using Npgsql;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web.UI.WebControls;
using static System.Net.Mime.MediaTypeNames;

namespace DatenDB
{
	public class Umsatz
	{
		private const string COLUMNS = "umsatz_id, kunde_id, datum, betrag";
		public const string SUBCOLUMNS = "kunde_id, date_part('year', datum) as jahr, sum(betrag) as betrag";
		private const string TABLE = "kundenverwaltung.umsatz";
		
		public Umsatz()
		{
		}
		public int GetUmsatzID(int? kundeid, DateTime datum)
		{
			DatenbankConnection.GetConnection().Open();
			NpgsqlCommand command = new NpgsqlCommand();
			command.Connection = DatenbankConnection.GetConnection();
			command.CommandText = $"select umsatz_id from {TABLE} where kunde_id = '{kundeid}' and datum = '{datum}'";

			int result = 0;
			NpgsqlDataReader reader = command.ExecuteReader();
			while (reader.Read()) result = reader.GetInt32(0);
			reader.Close();
			DatenbankConnection.GetConnection().Close();

			return result;
		}//IMPORT DATUM KEINE VERWENDUNG ODER
		public static double GetUmsatz(int? id, int? year, int? month, int[] quartale)
		{
			DatenbankConnection.GetConnection().Open();
			double umsatz = 0;
			NpgsqlCommand command = new NpgsqlCommand();
			command.Connection = DatenbankConnection.GetConnection();

			if (quartale == null || quartale.Length == 0)
			{
				if (id == null)
				{
					if (month <= 12) command.CommandText = $"select sum(betrag) from {TABLE} where date_part('year', datum) = {year} and date_part('month', datum) = {month}";
					if (month == null || month == 0) command.CommandText = $"select sum(betrag) from {TABLE} where date_part('year', datum) = {year}";
        }
				else
				{
					command.CommandText = $"select sum(betrag) from {TABLE} where kunde_id = {id} and date_part('year', datum) = {year}";
				}
			}
			else
			{

				if (id == null)
				{
					if (quartale.Length == 1) command.CommandText = $"select sum(betrag) from {TABLE} where date_part('year', datum) = {year} and date_part('quarter', datum) = {quartale[0]}";
					if (quartale.Length == 2) command.CommandText = $"select sum(betrag) from {TABLE} where date_part('year', datum) = {year} and date_part('quarter', datum) between '{quartale[1]}' and '{quartale[0]}'";
					if (quartale.Length == 3) command.CommandText = $"select sum(betrag) from {TABLE} where date_part('year', datum) = {year} and date_part('quarter', datum) between '{quartale[2]}' and '{quartale[0]}'";
					if (quartale.Length == 4) command.CommandText = $"select sum(betrag) from {TABLE} where date_part('year', datum) = {year} and date_part('quarter', datum) between '{quartale[3]}' and '{quartale[0]}'";
				}
				else
				{
					command.CommandText = $"select sum(betrag) from {TABLE} where ";
					//if (quartale.Length == 1) command.CommandText = $"select sum(betrag) from {TABLE} where kunde_id = {id} date_part('year', datum) = {year} and date_part('quarter', datum) = {quartale[0]}";
					//if (quartale.Length == 2) command.CommandText = $"select sum(betrag) from {TABLE} where kunde_id = {id} date_part('year', datum) = {year} and date_part('quarter', datum) between '{quartale[1]}' and '{quartale[0]}'";
					//if (quartale.Length == 3) command.CommandText = $"select sum(betrag) from {TABLE} where kunde_id = {id} and date_part('year', datum) = {year} and date_part('quarter', datum) between '{quartale[2]}' and '{quartale[0]}'";
					//if (quartale.Length == 4) command.CommandText = $"select sum(betrag) from {TABLE} where kunde_id = {id} and date_part('year', datum) = {year} and date_part('quarter', datum) between '{quartale[3]}' and '{quartale[0]}'";
				}

			}
			
			NpgsqlDataReader reader = command.ExecuteReader();
			
			while (reader.Read()) umsatz = reader.IsDBNull(0) ? 0 : reader.GetDouble(0);
			reader.Close();
			
			DatenbankConnection.GetConnection().Close();
			return umsatz;
		}
    public Umsatz(NpgsqlDataReader reader, bool columns)
		{
			if (columns)
			{
				this.UmsatzID = reader.GetInt32(0);
				this.KundeID = reader.GetInt32(1);
				this.Datum = reader.GetDateTime(2);
				this.Betrag = reader.IsDBNull(3) ? 0 : reader.GetDouble(3);
			}
			else
			{
				this.KundeID = reader.GetInt32(0);
				this.Year = (int)reader.GetDouble(1);
				this.Betrag = reader.IsDBNull(2) ? 0 : reader.GetDouble(2);
			}
		}
		public int Save()
		{
			DatenbankConnection.GetConnection().Open();

