/*
 * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
 *
 * Copyright (C) 2008-2009 Trinity <http://www.trinitycore.org/>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/// \addtogroup realmd Realm Daemon
/// @{
/// \file

#include "Common.h"
#include "Database/DatabaseEnv.h"
#include "RealmList.h"

#include "Config/ConfigEnv.h"
#include "Log.h"
#include "sockets/ListenSocket.h"
#include "AuthSocket.h"
#include "SystemConfig.h"
#include "Util.h"
#include <openssl/opensslv.h>
#include <openssl/crypto.h>

// Format is YYYYMMDDRR where RR is the change in the conf file
// for that day.
#ifndef _REALMDCONFVERSION
# define _REALMDCONFVERSION 2009081701
#endif

#ifndef _TRINITY_REALM_CONFIG
# define _TRINITY_REALM_CONFIG  "TrinityRealm.conf"
#endif //_TRINITY_REALM_CONFIG

#ifdef WIN32
#include "ServiceWin32.h"
char serviceName[] = "TrinityRealm";
char serviceLongName[] = "Trinity realm service";
char serviceDescription[] = "Massive Network Game Object Server";
/*
 * -1 - not in service mode
 *  0 - stopped
 *  1 - running
 *  2 - paused
 */
int m_ServiceStatus = -1;
#endif

bool StartDB();
void UnhookSignals();
void HookSignals();

bool stopEvent = false;                                     ///< Setting it to true stops the server
RealmList m_realmList;                                      ///< Holds the list of realms for this server

DatabaseType loginDatabase;                                 ///< Accessor to the realm server database

/// Print out the usage string for this program on the console.
void usage(const char *prog)
{
    sLog.outString("Usage: \n %s [<options>]\n"
        "    -c config_file           use config_file as configuration file\n\r"
        #ifdef WIN32
        "    Running as service functions:\n\r"
        "    --service                run as service\n\r"
        "    -s install               install service\n\r"
        "    -s uninstall             uninstall service\n\r"
        #endif
        ,prog);
}

/// Launch the realm server
extern int main(int argc, char **argv)
{
    sLog.SetLogDB(false);
    ///- Command line parsing to get the configuration file name
    char const* cfg_file = _TRINITY_REALM_CONFIG;
    int c=1;
    while(c < argc)
    {
        if (strcmp(argv[c],"-c") == 0)
        {
            if (++c >= argc)
            {
                sLog.outError("Runtime-Error: -c option requires an input argument");
                usage(argv[0]);
                return 1;
            }
            else
                cfg_file = argv[c];
        }

        #ifdef WIN32
        ////////////
        //Services//
        ////////////
        if (strcmp(argv[c],"-s") == 0)
        {
            if (++c >= argc)
            {
                sLog.outError("Runtime-Error: -s option requires an input argument");
                usage(argv[0]);
                return 1;
            }
            if (strcmp(argv[c],"install") == 0)
            {
                if (WinServiceInstall())
                    sLog.outString("Installing service");
                return 1;
            }
            else if (strcmp(argv[c],"uninstall") == 0)
            {
                if (WinServiceUninstall())
                    sLog.outString("Uninstalling service");
                return 1;
            }
            else
            {
                sLog.outError("Runtime-Error: unsupported option %s",argv[c]);
                usage(argv[0]);
                return 1;
            }
        }
        if (strcmp(argv[c],"--service") == 0)
        {
            WinServiceRun();
        }
        ////
        #endif
        ++c;
    }

    if (!sConfig.SetSource(cfg_file))
    {
        sLog.outError("Could not find configuration file %s.", cfg_file);
        return 1;
    }
    sLog.Initialize();

    sLog.outString("%s (realm-daemon)", _FULLVERSION);
    sLog.outString("<Ctrl-C> to stop.\n");
    sLog.outString("Using configuration file %s.", cfg_file);

    ///- Check the version of the configuration file
    uint32 confVersion = sConfig.GetIntDefault("ConfVersion", 0);
    if (confVersion < _REALMDCONFVERSION)
    {
        sLog.outError("*****************************************************************************");
        sLog.outError(" WARNING: Your trinityrealm.conf version indicates your conf file is out of date!");
        sLog.outError("          Please check for updates, as your current default values may cause");
        sLog.outError("          strange behavior.");
        sLog.outError("*****************************************************************************");
        clock_t pause = 3000 + clock();

        while (pause > clock()) {}
    }

    sLog.outDetail("%s (Library: %s)", OPENSSL_VERSION_TEXT, SSLeay_version(SSLEAY_VERSION));
    if (SSLeay() < 0x009080bfL)
    {
        sLog.outError("Outdated version of OpenSSL lib. Logins to server impossible!");
        sLog.outError("Minimal required version [OpenSSL 0.9.8k]");
        clock_t pause = 5000 + clock();
        while (pause > clock()) {}
        return 1;
    }

    /// realmd PID file creation
    std::string pidfile = sConfig.GetStringDefault("PidFile", "");
    if (!pidfile.empty())
    {
        uint32 pid = CreatePIDFile(pidfile);
        if (!pid)
        {
            sLog.outError("Cannot create PID file %s.\n", pidfile.c_str());
            return 1;
        }

        sLog.outString("Daemon PID: %u\n", pid);
    }

    ///- Initialize the database connection
    if (!StartDB())
        return 1;

