using System;
using System.Collections.Generic;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using SharpGen.Model;

namespace SharpGen.Generator.Marshallers
{
    internal abstract class FieldMarshallerBase : MarshallerBase, IMarshaller
    {
        public bool CanMarshal(CsMarshalBase csElement) => csElement is CsField field && CanMarshal(field);

        protected abstract bool CanMarshal(CsField csField);

        public bool GeneratesMarshalVariable(CsMarshalCallableBase csElement) => throw new NotSupportedException();

        public TypeSyntax GetMarshalTypeSyntax(CsMarshalBase csElement) => throw new NotSupportedException();

        public FixedStatementSyntax GeneratePin(CsParameter csElement) => throw new NotSupportedException();

        public IEnumerable<StatementSyntax> GenerateManagedToNativeProlog(CsMarshalCallableBase csElement) =>
            throw new NotSupportedException();

        public IEnumerable<StatementSyntax> GenerateNativeToManagedExtendedProlog(CsMarshalCallableBase csElement) =>
            throw new NotSupportedException();

        public StatementSyntax GenerateManagedToNative(CsMarshalBase csElement, bool singleStackFrame) =>
            GenerateManagedToNative((CsField) csElement, singleStackFrame);

        public StatementSyntax GenerateNativeToManaged(CsMarshalBase csElement, bool singleStackFrame) =>
            GenerateNativeToManaged((CsField) csElement, singleStackFrame);

        protected abstract StatementSyntax GenerateManagedToNative(CsField csField, bool singleStackFrame);
        protected abstract StatementSyntax GenerateNativeToManaged(CsField csField, bool singleStackFrame);

        public ArgumentSyntax GenerateNativeArgument(CsMarshalCallableBase csElement) =>
            throw new NotSupportedException();

        public ArgumentSyntax GenerateManagedArgument(CsParameter csElement) => throw new NotSupportedException();

        public ParameterSyntax GenerateManagedParameter(CsParameter csElement) => throw new NotSupportedException();

        public StatementSyntax GenerateNativeCleanup(CsMarshalBase csElement, bool singleStackFrame) =>
            AllowNativeCleanup ? null : throw new NotSupportedException();

        protected abstract bool AllowNativeCleanup { get; }

        protected FieldMarshallerBase(Ioc ioc) : base(ioc)
        {
        }
    }
}