using SushiBarContracts.BindingModels;
using SushiBarContracts.ViewModels;
using SushiBarDataModels.Models;
using System.ComponentModel.DataAnnotations.Schema;
using System.ComponentModel.DataAnnotations;
using System.Xml.Linq;

namespace SushiBarDatabaseImplement.Models
{
    public class Shop : IShopModel
    {
        public int Id { get; private set; }
        [Required]
        public string ShopName { get; private set; } = string.Empty;
        [Required]
        public string Address { get; private set; } = string.Empty;
        [Required]
        public DateTime DateOpening { get; private set; }
        [Required]
        public int MaxCountSushi { get; private set; }

        private Dictionary<int, (ISushiModel, int)>? _shopSushi = null;

        [NotMapped]
        public Dictionary<int, (ISushiModel, int)> ListSushi
        {
            get
            {
                if (_shopSushi == null)
                {
                    _shopSushi = ListSushiFk
                            .ToDictionary(recPC => recPC.SushiId, recPC => (recPC.Sushi as ISushiModel, recPC.Count));
                }
                return _shopSushi;
            }
        }

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

        public static Shop Create(SushiBarDatabase context, ShopBindingModel model)
        {
            return new Shop()
            {
                Id = model.Id,
                ShopName = model.ShopName,
                Address = model.Address,
                DateOpening = model.DateOpening,
                MaxCountSushi = model.MaxCountSushi,
                ListSushiFk = model.ListSushi.Select(x => new ShopSushi
                {
                    Sushi = context.ListSushi.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;
            MaxCountSushi = model.MaxCountSushi;
        }

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

        public void UpdateSushi(SushiBarDatabase context, ShopBindingModel model)
        {
            var shopSushi = context.ShopSushi.Where(rec => rec.ShopId == model.Id).ToList();
            if (shopSushi != null && shopSushi.Count > 0)
            {   // удалили те, которых нет в модели
                context.ShopSushi.RemoveRange(shopSushi.Where(rec => !model.ListSushi.ContainsKey(rec.SushiId)));
                context.SaveChanges();
                // обновили количество у существующих записей
                foreach (var updateSushi in shopSushi)
                {
                    updateSushi.Count = model.ListSushi[updateSushi.SushiId].Item2;
                    model.ListSushi.Remove(updateSushi.SushiId);
                }
                context.SaveChanges();
            }
            var shop = context.Shops.First(x => x.Id == Id);
            foreach (var ss in model.ListSushi)
            {
                context.ShopSushi.Add(new ShopSushi
                {
                    Shop = shop,
                    Sushi = context.ListSushi.First(x => x.Id == ss.Key),
                    Count = ss.Value.Item2
                });
                context.SaveChanges();
            }
            _shopSushi = null;
        }
    }
}