using ConfectioneryContracts.BindingModels;
using ConfectioneryContracts.ViewModels;
using ConfectioneryDataModels.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;

namespace ConfectioneryDatabaseImplement.Models
{
    public class Pastry : IPastryModel
    {
        public int Id { get; private set; }

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

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

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

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

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

        public static Pastry? Create(ConfectioneryDatabase context ,PastryBindingModel? model)
        {
            if (model == null)
            {
                return null;
            }
            return new Pastry()
            {
                Id = model.Id,
                PastryName = model.PastryName,
                Price = model.Price,
                Components = model.PastryComponents.Select(x => new PastryComponent
                {
                    Component = context.Components.First(y => y.Id == x.Key),
                    Count = x.Value.Item2
                }).ToList()
            };
        }

        public void Update(PastryBindingModel? model)
        {
            PastryName = model.PastryName;
            Price = model.Price;
        }

        public PastryViewModel GetViewModel => new()
        {
            Id = Id,
            PastryName = PastryName,
            Price = Price,
            PastryComponents = PastryComponents
        };

        public void UpdateComponents(ConfectioneryDatabase context, PastryBindingModel model)
        {
            var PastryComponents = context.PastryComponents.Where(rec => rec.PastryId == model.Id).ToList();
            if (PastryComponents != null && PastryComponents.Count > 0)
            { // удалили те, которых нет в модели
                context.PastryComponents.RemoveRange(PastryComponents.Where(rec => !model.PastryComponents.ContainsKey(rec.ComponentId)));
                context.SaveChanges();
                // обновили количество у существующих записей
                foreach (var updateComponent in PastryComponents)
                {
                    updateComponent.Count = model.PastryComponents[updateComponent.ComponentId].Item2;
                    model.PastryComponents.Remove(updateComponent.ComponentId);
                }
                context.SaveChanges();
            }
            var Pastry = context.Pastries.First(x => x.Id == Id);
            foreach (var pc in model.PastryComponents)
            {
                context.PastryComponents.Add(new PastryComponent
                {
                    Pastry = Pastry,
                    Component = context.Components.First(x => x.Id == pc.Key),
                    Count = pc.Value.Item2
                });
                context.SaveChanges();
            }
            _pastryComponents = null;
        }
    }
}