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

#nullable disable

using System.Collections.Generic;
using System.Linq;
using Microsoft.CodeAnalysis.CSharp.Extensions;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Roslyn.Utilities;

namespace Microsoft.CodeAnalysis.CSharp.Organizing.Organizers;

internal static partial class ModifiersOrganizer
{
    public static SyntaxTokenList Organize(SyntaxTokenList modifiers)
    {
        if (modifiers.Count > 1 && !modifiers.SpansPreprocessorDirective())
        {
            var initialList = new List<SyntaxToken>(modifiers);
            var leadingTrivia = initialList.First().LeadingTrivia;
            initialList[0] = initialList[0].WithLeadingTrivia();

            var finalList = initialList.OrderBy(new Comparer()).ToList();
            if (!initialList.SequenceEqual(finalList))
            {
                finalList[0] = finalList[0].WithLeadingTrivia(leadingTrivia);

                return [.. finalList];
            }
        }

        return modifiers;
    }
}