using HotelContracts.BindingModels;
using HotelContracts.SearchModels;
using HotelContracts.StoragesContracts;
using HotelContracts.ViewModels;
using HotelDatabaseImplement.Models;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace HotelDatabaseImplement.Implements
{
    public class BookingStorage : IBookingStorage
    {
        public BookingViewModel? Delete(BookingBindingModel model)
        {
            using var context = new HotelDatabase();
            var element = context.Bookings.FirstOrDefault(x => x.Id == model.Id);
            if (element != null)
            {
                context.Bookings.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }

        public BookingViewModel? GetElement(BookingSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }
            using var context = new HotelDatabase();
            return context.Bookings.FirstOrDefault(x => x.Id == model.Id)?.GetViewModel;
        }

        public List<BookingViewModel> GetFilteredList(BookingSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return new();
            }
            using var context = new HotelDatabase();
            return context.Bookings.Where(x => x.Id == model.Id).Select(x => x.GetViewModel).ToList();
        }

        public List<BookingViewModel> GetFullList()
        {
            using var context = new HotelDatabase();
            return context.Bookings.Select(x => x.GetViewModel).ToList();
        }

        public BookingViewModel? Insert(BookingBindingModel model)
        {
            var newBooking = Booking.Create(model);
            if (newBooking == null)
            {
                return null;
            }
            using var context = new HotelDatabase();
            context.Bookings.Add(newBooking);
            context.SaveChanges();
            return newBooking.GetViewModel;
        }

        public BookingViewModel? Update(BookingBindingModel model)
        {
            using var context = new HotelDatabase();
            using var transaction = context.Database.BeginTransaction();
            try
            {
                var booking = context.Bookings.FirstOrDefault(x => x.Id == model.Id);
                if (booking == null)
                {
                    return null;
                }
                booking.Update(model);
                context.SaveChanges();
                transaction.Commit();
                return booking.GetViewModel;
            }
            catch
            {
                transaction.Rollback();
                throw;
            }
        }
    }
}