Pibd-21_Ievlewa_MD._PrecastConcretePlant/PrecastConcretePlant/PrecastConcretePlantDatabaseImplement/Implements/ComponentStorage.cs

using PrecastConcretePlantContracts.BindingModels;
using PrecastConcretePlantContracts.SearchModels;
using PrecastConcretePlantContracts.StoragesContracts;
using PrecastConcretePlantContracts.ViewModels;
using PrecastConcretePlantDatabaseImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PrecastConcretePlantDatabaseImplement.Implements
{
    public class ComponentStorage : IComponentStorage
    {
        public List<ComponentViewModel> GetFullList()
        {
            using var context = new PrecastConcretePlantDatabase();//подключение к бд, далее - запросы
            return context.Components
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public List<ComponentViewModel> GetFilteredList(ComponentSearchModel model)
        {
            if (string.IsNullOrEmpty(model.ComponentName))
            {
                return new();
            }
            using var context = new PrecastConcretePlantDatabase();
            return context.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;
            }
            using var context = new PrecastConcretePlantDatabase();
            return context.Components
                    .FirstOrDefault(x => (!string.IsNullOrEmpty(model.ComponentName) && x.ComponentName == model.ComponentName) 
                    || (model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
        }
        public ComponentViewModel? Insert(ComponentBindingModel model)
        {
            var newComponent = Component.Create(model);
            if (newComponent == null)
            {
                return null;
            }
            using var context = new PrecastConcretePlantDatabase();
            context.Components.Add(newComponent);
            context.SaveChanges();
            return newComponent.GetViewModel;
        }
        public ComponentViewModel? Update(ComponentBindingModel model)
        {
            using var context = new PrecastConcretePlantDatabase();
            var component = context.Components.FirstOrDefault(x => x.Id == model.Id);
            if (component == null)
            {
                return null;
            }
            component.Update(model);
            context.SaveChanges();//для сохранения изменений не в копии бд а в самой бд
            return component.GetViewModel;
        }
        public ComponentViewModel? Delete(ComponentBindingModel model)
        {
            using var context = new PrecastConcretePlantDatabase();
            var element = context.Components.FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Components.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}