/*
  Copyright (c) 2014, 2016, 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 St, Fifth Floor, Boston, MA 02110-1301  USA */

/**
  @file storage/perfschema/table_replication_group_member_stats.cc
  Table replication_group_member_stats (implementation).
*/

//#define HAVE_REPLICATION

#include "my_global.h"
#include "table_replication_group_member_stats.h"
#include "pfs_instr_class.h"
#include "pfs_instr.h"
#include "log.h"
#include "rpl_group_replication.h"

/*
  Callbacks implementation for GROUP_REPLICATION_GROUP_MEMBER_STATS_CALLBACKS.
*/
static void set_channel_name(void* const context, const char& value,
                             size_t length)
{
  struct st_row_group_member_stats* row=
      static_cast<struct st_row_group_member_stats*>(context);
  const size_t max= CHANNEL_NAME_LENGTH;
  length= std::min(length, max);

  row->channel_name_length= length;
  memcpy(row->channel_name, &value, length);
}

static void set_view_id(void* const context, const char& value, size_t length)
{
  struct st_row_group_member_stats* row=
      static_cast<struct st_row_group_member_stats*>(context);
  const size_t max= HOSTNAME_LENGTH;
  length= std::min(length, max);

  row->view_id_length= length;
  memcpy(row->view_id, &value, length);
}

static void set_member_id(void* const context, const char& value, size_t length)
{
  struct st_row_group_member_stats* row=
      static_cast<struct st_row_group_member_stats*>(context);
  const size_t max= UUID_LENGTH;
  length= std::min(length, max);

  row->member_id_length= length;
  memcpy(row->member_id, &value, length);
}

static void set_transactions_committed(void* const context, const char& value,
                                       size_t length)
{
  struct st_row_group_member_stats* row=
      static_cast<struct st_row_group_member_stats*>(context);

  if (row->trx_committed != NULL)
    my_free(row->trx_committed);

  row->trx_committed_length= length;
  row->trx_committed= (char*) my_malloc(PSI_NOT_INSTRUMENTED,
                                        length,
                                        MYF(0));
  memcpy(row->trx_committed, &value, length);
}

static void set_last_conflict_free_transaction(void* const context,
                                               const char& value, size_t length)
{
  struct st_row_group_member_stats* row=
      static_cast<struct st_row_group_member_stats*>(context);
  const size_t max= Gtid::MAX_TEXT_LENGTH+1;
  length= std::min(length, max);

  row->last_cert_trx_length= length;
  memcpy(row->last_cert_trx, &value, length);
}

static void set_transactions_in_queue(void* const context,
                                      unsigned long long int value)
{
  struct st_row_group_member_stats* row=
      static_cast<struct st_row_group_member_stats*>(context);
  row->trx_in_queue= value;
}

static void set_transactions_certified(void* const context,
                                       unsigned long long int value)
{
  struct st_row_group_member_stats* row=
      static_cast<struct st_row_group_member_stats*>(context);
  row->trx_checked= value;
}

static void set_transactions_conflicts_detected(void* const context,
                                                unsigned long long int value)
{
  struct st_row_group_member_stats* row=
      static_cast<struct st_row_group_member_stats*>(context);
  row->trx_conflicts= value;
}

static void set_transactions_rows_in_validation(void* const context,
                                                unsigned long long int value)
{
  struct st_row_group_member_stats* row=
      static_cast<struct st_row_group_member_stats*>(context);
  row->trx_rows_validating= value;
}


THR_LOCK table_replication_group_member_stats::m_table_lock;

static const TABLE_FIELD_TYPE field_types[]=
{
  {
    {C_STRING_WITH_LEN("CHANNEL_NAME")},
    {C_STRING_WITH_LEN("char(64)")},
    {NULL, 0}
  },
  {
    {C_STRING_WITH_LEN("VIEW_ID")},
    {C_STRING_WITH_LEN("char(60)")},
    {NULL, 0}
  },
  {
    {C_STRING_WITH_LEN("MEMBER_ID")},
    {C_STRING_WITH_LEN("char(36)")},
    {NULL, 0}
  },
  {
    {C_STRING_WITH_LEN("COUNT_TRANSACTIONS_IN_QUEUE")},
    {C_STRING_WITH_LEN("bigint")},
    {NULL, 0}
  },
  {
    {C_STRING_WITH_LEN("COUNT_TRANSACTIONS_CHECKED")},
    {C_STRING_WITH_LEN("bigint")},
    {NULL, 0}
  },
  {
    {C_STRING_WITH_LEN("COUNT_CONFLICTS_DETECTED")},
    {C_STRING_WITH_LEN("bigint")},
    {NULL, 0}
  },
  {
    {C_STRING_WITH_LEN("COUNT_TRANSACTIONS_ROWS_VALIDATING")},
    {C_STRING_WITH_LEN("bigint")},
    {NULL, 0}
  },
  {
    {C_STRING_WITH_LEN("TRANSACTIONS_COMMITTED_ALL_MEMBERS")},
    {C_STRING_WITH_LEN("longtext")},
    {NULL, 0}
  },
  {
    {C_STRING_WITH_LEN("LAST_CONFLICT_FREE_TRANSACTION")},
    {C_STRING_WITH_LEN("text")},
    {NULL, 0}
  }
};

