using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Linq;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;
using JetBrains.Annotations;

// ReSharper disable LoopCanBeConvertedToQuery
// ReSharper disable ForCanBeConvertedToForeach

namespace ClassLibrary1
{
    public class ArrayBenchmark
    {
        private readonly ImmutableArray<int> _immutableArray;
        [NotNull] private readonly int[] _array;
        [NotNull] private readonly List<int> _list;

        public ArrayBenchmark()
        {
            var random = new Random(12345);
            var data = Enumerable.Range(0, 10000).Select(i => random.Next()).ToArray();

            _immutableArray = data.ToImmutableArray();
            _array = data.ToArray();
            _list = data.ToList();
        }

        [Benchmark]
        public int ImmutableArrayForeach()
        {
            var sum = 0;
            foreach (var i in _immutableArray)
            {
                sum += i;
            }

            return sum;
        }

        [Benchmark]
        public int ImmutableArrayFor()
        {
            var sum = 0;
            for (var i = 0; i < _immutableArray.Length; i++)
            {
                sum += _immutableArray[i];
            }

            return sum;
        }

        [Benchmark]
        public int ArrayForeach()
        {
            var sum = 0;
            foreach (var i in _array)
            {
                sum += i;
            }

            return sum;
        }

        [Benchmark]
        public int ArrayFor()
        {
            var sum = 0;
            for (var i = 0; i < _array.Length; i++)
            {
                sum += _array[i];
            }

            return sum;
        }


        [Benchmark]
        public int ListForeach()
        {
            var sum = 0;
            foreach (var i in _list)
            {
                sum += i;
            }

            return sum;
        }

        [Benchmark]
        public int ListFor()
        {
            var sum = 0;
            for (var i = 0; i < _list.Count; i++)
            {
                sum += _list[i];
            }

            return sum;
        }
    }

    public class Program
    {
        public static void Main()
        {
            BenchmarkRunner.Run<ArrayBenchmark>();
        }
    }
}