector) where T : struct, ICollector<RayCastResult>;
        }

        static void castRay<T>(int data, ref T collector) where T : struct, ICollector<RayCastResult>
        {
            RayCastResult result = new RayCastResult();
            result.Fraction = 0.5f;
            collector.AddHit(result);
        }

        private struct RayLeafProcessor : IRaycastLeafProcessor
        {
            public void RayLeaf<T>(int leafData, ref T collector) where T : struct, ICollector<RayCastResult>
            {
                castRay(leafData, ref collector);
            }
        }

        static void processLeaves<T, U>(ref T processor, ref U collector) where T : struct, IRaycastLeafProcessor where U : struct, ICollector<RayCastResult>
        {
            for (int i = 0; i < 10; i++)
            {
                if (collector.MaxFraction > 0.5f)
                {
                    processor.RayLeaf(i, ref collector);
                }
            }
        }

        static void castRayMesh<T>(ref T collector) where T : struct, ICollector<RayCastResult>
        {
            RayLeafProcessor processor;
            processLeaves(ref processor, ref collector);
        }

        [BurstCompile]
        protected struct PhysicsJob : IJobParallelFor
        {
            public bool result;
            public unsafe void Execute(int index)
            {
                ClosestHitCollector<RayCastResult> collector = new ClosestHitCollector<RayCastResult>();
                castRayMesh(ref collector);
                result = collector.HasHit;
            }
        }

        [TestCompiler]
        public static float TestGenericIssueWithIJobProcessComponentData()
        {
            var jobProcess = new JobStruct_Process_DD<MyReadJob, GenericComponent<float>, Translation>();
            jobProcess.DataU0.Value = 5.0f;
            jobProcess.DataU1.Value = 22.0f;
            JobStruct_Process_DD<MyReadJob, GenericComponent<float>, Translation>.Execute(ref jobProcess);
            return jobProcess.DataU0.Value + jobProcess.DataU1.Value;
        }

        public interface IComponentData
        {

        }

        internal struct JobStruct_Process_DD<T, U0, U1>
            where T : struct, IJobProcessComponentData<U0, U1>
            where U0 : struct, IComponentData
            where U1 : struct, IComponentData
        {
            public T Data;

            public U0 DataU0;
            public U1 DataU1;

            public static unsafe void Execute(ref JobStruct_Process_DD<T, U0, U1> jobData)
            {
                jobData.Data.Execute(ref jobData.DataU0, ref jobData.DataU1);
            }
        }


        public interface IJobProcessComponentData<U0, U1>
            where U0 : struct, IComponentData
            where U1 : struct, IComponentData
        {
            void Execute(ref U0 c0, ref U1 c1);
        }

        public struct GenericComponent<T> : IComponentData
        {
            public T Value;
        }

        public struct Translation : IComponentData
        {
            public float Value;
        }

        struct MyReadJob : IJobProcessComponentData<GenericComponent<float>, Translation>
        {
            public void Execute(ref GenericComponent<float> c0, ref Translation c1)
            {
                c1.Value = c0.Value;
            }
        }

        public struct GenericTypeContainer<TType>
           where TType : struct
        {
            public TType Value;
        }

        [TestCompiler]
        public static int TestSizeOfWithGenericType()
        {
            return UnsafeUtility.SizeOf<GenericTypeContainer<int>>();
        }

        public class GenericContainerOuter<T>
            where T : struct
        {
            public struct GenericContainerInner<TType>
                where TType : struct
            {
                public TType Value;
                public T Value2;
            }
        }

        [TestCompiler]
        public static int TestSizeOfWithNestedGenericTypes()
        {
            return UnsafeUtility.SizeOf<GenericContainerOuter<long>.GenericContainerInner<int>>();
        }

        [TestCompiler]
        public static int CheckInterfaceCallsThroughGenericsOfGenerics()
        {
            var job = MyOuterStructWithGenerics<MyComponentData>.GetJob();
            job.Value1.Component.Value = 1;
            job.Value1.Component.Value = 2;

            job.Execute();

            return job.Result;
        }

        private interface IComponentDataOrdered
        {
            int Order { get; }
        }


        private struct EntityInChunkWithComponent<TComponent> where TComponent : struct, IComponentData
        {
            public TComponent Component;

            public EntityInChunkWithComponent(TComponent component)
            {
                Component = component;
            }
        }

        private struct EntityInChunkWithComponentComparer<TComponent> : IComparer<EntityInChunkWithComponent<TComponent>>
            where TComponent : unmanaged, IComponentData, IComparable<TComponent>

