// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the Apache 2.0 License.
// See the LICENSE file in the project root for more information. 

using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;

namespace System.Linq
{
    public static partial class AsyncEnumerable
    {
        public static Task<int> Max(this IAsyncEnumerable<int> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(new Func<int, int, int>(Math.Max), CancellationToken.None);
        }

        public static Task<int> Max(this IAsyncEnumerable<int> source, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(new Func<int, int, int>(Math.Max), cancellationToken);
        }

        public static Task<int> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, int> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(CancellationToken.None);
        }

        public static Task<int> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, int> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(cancellationToken);
        }

        public static Task<int> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<int>> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(CancellationToken.None);
        }

        public static Task<int> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<int>> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(cancellationToken);
        }

        public static Task<long> Max(this IAsyncEnumerable<long> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(new Func<long, long, long>(Math.Max), CancellationToken.None);
        }

        public static Task<long> Max(this IAsyncEnumerable<long> source, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(new Func<long, long, long>(Math.Max), cancellationToken);
        }

        public static Task<long> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, long> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(CancellationToken.None);
        }

        public static Task<long> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, long> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(cancellationToken);
        }

        public static Task<long> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<long>> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(CancellationToken.None);
        }

        public static Task<long> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<long>> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(cancellationToken);
        }

        public static Task<float> Max(this IAsyncEnumerable<float> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(new Func<float, float, float>(Math.Max), CancellationToken.None);
        }

        public static Task<float> Max(this IAsyncEnumerable<float> source, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(new Func<float, float, float>(Math.Max), cancellationToken);
        }

        public static Task<float> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, float> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(CancellationToken.None);
        }

        public static Task<float> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, float> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(cancellationToken);
        }

        public static Task<float> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<float>> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(CancellationToken.None);
        }

        public static Task<float> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<float>> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(cancellationToken);
        }

        public static Task<double> Max(this IAsyncEnumerable<double> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(new Func<double, double, double>(Math.Max), CancellationToken.None);
        }

        public static Task<double> Max(this IAsyncEnumerable<double> source, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(new Func<double, double, double>(Math.Max), cancellationToken);
        }

        public static Task<double> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, double> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(CancellationToken.None);
        }

        public static Task<double> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, double> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(cancellationToken);
        }

        public static Task<double> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<double>> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(CancellationToken.None);
        }

        public static Task<double> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<double>> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(cancellationToken);
        }

        public static Task<decimal> Max(this IAsyncEnumerable<decimal> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(new Func<decimal, decimal, decimal>(Math.Max), CancellationToken.None);
        }

        public static Task<decimal> Max(this IAsyncEnumerable<decimal> source, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(new Func<decimal, decimal, decimal>(Math.Max), cancellationToken);
        }

        public static Task<decimal> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, decimal> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(CancellationToken.None);
        }

        public static Task<decimal> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, decimal> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(cancellationToken);
        }

        public static Task<decimal> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<decimal>> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(CancellationToken.None);
        }

        public static Task<decimal> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<decimal>> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(cancellationToken);
        }

        public static Task<int?> Max(this IAsyncEnumerable<int?> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(default(int?), new Func<int?, int?, int?>(NullableMax), CancellationToken.None);
        }

        public static Task<int?> Max(this IAsyncEnumerable<int?> source, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(default(int?), new Func<int?, int?, int?>(NullableMax), cancellationToken);
        }

        public static Task<int?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, int?> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(CancellationToken.None);
        }

        public static Task<int?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, int?> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(cancellationToken);
        }

        public static Task<int?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<int?>> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(CancellationToken.None);
        }

        public static Task<int?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<int?>> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(cancellationToken);
        }

        public static Task<long?> Max(this IAsyncEnumerable<long?> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(default(long?), new Func<long?, long?, long?>(NullableMax), CancellationToken.None);
        }

        public static Task<long?> Max(this IAsyncEnumerable<long?> source, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(default(long?), new Func<long?, long?, long?>(NullableMax), cancellationToken);
        }

        public static Task<long?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, long?> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(CancellationToken.None);
        }

        public static Task<long?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, long?> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(cancellationToken);
        }

        public static Task<long?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<long?>> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(CancellationToken.None);
        }

        public static Task<long?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<long?>> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(cancellationToken);
        }

        public static Task<float?> Max(this IAsyncEnumerable<float?> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(default(float?), new Func<float?, float?, float?>(NullableMax), CancellationToken.None);
        }

