using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using Kreta.BusinessLogic.Classes;
using Kreta.BusinessLogic.HelperClasses;
using Kreta.BusinessLogic.HelperClasses.ImportCo;
using Kreta.BusinessLogic.Helpers.ImportExport;
using Kreta.Core.ConnectionType;
using Kreta.DataAccessManual;
using Kreta.DataAccessManual.Interfaces;
using Kreta.DataAccessManual.ParameterClasses;
using Kreta.DataAccessManual.Util;
using Kreta.Enums.ManualEnums;
using Kreta.Enums.ManualEnums.ImportExport;
using Kreta.Resources;

namespace Kreta.BusinessLogic.Helpers
{
    public class OrarendTorleseHelper : LogicBase
    {
        public OrarendTorleseHelper(IConnectionType connectionType) : base(connectionType)
        {
        }

        public List<(string Text, string Value)> GetFeladatellatasiHelyek(bool isKellOcsDarabszam = false)
        {
            var ret = new List<(string Text, string Value)>();
            Dal.CustomConnection.Run(ConnectionType, (h) =>
            {
                var dal = h.FeladatEllatasiHelyDal();
                var ds = dal.GetFeladatEllatasiHelyekForkDropDown(TanevId);
                ret.AddRange(ds.Tables[0].AsEnumerable().OrderBy(x => x.Field<int>("MukodesiHelyID")).ThenBy(x => x.Field<int>("OktNevFel")).Select(x => (Text: x.Field<string>("Nev"), Value: x.Field<int>("ID").ToString())));
                if (isKellOcsDarabszam)
                {
                    for (int i = 0; i < ret.Count; i++)
                    {
                        var felhely = ret[i];
                        var ocsRows = dal.GetFeladatellatasiHelyOsztalycsoportjai(int.Parse(felhely.Value), TanevId).Tables[0].AsEnumerable();
                        int osztalySzam = ocsRows.Count(x => x.Field<string>("Tipus") == "Osztály");
                        int csoportSzam = ocsRows.Count(x => x.Field<string>("Tipus") == "Csoport");
                        felhely.Text += $" (Osztályok száma: {osztalySzam}, Csoportok száma: {csoportSzam})";
                        ret[i] = felhely;
                    }
                }
            });
            return ret;
        }

        public (DateTime EvKezdoNapja, DateTime EvUtolsoNapja) GetMinMaxDatumValaszto()
        {
            var tanevInfo = new TanevHelper(ConnectionType).GetTanevInfo();
            return (EvKezdoNapja: tanevInfo.KezdoNap, EvUtolsoNapja: tanevInfo.UtolsoNap);
        }

        public List<(string Text, string Value)> GetNezetTipusok()
        {
            return Enum.GetValues(typeof(OrarendekTorleseNezetTipusEnum)).OfType<OrarendekTorleseNezetTipusEnum>().Select(x => (Text: x.GetDisplayName(TanevId), Value: x.ToString())).ToList();
        }

        public List<(string FileName, MemoryStream FileStream)> OrarendekTorlese(OrarendekTorleseCo orarendekTorleseCo)
        {
            return Dal.CustomConnection.Run(ConnectionType, (h) =>
            {
                var orarendiOraDal = h.OrarendiOra();

                var orarendekTorlesePco = orarendekTorleseCo.ConvertToPco(TanevId, FelhasznaloId);

                var exportok = GetExportok(h, orarendekTorlesePco);

                orarendiOraDal.OrarendekTorlese(orarendekTorlesePco);

                return exportok;
            });
        }

        private List<(string FileName, MemoryStream FileStream)> GetExportok(IDalHandler dalHandler, OrarendekTorlesePco orarendekTorlesePco)
        {
            var orarendiOraDal = dalHandler.OrarendiOra();
            var importExportDal = dalHandler.ImportExportDal();

            var exportAdatokDs = orarendiOraDal.GetExportAdatokForOrarendekTorlese(orarendekTorlesePco);

            var orarendExportAdatokDs = importExportDal.GetOrarendExcelExportData(TanevId, orarendekTorlesePco.IntervallumKezdete, orarendekTorlesePco.IntervallumVege, isOraErvenyessegiIdovel: true, isIdoszakonKivuliElemekMegjelenitese: true);

            var results = new List<(string FileName, MemoryStream FileStream)>();

            var orarendImportExportHelper = new OrarendImportExportHelper(new DalHandlerConnectionType(ConnectionType, dalHandler));

