using System;
using System.Collections.Generic;
using System.Linq;
using Kreta.BusinessLogic.Classes.MobileApi.Common.Co;
using Kreta.BusinessLogic.Classes.MobileApi.Naplo.V2.Co.Post.Ertekeles;
using Kreta.BusinessLogic.Helpers;
using Kreta.Core.ConnectionType;
using Kreta.Core.Validation.Exceptions;
using Kreta.Core.Validation.Exceptions.Enum;
using Kreta.Framework.Entities;
using Kreta.Resources;

namespace Kreta.BusinessLogic.Classes.MobileApi.Naplo.V2.SubqueriesRepo.Post
{
    public static class ErtekelesPostSubqueries
    {
        public static List<ErtekelesResponseCo> CreateOsztalyCsoportErtekeles(int teacherId, DefaultConnectionParameters defaultConnectionParameters, List<OsztalyCsoportErtekelesRequestCo> request)
        {
            var response = new List<ErtekelesResponseCo>();

            if (IsRequestContainsDuplicatedItem(request))
            {
                response.Add(new ErtekelesResponseCo()
                {
                    Exception = new ValidationException("A kérés többször tartalmazza ugyanazt az értékelést!")
                });
                return response;
            }

            var helper = new TanuloErtekelesHelper(new MobileConnectionType(teacherId, defaultConnectionParameters.IntezmenyId, defaultConnectionParameters.IntezmenyAzonosito, defaultConnectionParameters.TanevId));
            foreach (var osztalyCsoportErtekeles in request)
            {
                try
                {
                    helper.SaveTanuloErtekelesListMobilV2(teacherId, osztalyCsoportErtekeles);
                }
                catch (ValidationException execption)
                {
                    response.Add(new ErtekelesResponseCo()
                    {
                        Exception = execption
                    });
                }
                catch (EntityNotFoundException)
                {
                    response.Add(new ErtekelesResponseCo()
                    {
                        Exception = CreateMobileExeption(osztalyCsoportErtekeles.TanuloLista, ErrorResource.AzElemNemTalalhatoVagyToroltek)
                    });
                }
                catch (Exception)
                {
                    response.Add(new ErtekelesResponseCo()
                    {
                        Exception = CreateMobileExeption(osztalyCsoportErtekeles.TanuloLista, ErrorResource.Hiba)
                    });
                }
            }

            return response;
        }

        private static ValidationException CreateMobileExeption(List<TanuloForOsztalyCsoportErtekelesRequestCo> tanuloList, string message)
        {
            var ex = new ValidationException(ValidationErrorType.Undefined, TanuloErtekelesResource.HibasErtekeles);
            foreach (var item in tanuloList)
            {
                ex.AddValidationItem(item.MobilId.ToString(), message);
            }
            return ex;
        }

        private static bool IsRequestContainsDuplicatedItem(List<OsztalyCsoportErtekelesRequestCo> request)
        {
            var requestUniqueItems = new List<(DateTime datum, int tantargyId, string tema, int tanuloErtekelesHashCode)>();

            foreach (var item in request)
            {
                int tanuloErtekelesHashCode = item.TanuloLista.Select(x => $"{x.TanuloId} + {x.Ertekeles.OsztalyzatTipus} + {x.Ertekeles.Szazalek} + {x.Ertekeles.Szoveg}").Aggregate((a, b) => a + b).GetHashCode();
                var requestItem = (item.Datum, item.TantargyId, item.Tema, tanuloErtekelesHashCode);
                if (requestUniqueItems.Contains(requestItem))
                {
                    return true;
                }
                requestUniqueItems.Add(requestItem);
            }

            return false;
        }
    }
}