/*
 * Copyright (C) 2008-2010 TrinityCore <http://www.trinitycore.org/>
 * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */

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

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

#include "Configuration/Config.h"
#include "Log.h"
#include "SystemConfig.h"
#include "Util.h"
#include "SignalHandler.h"
#include "RealmList.h"
#include "RealmAcceptor.h"

#include <ace/Dev_Poll_Reactor.h>
#include <ace/TP_Reactor.h>
#include <ace/ACE.h>
#include <ace/Sig_Handler.h>

#include <openssl/opensslv.h>
#include <openssl/crypto.h>

#ifndef _TRINITY_REALM_CONFIG
# define _TRINITY_REALM_CONFIG  "authserver.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();

bool stopEvent = false;                                     ///< Setting it to true stops the server

LoginDatabaseWorkerPool LoginDatabase;                      ///< Accessor to the realm server database

/// Handle realmd's termination signals
class RealmdSignalHandler : public Trinity::SignalHandler
{
    public:
        virtual void HandleSignal(int SigNum)
        {
            switch (SigNum)
            {
                case SIGINT:
                case SIGTERM:
                    stopEvent = true;
                    break;
                #ifdef _WIN32
                case SIGBREAK:
                    if (m_ServiceStatus != 1)
                        stopEvent = true;
                    break;
                #endif /* _WIN32 */
            }
        }
};

/// 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("Invalid or missing configuration file : %s", cfg_file);
        sLog.outError("Verify that the file exists and has \'[authserver]\' written in the top of the 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);

    sLog.outDetail("%s (Library: %s)", OPENSSL_VERSION_TEXT, SSLeay_version(SSLEAY_VERSION));

#if defined (ACE_HAS_EVENT_POLL) || defined (ACE_HAS_DEV_POLL)
    ACE_Reactor::instance(new ACE_Reactor(new ACE_Dev_Poll_Reactor(ACE::max_handles(), 1), 1), true);
#else
    ACE_Reactor::instance(new ACE_Reactor(new ACE_TP_Reactor(), true), true);
#endif

    sLog.outBasic("Max allowed open files is %d", ACE::max_handles());

    /// 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
    sLog.SetLogDBLater(sConfig.GetBoolDefault("EnableLogDB", false)); // set var to enable DB logging once startup finished.
    sLog.SetLogDB(false);
    sLog.SetRealmID(0);                                               // ensure we've set realm to 0 (realmd realmid)

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

    ///- Launch the listening network socket
    RealmAcceptor acceptor;

    uint16 rmport = sConfig.GetIntDefault("RealmServerPort", 3724);
    std::string bind_ip = sConfig.GetStringDefault("BindIP", "0.0.0.0");

    ACE_INET_Addr bind_addr(rmport, bind_ip.c_str());

    if (acceptor.open(bind_addr, ACE_Reactor::instance(), ACE_NONBLOCK) == -1)
    {
        sLog.outError("Trinity realm can not bind to %s:%d", bind_ip.c_str(), rmport);
        return 1;
    }

    // Initialise the signal handlers
    RealmdSignalHandler SignalINT, SignalTERM;
    #ifdef _WIN32
    RealmdSignalHandler SignalBREAK;
    #endif /* _WIN32 */

    // Register realmd's signal handlers
    ACE_Sig_Handler Handler;
    Handler.register_handler(SIGINT, &SignalINT);
    Handler.register_handler(SIGTERM, &SignalTERM);
    #ifdef _WIN32
    Handler.register_handler(SIGBREAK, &SignalBREAK);
    #endif /* _WIN32 */

    ///- 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("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);

    ///- Wait for termination signal
    while (!stopEvent)
    {
        // dont move this outside the loop, the reactor will modify it
        ACE_Time_Value interval(0, 100000);

        if (ACE_Reactor::instance()->run_reactor_event_loop(interval) == -1)
            break;

        if ((++loopCounter) == numLoops)
        {
            loopCounter = 0;
            sLog.outDetail("Ping MySQL to keep connection alive");
            LoginDatabase.KeepAlive();
        }
#ifdef _WIN32
        if (m_ServiceStatus == 0) stopEvent = true;
        while (m_ServiceStatus == 2) Sleep(1000);
#endif
    }

    ///- Close the Database Pool
    LoginDatabase.Close();

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

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

    uint8 worker_threads = sConfig.GetIntDefault("LoginDatabase.WorkerThreads", 1);
    if (worker_threads < 1 || worker_threads > 32)
    {
        sLog.outError("Improper value specified for LoginDatabase.WorkerThreads, defaulting to 1.");
        worker_threads = 1;
    }

    uint8 synch_threads = sConfig.GetIntDefault("LoginDatabase.SynchThreads", 1);
    if (synch_threads < 1 || synch_threads > 32)
    {
        sLog.outError("Improper value specified for LoginDatabase.SynchThreads, defaulting to 1.");
        synch_threads = 1;
    }

    /// NOTE: While authserver is singlethreaded you should keep synch_threads == 1. Increasing it is just silly since only 1 will be used ever.
    if (!LoginDatabase.Open(dbstring.c_str(), worker_threads, synch_threads))
    {
        sLog.outError("Cannot connect to database");
        return false;
    }

    return true;
}

/// @}