/*
 *    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>
 */

#pragma once

#include "settings_impl.h"
#include "user_impl.h"
#include "stg/store.h"
#include "stg/users.h"
#include "stg/user.h"
#include "stg/tariffs.h"
#include "stg/logger.h"
#include "stg/noncopyable.h"

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

namespace STG
{

const int userDeleteDelayTime = 120;

typedef std::list<UserImpl>::iterator user_iter;
typedef std::list<UserImpl>::const_iterator const_user_iter;

//-----------------------------------------------------------------------------
struct USER_TO_DEL {
USER_TO_DEL()
    : iter(),
      delTime(0)
{}

std::list<UserImpl>::iterator iter;
time_t  delTime;
};
//-----------------------------------------------------------------------------
class UsersImpl : public Users
{
    public:
        using UserImplPtr = UserImpl*;

        UsersImpl(SettingsImpl * s, Store * store,
                  Tariffs * tariffs, Services & svcs,
                  const Admin& sysAdmin);

        int             FindByName(const std::string & login, UserPtr * user) override;
        int             FindByName(const std::string & login, ConstUserPtr * user) const override;
        bool            Exists(const std::string & login) const override;

        bool            TariffInUse(const std::string & tariffName) const override;

        template <typename F>
        auto            onImplAdd(F&& f) { return m_onAddImplCallbacks.add(std::forward<F>(f)); }
        template <typename F>
        auto            onImplDel(F&& f) { return m_onDelImplCallbacks.add(std::forward<F>(f)); }

        int             Add(const std::string & login, const Admin * admin) override;
        void            Del(const std::string & login, const Admin * admin) override;

        bool            Authorize(const std::string & login, uint32_t ip,
                                  uint32_t enabledDirs, const Auth * auth) override;
        bool            Unauthorize(const std::string & login,
                                    const Auth * auth,
                                    const std::string & reason) override;

        int             ReadUsers() override;
        size_t          Count() const override { return users.size(); }

        int             FindByIPIdx(uint32_t ip, UserPtr * user) const override;
        int             FindByIPIdx(uint32_t ip, UserImpl ** user) const;
        bool            IsIPInIndex(uint32_t ip) const override;
        bool            IsIPInUse(uint32_t ip, const std::string & login, ConstUserPtr * user) const override;

        unsigned int    OpenSearch() override;
        int             SearchNext(int handler, UserPtr * user) override;
        int             SearchNext(int handler, UserImpl ** user);
        int             CloseSearch(int handler) override;

        int             Start() override;
        int             Stop() override;

    private:
        UsersImpl(const UsersImpl & rvalue);
        UsersImpl & operator=(const UsersImpl & rvalue);

        void            AddToIPIdx(user_iter user);
        void            DelFromIPIdx(uint32_t ip);
        bool            FindByIPIdx(uint32_t ip, user_iter & iter) const;

        bool            FindByNameNonLock(const std::string & login, user_iter * user);
        bool            FindByNameNonLock(const std::string & login, const_user_iter * user) const;

        void            RealDelUser();
        void            ProcessActions();

        void            AddUserIntoIndexes(user_iter user);
        void            DelUserFromIndexes(user_iter user);

        void            Run(std::stop_token token);
        void            NewMinute(const struct tm & t);
        void            NewDay(const struct tm & t);
        void            DayResetTraff(const struct tm & t);

        bool            TimeToWriteDetailStat(const struct tm & t);

        std::list<UserImpl>                  users;
        std::list<USER_TO_DEL>                usersToDelete;

        std::map<uint32_t, user_iter>         ipIndex;
        std::map<std::string, user_iter>      loginIndex;

        SettingsImpl *     settings;
        Tariffs *           m_tariffs;
        Services &          m_services;
        Store *             m_store;
        const Admin&        m_sysAdmin;
        Logger &        WriteServLog;

        bool                isRunning;

        mutable std::mutex      m_mutex;
        std::jthread            m_thread;
        mutable unsigned int    handle;

        mutable std::map<unsigned int, user_iter>  searchDescriptors;

        Subscriptions<UserImplPtr> m_onAddImplCallbacks;
        Subscriptions<UserImplPtr> m_onDelImplCallbacks;
};

}