PIbd-23_Elatomtsev_L.K._SUBD_Device/DeviceDatabaseImplement/Implements/KindStorage.cs

using DeviceContracts.BindingModels;
using DeviceContracts.SearchModels;
using DeviceContracts.StoragesContracts;
using DeviceContracts.ViewModels;
using DeviceDatabaseImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DeviceDatabaseImplement.Implements
{
    public class KindStorage : IKindStorage
    {
        public List<KindViewModel> GetFullList()
        {
            using var context = new DeviceDatabase();
            return context.Kinds.Select(x => x.GetViewModel).ToList();
        }

        public List<KindViewModel> GetFilteredList(KindSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Title) &&
                model.Frequency == 0)
            {
                return new();
            }

            using var context = new DeviceDatabase();
            return context.Kinds
                .Where(x => (string.IsNullOrEmpty(model.Title) ||
                x.Title == model.Title) && (model.Frequency == 0 ||
                x.Frequency == model.Frequency))
                .Select(x => x.GetViewModel).ToList();
        }

        public KindViewModel? GetElement(KindSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Title) &&
                model.Frequency == 0)
            {
                return null;
            }

            using var context = new DeviceDatabase();
            return context.Kinds
                .FirstOrDefault(x => (string.IsNullOrEmpty(model.Title) ||
                x.Title == model.Title) && (model.Frequency == 0 ||
                x.Frequency == model.Frequency))
                ?.GetViewModel;
        }

        public KindViewModel? Insert(KindBindingModel model)
        {
            var newKind = Kind.Create(model);
            if (newKind == null)
            {
                return null;
            }

            using var context = new DeviceDatabase();
            context.Kinds.Add(newKind);
            context.SaveChanges();
            return newKind.GetViewModel;
        }

        public KindViewModel? Update(KindBindingModel model)
        {
            using var context = new DeviceDatabase();
            var kind = context.Kinds
                .FirstOrDefault(x => x.Id == model.Id);

            if (kind == null)
            {
                return null;
            }

            kind.Update(model);
            context.SaveChanges();
            return kind.GetViewModel;
        }

        public KindViewModel? Delete(KindBindingModel model)
        {
            using var context = new DeviceDatabase();
            var kind = context.Kinds
                .FirstOrDefault(x => x.Id == model.Id);

            if (kind != null)
            {
                context.Kinds.Remove(kind);
                context.SaveChanges();
                return kind.GetViewModel;
            }

            return null;
        }
    }
}