/* Copyright 2018-2022 Codership Oy <info@codership.com>

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

#include "my_global.h"
#include "wsrep_api.h"
#include "wsrep_server_state.h"
#include "wsrep_allowlist_service.h"
#include "wsrep_event_service.h"
#include "wsrep_binlog.h" /* init/deinit group commit */
#include "wsrep_plugin.h" /* make/destroy sysvar helpers */

mysql_mutex_t LOCK_wsrep_server_state;
mysql_cond_t  COND_wsrep_server_state;

#ifdef HAVE_PSI_INTERFACE
PSI_mutex_key key_LOCK_wsrep_server_state;
PSI_cond_key  key_COND_wsrep_server_state;
#endif

wsrep::provider::services Wsrep_server_state::m_provider_services;

Wsrep_server_state* Wsrep_server_state::m_instance;
std::unique_ptr<wsrep::provider_options> Wsrep_server_state::m_options;
std::vector<st_mysql_sys_var*> Wsrep_server_state::m_sysvars;

Wsrep_server_state::Wsrep_server_state(const std::string& name,
                                       const std::string& incoming_address,
                                       const std::string& address,
                                       const std::string& working_dir,
                                       const wsrep::gtid& initial_position,
                                       int max_protocol_version)
  : wsrep::server_state(m_mutex,
                        m_cond,
                        m_service,
                        NULL,
                        name,
                        incoming_address,
                        address,
                        working_dir,
                        initial_position,
                        max_protocol_version,
                        wsrep::server_state::rm_sync)
  , m_mutex(&LOCK_wsrep_server_state)
  , m_cond(&COND_wsrep_server_state)
  , m_service(*this)
{ }

Wsrep_server_state::~Wsrep_server_state() = default;

void Wsrep_server_state::init_once(const std::string& name,
                                   const std::string& incoming_address,
                                   const std::string& address,
                                   const std::string& working_dir,
                                   const wsrep::gtid& initial_position,
                                   int max_protocol_version)
{
  if (m_instance == 0)
  {
    mysql_mutex_init(key_LOCK_wsrep_server_state, &LOCK_wsrep_server_state,
                     MY_MUTEX_INIT_FAST);
    mysql_cond_init(key_COND_wsrep_server_state, &COND_wsrep_server_state, 0);
    m_instance = new Wsrep_server_state(name,
                                        incoming_address,
                                        address,
                                        working_dir,
                                        initial_position,
                                        max_protocol_version);
  }
}

int Wsrep_server_state::init_provider(const std::string& provider,
                                      const std::string& options)
{
  DBUG_ASSERT(m_instance);
  int ret= m_instance->load_provider(provider, options);
  if (ret)
  {
    WSREP_ERROR("Failed to load provider %s with options %s",
                provider.c_str(), options.c_str());
    return ret;
  }
  return 0;
}

int Wsrep_server_state::init_options()
{
  if (!m_instance) return 1;
  m_options= std::unique_ptr<wsrep::provider_options>(
     new wsrep::provider_options(m_instance->provider()));
  int ret= m_options->initial_options();
  if (ret)
  {
    WSREP_ERROR("Failed to initialize provider options");
    m_options = nullptr;
    m_instance->unload_provider();
    return ret;
  }
  m_options->for_each([](wsrep::provider_options::option *opt) {
    struct st_mysql_sys_var *var= wsrep_make_sysvar_for_option(opt);
    m_sysvars.push_back(var);
  });
  m_sysvars.push_back(nullptr);
  wsrep_provider_plugin_set_sysvars(&m_sysvars[0]);
  return 0;
}

void Wsrep_server_state::deinit_provider()
{
  m_options = nullptr;
  m_instance->unload_provider();
}

void Wsrep_server_state::destroy()
{
  if (m_instance)
  {
    delete m_instance;
    m_instance= 0;
    mysql_mutex_destroy(&LOCK_wsrep_server_state);
    mysql_cond_destroy(&COND_wsrep_server_state);
    for (auto var : m_sysvars)
    {
      if (var)
      {
        wsrep_destroy_sysvar(var);
      }
    }
    m_sysvars.clear();
  }
}

void Wsrep_server_state::init_provider_services()
{
  m_provider_services.allowlist_service= wsrep_allowlist_service_init();
  m_provider_services.event_service= Wsrep_event_service::instance();
}

void Wsrep_server_state::deinit_provider_services()
{
  if (m_provider_services.allowlist_service)
    wsrep_allowlist_service_deinit();
  m_provider_services= wsrep::provider::services();
}