// 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 Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp.Syntax;
 
namespace Microsoft.VisualStudio.LanguageServices.CSharp.CodeModel;
 
internal static class SyntaxNodeExtensions
{
    public static bool TryGetAttributeLists(this SyntaxNode node, out SyntaxList<AttributeListSyntax> attributeLists)
    {
        if (node is CompilationUnitSyntax compilationUnit)
        {
            attributeLists = compilationUnit.AttributeLists;
            return true;
        }
        else if (node is BaseTypeDeclarationSyntax baseType)
        {
            attributeLists = baseType.AttributeLists;
            return true;
        }
        else if (node is BaseMethodDeclarationSyntax baseMethod)
        {
            attributeLists = baseMethod.AttributeLists;
            return true;
        }
        else if (node is BasePropertyDeclarationSyntax baseProperty)
        {
            attributeLists = baseProperty.AttributeLists;
            return true;
        }
        else if (node is BaseFieldDeclarationSyntax baseField)
        {
            attributeLists = baseField.AttributeLists;
            return true;
        }
        else if (node is DelegateDeclarationSyntax delegateDeclaration)
        {
            attributeLists = delegateDeclaration.AttributeLists;
            return true;
        }
        else if (node is EnumMemberDeclarationSyntax enumMember)
        {
            attributeLists = enumMember.AttributeLists;
            return true;
        }
        else if (node is ParameterSyntax parameter)
        {
            attributeLists = parameter.AttributeLists;
            return true;
        }
 
        attributeLists = default;
        return false;
    }
 
    public static SyntaxToken GetFirstTokenAfterAttributes(this SyntaxNode node)
    {
        if (node.TryGetAttributeLists(out var attributeLists) && attributeLists.Count > 0)
        {
            return attributeLists.Last().GetLastToken().GetNextToken();
        }
 
        return node.GetFirstToken();
    }
}