// 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.Globalization;
using System.Reflection.Metadata;

namespace Microsoft.CodeAnalysis.CSharp.Symbols.Metadata.PE;

internal static class PEUtilities
{
    internal static DiagnosticInfo? DeriveCompilerFeatureRequiredAttributeDiagnostic(Symbol symbol, PEModuleSymbol module, EntityHandle handle, CompilerFeatureRequiredFeatures allowedFeatures, MetadataDecoder decoder)
    {
        string? disallowedFeature = module.Module.GetFirstUnsupportedCompilerFeatureFromToken(handle, decoder, allowedFeatures);
        return disallowedFeature != null
            ?  // '{0}' requires compiler feature '{1}', which is not supported by this version of the C# compiler.
               new CSDiagnosticInfo(ErrorCode.ERR_UnsupportedCompilerFeature, symbol, disallowedFeature)
            : null;
    }

    internal static DiagnosticInfo? DeriveUnrecognizedMemorySafetyRulesAttributeDiagnostic(Symbol symbol)
    {
        return symbol.ContainingModule.MemorySafetyRulesVersion.IsValid()
            ? null
            : new CSDiagnosticInfo(
                ErrorCode.ERR_UnrecognizedAttributeVersion,
                symbol,
                WellKnownTypes.GetMetadataName(WellKnownType.System_Runtime_CompilerServices_MemorySafetyRulesAttribute),
                ((int)MemorySafetyRulesVersion.Version2).ToString(CultureInfo.InvariantCulture));
    }
}