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; private set; }
        [Required]
        public string DishName { get; private set; } = string.Empty;
        [Required]
        public double Cost { get; private set; }
        [Required]
        public int ManagerId { get; private set; }
        private Dictionary<int, (IProductModel, int)>? _dishProducts = null;
        public Dictionary<int, (IProductModel, int)> DishProduct
        {
            get
            {
                if (_dishProducts == null)
                {
                    _dishProducts = Products
                            .ToDictionary(recPC => recPC.ProductId, recPC => (recPC.Product as IProductModel, recPC.CountProduct));
                }
                return _dishProducts;
            }
        }
        [ForeignKey("DishId")]
        public virtual List<DishProduct> Products { get; set; } = new();
        public static Dish? Create(CanteenDatabase context, DishBindingModel model)
        {
            return new Dish()
            {
                Id = model.Id,
                DishName = model.DishName,
                Cost = model.Cost,
                Products = model.DishProducts.Select(x => new DishProduct
                {
                    Product = context.Products.First(y => y.Id == x.Key)
                }).ToList()
            };
        }

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

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

        public Dictionary<int, (IProductModel, int)> DishProducts => throw new NotImplementedException();

        public void UpdateProduct(CanteenDatabase context, DishBindingModel model)
        {
            var dishProducts = context.DishProducts.Where(record => record.ProductId == model.Id).ToList();
            if (dishProducts != null && dishProducts.Count > 0)
            {
                context.DishProducts.RemoveRange(dishProducts.Where(record => !model.DishProducts.ContainsKey(record.ProductId)));
                context.SaveChanges();
            }

            var product = context.Products.First(x => x.Id == Id);
            foreach (var pc in model.DishProducts)
            {
                context.DishProducts.Add(new DishProduct
                {
                    Product = product,
                    Dish = context.Dishes.First(x => x.Id == pc.Key),
                });
                context.SaveChanges();
            }

            _dishProducts = null;
        }
    }
}