/*
 * 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 OpenSimulator 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;
using System.Collections.Generic;
using System.Data;
using OpenMetaverse;
using OpenSim.Framework;
using MySql.Data.MySqlClient;

namespace OpenSim.Data.MySQL
{
    public class MySqlRegionData : MySqlFramework, IRegionData
    {
        private string m_Realm;
        private List<string> m_ColumnNames = null;
//        private int m_LastExpire = 0;

        public MySqlRegionData(string connectionString, string realm)
                : base(connectionString)
        {
            m_Realm = realm;

            Migration m = new Migration(m_Connection, GetType().Assembly, "GridStore");
            m.Update();
        }

        public List<RegionData> Get(string regionName, UUID scopeID)
        {
            string command = "select * from `"+m_Realm+"` where regionName like ?regionName";
            if (scopeID != UUID.Zero)
                command += " and ScopeID = ?scopeID";

            MySqlCommand cmd = new MySqlCommand(command);

            cmd.Parameters.AddWithValue("?regionName", regionName);
            cmd.Parameters.AddWithValue("?scopeID", scopeID.ToString());

            return RunCommand(cmd);
        }

        public RegionData Get(int posX, int posY, UUID scopeID)
        {
            string command = "select * from `"+m_Realm+"` where locX = ?posX and locY = ?posY";
            if (scopeID != UUID.Zero)
                command += " and ScopeID = ?scopeID";

            MySqlCommand cmd = new MySqlCommand(command);

            cmd.Parameters.AddWithValue("?posX", posX.ToString());
            cmd.Parameters.AddWithValue("?posY", posY.ToString());
            cmd.Parameters.AddWithValue("?scopeID", scopeID.ToString());

            List<RegionData> ret = RunCommand(cmd);
            if (ret.Count == 0)
                return null;

            return ret[0];
        }

        public RegionData Get(UUID regionID, UUID scopeID)
        {
            string command = "select * from `"+m_Realm+"` where uuid = ?regionID";
            if (scopeID != UUID.Zero)
                command += " and ScopeID = ?scopeID";

            MySqlCommand cmd = new MySqlCommand(command);

            cmd.Parameters.AddWithValue("?regionID", regionID.ToString());
            cmd.Parameters.AddWithValue("?scopeID", scopeID.ToString());

            List<RegionData> ret = RunCommand(cmd);
            if (ret.Count == 0)
                return null;

            return ret[0];
        }

        public List<RegionData> Get(int startX, int startY, int endX, int endY, UUID scopeID)
        {
            string command = "select * from `"+m_Realm+"` where locX between ?startX and ?endX and locY between ?startY and ?endY";
            if (scopeID != UUID.Zero)
                command += " and ScopeID = ?scopeID";

            MySqlCommand cmd = new MySqlCommand(command);

            cmd.Parameters.AddWithValue("?startX", startX.ToString());
            cmd.Parameters.AddWithValue("?startY", startY.ToString());
            cmd.Parameters.AddWithValue("?endX", endX.ToString());
            cmd.Parameters.AddWithValue("?endY", endY.ToString());
            cmd.Parameters.AddWithValue("?scopeID", scopeID.ToString());

            return RunCommand(cmd);
        }

        public List<RegionData> RunCommand(MySqlCommand cmd)
        {
            List<RegionData> retList = new List<RegionData>();

            IDataReader result = ExecuteReader(cmd);

            while (result.Read())
            {
                RegionData ret = new RegionData();
                ret.Data = new Dictionary<string, object>();

                UUID regionID;
                UUID.TryParse(result["uuid"].ToString(), out regionID);
                ret.RegionID = regionID;
                UUID scope;
                UUID.TryParse(result["ScopeID"].ToString(), out scope);
                ret.ScopeID = scope;
                ret.RegionName = result["regionName"].ToString();
                ret.posX = Convert.ToInt32(result["locX"]);
                ret.posY = Convert.ToInt32(result["locY"]);
                ret.sizeX = Convert.ToInt32(result["sizeX"]);
                ret.sizeY = Convert.ToInt32(result["sizeY"]);

                if (m_ColumnNames == null)
                {
                    m_ColumnNames = new List<string>();

