// 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 EventSymbolKey : AbstractSymbolKey<IEventSymbol>
    {
        public static readonly EventSymbolKey Instance = new();
 
        public sealed override void Create(IEventSymbol symbol, SymbolKeyWriter visitor)
        {
            visitor.WriteString(symbol.MetadataName);
            visitor.WriteSymbolKey(symbol.ContainingType);
#if !ROSLYN_4_12_OR_LOWER
            visitor.WriteBoolean(symbol.PartialDefinitionPart is not null);
#endif
        }
 
        protected sealed override SymbolKeyResolution Resolve(
            SymbolKeyReader reader, IEventSymbol? contextualSymbol, out string? failureReason)
        {
            var metadataName = reader.ReadString();
            var containingTypeResolution = reader.ReadSymbolKey(contextualSymbol?.ContainingType, out var containingTypeFailureReason);
#if !ROSLYN_4_12_OR_LOWER
            var isPartialImplementationPart = reader.ReadBoolean();
#endif
 
            if (containingTypeFailureReason != null)
            {
                failureReason = $"({nameof(EventSymbolKey)} {nameof(containingTypeResolution)} failed -> {containingTypeFailureReason})";
                return default;
            }
 
            using var events = GetMembersOfNamedType<IEventSymbol>(containingTypeResolution, metadataName);
 
#if !ROSLYN_4_12_OR_LOWER
            if (isPartialImplementationPart)
            {
                for (var i = 0; i < events.Builder.Count; i++)
                {
                    var candidate = events.Builder[i];
                    events.Builder[i] = candidate.PartialImplementationPart ?? candidate;
                }
            }
#endif
 
            return CreateResolution(events, $"({nameof(EventSymbolKey)} '{metadataName}' not found)", out failureReason);
        }
    }
}