/* Copyright (C) 2014 InfiniDB, Inc.

   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; version 2 of
   the License.

   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., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301, USA. */

/*******************************************************************************
 * $Id: we_config.h 4726 2013-08-07 03:38:36Z bwilkinson $
 *
 *******************************************************************************/
/** @file */

#pragma once

#include <string>
#include <boost/thread.hpp>
#include <vector>
#include <map>

#include "we_obj.h"

// #define SHARED_NOTHING_DEMO_2

#define EXPORT

/** Namespace WriteEngine */
namespace WriteEngine
{
/** Class Config */
class Config
{
 public:
  /**
   * @brief Constructor
   */
  Config() = default;

  /**
   * @brief Default Destructor
   */
  ~Config() = default;

  /**
   * @brief Get DB root (for local PM)
   * @param idx Index of the DBRootn entry to fetch (0 fetches DBRoot[0],etc.)
   */
  EXPORT static std::string getDBRootByIdx(unsigned idx);

  /**
   * @brief Get complete DBRoot path list for the local PM
   * @param dbRootPathList vector of DBRoot paths
   */
  EXPORT static void getDBRootPathList(std::vector<std::string>& dbRootPathList);

  /**
   * @brief Get DB root (for local PM)
   * @param num DBRootN entry to fetch (1 fetches DBRoot1, etc.)
   */
  EXPORT static std::string getDBRootByNum(unsigned num);

  /**
   * @brief Get list of applicable DBRoot ids for this job.
   */
  EXPORT static void getRootIdList(std::vector<uint16_t>& dbRootIds);

#ifdef SHARED_NOTHING_DEMO_2
  EXPORT static void getSharedNothingRoot(char*);  // pass in an char[FILE_NAME_SIZE]
#endif

  /**
   * @brief Bulkload DB root
   */
  EXPORT static std::string getBulkRoot();

  /**
   * @brief DBRoot count for local PM
   */
  EXPORT static size_t DBRootCount();

  /**
   * @brief Wait Period
   */
  EXPORT static int getWaitPeriod();

  /**
   * @brief FilesPerColumnPartition
   */
  EXPORT static unsigned getFilesPerColumnPartition();

  /**
   * @brief ExtentsPerSegmentFile
   */
  EXPORT static unsigned getExtentsPerSegmentFile();

  /**
   * @brief Process Priority for cpimport.bin
   * Return value is in range -20..19 (highest...lowest, 0=normal)
   */
  EXPORT static int getBulkProcessPriority();

  /**
   * @brief Directory carrying Bulk Rollback meta data files
   */
  EXPORT static std::string getBulkRollbackDir();

  /**
   * @brief MCOL-5021 Option to enable/disable fast deletes.
   * When enabled (option is disabled by default),
   * all column extents are indiscriminately invalidated
   * and actual delete is only performed on the AUX column.
   */
  EXPORT static bool getFastDelete();

  /**
   * @brief Max percentage of allowable file system disk usage for each DBRoot
   */
  EXPORT static unsigned getMaxFileSystemDiskUsage();

  /**
   * @brief Number of Blocks to pad each compressed chunk.
   */
  EXPORT static unsigned getNumCompressedPadBlks();

  /**
   * @brief Parent OAM Module flag (is this the parent OAM node, ex: pm1)
   */
  EXPORT static bool getParentOAMModuleFlag();

  /**
   * @brief Local Module Type (ex: "pm")
   */
  EXPORT static std::string getLocalModuleType();

  /**
   * @brief Local Module ID   (ex: 1   )
   */
  EXPORT static uint16_t getLocalModuleID();

  /**
   * @brief Version Buffer root
   */
  EXPORT static std::string getVBRoot();

  /**
   * @brief Cache the config parameters locally
   * Initialize Config cache.  Cache will be updated as needed.
   */
  EXPORT static void initConfigCache();

  /**
   * @brief Has Local PM DBRoot info changed since last time this function
   * was called.  Can be used to monitor changes to DBRoot info.
   */
  EXPORT static bool hasLocalDBRootListChanged();

 private:
  typedef std::vector<std::string> strvec_t;
  typedef std::map<int, std::string> intstrmap_t;
  typedef std::vector<uint16_t> uint16vec_t;

  static void checkReload();

  static int m_dbRootCount;                 // num DBRoots for local PM
  static strvec_t m_dbRootPath;             // root paths for open files
  static intstrmap_t m_dbRootPathMap;       // map of root id to root paths
  static uint16vec_t m_dbRootId;            // list of root ids
  static std::string m_bulkRoot;            // root path for bulk operation
  static unsigned long fDBRootChangeCount;  // track recent DBRoot changes
  static time_t fCacheTime;                 // timestamp associated w/cache
  static boost::mutex fCacheLock;           // mutex for m_dbRoot sync
#ifdef SHARED_NOTHING_DEMO_2
  static boost::mutex m_bulkRoot_lk;  // mutex for m_bulkRoot sync
#endif
  static int m_WaitPeriod;                    // secs to wait for transaction
  static unsigned m_FilesPerColumnPartition;  // # seg files per partition
  static unsigned m_ExtentsPerSegmentFile;    // # extents per segment file
  static int m_BulkProcessPriority;           // cpimport.bin proc priority
  static std::string m_BulkRollbackDir;       // bulk rollback meta data dir
  static bool m_FastDelete;                   // fast delete option
  static unsigned m_MaxFileSystemDiskUsage;   // max file system % disk usage
  static unsigned m_NumCompressedPadBlks;     // num blks to pad comp chunks
  static bool m_ParentOAMModuleFlag;          // are we running on parent PM
  static std::string m_LocalModuleType;       // local node type (ex: "pm")
  static int m_LocalModuleID;                 // local node id   (ex: 1   )
  static std::string m_VersionBufferDir;      // Version buffer directory
};

}  // namespace WriteEngine

#undef EXPORT