//
// Author:
//   Jb Evain (jbevain@gmail.com)
//
// Copyright (c) 2008 - 2015 Jb Evain
// Copyright (c) 2008 - 2011 Novell, Inc.
//
// Licensed under the MIT/X11 license.
//

using MonoFN.Collections.Generic;
using System.Threading;

namespace MonoFN.Cecil
{
    public interface IGenericParameterProvider : IMetadataTokenProvider
    {
        bool HasGenericParameters { get; }
        bool IsDefinition { get; }
        ModuleDefinition Module { get; }
        Collection<GenericParameter> GenericParameters { get; }
        GenericParameterType GenericParameterType { get; }
    }

    public enum GenericParameterType
    {
        Type,
        Method
    }

    internal interface IGenericContext
    {
        bool IsDefinition { get; }
        IGenericParameterProvider Type { get; }
        IGenericParameterProvider Method { get; }
    }

    internal static partial class Mixin
    {
        public static bool GetHasGenericParameters(this IGenericParameterProvider self, ModuleDefinition module)
        {
            return module.HasImage() && module.Read(self, (provider, reader) => reader.HasGenericParameters(provider));
        }

        public static Collection<GenericParameter> GetGenericParameters(this IGenericParameterProvider self, ref Collection<GenericParameter> collection, ModuleDefinition module)
        {
            if (module.HasImage())
                return module.Read(ref collection, self, (provider, reader) => reader.ReadGenericParameters(provider));

            Interlocked.CompareExchange(ref collection, new GenericParameterCollection(self), null);
            return collection;
        }
    }
}