using Npgsql;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DatenDB
{
	public class Maschine
	{
		public const string COLUMNS = "maschine_id, faecher, bezeichnung, trockner_kaputt";
		private const string TABLE = "kundenverwaltung.maschine";


		public static Maschine GetMaschine(int? mID, string bezeichnung)
		{
			DatenbankConnection.GetConnection().Open();
			Maschine result = null;
			NpgsqlCommand command = new NpgsqlCommand();
			command.Connection = DatenbankConnection.GetConnection();

			if (string.IsNullOrEmpty(bezeichnung)) command.CommandText = $"select {COLUMNS} from {TABLE} where maschine_id = {mID}";
			if (mID == null) command.CommandText = $"select {COLUMNS} from {TABLE} where bezeichnung = '{bezeichnung}'";

			NpgsqlDataReader reader = command.ExecuteReader();
			while (reader.Read()) result = new Maschine(reader);
			reader.Close();
			DatenbankConnection.GetConnection().Close();
			return result;
		}
		public static List<Maschine> GetList()
		{
			DatenbankConnection.GetConnection().Open();
			List<Maschine> resultList = new List<Maschine>();
			NpgsqlCommand command = new NpgsqlCommand();
			command.Connection = DatenbankConnection.GetConnection();
			command.CommandText = $"select {COLUMNS} from {TABLE}";
			NpgsqlDataReader reader = command.ExecuteReader();
			while (reader.Read()) resultList.Add(new Maschine(reader));
			reader.Close();
			DatenbankConnection.GetConnection().Close();
			return resultList;
		}
		public Maschine()
		{
		} // LEER
		public int? MaschineID { get; set; }
		public int Faecher { get; set; }
		public string Bezeichnung { get; set; }
		public bool TrocknerKaputt { get; set; }

		public Maschine(NpgsqlDataReader reader)
		{
			this.MaschineID = reader.GetInt32(0);
			this.Faecher = reader.GetInt32(1);
			this.Bezeichnung = reader.GetString(2);
			this.TrocknerKaputt = reader.IsDBNull(3) ? false : reader.GetBoolean(3);
		}
		public int Save()
		{
			DatenbankConnection.GetConnection().Open();
			NpgsqlCommand command = new NpgsqlCommand();
			command.Connection = DatenbankConnection.GetConnection();

			if(this.MaschineID.HasValue & this.MaschineID != 0)
			{
				command.CommandText = $"update {TABLE} set faecher = :p1, bezeichnung = :p2, trockner_kaputt = :p3 where maschine_id = :p0";
			}
			else
			{
				command.CommandText = "select nextval('kundenverwaltung.maschine_seq')";
				this.MaschineID = (int)(long)command.ExecuteScalar();
				command.CommandText = $"insert into {TABLE} ({COLUMNS}) values (:p0, :p1, :p2, :p3)";
			}
			command.Parameters.AddWithValue("p0", this.MaschineID);
			command.Parameters.AddWithValue("p1", this.Faecher);
			command.Parameters.AddWithValue("p2", this.Bezeichnung);
			command.Parameters.AddWithValue("p3", this.TrocknerKaputt);

			int result = command.ExecuteNonQuery();
			DatenbankConnection.GetConnection().Close();
			return result;
		}
	}
}