using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.IO;
using System.Linq;
using System.Runtime.Caching;
using Kreta.BusinessLogic.Classes;
using Kreta.BusinessLogic.HelperClasses;
using Kreta.BusinessLogic.HelperClasses.ImportCo;
using Kreta.BusinessLogic.Logic;
using Kreta.Core;
using Kreta.Core.ConnectionType;
using Kreta.DataAccessManual;
using Kreta.Enums.ManualEnums;
using Kreta.Enums.ManualEnums.ImportExport;
using Kreta.Resources;
using Newtonsoft.Json;

namespace Kreta.BusinessLogic.Helpers.ImportExport
{
    public class TanmenetImportExportHelper : LogicBase
    {
        #region Fields

        private readonly string _importObjectCacheKey;

        #endregion Fields

        #region Properties

        public static Dictionary<int, string> ImportHeaderList => new Dictionary<int, string>
        {
            { 00, ImportExportTanmenetResource.ImportHeaderNameOraszam },
            { 01, ImportExportTanmenetResource.ImportHeaderNameTema }
        };

        public TanmenetImportCo ImportCo
        {
            get => (TanmenetImportCo)Cache.Get(_importObjectCacheKey);
            set
            {
                if (ImportCo != null)
                {
                    Cache.Remove(_importObjectCacheKey);
                }

                Cache.Add(_importObjectCacheKey, value, new CacheItemPolicy { SlidingExpiration = TimeSpan.FromMinutes(30) });
            }
        }

        #endregion Properties

        #region Constructors

        public TanmenetImportExportHelper(IConnectionType connectionType) : base(connectionType)
        {
            _importObjectCacheKey = $"{nameof(TanmenetImportCo)}_{IntezmenyId}_{FelhasznaloId}_ImportObjectCacheKey";
        }

        #endregion Constructors

        public void SetImportCo(List<List<string>> importData, int tantargyfelosztasId, bool isFromSzervezet)
        {
            var importCo = GetImportCoFromImportData(importData, tantargyfelosztasId, isFromSzervezet);
            importCo.ImportMuvelet = (int)ImportMuveletEnum.DeleteAndInsert;

            SetNemImportalhatoSorokByValidation(importCo);

            SetOperationAndNemImportalhatoSorokByOperation(importCo);

            var mainImportJsonItemList = new List<TanmenetImportJsonItemCo>(importCo.MainImportItemList.Select(x => new TanmenetImportJsonItemCo(x, importCo.Tantargyfelosztas, TanevId, IntezmenyId, FelhasznaloId)));
            importCo.MainImportJsonItemList = mainImportJsonItemList;

            ImportCo = importCo;
        }

        private static void SetNemImportalhatoSorokByValidation(TanmenetImportCo importCo)
        {
            Dictionary<int, List<ValidationResult>> validationResultDictionary = importCo.Validate();

            //NOTE: Azokat a sorokat, amelyek hibásak beletesszük a NemImportalhatoItemList-be!
            foreach (TanmenetImportItemCo importItem in importCo.MainImportItemList.Where(x => validationResultDictionary.Keys.Contains(x.LineNumber)))
            {
                IEnumerable<ValidationResult> validationResultList = validationResultDictionary[importItem.LineNumber];
                importItem.ErrorList = validationResultList.Select(x => x.ErrorMessage).ToList();
                importCo.NemImportalhatoItemList.Add(importItem);
            }

            //NOTE: Azokat a sorokat, amelyek bekerültek a NemImportalhatoItemList-be, azokat kiveszzük a MainImportItemList-ből!
            importCo.MainImportItemList.RemoveRange(importCo.NemImportalhatoItemList);
        }

        private void SetOperationAndNemImportalhatoSorokByOperation(TanmenetImportCo importCo)
        {
            foreach (TanmenetImportItemCo importItem in importCo.MainImportItemList)
            {
                importItem.Operation = (int)ImportItemOperationEnum.Insert;
            }
        }

        private TanmenetImportCo GetImportCoFromImportData(List<List<string>> importData, int tantargyfelosztasId, bool isFromSzervezet)
        {
            var tantargyfelosztasCoList = new TantargyFelosztasHelper(ConnectionType).GetTantargyfelosztasCoList(alkalmazottId: FelhasznaloId, isFromSzervezet: isFromSzervezet);

            if (isFromSzervezet)
            {
                var szervezetHelper = new SzervezetHelper(ConnectionType);
                var alkalmazottSzervezetId = szervezetHelper.GetAlkalmazottSzervezetId(FelhasznaloId);
                var lathatoSzervezetIdList = szervezetHelper.GetLathatoSzervezetIdList(alkalmazottSzervezetId, SzervezetAdatokHalmazaEnum.SzervezetEsAlSzervezetek);

