PIbd-31_Alekseev.I.S._COP_3/StudentPerformanceDatabaseImplement/Implements/FormatStorage.cs

using StudentPerformanceContracts.BindingModels;
using StudentPerformanceContracts.SearchModels;
using StudentPerformanceContracts.StorageContracts;
using StudentPerformanceContracts.ViewModels;
using StudentPerformanceDatabaseImplement.Models;
using Microsoft.EntityFrameworkCore;

namespace StudentPerformanceDatabaseImplement.Implements
{
    public class FormatStorage : IFormatStorage
    {
        public List<FormatViewModel> GetFullList()
        {
            using var context = new StudentsDatabase();
            return context.Formats
            .Select(x => x.GetViewModel)
            .ToList();
        }
        public List<FormatViewModel> GetFilteredList(FormatSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return new();
            }
            using var context = new StudentsDatabase();
            return context.Formats
            .Where(x => x.Id == model.Id)
            .Select(x => x.GetViewModel)
            .ToList();
        }
        public FormatViewModel? GetElement(FormatSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }
            using var context = new StudentsDatabase();
            return context.Formats
            .FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id)
            ?.GetViewModel;
        }
        public FormatViewModel? Insert(FormatBindingModel model)
        {
            var newcity = Formats.Create(model);
            if (newcity == null)
            {
                return null;
            }
            using var context = new StudentsDatabase();
            context.Formats.Add(newcity);
            context.SaveChanges();
            return newcity.GetViewModel;
        }
        public FormatViewModel? Update(FormatBindingModel model)
        {
            using var context = new StudentsDatabase();
            var component = context.Formats.FirstOrDefault(x => x.Id == model.Id);
            if (component == null)
            {
                return null;
            }
            component.Update(model);
            context.SaveChanges();
            return component.GetViewModel;
        }
        public FormatViewModel? Delete(FormatBindingModel model)
        {
            using var context = new StudentsDatabase();
            var element = context.Formats.FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Formats.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}