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

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

namespace FurnitureAssemblyFileImplement.Implements
{
    public class ComponentStorage : IComponentStorage
    {
        private readonly DataFileSingleton source;
        public ComponentStorage()
        {
            source = DataFileSingleton.GetInstance();
        }
        public List<ComponentViewModel> GetFullList()
        {
            return source.Components
            .Select(x => x.GetViewModel)
           .ToList();
        }
        public List<ComponentViewModel> GetFilteredList(ComponentSearchModel
       model)
        {
            if (string.IsNullOrEmpty(model.ComponentName))
            {
                return new();
            }
            return source.Components
            .Where(x => x.ComponentName.Contains(model.ComponentName))
           .Select(x => x.GetViewModel)
           .ToList();
        }
        public ComponentViewModel? GetElement(ComponentSearchModel model)
        {
            if (string.IsNullOrEmpty(model.ComponentName) && !model.Id.HasValue)
            {
                return null;
            }
            return source.Components
            .FirstOrDefault(x =>
           (!string.IsNullOrEmpty(model.ComponentName) && x.ComponentName ==
           model.ComponentName) ||
            (model.Id.HasValue && x.Id == model.Id))
            ?.GetViewModel;
        }

        public ComponentViewModel? Insert(ComponentBindingModel model)
        {
            model.Id = source.Components.Count > 0 ? source.Components.Max(x =>
           x.Id) + 1 : 1;
            var newComponent = Component.Create(model);
            if (newComponent == null)
            {
                return null;
            }
            source.Components.Add(newComponent);
            source.SaveComponents();
            return newComponent.GetViewModel;
        }
        public ComponentViewModel? Update(ComponentBindingModel model)
        {
            var component = source.Components.FirstOrDefault(x => x.Id ==
           model.Id);
            if (component == null)
            {
                return null;
            }
            component.Update(model);
            source.SaveComponents();
            return component.GetViewModel;
        }
        public ComponentViewModel? Delete(ComponentBindingModel model)
        {
            var element = source.Components.FirstOrDefault(x => x.Id ==
           model.Id);
            if (element != null)
            {
                source.Components.Remove(element);
                source.SaveComponents();
                return element.GetViewModel;
            }
            return null;
        }

    }
}