using HotelContracts.BindingModels;
using HotelContracts.SearchModels;
using HotelContracts.StoragesContracts;
using HotelContracts.ViewModels;
using HotelDataBaseImplement.Models;
using Microsoft.EntityFrameworkCore;

namespace HotelDataBaseImplement.Implements
{
	public class ConferenceBookingStorage : IConferenceBookingStorage
	{
		public List<ConferenceBookingViewModel> GetFullList()
		{
			using var context = new HotelDataBase();

			return context.ConferenceBookings
				.Include(x => x.Dinners)
				.ThenInclude(x => x.Dinner)
				.ThenInclude(x => x.RoomDinners)
				.ThenInclude(x => x.Room)
				.Include(x => x.Conference)
				.Include(x => x.Administrator)
				.Select(x => x.GetViewModel)
				.ToList();
		}

		public List<ConferenceBookingViewModel> GetFilteredList(ConferenceBookingSearchModel model)
		{
			if (!model.AdministratorId.HasValue)
			{
				return new();
			}
			using var context = new HotelDataBase();
			if (model.AdministratorId.HasValue)
			{
				return context.ConferenceBookings
					.Include(x => x.Dinners)
					.ThenInclude(x => x.Dinner)
					.ThenInclude(x => x.RoomDinners)
					.ThenInclude(x => x.Room)
					.Include(x => x.Conference)
					.Include(x => x.Administrator)
					.Where(x => x.AdministratorId == model.AdministratorId)
					.ToList()
					.Select(x => x.GetViewModel)
					.ToList();
			}
			return context.ConferenceBookings
				.Include(x => x.Dinners)
				.ThenInclude(x => x.Dinner)
				.ThenInclude(x => x.RoomDinners)
				.ThenInclude(x => x.Room)
				.Include(x => x.Conference)
				.Include(x => x.Administrator)
				.Where(x => x.PlaceСonference.Contains(model.PlaceСonference))
				.ToList()
				.Select(x => x.GetViewModel)
				.ToList();
		}

		public ConferenceBookingViewModel? GetElement(ConferenceBookingSearchModel model)
		{
			if (string.IsNullOrEmpty(model.PlaceСonference) && !model.Id.HasValue)
			{
				return null;
			}

			using var context = new HotelDataBase();

			return context.ConferenceBookings
				.Include(x => x.Dinners)
				.ThenInclude(x => x.Dinner)
				.ThenInclude(x => x.RoomDinners)
				.ThenInclude(x => x.Room)
				.Include(x => x.Conference)
				.Include(x => x.Administrator)
				.FirstOrDefault(x => (!string.IsNullOrEmpty(model.PlaceСonference) && x.PlaceСonference == model.PlaceСonference) || (model.Id.HasValue && x.Id == model.Id))?
			   .GetViewModel;
		}

		public ConferenceBookingViewModel? Insert(ConferenceBookingBindingModel model)
		{
			using var context = new HotelDataBase();
			var newConferenceBooking = ConferenceBooking.Create(context, model);

			if (newConferenceBooking == null)
			{
				return null;
			}

			context.ConferenceBookings.Add(newConferenceBooking);
			context.SaveChanges();

			return context.ConferenceBookings
				.Include(x => x.Dinners)
				.ThenInclude(x => x.Dinner)
				.ThenInclude(x => x.RoomDinners)
				.ThenInclude(x => x.Room)
				.Include(x => x.Conference)
				.Include(x => x.Administrator)
				.FirstOrDefault(x => x.Id == newConferenceBooking.Id)
				?.GetViewModel;
		}

		public ConferenceBookingViewModel? Update(ConferenceBookingBindingModel model)
		{
			using var context = new HotelDataBase();
			using var transaction = context.Database.BeginTransaction();
			try
			{
				var elem = context.ConferenceBookings
					 .Include(x => x.Dinners)
					 .ThenInclude(x => x.Dinner)
					 .ThenInclude(x => x.ConferenceBookingDinner)
					 .ThenInclude(x => x.ConferenceBooking)
					 .ThenInclude(x => x.Conference)
					 .FirstOrDefault(rec => rec.Id == model.Id); if (elem == null)
				{
					return null;
				}
				elem.Update(model);
				context.SaveChanges();
				if (model.ConferenceBookingDinners != null)
					elem.UpdateDinners(context, model);
				transaction.Commit();
				return elem.GetViewModel;
			}
			catch
			{
				transaction.Rollback();
				throw;
			}
		}

		public ConferenceBookingViewModel? Delete(ConferenceBookingBindingModel model)
		{
			using var context = new HotelDataBase();

			var element = context.ConferenceBookings
				.Include(x => x.Dinners)
				.FirstOrDefault(rec => rec.Id == model.Id);

			if (element != null)
			{
				context.ConferenceBookings.Remove(element);
				context.SaveChanges();

				return element.GetViewModel;
			}

			return null;
		}
	}
}