PIbd-23_Vrazhkin_S_A_FurnitureAssembly/FurnitureAssembly/FurnitureAssemblyFileImplement/Implements/FurnitureStorage.cs

using FurnitureAssemblyContracts.BindingModels;
using FurnitureAssemblyContracts.SearchModels;
using FurnitureAssemblyContracts.StoragesContracts;
using FurnitureAssemblyContracts.ViewModels;
using FurnitureAssemblyFileImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FurnitureAssemblyFileImplement.Implements
{
    public class FurnitureStorage : IFurnitureStorage
    {
        private readonly DataFileSingleton source;
        public FurnitureStorage()
        {
            source = DataFileSingleton.GetInstance();
        }
        public FurnitureViewModel? GetElement(FurnitureSearchModel model)
        {
            if (string.IsNullOrEmpty(model.FurnitureName) && !model.Id.HasValue)
            {
                return null;
            }

            return source.Furnitures.FirstOrDefault(x =>
           (model.Id.HasValue && x.Id == model.Id))
            ?.GetViewModel;
        }

        public List<FurnitureViewModel> GetFilteredList(FurnitureSearchModel model)
        {
            if (string.IsNullOrEmpty(model.FurnitureName))
            {
                return new();
            }
            return source.Furnitures
            .Where(x => x.FurnitureName.Contains(model.FurnitureName))
           .Select(x => x.GetViewModel)
           .ToList();
        }

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

        public FurnitureViewModel? Insert(FurnitureBindingModel model)
        {
            model.Id = source.Furnitures.Count > 0 ? source.Furnitures.Max(x =>
          x.Id) + 1 : 1;
            var newFurniture = Furniture.Create(model);
            if (newFurniture == null)
            {
                return null;
            }
            source.Furnitures.Add(newFurniture);
            source.SaveFurnitures();
            return newFurniture.GetViewModel;
        }

        public FurnitureViewModel? Update(FurnitureBindingModel model)
        {
            var furniture = source.Furnitures.FirstOrDefault(x => x.Id == model.Id);
            if (furniture == null)
            {
                return null;
            }
            furniture.Update(model);
            source.SaveFurnitures();
            return furniture.GetViewModel;
        }

        public FurnitureViewModel? Delete(FurnitureBindingModel model)
        {
            var element = source.Furnitures.FirstOrDefault(x => x.Id == model.Id);
            if (element != null)
            {
                source.Furnitures.Remove(element);
                source.SaveFurnitures();
                return element.GetViewModel;
            }
            return null;
        }
    }
}