        {
            public int Compare(EntityInChunkWithComponent<TComponent> x, EntityInChunkWithComponent<TComponent> y)
            {
                return x.Component.CompareTo(y.Component);
            }
        }

        private struct MyOuterStructWithGenerics<TComponent>
            where TComponent : unmanaged, IComponentData, IComparable<TComponent>
        {

            public struct InnerWithComparer<T, TComparer> : IJob
                where T : struct
                where TComparer : struct, IComparer<T>
            {
                public T Value1;
#pragma warning disable 0649
                public T Value2;
#pragma warning restore 0649

                public int Result;

                public void Execute()
                {
                    var comparer = new TComparer();
                    Result = comparer.Compare(Value1, Value2);
                }
            }

            public static InnerWithComparer<EntityInChunkWithComponent<TComponent>, EntityInChunkWithComponentComparer<TComponent>> GetJob()
            {
                return new InnerWithComparer<EntityInChunkWithComponent<TComponent>, EntityInChunkWithComponentComparer<TComponent>>();
            }
        }

        private struct MyComponentData : IComponentData, IComparable<MyComponentData>
        {
            public int Value;

            public MyComponentData(int value)
            {
                Value = value;
            }

            public int CompareTo(MyComponentData other)
            {
                return Value.CompareTo(other.Value);
            }
        }

        [TestCompiler]
        public static long TestNestedGenericsWithStaticAndSameName()
        {
            return TypeIndexCache<float>.GetValue();
        }

        private class TypeIndexCache<T>
        {
            public static long GetValue()
            {
                return InnerIndex<int>.Create<TestGenerics, T>();
            }
        }

        private struct InnerIndex<T>
        {
            public static long Create<T1, T2>()
            {
                var value = BurstRuntime.GetHashCode64<T1>();
                value *= BurstRuntime.GetHashCode64<T2>();
                return value;
            }
        }

        // Set this to no-inlining so the compiler can't fold the branch away with anything other than type deduction.
        [MethodImpl(MethodImplOptions.NoInlining)]
        private static int GenericResolutionBranchTrick<T>()
        {
            if (default(T) is null)
            {
                return 42;
            }
            else
            {
                return 13;
            }
        }

        [TestCompiler]
        public static int TestGenericResolutionBranchTrickInt()
        {
            return GenericResolutionBranchTrick<int>();
        }

        private struct SomeStruct { }

        [TestCompiler]
        public static int TestGenericResolutionBranchTrickStruct()
        {
            return GenericResolutionBranchTrick<SomeStruct>();
        }

        private class SomeClass { }

        [TestCompiler(ExpectCompilerException = true, ExpectedDiagnosticId = DiagnosticId.ERR_InstructionBoxNotSupported)]
        public static unsafe int TestGenericResolutionBranchTrickClass()
        {
            return GenericResolutionBranchTrick<SomeClass>();
        }

        // TODO: Burst does not yet resolve the correct method
        // [TestCompiler]
        public static int TestStructImplementingGenericInterfaceWithSourceOrderDependentResolution()
        {
            var value = new StructImplementingGenericInterfaceWithSourceOrderDependentResolution();
            return CallStructImplementingGenericInterfaceWithSourceOrderDependentResolutionHelper(value, 0);
        }

        private static int CallStructImplementingGenericInterfaceWithSourceOrderDependentResolutionHelper<T, U>(T value, U u)
            where T : IGenericInterfaceWithSourceOrderDependentResolution<U>
        {
            return value.Foo(u);
        }

        private interface IGenericInterfaceWithSourceOrderDependentResolution<T>
        {
            int Foo(int i);
            int Foo(T t);
        }

        private struct StructImplementingGenericInterfaceWithSourceOrderDependentResolution : IGenericInterfaceWithSourceOrderDependentResolution<int>
        {
#pragma warning disable CS0473 // Explicit interface implementation matches more than one interface member
            int IGenericInterfaceWithSourceOrderDependentResolution<int>.Foo(int i) => 1;
#pragma warning restore CS0473 // Explicit interface implementation matches more than one interface member
            public int Foo(int i) => 2;
        }

