/*
 * 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
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 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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 * 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.Security.Cryptography;
using System.Text;
using libsecondlife;
using OpenSim.Framework.Console;

namespace OpenSim.Framework.Data.MSSQL
{
    /// <summary>
    /// A grid data interface for Microsoft SQL Server
    /// </summary>
    public class MSSQLGridData : GridDataBase
    {
        private static readonly log4net.ILog m_log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        /// <summary>
        /// Database manager
        /// </summary>
        private MSSQLManager database;

        private string m_regionsTableName;

        /// <summary>
        /// Initialises the Grid Interface
        /// </summary>
        override public void Initialise()
        {
            IniFile iniFile = new IniFile("mssql_connection.ini");

            string settingDataSource = iniFile.ParseFileReadValue("data_source");
            string settingInitialCatalog = iniFile.ParseFileReadValue("initial_catalog");
            string settingPersistSecurityInfo = iniFile.ParseFileReadValue("persist_security_info");
            string settingUserId = iniFile.ParseFileReadValue("user_id");
            string settingPassword = iniFile.ParseFileReadValue("password");

            m_regionsTableName = iniFile.ParseFileReadValue("regionstablename");
            if (m_regionsTableName == null)
            {
                m_regionsTableName = "regions";
            }

            database =
                new MSSQLManager(settingDataSource, settingInitialCatalog, settingPersistSecurityInfo, settingUserId,
                                 settingPassword);

            TestTables();
        }

        private void TestTables()
        {
            IDbCommand cmd = database.Query("SELECT TOP 1 * FROM "+m_regionsTableName, new Dictionary<string, string>());
 
            try
            {
                cmd.ExecuteNonQuery();
                cmd.Dispose();
            }
            catch (Exception)
            {
                m_log.Info("[DATASTORE]: MSSQL Database doesn't exist... creating");
                database.ExecuteResourceSql("Mssql-regions.sql");            
            }
        }

        /// <summary>
        /// Shuts down the grid interface
        /// </summary>
        override public void Close()
        {
            database.Close();
        }

        /// <summary>
        /// Returns the storage system name
        /// </summary>
        /// <returns>A string containing the storage system name</returns>
        override public string getName()
        {
            return "Sql OpenGridData";
        }

        /// <summary>
        /// Returns the storage system version
        /// </summary>
        /// <returns>A string containing the storage system version</returns>
        override public string getVersion()
        {
            return "0.1";
        }

        /// <summary>
        /// Returns a list of regions within the specified ranges
        /// </summary>
        /// <param name="a">minimum X coordinate</param>
        /// <param name="b">minimum Y coordinate</param>
        /// <param name="c">maximum X coordinate</param>
        /// <param name="d">maximum Y coordinate</param>
        /// <returns>An array of region profiles</returns>
        override public RegionProfileData[] GetProfilesInRange(uint a, uint b, uint c, uint d)
        {
            return null;
        }

        /// <summary>
        /// Returns a sim profile from its location
        /// </summary>
        /// <param name="handle">Region location handle</param>
        /// <returns>Sim profile</returns>
        override public RegionProfileData GetProfileByHandle(ulong handle)
        {
            IDataReader reader = null;
            try
            {
                Dictionary<string, string> param = new Dictionary<string, string>();
                param["handle"] = handle.ToString();
                IDbCommand result = database.Query("SELECT * FROM " + m_regionsTableName + " WHERE regionHandle = @handle", param);
                reader = result.ExecuteReader();

                RegionProfileData row = database.getRegionRow(reader);
                reader.Close();
                result.Dispose();

                return row;
            }
            catch (Exception)
            {
                if (reader != null)
                {
                    reader.Close();
                }
            }
            return null;
        }
       