                tantargyfelosztasCoList.RemoveAll(x =>
                {
                    if (x.SzervezetId.IsEntityId())
                    {
                        return !lathatoSzervezetIdList.Contains(x.SzervezetId.Value);
                    }

                    return true;
                });
            }

            var importCo = new TanmenetImportCo
            {
                Tantargyfelosztas = tantargyfelosztasCoList.Single(x => x.Id == tantargyfelosztasId),
            };

            var tanmenetCoList = new TanmenetHelper(ConnectionType).GetTanmenetCoList(FelhasznaloId).Where(x => x.TantargyfelosztasId == tantargyfelosztasId).ToList();

            var lineNumber = 1;
            foreach (var importDataRow in importData.Skip(1))
            {
                var importItemCo = new TanmenetImportItemCo
                {
                    LineNumber = lineNumber,

                    OraszamImportData = importDataRow[ImportHeaderList.GetKeyByUniqueValue(ImportExportTanmenetResource.ImportHeaderNameOraszam)],
                    TemaImportData = importDataRow[ImportHeaderList.GetKeyByUniqueValue(ImportExportTanmenetResource.ImportHeaderNameTema)]
                };

                if (importCo.Tantargyfelosztas != null && importItemCo.OraSorszam.IsNotNullAndPositive())
                {
                    importItemCo.Tanmenet = tanmenetCoList.SingleOrDefault(x =>
                        x.TantargyfelosztasId == importCo.Tantargyfelosztas.Id &&
                        x.OraSorszam == importItemCo.OraSorszam
                    );
                }

                var md5HashInput = importItemCo.OraSorszam?.ToString();
                importItemCo.CompareHash = ImportExportHelper.GetMd5Hash(md5HashInput);

                importCo.MainImportItemList.Add(importItemCo);

                lineNumber++;
            }

            return importCo;
        }

        #region Template

        public MemoryStream GetTemplate()
        {
            List<SimpleExportColumnCo> simpleExportColumnCos = SimpleExportLogic.GetSimpleExportColumnCos<TanmenetItemCo>(TanmenetItemCo.TanmenetExportAttributeId, GetDefaultDropDownColumnSourceDictionary());
            return SimpleExportLogic.GetTemplate(ImportExportTanmenetResource.ImportDefaultSheetName, simpleExportColumnCos);
        }

        #endregion Template

        #region Export

        public MemoryStream GetExport(int tantargyfelosztasId)
        {
            List<TanmenetItemCo> coList = new TanmenetHelper(ConnectionType).GetTanmenetCoList(FelhasznaloId).Where(x => x.TantargyfelosztasId == tantargyfelosztasId).ToList();
            List<SimpleExportColumnCo> simpleExportColumnCos = SimpleExportLogic.GetSimpleExportColumnCos<TanmenetItemCo>(TanmenetItemCo.TanmenetExportAttributeId, GetDefaultDropDownColumnSourceDictionary());
            return SimpleExportLogic.GetExport(ImportExportTanmenetResource.ImportDefaultSheetName, simpleExportColumnCos, coList, TanevId);
        }

        public MemoryStream GetNemImportalhatoSorokExport()
        {
            List<TanmenetImportItemCo> coList = ImportCo.NemImportalhatoItemList;
            List<SimpleExportColumnCo> simpleExportColumnCos = SimpleExportLogic.GetSimpleExportColumnCos<TanmenetImportItemCo>(TanmenetImportItemCo.NemImportalhatoSorokExportAttributeId, GetDefaultDropDownColumnSourceDictionary());
            return ImportExportHelper.NemImportalhatoSorokExport(ImportExportTanmenetResource.ImportDefaultSheetName, simpleExportColumnCos, coList, TanevId);
        }

        #endregion Export

        public void Import(object importJsonObject, int importMuvelet, int tantargyId, int osztalyCsoportId)
        {
            string importJson = JsonConvert.SerializeObject(importJsonObject);
            bool isTorles = importMuvelet == (int)ImportMuveletEnum.DeleteAndInsert;
            Dal.CustomConnection.Run(ConnectionType, dalHandler => dalHandler.ImportExportDal().TanmenetImport(IntezmenyId, TanevId, FelhasznaloId, importJson, isTorles, tantargyId, osztalyCsoportId));
        }

        private Dictionary<string, IList<string>> GetDefaultDropDownColumnSourceDictionary()
        {
            //NOTE: Create dropdown lists
            var dropDownColumnSourceDictionary = new Dictionary<string, IList<string>>();
            return dropDownColumnSourceDictionary;
        }
    }
}