using CanteenContracts.BindingModels;
using CanteenContracts.View;
using CanteenDataModels.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CanteenDatabaseImplement.Models
{
    public class Dish : IDishModel
    {
        public int Id { get; set; }
        [Required]
        public string DishName { get; set; } = string.Empty;
        [Required]
        public double Price { get; set; }
        [Required]
        public int ManagerId { get; set; }

        private Dictionary<int, (IProductModel, int)>? _dishProducts = null;
        [NotMapped]
        public Dictionary<int, (IProductModel, int)> DishProducts
        {
            get
            {
                if (_dishProducts == null)
                {
                    _dishProducts = Products
                        .ToDictionary(recDP => recDP.ProductId, recDP => (recDP.Product as IProductModel, recDP.CountProducts));
                }
                return _dishProducts;
            }
        }

        [ForeignKey("DishId")]
        public virtual List<DishProduct> Products { get; set; } = new();
        public virtual Manager Manager { get; set; }

        public static Dish Create(CanteenDatabase context, DishBindingModel model)
        {
            return new Dish
            {
                Id = model.Id,
                DishName = model.DishName,
                Price = model.Price,
                ManagerId = model.ManagerId,
                Products = model.DishProducts.Select(x => new DishProduct
                {
                    Product = context.Products.First(y => y.Id == x.Key),
                    CountProducts = x.Value.Item2
                }).ToList()
            };
        }

        public void Update(DishBindingModel model)
        {
            DishName = model.DishName;
            Price = model.Price;
        }

        public DishViewModel GetViewModel => new()
        {
            Id = Id,
            DishName = DishName,
            Price = Price,
            ManagerId = ManagerId,
            DishProducts = DishProducts
        };


        public void UpdateDishProduct(CanteenDatabase context, DishBindingModel model)
        {
            var dishProduct = context.DishProduct.Where(rec => rec.DishId == model.Id).ToList();

            if (dishProduct.Any())
            {
                context.DishProduct.RemoveRange(dishProduct.Where(rec => !model.DishProducts.ContainsKey(rec.ProductId)));
                foreach (var updateProduct in dishProduct)
                {
                    updateProduct.CountProducts = model.DishProducts[updateProduct.ProductId].Item2;
                    model.DishProducts.Remove(updateProduct.ProductId);
                }
                context.SaveChanges();
            }

            var dish = context.Dishes.First(x => x.Id == model.Id);

            foreach (var dp in model.DishProducts.ToList())
            {
                var product = context.Products.First(x => x.Id == dp.Key);
                context.DishProduct.Add(new DishProduct
                {
                    Dish = dish,
                    Product = product,
                    CountProducts = dp.Value.Item2
                });
                model.DishProducts.Remove(dp.Key);
            }

            context.SaveChanges();

            _dishProducts = null;
        }
    }
}