using AutomobilePlantContracts.BindingModels;
using AutomobilePlantContracts.ViewModels;
using AutomobilePlantDataModels.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AutomobilePlantDatabaseImplement.Models
{
    public class Shop : IShopModel
    {
        public int Id { get; set; }
        [Required]
        public string Name { get; set; } = string.Empty;

        [Required]
        public string Address { get; set; } = string.Empty;

        [Required]
        public DateTime OpeningDate { get; set; }

        [ForeignKey("ShopId")]
        public List<ShopCar> Cars { get; set; } = new();

        private Dictionary<int, (ICarModel, int)>? _shopCars = null;

        [NotMapped]
        public Dictionary<int, (ICarModel, int)> ShopCars
        {
            get
            {
                if (_shopCars == null)
                {
                    _shopCars = Cars.ToDictionary(recPC => recPC.CarId, recPC => (recPC.Car as ICarModel, recPC.Count));
                }
                return _shopCars;
            }
        }

        [Required]
        public int MaxCountCars { get; set; }

        public static Shop Create(AutomobilePlantDatabase context, ShopBindingModel model)
        {
            return new Shop()
            {
                Id = model.Id,
                Name = model.Name,
                Address = model.Address,
                OpeningDate = model.OpeningDate,
                Cars = model.ShopCars.Select(x => new ShopCar
                {
                    Car = context.Cars.First(y => y.Id == x.Key),
                    Count = x.Value.Item2
                }).ToList(),
                MaxCountCars = model.MaxCountCars
            };
        }

        public void Update(ShopBindingModel model)
        {
            Name = model.Name;
            Address = model.Address;
            OpeningDate = model.OpeningDate;
            MaxCountCars = model.MaxCountCars;
        }

        public ShopViewModel GetViewModel => new()
        {
            Id = Id,
            Name = Name,
            Address = Address,
            OpeningDate = OpeningDate,
            ShopCars = ShopCars,
            MaxCountCars = MaxCountCars
        };

        public void UpdateCars(AutomobilePlantDatabase context, ShopBindingModel model)
        {
            var ShopCars = context.ShopCars.Where(rec => rec.ShopId == model.Id).ToList();
            if (ShopCars != null && ShopCars.Count > 0)
            {
                // удалили те, которых нет в модели
                context.ShopCars.RemoveRange(ShopCars.Where(rec => !model.ShopCars.ContainsKey(rec.CarId)));
                context.SaveChanges();
                ShopCars = context.ShopCars.Where(rec => rec.ShopId == model.Id).ToList();
                // обновили количество у существующих записей
                foreach (var updateCar in ShopCars)
                {
                    updateCar.Count = model.ShopCars[updateCar.CarId].Item2;
                    model.ShopCars.Remove(updateCar.CarId);
                }
                context.SaveChanges();
            }
            var shop = context.Shops.First(x => x.Id == Id);
            foreach (var elem in model.ShopCars)
            {
                context.ShopCars.Add(new ShopCar
                {
                    Shop = shop,
                    Car = context.Cars.First(x => x.Id == elem.Key),
                    Count = elem.Value.Item2
                });
                context.SaveChanges();
            }
            _shopCars = null;
        }
    }
}