using AbstractIceCreamShopDataModels.Models;
using IceCreamShopContracts.BindingModels;
using IceCreamShopContracts.ViewModels;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace IceCreamShopDatabaseImplement.Models
{
    public class IceCream : IIceCreamModel
    {
        public int Id { get; set; }

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

        [Required]
        public double Price { get; set; }

        private Dictionary<int, (IComponentModel, int)>? _iceCreamComponents = null;

        [NotMapped]
        public Dictionary<int, (IComponentModel, int)> IceCreamComponents
        {
            get
            {
                if (_iceCreamComponents == null)
                {
                    _iceCreamComponents = Components
                            .ToDictionary(recPC => recPC.ComponentId, 
                            recPC => (recPC.Component as IComponentModel, recPC.Count));
                }
                return _iceCreamComponents;
            }
        }

        [ForeignKey("IceCreamId")]
        public virtual List<IceCreamComponent> Components { get; set; } = new();

        [ForeignKey("IceCreamId")]
        public virtual List<Order> Orders { get; set; } = new();
        [ForeignKey("IceCreamId")]
        public virtual List<Shop> Shops { get; set; } = new();

        public static IceCream Create(IceCreamShopDatabase context, IceCreamBindingModel model)
        {
            return new IceCream()
            {
                Id = model.Id,
                IceCreamName = model.IceCreamName,
                Price = model.Price,
                Components = model.IceCreamComponents.Select(x => new IceCreamComponent
                {
                    Component = context.Components.First(y => y.Id == x.Key),
                    Count = x.Value.Item2
                }).ToList()
            };
        }

        public void Update(IceCreamBindingModel model)
        {
            IceCreamName = model.IceCreamName;
            Price = model.Price;
        }

        public IceCreamViewModel GetViewModel => new()
        {
            Id = Id,
            IceCreamName = IceCreamName,
            Price = Price,
            IceCreamComponents = IceCreamComponents
        };

        public void UpdateComponents(IceCreamShopDatabase context, IceCreamBindingModel model)
        {
            var iceCreamComponents = context.IceCreamComponents.Where(rec => rec.IceCreamId == model.Id).ToList();
            if (iceCreamComponents != null && iceCreamComponents.Count > 0)
            {   // удалили те, которых нет в модели
                context.IceCreamComponents.RemoveRange(iceCreamComponents.Where(rec => !model.IceCreamComponents.ContainsKey(rec.ComponentId)));
                context.SaveChanges();
                // обновили количество у существующих записей
                foreach (var updateComponent in iceCreamComponents)
                {
                    updateComponent.Count = model.IceCreamComponents[updateComponent.ComponentId].Item2;
                    model.IceCreamComponents.Remove(updateComponent.ComponentId);
                }
                context.SaveChanges();
            }
            var iceCream = context.IceCreams.First(x => x.Id == Id);
            foreach (var pc in model.IceCreamComponents)
            {
                context.IceCreamComponents.Add(new IceCreamComponent
                {
                    IceCream = iceCream,
                    Component = context.Components.First(x => x.Id == pc.Key),
                    Count = pc.Value.Item2
                });
                context.SaveChanges();
            }
            _iceCreamComponents = null;
        }
    }
}