using FoodOrdersContracts.BindingModels;
using FoodOrdersContracts.ViewModels;
using FoodOrdersDataModels.Models;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace FoodOrdersDatabaseImplement.Models
{
    public class Shop : IShopModel
    {
        public int Id { get; set; }

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

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

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

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

        private Dictionary<int, (IDishModel, int)>? _shopDishs = null;

        [NotMapped]
        public Dictionary<int, (IDishModel, int)> ShopDishs
        {
            get
            {
                if (_shopDishs == null)
                {
                    _shopDishs = Dishs
                            .ToDictionary(x => x.DishId, x => (x.Dish as IDishModel, x.Count));
                }
                return _shopDishs;
            }
        }

        [ForeignKey("ShopId")]
        public virtual List<ShopDish> Dishs { get; set; } = new();

        public static Shop Create(FoodOrdersDatabase context, ShopBindingModel model)
        {
            return new Shop()
            {
                Id = model.Id,
                ShopName = model.ShopName,
                Address = model.Address,
                DateOpening = model.DateOpening,
                MaxCountDishs = model.MaxCountDishs,
                Dishs = model.ShopDishs.Select(x => new ShopDish
                {
                    Dish = context.Dishs.First(y => y.Id == x.Key),
                    Count = x.Value.Item2
                }).ToList()
            };
        }

        public void Update(ShopBindingModel model)
        {
            ShopName = model.ShopName;
            Address = model.Address;
            DateOpening = model.DateOpening;
            MaxCountDishs = model.MaxCountDishs;
        }

        public ShopViewModel GetViewModel => new()
        {
            Id = Id,
            ShopName = ShopName,
            Address = Address,
            DateOpening = DateOpening,
            MaxCountDishs = MaxCountDishs,
            ShopDishs = ShopDishs
        };

        public void UpdateDishs(FoodOrdersDatabase context, ShopBindingModel model)
        {
            var shopDishs = context.ShopDishs.Where(rec => rec.ShopId == model.Id).ToList();
            if (shopDishs != null && shopDishs.Count > 0)
            {
                context.ShopDishs.RemoveRange(shopDishs.Where(rec => !model.ShopDishs.ContainsKey(rec.DishId)));
                context.SaveChanges();
                foreach (var updateDish in shopDishs)
                {
                    if (model.ShopDishs.ContainsKey(updateDish.DishId))
                    {
                        updateDish.Count = model.ShopDishs[updateDish.DishId].Item2;
                        model.ShopDishs.Remove(updateDish.DishId);
                    }
                }
                context.SaveChanges();
            }
            var shop = context.Shops.First(x => x.Id == Id);
            foreach (var ic in model.ShopDishs)
            {
                context.ShopDishs.Add(new ShopDish
                {
                    Shop = shop,
                    Dish = context.Dishs.First(x => x.Id == ic.Key),
                    Count = ic.Value.Item2
                });
                context.SaveChanges();
            }
            _shopDishs = null;
        }
    }
}