using System;
using System.Collections.Generic;
using System.Linq;

namespace System.Reflection
{
    public static class AssemblyExtensions
    {
        public static IEnumerable<Type> GetInterfaces<TInterfaceType>(this Assembly assembly)
        {
            if (assembly is null)
            {
                throw new ArgumentNullException(nameof(assembly));
            }

            return assembly.GetTypes(typeof(TInterfaceType));
        }

        public static IEnumerable<Type> GetTypes(this Assembly assembly, Type interfaceType)
        {
            if (assembly is null)
            {
                throw new ArgumentNullException(nameof(assembly));
            }

            if (interfaceType is null)
            {
                throw new ArgumentNullException(nameof(interfaceType));
            }

            return assembly.GetTypes()
                .Where(t => t.GetInterfaces().Contains(interfaceType));
        }
    }
}