using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using bsmd.AISService.AIS;

namespace bsmd.AISService.DB
{
    internal class Hotposition
    {
        private int id;
        private int mmsi;
        private int pid;

        public int MMSI
        {
            get { return this.mmsi; }
        }

        public int PosReportId
        {
            get { return this.pid; }
            set { this.pid = value; }
        }

        public void Save(DBConnector con)
        {
            string query = string.Format("UPDATE hotposition SET mmsi={0}, pid={1} WHERE id={2}",
                this.mmsi, this.pid, this.id);
            con.ExecuteNonQuery(query);
        }

        public static Hotposition LoadForMMSI(int mmsi, DBConnector con)
        {
            List<Hotposition> results = new List<Hotposition>();
            string query = string.Format("SELECT id, pid FROM hotposition WHERE mmsi={0}", mmsi);            
            SqlDataReader reader = con.ExecuteQuery(query);
            if (reader != null)
            {
                while (reader.Read())
                {
                    Hotposition hp = new Hotposition();
                    hp.id = reader.GetInt32(0);
                    hp.mmsi = mmsi;
                    if (!reader.IsDBNull(1))
                        hp.pid = reader.GetInt32(1);
                    results.Add(hp);
                }
                reader.Close();
            }

            if (results.Count == 0)
            {
                // neuen Eintrag erzeugen
                Hotposition hp = new Hotposition();
                string insertQuery = string.Format("INSERT INTO hotposition SET mmsi={0}", mmsi);                
                con.ExecuteNonQuery(insertQuery);
                
                object ob = con.ExecuteScalar("SELECT LAST_INSERT_ID()");
                hp.id = Convert.ToInt32(ob);
                hp.mmsi = mmsi;
                return hp;
            }
            else if (results.Count == 1)
            {
                return results[0];
            }
            else
            {
                // überschüssige HP's löschen (jeweils nur eins pro MMSI)
                for (int i = 1; i < results.Count; i++)
                {
                    string delQuery = string.Format("DELETE FROM hotposition WHERE id={0}", results[i].id);
                    con.ExecuteNonQuery(delQuery);
                }

                return results[0];
            }
        }

    }
}