using System;
using System.Linq;
using System.Reflection;

namespace jive
{
  public static class TypeExtensions
  {
    public static Type last_interface(this Type type)
    {
      return type.GetInterfaces()[type.GetInterfaces().Length - 1];
    }

    public static Type first_interface(this Type type)
    {
      return type.GetInterfaces()[0];
    }

    public static bool is_a_generic_type(this Type type)
    {
      //return type.IsGenericType;
      return type.IsGenericTypeDefinition;
    }

    public static object default_value(this Type type)
    {
      return (type.IsValueType ? Activator.CreateInstance(type) : null);
    }

    public static Attribute get_attribute<Attribute>(this ICustomAttributeProvider provider)
      where Attribute : System.Attribute
      {
        return
          provider
          .GetCustomAttributes(typeof (Attribute), false)
          .Select(x => x.downcast_to<Attribute>())
          .First();
      }
  }
}