// 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 System.Runtime.CompilerServices;
 
namespace Microsoft.CodeAnalysis.CodeGeneration
{
    internal class CodeGenerationEventInfo
    {
        private static readonly ConditionalWeakTable<IEventSymbol, CodeGenerationEventInfo> s_eventToInfoMap =
            new();
 
        private readonly bool _isUnsafe;
        private CodeGenerationEventInfo(bool isUnsafe)
            => _isUnsafe = isUnsafe;
 
        public static void Attach(IEventSymbol @event, bool isUnsafe)
        {
            var info = new CodeGenerationEventInfo(isUnsafe);
            s_eventToInfoMap.Add(@event, info);
        }
 
        private static CodeGenerationEventInfo GetInfo(IEventSymbol @event)
        {
            s_eventToInfoMap.TryGetValue(@event, out var info);
            return info;
        }
 
        public static bool GetIsUnsafe(IEventSymbol @event)
            => GetIsUnsafe(GetInfo(@event));
 
        private static bool GetIsUnsafe(CodeGenerationEventInfo info)
            => info != null && info._isUnsafe;
    }
}