        [TestCompiler]
        public static int TestStructImplementingGenericInterfaceWithSourceOrderDependentResolution2()
        {
            var value = new StructImplementingGenericInterfaceWithSourceOrderDependentResolution2();
            return CallStructImplementingGenericInterfaceWithSourceOrderDependentResolution2Helper(value, 0);
        }

        private static int CallStructImplementingGenericInterfaceWithSourceOrderDependentResolution2Helper<T, U>(T value, U u)
            where T : IGenericInterfaceWithSourceOrderDependentResolution2<U>
        {
            return value.Foo(u);
        }

        private interface IGenericInterfaceWithSourceOrderDependentResolution2<T>
        {
            // Inverted order from IGenericInterfaceWithSourceOrderDependentResolution<T> above
            int Foo(T t);
            int Foo(int i);
        }

        private struct StructImplementingGenericInterfaceWithSourceOrderDependentResolution2 : IGenericInterfaceWithSourceOrderDependentResolution2<int>
        {
#pragma warning disable CS0473 // Explicit interface implementation matches more than one interface member
            int IGenericInterfaceWithSourceOrderDependentResolution2<int>.Foo(int i) => 1;
#pragma warning restore CS0473 // Explicit interface implementation matches more than one interface member
            public int Foo(int i) => 2;
        }

        [TestCompiler]
#if BURST_TESTS_ONLY
        [TestHash]
#endif
        public static int CallGenericStructImplementingGenericInterfaceWithOverloads()
        {
            var value = new GenericStructImplementingGenericInterfaceWithOverloads<int>();
            return CallGenericStructImplementingGenericInterfaceWithOverloadsHelper(value);
        }

        private static int CallGenericStructImplementingGenericInterfaceWithOverloadsHelper<T>(T value)
            where T : IGenericInterfaceWithOverloads<int>
        {
            return value.Foo(0u) + value.Foo(0);
        }

        private interface IGenericInterfaceWithOverloads<T>
        {
            T Foo(uint u);
            T Foo(int i);
        }

        private struct GenericStructImplementingGenericInterfaceWithOverloads<T> : IGenericInterfaceWithOverloads<T>
        {
            public T UIntValue;
            public T IntValue;

            public T Foo(uint u) => UIntValue;

            public T Foo(int i) => IntValue;
        }

        [TestCompiler]
#if BURST_TESTS_ONLY
        [TestHash]
#endif
        public static int CallGenericStructImplementingGenericInterfaceWithOverloads2()
        {
            var value = new GenericStructImplementingGenericInterfaceWithOverloads<int>
            {
                UIntValue = 42,
                IntValue = 43,
            };
            CallGenericStructImplementingGenericInterfaceWithOverloadsHelper2(value, out int result1, out int result2);
            return result1 + result2;
        }

        private static void CallGenericStructImplementingGenericInterfaceWithOverloadsHelper2<T, U>(T value, out U result1, out U result2)
            where T : IGenericInterfaceWithOverloads<U>
        {
            result1 = value.Foo(0u);
            result2 = value.Foo(0);
        }

        [TestCompiler]
#if BURST_TESTS_ONLY
        [TestHash]
#endif
        public static int CallGenericStructImplementingGenericInterfaceWithOverloadsWrapper()
        {
            var value = new GenericStructImplementingGenericInterfaceWithOverloadsWrapper<int>
            {
                UIntValue = new GenericStructImplementingGenericInterfaceWithOverloads<int>
                {
                    UIntValue = 42,
                    IntValue = 43,
                },
                IntValue = new GenericStructImplementingGenericInterfaceWithOverloads<int>
                {
                    UIntValue = 44,
                    IntValue = 45,
                },
            };
            return CallGenericStructImplementingGenericInterfaceWithOverloadsHelperWrapper(value);
        }

        private static int CallGenericStructImplementingGenericInterfaceWithOverloadsHelperWrapper<T>(T value)
            where T : IGenericInterfaceWithOverloadsWrapper<int>
        {
            return value.Bar(0u).Foo(0u)
                + value.Bar(0u).Foo(0)
                + value.Bar(0).Foo(0u)
                + value.Bar(0).Foo(0);
        }

