/*
 * 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;
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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.Data.SqlClient;
using System.Reflection;
using System.Collections.Generic;
using System.Data;
using log4net;
using OpenSim.Framework;

namespace OpenSim.Data.MSSQL
{
    /// <summary>
    /// An interface to the log database for MSSQL
    /// </summary>
    internal class MSSQLLogData : ILogDataPlugin
    {
        private const string _migrationStore = "LogStore";

        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        /// <summary>
        /// The database manager
        /// </summary>
        public MSSQLManager database;

        public void Initialise()
        {
            m_log.Info("[LOG DB]: " + Name + " cannot be default-initialized!");
            throw new PluginNotInitialisedException (Name);
        }

        /// <summary>
        /// Artificial constructor called when the plugin is loaded
        /// </summary>
        public void Initialise(string connect)
        {
            if (string.IsNullOrEmpty(connect))
            {
                database = new MSSQLManager(connect);
            }
            else
            {
                // TODO: do something with the connect string
                IniFile gridDataMSSqlFile = new IniFile("mssql_connection.ini");
                string settingDataSource = gridDataMSSqlFile.ParseFileReadValue("data_source");
                string settingInitialCatalog = gridDataMSSqlFile.ParseFileReadValue("initial_catalog");
                string settingPersistSecurityInfo = gridDataMSSqlFile.ParseFileReadValue("persist_security_info");
                string settingUserId = gridDataMSSqlFile.ParseFileReadValue("user_id");
                string settingPassword = gridDataMSSqlFile.ParseFileReadValue("password");

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

            //TODO when can this be removed
            TestTable();

            //Updating mechanisme
            database.CheckMigration(_migrationStore);
        }

        /// <summary>
        /// Can be removed someday!!!
        /// </summary>
        private void TestTable()
        {
            using (IDbCommand cmd = database.Query("select top 1 * from logs", new Dictionary<string, string>()))
            {
                try
                {
                    cmd.ExecuteNonQuery();
                }
                catch
                {
                    database.ExecuteResourceSql("Mssql-logs.sql");
                }
            }
            using (AutoClosingSqlCommand cmd = database.Query("select * from migrations where name = '" + _migrationStore + "'"))
            {
                //Special for Migrations to create backword compatible
                try
                {
                    bool insert = true;
                    using (SqlDataReader reader = cmd.ExecuteReader())
                    {
                        if (reader.Read()) insert = false;
                    }
                    if (insert)
                    {
                        cmd.CommandText = "insert into migrations(name, version) values('" + _migrationStore + "', 1)";
                        cmd.ExecuteNonQuery();
                    }
                }
                catch
                {
                    //No migrations table
                    //HACK create one and add data
                    cmd.CommandText = "create table migrations(name varchar(100), version int)";
                    cmd.ExecuteNonQuery();

                    cmd.CommandText = "insert into migrations(name, version) values('migrations', 1)";
                    cmd.ExecuteNonQuery();

                    cmd.CommandText = "insert into migrations(name, version) values('" + _migrationStore + "', 1)";
                    cmd.ExecuteNonQuery();
                }
            }
        }
        
        /// <summary>
        /// Saves a log item to the database
        /// </summary>
        /// <param name="serverDaemon">The daemon triggering the event</param>
        /// <param name="target">The target of the action (region / agent UUID, etc)</param>
        /// <param name="methodCall">The method call where the problem occured</param>
        /// <param name="arguments">The arguments passed to the method</param>
        /// <param name="priority">How critical is this?</param>
        /// <param name="logMessage">The message to log</param>
        public void saveLog(string serverDaemon, string target, string methodCall, string arguments, int priority,
                            string logMessage)
        {
            string sql = "INSERT INTO logs ([target], [server], [method], [arguments], [priority], [message]) VALUES ";
            sql += "(@target, @server, @method, @arguments, @priority, @message);";

            using (AutoClosingSqlCommand command = database.Query(sql))
            {
                command.Parameters.Add(database.CreateParameter("server", serverDaemon));
                command.Parameters.Add(database.CreateParameter("target",target));
                command.Parameters.Add(database.CreateParameter("method", methodCall));
                command.Parameters.Add(database.CreateParameter("arguments", arguments));
                command.Parameters.Add(database.CreateParameter("priority", priority.ToString()));
                command.Parameters.Add(database.CreateParameter("message", logMessage));

                try
                {
                    command.ExecuteNonQuery();
                }
                catch (Exception e)
                {
                    //Are we not in a loop here
                    //m_log.Error(e.ToString());
                    Console.WriteLine("[LOG DB] Error logging : " + e.Message);
                }
            }
        }

        /// <summary>
        /// Returns the name of this DB provider
        /// </summary>
        /// <returns>A string containing the DB provider name</returns>
        public string Name
        {
            get { return "MSSQL Logdata Interface"; }
        }

        /// <summary>
        /// Closes the database provider
        /// </summary>
        public void Dispose()
        {
            database = null;
        }

        /// <summary>
        /// Returns the version of this DB provider
        /// </summary>
        /// <returns>A string containing the provider version</returns>
        public string Version
        {
            get { return "0.1"; }
        }
    }
}
