using PrecastConcretePlantContracts.BindingModels;
using PrecastConcretePlantContracts.ViewModels;
using PrecastConcretePlantDataModels;
using System.ComponentModel.DataAnnotations.Schema;
using System.ComponentModel.DataAnnotations;
using PrecastConcretePlantDataModels.Models;

namespace PrecastConcretePlantDatabaseImplement
{
    public class Shop : IShopModel
    {
        [Required]
        public string Name { get; private set; } = string.Empty;

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

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

        public DateTime DateOpening { get; private set; }

        private Dictionary<int, (IReinforcedModel, int)>? _cachedReinforceds = null;
        [NotMapped]
        public Dictionary<int, (IReinforcedModel, int)> Reinforceds
        {
            get
            {
                if (_cachedReinforceds == null)
                {
                    using var context = new PrecastConcretePlantDatabase();
                    _cachedReinforceds = ShopReinforceds
                        .ToDictionary(x => x.ReinforcedId, x => (context.Reinforceds
                        .FirstOrDefault(y => y.Id == x.ReinforcedId)! as IReinforcedModel, x.Count));
                }
                return _cachedReinforceds;
            }
        }

        public int Id { get; private set; }

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

        public static Shop? Create(PrecastConcretePlantDatabase context, ShopBindingModel? model)
        {
            if (model == null)
            {
                return null;
            }
            return new Shop()
            {
                Id = model.Id,
                Name = model.Name,
                Address = model.Address,
                DateOpening = model.DateOpening,
                MaxCountReinforceds = model.MaxCountReinforceds,
                ShopReinforceds = model.Reinforceds.Select(x => new ShopReinforced
                {
                    Reinforced = context.Reinforceds.FirstOrDefault(y => y.Id == x.Key)!,
                    Count = x.Value.Item2,
                }).ToList()
            };
        }
        public void Update(ShopBindingModel? model)
        {
            if (model == null)
            {
                return;
            }
            Name = model.Name;
            Address = model.Address;
            DateOpening = model.DateOpening;
        }
        public ShopViewModel GetViewModel => new()
        {
            Id = Id,
            Name = Name,
            Address = Address,
            Reinforceds = Reinforceds,
            DateOpening = DateOpening,
            MaxCountReinforceds = MaxCountReinforceds,
        };

        public void UpdateReinforceds(PrecastConcretePlantDatabase context, ShopBindingModel model)
        {
            var shopReinforceds = context.ShopReinforceds
                .Where(rec => rec.ShopId == model.Id)
                .ToList();
            // удалили те, которых нет в модели
            if (shopReinforceds != null && shopReinforceds.Count > 0)
            {
                context.ShopReinforceds
                    .RemoveRange(shopReinforceds
                    .Where(rec => !model.Reinforceds
                                        .ContainsKey(rec.ReinforcedId)));
                // обновили количество у существующих записей
                foreach (var updateReinforced in shopReinforceds.Where(x => model.Reinforceds.ContainsKey(x.ReinforcedId)))
                {
                    updateReinforced.Count = model.Reinforceds[updateReinforced.ReinforcedId].Item2;
                    model.Reinforceds.Remove(updateReinforced.ReinforcedId);
                }
            }
            var shop = context.Shops.First(x => x.Id == model.Id);
            shop.ShopReinforceds.AddRange(model.Reinforceds.Select(x => new ShopReinforced
            {
                Reinforced = context.Reinforceds.First(y => y.Id == x.Key),
                Count = x.Value.Item2,
            }).Except(shopReinforceds ?? new()));
            context.SaveChanges();
            _cachedReinforceds = null;
        }
    }
}