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﻿using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Linq.Expressions;
using System.Runtime.Serialization;
namespace Nimbus.Extensions
    internal static class TypeExtensions
        internal static bool IsClosedTypeOf(this Type type, Type openGenericType)
            if (!openGenericType.IsGenericType) throw new ArgumentException("It's a bit difficult to have a closed type of a non-open-generic type", "openGenericType");
            var interfaces = type.GetInterfaces();
            var baseTypes = new[] {type}.DepthFirst(t => t.BaseType == null ? new Type[0] : new[] {t.BaseType});
            var typeAndAllThatThatEntails = new[] {type}.Union(interfaces).Union(baseTypes).ToArray();
            var genericTypes = typeAndAllThatThatEntails.Where(i => i.IsGenericType);
            var closedGenericTypes = genericTypes.Where(i => !i.IsGenericTypeDefinition);
            var assignableGenericTypes = closedGenericTypes.Where(i => openGenericType.IsAssignableFrom(i.GetGenericTypeDefinition()));
            return assignableGenericTypes.Any();
        internal static bool IsClosedTypeOf(this Type type, params Type[] openGenericTypes)
            return openGenericTypes.Any(type.IsClosedTypeOf);
        internal static bool IsInstantiable(this Type type)
            if (type.IsInterface) return false;
            if (type.IsAbstract) return false;
            if (type.IsGenericType) return false;
            return true;
        internal static Type[] GetGenericInterfacesClosing(this Type type, Type genericInterface)
            var genericInterfaces = type.GetInterfaces()
                                        .Where(i => i.IsClosedTypeOf(genericInterface))
                                        .ToArray();
            return genericInterfaces;
        internal static bool IsSerializable(this Type messageType)
                using (var mem = new MemoryStream())
                    var serializer = new DataContractSerializer(messageType);
                    var instance = Activator.CreateInstance(messageType, true);
                    serializer.WriteObject(mem, instance);
                return true;
            catch (Exception)
                return false;
        internal static string ToTypeNameSummary(this IEnumerable<Type> types, int summarizeAfter = 3, Func<Type, string> selector = null)
            selector = selector ?? (t => t.FullName);
            var typeArray = types as Type[] ?? types.ToArray();
            if (typeArray.Count() <= summarizeAfter)
                return string.Join(", ", typeArray.Select(selector));
            return string.Join(", ", typeArray.Take(summarizeAfter).Select(selector)) + " and {0} more.".FormatWith(typeArray.Length - summarizeAfter);

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