using SushiBarContracts.BindingModels;
using SushiBarContracts.ViewModels;
using SushiBarDataModels.Models;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace SushiBarDatabaseImplement.Models
{
    public class Dish : IDishModel
    {
        [Key]
        public int Id { get; set; }

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

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

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

        [ForeignKey("DishId")]
        public virtual List<DishIngredient> Ingredients { get; set; } = new();

        [ForeignKey("DishId")]
        public virtual List<ChequeItem> ChequeItems { get; set; } = new();

        private Dictionary<int, (IIngredientModel, int)>? _dishIngredients = null;

        [NotMapped]
        public Dictionary<int, (IIngredientModel, int)> DishIngredients
        {
            get
            {
                if (_dishIngredients == null)
                {
                    _dishIngredients = Ingredients.ToDictionary(DishIngredient => DishIngredient.IngredientId, DishIngredient =>
                        (DishIngredient.Ingredient as IIngredientModel, DishIngredient.Count));
                }

                return _dishIngredients;
            }
        }

        public static Dish Create(SushiBarDatabase Context, DishBindingModel Model)
        {
            return new Dish()
            {
                Id = Model.Id,
                DishName = Model.DishName,
                Category = Model.Category,
                Price = Model.Price,
                Ingredients = Model.DishIngredients.Select(x => new DishIngredient
                {
                    Ingredient = Context.Ingredients.First(y => y.Id == x.Key),
                    Count = x.Value.Item2,
                }).ToList()
            };
        }

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

        public DishViewModel ViewModel => new()
        {
            Id = Id,
            DishName = DishName,
            Price = Price,
            Category = Category,
            DishIngredients = DishIngredients,
        };

        public void UpdateIngredients(SushiBarDatabase Context, DishBindingModel Model)
        {
            var IngredientsForThisDish = Context.DishIngredients.Where(x => x.DishId == Model.Id).ToList();

            if (IngredientsForThisDish.Count > 0)
            {
                // Delete DishIngredient records for selected dish if there is no record with such ingredient in passed model
                Context.DishIngredients.RemoveRange(IngredientsForThisDish.Where(x => !Model.DishIngredients.ContainsKey(x.IngredientId)));
                Context.SaveChanges();

                foreach (var DishIngredientToUpdate in IngredientsForThisDish)
                {
                    DishIngredientToUpdate.Count = Model.DishIngredients[DishIngredientToUpdate.IngredientId].Item2;
                    Model.DishIngredients.Remove(DishIngredientToUpdate.IngredientId);
                }

                Context.SaveChanges();
            }

            var Dish = Context.Dishes.First(x => x.Id == Id);

            foreach (var DishIngredient in Model.DishIngredients)
            {
                Context.DishIngredients.Add(new DishIngredient
                {
                    Dish = Dish,
                    Ingredient = Context.Ingredients.First(x => x.Id == DishIngredient.Key),
                    Count = DishIngredient.Value.Item2
                });

                Context.SaveChanges();
            }

            _dishIngredients = null;
        }

        /*
        public void UpdateIngredients(SushiBarDatabase Context, DishBindingModel Model)
        {
            var IngredientsForThisDish = Context.DishIngredients.Where(x => x.DishId == Model.Id).ToList();

            if (IngredientsForThisDish.Count > 0)
            {
                // Delete DishIngredient records for selected dish if there is no record with such ingredient in passed model
                var UsedComponentIds = Model.Ingredients.Select(x => x.IngredientId).ToList();
                Context.DishIngredients.RemoveRange(IngredientsForThisDish.Where(x => !UsedComponentIds.Contains(x.IngredientId)));
                Context.SaveChanges();

                foreach (var DishIngredientToUpdate in IngredientsForThisDish) 
                {
                    DishIngredientToUpdate.Count = Model.Ingredients.First(x => x.IngredientId == DishIngredientToUpdate.IngredientId).Count;
                    Model.Ingredients.Remove(Model.Ingredients.First(x => x.IngredientId == DishIngredientToUpdate.IngredientId));
                }

                Context.SaveChanges();
            }

            var Dish = Context.Dishes.First(x => x.Id == Id);

            foreach (var DishIngredient in Model.Ingredients)
            {
                Context.DishIngredients.Add(new DishIngredient
                {
                    Dish = Dish,
                    Ingredient = Context.Ingredients.First(x => x.Id == DishIngredient.IngredientId),
                    Count = DishIngredient.Count
                });

                Context.SaveChanges();
            }
        }
        */
    }
}