/* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   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, version 2.0, 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 */

#ifndef CONFIG_CHANGE_H
#define CONFIG_CHANGE_H

#include "SignalData.hpp"

struct ConfigChangeReq
{
  /**
   * Sender
   */
  friend class MgmtSrvr;

  /**
   * Receiver
   */
  friend class ConfigManager;

  STATIC_CONST( SignalLength = 1 );

  Uint32 length; // Length of the config data in long signal
};


struct ConfigChangeConf 
{
  /**
   * Sender
   */
  friend class ConfigManager;

  /**
   * Receiver
   */
  friend class MgmtSrvr;

  STATIC_CONST( SignalLength = 1 );

  Uint32 unused;
};


struct ConfigChangeRef 
{
  /**
   * Sender
   */
  friend class ConfigManager;

  /**
   * Receiver
   */
  friend class MgmtSrvr;


  enum ErrorCode {
    OK                      = 0,
    ConfigChangeOnGoing     = 1,
    NotMaster               = 2,
    NoConfigData            = 3,
    ConfigNotOk             = 4,
    InternalError           = 5,
    PrepareFailed           = 6,
    IllegalConfigChange     = 7,
    FailedToUnpack          = 8,
    InvalidGeneration       = 9,
    InvalidConfigName       = 10,
    IllegalInitialState     = 11,
    IllegalInitialGeneration = 12,
    DifferentInitial        = 13,
    NotAllStarted           = 14,
    NotPrimaryMgmNode       = 15,
    SendFailed              = 16
  };

  STATIC_CONST( SignalLength = 1 );

  static const char* errorMessage(Uint32 error) {
    switch (error){
    case ConfigChangeOnGoing:
      return "Config change ongoing";
    case NotMaster:
      return "Not the config change master";
    case NoConfigData:
      return "No config data in signal";
    case ConfigNotOk:
      return "Config is not ok";
    case InternalError:
      return "ConfigChangeRef, internal error";
    case PrepareFailed:
      return "Prepare of config change failed";
    case IllegalConfigChange:
      return "Illegal configuration change";
    case FailedToUnpack:
      return "Failed to unpack the configuration";
    case InvalidGeneration:
      return "Invalid generation in configuration";
    case InvalidConfigName:
      return "Invalid configuration name in configuration";
    case IllegalInitialState:
      return "Initial config change not allowed in this state";
    case IllegalInitialGeneration:
      return "Initial config change with generation not 0";
    case DifferentInitial:
      return "Different initial config files";
    case NotAllStarted:
      return " Not all mgm nodes are started";
    case NotPrimaryMgmNode:
      return "Not primary mgm node for configuration";
    case SendFailed:
      return "Failed to send signal to other node";

    default:
      return "ConfigChangeRef, unknown error";
    }
  }

  Uint32 errorCode;
};


struct ConfigChangeImplReq
{
  /**
   * Receiver and sender
   */
  friend class ConfigManager;

  enum RequestType {
    Prepare,
    Commit,
    Abort
  };

  STATIC_CONST( SignalLength = 3 );

  Uint32 requestType;
  Uint32 initial; // Valid when requestType = Prepare
  Uint32 length; // Length of the config data in long signal

};


struct ConfigChangeImplConf
{
  /**
   * Receiver and sender
   */
  friend class ConfigManager;

  STATIC_CONST( SignalLength = 1 );

  Uint32 requestType;
};


struct ConfigChangeImplRef
{
  /**
   * Receiver and sender
   */
  friend class ConfigManager;

  STATIC_CONST( SignalLength = 1 );

  Uint32 errorCode;
};


struct ConfigCheckReq
{
  /**
   * Sender
   */
  friend class MgmtSrvr;

  /**
   * Receiver
   */
  friend class ConfigManager;

  STATIC_CONST( SignalLengthBeforeChecksum = 2 );
  STATIC_CONST( SignalLength = 3 );

  Uint32 state;
  Uint32 generation;
  Uint32 checksum;
};


struct ConfigCheckConf
{
  /**
   * Sender
   */
  friend class ConfigManager;

  /**
   * Receiver
   */
  friend class MgmtSrvr;

  STATIC_CONST( SignalLength = 2 );

  Uint32 state;
  Uint32 generation;
};


struct ConfigCheckRef
{
  /**
   * Sender
   */
  friend class ConfigManager;

  /**
   * Receiver
   */
  friend class MgmtSrvr;

  enum ErrorCode {
    WrongState                 = 1,
    WrongGeneration            = 2,
    WrongChecksum              = 3
  };

  static const char* errorMessage(Uint32 error) {
    switch (error){
    case WrongState:
      return "Wrong state";
    case WrongGeneration:
      return "Wrong generation";
    case WrongChecksum:
      return "Wrong checksum";

    default:
      return "ConfigCheckRef, unknown error";
    }
  }

  STATIC_CONST( SignalLength = 5 );
  STATIC_CONST( SignalLengthWithConfig = 6 );

  Uint32 error;
  Uint32 generation;
  Uint32 expected_generation;
  Uint32 state;
  Uint32 expected_state;
  Uint32 length; // Length of the config data in long signal
};

#endif
