// 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.ToSyntaxList());
            return (TNamespaceDeclarationSyntax)newNamespace;
        }
    }
}