			NpgsqlCommand command = new NpgsqlCommand();
			command.Connection = DatenbankConnection.GetConnection();

			if (this.UmsatzID.HasValue & this.UmsatzID != 0)
			{
				command.CommandText = $"update {TABLE} set kunde_id = :p1, datum = :p2, betrag = :p3 WHERE umsatz_id = :p0";
			}
			else
			{
				command.CommandText = "select nextval('kundenverwaltung.umsatz_seq')";
				this.UmsatzID = (int)(long)command.ExecuteScalar();
				command.CommandText = $"insert into {TABLE} ({COLUMNS}) values (:p0, :p1, :p2, :p3)";
			}

			command.Parameters.AddWithValue("p0", this.UmsatzID);
			command.Parameters.AddWithValue("p1", this.KundeID);
			command.Parameters.AddWithValue("p2", this.Datum);
			command.Parameters.AddWithValue("p3", this.Betrag);
			

			int result = command.ExecuteNonQuery();
			DatenbankConnection.GetConnection().Close();
			return result;
		}
    public static List<string> GetJahre()
    {
      DatenbankConnection.GetConnection().Open();
      List<string> resultList = new List<string>();
      NpgsqlCommand command = new NpgsqlCommand();
      command.Connection = DatenbankConnection.GetConnection();
      command.CommandText = $"select distinct date_part('year', datum) from {TABLE} where date_part('year', datum) is not null order by date_part('year', datum);";

      NpgsqlDataReader reader = command.ExecuteReader();
      while (reader.Read()) resultList.Add(reader.GetDouble(0).ToString());
      reader.Close();
      DatenbankConnection.GetConnection().Close();
      return resultList;
    }
		//public static double GetQUmsatz(int? kndid, int? aktjahr, int? monat, int? aktquartal, bool v, int vpjahr)
		//{
  //    DatenbankConnection.GetConnection().Open();
  //    double umsatz = 0;
  //    NpgsqlCommand command = new NpgsqlCommand();
  //    command.Connection = DatenbankConnection.GetConnection();
		//	if (aktquartal == null || aktquartal == 0)
		//	{
		//		//command.CommandText = $"select sum(umsatz) as umsatz from kundenverwaltung.q_umsatz where kunde_id = {kndid} and jahr = {vpjahr}";
		//	}
		//	else
		//	{
		//		if (aktquartal == 4) command.CommandText = $"select umsatz from kundenverwaltung.jahresumsaetze where kunde_id = {kndid} and jahr = {vpjahr}";
  //      else command.CommandText = $"select umsatz from kundenverwaltung.q_umsatz where kunde_id = {kndid} and quartal = {aktquartal} and jahr = {vpjahr}";
		//	}

		//	NpgsqlDataReader reader = command.ExecuteReader();

  //    while (reader.Read()) umsatz = reader.IsDBNull(0) ? 0 : reader.GetDouble(0);
  //    reader.Close();

  //    DatenbankConnection.GetConnection().Close();
  //    return umsatz;
  //  }
		public static List<Umsatz> GetList(int? aktjahr, int? monat, int? aktquartal, bool v, int vpjahr, int[] quartale)
		{
      DatenbankConnection.GetConnection().Open();
      List<Umsatz> resultList = new List<Umsatz>();
      NpgsqlCommand command = new NpgsqlCommand();
      command.Connection = DatenbankConnection.GetConnection();
			if(monat == null || monat == 0)
			{
				if(aktquartal == null || aktquartal == 0)
				{
          if (quartale == null || quartale.Length == 0)
          {
            command.CommandText = $"select {SUBCOLUMNS} from {TABLE} where date_part('year', datum) = {vpjahr} group by umsatz.kunde_id, date_part('year', datum)";
          }
          else
          {
            command.CommandText = $"select {SUBCOLUMNS} from {TABLE} where date_part('year', datum) = {vpjahr} and date_part('quarter', datum) between {quartale.Min()} and {quartale.Max()} group by umsatz.kunde_id, jahr";
          }
        }
				else
				{
          if (aktquartal == 4) command.CommandText = $"select {SUBCOLUMNS} from {TABLE} where date_part('year', datum) = {vpjahr} group by umsatz.kunde_id, date_part('year', datum)";
          else command.CommandText = $"select {SUBCOLUMNS} from {TABLE} where date_part('quarter', datum) = {aktquartal} and date_part('year', datum) = {vpjahr} group by umsatz.kunde_id, date_part('year', datum), date_part('quarter', datum)";
        }

      }
			else command.CommandText = $"select {SUBCOLUMNS} from {TABLE} where date_part('month', datum) = {monat} and date_part('year', datum) = {vpjahr} group by umsatz.kunde_id, date_part('year', datum), date_part('month', datum)";
      NpgsqlDataReader reader = command.ExecuteReader();
      while (reader.Read()) resultList.Add(new Umsatz(reader, false));
      reader.Close();
      DatenbankConnection.GetConnection().Close();
      return resultList;
    }

		public int? UmsatzID { get; set; }
		public int? KundeID { get; set; }
		public DateTime Datum { get; set; }
		public double Betrag { get; set; }
		public int Year { get; set; }
	}
}