/*
  This file is part of TALER
  Copyright (C) 2014, 2015 Christian Grothoff (and other contributing authors)

  TALER 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, or (at your option) any later version.

  TALER 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
  TALER; see the file COPYING.  If not, If not, see <http://www.gnu.org/licenses/>
*/
/**
 * @file mintdb/perf_taler_mintdb_interpreter.h
 * @brief Library for performance analysis of the Taler database
 * @author Nicolas Fournier
 */

#ifndef __PERF_TALER_MINTDB_INTERPRETER_H__
#define __PERF_TALER_MINTDB_INTERPRETER_H__

#include <sys/time.h>
#include "taler_mintdb_plugin.h"

/**
 * Marks the end of the command chain
 * @param _label
 */
#define PERF_TALER_MINTDB_INIT_CMD_END(_label) \
{ \
  .command = PERF_TALER_MINTDB_CMD_END, \
  .label = _label, \
  .exposed.type = PERF_TALER_MINTDB_NONE \
}


/**
 * Prints @ _label to stdout
 */
#define PERF_TALER_MINTDB_INIT_CMD_DEBUG(_label) \
{ \
  .command = PERF_TALER_MINTDB_CMD_DEBUG, \
  .label = _label, \
  .exposed.type = PERF_TALER_MINTDB_NONE \
}

/**
 * The begining of a loop
 * @param _label the name of the loop
 * @param _iter the number of iterations of the loop
 */
#define PERF_TALER_MINTDB_INIT_CMD_LOOP(_label, _iter) \
{ \
  .command = PERF_TALER_MINTDB_CMD_LOOP , \
  .label = _label , \
  .exposed.type = PERF_TALER_MINTDB_NONE , \
  .details.loop = { \
    .max_iterations = _iter , \
    .curr_iteration = 0 } \
}

/**
 * Marks the end of the loop @_label_loop
 */
#define PERF_TALER_MINTDB_INIT_CMD_END_LOOP(_label, _label_loop) \
{\
  .command = PERF_TALER_MINTDB_CMD_END_LOOP , \
  .label = _label , \
  .exposed.type = PERF_TALER_MINTDB_NONE , \
  .details.end_loop.label_loop = _label_loop \
}

/**
 * Saves the time of execution to use for logging with Gauger
 */
#define PERF_TALER_MINTDB_INIT_CMD_GET_TIME(_label) \
{ \
  .command = PERF_TALER_MINTDB_CMD_GET_TIME, \
  .label = _label, \
  .exposed.type = PERF_TALER_MINTDB_NONE \
}

/**
 * Commits the duration between @a _label_start and @a _label_stop
 * to Gauger with @a _description explaining what was measured.
 *
 * @param _label_start label of the start of the measurment
 * @param _label_stop label of the end of the measurment
 * @param _description description of the measure displayed in Gauger
 * @param _divide number of measurments in the interval [FIXME: need UNIT]
 */
#define PERF_TALER_MINTDB_INIT_CMD_GAUGER(_label, _label_start, _label_stop, _description, _divide) \
{ \
  .command = PERF_TALER_MINTDB_CMD_GAUGER, \
  .label = _label, \
  .exposed.type = PERF_TALER_MINTDB_NONE, \
  .details.gauger = { \
    .label_start = _label_start, \
    .label_stop = _label_stop, \
    .description = _description, \
    .divide = _divide, \
  } \
}

/**
 * Initiate a database transaction
 */
#define PERF_TALER_MINTDB_INIT_CMD_START_TRANSACTION(_label) \
{ \
  .command = PERF_TALER_MINTDB_CMD_START_TRANSACTION, \
  .label = _label, \
  .exposed.type = PERF_TALER_MINTDB_NONE, \
}

/**
 * Commits a database transaction
 */
#define PERF_TALER_MINTDB_INIT_CMD_COMMIT_TRANSACTION(_label) \
{ \
  .command = PERF_TALER_MINTDB_CMD_COMMIT_TRANSACTION, \
  .label = _label, \
  .exposed.type = PERF_TALER_MINTDB_NONE, \
}

/**
 * Extracts @a _nb_saved items of type @a _save_type
 * from the command @a _label_save during the loop @a _label_loop
 */
#define PERF_TALER_MINTDB_INIT_CMD_SAVE_ARRAY(_label, _label_loop, _label_save, _nb_saved) \
{ \
  .command = PERF_TALER_MINTDB_CMD_SAVE_ARRAY, \
  .label = _label, \
  .exposed.type = PERF_TALER_MINTDB_NONE, \
  .details.save_array = { \
    .label_loop = _label_loop, \
    .label_save = _label_save, \
    .nb_saved = _nb_saved, \
  } \
}

