ISEbd-21.Fedotov.I.A.Diner/Diner/DinerListImplement/Implements/FoodStorage.cs

using DinerContracts.BindingModels;
using DinerContracts.SearchModels;
using DinerContracts.StoragesContracts;
using DinerContracts.ViewModels;
using DinerListImplement.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DinerListImplement.Implements
{
    public class FoodStorage : IFoodStorage
    {
        private readonly DataListSingleton _source;

        public FoodStorage() { 
            _source = DataListSingleton.GetInstance();
        }

        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;
        }

        public FoodViewModel? GetElement(FoodSearchModel model)
        {
            if (string.IsNullOrEmpty(model.ComponentName) && !model.ID.HasValue) { 
                return null;
            }
            foreach (var component in _source.Foods) { 
                if ((!string.IsNullOrEmpty(model.ComponentName) &&
                    component.ComponentName == model.ComponentName) ||
                    (model.ID.HasValue && component.ID == model.ID)) {
                    return component.GetViewModel;
                }
            }
            return null;
        }

        public List<FoodViewModel> GetFilteredList(FoodSearchModel model)
        {
            var result = new List<FoodViewModel>();
            if (string.IsNullOrEmpty(model.ComponentName)) { 
                return result;
            }
            foreach (var component in _source.Foods) { 
                if (component.ComponentName.Contains(model.ComponentName)) {
                    result.Add(component.GetViewModel);
                }
            }
            return result;
        }

        public List<FoodViewModel> GetFullList()
        {
            var result = new List<FoodViewModel>();
            foreach (var component in _source.Foods) {
                result.Add(component.GetViewModel);
            }
            return result;
        }

        public FoodViewModel? Insert(FoodBindingModel model)
        {
            model.ID = 1;
            foreach (var component in _source.Foods) { 
                if (model.ID <= component.ID) { 
                    model.ID = component.ID + 1;
                }
            }
            var newComponent = Food.Create(model);
            if (newComponent == null) return null;
            _source.Foods.Add(newComponent);
            return newComponent.GetViewModel;
        }

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