// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System.Linq;
using Microsoft.AspNetCore.Razor.Language.Intermediate;

namespace Microsoft.AspNetCore.Razor.Language.Extensions
{
    internal class AttributeDirectivePass : IntermediateNodePassBase, IRazorDirectiveClassifierPass
    {
        protected override void ExecuteCore(RazorCodeDocument codeDocument, DocumentIntermediateNode documentNode)
        {
            var @namespace = documentNode.FindPrimaryNamespace();
            var @class = documentNode.FindPrimaryClass();
            if (@namespace == null || @class == null)
            {
                return;
            }

            var classIndex = @namespace.Children.IndexOf(@class);
            foreach (var attribute in documentNode.FindDirectiveReferences(AttributeDirective.Directive))
            {
                var token = ((DirectiveIntermediateNode)attribute.Node).Tokens.FirstOrDefault();
                if (token != null)
                {
                    var node = new CSharpCodeIntermediateNode
                    {
                        Source = token.Source
                    };

                    node.Children.Add(new IntermediateToken()
                    {
                        Content = token.Content,
                        Source = token.Source,
                        Kind = TokenKind.CSharp,
                    });

                    @namespace.Children.Insert(classIndex++, node);
                }
            }
        }
    }
}
