/*
  Copyright (c) 2015, 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 "client/dump/abstract_crawler.h"

#include <stddef.h>
#include <atomic>
#include <chrono>
#include <functional>
#include <thread>

#include "client/dump/dump_end_dump_task.h"

using namespace Mysql::Tools::Dump;

std::atomic<uint64_t> Abstract_crawler::next_chain_id;

Abstract_crawler::Abstract_crawler(
    std::function<bool(const Mysql::Tools::Base::Message_data &)>
        *message_handler,
    Simple_id_generator *object_id_generator,
    Mysql::Tools::Base::Abstract_program *program)
    : Abstract_chain_element(message_handler, object_id_generator),
      m_program(program) {}

Abstract_crawler::~Abstract_crawler() {
  for (std::vector<I_dump_task *>::iterator it = m_dump_tasks_created.begin();
       it != m_dump_tasks_created.end(); ++it) {
    delete *it;
  }
}

void Abstract_crawler::register_chain_maker(I_chain_maker *new_chain_maker) {
  m_chain_makers.push_back(new_chain_maker);
}

Mysql::Tools::Base::Abstract_program *Abstract_crawler::get_program() {
  return m_program;
}

void Abstract_crawler::process_dump_task(I_dump_task *new_dump_task) {
  /*
   Add the tasks to this list so that even if we error out,
   cleanup is done properly.
  */
  m_dump_tasks_created.push_back(new_dump_task);

  /* in case of error stop all further processing */
  if (get_program()->get_error_code()) return;

  Item_processing_data *main_item_processing_data =
      this->new_task_created(new_dump_task);

  this->object_processing_starts(main_item_processing_data);

  for (std::vector<I_chain_maker *>::iterator it = m_chain_makers.begin();
       it != m_chain_makers.end(); ++it) {
    uint64 new_chain_id = next_chain_id++;
    Chain_data *chain_data = new Chain_data(new_chain_id);

    I_object_reader *chain = (*it)->create_chain(chain_data, new_dump_task);
    if (chain != nullptr) {
      main_item_processing_data->set_chain(chain_data);
      chain->read_object(this->new_chain_created(
          chain_data, main_item_processing_data, chain));
    } else {
      delete chain_data;
    }
  }
  this->object_processing_ends(main_item_processing_data);
}

void Abstract_crawler::wait_for_tasks_completion() {
  for (std::vector<I_dump_task *>::iterator it = m_dump_tasks_created.begin();
       it != m_dump_tasks_created.end(); ++it) {
    while ((*it)->is_completed() == false) {
      /* in case of error stop all running queues */
      if (get_program()->get_error_code()) {
        for (const auto &chain_maker : m_chain_makers) {
          chain_maker->stop_queues();
        }
        return;
      }
      std::this_thread::sleep_for(std::chrono::milliseconds(1));
    }
  }
}

bool Abstract_crawler::need_callbacks_in_child() { return true; }
