using SushiBarContracts.BindingModel;
using SushiBarContracts.ViewModels;
using SushiBarDataModels;
using SushiBarDataModels.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;

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

        [Required]
        public string ShopName { get; private set; }

        [Required]
        public string Address { get; private set; }

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

        [Required]
        public int MaxCountSushis { get; private set; }

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

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

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

        public static Shop Create(SushiBarDatabase context, ShopBindingModel model)
        {
            return new Shop()
            {
                Id = model.Id,
                ShopName = model.ShopName,
                Address = model.Address,
                MaxCountSushis = model.MaxCountSushis,
                DateOpening = model.DateOpening,
                Sushis = model.ShopSushis.Select(x => new ShopSushi
                {
                    Sushi = context.Sushis.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;
            MaxCountSushis = model.MaxCountSushis;
        }
        public ShopViewModel GetViewModel => new()
        {
            Id = Id,
            ShopName = ShopName,
            Address = Address,
            DateOpening = DateOpening,
            MaxCountSushis = MaxCountSushis,
            ShopSushis = ShopSushis
        };
        public void UpdateSushis(SushiBarDatabase context, ShopBindingModel model)
        {
            var ShopSushis = context.ShopSushis.Where(rec => rec.ShopId == model.Id).ToList();
            if (ShopSushis != null && ShopSushis.Count > 0)
            {
                // удалили те, которых нет в модели
                context.ShopSushis.RemoveRange(ShopSushis.Where(rec => !model.ShopSushis.ContainsKey(rec.SushiId)));
                context.SaveChanges();
                ShopSushis = context.ShopSushis.Where(rec => rec.ShopId == model.Id).ToList();
                // обновили количество у существующих записей
                foreach (var updateSushi in ShopSushis)
                {
                    updateSushi.Count = model.ShopSushis[updateSushi.SushiId].Item2;
                    model.ShopSushis.Remove(updateSushi.SushiId);
                }
                context.SaveChanges();
            }
            var shop = context.Shops.First(x => x.Id == Id);
            foreach (var elem in model.ShopSushis)
            {
                context.ShopSushis.Add(new ShopSushi
                {
                    Shop = shop,
                    Sushi = context.Sushis.First(x => x.Id == elem.Key),
                    Count = elem.Value.Item2
                });
                context.SaveChanges();
            }
            _shopSushis = null;
        }
    }
}