/*
 * Copyright (c) Contributors, http://opensimulator.org/
 * See CONTRIBUTORS.TXT for a full list of copyright holders.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the OpenSim Project nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Reflection;
using System.Threading;
using libsecondlife;
using log4net;
using MySql.Data.MySqlClient;
using OpenSim.Framework;
using OpenSim.Region.Environment.Interfaces;
using OpenSim.Region.Environment.Scenes;

namespace OpenSim.Data.MySQL
{
    public class MySQLEstateStore : IEstateDataStore
    {
        private static readonly ILog m_log =
            LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        private const string m_waitTimeoutSelect = "select @@wait_timeout";

        private MySqlConnection m_connection;
        private string m_connectionString;
        private long m_waitTimeout;
        private long m_waitTimeoutLeeway = 60 * TimeSpan.TicksPerSecond;
        private long m_lastConnectionUse;        

        private FieldInfo[] m_Fields;
        private Dictionary<string, FieldInfo> m_FieldMap =
                new Dictionary<string, FieldInfo>();

        public void Initialise(string connectionString)
        {
            m_connectionString = connectionString;
            
            m_log.Info("[ESTATE DB]: MySql - connecting: "+m_connectionString);

            m_connection = new MySqlConnection(m_connectionString);
            m_connection.Open();
            
            GetWaitTimeout();             

            Assembly assem = GetType().Assembly;
            Migration m = new Migration(m_connection, assem, "EstateStore");
            m.Update();

            Type t = typeof(EstateSettings);
            m_Fields = t.GetFields(BindingFlags.NonPublic |
                                   BindingFlags.Instance |
                                   BindingFlags.DeclaredOnly);

            foreach (FieldInfo f in m_Fields)
                if(f.Name.Substring(0, 2) == "m_")
                    m_FieldMap[f.Name.Substring(2)] = f;
        }
        
        private string[] FieldList
        {
            get { return new List<string>(m_FieldMap.Keys).ToArray(); }
        }

        protected void GetWaitTimeout()
        {
            MySqlCommand cmd = new MySqlCommand(m_waitTimeoutSelect,
                    m_connection);
            
            using (MySqlDataReader dbReader =
                    cmd.ExecuteReader(CommandBehavior.SingleRow))
            {
                if (dbReader.Read())
                {
                    m_waitTimeout 
                        = Convert.ToInt32(dbReader["@@wait_timeout"]) *
                        TimeSpan.TicksPerSecond + m_waitTimeoutLeeway;
                }       
                
                dbReader.Close();
                cmd.Dispose();
            }   
            
            m_lastConnectionUse = System.DateTime.Now.Ticks;
            
            m_log.DebugFormat(
                "[REGION DB]: Connection wait timeout {0} seconds",
                m_waitTimeout / TimeSpan.TicksPerSecond);            
        }
                
        protected void CheckConnection()
        {
            long timeNow = System.DateTime.Now.Ticks;
            if (timeNow - m_lastConnectionUse > m_waitTimeout ||
                    m_connection.State != ConnectionState.Open)
            {
                m_log.DebugFormat("[REGION DB]: Database connection has gone away - reconnecting");
                
                lock (m_connection)
                {
                    m_connection.Close();
                    m_connection = new MySqlConnection(m_connectionString);
                    m_connection.Open();                    
                }
            }
            
            m_lastConnectionUse = timeNow;            
        }        

        public EstateSettings LoadEstateSettings(LLUUID regionID)
        {
            EstateSettings es = new EstateSettings();

            string sql = "select estate_settings."+String.Join(",estate_settings.", FieldList)+" from estate_map left join estate_settings on estate_map.EstateID = estate_settings.EstateID where estate_settings.EstateID is not null and RegionID = ?RegionID";

            CheckConnection();

            MySqlCommand cmd = m_connection.CreateCommand();

            cmd.CommandText = sql;
            cmd.Parameters.Add("?RegionID", regionID.ToString());

            IDataReader r = cmd.ExecuteReader();

            if(r.Read())
            {
                foreach (string name in FieldList)
                {
                    if(m_FieldMap[name].GetValue(es) is bool)
                    {
                        int v = Convert.ToInt32(r[name]);
                        if(v != 0)
                            m_FieldMap[name].SetValue(es, true);
                        else
                            m_FieldMap[name].SetValue(es, false);
                    }
                    else
                    {
                        m_FieldMap[name].SetValue(es, r[name]);
                    }
                }
                r.Close();
            }
            else
            {
                // Migration case
                //
                r.Close();

                List<string> names = new List<string>(FieldList);

                names.Remove("EstateID");

                sql = "insert into estate_settings ("+String.Join(",", names.ToArray())+") values ( ?"+String.Join(", ?", names.ToArray())+")";
                
                cmd.CommandText = sql;
                cmd.Parameters.Clear();

                foreach (string name in FieldList)
                {
                    if(m_FieldMap[name].GetValue(es) is bool)
                    {
                        if((bool)m_FieldMap[name].GetValue(es))
                            cmd.Parameters.Add("?"+name, "1");
                        else
                            cmd.Parameters.Add("?"+name, "0");
                    }
                    else
                    {
                        cmd.Parameters.Add("?"+name, m_FieldMap[name].GetValue(es).ToString());
                    }
                }

                cmd.ExecuteNonQuery();

                cmd.CommandText = "select LAST_INSERT_ID() as id";
                cmd.Parameters.Clear();

                r = cmd.ExecuteReader();

                r.Read();

                es.EstateID = Convert.ToUInt32(r["id"]);

                r.Close();

                cmd.CommandText = "insert into estate_map values (?RegionID, ?EstateID)";
                cmd.Parameters.Add("?RegionID", regionID.ToString());
                cmd.Parameters.Add("?EstateID", es.EstateID.ToString());

