////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
///     http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Dr. Frank Celler
/// @author Achim Brandt
////////////////////////////////////////////////////////////////////////////////

#include "TimerTask.h"
#include "Logger/Logger.h"
#include "Scheduler/Scheduler.h"

#include <velocypack/Builder.h>
#include <velocypack/velocypack-aliases.h>

using namespace arangodb::basics;
using namespace arangodb::rest;

// -----------------------------------------------------------------------------
// constructors and destructors
// -----------------------------------------------------------------------------

TimerTask::TimerTask(std::string const& id, double seconds)
    : Task(id, "TimerTask"), _watcher(nullptr), _seconds(seconds) {}

TimerTask::~TimerTask() { cleanup(); }

// -----------------------------------------------------------------------------
// Task methods
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @brief get a task specific description in VelocyPack format
////////////////////////////////////////////////////////////////////////////////

void TimerTask::getDescription(VPackBuilder& builder) const {
  builder.add("type", VPackValue("timed"));
  builder.add("offset", VPackValue(_seconds));
}

////////////////////////////////////////////////////////////////////////////////
/// @brief set up task
////////////////////////////////////////////////////////////////////////////////

bool TimerTask::setup(Scheduler* scheduler, EventLoop loop) {
  _scheduler = scheduler;
  _loop = loop;

  if (0.0 < _seconds) {
    _watcher = _scheduler->installTimerEvent(loop, this, _seconds);
    LOG(TRACE) << "armed TimerTask with " << _seconds << " seconds";
  } else {
    _watcher = nullptr;
  }

  return true;
}

void TimerTask::cleanup() {
  if (_scheduler != nullptr) {
    _scheduler->uninstallEvent(_watcher);
  }
  _watcher = nullptr;
}

bool TimerTask::handleEvent(EventToken token, EventType revents) {
  bool result = true;

  if (token == _watcher) {
    if (revents & EVENT_TIMER) {
      cleanup();
      result = handleTimeout();
    }
  }

  return result;
}