using Deckungsbeitrag;
using Npgsql;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Management;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace DatenDB
{
  static class DatenbankConnection
  {
		private static NpgsqlConnection connection = null;
    private static readonly int MaxRetries = 3;
    private static readonly int RetryDelayMs = 1000; // 1 Sekunde
		
		public static NpgsqlConnection GetConnection()
		{
      if (connection?.State == System.Data.ConnectionState.Open) return connection;
      connection?.Dispose();

      var cs = ConfigurationManager.AppSettings["ConnectionString"];

      int attempt = 0;
			while (true)
			{
				try
				{
					connection = new NpgsqlConnection(cs);

					return connection;
				}
				catch (NpgsqlException ex)
				{
					attempt++;
					Console.WriteLine($"DB-Connection-Versuch {attempt}");
					if (attempt >= MaxRetries)
					{
						MessageBox.Show(ex.Message + $"\n\nBitte starte das Programm neu.", "FEHLER", MessageBoxButtons.OK, MessageBoxIcon.Error);
						Program.AddFehler(null, ex.Message, ex.StackTrace, null);
						throw; // nach X Versuchen aufgeben
					}

					Thread.Sleep(RetryDelayMs);

				}
			}
		}

	}
}