marechai/Marechai/Areas/Admin/Controllers/ResolutionsByScreenController.cs

using System.Linq;
using System.Threading.Tasks;
using Marechai.Database.Models;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Query;

namespace Marechai.Areas.Admin.Controllers
{
    [Area("Admin"), Authorize]
    public class ResolutionsByScreenController : Controller
    {
        readonly MarechaiContext _context;

        public ResolutionsByScreenController(MarechaiContext context) => _context = context;

        // GET: ResolutionsByScreen
        public async Task<IActionResult> Index()
        {
            IIncludableQueryable<ResolutionsByScreen, Screen> marechaiContext =
                _context.ResolutionsByScreen.Include(r => r.Resolution).Include(r => r.Screen);

            return View(await marechaiContext.OrderBy(r => r.Screen.ToString()).ThenBy(r => r.Resolution.ToString()).
                                              ToListAsync());
        }

        // GET: ResolutionsByScreen/Details/5
        public async Task<IActionResult> Details(long? id)
        {
            if(id == null)
                return NotFound();

            ResolutionsByScreen resolutionsByScreen =
                await _context.ResolutionsByScreen.Include(r => r.Resolution).Include(r => r.Screen).
                               FirstOrDefaultAsync(m => m.Id == id);

            if(resolutionsByScreen == null)
                return NotFound();

            return View(resolutionsByScreen);
        }

        // GET: ResolutionsByScreen/Create
        public IActionResult Create()
        {
            ViewData["ResolutionId"] = new SelectList(_context.Resolutions.Select(r => new
            {
                r.Id, Name = r.ToString()
            }).OrderBy(r => r.Name), "Id", "Name");

            ViewData["ScreenId"] = new SelectList(_context.Screens.Select(s => new
            {
                s.Id,
                Name = s.NativeResolution != null ? $"{s.Diagonal}\" {s.Type} with {s.NativeResolution}"
                           : $"{s.Diagonal}\" {s.Type}"
            }).OrderBy(s => s.Name), "Id", "Name");

            return View();
        }

        // POST: ResolutionsByScreen/Create
        // To protect from overposting attacks, please enable the specific properties you want to bind to, for 
        // more details see http://go.microsoft.com/fwlink/?LinkId=317598.
        [HttpPost, ValidateAntiForgeryToken]
        public async Task<IActionResult> Create(
            [Bind("ScreenId,ResolutionId,Id")] ResolutionsByScreen resolutionsByScreen)
        {
            if(ModelState.IsValid)
            {
                _context.Add(resolutionsByScreen);
                await _context.SaveChangesAsync();

                return RedirectToAction(nameof(Index));
            }

            ViewData["ResolutionId"] = new SelectList(_context.Resolutions.Select(r => new
            {
                r.Id, Name = r.ToString()
            }).OrderBy(r => r.Name), "Id", "Name", resolutionsByScreen.ResolutionId);

            ViewData["ScreenId"] = new SelectList(_context.Screens.Select(s => new
            {
                s.Id,
                Name = s.NativeResolution != null ? $"{s.Diagonal}\" {s.Type} with {s.NativeResolution}"
                           : $"{s.Diagonal}\" {s.Type}"
            }).OrderBy(s => s.Name), "Id", "Name", resolutionsByScreen.ScreenId);

            return View(resolutionsByScreen);
        }

        // GET: ResolutionsByScreen/Edit/5
        public async Task<IActionResult> Edit(long? id)
        {
            if(id == null)
                return NotFound();

            ResolutionsByScreen resolutionsByScreen = await _context.ResolutionsByScreen.FindAsync(id);

            if(resolutionsByScreen == null)
                return NotFound();

            ViewData["ResolutionId"] = new SelectList(_context.Resolutions.Select(r => new
            {
                r.Id, Name = r.ToString()
            }).OrderBy(r => r.Name), "Id", "Name", resolutionsByScreen.ResolutionId);

            ViewData["ScreenId"] = new SelectList(_context.Screens.Select(s => new
            {
                s.Id,
                Name = s.NativeResolution != null ? $"{s.Diagonal}\" {s.Type} with {s.NativeResolution}"
                           : $"{s.Diagonal}\" {s.Type}"
            }).OrderBy(s => s.Name), "Id", "Name", resolutionsByScreen.ScreenId);

            return View(resolutionsByScreen);
        }

        // POST: ResolutionsByScreen/Edit/5
        // To protect from overposting attacks, please enable the specific properties you want to bind to, for 
        // more details see http://go.microsoft.com/fwlink/?LinkId=317598.
        [HttpPost, ValidateAntiForgeryToken]
        public async Task<IActionResult> Edit(
            long id, [Bind("ScreenId,ResolutionId,Id")] ResolutionsByScreen resolutionsByScreen)
        {
            if(id != resolutionsByScreen.Id)
                return NotFound();

            if(ModelState.IsValid)
            {
                try
                {
                    _context.Update(resolutionsByScreen);
                    await _context.SaveChangesAsync();
                }
                catch(DbUpdateConcurrencyException)
                {
                    if(!ResolutionsByScreenExists(resolutionsByScreen.Id))
                        return NotFound();

                    throw;
                }

                return RedirectToAction(nameof(Index));
            }

            ViewData["ResolutionId"] = new SelectList(_context.Resolutions.Select(r => new
            {
                r.Id, Name = r.ToString()
            }).OrderBy(r => r.Name), "Id", "Name", resolutionsByScreen.ResolutionId);

            ViewData["ScreenId"] = new SelectList(_context.Screens.Select(s => new
            {
                s.Id,
                Name = s.NativeResolution != null ? $"{s.Diagonal}\" {s.Type} with {s.NativeResolution}"
                           : $"{s.Diagonal}\" {s.Type}"
            }).OrderBy(s => s.Name), "Id", "Name", resolutionsByScreen.ScreenId);

            return View(resolutionsByScreen);
        }

        // GET: ResolutionsByScreen/Delete/5
        public async Task<IActionResult> Delete(long? id)
        {
            if(id == null)
                return NotFound();

            ResolutionsByScreen resolutionsByScreen =
                await _context.ResolutionsByScreen.Include(r => r.Resolution).Include(r => r.Screen).
                               FirstOrDefaultAsync(m => m.Id == id);

            if(resolutionsByScreen == null)
                return NotFound();

            return View(resolutionsByScreen);
        }

        // POST: ResolutionsByScreen/Delete/5
        [HttpPost, ActionName("Delete"), ValidateAntiForgeryToken]
        public async Task<IActionResult> DeleteConfirmed(long id)
        {
            ResolutionsByScreen resolutionsByScreen = await _context.ResolutionsByScreen.FindAsync(id);
            _context.ResolutionsByScreen.Remove(resolutionsByScreen);
            await _context.SaveChangesAsync();

            return RedirectToAction(nameof(Index));
        }

        bool ResolutionsByScreenExists(long id) => _context.ResolutionsByScreen.Any(e => e.Id == id);

        [AcceptVerbs("Get", "Post")]
        public async Task<IActionResult> VerifyUnique(int screenId, int resolutionId) =>
            await _context.ResolutionsByScreen.FirstOrDefaultAsync(i => i.ScreenId     == screenId &&
                                                                        i.ResolutionId == resolutionId) is null
                ? Json(true) : Json("The selected screen already has the selected resolution.");
    }
}