TreeSort.cs

using System;
using System.Collections.Generic;
using System.Linq;
using Advanced.Algorithms.DataStructures;

namespace Advanced.Algorithms.Sorting;

/// <summary>
///     A tree sort implementation.
/// </summary>
public class TreeSort<T> where T : IComparable
{
    private TreeSort()
    {
    }

    /// <summary>
    ///     Time complexity: O(nlog(n)).
    /// </summary>
    public static IEnumerable<T> Sort(IEnumerable<T> enumerable, SortDirection sortDirection = SortDirection.Ascending)
    {
        //create BST
        var tree = new RedBlackTree<T>();
        foreach (var item in enumerable) tree.Insert(item);

        return sortDirection == SortDirection.Ascending ? tree.AsEnumerable() : tree.AsEnumerableDesc();
    }
}