using System.Reflection;
using BenchmarkDotNet.Attributes;
using Collections.Pooled;
using Recyclable.Collections.Benchmarks.Core;

namespace Recyclable.Collections.Benchmarks.POC
{
    public enum RecyclableListPocBenchmarkType
	{
		IndexOfV1,
		IndexOfV2,
		IndexOfV3,
		IndexOfV4,
		IndexOf_PooledList,
		IndexOf,
		EnsureCapacity_ByPowOf2,
		EnsureCapacityV1_ByPowOf2,
		EnsureCapacityV2_ByPowOf2,
		EnsureCapacityV3_ByPowOf2,
	}

	[MemoryDiagnoser]
	public partial class RecyclableListPocBenchmarks : PocBenchmarkBase<RecyclableListPocBenchmarkType>
	{
		[Params(RecyclableListPocBenchmarkType.IndexOf)]
		public override RecyclableListPocBenchmarkType BenchmarkType { get => base.BenchmarkType; set => base.BenchmarkType = value; }

		// [Params(BenchmarkType.Array, BenchmarkType.List, BenchmarkType.RecyclableArrayList, BenchmarkType.RecyclableList)]
		[Params(RecyclableListPocBenchmarkType.IndexOf_PooledList)]
		public override RecyclableListPocBenchmarkType BaselineBenchmarkType { get => base.BaselineBenchmarkType; set => base.BaselineBenchmarkType = value; }

        private long[]? _testArray;
		public long[] TestObjects => _testArray ?? throw new NullReferenceException("Something is wrong and test objects are null");

		public RecyclableList<long> TestObjectsAsRecyclableList => _testRecyclableList ?? throw new NullReferenceException($"Something is wrong and {nameof(RecyclableList<long>)} is null");
		private RecyclableListIndexOfV1<long>? _testRecyclableListIndexOfV1;
		internal RecyclableListIndexOfV1<long> TestObjectsAsRecyclableListIndexOfV1 => _testRecyclableListIndexOfV1 ?? throw new NullReferenceException($"Something is wrong and {nameof(RecyclableListIndexOfV1<long>)} is null");
		private RecyclableListIndexOfV2<long>? _testRecyclableListIndexOfV2;
		private RecyclableList<long>? _testRecyclableList;
		internal RecyclableListIndexOfV2<long> TestObjectsAsRecyclableListIndexOfV2 => _testRecyclableListIndexOfV2 ?? throw new NullReferenceException($"Something is wrong and {nameof(RecyclableListIndexOfV2<long>)} is null");
		private RecyclableListIndexOfV3<long>? _testRecyclableListIndexOfV3;
		internal RecyclableListIndexOfV3<long> TestObjectsAsRecyclableListIndexOfV3 => _testRecyclableListIndexOfV3 ?? throw new NullReferenceException($"Something is wrong and {nameof(RecyclableListIndexOfV3<long>)} is null");
		private RecyclableListIndexOfV4<long>? _testRecyclableListIndexOfV4;
		internal RecyclableListIndexOfV4<long> TestObjectsAsRecyclableListIndexOfV4 => _testRecyclableListIndexOfV4 ?? throw new NullReferenceException($"Something is wrong and {nameof(RecyclableListIndexOfV4<long>)} is null");
		private PooledList<long>? _testPooledList;
		internal PooledList<long> TestPooledList => _testPooledList ?? throw new NullReferenceException($"Something is wrong and {nameof(PooledList<long>)} is null");

		private static readonly MethodInfo _ensureCapacityNewFunc;
		private static readonly MethodInfo _ensureCapacityV1Func;
		private static readonly MethodInfo _ensureCapacityV2Func;
		private static readonly MethodInfo _ensureCapacityV3Func;

		static RecyclableListPocBenchmarks()
		{
			_ensureCapacityNewFunc = typeof(RecyclableList<long>).GetMethod("EnsureCapacity", BindingFlags.Static | BindingFlags.NonPublic)
				?? throw new NullReferenceException($"Method EnsureCapacity not found in class {nameof(RecyclableList<long>)}");

			_ensureCapacityV1Func = typeof(RecyclableListV1<long>).GetMethod("EnsureCapacity", BindingFlags.Instance | BindingFlags.NonPublic)
				?? throw new NullReferenceException($"Method EnsureCapacity not found in class {nameof(RecyclableListV1<long>)}");

			_ensureCapacityV2Func = typeof(RecyclableListV2<long>).GetMethod("EnsureCapacity", BindingFlags.Static | BindingFlags.Public)
				?? throw new NullReferenceException($"Method EnsureCapacity not found in class {nameof(RecyclableListV2<long>)}");

