FoodOrders/AbstractFoodOrders/AbstractShopListImplement/Implements/FoodStorage.cs

using AbstractShopContracts.BindingModels;
using AbstractShopContracts.SearchModels;
using AbstractShopContracts.StoragesContracts;
using AbstractShopContracts.ViewModels;
using AbstractShopListImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AbstractShopListImplement.Implements
{
    public class FoodStorage : IFoodStorage
    {
        private readonly DataListSingleton _source;
        public FoodStorage()
        {
            _source = DataListSingleton.GetInstance();
        }
        public List<FoodViewModel> GetFullList()
        {
            var result = new List<FoodViewModel>();

            foreach (var work in _source.Foods)
            {
                result.Add(work.GetViewModel);
            }

            return result;
        }

        public List<FoodViewModel> GetFilteredList(FoodSearchModel model)
        {
            var result = new List<FoodViewModel>();

            if (string.IsNullOrEmpty(model.FoodName))
            {
                return result;
            }

            foreach (var work in _source.Foods)
            {
                if (work.FoodName.Contains(model.FoodName))
                {
                    result.Add(work.GetViewModel);
                }
            }

            return result;
        }

        public FoodViewModel? GetElement(FoodSearchModel model)
        {
            if (string.IsNullOrEmpty(model.FoodName) && !model.Id.HasValue)
            {
                return null;
            }

            foreach (var work in _source.Foods)
            {
                if ((!string.IsNullOrEmpty(model.FoodName) && work.FoodName == model.FoodName) || (model.Id.HasValue && work.Id == model.Id))
                {
                    return work.GetViewModel;
                }
            }

            return null;
        }

        public FoodViewModel? Insert(FoodBindingModel model)
        {
            model.Id = 1;

            foreach (var work in _source.Foods)
            {
                if (model.Id <= work.Id)
                {
                    model.Id = work.Id + 1;
                }
            }

            var newWork = Food.Create(model);

            if (newWork == null)
            {
                return null;
            }

            _source.Foods.Add(newWork);

            return newWork.GetViewModel;
        }

        public FoodViewModel? Update(FoodBindingModel model)
        {
            foreach (var work in _source.Foods)
            {
                if (work.Id == model.Id)
                {
                    work.Update(model);
                    return work.GetViewModel;
                }
            }

            return null;
        }

        public FoodViewModel? Delete(FoodBindingModel model)
        {
            for (int i = 0; i < _source.Foods.Count; ++i)
            {
                if (_source.Foods[i].Id == model.Id)
                {
                    var element = _source.Foods[i];
                    _source.Foods.RemoveAt(i);
                    return element.GetViewModel;
                }
            }

            return null;
        }
    }
}