        [TestCompiler]
#if BURST_TESTS_ONLY
        [TestHash]
#endif
        public static int CallGenericStructImplementingGenericInterfaceWithOverloadsWrapper2()
        {
            var value = new GenericStructImplementingGenericInterfaceWithOverloadsWrapper<int>();
            CallGenericStructImplementingGenericInterfaceWithOverloadsHelperWrapper2(
                value,
                out int result1,
                out int result2,
                out int result3,
                out int result4);
            return result1 + result2 + result3 + result4;
        }

        private static void CallGenericStructImplementingGenericInterfaceWithOverloadsHelperWrapper2<T, U>(
            T value,
            out U result1,
            out U result2,
            out U result3,
            out U result4)
            where T : IGenericInterfaceWithOverloadsWrapper<U>
        {
            result1 = value.Bar(0u).Foo(0u);
            result2 = value.Bar(0u).Foo(0);
            result3 = value.Bar(0).Foo(0u);
            result4 = value.Bar(0).Foo(0);
        }

        private interface IGenericInterfaceWithOverloadsWrapper<T>
        {
            GenericStructImplementingGenericInterfaceWithOverloads<T> Bar(uint index);
            GenericStructImplementingGenericInterfaceWithOverloads<T> Bar(int index);
        }

        private struct GenericStructImplementingGenericInterfaceWithOverloadsWrapper<T> : IGenericInterfaceWithOverloadsWrapper<T>
        {
            public GenericStructImplementingGenericInterfaceWithOverloads<T> UIntValue;
            public GenericStructImplementingGenericInterfaceWithOverloads<T> IntValue;

            public GenericStructImplementingGenericInterfaceWithOverloads<T> Bar(uint index) => UIntValue;

            public GenericStructImplementingGenericInterfaceWithOverloads<T> Bar(int index) => IntValue;
        }

        // TODO: Burst does not yet resolve the correct method
        // [TestCompiler]
#if BURST_TESTS_ONLY
        [TestHash]
#endif
        public static int CallStructImplementingGenericInterfaceWithMoreSpecificOverload()
        {
            var value = new StructImplementingGenericInterfaceWithMoreSpecificOverload<int>();
            return CallStructImplementingGenericInterfaceWithMoreSpecificOverloadHelper(value);
        }

        private static int CallStructImplementingGenericInterfaceWithMoreSpecificOverloadHelper<T>(T value)
            where T : IGenericInterfaceWithMoreSpecificOverload<int>
        {
            return value.Foo(0);
        }

        private interface IGenericInterfaceWithMoreSpecificOverload<T>
        {
            int Foo(T t);
            int Foo(int i);
        }

        private struct StructImplementingGenericInterfaceWithMoreSpecificOverload<T> : IGenericInterfaceWithMoreSpecificOverload<T>
        {
            public int Foo(T t) => 1;

            public int Foo(int i) => 2;
        }

        [TestCompiler]
#if BURST_TESTS_ONLY
        [TestHash]
#endif
        public static int CallStructImplementingGenericInterfaceWithMoreSpecificOverload2()
        {
            var value = new StructImplementingGenericInterfaceWithMoreSpecificOverload2();
            return CallStructImplementingGenericInterfaceWithMoreSpecificOverload2Helper(value);
        }

        private static int CallStructImplementingGenericInterfaceWithMoreSpecificOverload2Helper<T>(T value)
            where T : IGenericInterfaceWithMoreSpecificOverload<int>
        {
            return value.Foo(0);
        }

        private struct StructImplementingGenericInterfaceWithMoreSpecificOverload2 : IGenericInterfaceWithMoreSpecificOverload<int>
        {
            public int Foo(int i) => 1;
        }

        [TestCompiler]
        public static int CallGenericStructImplementingGenericInterfaceWithPrivateOverload()
        {
            var value = new GenericStructImplementingGenericInterfaceWithPrivateOverload<int>();
            return CallGenericStructImplementingGenericInterfaceWithPrivateOverloadHelper(value);
        }

        private interface IGenericInterface<T>
        {
            T Get(int idx);
        }

        private static int CallGenericStructImplementingGenericInterfaceWithPrivateOverloadHelper<T>(T value)
            where T : IGenericInterface<int>
        {
            return value.Get(0);
        }

        private struct GenericStructImplementingGenericInterfaceWithPrivateOverload<T> : IGenericInterface<T>
        {
            private int Get(T idx) => 42;

            public T Get(int idx) => default;
        }

        [TestCompiler]
        public static int CallGenericStructImplementingGenericInterfaceDerived()
        {
            var value = new GenericStructImplementingGenericInterfaceDerived<int>();
            return CallGenericStructImplementingGenericInterfaceDerivedHelper(value);
        }

