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

using System.Linq;
using System.Threading.Tasks;
using Marechai.Areas.Admin.Models;
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 ScreensByMachineController : Controller
    {
        readonly MarechaiContext _context;

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

        // GET: ScreensByMachine
        public async Task<IActionResult> Index()
        {
            IIncludableQueryable<ScreensByMachine, Screen> marechaiContext =
                _context.ScreensByMachine.Include(s => s.Machine).Include(s => s.Screen);

            return View(await marechaiContext.Select(s => new ScreensByMachineViewModel
            {
                Id = s.Id,
                Screen = s.Screen.NativeResolution != null
                             ? $"{s.Screen.Diagonal}\" {s.Screen.Type} with {s.Screen.NativeResolution}"
                             : $"{s.Screen.Diagonal}\" {s.Screen}",
                Machine = $"{s.Machine.Company.Name} {s.Machine.Name}"
            }).OrderBy(s => s.Machine).ThenBy(s => s.Screen).ToListAsync());
        }

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

            ScreensByMachineViewModel screensByMachine =
                await _context.ScreensByMachine.Include(s => s.Machine).Include(s => s.Screen).
                               Select(s => new ScreensByMachineViewModel
                               {
                                   Id = s.Id,
                                   Screen = s.Screen.NativeResolution != null
                                                ? $"{s.Screen.Diagonal}\" {s.Screen.Type} with {s.Screen.NativeResolution}"
                                                : $"{s.Screen.Diagonal}\" {s.Screen}",
                                   Machine = $"{s.Machine.Company.Name} {s.Machine.Name}"
                               }).FirstOrDefaultAsync(m => m.Id == id);

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

            return View(screensByMachine);
        }

        // GET: ScreensByMachine/Create
        public IActionResult Create()
        {
            ViewData["MachineId"] = new SelectList(_context.Machines.OrderBy(m => m.Company.Name).ThenBy(m => m.Name).
                                                            Select(m => new
                                                            {
                                                                m.Id, Name = $"{m.Company.Name} {m.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: ScreensByMachine/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,MachineId,Id")] ScreensByMachine screensByMachine)
        {
            if(ModelState.IsValid)
            {
                _context.Add(screensByMachine);
                await _context.SaveChangesAsync();

                return RedirectToAction(nameof(Index));
            }

            ViewData["MachineId"] = new SelectList(_context.Machines.OrderBy(m => m.Company.Name).ThenBy(m => m.Name).
                                                            Select(m => new
                                                            {
                                                                m.Id, Name = $"{m.Company.Name} {m.Name}"
                                                            }), "Id", "Name", screensByMachine.MachineId);

            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", screensByMachine.ScreenId);

            return View(screensByMachine);
        }

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

            ScreensByMachine screensByMachine = await _context.ScreensByMachine.FindAsync(id);

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

            ViewData["MachineId"] = new SelectList(_context.Machines.OrderBy(m => m.Company.Name).ThenBy(m => m.Name).
                                                            Select(m => new
                                                            {
                                                                m.Id, Name = $"{m.Company.Name} {m.Name}"
                                                            }), "Id", "Name", screensByMachine.MachineId);

            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", screensByMachine.ScreenId);

            return View(screensByMachine);
        }

        // POST: ScreensByMachine/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,MachineId,Id")] ScreensByMachine screensByMachine)
        {
            if(id != screensByMachine.Id)
                return NotFound();

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

                    throw;
                }

                return RedirectToAction(nameof(Index));
            }

            ViewData["MachineId"] = new SelectList(_context.Machines.OrderBy(m => m.Company.Name).ThenBy(m => m.Name).
                                                            Select(m => new
                                                            {
                                                                m.Id, Name = $"{m.Company.Name} {m.Name}"
                                                            }), "Id", "Name", screensByMachine.MachineId);

            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", screensByMachine.ScreenId);

            return View(screensByMachine);
        }

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

            ScreensByMachineViewModel screensByMachine =
                await _context.ScreensByMachine.Include(s => s.Machine).Include(s => s.Screen).
                               Select(s => new ScreensByMachineViewModel
                               {
                                   Id = s.Id,
                                   Screen = s.Screen.NativeResolution != null
                                                ? $"{s.Screen.Diagonal}\" {s.Screen.Type} with {s.Screen.NativeResolution}"
                                                : $"{s.Screen.Diagonal}\" {s.Screen}",
                                   Machine = $"{s.Machine.Company.Name} {s.Machine.Name}"
                               }).FirstOrDefaultAsync(m => m.Id == id);

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

            return View(screensByMachine);
        }

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

            return RedirectToAction(nameof(Index));
        }

        bool ScreensByMachineExists(long id) => _context.ScreensByMachine.Any(e => e.Id == id);

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