/**
 * Loads @a _nb_saved previously sampled data of type @a _saved_type
 * from @a _label_save during the loop @a _label_loop
 */
#define PERF_TALER_MINTDB_INIT_CMD_LOAD_ARRAY(_label, _label_loop, _label_save) \
{ \
  .command = PERF_TALER_MINTDB_CMD_LOAD_ARRAY, \
  .label = _label, \
  .exposed.type = PERF_TALER_MINTDB_NONE, \
  .details.load_array = { \
    .label_loop = _label_loop, \
    .label_save = _label_save \
  } \
}

/**
 * Inserts informations about a denomination key in the database
 */
#define PERF_TALER_MINTDB_INIT_CMD_INSERT_DENOMINATION(_label) \
{ \
  .command = PERF_TALER_MINTDB_CMD_INSERT_DENOMINATION, \
  .label = _label, \
  .exposed.type = PERF_TALER_MINTDB_DENOMINATION_INFO, \
}

/**
 * Polls the database about informations regarding a specific denomination key
 */
#define PERF_TALER_MINTDB_INIT_CMD_GET_DENOMINATION(_label, _label_source) \
{ \
  .command = PERF_TALER_MINTDB_CMD_GET_DENOMINATION, \
  .label = _label, \
  .exposed.type = PERF_TALER_MINTDB_NONE, \
  .details.get_denomination.label_source = _label_source, \
}

/**
 * Creates a new reserve in the database
 */
#define PERF_TALER_MINTDB_INIT_CMD_INSERT_RESERVE(_label) \
{ \
  .command = PERF_TALER_MINTDB_CMD_INSERT_RESERVE, \
  .label = _label, \
  .exposed.type = PERF_TALER_MINTDB_RESERVE \
}


/**
 * Polls the database for a secific reserve's details
 * @param _label_source Source for the reserve to poll
 */
#define PERF_TALER_MINTDB_INIT_CMD_GET_RESERVE(_label, _label_source) \
{ \
  .command = PERF_TALER_MINTDB_CMD_GET_RESERVE, \
  .label = _label, \
  .exposed.type = PERF_TALER_MINTDB_NONE, \
  .details.get_reserve.label_source = _label_source \
}


/**
 * Insert a deposit into the database
 * @param _label_dki source to use for the denomination key
 */
#define PERF_TALER_MINTDB_INIT_CMD_INSERT_DEPOSIT(_label, _label_dki) \
{ \
  .command = PERF_TALER_MINTDB_CMD_INSERT_DEPOSIT,\
  .label = _label, \
  .exposed.type = PERF_TALER_MINTDB_DEPOSIT, \
  .details.insert_deposit.label_dki = _label_dki, \
}


/**
 * Check if a deposit is in the database
 * @param _label_deposit Label of the deposit to use
 */
#define PERF_TALER_MINTDB_INIT_CMD_GET_DEPOSIT(_label, _label_deposit) \
{ \
  .command = PERF_TALER_MINTDB_CMD_GET_DEPOSIT, \
  .label = _label, \
  .exposed.type = PERF_TALER_MINTDB_NONE, \
  .details.get_deposit.label_source = _label_deposit \
}


/**
 * Inserts informations about a withdrawal in the database
 * @param _label_dki denomination key used to sign the coin
 * @param _label_reserve reserve used to emmit the coin
 */
#define PERF_TALER_MINTDB_INIT_CMD_INSERT_WITHDRAW(_label, _label_dki, _label_reserve) \
{ \
  .command = PERF_TALER_MINTDB_CMD_INSERT_WITHDRAW, \
  .label = _label, \
  .exposed.type = PERF_TALER_MINTDB_BLINDCOIN, \
  .details.insert_withdraw = {\
    .label_dki = _label_dki, \
    .label_reserve = _label_reserve, \
  } \
}


/**
 * Polls the database about informations regarding a specific withdrawal
 */
#define PERF_TALER_MINTDB_INIT_CMD_GET_WITHDRAW(_label, _label_source) \
{ \
  .command = PERF_TALER_MINTDB_CMD_GET_WITHDRAW, \
  .label = _label, \
  .exposed.type = PERF_TALER_MINTDB_NONE, \
  .details.get_withdraw.label_source = _label_source, \
}


