/* Copyright (c) 2014, 2021, Oracle and/or its affiliates.

   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 St, Fifth Floor, Boston, MA 02110-1301  USA */

#include "rpl_msr.h"

#include "rpl_rli.h"     // Relay_log_info

const char* Multisource_info::default_channel= "";
const char* Multisource_info::group_replication_channel_names[] = {
  "group_replication_applier",
  "group_replication_recovery"
};

bool Multisource_info::add_mi(const char* channel_name, Master_info* mi)
{
  DBUG_ENTER("Multisource_info::add_mi");

  m_channel_map_lock->assert_some_wrlock();

  mi_map::const_iterator it;
  std::pair<mi_map::iterator, bool>  ret;
  bool res= false;

  /* The check of mi exceeding MAX_CHANNELS shall be done in the caller */
  assert(current_mi_count < MAX_CHANNELS);

  replication_channel_map::iterator map_it;
  enum_channel_type type= is_group_replication_channel_name(channel_name)
    ? GROUP_REPLICATION_CHANNEL: SLAVE_REPLICATION_CHANNEL;

  map_it= rep_channel_map.find(type);

  if (map_it == rep_channel_map.end())
  {
    std::pair<replication_channel_map::iterator, bool> map_ret =
      rep_channel_map.insert(replication_channel_map::value_type(type, mi_map()));

    if (!map_ret.second)
      DBUG_RETURN(true);

    map_it = rep_channel_map.find(type);
  }

  ret = map_it->second.insert(mi_map::value_type(channel_name, mi));

  /* If a map insert fails, ret.second is false */
  if(!ret.second)
    DBUG_RETURN(true);

  /* Save the pointer for the default_channel to avoid searching it */
  if (!strcmp(channel_name, get_default_channel()))
    default_channel_mi= mi;

#ifdef WITH_PERFSCHEMA_STORAGE_ENGINE
  res= add_mi_to_rpl_pfs_mi(mi);
#endif
  current_mi_count++;

  DBUG_RETURN(res);

}

Master_info* Multisource_info::get_mi(const char* channel_name)
{
  DBUG_ENTER("Multisource_info::get_mi");

  m_channel_map_lock->assert_some_lock();

  assert(channel_name != 0);

  mi_map::iterator it;
  replication_channel_map::iterator map_it;

  map_it= rep_channel_map.find(SLAVE_REPLICATION_CHANNEL);
  if (map_it != rep_channel_map.end())
  {
    it= map_it->second.find(channel_name);
  }

  if (map_it == rep_channel_map.end() || //If not a slave channel, maybe a group one
      it == map_it->second.end())
  {
    map_it= rep_channel_map.find(GROUP_REPLICATION_CHANNEL);
    if (map_it == rep_channel_map.end())
    {
      DBUG_RETURN(0);
    }
    it= map_it->second.find(channel_name);
    if (it == map_it->second.end())
    {
      DBUG_RETURN(0);
    }
  }

  DBUG_RETURN(it->second);
}

bool Multisource_info::delete_mi(const char* channel_name)
{
  DBUG_ENTER("Multisource_info::delete_mi");

  m_channel_map_lock->assert_some_wrlock();

  Master_info *mi= 0;
  mi_map::iterator it;

  assert(channel_name != 0);

  replication_channel_map::iterator map_it;
  map_it= rep_channel_map.find(SLAVE_REPLICATION_CHANNEL);

  if (map_it != rep_channel_map.end())
  {
    it= map_it->second.find(channel_name);
  }
  if (map_it == rep_channel_map.end() || //If not a slave channel, maybe a group one
      it == map_it->second.end())
  {
    map_it= rep_channel_map.find(GROUP_REPLICATION_CHANNEL);
    assert(map_it != rep_channel_map.end());

    if (map_it != rep_channel_map.end())
    {
      it = map_it->second.find(channel_name);
      assert(it != map_it->second.end());
    }
  }

  if (map_it == rep_channel_map.end() || it == map_it->second.end())
  {
    // the channel identified by channel_name could not be found
    DBUG_RETURN(true);
  }

#ifdef WITH_PERFSCHEMA_STORAGE_ENGINE
  int index= -1;
  /* get the index of mi from rpl_pfs_mi */
  index= get_index_from_rpl_pfs_mi(channel_name);

  assert(index != -1);

  /* set the current index to  0  and decrease current_mi_count */
  rpl_pfs_mi[index] = 0;
#endif

  current_mi_count--;

  mi= it->second;
  it->second= 0;
  /* erase from the map */
  map_it->second.erase(it);

  if (default_channel_mi == mi)
    default_channel_mi= NULL;

  /* delete the master info */
  if (mi)
  {
    mi->channel_assert_some_wrlock();
    mi->wait_until_no_reference(current_thd);

    if(mi->rli)
    {
      delete mi->rli;
    }
    delete mi;
  }

  DBUG_RETURN(false);
}


bool Multisource_info::is_group_replication_channel_name(const char* channel,
                                                         bool is_applier)
{
  if (is_applier)
    return !strcmp(channel, group_replication_channel_names[0]);
  else
    return !strcmp(channel, group_replication_channel_names[0]) ||
           !strcmp(channel, group_replication_channel_names[1]);
}


#ifdef WITH_PERFSCHEMA_STORAGE_ENGINE

bool Multisource_info::add_mi_to_rpl_pfs_mi(Master_info *mi)
{
  DBUG_ENTER("Multisource_info::add_mi_to_rpl_pfs_mi");

  m_channel_map_lock->assert_some_wrlock();

  bool res=true; // not added

  /* Point to this added mi in the rpl_pfs_mi*/
  for (uint i = 0; i < MAX_CHANNELS; i++)
  {
    if (rpl_pfs_mi[i] == 0)
    {
      rpl_pfs_mi[i] = mi;
      res= false;  // success
      break;
    }
  }
  DBUG_RETURN(res);
}


int Multisource_info::get_index_from_rpl_pfs_mi(const char * channel_name)
{
  m_channel_map_lock->assert_some_lock();

  Master_info* mi= 0;
  for (uint i= 0; i < MAX_CHANNELS; i++)
  {
    mi= rpl_pfs_mi[i];
    if (mi)
    {
      if ( !strcmp(mi->get_channel(), channel_name))
        return i;
    }
  }
  return -1;
}


Master_info*  Multisource_info::get_mi_at_pos(uint pos)
{
  DBUG_ENTER("Multisource_info::get_mi_at_pos");

  m_channel_map_lock->assert_some_lock();

  if ( pos < MAX_CHANNELS)
    DBUG_RETURN(rpl_pfs_mi[pos]);

  DBUG_RETURN(0);
}
#endif /*WITH_PERFSCHEMA_STORAGE_ENGINE */

/* There is only one channel_map for the whole server */
Multisource_info channel_map;
