// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.

using System.Web.Mvc.Properties;
using System.Web.Routing;

namespace System.Web.Mvc
{
    // represents a result that performs a redirection given some values dictionary
    public class RedirectToRouteResult : ActionResult
    {
        private RouteCollection _routes;

        public RedirectToRouteResult(RouteValueDictionary routeValues)
            :
                this(null, routeValues)
        {
        }

        public RedirectToRouteResult(string routeName, RouteValueDictionary routeValues)
            : this(routeName, routeValues, permanent: false)
        {
        }

        public RedirectToRouteResult(string routeName, RouteValueDictionary routeValues, bool permanent)
        {
            Permanent = permanent;
            RouteName = routeName ?? String.Empty;
            RouteValues = routeValues ?? new RouteValueDictionary();
        }

        public bool Permanent { get; private set; }

        public string RouteName { get; private set; }

        public RouteValueDictionary RouteValues { get; private set; }

        internal RouteCollection Routes
        {
            get
            {
                if (_routes == null)
                {
                    _routes = RouteTable.Routes;
                }
                return _routes;
            }
            set { _routes = value; }
        }

        public override void ExecuteResult(ControllerContext context)
        {
            if (context == null)
            {
                throw new ArgumentNullException("context");
            }
            if (context.IsChildAction)
            {
                throw new InvalidOperationException(MvcResources.RedirectAction_CannotRedirectInChildAction);
            }

            string destinationUrl = UrlHelper.GenerateUrl(RouteName, null /* actionName */, null /* controllerName */, RouteValues, Routes, context.RequestContext, false /* includeImplicitMvcValues */);
            if (String.IsNullOrEmpty(destinationUrl))
            {
                throw new InvalidOperationException(MvcResources.Common_NoRouteMatched);
            }

            context.Controller.TempData.Keep();

            if (Permanent)
            {
                context.HttpContext.Response.RedirectPermanent(destinationUrl, endResponse: false);
            }
            else
            {
                context.HttpContext.Response.Redirect(destinationUrl, endResponse: false);
            }
        }
    }
}
