using System;
using System.Collections.Generic;
using System.Text;
using System.Data.SqlClient;
using Microsoft.Data.SqlClient;

namespace De.Lambertz.Essentials
{
    public class KernParameterSingelton : ISingelton
    {
        private static KernParameterSingelton me = null;
        static readonly object padlock0 = new object(); //Threadsafe!!
        //
        private String sessionID = null;
        private Encoding encoding = Encoding.Default;
        //
        private Dictionary<String, String> programmVerknüpfungen = null;
        private bool istProgrammVerknüpfungenDirty = true;

        private KernParameterSingelton()
        {

        }

        public static KernParameterSingelton GetInstance()
        {
            lock (padlock0)
            {
                if (me == null)
                {
                    me = new KernParameterSingelton();
                    SingeltonManager.GetInstance().RegisterSingelton(me);
                }
                return me;
            }
        }

        public void ManagedReset(string userName)
        {
            lock (padlock0)
            {
                me = new KernParameterSingelton();
            }
        }

        public void ManagedKill()
        {
            lock (padlock0)
            {
                me = null;
            }
        }

        public String SessionID
        {
            get { return sessionID; }
            set { sessionID = value; }
        }

        public Encoding Encoding
        {
            get { return encoding; }
            set { encoding = value; }
        }

        public void ProgrammVerknüpfungenSindDirty()
        {
            istProgrammVerknüpfungenDirty = true;
        }

        public String ProgrammVerknüpfung(String endungMitPunkt)
        {
            if (istProgrammVerknüpfungenDirty)
            {
                programmVerknüpfungenLaden();
            }

            String result = null;

            if (programmVerknüpfungen.ContainsKey(endungMitPunkt))
            {
                result = programmVerknüpfungen[endungMitPunkt]; 
            }

            return result;
        }

        public Dictionary<String, String> ProgrammVerknüpfungen
        {
            get 
            {
                if (istProgrammVerknüpfungenDirty)
                {
                    programmVerknüpfungenLaden();
                }

                return programmVerknüpfungen; 
            }
        }

        private void programmVerknüpfungenLaden()
        {
            programmVerknüpfungen = new Dictionary<string, string>();
            using (SqlConnection con = new SqlConnection(DBTools.ConnectionStringLAMBERTZ()))
            {
                con.Open();
                String sql = "SELECT [Endung], [ProgrammPfad] FROM [Lambertz].[LA].[PortalReProVer] where [RechnerName] = @p1 order by [Endung]";
                SqlCommand cmd = new SqlCommand(sql, con);
                cmd.Parameters.AddWithValue("@p1", EssentialTools.RechnerName());
                using (SqlDataReader reader = cmd.ExecuteReader())
                {
                    while (reader.Read())
                    {
                        String key = DBTools.DBGetString(reader, 0);
                        if (!programmVerknüpfungen.ContainsKey(key))
                        {
                            programmVerknüpfungen.Add(key, DBTools.DBGetString(reader, 1));
                        }
                    }
                }
            }
            istProgrammVerknüpfungenDirty = false;
        }
    }
}