// 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.
 
using System.Collections.Generic;
using System.Linq;
using Microsoft.CodeAnalysis.CSharp.Syntax;
 
namespace Microsoft.CodeAnalysis.CSharp.Extensions;
 
internal static class BaseNamespaceDeclarationSyntaxExtensions
{
    public static TNamespaceDeclarationSyntax AddUsingDirectives<TNamespaceDeclarationSyntax>(
        this TNamespaceDeclarationSyntax namespaceDeclaration,
        IList<UsingDirectiveSyntax> usingDirectives,
        bool placeSystemNamespaceFirst,
        params SyntaxAnnotation[] annotations) where TNamespaceDeclarationSyntax : BaseNamespaceDeclarationSyntax
    {
        if (usingDirectives.Count == 0)
            return namespaceDeclaration;
 
        var newUsings = new List<UsingDirectiveSyntax>();
        newUsings.AddRange(namespaceDeclaration.Usings);
        newUsings.AddRange(usingDirectives);
 
        newUsings.SortUsingDirectives(namespaceDeclaration.Usings, placeSystemNamespaceFirst);
        newUsings = newUsings.Select(u => u.WithAdditionalAnnotations(annotations)).ToList();
 
        var newNamespace = namespaceDeclaration.WithUsings([.. newUsings]);
        return (TNamespaceDeclarationSyntax)newNamespace;
    }
}