using Magellan.Framework;
using System;
using System.Linq;
using System.Reflection;

namespace Common.Infrastructure.Mvc
{
	public class ReflectionBasedControllerActionVerifier : IControllerActionVerifier
	{
		public bool Exists(Assembly controllerAssembly, string controllerName, string actionName)
		{
			var query = from controllerType in controllerAssembly.GetExportedTypes()
						where typeof(IController).IsAssignableFrom(controllerType)
						&& controllerType.Name.ToLower().StartsWith(controllerName.ToLower())
						select controllerType;

			if (query == null || query.Count() != 1) return false; //Controller not found

			var methods = from method in query.ElementAt(0).GetMethods(BindingFlags.Public | BindingFlags.Instance)
						  where typeof(ActionResult).IsAssignableFrom(method.ReturnType)
						  && method.Name.ToLower() == actionName.ToLower()
						  select method;

			if (methods == null || methods.Count() != 1) return false; //Action not found

			return true;
		}
	}
}