PIbd-21_Belianin_N.N._DBMS_BulletinBoard/BulletinBoard/BulletinBoardDatabase/Implements/RegionStorage.cs

using Bogus;
using BulletinBoardContracts.BindingModels;
using BulletinBoardContracts.SearchModels;
using BulletinBoardContracts.StoragesContracts;
using BulletinBoardContracts.ViewModels;
using BulletinBoardDatabase.Models;
using Microsoft.EntityFrameworkCore;
using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Numerics;
using System.Text;
using System.Threading.Tasks;

namespace BulletinBoardDatabase.Implements
{
	public class RegionStorage : IRegionStorage
	{		
		public void ClearEntity()
		{
			using var context = new BulletinBoardDatabase();

			string deleteAllQuery = "DELETE FROM \"Regions\"";
			context.Database.ExecuteSqlRaw(deleteAllQuery);
		}

		public void RegionInsertList(int num)
		{
			using var context = new BulletinBoardDatabase();

			var faker = new Faker("ru");
			for (int i = 0; i < num; ++i)
			{
				var model = new RegionBindingModel
				{
					RegionName = faker.Address.Country(),
				};
				context.Regions.Add(Region.Create(model));
			}
			context.SaveChanges();
		}

		public RegionViewModel? GetElement(RegionSearchModel model)
		{
			if (string.IsNullOrEmpty(model.RegionName) && !model.Id.HasValue)
			{
				return null;
			}

			using var context = new BulletinBoardDatabase();

			return context.Regions
				.FirstOrDefault(x =>
			    (!string.IsNullOrEmpty(model.RegionName) && x.RegionName ==
			    model.RegionName) ||
				(model.Id.HasValue && x.Id == model.Id))
				?.GetViewModel;
		}

		public List<RegionViewModel> GetFilteredList(RegionSearchModel model)
		{
			if (string.IsNullOrEmpty(model.RegionName))
			{
				return new();
			}

			using var context = new BulletinBoardDatabase();

			return context.Regions
				.Where(x => x.RegionName.Contains(model.RegionName))
			    .Select(x => x.GetViewModel)
			    .ToList();
		}

		public List<RegionViewModel> GetFullList()
		{
			using var context = new BulletinBoardDatabase();
			return context.Regions
				.Select(x => x.GetViewModel)
			    .ToList();
		}

		public RegionViewModel? Insert(RegionBindingModel model)
        {
			var newRegion = Region.Create(model);
			if (newRegion == null)
			{
				return null;
			}
			using var context = new BulletinBoardDatabase();

			context.Regions.Add(newRegion);
			context.SaveChanges();
			return newRegion.GetViewModel;
		}

		public RegionViewModel? Update(RegionBindingModel model)
		{
			using var context = new BulletinBoardDatabase();

			var component = context.Regions.FirstOrDefault(x => x.Id == model.Id);
			if (component == null)
			{
				return null;
			}
			component.Update(model);
			context.SaveChanges();
			return component.GetViewModel;
		}

		public RegionViewModel? Delete(RegionBindingModel model)
		{
			using var context = new BulletinBoardDatabase();

			var element = context.Regions.FirstOrDefault(rec => rec.Id == model.Id);
			if (element != null)
			{
				context.Regions.Remove(element);
				context.SaveChanges();
				return element.GetViewModel;
			}
			return null;
		}
	}
}