using System;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;

namespace Placebo.Internal
{
	internal static class ReflectionExtensions
	{
		public static string GetFriendlyName(this Type type)
		{
			if (type == null) return "<null>";

			var typeName = type.Name;
			if (!type.IsGenericType)
				return typeName;

			var length = typeName.IndexOf('`');
			if (length < 0) length = typeName.Length;

			return new StringBuilder()
				.Append(typeName, 0, length)
				.Append('<')
				.Append(string.Join(",", type.GetGenericArguments().Select(GetFriendlyName)))
				.Append('>')
				.ToString();
		}

		public static string GetObjectFriendlyName(this object subject)
		{
			if (subject == null) return "<null>";
			return string.Format(
				"{0}@{1:x}",
				subject.GetType().GetFriendlyName(),
				RuntimeHelpers.GetHashCode(subject));
		}
	}
}