using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Text;
using BeWo.Data.Access;
using BeWo.Data.Entities;
using BeWo.Service.DCEntityMapper;
using BS.Shared;
using BS.Shared.DataContracts;
using BS.Shared.Extensions;

namespace DiakonischesWerkMuelheimTwg.Export
{
    public class DatevExporter
    {

        public static QueryDC CreateQuery(QueryDC query)
        {
            DateTime dt = DateTime.Now;
            DateTime.TryParse(query.Parameter[0].Value.ToString(), out dt);
            query.FileName = String.Format("Datev Export {0:yyyyMM}.csv", dt);
            query.QueryResult = GetAbrechnungenString(dt);

            return query;
        }

        public static String GetAbrechnungenString(DateTime date)
        {
            StringBuilder sb = new StringBuilder();

            sb.Append("Betrag;S/H;BU;Gegenkonto;Blg 1;Dat;Konto;Kst;Text");

            var s = GetMonatlicheRechnungenString(date);
            if (!String.IsNullOrWhiteSpace(s))
            {
                sb.AppendLine();
                sb.Append(s);
            }

            return sb.ToString();
        }

        public static String GetMonatlicheRechnungenString(DateTime date)
        {
            var sql = GetMonatlicheRechnungenSql(date);
            var dt = ExecuteQuery(sql, date);

            StringBuilder sb = new StringBuilder();
            foreach (DataRow row in dt.Rows)
            {
                if (sb.Length > 0)
                {
                    sb.AppendLine();
                }
                String buchungstext = "";
                long? c2sOid = (long?)row[5];
                if (c2sOid.HasValue)
                {
                    var c2s = DAOFactory.GenericDAO.LoadByID<CostBearer2SupportConcept>(c2sOid.Value);
                    var c = c2s.SupportConcept.Customer;
                    buchungstext = String.Format("{0}, {1} {2:MM}/{2:yy}", c.Person.LastName, c.Person.FirstName, row[8]);
                }

                string konto = String.Format("{0}", row[1]).Trim();        // customer.DebitorNumber
                string kostenstelle = String.Format("{0}", row[4]).Trim(); // customer.CostCenter
                string belegfeld1 = String.Format("{0}", row[3]).Trim();   // ib.invoicenumber
                string gegenkonto = ErmittleErloeskonto((long)row[10]);     // ib.Oid -> 40920 Pflege/Barbetrag, sonst 40910 ABW
                sb.Append(BuildBuchungszeile(row[0], konto, gegenkonto, belegfeld1, row[2], kostenstelle, buchungstext));
            }

            return sb.ToString();
        }

        // Spalten: Betrag;S/H;BU;Gegenkonto;Blg 1;Dat;Konto;Kst;Text
        private static String BuildBuchungszeile(object betrag, string konto, string gegenkonto, string belegfeld1, object belegdatum, string kostenstelle, string buchungstext)
        {
            StringBuilder sb = new StringBuilder();
            sb.Append(String.Format("{0:0.00}", betrag));     // Betrag
            sb.Append(";S");                                  // S/H
            sb.Append(";");                                   // BU (leer)
            sb.Append(";");
            sb.Append(gegenkonto);                            // Gegenkonto
            sb.Append(";");
            sb.Append(belegfeld1);                            // Blg 1
            sb.Append(";");
            sb.Append(String.Format("{0:ddMM}", belegdatum)); // Dat
            sb.Append(";");
            sb.Append(konto);                                 // Konto
            sb.Append(";");
            sb.Append(kostenstelle);                          // Kst (leer)
            sb.Append(";");
            sb.Append(buchungstext);                          // Text
            return sb.ToString();
        }

        // Kunde hat kein festes Erloeskonto: 40920 fuer Pflege/Barbetrag, 40910 fuer ABW.
        // Massgeblich ist die UnitDescription der InvoiceItems; ist diese leer (Rechnung vor Juli 2026), gilt die ItemDescription.
        private static String ErmittleErloeskonto(long invoiceBaseOid)
        {
            var invoice = DAOFactory.SearchDAO.GetServiceInvoiceByInvoiceBaseOid(invoiceBaseOid);
            if (invoice != null && invoice.ServiceInvoicePeriodList != null)
            {
                foreach (var period in invoice.ServiceInvoicePeriodList)
                {
                    if (period.InvoiceItemList == null)
                    {
                        continue;
                    }
                    foreach (var item in period.InvoiceItemList)
                    {
                        string text = !String.IsNullOrWhiteSpace(item.UnitDescription) ? item.UnitDescription : item.ItemDescription;
                        if (EnthaeltPflege(text))
                        {
                            return "40920"; // Pflege
                        }
                    }
                }
            }
            return "40910"; // ABW (Umkehrschluss: kein Pflege/Barbetrag)
        }

        private static bool EnthaeltPflege(string text)
        {
            if (String.IsNullOrEmpty(text))
            {
                return false;
            }
            return text.IndexOf("Pflege", StringComparison.OrdinalIgnoreCase) >= 0;
        }

        private static String GetMonatlicheRechnungenSql(DateTime date)
        {

            String sql = @"
 select
 sip.Claim,
c.DebitorNumber,
 ib.InvoiceDate,
 ib.invoicenumber,
 c.CostCenter,
c2s.Oid,
ib.InvoiceId,
c2s.Notice AS 'Kostenstelle',
ib.`AccountingPeriodEnd`,
ib.`AccountingPeriodStart`,
ib.Oid
 from
 person p
 inner join customer c on c.personoid = p.oid
 inner join supportconcept sc on sc.customeroid = c.oid
 inner join costbearer2supportconcept c2s on c2s.supportconceptoid = sc.oid
 inner join invoicebase ib on ib.costbearer2supportconceptoid = c2s.oid
 inner join serviceinvoice si on si.invoicebaseoid = ib.oid
 inner join serviceinvoiceperiod sip on sip.serviceinvoiceoid = si.oid
WHERE  ib.`AccountingPeriodEnd` >= ':Monat_Start' AND ib.`AccountingPeriodEnd` < ':Monat_End' and ib.IsActive = 1 AND (ib.InvoiceId <> 'Bar' OR ib.InvoiceId IS NULL) AND ib.IsExported = 0
order by ib.invoicenumber
";

            return sql;
        }

        public static DataTable ExecuteQuery(String sql, DateTime dt)
        {
            var newsql = sql;
            newsql = newsql.Replace(":Abrechnungsmonat", String.Format("{0:dd.MM.yyyy}", dt));
            newsql = newsql.Replace(":Belegnr", String.Format("{0:yyMM}", dt));
            newsql = newsql.Replace(":Monat_MM", String.Format("{0:MM}", dt));
            newsql = newsql.Replace(":Monat_Start", String.Format("{0:yyyy-MM}-01", dt));
            dt = dt.AddMonths(1);
            newsql = newsql.Replace(":Monat_End", String.Format("{0:yyyy-MM}-01", dt));

            return DAOFactory.AdoDAO.ExecuteQuery(newsql).Tables[0];
        }
    }
}