using System;
using System.Diagnostics.Contracts;
using System.Reflection;
using System.Web.Mvc;

namespace LeafWeb.Web.Attributes
{
	/// <summary>
	/// Add to actions to use multiple submit buttons (back or save, for example)
	/// </summary>
	/// <remarks>
	/// http://blog.ashmind.com/2010/03/15/multiple-submit-buttons-with-asp-net-mvc-final-solution/
	/// https://github.com/ashmind/lightwiki/blob/master/$libraries/AshMind.Web.Mvc/HttpParamActionAttribute.cs
	/// </remarks>
	public class HttpParamActionAttribute : ActionNameSelectorAttribute
	{
		[Pure]
		[ContractVerification(false)]
		public override bool IsValidName(ControllerContext controllerContext, string actionName, MethodInfo methodInfo)
		{
			if (actionName.Equals(methodInfo.Name, StringComparison.InvariantCultureIgnoreCase))
				return true;

			if (!actionName.Equals("Action", StringComparison.InvariantCultureIgnoreCase))
				return false;

			var request = controllerContext.RequestContext.HttpContext.Request;
			return request[methodInfo.Name] != null;
		}
	}
}