TABLE_FIELD_DEF
table_replication_group_member_stats::m_field_def=
{ 9, field_types };

PFS_engine_table_share
table_replication_group_member_stats::m_share=
{
  { C_STRING_WITH_LEN("replication_group_member_stats") },
  &pfs_readonly_acl,
  &table_replication_group_member_stats::create,
  NULL, /* write_row */
  NULL, /* delete_all_rows */
  table_replication_group_member_stats::get_row_count,
  sizeof(PFS_simple_index), /* ref length */
  &m_table_lock,
  &m_field_def,
  false, /* checked */
  false  /* perpetual */
};

PFS_engine_table* table_replication_group_member_stats::create(void)
{
  return new table_replication_group_member_stats();
}

table_replication_group_member_stats::table_replication_group_member_stats()
  : PFS_engine_table(&m_share, &m_pos),
    m_row_exists(false), m_pos(0), m_next_pos(0)
{
  m_row.trx_committed= NULL;
}

table_replication_group_member_stats::~table_replication_group_member_stats()
{
  if (m_row.trx_committed != NULL)
  {
    my_free(m_row.trx_committed);
    m_row.trx_committed= NULL;
  }
}

void table_replication_group_member_stats::reset_position(void)
{
  m_pos.m_index= 0;
  m_next_pos.m_index= 0;
}

ha_rows table_replication_group_member_stats::get_row_count()
{
  uint row_count= 0;

  if (is_group_replication_plugin_loaded())
    row_count= 1;

  return row_count;
}

int table_replication_group_member_stats::rnd_next(void)
{
  if (!is_group_replication_plugin_loaded())
    return HA_ERR_END_OF_FILE;

  m_pos.set_at(&m_next_pos);
  if (m_pos.m_index == 0)
  {
    make_row();
    m_next_pos.set_after(&m_pos);
    return 0;
  }

  return HA_ERR_END_OF_FILE;
}

int table_replication_group_member_stats::rnd_pos(const void *pos)
{
  if (get_row_count() == 0)
    return HA_ERR_END_OF_FILE;

  set_position(pos);
  DBUG_ASSERT(m_pos.m_index < 1);
  make_row();

  return 0;
}

void table_replication_group_member_stats::make_row()
{
  DBUG_ENTER("table_replication_group_member_stats::make_row");
  // Set default values.
  m_row_exists= false;
  m_row.channel_name_length= 0;
  m_row.view_id_length= 0;
  m_row.member_id_length= 0;
  m_row.trx_committed_length= 0;
  m_row.last_cert_trx_length= 0;
  m_row.trx_in_queue= 0;
  m_row.trx_checked= 0;
  m_row.trx_conflicts= 0;
  m_row.trx_rows_validating= 0;

  // Set callbacks on GROUP_REPLICATION_GROUP_MEMBER_STATS_CALLBACKS.
  const GROUP_REPLICATION_GROUP_MEMBER_STATS_CALLBACKS callbacks=
  {
    &m_row,
    &set_channel_name,
    &set_view_id,
    &set_member_id,
    &set_transactions_committed,
    &set_last_conflict_free_transaction,
    &set_transactions_in_queue,
    &set_transactions_certified,
    &set_transactions_conflicts_detected,
    &set_transactions_rows_in_validation,
  };

  // Query plugin and let callbacks do their job.
  if (get_group_replication_group_member_stats_info(callbacks))
  {
    DBUG_PRINT("info", ("Group Replication stats not available!"));
  }
  else
  {
    m_row_exists= true;
  }

  DBUG_VOID_RETURN;
}


int table_replication_group_member_stats::read_row_values(TABLE *table,
                                                   unsigned char *buf,
                                                   Field **fields,
                                                   bool read_all)
{
  Field *f;

  if (unlikely(! m_row_exists))
    return HA_ERR_RECORD_DELETED;

  DBUG_ASSERT(table->s->null_bytes == 0);
  buf[0]= 0;

  for (; (f= *fields) ; fields++)
  {
    if (read_all || bitmap_is_set(table->read_set, f->field_index))
    {
      switch(f->field_index)
      {
      case 0: /** channel_name */
        set_field_char_utf8(f, m_row.channel_name,
                               m_row.channel_name_length);
        break;
      case 1: /** view id */
        set_field_char_utf8(f, m_row.view_id, m_row.view_id_length);
        break;
      case 2: /** member_id */
        set_field_char_utf8(f, m_row.member_id, m_row.member_id_length);
        break;
      case 3: /** transaction_in_queue */
        set_field_ulonglong(f, m_row.trx_in_queue);
        break;
      case 4: /** transactions_certified */
        set_field_ulonglong(f, m_row.trx_checked);
        break;
      case 5: /** negatively_certified_transaction */
        set_field_ulonglong(f, m_row.trx_conflicts);
        break;
      case 6: /** certification_db_size */
        set_field_ulonglong(f, m_row.trx_rows_validating);
        break;
      case 7: /** stable_set */
        set_field_longtext_utf8(f, m_row.trx_committed,
                                m_row.trx_committed_length);
        break;
      case 8: /** last_certified_transaction */
        set_field_longtext_utf8(f, m_row.last_cert_trx,
                                m_row.last_cert_trx_length);

        break;
      default:
        DBUG_ASSERT(false);
      }
    }
  }
  return 0;
}