/*
 *    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
 */

/*
 *    Author : Boris Mikhailenko <stg34@stargazer.dp.ua>
 *    Author : Maxim Mamontov <faust@stargazer.dp.ua>
 */

#pragma once

#include "stg/plugin.h"
#include "stg/module_settings.h"
#include "stg/subscriptions.h"
#include "stg/user.h"
#include "stg/blowfish.h"
#include "stg/rs_packets.h"
#include "stg/logger.h"

#include "nrmap_parser.h"

#include <string>
#include <list>
#include <map>
#include <functional>
#include <utility>
#include <mutex>
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wshadow"
#include <jthread.hpp>
#pragma GCC diagnostic pop
#include <cstdint>

namespace STG
{
struct Settings;
struct Settings;

namespace RS
{

using UserPtr = User*;
class UpdateRouter;

//-----------------------------------------------------------------------------
struct USER
{
    USER(const std::vector<uint32_t> & r, UserPtr it)
        : lastSentTime(0),
          user(it),
          routers(r),
          shortPacketsCount(0),
          ip(user->GetCurrIP())
    {}

    time_t lastSentTime;
    UserPtr user;
    std::vector<uint32_t> routers;
    int shortPacketsCount;
    uint32_t ip;
};
//-----------------------------------------------------------------------------
class SETTINGS
{
    public:
                            SETTINGS();
        virtual             ~SETTINGS() {}
        const std::string & GetStrError() const { return errorStr; }
        int                 ParseSettings(const ModuleSettings & s);
        int                 GetSendPeriod() const { return sendPeriod; }
        uint16_t            GetPort() const { return port; }
        const std::vector<NET_ROUTER> & GetSubnetsMap() const { return netRouters; }
        const std::vector<std::string> & GetUserParams() const { return userParams; }
        const std::string & GetPassword() const { return password; }
        const std::string & GetMapFileName() const { return subnetFile; }

    private:
        int                 sendPeriod;
        uint16_t            port;
        std::string         errorStr;
        std::vector<NET_ROUTER> netRouters;
        std::vector<std::string> userParams;
        std::string         password;
        std::string         subnetFile;
};
//-----------------------------------------------------------------------------
class REMOTE_SCRIPT : public Plugin
{
    public:
                            REMOTE_SCRIPT();

        void                SetUsers(Users * u) override { users = u; }
        void                SetSettings(const ModuleSettings & s) override { settings = s; }
        int                 ParseSettings() override;

        int                 Start() override;
        int                 Stop() override;
        int                 Reload(const ModuleSettings & ms) override;
        bool                IsRunning() override { return isRunning; }

        const std::string & GetStrError() const override { return errorStr; }
        std::string         GetVersion() const override { return "Remote script v 0.3"; }
        uint16_t            GetStartPosition() const override { return 10; }
        uint16_t            GetStopPosition() const override { return 10; }

        void                DelUser(UserPtr u) { UnSetUserNotifiers(u); }
        void                AddUser(UserPtr u) { SetUserNotifiers(u); }

        void                AddRSU(UserPtr user);
        void                DelRSU(UserPtr user);

    private:
        REMOTE_SCRIPT(const REMOTE_SCRIPT & rhs);
        REMOTE_SCRIPT & operator=(const REMOTE_SCRIPT & rhs);

        void                Run(std::stop_token token);
        bool                PrepareNet();
        bool                FinalizeNet();

        bool                Send(USER & rsu, bool forceDisconnect = false) const;
        bool                SendDirect(USER & rsu, uint32_t routerIP, bool forceDisconnect = false) const;
        bool                PreparePacket(char * buf, size_t bufSize, USER &rsu, bool forceDisconnect = false) const;
        void                PeriodicSend();

        std::vector<uint32_t> IP2Routers(uint32_t ip);
        bool                GetUsers();

        void                SetUserNotifiers(UserPtr u);
        void                UnSetUserNotifiers(UserPtr u);

        void                InitEncrypt(const std::string & password) const;
        void                Encrypt(void * dst, const void * src, size_t len8) const;

        mutable BLOWFISH_CTX ctx;
        std::map<uint32_t, USER> authorizedUsers;

        mutable std::string errorStr;
        SETTINGS         rsSettings;
        ModuleSettings     settings;
        int                 sendPeriod;
        int                 halfPeriod;

        bool                isRunning;

        Users *             users;

        std::vector<NET_ROUTER> netRouters;

        std::jthread        m_thread;
        std::mutex          m_mutex;

        int                 sock;

        ScopedConnection m_onAddUserConn;
        ScopedConnection m_onDelUserConn;

        void addDelUser(UserPtr user, bool toAdd);

        using ConnHolder = std::tuple<int, ScopedConnection, ScopedConnection>;
        std::vector<ConnHolder> m_conns;

        PluginLogger       logger;

        friend class RS::UpdateRouter;
};
//-----------------------------------------------------------------------------

} // namespace RS
}