			_ensureCapacityV3Func = typeof(RecyclableListV3<long>).GetMethod("EnsureCapacity", BindingFlags.Static | BindingFlags.NonPublic)
				?? throw new NullReferenceException($"Method EnsureCapacity not found in class {nameof(RecyclableListV3<long>)}");
		}

		public static void Run()
		{
			var benchmark = new RecyclableListPocBenchmarks();
			benchmark.Setup();
			// benchmark.RecyclableList_EnsureCapacity_ByPowOf2();
			// benchmark.RecyclableList_EnsureCapacityV1_ByPowOf2();
			// benchmark.RecyclableList_EnsureCapacityV2_ByPowOf2();
			// benchmark.RecyclableList_EnsureCapacityV3_ByPowOf2();
			// benchmark.RecyclableList_EnsureCapacity_ByBlockSize();
			// benchmark.RecyclableList_EnsureCapacityV1_ByBlockSize();
			// benchmark.RecyclableList_EnsureCapacityV2_ByBlockSize();
			// benchmark.RecyclableList_EnsureCapacityV3_ByBlockSize();
			benchmark.RecyclableList_IndexOf();
			benchmark.RecyclableList_IndexOfV1();
			benchmark.RecyclableList_IndexOfV2();
			benchmark.RecyclableList_IndexOfV3();
			benchmark.RecyclableList_IndexOfV4();
			benchmark.Cleanup();
		}

		public override void Setup()
		{
			Console.WriteLine("******* SETTING UP EXPECTED RESULTS DATA *******");
			_testArray = DataGenerator.EnumerateTestObjects(TestObjectCount);

			base.Setup();
        }

		public override void Cleanup()
		{
			_testArray = null;
			_testRecyclableList?.Dispose();
			_testRecyclableList = null;
			_testRecyclableListIndexOfV1?.Dispose();
			_testRecyclableListIndexOfV1 = null;
			_testRecyclableListIndexOfV2?.Dispose();
			_testRecyclableListIndexOfV2 = null;
			_testRecyclableListIndexOfV3?.Dispose();
			_testRecyclableListIndexOfV3 = null;
			_testRecyclableListIndexOfV4?.Dispose();
			_testRecyclableListIndexOfV4 = null;
			_testPooledList?.Dispose();
			_testPooledList = null;

			base.Cleanup();
		}

        protected override Action? GetTestMethod(RecyclableListPocBenchmarkType benchmarkType) => benchmarkType switch
            {
                RecyclableListPocBenchmarkType.IndexOfV1 => () => RecyclableList_IndexOfV1(),
                RecyclableListPocBenchmarkType.IndexOfV2 => () => RecyclableList_IndexOfV2(),
                RecyclableListPocBenchmarkType.IndexOfV3 => () => RecyclableList_IndexOfV3(),
                RecyclableListPocBenchmarkType.IndexOfV4 => () => RecyclableList_IndexOfV4(),
                RecyclableListPocBenchmarkType.IndexOf_PooledList => () => PooledList_IndexOf(),
                RecyclableListPocBenchmarkType.IndexOf => () => RecyclableList_IndexOf(),
                RecyclableListPocBenchmarkType.EnsureCapacity_ByPowOf2 => () => RecyclableList_EnsureCapacity_ByPowOf2(),
                RecyclableListPocBenchmarkType.EnsureCapacityV1_ByPowOf2 => () => RecyclableList_EnsureCapacityV1_ByPowOf2(),
                RecyclableListPocBenchmarkType.EnsureCapacityV2_ByPowOf2 => () => RecyclableList_EnsureCapacityV2_ByPowOf2(),
                RecyclableListPocBenchmarkType.EnsureCapacityV3_ByPowOf2 => () => RecyclableList_EnsureCapacityV3_ByPowOf2(),
                _ => throw CreateUnknownBenchmarkTypeException(benchmarkType),
            };

        protected override void PrepareData<T>(T benchmarkType)
        {
			base.PrepareData(benchmarkType);

            switch (BenchmarkType)
            {
                case RecyclableListPocBenchmarkType.IndexOfV1:
					_testRecyclableListIndexOfV1 = new(TestObjects, BlockSize, expectedItemsCount: TestObjectCount);
                    break;
                case RecyclableListPocBenchmarkType.IndexOfV2:
					_testRecyclableListIndexOfV2 = new(TestObjects, BlockSize, expectedItemsCount: TestObjectCount);
                    break;
                case RecyclableListPocBenchmarkType.IndexOfV3:
					_testRecyclableListIndexOfV3 = new(TestObjects, BlockSize, expectedItemsCount: TestObjectCount);
                    break;
                case RecyclableListPocBenchmarkType.IndexOfV4:
					_testRecyclableListIndexOfV4 = new(TestObjects, BlockSize, expectedItemsCount: TestObjectCount);
                    break;
                case RecyclableListPocBenchmarkType.IndexOf_PooledList:
					_testPooledList = new PooledList<long>(TestObjects, ClearMode.Auto);
                    break;
                case RecyclableListPocBenchmarkType.IndexOf:
                    _testRecyclableList = new(TestObjects, BlockSize, expectedItemsCount: TestObjectCount);
                    break;
            }
        }
    }
}