/**
 * The type of data stored
 * in a PERF_TALER_MINTDB_Type
 */
enum PERF_TALER_MINTDB_Type
{
  PERF_TALER_MINTDB_NONE,
  PERF_TALER_MINTDB_TIME,
  PERF_TALER_MINTDB_DEPOSIT,
  PERF_TALER_MINTDB_BLINDCOIN,
  PERF_TALER_MINTDB_RESERVE,
  PERF_TALER_MINTDB_DENOMINATION_INFO,
  PERF_TALER_MINTDB_COIN_INFO
};


/**
 * Storage for a variety of data type
 */
union PERF_TALER_MINTDB_Memory
{
  struct timespec time;
  struct TALER_MINTDB_Deposit *deposit;
  struct TALER_MINTDB_CollectableBlindcoin *blindcoin;
  struct TALER_MINTDB_Reserve *reserve;
  struct TALER_MINTDB_DenominationKeyIssueInformation *dki;
  struct TALER_CoinPublicInfo *cpi;
};


/**
 *
 */
struct PERF_TALER_MINTDB_Data
{
  enum PERF_TALER_MINTDB_Type type;
  union PERF_TALER_MINTDB_Memory data; // inline def.
};


/**
 * Name of the command
 */
enum PERF_TALER_MINTDB_CMD_Name
{
  /**
   * All comand chain must hace this as their last command
   */
  PERF_TALER_MINTDB_CMD_END,

  /**
   * Prints it's label
   */
  PERF_TALER_MINTDB_CMD_DEBUG,

  // Define the start of al command chain loop
  PERF_TALER_MINTDB_CMD_LOOP,

  // Define the end of a command chain loop
  PERF_TALER_MINTDB_CMD_END_LOOP,

  // Save the time at which the command was executed
  PERF_TALER_MINTDB_CMD_GET_TIME,

  // Upload performance to Gauger
  PERF_TALER_MINTDB_CMD_GAUGER,

  // Start a new session
  PERF_TALER_MINTDB_CMD_NEW_SESSION,

  // Start a database transaction
  PERF_TALER_MINTDB_CMD_START_TRANSACTION,

  // End a database transaction
  PERF_TALER_MINTDB_CMD_COMMIT_TRANSACTION,

  // Abort a transaction
  PERF_TALER_MINTDB_CMD_ABORT_TRANSACTION,

  // Saves random deposits from a loop
  PERF_TALER_MINTDB_CMD_SAVE_ARRAY,

  // Load deposits saved earlier
  PERF_TALER_MINTDB_CMD_LOAD_ARRAY,

  // Insert a deposit into the database
  PERF_TALER_MINTDB_CMD_INSERT_DEPOSIT,

  // Check if a deposit is in the database
  PERF_TALER_MINTDB_CMD_GET_DEPOSIT,

  // Insert currency in a reserve / Create a reserve
  PERF_TALER_MINTDB_CMD_INSERT_RESERVE,

  // Get Informations about a reserve
  PERF_TALER_MINTDB_CMD_GET_RESERVE,

  // Insert informations about a withdrawal in the database
  PERF_TALER_MINTDB_CMD_INSERT_WITHDRAW,

  // Pulls informations about a withdrawal from the database
  PERF_TALER_MINTDB_CMD_GET_WITHDRAW,

  // Insert informations about a denomination key in the database
  PERF_TALER_MINTDB_CMD_INSERT_DENOMINATION,

  // Polls the database for informations about a specific denomination key
  PERF_TALER_MINTDB_CMD_GET_DENOMINATION,

  // Refresh a coin
  PERF_TALER_MINTDB_CMD_REFRESH_COIN
};


/**
 * Extra data requiered for the LOOP command
 */
struct PERF_TALER_MINTDB_CMD_loop_details
{
  // Maximum number of iteration in the loop
  const unsigned int max_iterations;
  unsigned int curr_iteration;
};


/**
 * Extra data requiered by the #PERF_TALER_MINTDB_CMD_END_LOOP command
 */
struct PERF_TALER_MINTDB_CMD_loop_end_details
{
  /**
   * Label of the loop closed by the command
   */
  const char *label_loop;
};


/**
 * Details about the Gauger command
 */
struct PERF_TALER_MINTDB_CMD_gauger_details
{
  /**
   * Label of the starting timestamp
   */
  const char *label_start;

