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

namespace BulletinBoardDatabase.Implements
{
	public class CityStorage : ICityStorage
	{
		public void ClearEntity()
		{
			using var context = new BulletinBoardDatabase();
			string deleteAllQuery = "DELETE FROM \"Cities\"";
			context.Database.ExecuteSqlRaw(deleteAllQuery);
		}

		public CityViewModel? GetElement(CitySearchModel model)
		{
			using var context = new BulletinBoardDatabase();

			return context.Cities.FirstOrDefault(x =>
				(model.Id.HasValue && x.Id == model.Id))
				?.GetViewModel;
		}

		public void CityInsertList(int num, List<RegionViewModel> regions)
		{
			Random rnd = new Random();
			var faker = new Faker("ru");
			using var context = new BulletinBoardDatabase();

			for (int i = 0; i < num; ++i)
			{
				var model = new CityBindingModel
				{
					CityName = faker.Address.City(),
					RegionId = regions[rnd.Next(regions.Count)].Id,
				};
				context.Cities.Add(City.Create(model));
			}
			context.SaveChanges();
		}

		public List<CityViewModel> GetFilteredList(CitySearchModel model)
		{
			using var context = new BulletinBoardDatabase();

			if (model.Id.HasValue)
			{
				return context.Cities
                    .Where(x => x.Id == model.Id)
					.Select(x => x.GetViewModel)
					.ToList();
			}
			else if (model.CityName != string.Empty)
			{
				return context.Cities
                    .Where(x => x.CityName == model.CityName)
					.Select(x => x.GetViewModel)
					.ToList();
			}
			else if (model.RegionId.HasValue)
			{
				return context.Cities
                    .Where(x => x.RegionId <= model.RegionId)
					.Select(x => x.GetViewModel)
					.ToList();
			}

			return null;
		}

		public List<CityViewModel> GetFullList()
		{
			using var context = new BulletinBoardDatabase();
			return context.Cities
                .Include(x => x.Region)
				.Select(x => x.GetViewModel)
				.ToList();
		}

		public CityViewModel? Insert(CityBindingModel model)
		{
			var newCity = City.Create(model);
			if (newCity == null)
			{
				return null;
			}
			using var context = new BulletinBoardDatabase();

			context.Cities.Add(newCity);
			context.SaveChanges();
			return newCity.GetViewModel;
		}

		public CityViewModel? Update(CityBindingModel model)
		{
			using var context = new BulletinBoardDatabase();

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

		public CityViewModel? Delete(CityBindingModel model)
		{
			using var context = new BulletinBoardDatabase();

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