PIbd22_NikiforovaMV_AutomobilePlant/AutomobilePlantFileImplement/Implements/CarStorage.cs

using AutomobilePlantContracts.BindingModels;
using AutomobilePlantContracts.SearchModels;
using AutomobilePlantContracts.StorageContracts;
using AutomobilePlantContracts.ViewModels;
using AutomobilePlantFileImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection.Metadata;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;

namespace AutomobilePlantFileImplement.Implements
{
    public class CarStorage : ICarStorage
    {
        private readonly DataFileSingleton source;

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

        public CarViewModel? GetElement(CarSearchModel model)
        {
            if (string.IsNullOrEmpty(model.CarName) && !model.Id.HasValue)
            {
                return null;
            }
            return source.Cars
            .FirstOrDefault(x => (!string.IsNullOrEmpty(model.CarName) && x.CarName == model.CarName) || (model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
        }

        public List<CarViewModel> GetFilteredList(CarSearchModel model)
        {
            if (string.IsNullOrEmpty(model.CarName))
            {
                return new();
            }
            return source.Cars
                .Where(x => x.CarName.Contains(model.CarName))
                .Select(x => x.GetViewModel)
                .ToList();
        }

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

        public CarViewModel? Insert(CarBindingModel model)
        {
            model.Id = source.Cars.Count > 0 ? source.Cars.Max(x => x.Id) + 1 : 1;
            var newCar = Car.Create(model);
            if (newCar == null)
            {
                return null;
            }
            source.Cars.Add(newCar);
            source.SaveCars();
            return newCar.GetViewModel;
        }

        public CarViewModel? Update(CarBindingModel model)
        {
            var car = source.Cars.FirstOrDefault(x => x.Id == model.Id);
            if (car == null)
            {
                return null;
            }
            car.Update(model);
            source.SaveCars();
            return car.GetViewModel;
        }
        public CarViewModel? Delete(CarBindingModel model)
        {
            var car = source.Cars.FirstOrDefault(x => x.Id == model.Id);
            if (car == null)
            {
                return null;
            }
            source.Cars.Remove(car);
            source.SaveCars();
            return car.GetViewModel;
        }
    }
}