  /**
   * Label of the ending timestamp
   */
  const char *label_stop;

  /**
   * Description of the metric, used in Gauger
   */
  const char *description;

  /**
   * Constant the result needs to be divided by
   * to get the result per unit
   */
  float divide;
};


/**
 * Contains extra data requiered by the SAVE_ARRAY command
 */
struct PERF_TALER_MINTDB_CMD_save_array_details
{
  /**
   * Number of items to save
   */
  unsigned int nb_saved;
  /**
   * Number of items already saved
   */
  unsigned int index;
  /**
   * Label of the loop it is attached to
   */
  const char *label_loop;
  /**
   * Label of the command exposing the item
   */
  const char *label_save;
  /**
   * Array of data saved
   */
  struct PERF_TALER_MINTDB_Data *data_saved;
};


/**
 * Extra data required for the LOAD_ARRAY command
 */
struct PERF_TALER_MINTDB_CMD_load_array_details
{
  /**
   * The loop in which the command is located
   */
  const char *label_loop;

  /**
   * Label of the command where the items were saved
   */
  const char *label_save;

  /**
   * A permutation array used to randomize the order the items are loaded in
   */
  unsigned int *permutation; // A permutation array to randomize the order the deposits are loaded in
};


/**
 * Data used by the command insert_deposit
 */
struct PERF_TALER_MINTDB_CMD_insert_deposit_details
{
  /**
   * Label of the source where the reserve used to create the coin is
   */
  const char *label_dki;
};


/**
 * Extra data requiered for the GET_DEPOSIT command
 */
struct PERF_TALER_MINTDB_CMD_get_deposit_details
{
  /**
   * The label of the source of the deposit to check
   */
  const char *label_source;
};


/**
 * Extra data requiered for the GET_DEPOSIT command
 */
struct PERF_TALER_MINTDB_CMD_get_reserve_details
{
  /**
   * The label of the source of the reserve to check
   */
  const char *label_source;
};


struct PERF_TALER_MINTDB_CMD_get_denomination_details
{
  /**
   * The label of the source of the denomination to check
   */
  const char *label_source;
};


/**
 * Extra data related to the get withdraw command
 */
struct PERF_TALER_MINTDB_CMD_insert_withdraw_details
{
  /**
   * label of the denomination key used to sign the coin
   */
  const char *label_dki;

  /**
   * label of the reserve the money to mint the coin comes from
   */
  const char *label_reserve;
};

/**
 * Extra data requiered for refreshing coins
 */
struct PERF_TALER_MINTDB_CMD_refresh_coin_details
{
  /**
   * The label of the coin to refresh
   */
  const char *label_source;
};


/**
 * Contains extra data required for any command
 */
union PERF_TALER_MINTDB_CMD_Details
{
  struct PERF_TALER_MINTDB_CMD_loop_details loop;
  struct PERF_TALER_MINTDB_CMD_loop_end_details end_loop;
  struct PERF_TALER_MINTDB_CMD_gauger_details gauger;
  struct PERF_TALER_MINTDB_CMD_save_array_details save_array;
  struct PERF_TALER_MINTDB_CMD_load_array_details load_array;
  struct PERF_TALER_MINTDB_CMD_insert_deposit_details insert_deposit;
  struct PERF_TALER_MINTDB_CMD_get_deposit_details get_deposit;
  struct PERF_TALER_MINTDB_CMD_get_reserve_details get_reserve;
  struct PERF_TALER_MINTDB_CMD_get_denomination_details get_denomination;
  struct PERF_TALER_MINTDB_CMD_refresh_coin_details refresh;
  struct PERF_TALER_MINTDB_CMD_insert_withdraw_details insert_withdraw;
};


/**
 * Command to be interpreted.
 */
struct PERF_TALER_MINTDB_Cmd
{
  /**
   *  Type of the command
   */
  enum PERF_TALER_MINTDB_CMD_Name command;

  /**
   * Label to refer to the command
   */
  const char *label;

  /**
   * Command specific data
   */
  union PERF_TALER_MINTDB_CMD_Details details;

  /**
   * Data easily accessible
   */
  struct PERF_TALER_MINTDB_Data exposed;
};


/**
 * Runs the command array @a cmd
 * using @a db_plugin to connect to the database
 */
int
PERF_TALER_MINTDB_interpret(
  struct TALER_MINTDB_Plugin *db_plugin,
  struct PERF_TALER_MINTDB_Cmd cmd[]);

#endif