                        DataTable schemaTable = result.GetSchemaTable();
                        foreach (DataRow row in schemaTable.Rows)
                        {
                            if (row["ColumnName"] != null)
                                m_ColumnNames.Add(row["ColumnName"].ToString());
                        }
                    }

                foreach (string s in m_ColumnNames)
                {
                    if (s == "uuid")
                        continue;
                    if (s == "ScopeID")
                        continue;
                    if (s == "regionName")
                        continue;
                    if (s == "locX")
                        continue;
                    if (s == "locY")
                        continue;

                    ret.Data[s] = result[s].ToString();
                }

                retList.Add(ret);
            }

            result.Close();
            CloseReaderCommand(cmd);

            return retList;
        }

        public bool Store(RegionData data)
        {
            if (data.Data.ContainsKey("uuid"))
                data.Data.Remove("uuid");
            if (data.Data.ContainsKey("ScopeID"))
                data.Data.Remove("ScopeID");
            if (data.Data.ContainsKey("regionName"))
                data.Data.Remove("regionName");
            if (data.Data.ContainsKey("posX"))
                data.Data.Remove("posX");
            if (data.Data.ContainsKey("posY"))
                data.Data.Remove("posY");
            if (data.Data.ContainsKey("sizeX"))
                data.Data.Remove("sizeX");
            if (data.Data.ContainsKey("sizeY"))
                data.Data.Remove("sizeY");
            if (data.Data.ContainsKey("locX"))
                data.Data.Remove("locX");
            if (data.Data.ContainsKey("locY"))
                data.Data.Remove("locY");

            string[] fields = new List<string>(data.Data.Keys).ToArray();

            MySqlCommand cmd = new MySqlCommand();

            string update = "update `"+m_Realm+"` set locX=?posX, locY=?posY, sizeX=?sizeX, sizeY=?sizeY";
            foreach (string field in fields)
            {
                update += ", ";
                update += "`" + field + "` = ?"+field;

                cmd.Parameters.AddWithValue("?"+field, data.Data[field]);
            }

            update += " where uuid = ?regionID";

            if (data.ScopeID != UUID.Zero)
                update += " and ScopeID = ?scopeID";

            cmd.CommandText = update;
            cmd.Parameters.AddWithValue("?regionID", data.RegionID.ToString());
            cmd.Parameters.AddWithValue("?regionName", data.RegionName);
            cmd.Parameters.AddWithValue("?scopeID", data.ScopeID.ToString());
            cmd.Parameters.AddWithValue("?posX", data.posX.ToString());
            cmd.Parameters.AddWithValue("?posY", data.posY.ToString());
            cmd.Parameters.AddWithValue("?sizeX", data.sizeX.ToString());
            cmd.Parameters.AddWithValue("?sizeY", data.sizeY.ToString());

            if (ExecuteNonQuery(cmd) < 1)
            {
                string insert = "insert into `" + m_Realm + "` (`uuid`, `ScopeID`, `locX`, `locY`, `sizeX`, `sizeY`, `regionName`, `" +
                        String.Join("`, `", fields) +
                        "`) values ( ?regionID, ?scopeID, ?posX, ?posY, ?sizeX, ?sizeY, ?regionName, ?" + String.Join(", ?", fields) + ")";

                cmd.CommandText = insert;

                if (ExecuteNonQuery(cmd) < 1)
                {
                    cmd.Dispose();
                    return false;
                }
            }

            cmd.Dispose();

            return true;
        }

        public bool SetDataItem(UUID regionID, string item, string value)
        {
            MySqlCommand cmd = new MySqlCommand("update `" + m_Realm +
                    "` set `" + item + "` = ?" + item + " where uuid = ?UUID");


            cmd.Parameters.AddWithValue("?"+item, value);
            cmd.Parameters.AddWithValue("?UUID", regionID.ToString());

            if (ExecuteNonQuery(cmd) > 0)
                return true;

            return false;
        }

        public bool Delete(UUID regionID)
        {
            MySqlCommand cmd = new MySqlCommand("delete from `" + m_Realm +
                    "` where uuid = ?UUID");


            cmd.Parameters.AddWithValue("?UUID", regionID.ToString());

            if (ExecuteNonQuery(cmd) > 0)
                return true;

            return false;
        }
    }
}