using Npgsql;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web.UI.WebControls;

namespace DatenDB
{
  public class WProgramm
  {
    private static string TABLE = "kundenverwaltung.wprogramm";
    private static string COLUMNS = "wprogramm_id, nummer, bezeichnung";
    public WProgramm()
    {
    }
    public static List<WProgramm> GetList()
    {
      DatenbankConnection.GetConnection().Open();
      List<WProgramm> resultList = new List<WProgramm>();
      NpgsqlCommand command = new NpgsqlCommand();
      command.Connection = DatenbankConnection.GetConnection();
      
      command.CommandText = $"select {COLUMNS} from {TABLE} order by nummer";
      NpgsqlDataReader reader = command.ExecuteReader();
      while (reader.Read()) resultList.Add(new WProgramm(reader));
      reader.Close();
      DatenbankConnection.GetConnection().Close();
      return resultList;

    }
    public WProgramm(NpgsqlDataReader reader)
    {
      this.WprogrammID = reader.GetInt16(0);
      this.Nummer = reader.GetInt16(1);
      this.Bezeichnung = reader.IsDBNull(2) ? string.Empty : reader.GetString(2);
    }
   
    public int Save()
    {
      DatenbankConnection.GetConnection().Open();

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

      if (this.WprogrammID.HasValue & this.WprogrammID != 0)
      {
        command.CommandText = $"update {TABLE} set nummer = :p1, bezeichnung = :p2 WHERE wprogramm_id = :p0";
      }
      else
      {
        command.CommandText = "select nextval('kundenverwaltung.wprogramm_seq')";
        this.WprogrammID = (int)(long)command.ExecuteScalar();
        command.CommandText = $"insert into {TABLE} ({COLUMNS}) values (:p0, :p1, :p2)";
      }

      command.Parameters.AddWithValue("p0", this.WprogrammID);
      command.Parameters.AddWithValue("p1", (int)this.Nummer);
      command.Parameters.AddWithValue("p2", string.IsNullOrEmpty(this.Bezeichnung) ? (object)DBNull.Value : this.Bezeichnung);

      int result = command.ExecuteNonQuery();
      DatenbankConnection.GetConnection().Close();
      return result;
    }
    public int? WprogrammID { get; set; }
    public int Nummer { get; set; }
    public string Bezeichnung { get; set; }
  }
}