PIbd-23_Starostin_I.K._Coursework_STO/STODataBaseImplement/ServiceStorage.cs

using STOContracts.BindingModels;
using STOContracts.SearchModels;
using STOContracts.StorageContracts;
using STOContracts.ViewModels;
using STODatabaseImplement;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DatabaseImplement
{
    public class ServiceStorage : IServiceStorage
    {
        public List<ServiceViewModel> GetFullList()
        {
            using var context = new STODatabase();
            return context.Services.Select(x => x.GetViewModel).ToList();
        }

        public List<ServiceViewModel> GetFilteredList(ServiceSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return new();
            }
            using var context = new STODatabase();
            return context.Services.Where(x => x.Id == model.Id).Select(x => x.GetViewModel).ToList();
        }

        public ServiceViewModel? GetElement(ServiceSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }
            using var context = new STODatabase();
            return context.Services.FirstOrDefault(x =>
            (x.Id == model.Id))
                ?.GetViewModel;
        }

        public ServiceViewModel? Insert(ServiceBindingModel model)
        {
            using var context = new STODatabase();
            if (model == null)
                return null;
            var newService = Service.Create(context, model);
            if (newService == null)
            {
                return null;
            }
            context.Services.Add(newService);
            context.SaveChanges();
            return newService.GetViewModel;
        }

        public ServiceViewModel? Update(ServiceBindingModel model)
        {
            using var context = new STODatabase();
            var component = context.Services.FirstOrDefault(x => x.Id == model.Id);
            if (component == null)
            {
                return null;
            }
            component.Update(model);
            context.SaveChanges();
            return component.GetViewModel;
        }

        public ServiceViewModel? Delete(ServiceBindingModel model)
        {
            using var context = new STODatabase();
            var element = context.Services.FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Services.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }

}