// 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.

namespace Microsoft.CodeAnalysis;

internal partial struct SymbolKey
{
    private sealed class DynamicTypeSymbolKey : AbstractSymbolKey<IDynamicTypeSymbol>
    {
        public static readonly DynamicTypeSymbolKey Instance = new();

        public sealed override void Create(IDynamicTypeSymbol symbol, SymbolKeyWriter writer)
        {
            // No need to encode anything here.  There is only ever one dynamic-symbol
            // per compilation.
        }

        protected sealed override SymbolKeyResolution Resolve(
            SymbolKeyReader reader, IDynamicTypeSymbol? contextualSymbol, out string? failureReason)
        {
            if (reader.Compilation.Language == LanguageNames.VisualBasic)
            {
                // TODO: We could consider mapping 'dynamic' to 'object' when resolving these types in Visual Basic.
                // However, this should be driven by an actual scenario that is not working that can be traced down
                // to this check.
                failureReason = $"({nameof(DynamicTypeSymbolKey)} is not supported in {LanguageNames.VisualBasic})";
                return default;
            }

            failureReason = null;
            return new SymbolKeyResolution(reader.Compilation.DynamicType);
        }
    }
}