        private static int CallGenericStructImplementingGenericInterfaceDerivedHelper<T>(T value)
            where T : IGenericInterfaceDerived<int, int>
        {
            return value.Foo(0);
        }

        private interface IGenericInterfaceBase<T>
        {
            int Foo(T t);
            int Foo(double d);
        }

        private interface IGenericInterfaceDerived<T, U> : IGenericInterfaceBase<T>
        {
            int Foo(U u);
        }

        private struct GenericStructImplementingGenericInterfaceDerived<T> : IGenericInterfaceDerived<T, T>
        {
            public int Foo(T u) => 1;

            public int Foo(double d) => (int)d;
        }

        [TestCompiler]
#if BURST_TESTS_ONLY
        [TestHash]
#endif
        public static int CallBaseInterfaceMethodOnGenericStruct()
        {
            var value = new GenericStructImplementingGenericInterfaceDerived<int>();
            return CallBaseInterfaceMethodOnGenericStructHelper(value);
        }

        private static int CallBaseInterfaceMethodOnGenericStructHelper<T>(T value)
            where T : IGenericInterfaceBase<int>
        {
            return value.Foo(0);
        }

        // TODO: Burst does not yet resolve the correct method
        // [TestCompiler]
        public static int CallGenericStructImplementingGenericInterfaceDerived2()
        {
            var value = new GenericStructImplementingGenericInterfaceDerived2<int>();
            return CallGenericStructImplementingGenericInterfaceDerived2Helper<GenericStructImplementingGenericInterfaceDerived2<int>, int>(value);
        }

        private static int CallGenericStructImplementingGenericInterfaceDerived2Helper<T, U>(T value)
            where T : IGenericInterfaceDerived<U, U>
        {
            return value.Foo(default);
        }

        private struct GenericStructImplementingGenericInterfaceDerived2<T> : IGenericInterfaceDerived<T, T>
        {
            int IGenericInterfaceBase<T>.Foo(T t) => 2;

            int IGenericInterfaceBase<T>.Foo(double d) => (int)d;

            public int Foo(T u) => 1;
        }

        [TestCompiler]
#if BURST_TESTS_ONLY
        [TestHash]
#endif
        public static int CallGetHashCodeViaInterface()
        {
            return CallGetHashCodeViaInterfaceHelper(new CallGetHashCodeViaInterfaceStruct { Value = 42 });
        }

        public static int CallGetHashCodeViaInterfaceHelper<T>(T value)
        {
            return value.GetHashCode();
        }

        public struct CallGetHashCodeViaInterfaceStruct
        {
            public int Value;

            public override int GetHashCode() => Value.GetHashCode();

            public int GetHashCode(int x) => x;
        }

        [TestCompiler(ExpectCompilerException = true, ExpectedDiagnosticId = DiagnosticId.ERR_UnableToAccessManagedMethod)]
#if BURST_TESTS_ONLY
        [TestHash]
#endif
        public static int CallGetHashCodeViaInterface2()
        {
            return CallGetHashCodeViaInterfaceHelper(new CallGetHashCodeViaInterfaceStruct2 { Value = 42 });
        }

        public struct CallGetHashCodeViaInterfaceStruct2
        {
            public int Value;

            // This struct doesn't override GetHashCode, so a Burst compiler error is expected.
            // (but hashing should still succeed regardless).

            public int GetHashCode(int x) => x;

            public double GetHashCode(double d) => d;
        }

        [TestCompiler(ExpectCompilerException = true, ExpectedDiagnosticId = DiagnosticId.ERR_UnableToAccessManagedMethod)]
#if BURST_TESTS_ONLY
        [TestHash]
#endif
        public static int CallGetHashCodeViaInterface3()
        {
            return CallGetHashCodeViaInterfaceHelper(new CallGetHashCodeViaInterfaceStruct3 { Value = 42 });
        }

        public struct CallGetHashCodeViaInterfaceStruct3
        {
            public int Value;

            // This struct doesn't override GetHashCode and has no other methods with that name.
        }