        /// <summary>
        /// Returns a sim profile from its UUID
        /// </summary>
        /// <param name="uuid">The region UUID</param>
        /// <returns>The sim profile</returns>
        override public RegionProfileData GetProfileByLLUUID(LLUUID uuid)
        {
            Dictionary<string, string> param = new Dictionary<string, string>();
            param["uuid"] = uuid.ToString();
            IDbCommand result = database.Query("SELECT * FROM " + m_regionsTableName + " WHERE uuid = @uuid", param);
            IDataReader reader = result.ExecuteReader();

            RegionProfileData row = database.getRegionRow(reader);
            reader.Close();
            result.Dispose();

            return row;
        }

        /// <summary>
        /// Returns a sim profile from it's Region name string
        /// </summary>
        /// <param name="uuid">The region name search query</param>
        /// <returns>The sim profile</returns>
        override public RegionProfileData GetProfileByString(string regionName)
        {
            if (regionName.Length > 2)
            {
                try
                {
                    lock (database)
                    {
                        Dictionary<string, string> param = new Dictionary<string, string>();
                        // Add % because this is a like query.
                        param["?regionName"] = regionName + "%";
                        // Order by statement will return shorter matches first.  Only returns one record or no record.
                        IDbCommand result = database.Query("SELECT top 1 * FROM " + m_regionsTableName + " WHERE regionName like ?regionName order by regionName", param);
                        IDataReader reader = result.ExecuteReader();

                        RegionProfileData row = database.getRegionRow(reader);
                        reader.Close();
                        result.Dispose();

                        return row;
                    }
                }
                catch (Exception e)
                {
                    database.Reconnect();
                    m_log.Error(e.ToString());
                    return null;
                }
            }
            else
            {
                m_log.Error("[DATABASE]: Searched for a Region Name shorter then 3 characters");
                return null;
            }
        }

        /// <summary>
        /// Adds a new specified region to the database
        /// </summary>
        /// <param name="profile">The profile to add</param>
        /// <returns>A dataresponse enum indicating success</returns>
        override public DataResponse AddProfile(RegionProfileData profile)
        {
            try
            {
                if (GetProfileByLLUUID(profile.UUID) != null)
                {
                    return DataResponse.RESPONSE_OK;
                }
            }
            catch (Exception)
            {
                System.Console.WriteLine("No regions found. Create new one.");
            }

            if (insertRegionRow(profile))
            {
                return DataResponse.RESPONSE_OK;
            }
            else
            {
                return DataResponse.RESPONSE_ERROR;
            }
        }

        /// <summary>
        /// Creates a new region in the database
        /// </summary>
        /// <param name="profile">The region profile to insert</param>
        /// <returns>Successful?</returns>
        public bool insertRegionRow(RegionProfileData profile)
        {
            //Insert new region
            string sql =
                "INSERT INTO " + m_regionsTableName + " ([regionHandle], [regionName], [uuid], [regionRecvKey], [regionSecret], [regionSendKey], [regionDataURI], ";
            sql +=
                "[serverIP], [serverPort], [serverURI], [locX], [locY], [locZ], [eastOverrideHandle], [westOverrideHandle], [southOverrideHandle], [northOverrideHandle], [regionAssetURI], [regionAssetRecvKey], ";
            sql +=
                "[regionAssetSendKey], [regionUserURI], [regionUserRecvKey], [regionUserSendKey], [regionMapTexture], [serverHttpPort], [serverRemotingPort], [owner_uuid]) VALUES ";

            sql += "(@regionHandle, @regionName, @uuid, @regionRecvKey, @regionSecret, @regionSendKey, @regionDataURI, ";
            sql +=
                "@serverIP, @serverPort, @serverURI, @locX, @locY, @locZ, @eastOverrideHandle, @westOverrideHandle, @southOverrideHandle, @northOverrideHandle, @regionAssetURI, @regionAssetRecvKey, ";
            sql +=
                "@regionAssetSendKey, @regionUserURI, @regionUserRecvKey, @regionUserSendKey, @regionMapTexture, @serverHttpPort, @serverRemotingPort, @owner_uuid);";

