using FishFactoryContracts.BindingModels;
using FishFactoryContracts.ViewModels;
using FishFactoryDataModels.Models;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
namespace FishFactoryDatabaseImplement.Models
{
    public class Canned : ICannedModel
    {
        public int Id { get; set; }
        [Required]
        public string CannedName { get; set; } = string.Empty;
        [Required]
        public double Price { get; set; }
        private Dictionary<int, (IComponentModel, int)>? _cannedComponents =
       null;
        [NotMapped]
        public Dictionary<int, (IComponentModel, int)> CannedComponents
        {
            get
            {
                if (_cannedComponents == null)
                {
                    _cannedComponents = Components
                    .ToDictionary(recPC => recPC.ComponentId, recPC =>
                   (recPC.Component as IComponentModel, recPC.Count));
                }
                return _cannedComponents;
            }
        }
        [ForeignKey("CannedId")]
        public virtual List<CannedComponent> Components { get; set; } = new();
        [ForeignKey("CannedId")]
        public virtual List<Order> Orders { get; set; } = new();
        public static Canned 
            Create(FishFactoryDatabase context,CannedBindingModel model)
        {
            return new Canned()
            {
                Id = model.Id,
                CannedName = model.CannedName,
                Price = model.Price,
                Components = model.CannedComponents.Select(x => new
              CannedComponent
                {
                    Component = context.Components.First(y => y.Id == x.Key),
                    Count = x.Value.Item2
                }).ToList()
            };
        }
        public void Update(CannedBindingModel model)
        {
            CannedName = model.CannedName;
            Price = model.Price;
        }
        public CannedViewModel GetViewModel => new()
        {
            Id = Id,
            CannedName = CannedName,
            Price = Price,
            CannedComponents = CannedComponents
        };
        public void UpdateComponents(FishFactoryDatabase context,
       CannedBindingModel model)
        {
            var cannedComponents = context.CannedComponents.Where(rec =>
           rec.CannedId == model.Id).ToList();
            if (cannedComponents != null && cannedComponents.Count > 0)
            { // удалили те, которых нет в модели
                context.CannedComponents.RemoveRange(cannedComponents.Where(rec
               => !model.CannedComponents.ContainsKey(rec.ComponentId)));
                context.SaveChanges();
                // обновили количество у существующих записей
                foreach (var updateComponent in cannedComponents)
                {
                    updateComponent.Count =
                   model.CannedComponents[updateComponent.ComponentId].Item2;
                    model.CannedComponents.Remove(updateComponent.ComponentId);
                }
                context.SaveChanges();
            }
            var canned = context.Canneds.First(x => x.Id == Id);
            foreach (var pc in model.CannedComponents)
            {
                context.CannedComponents.Add(new CannedComponent
                {
                    Canned = canned,
                    Component = context.Components.First(x => x.Id == pc.Key),
                    Count = pc.Value.Item2
                });
                context.SaveChanges();
            }
            _cannedComponents = null;
        }
    }
}