            var exportAdatok = exportAdatokDs.Tables[0].AsEnumerable().Select(r => new OrarendekTorleseExportAdatokCo
            {
                Id = r.Field<int>("Id"),
                ErvenyessegKezdete = r.Field<DateTime>("ErvenyessegKezdete"),
                ErvenyessegVege = r.Field<DateTime>("ErvenyessegVege"),
                IsNapirend = r.Field<bool>("IsNapirend")
            }).ToList();

            var existsTanora = exportAdatok.Any(a => !a.IsNapirend);
            var existsNapirendiOra = exportAdatok.Any(a => a.IsNapirend);
            var orarendExportList = GetOrarendExportList(orarendekTorlesePco.NezetTipus, existsTanora, existsNapirendiOra);
            foreach (var (FileName, OrarendExportSettings) in orarendExportList)
            {
                var exportDataSet = CreateExportDataSet(exportAdatok, orarendExportAdatokDs, OrarendExportSettings.IsNapirendImport);
                var workbookMemoryStream = orarendImportExportHelper.GetWorkbook(OrarendExportSettings, exportDataSet);
                results.Add((FileName, workbookMemoryStream));
            }

            return results;
        }

        private IEnumerable<(string FileName, OrarendImportFileUploadCo OrarendExportSettings)> GetOrarendExportList(OrarendekTorleseNezetTipusEnum nezetTipus, bool existsTanora, bool existsNapirendiOra)
        {
            var results = new List<(string FileName, OrarendImportFileUploadCo OrarendExportSettings)>();

            if (existsTanora && nezetTipus != OrarendekTorleseNezetTipusEnum.Napirend)
            {
                results.Add((ImportExportOrarendResource.ExportFileName,
                    new OrarendImportFileUploadCo
                    {
                        OrarendImportTipus = (int)OrarendImportTipusEnum.Import,
                        IsNapirendImport = false,
                        WorksheetName = ImportExportOrarendResource.ImportDefaultSheetNameOrarend,
                        ExcelHeaderList = OrarendImportExportHelper.ImportHeaderList
                    }));

                results.Add((ImportExportOrarendResource.ExportFileNameErvenyessegiIdovel,
                    new OrarendImportFileUploadCo
                    {
                        OrarendImportTipus = (int)OrarendImportTipusEnum.ErvenyessegiIdovelImport,
                        IsNapirendImport = false,
                        WorksheetName = ImportExportOrarendResource.ImportDefaultSheetNameOrarendErvenyessegiIdovel,
                        ExcelHeaderList = OrarendImportExportHelper.ImportHeaderListOraErvenyessegiIdovel
                    }));
            }

            if (existsNapirendiOra && nezetTipus != OrarendekTorleseNezetTipusEnum.Tanora)
            {
                results.Add((ImportExportOrarendResource.ExportFileNameNapirend,
                    new OrarendImportFileUploadCo
                    {
                        OrarendImportTipus = (int)OrarendImportTipusEnum.Import,
                        IsNapirendImport = true,
                        WorksheetName = ImportExportOrarendResource.ImportDefaultSheetNameNapirend,
                        ExcelHeaderList = OrarendImportExportHelper.ImportHeaderListNapirend
                    }));

                results.Add((ImportExportOrarendResource.ExportFileNameNapirendErvenyessegiIdovel,
                    new OrarendImportFileUploadCo
                    {
                        OrarendImportTipus = (int)OrarendImportTipusEnum.ErvenyessegiIdovelImport,
                        IsNapirendImport = true,
                        WorksheetName = ImportExportOrarendResource.ImportDefaultSheetNameNapirendErvenyessegiIdovel,
                        ExcelHeaderList = OrarendImportExportHelper.ImportHeaderListNapirendOraErvenyessegiIdovel
                    }));
            }

            return results;
        }

        private DataSet CreateExportDataSet(List<OrarendekTorleseExportAdatokCo> exportAdatok, DataSet orarendExportAdatokDs, bool isNapirend)
        {
            var filteredExportAdatok = exportAdatok.Where(a => isNapirend ? a.IsNapirend : !a.IsNapirend);

            var exportDs = orarendExportAdatokDs.Copy();
            foreach (DataRow dataRow in exportDs.Tables[0].Rows)
            {
                var orarendiOraId = dataRow.Field<int>("Id");
                var exportAdat = filteredExportAdatok.FirstOrDefault(a => a.Id == orarendiOraId);
                if (exportAdat != null)
                {
                    dataRow.SetField("OraErvenyessegKezdete", exportAdat.ErvenyessegKezdete);
                    dataRow.SetField("OraErvenyessegVege", exportAdat.ErvenyessegVege);
                }
                else
                {
                    dataRow.Delete();
                }
            }

            exportDs.AcceptChanges();
            return exportDs;
        }
    }
}