            Dictionary<string, string> parameters = new Dictionary<string, string>();

            parameters["regionHandle"] = profile.regionHandle.ToString();
            parameters["regionName"] = profile.regionName;
            parameters["uuid"] = profile.UUID.ToString();
            parameters["regionRecvKey"] = profile.regionRecvKey;
            parameters["regionSecret"] = profile.regionSecret;
            parameters["regionSendKey"] = profile.regionSendKey;
            parameters["regionDataURI"] = profile.regionDataURI;
            parameters["serverIP"] = profile.serverIP;
            parameters["serverPort"] = profile.serverPort.ToString();
            parameters["serverURI"] = profile.serverURI;
            parameters["locX"] = profile.regionLocX.ToString();
            parameters["locY"] = profile.regionLocY.ToString();
            parameters["locZ"] = profile.regionLocZ.ToString();
            parameters["eastOverrideHandle"] = profile.regionEastOverrideHandle.ToString();
            parameters["westOverrideHandle"] = profile.regionWestOverrideHandle.ToString();
            parameters["northOverrideHandle"] = profile.regionNorthOverrideHandle.ToString();
            parameters["southOverrideHandle"] = profile.regionSouthOverrideHandle.ToString();
            parameters["regionAssetURI"] = profile.regionAssetURI;
            parameters["regionAssetRecvKey"] = profile.regionAssetRecvKey;
            parameters["regionAssetSendKey"] = profile.regionAssetSendKey;
            parameters["regionUserURI"] = profile.regionUserURI;
            parameters["regionUserRecvKey"] = profile.regionUserRecvKey;
            parameters["regionUserSendKey"] = profile.regionUserSendKey;
            parameters["regionMapTexture"] = profile.regionMapTextureID.ToString();
            parameters["serverHttpPort"] = profile.httpPort.ToString();
            parameters["serverRemotingPort"] = profile.remotingPort.ToString();
            parameters["owner_uuid"] = profile.owner_uuid.ToString();

            bool returnval = false;

            try
            {
                IDbCommand result = database.Query(sql, parameters);

                if (result.ExecuteNonQuery() == 1)
                    returnval = true;

                result.Dispose();
            }
            catch (Exception e)
            {
                m_log.Error("MSSQLManager : " + e.ToString());
            }

            return returnval;
        }

        /// <summary>
        /// DEPRECATED. Attempts to authenticate a region by comparing a shared secret.
        /// </summary>
        /// <param name="uuid">The UUID of the challenger</param>
        /// <param name="handle">The attempted regionHandle of the challenger</param>
        /// <param name="authkey">The secret</param>
        /// <returns>Whether the secret and regionhandle match the database entry for UUID</returns>
        override public bool AuthenticateSim(LLUUID uuid, ulong handle, string authkey)
        {
            bool throwHissyFit = false; // Should be true by 1.0

            if (throwHissyFit)
                throw new Exception("CRYPTOWEAK AUTHENTICATE: Refusing to authenticate due to replay potential.");

            RegionProfileData data = GetProfileByLLUUID(uuid);

            return (handle == data.regionHandle && authkey == data.regionSecret);
        }

        /// <summary>
        /// NOT YET FUNCTIONAL. Provides a cryptographic authentication of a region
        /// </summary>
        /// <remarks>This requires a security audit.</remarks>
        /// <param name="uuid"></param>
        /// <param name="handle"></param>
        /// <param name="authhash"></param>
        /// <param name="challenge"></param>
        /// <returns></returns>
        public bool AuthenticateSim(LLUUID uuid, ulong handle, string authhash, string challenge)
        {
            SHA512Managed HashProvider = new SHA512Managed();
            ASCIIEncoding TextProvider = new ASCIIEncoding();

            byte[] stream = TextProvider.GetBytes(uuid.ToString() + ":" + handle.ToString() + ":" + challenge);
            byte[] hash = HashProvider.ComputeHash(stream);
            return false;
        }

        override public ReservationData GetReservationAtPoint(uint x, uint y)
        {
            return null;
        }
    }
}