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

using Domain.Entities;
using Domain.Repositories;
using FilmsRUsOnline.Models;

namespace FilmsRUsOnline.Controllers
{
    public class FilmsController : Controller
    {
        // The controller needs a films repository to access films.
        private IFilmsRepository filmsRepository;

        // Number of films to display on each page.
        public int PageSize = 3;


        // Constructor - approach #1, creates a repository manually.
        public FilmsController()
        {
            filmsRepository = new DummyFilmsRepository();
        }


        // Constructor - approach #2, gets given a repository by Dependency Injection (DI).
        public FilmsController(IFilmsRepository filmsRepository)
        {
            this.filmsRepository = filmsRepository;
        }


        // Action method to list a page of films (page-by-page).
        // Note the default value for the pageNumber - this is a C# 4 language feature.
        // If you're using C# 3.x, do this instead:  [DefaultValue(1)]int pageNumber
        public ViewResult List(string genre, int pageNumber = 1)
        {
            // If the URL specifies a genre, only show films in that genre.
            var filmsToShow = (genre == null)
                ? filmsRepository.Films
                : filmsRepository.Films.Where(x => x.Genre == genre);

            FilmsViewModel vm = new FilmsViewModel()
            {
                // Pass "list of films" info to view.
                Films = filmsToShow.Skip((pageNumber - 1) * PageSize)
                                        .Take(PageSize)
                                        .ToList(),

                // Pass "page information" info to view.
                PaginationInfo = new PaginationInfo
                {
                    CurrPage = pageNumber,
                    ItemsPerPage = PageSize,
                    NumItems = filmsToShow.Count()
                },

                // Pass "current genre" info to view.
                CurrentGenre = genre
            };

            return View(vm);
        }
    }
}