// 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.Collections.Immutable;
using System.Threading;
using Microsoft.CodeAnalysis.Utilities;
 
namespace Microsoft.CodeAnalysis.GenerateMember.GenerateParameterizedMember
{
    internal partial class AbstractGenerateParameterizedMemberService<TService, TSimpleNameSyntax, TExpressionSyntax, TInvocationExpressionSyntax>
    {
        protected class MethodSignatureInfo : SignatureInfo
        {
            private readonly IMethodSymbol _methodSymbol;
            private readonly ImmutableArray<string> _parameterNames;
 
            public MethodSignatureInfo(
                SemanticDocument document,
                State state,
                IMethodSymbol methodSymbol,
                ImmutableArray<string> parameterNames = default)
                : base(document, state)
            {
                _methodSymbol = methodSymbol;
                _parameterNames = parameterNames;
            }
 
            protected override ITypeSymbol DetermineReturnTypeWorker(CancellationToken cancellationToken)
                => _methodSymbol.ReturnType;
 
            protected override RefKind DetermineRefKind(CancellationToken cancellationToken)
                => _methodSymbol.RefKind;
 
            protected override ImmutableArray<ITypeParameterSymbol> DetermineTypeParametersWorker(CancellationToken cancellationToken)
                => _methodSymbol.TypeParameters;
 
            protected override ImmutableArray<RefKind> DetermineParameterModifiers(CancellationToken cancellationToken)
                => _methodSymbol.Parameters.SelectAsArray(p => p.RefKind);
 
            protected override ImmutableArray<bool> DetermineParameterOptionality(CancellationToken cancellationToken)
                => _methodSymbol.Parameters.SelectAsArray(p => p.IsOptional);
 
            protected override ImmutableArray<ITypeSymbol> DetermineParameterTypes(CancellationToken cancellationToken)
                => _methodSymbol.Parameters.SelectAsArray(p => p.Type);
 
            protected override ImmutableArray<ParameterName> DetermineParameterNames(CancellationToken cancellationToken)
                => _parameterNames.IsDefault
                    ? _methodSymbol.Parameters.SelectAsArray(p => new ParameterName(p.Name, isFixed: true))
                    : _parameterNames.SelectAsArray(p => new ParameterName(p, isFixed: true));
 
            protected override ImmutableArray<ITypeSymbol> DetermineTypeArguments(CancellationToken cancellationToken)
                => ImmutableArray<ITypeSymbol>.Empty;
        }
    }
}