// 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.Immutable;
using System.Linq;
 
namespace Microsoft.CodeAnalysis.Simplification;
 
/// <summary>
/// An annotation that holds onto information about a type or namespace symbol.
/// </summary>
internal class SymbolAnnotation
{
    public const string Kind = "SymbolId";
 
    public static SyntaxAnnotation Create(ISymbol symbol)
        => new(Kind, DocumentationCommentId.CreateReferenceId(symbol));
 
    public static ISymbol? GetSymbol(SyntaxAnnotation annotation, Compilation compilation)
        => GetSymbols(annotation, compilation).FirstOrDefault();
 
    public static ImmutableArray<ISymbol> GetSymbols(SyntaxAnnotation annotation, Compilation compilation)
        => annotation.Data is null
            ? ImmutableArray<ISymbol>.Empty
            : DocumentationCommentId.GetSymbolsForReferenceId(annotation.Data, compilation);
}