using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using SharpGen.Model;
using static Microsoft.CodeAnalysis.CSharp.SyntaxFactory;

namespace SharpGen.Generator.Marshallers
{
    internal sealed class EnumParameterWrapperMarshaller : WrapperMarshallerBase
    {
        public EnumParameterWrapperMarshaller(Ioc ioc, IMarshaller implementation) : base(ioc, implementation)
        {
        }

        public static bool IsApplicable(CsMarshalBase csElement) => csElement is CsParameter {PublicType: CsEnum};

        public override ArgumentSyntax GenerateNativeArgument(CsMarshalCallableBase csElement)
        {
            var argument = base.GenerateNativeArgument(csElement);
            return csElement.PassedByNativeReference
                       ? argument
                       : Argument(
                           CheckedExpression(
                               SyntaxKind.UncheckedExpression,
                               GeneratorHelpers.CastExpression(
                                   ParseTypeName(((CsEnum) csElement.PublicType).UnderlyingType.Name),
                                   argument.Expression
                               )
                           )
                       );
        }
    }
}