#if NET7_0
        private interface IDefault
        {
            int A();

            int B() => 42;
        }

        private interface IDefaultSelfCall
        {
            int A();
            int B() => A() + 1;
        }

        private interface IDefaultGeneric<T>
        {
            public T A();
            public (U, T) B<U>() => (default, A());
        }

        private struct DefaultBasic : IDefault
        {
            public int A() => 43;
        }

        private struct DefaultImpl : IDefault
        {
            public int A() => 43;
            public int B() => 3;
        }

        private struct SelfCallDefault : IDefaultSelfCall
        {
            public int A() => 10;
        }

        private struct SelfCallImpl : IDefaultSelfCall
        {
            public int A() => 99;
            public int B() => A() * 3;
        }

        private struct DefaultGenericBasic: IDefaultGeneric<int>
        {
            public int A() => 10;
        }

        private struct DefaultGenericImpl: IDefaultGeneric<int>
        {
            public int A() => 10;

            (U, int) IDefaultGeneric<int>.B<U>() => (default, 3);
        }

        private struct DefaultVeryGenericBasic<T>: IDefaultGeneric<T>
        {
            public T A() => default;
        }

        private struct DefaultVeryGenericImpl<T>: IDefaultGeneric<T>
        {
            public T A() => default;

            (U, T) IDefaultGeneric<T>.B<U>() => (default, default);
        }

        private interface IBumper
        {
            void Bump();
        }

        private struct SelfMutator : IDefaultSelfCall, IBumper
        {
            public int X;

            public void Bump()
            {
                X = (X << 1) | 1;
            }

            public int A()
            {
                var x = X;
                Bump();
                return x;
            }
        }

        [TestCompiler]
#if BURST_TESTS_ONLY
        [TestHash]
#endif
        public static int TestDefaultInterfaceMethod()
        {
            return UseDefaultInterfaceMethodsHelper(new DefaultBasic());
        }

        [TestCompiler]
#if BURST_TESTS_ONLY
        [TestHash]
#endif
        public static int TestImplementedDefaultInterfaceMethod()
        {
            return UseDefaultInterfaceMethodsHelper(new DefaultImpl());
        }

        private static int UseDefaultInterfaceMethodsHelper<T>(T t)
            where T: IDefault
        {
            return t.B();
        }

        [TestCompiler]
#if BURST_TESTS_ONLY
        [TestHash]
#endif
        public static int TestSelfCallingDefaultInterfaceMethod()
        {
            return UseSelfCallingDefaultInterfaceMethod(new SelfCallDefault(), new SelfCallImpl());
        }

        private static int UseSelfCallingDefaultInterfaceMethod<T, U>(T t, U u)
            where T : IDefaultSelfCall
            where U : IDefaultSelfCall
        {
            return t.B() + u.B();
        }

        [TestCompiler]
#if BURST_TESTS_ONLY
        [TestHash]
#endif
        public static int TestGenericDefaultInterfaceMethod()
        {
            return UseGenericDefaultInterfaceMethod(new DefaultGenericBasic(), new DefaultGenericImpl());
        }

        private static int UseGenericDefaultInterfaceMethod<T, U>(T t, U u)
            where T : IDefaultGeneric<int>
            where U : IDefaultGeneric<int>
        {
            var (x, y) = t.B<int>();
            var (z, w) = u.B<int>();
            return (x + y) * (z + w);
        }

        [TestCompiler]
#if BURST_TESTS_ONLY
        [TestHash]
#endif
        public static int TestVeryGenericDefaultInterfaceMethod()
        {
            var ((x, y), (z, w)) = UseVeryGenericDefaultInterfaceMethod<DefaultVeryGenericBasic<int>, DefaultVeryGenericImpl<int>, int, int, long>(new DefaultVeryGenericBasic<int>(), new DefaultVeryGenericImpl<int>());
            return (int)(x + y + z + w);
        }

        private static ((W, V), (X, V)) UseVeryGenericDefaultInterfaceMethod<T, U, V, W, X>(T t, U u)
            where T : IDefaultGeneric<V>
            where U : IDefaultGeneric<V>
        {
            return (t.B<W>(), u.B<X>());
        }

        private static int UseSelfMutator<T>(ref T x) where T : IDefaultSelfCall, IBumper
        {
            x.Bump();
            var r = x.B();
            x.Bump();
            return r;
        }

        [TestCompiler]
#if BURST_TESTS_ONLY
        [TestHash]
#endif
        public static int TestSelfMutator()
        {
            var x = new SelfMutator();
            x.Bump();
            var ret = UseSelfMutator(ref x);
            x.Bump();
            return (x.X << 16) | ret;
        }

#endif
    }
}