PIbd-21_Putincev_D.M._FoodOrders/FoodOrders/FoodOrdersFileImplement/Implements/DishStorage.cs

using FoodOrdersContracts.BindingModels;
using FoodOrdersContracts.SearchModels;
using FoodOrdersContracts.StoragesContracts;
using FoodOrdersContracts.ViewModels;
using FoodOrdersFileImplement.Models;

namespace FoodOrdersFileImplement.Implements
{
    public class DishStorage : IDishStorage
    {
        private readonly DataFileSingleton source;

        public DishStorage()
        {
            source = DataFileSingleton.GetInstance();
        }

        public List<DishViewModel> GetFullList()
        {
            return source.Dishs
                    .Select(x => x.GetViewModel)
                    .ToList();
        }

        public List<DishViewModel> GetFilteredList(DishSearchModel model)
        {
            if (string.IsNullOrEmpty(model.DishName))
            {
                return new();
            }
            return source.Dishs
                    .Where(x => x.DishName.Contains(model.DishName))
                    .Select(x => x.GetViewModel)
                    .ToList();
        }

        public DishViewModel? GetElement(DishSearchModel model)
        {
            if (string.IsNullOrEmpty(model.DishName) && !model.Id.HasValue)
            {
                return null;
            }
            return source.Dishs
                    .FirstOrDefault(x => (!string.IsNullOrEmpty(model.DishName) && x.DishName == model.DishName) ||
                                        (model.Id.HasValue && x.Id == model.Id))
                    ?.GetViewModel;
        }

        public DishViewModel? Insert(DishBindingModel model)
        {
            model.Id = source.Dishs.Count > 0 ? source.Dishs.Max(x => x.Id) + 1 : 1;
            var newDish = Dish.Create(model);
            if (newDish == null)
            {
                return null;
            }
            source.Dishs.Add(newDish);
            source.SaveDishs();
            return newDish.GetViewModel;
        }

        public DishViewModel? Update(DishBindingModel model)
        {
            var Dish = source.Dishs.FirstOrDefault(x => x.Id == model.Id);
            if (Dish == null)
            {
                return null;
            }
            Dish.Update(model);
            source.SaveDishs();
            return Dish.GetViewModel;
        }

        public DishViewModel? Delete(DishBindingModel model)
        {
            var element = source.Dishs.FirstOrDefault(x => x.Id == model.Id);
            if (element != null)
            {
                source.Dishs.Remove(element);
                source.SaveDishs();
                return element.GetViewModel;
            }
            return null;
        }
    }
}