        public static Task<float?> Max(this IAsyncEnumerable<float?> source, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(default(float?), new Func<float?, float?, float?>(NullableMax), cancellationToken);
        }

        public static Task<float?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, float?> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(CancellationToken.None);
        }

        public static Task<float?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, float?> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(cancellationToken);
        }

        public static Task<float?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<float?>> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(CancellationToken.None);
        }

        public static Task<float?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<float?>> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(cancellationToken);
        }

        public static Task<double?> Max(this IAsyncEnumerable<double?> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(default(double?), new Func<double?, double?, double?>(NullableMax), CancellationToken.None);
        }

        public static Task<double?> Max(this IAsyncEnumerable<double?> source, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(default(double?), new Func<double?, double?, double?>(NullableMax), cancellationToken);
        }

        public static Task<double?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, double?> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(CancellationToken.None);
        }

        public static Task<double?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, double?> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(cancellationToken);
        }

        public static Task<double?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<double?>> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(CancellationToken.None);
        }

        public static Task<double?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<double?>> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(cancellationToken);
        }

        public static Task<decimal?> Max(this IAsyncEnumerable<decimal?> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(default(decimal?), new Func<decimal?, decimal?, decimal?>(NullableMax), CancellationToken.None);
        }

        public static Task<decimal?> Max(this IAsyncEnumerable<decimal?> source, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(default(decimal?), new Func<decimal?, decimal?, decimal?>(NullableMax), cancellationToken);
        }

        public static Task<decimal?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, decimal?> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(CancellationToken.None);
        }

        public static Task<decimal?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, decimal?> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(cancellationToken);
        }

        public static Task<decimal?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<decimal?>> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(CancellationToken.None);
        }

        public static Task<decimal?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<decimal?>> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Max(cancellationToken);
        }

        public static Task<int> Min(this IAsyncEnumerable<int> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(new Func<int, int, int>(Math.Min), CancellationToken.None);
        }

        public static Task<int> Min(this IAsyncEnumerable<int> source, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(new Func<int, int, int>(Math.Min), cancellationToken);
        }

        public static Task<int> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, int> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(CancellationToken.None);
        }

        public static Task<int> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, int> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(cancellationToken);
        }

        public static Task<int> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<int>> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(CancellationToken.None);
        }

        public static Task<int> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<int>> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(cancellationToken);
        }

        public static Task<long> Min(this IAsyncEnumerable<long> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(new Func<long, long, long>(Math.Min), CancellationToken.None);
        }

        public static Task<long> Min(this IAsyncEnumerable<long> source, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(new Func<long, long, long>(Math.Min), cancellationToken);
        }

        public static Task<long> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, long> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(CancellationToken.None);
        }

        public static Task<long> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, long> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(cancellationToken);
        }

        public static Task<long> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<long>> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(CancellationToken.None);
        }

        public static Task<long> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<long>> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(cancellationToken);
        }

        public static Task<float> Min(this IAsyncEnumerable<float> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(new Func<float, float, float>(Math.Min), CancellationToken.None);
        }

        public static Task<float> Min(this IAsyncEnumerable<float> source, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(new Func<float, float, float>(Math.Min), cancellationToken);
        }

        public static Task<float> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, float> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(CancellationToken.None);
        }

        public static Task<float> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, float> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(cancellationToken);
        }

        public static Task<float> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<float>> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(CancellationToken.None);
        }

        public static Task<float> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<float>> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(cancellationToken);
        }

        public static Task<double> Min(this IAsyncEnumerable<double> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(new Func<double, double, double>(Math.Min), CancellationToken.None);
        }

        public static Task<double> Min(this IAsyncEnumerable<double> source, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(new Func<double, double, double>(Math.Min), cancellationToken);
        }

        public static Task<double> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, double> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(CancellationToken.None);
        }

        public static Task<double> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, double> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(cancellationToken);
        }

        public static Task<double> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<double>> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(CancellationToken.None);
        }

        public static Task<double> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<double>> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(cancellationToken);
        }

        public static Task<decimal> Min(this IAsyncEnumerable<decimal> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(new Func<decimal, decimal, decimal>(Math.Min), CancellationToken.None);
        }

        public static Task<decimal> Min(this IAsyncEnumerable<decimal> source, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(new Func<decimal, decimal, decimal>(Math.Min), cancellationToken);
        }

