PIbd-32_Artamonova_T.V._COP_2/UniversityDatabaseImplement/Implements/DirectionStorage.cs

using UniversityContracts.BindingModels;
using UniversityContracts.SearchModels;
using UniversityContracts.StoragesContracts;
using UniversityContracts.ViewModels;
using UniversityDatabaseImplement.Models;

namespace UniversityDatabaseImplement.Implements
{
    public class DirectionStorage : IDirectionStorage
    {
        public List<DirectionViewModel> GetFullList()
        {
            using var context = new UniversityDatabase();
            return context.Directions
            .Select(x => x.GetViewModel)
            .ToList();
        }
        public List<DirectionViewModel> GetFilteredList(DirectionBindingModel model)
        {
            if (string.IsNullOrEmpty(model.Name))
            {
                return new();
            }
            using var context = new UniversityDatabase();
            return context.Directions
            .Select(x => x.GetViewModel)
            .ToList();
        }
        public DirectionViewModel? GetElement(DirectionBindingModel model)
        {
            if (string.IsNullOrEmpty(model.Name) && !model.Id.HasValue)
            {
                return null;
            }
            using var context = new UniversityDatabase();
            return context.Directions
             .FirstOrDefault(x => (!string.IsNullOrEmpty(model.Name) &&
            x.Name == model.Name) ||
            (model.Id.HasValue && x.Id == model.Id))
            ?.GetViewModel;
        }
        public DirectionViewModel? Insert(DirectionBindingModel model)
        {
            using var context = new UniversityDatabase();
            var newDirection = Direction.Create(model);
            if (newDirection == null)
            {
                return null;
            }
            context.Directions.Add(newDirection);
            context.SaveChanges();
            return newDirection.GetViewModel;
        }
        public DirectionViewModel? Update(DirectionBindingModel model)
        {
            using var context = new UniversityDatabase();
            var direction = context.Directions.FirstOrDefault(rec => rec.Id == model.Id);
            if (direction == null)
            {
                return null;
            }
            direction.Update(model);
            context.SaveChanges();
            return direction.GetViewModel;
        }
        public DirectionViewModel? Delete(DirectionBindingModel model)
        {
            using var context = new UniversityDatabase();
            var element = context.Directions
            .FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Directions.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}