    ///- Initialize the log database
    if (sConfig.GetBoolDefault("EnableLogDB", false))
    {
        // everything successful - set var to enable DB logging once startup finished.
        sLog.SetLogDBLater(true);
        sLog.SetLogDB(false);
        // ensure we've set realm to 0 (realmd realmid)
        sLog.SetRealmID(0);
    }
    else
    {
        sLog.SetLogDBLater(false);
        sLog.SetLogDB(false);
        sLog.SetRealmID(0);
    }

    ///- Get the list of realms for the server
    m_realmList.Initialize(sConfig.GetIntDefault("RealmsStateUpdateDelay", 20));
    if (m_realmList.size() == 0)
    {
        sLog.outError("No valid realms specified.");
        return 1;
    }

    ///- Launch the listening network socket
    port_t rmport = sConfig.GetIntDefault("RealmServerPort", DEFAULT_REALMSERVER_PORT);
    std::string bind_ip = sConfig.GetStringDefault("BindIP", "0.0.0.0");

    SocketHandler h;
    ListenSocket<AuthSocket> authListenSocket(h);
    if (authListenSocket.Bind(bind_ip.c_str(),rmport))
    {
        sLog.outError("Trinity realm can not bind to %s:%d",bind_ip.c_str(), rmport);
        return 1;
    }

    h.Add(&authListenSocket);

    ///- Catch termination signals
    HookSignals();

    ///- Handle affinity for multiple processors and process priority on Windows
    #ifdef WIN32
    {
        HANDLE hProcess = GetCurrentProcess();

        uint32 Aff = sConfig.GetIntDefault("UseProcessors", 0);
        if (Aff > 0)
        {
            ULONG_PTR appAff;
            ULONG_PTR sysAff;

            if (GetProcessAffinityMask(hProcess,&appAff,&sysAff))
            {
                ULONG_PTR curAff = Aff & appAff;            // remove non accessible processors

                if (!curAff)
                {
                    sLog.outError("Processors marked in UseProcessors bitmask (hex) %x not accessible for realmd. Accessible processors bitmask (hex): %x",Aff,appAff);
                }
                else
                {
                    if (SetProcessAffinityMask(hProcess,curAff))
                        sLog.outString("Using processors (bitmask, hex): %x", curAff);
                    else
                        sLog.outError("Can't set used processors (hex): %x", curAff);
                }
            }
            sLog.outString();
        }

        bool Prio = sConfig.GetBoolDefault("ProcessPriority", false);

        if (Prio)
        {
            if (SetPriorityClass(hProcess,HIGH_PRIORITY_CLASS))
                sLog.outString("TrinityRealm process priority class set to HIGH");
            else
                sLog.outError("ERROR: Can't set realmd process priority class.");
            sLog.outString();
        }
    }
    #endif

    // maximum counter for next ping
    uint32 numLoops = (sConfig.GetIntDefault("MaxPingTime", 30) * (MINUTE * 1000000 / 100000));
    uint32 loopCounter = 0;

    // possibly enable db logging; avoid massive startup spam by doing it here.
    if (sLog.GetLogDBLater())
    {
        sLog.outString("Enabling database logging...");
        sLog.SetLogDBLater(false);
        // login db needs thread for logging
        sLog.SetLogDB(true);
    }
    else
    {
        sLog.SetLogDB(false);
        sLog.SetLogDBLater(false);
    }

    ///- Wait for termination signal
    while (!stopEvent)
    {

        h.Select(0, 100000);

        if ((++loopCounter) == numLoops)
        {
            loopCounter = 0;
            sLog.outDetail("Ping MySQL to keep connection alive");
            delete loginDatabase.Query("SELECT 1 FROM realmlist LIMIT 1");
        }
#ifdef WIN32
        if (m_ServiceStatus == 0) stopEvent = true;
        while (m_ServiceStatus == 2) Sleep(1000);
#endif
    }

    ///- Wait for the delay thread to exit
    loginDatabase.ThreadEnd();
    loginDatabase.HaltDelayThread();

    ///- Remove signal handling before leaving
    UnhookSignals();

    sLog.outString("Halting process...");
    return 0;
}

/// Handle termination signals
/** Put the global variable stopEvent to 'true' if a termination signal is caught **/
void OnSignal(int s)
{
    switch (s)
    {
        case SIGINT:
        case SIGTERM:
            stopEvent = true;
            break;
        #ifdef _WIN32
        case SIGBREAK:
            if (m_ServiceStatus != 1)
                stopEvent = true;
            break;
        #endif
    }

    signal(s, OnSignal);
}

/// Initialize connection to the database
bool StartDB()
{
    std::string dbstring = sConfig.GetStringDefault("loginDatabaseInfo", "");
    if (dbstring.empty())
    {
        sLog.outError("Database not specified");
        return false;
    }

    if (!loginDatabase.Initialize(dbstring.c_str()))
    {
        sLog.outError("Cannot connect to database");
        return false;
    }
    loginDatabase.ThreadStart();

    return true;
}

/// Define hook 'OnSignal' for all termination signals
void HookSignals()
{
    signal(SIGINT, OnSignal);
    signal(SIGTERM, OnSignal);
    #ifdef _WIN32
    if (m_ServiceStatus != 1)
        signal(SIGBREAK, OnSignal);
    #endif
}

/// Unhook the signals before leaving
void UnhookSignals()
{
    signal(SIGINT, 0);
    signal(SIGTERM, 0);
    #ifdef _WIN32
    if (m_ServiceStatus != 1)
        signal(SIGBREAK, 0);
    #endif
}

/// @}