using FlowerShopContracts.BindingModels;
using FlowerShopContracts.ViewModels;
using FlowerShopDataModels.Models;
using System.ComponentModel.DataAnnotations.Schema;
using System.ComponentModel.DataAnnotations;

namespace FlowerShopDatabaseImplement.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 MaximumFlowers { get; set; }
        private Dictionary<int, (IFlowerModel, int)>? _shopFlowers = null;
        [NotMapped]
        public Dictionary<int, (IFlowerModel, int)> ShopFlowers
        {
            get
            {
                if (_shopFlowers == null)
                {
                    _shopFlowers = Flowers
                            .ToDictionary(x => x.FlowerId, x => (x.Flower as IFlowerModel, x.Count));
                }
                return _shopFlowers;
            }
        }

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

        public static Shop Create(FlowerShopDatabase context, ShopBindingModel model)
        {
            return new Shop()
            {
                Id = model.Id,
                ShopName = model.ShopName,
                Address = model.Address,
                DateOpening = model.DateOpening,
                MaximumFlowers = model.MaximumFlowers,
                Flowers = model.ShopFlowers.Select(x => new ShopFlower
                {
                    Flower = context.Flowers.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;
            MaximumFlowers = model.MaximumFlowers;
        }

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

        public void UpdateFlowers(FlowerShopDatabase context, ShopBindingModel model)
        {
            var shopFlowers = context.ShopFlowers.Where(rec => rec.ShopId == model.Id).ToList();
            if (shopFlowers != null && shopFlowers.Count > 0)
            {
                context.ShopFlowers.RemoveRange(shopFlowers.Where(rec => !model.ShopFlowers.ContainsKey(rec.FlowerId)));
                context.SaveChanges();
                foreach (var updateFlower in shopFlowers)
                {
                    if (model.ShopFlowers.ContainsKey(updateFlower.FlowerId))
                    {
                        updateFlower.Count = model.ShopFlowers[updateFlower.FlowerId].Item2;
                        model.ShopFlowers.Remove(updateFlower.FlowerId);
                    }
                }
                context.SaveChanges();
            }
            var shop = context.Shops.First(x => x.Id == Id);
            foreach (var ic in model.ShopFlowers)
            {
                context.ShopFlowers.Add(new ShopFlower
                {
                    Shop = shop,
                    Flower = context.Flowers.First(x => x.Id == ic.Key),
                    Count = ic.Value.Item2
                });
                context.SaveChanges();
            }
            _shopFlowers = null;
        }
    }
}