using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using DiscImageChef.CommonTypes.Metadata;
using DiscImageChef.Server.Models;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Newtonsoft.Json;

namespace DiscImageChef.Server.Areas.Admin.Controllers
{
    [Area("Admin"), Authorize]
    public class ChsController : Controller
    {
        readonly DicServerContext _context;

        public ChsController(DicServerContext context) => _context = context;

        // GET: Admin/Chs
        public async Task<IActionResult> Index() =>
            View(await _context.Chs.OrderBy(c => c.Cylinders).ThenBy(c => c.Heads).ThenBy(c => c.Sectors).
                                ToListAsync());

        // GET: Admin/Chs/Delete/5
        public async Task<IActionResult> Delete(int? id)
        {
            if(id == null)
            {
                return NotFound();
            }

            Chs chs = await _context.Chs.FirstOrDefaultAsync(m => m.Id == id);

            if(chs == null)
            {
                return NotFound();
            }

            return View(chs);
        }

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

            return RedirectToAction(nameof(Index));
        }

        public IActionResult Consolidate()
        {
            List<ChsModel> dups = _context.Chs.GroupBy(x => new
            {
                x.Cylinders, x.Heads, x.Sectors
            }).Where(x => x.Count() > 1).Select(x => new ChsModel
            {
                Cylinders = x.Key.Cylinders, Heads = x.Key.Heads, Sectors = x.Key.Sectors
            }).ToList();

            return View(new ChsModelForView
            {
                List = dups, Json = JsonConvert.SerializeObject(dups)
            });
        }

        [HttpPost, ActionName("Consolidate"), ValidateAntiForgeryToken]
        public IActionResult ConsolidateConfirmed(string models)
        {
            ChsModel[] duplicates;

            try
            {
                duplicates = JsonConvert.DeserializeObject<ChsModel[]>(models);
            }
            catch(JsonSerializationException)
            {
                return BadRequest();
            }

            if(duplicates is null)
                return BadRequest();

            foreach(ChsModel duplicate in duplicates)
            {
                Chs master = _context.Chs.FirstOrDefault(m => m.Cylinders == duplicate.Cylinders &&
                                                              m.Heads     == duplicate.Heads     &&
                                                              m.Sectors   == duplicate.Sectors);

                if(master is null)
                    continue;

                foreach(Chs chs in _context.Chs.Where(m => m.Cylinders == duplicate.Cylinders &&
                                                           m.Heads     == duplicate.Heads     &&
                                                           m.Sectors   == duplicate.Sectors).Skip(1).ToArray())
                {
                    foreach(TestedMedia media in _context.TestedMedia.Where(d => d.CHS.Id == chs.Id))
                    {
                        media.CHS = master;
                    }

                    foreach(TestedMedia media in _context.TestedMedia.Where(d => d.CurrentCHS.Id == chs.Id))
                    {
                        media.CurrentCHS = master;
                    }

                    _context.Chs.Remove(chs);
                }
            }

            _context.SaveChanges();

            return RedirectToAction(nameof(Index));
        }
    }
}