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

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

namespace StudentPerformanceDatabaseImplement.Implements
{
    public class StudentStorage : IStudentStorage
    {
        public List<StudentViewModel> GetFullList()
        {
            using var context = new StudentsDatabase();
            return context.Students
            .Include(x => x.Format)
            .Select(x => x.GetViewModel)
            .ToList();
        }
        public List<StudentViewModel> GetFilteredList(StudentSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return new();
            }

            using var context = new StudentsDatabase();
            return context.Students
            .Include(x => x.Format)
            .Where(x => x.Id == model.Id)
            .Select(x => x.GetViewModel)
            .ToList();
        }
        public StudentViewModel? GetElement(StudentSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }

            using var context = new StudentsDatabase();
            return context.Students
            .Include(x => x.Format)
            .FirstOrDefault(x => x.Id == model.Id)
            ?.GetViewModel;
        }
        public StudentViewModel? Insert(StudentBindingModel model)
        {
            using var context = new StudentsDatabase();
            var newOrder = Students.Create(context, model);
            if (newOrder == null)
            {
                return null;
            }
            context.Students.Add(newOrder);
            context.SaveChanges();
            return newOrder.GetViewModel;
        }
        public StudentViewModel? Update(StudentBindingModel model)
        {
            using var context = new StudentsDatabase();
            var Order = context.Students.FirstOrDefault(x => x.Id == model.Id);
            if (Order == null)
            {
                return null;
            }
            Order.Update(model, context);
            context.SaveChanges();
            return Order.GetViewModel;
        }
        public StudentViewModel? Delete(StudentBindingModel model)
        {
            using var context = new StudentsDatabase();
            var element = context.Students
                .Include(x => x.Format)
                .FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Students.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}