/*
 *
 * (C) 2013-25 - ntop.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 3 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.
 *
 */

#ifndef _DB_CLASS_H_
#define _DB_CLASS_H_

#include "ntop_includes.h"

typedef int db_result_row_callback(char *row[], char *fields[], int num_fields, void *user_data);

class DB {
 private:
  struct timeval lastUpdateTime;
  float exportRate;
  u_int64_t exportedFlows, lastExportedFlows;
  /* Multiple threads can inc in case of view interfaces */
  std::atomic<u_int32_t> droppedFlows;
  std::atomic<u_int32_t> queueDroppedFlows;
  u_int64_t checkpointExportedFlows;
  u_int32_t checkpointDroppedFlows, checkpointQueueDroppedFlows;

 protected:
  bool running;
  NetworkInterface *iface;

 public:
  DB(NetworkInterface *_iface);
  virtual ~DB(){};

  inline void incNumExportedFlows(u_int64_t num = 1) { exportedFlows += num; };
  inline void incNumDroppedFlows(u_int32_t num = 1) { droppedFlows += num; };
  inline void incNumQueueDroppedFlows(u_int32_t num = 1) {
    queueDroppedFlows += num;
  };

  inline u_int64_t getNumExportedFlows() const { return (exportedFlows); }
  inline u_int32_t getNumDroppedFlows() const {
    return (queueDroppedFlows + droppedFlows);
  };
  void updateStats(const struct timeval *tv);
  void checkPointCounters(bool drops_only);

  /* Pure Virtual Functions of a DB flow exporter */
  virtual bool dumpFlow(time_t when, Flow *f, char *json) = 0;
  virtual bool startQueryLoop() { return (false); }

  virtual int exec_sql_query(const char *sql, bool doReconnect = true,
                     bool ignoreErrors = false, bool doLock = true,
                     db_result_row_callback *cb = NULL,
                     void *cb_user_data = NULL) {
    return (-1);
  }

  virtual int exec_sql_query(lua_State *vm, char *sql, bool limitRows,
                             bool wait_for_db_created) {
    return (-1);
  }

  inline void startDBLoop() {
    if (startQueryLoop()) running = true;
  };
  inline int isRunning() { return (running); };
  virtual bool isDbCreated() { return (true); };
  virtual void shutdown();
  virtual void flush(){};
  virtual void lua(lua_State *vm, bool since_last_checkpoint) const;
  virtual int select_database(char *dbname) { return (-1); }
  virtual void checkIdle(time_t when) { ; }
};

#endif /* _DB_CLASS_H_ */
