using HotelContracts.BindingModels;
using HotelContracts.SearchModels;
using HotelContracts.StoragesContracts;
using HotelContracts.ViewModels;
using HotelDataBaseImplement.Models;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Diagnostics.Metrics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace HotelDataBaseImplement.Implements
{
	public class ParticipantStorage : IParticipantStorage
	{
		public List<ParticipantViewModel> GetFullList()
		{
			using var context = new HotelDataBase();

			return context.Participants
				.Include(x => x.ConferenceParticipants)
				.ThenInclude(x => x.Conference)
				.Include(x => x.MealPlanParticipants)
				.ThenInclude(x => x.MealPlan)
				.Include(x => x.Organiser)
				.Select(x => x.GetViewModel)
				.ToList();
		}

		public List<ParticipantViewModel> GetFilteredList(ParticipantSearchModel model)
		{
			if (string.IsNullOrEmpty(model.ParticipantFIO) && !model.OrganiserId.HasValue)
			{
				return new();
			}

			using var context = new HotelDataBase();

			if (model.OrganiserId.HasValue)
			{
				return context.Participants
				.Include(x => x.ConferenceParticipants)
				.ThenInclude(x => x.Conference)
				.Include(x => x.MealPlanParticipants)
				.ThenInclude(x => x.MealPlan)
				.Include(x => x.Organiser)
				.Where(x => x.OrganiserId == model.OrganiserId)
				.Select(x => x.GetViewModel)
				.ToList();
			}

			return context.Participants
				.Include(x => x.ConferenceParticipants)
				.ThenInclude(x => x.Conference)
				.Include(x => x.MealPlanParticipants)
				.ThenInclude(x => x.MealPlan)
				.Include(x => x.Organiser)
				.Where(x => x.ParticipantFIO.Contains(model.ParticipantFIO))
				.Select(x => x.GetViewModel)
				.ToList();
		}

		public ParticipantViewModel? GetElement(ParticipantSearchModel model)
		{
			if (string.IsNullOrEmpty(model.ParticipantFIO) && !model.Id.HasValue)
			{
				return null;
			}

			using var context = new HotelDataBase();

			return context.Participants
				.Include(x => x.ConferenceParticipants)
				.ThenInclude(x => x.Conference)
				.Include(x => x.MealPlanParticipants)
				.ThenInclude(x => x.MealPlan)
				.Include(x => x.Organiser)
				.FirstOrDefault(x => (!string.IsNullOrEmpty(model.ParticipantFIO) && x.ParticipantFIO == model.ParticipantFIO) || (model.Id.HasValue && x.Id == model.Id))?
				.GetViewModel;
		}

		public ParticipantViewModel? Insert(ParticipantBindingModel model)
		{
			using var context = new HotelDataBase();

			var newParticipant = Participant.Create(model);

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

			context.Participants.Add(newParticipant);
			context.SaveChanges();

			return newParticipant.GetViewModel;
		}

		public ParticipantViewModel? Update(ParticipantBindingModel model)
		{
			using var context = new HotelDataBase();

            var participant = context.Participants.FirstOrDefault(x => x.Id == model.Id);

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

			participant.Update(model);
            context.SaveChanges();

            return participant.GetViewModel;
		}

		public ParticipantViewModel? Delete(ParticipantBindingModel model)
		{
			using var context = new HotelDataBase();

			var element = context.Participants.FirstOrDefault(rec => rec.Id == model.Id);

			if (element != null)
			{
				context.Participants.Remove(element);
				context.SaveChanges();

				return element.GetViewModel;
			}

			return null;
		}
	}
}