        public static Task<decimal> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, decimal> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(CancellationToken.None);
        }

        public static Task<decimal> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, decimal> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(cancellationToken);
        }

        public static Task<decimal> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<decimal>> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(CancellationToken.None);
        }

        public static Task<decimal> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<decimal>> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(cancellationToken);
        }

        public static Task<int?> Min(this IAsyncEnumerable<int?> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(default(int?), new Func<int?, int?, int?>(NullableMin), CancellationToken.None);
        }

        public static Task<int?> Min(this IAsyncEnumerable<int?> source, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(default(int?), new Func<int?, int?, int?>(NullableMin), cancellationToken);
        }

        public static Task<int?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, int?> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(CancellationToken.None);
        }

        public static Task<int?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, int?> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(cancellationToken);
        }

        public static Task<int?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<int?>> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(CancellationToken.None);
        }

        public static Task<int?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<int?>> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(cancellationToken);
        }

        public static Task<long?> Min(this IAsyncEnumerable<long?> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(default(long?), new Func<long?, long?, long?>(NullableMin), CancellationToken.None);
        }

        public static Task<long?> Min(this IAsyncEnumerable<long?> source, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(default(long?), new Func<long?, long?, long?>(NullableMin), cancellationToken);
        }

        public static Task<long?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, long?> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(CancellationToken.None);
        }

        public static Task<long?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, long?> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(cancellationToken);
        }

        public static Task<long?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<long?>> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(CancellationToken.None);
        }

        public static Task<long?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<long?>> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(cancellationToken);
        }

        public static Task<float?> Min(this IAsyncEnumerable<float?> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(default(float?), new Func<float?, float?, float?>(NullableMin), CancellationToken.None);
        }

        public static Task<float?> Min(this IAsyncEnumerable<float?> source, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(default(float?), new Func<float?, float?, float?>(NullableMin), cancellationToken);
        }

        public static Task<float?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, float?> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(CancellationToken.None);
        }

        public static Task<float?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, float?> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(cancellationToken);
        }

        public static Task<float?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<float?>> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(CancellationToken.None);
        }

        public static Task<float?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<float?>> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(cancellationToken);
        }

        public static Task<double?> Min(this IAsyncEnumerable<double?> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(default(double?), new Func<double?, double?, double?>(NullableMin), CancellationToken.None);
        }

        public static Task<double?> Min(this IAsyncEnumerable<double?> source, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(default(double?), new Func<double?, double?, double?>(NullableMin), cancellationToken);
        }

        public static Task<double?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, double?> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(CancellationToken.None);
        }

        public static Task<double?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, double?> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(cancellationToken);
        }

        public static Task<double?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<double?>> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(CancellationToken.None);
        }

        public static Task<double?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<double?>> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(cancellationToken);
        }

        public static Task<decimal?> Min(this IAsyncEnumerable<decimal?> source)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(default(decimal?), new Func<decimal?, decimal?, decimal?>(NullableMin), CancellationToken.None);
        }

        public static Task<decimal?> Min(this IAsyncEnumerable<decimal?> source, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));

            return source.Aggregate(default(decimal?), new Func<decimal?, decimal?, decimal?>(NullableMin), cancellationToken);
        }

        public static Task<decimal?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, decimal?> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(CancellationToken.None);
        }

        public static Task<decimal?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, decimal?> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(cancellationToken);
        }

        public static Task<decimal?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<decimal?>> selector)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(CancellationToken.None);
        }

        public static Task<decimal?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<decimal?>> selector, CancellationToken cancellationToken)
        {
            if (source == null)
                throw new ArgumentNullException(nameof(source));
            if (selector == null)
                throw new ArgumentNullException(nameof(selector));

            return source.Select(selector).Min(cancellationToken);
        }

        private static T? NullableMax<T>(T? x, T? y)
            where T : struct, IComparable<T>
        {
            if (!x.HasValue)
                return y;
            if (!y.HasValue)
                return x;
            if (x.Value.CompareTo(y.Value) >= 0)
                return x;
            return y;
        }

        private static T? NullableMin<T>(T? x, T? y)
            where T : struct, IComparable<T>
        {
            if (!x.HasValue)
                return y;
            if (!y.HasValue)
                return x;
            if (x.Value.CompareTo(y.Value) <= 0)
                return x;
            return y;
        }
    }
}