using DinerContracts.BindingModels;
using DinerContracts.ViewModels;
using DinerDataModels.Models;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;

namespace DinerDataBaseImplement.Models
{
    public class Snack : ISnackModel
    {
        [Required]
        public string ProductName { get; set; } = string.Empty;

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

        public int ID { get; set; }

        private Dictionary<int, (IFoodModel, int)>? _productComponents = null;

        [NotMapped]
        public Dictionary<int, (IFoodModel, int)> ProductComponents
        {
            get
            {
                if (_productComponents == null)
                {
                    _productComponents = Components
                        .ToDictionary(recPC => recPC.ComponentID, recPC => (recPC.Component as IFoodModel, recPC.Count));
                }
                return _productComponents;
            }
        }
        [ForeignKey("SnackID")]
        public virtual List<SnackFood> Components { get; set; } = new();
        public static Snack? Create(DinerDataBase context,SnackBindingModel model)
        {
            return new Snack()
            {
                ID = model.ID,
                ProductName = model.ProductName,
                Price = model.Price,
                Components = model.ProductComponents.Select(x => new SnackFood
                {
                    Component = context.Components.First(y => y.ID == x.Key),
                    Count = x.Value.Item2
                }).ToList()
            };
        }
       
        public void Update(SnackBindingModel model)
        {
            ProductName = model.ProductName;
            Price = model.Price;
        }
        public SnackViewModel GetViewModel => new()
        {
            ID = ID,
            ProductName = ProductName,
            Price = Price,
            ProductComponents = ProductComponents
        };

        public void UpdateComponents(DinerDataBase context, SnackBindingModel model) { 
            var productComponents = context.ProductComponents.Where(rec => rec.SnackID == model.ID).ToList();
            if (ProductComponents != null && ProductComponents.Count > 0) {
                context.ProductComponents.RemoveRange(productComponents.Where(rec => !model.ProductComponents.ContainsKey(rec.ComponentID)));
                context.SaveChanges();
                foreach (var updateComponent in productComponents) {
                    updateComponent.Count = model.ProductComponents[updateComponent.ComponentID].Item2;
                    model.ProductComponents.Remove(updateComponent.ComponentID);
                }
                context.SaveChanges();
            }
            var product = context.Products.First(x => x.ID == ID);
            foreach (var pc in model.ProductComponents) {
                context.ProductComponents.Add(new SnackFood
                {
                    Product = product,
                    Component = context.Components.First(x => x.ID == pc.Key),
                    Count = pc.Value.Item2
                });
                context.SaveChanges();
            }
            _productComponents = null;
        }
    }
}