                // This will throw on dupe key
                try
                {
                    cmd.ExecuteNonQuery();
                }
                catch (Exception)
                {
                }

                // Munge and transfer the ban list
                //
                cmd.Parameters.Clear();
                cmd.CommandText = "insert into estateban select "+es.EstateID.ToString()+", bannedUUID, bannedIp, bannedIpHostMask, '' from regionban where regionban.regionUUID = ?UUID";
                cmd.Parameters.Add("?UUID", regionID.ToString());

                try
                {
                    cmd.ExecuteNonQuery();
                }
                catch (Exception)
                {
                }
            }

            LoadBanList(es);

            es.EstateManagers = LoadUUIDList(es.EstateID, "estate_managers");
            es.EstateAccess = LoadUUIDList(es.EstateID, "estate_users");
            es.EstateGroups = LoadUUIDList(es.EstateID, "estate_groups");
            return es;
        }

        public void StoreEstateSettings(EstateSettings es)
        {
            string sql = "replace into estate_settings ("+String.Join(",", FieldList)+") values ( ?"+String.Join(", ?", FieldList)+")";

            CheckConnection();

            MySqlCommand cmd = m_connection.CreateCommand();

            cmd.CommandText = sql;

            foreach (string name in FieldList)
            {
                if(m_FieldMap[name].GetValue(es) is bool)
                {
                    if((bool)m_FieldMap[name].GetValue(es))
                        cmd.Parameters.Add("?"+name, "1");
                    else
                        cmd.Parameters.Add("?"+name, "0");
                }
                else
                {
                    cmd.Parameters.Add("?"+name, m_FieldMap[name].GetValue(es).ToString());
                }
            }

            cmd.ExecuteNonQuery();

            SaveBanList(es);
            SaveUUIDList(es.EstateID, "estate_managers", es.EstateManagers);
            SaveUUIDList(es.EstateID, "estate_users", es.EstateAccess);
            SaveUUIDList(es.EstateID, "estate_groups", es.EstateGroups);
        }

        private void LoadBanList(EstateSettings es)
        {
            es.ClearBans();

            CheckConnection();
            
            MySqlCommand cmd = m_connection.CreateCommand();

            cmd.CommandText = "select bannedUUID from estateban where EstateID = ?EstateID";
            cmd.Parameters.Add("?EstateID", es.EstateID);

            IDataReader r = cmd.ExecuteReader();

            while(r.Read())
            {
                EstateBan eb = new EstateBan();

                LLUUID uuid = new LLUUID();
                LLUUID.TryParse(r["bannedUUID"].ToString(), out uuid);

                eb.bannedUUID = uuid;
                eb.bannedIP = "0.0.0.0";
                eb.bannedIPHostMask = "0.0.0.0";
                es.AddBan(eb);
            }
            r.Close();
        }

        private void SaveBanList(EstateSettings es)
        {
            CheckConnection();
            
            MySqlCommand cmd = m_connection.CreateCommand();
            
            cmd.CommandText = "delete from estateban where EstateID = ?EstateID";
            cmd.Parameters.Add("?EstateID", es.EstateID.ToString());

            cmd.ExecuteNonQuery();
            
            cmd.Parameters.Clear();

            cmd.CommandText = "insert into estateban (EstateID, bannedUUID) values ( ?EstateID, ?bannedUUID )";
            
            foreach(EstateBan b in es.EstateBans)
            {
                cmd.Parameters.Add("?EstateID", es.EstateID.ToString());
                cmd.Parameters.Add("?bannedUUID", b.bannedUUID.ToString());

                cmd.ExecuteNonQuery();
                cmd.Parameters.Clear();
            }
        }

        void SaveUUIDList(uint EstateID, string table, LLUUID[] data)
        {
            CheckConnection();
            
            MySqlCommand cmd = m_connection.CreateCommand();
            
            cmd.CommandText = "delete from "+table+" where EstateID = ?EstateID";
            cmd.Parameters.Add("?EstateID", EstateID.ToString());

            cmd.ExecuteNonQuery();
            
            cmd.Parameters.Clear();

            cmd.CommandText = "insert into "+table+" (EstateID, uuid) values ( ?EstateID, ?uuid )";
            
            foreach(LLUUID uuid in data)
            {
                cmd.Parameters.Add("?EstateID", EstateID.ToString());
                cmd.Parameters.Add("?uuid", uuid.ToString());

                cmd.ExecuteNonQuery();
                cmd.Parameters.Clear();
            }
        }

        LLUUID[] LoadUUIDList(uint EstateID, string table)
        {
            List<LLUUID> uuids = new List<LLUUID>();

            CheckConnection();
            
            MySqlCommand cmd = m_connection.CreateCommand();

            cmd.CommandText = "select uuid from "+table+" where EstateID = ?EstateID";
            cmd.Parameters.Add("?EstateID", EstateID);

            IDataReader r = cmd.ExecuteReader();

            while(r.Read())
            {
                EstateBan eb = new EstateBan();

                LLUUID uuid = new LLUUID();
                LLUUID.TryParse(r["uuid"].ToString(), out uuid);

                uuids.Add(uuid);
            }
            r.Close();
            
            return uuids.ToArray();
        }
    }
}