using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

using System.Web.Routing;
using Domain.Repositories;
using FilmsRUsOnline.Models;

namespace FilmsRUsOnline.Controllers
{
    public class NavigationController : Controller
    {
        private IFilmsRepository filmsRepository;

        public NavigationController(IFilmsRepository filmsRepository)
        {
            this.filmsRepository = filmsRepository;
        }

        // First implementation of DisplayMenu(), to get the ball rolling.
        
/*        public string DisplayMenu()
        {
            return "Hi from Nav";
        }
*/         

        // Enhanced version of DisplayMenu(), to actually display a menu :-)
        public ViewResult DisplayMenu(string genre)
        {
            Func<string, NavigationLink> makeLink =
                genreName => new NavigationLink
                {
                    Text = genreName ?? "Home",
                    RouteValues = new RouteValueDictionary(new
                    {
                        controller = "Films",
                        action = "List",
                        genre = genreName,
                        pageNumber = 1
                    }),

                    IsSelected = (genreName == genre)
                };

            // Put a Home link at the top.
            List<NavigationLink> links = new List<NavigationLink>();
            links.Add(makeLink(null));

            // Add a link for each distinct genre.
            var genres = filmsRepository.Films.Select(x => x.Genre);
            foreach (string genreName in genres.Distinct().OrderBy(x => x))
                links.Add(makeLink(genreName));

            // Return the information to the default view.
            return View(links);
        } 
    }
}