/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

#include "manager/ckptmgr-client.h"
#include <iostream>
#include <string>
#include "errors/errors.h"
#include "threads/threads.h"

namespace heron {
namespace tmaster {

CkptMgrClient::CkptMgrClient(std::shared_ptr<EventLoop> eventLoop, const NetworkOptions& _options,
                            const sp_string& _topology_name, const sp_string& _topology_id,
                            std::function<void(proto::system::StatusCode)> _clean_response_watcher)
    : Client(eventLoop, _options),
      topology_name_(_topology_name),
      topology_id_(_topology_id),
      quit_(false),
      clean_response_watcher_(_clean_response_watcher) {

    // TODO(sanjeev): Take this from config
    reconnect_ckptmgr_interval_sec_ = 10;


    InstallResponseHandler(make_unique<proto::ckptmgr::RegisterTMasterRequest>(),
                           &CkptMgrClient::HandleTMasterRegisterResponse);
    InstallResponseHandler(make_unique<proto::ckptmgr::CleanStatefulCheckpointRequest>(),
                           &CkptMgrClient::HandleCleanStatefulCheckpointResponse);
}

CkptMgrClient::~CkptMgrClient() {
  Stop();
}

void CkptMgrClient::Quit() {
  quit_ = true;
  Stop();
}

void CkptMgrClient::HandleConnect(NetworkErrorCode _status) {
  if (_status == OK) {
    LOG(INFO) << "Connected to ckptmgr running at "
              << get_clientoptions().get_host() << ":" << get_clientoptions().get_port()
              << std::endl;
    if (quit_) {
      Stop();
    } else {
      SendRegisterRequest();
    }
  } else {
    LOG(WARNING) << "Could not connect to ckptmgr running at "
                 << get_clientoptions().get_host() << ":" << get_clientoptions().get_port()
                 << " due to: " << _status << std::endl;
    if (quit_) {
      LOG(ERROR) << "Quitting" << std::endl;
    } else {
      LOG(INFO) << "Retrying again..." << std::endl;
      AddTimer([this]() { this->OnReconnectTimer(); },
               reconnect_ckptmgr_interval_sec_ * 1000 * 1000);
    }
  }
}

void CkptMgrClient::HandleClose(NetworkErrorCode _status) {
  if (_status == OK) {
    LOG(INFO) << "Closed connection to ckptmgr running at "
              << get_clientoptions().get_host() << ":" << get_clientoptions().get_port()
              << std::endl;
  } else {
    LOG(INFO) << "Ckptmgr running at "
              << get_clientoptions().get_host() << ":" << get_clientoptions().get_port()
              << " closed connection with code: " << _status << std::endl;
  }
  if (quit_) {
    LOG(ERROR) << "Quitting" << std::endl;
  } else {
    LOG(INFO) << "Will try to reconnect again..." << std::endl;
    AddTimer([this]() { this->OnReconnectTimer(); },
             reconnect_ckptmgr_interval_sec_ * 1000 * 1000);
  }
}

void CkptMgrClient::HandleTMasterRegisterResponse(
                                void*,
                                pool_unique_ptr<proto::ckptmgr::RegisterTMasterResponse> _response,
                                NetworkErrorCode _status) {
  if (_status != OK) {
    LOG(ERROR) << "NonOK network code" << _status << " for register response from ckptmgr "
               << "running at " << get_clientoptions().get_host() << ":"
               << get_clientoptions().get_port() << std::endl;
    Stop();
    return;
  }

  proto::system::StatusCode status = _response->status().status();

  if (status != proto::system::OK) {
    LOG(ERROR) << "NonOK register response " << status << " from ckptmgr "
               << "running at " << get_clientoptions().get_host() << ":"
               << get_clientoptions().get_port() << std::endl;
    Stop();
  } else {
    LOG(INFO) << "Register request get response OK from ckptmgr "
              << "running at " << get_clientoptions().get_host() << ":"
              << get_clientoptions().get_port() << std::endl;
  }
}

void CkptMgrClient::OnReconnectTimer() { Start(); }

void CkptMgrClient::SendRegisterRequest() {
  LOG(INFO) << "Sending RegisterTmasterRequest to ckptmgr" << std::endl;
  auto request = make_unique<proto::ckptmgr::RegisterTMasterRequest>();
  request->set_topology_name(topology_name_);
  request->set_topology_id(topology_id_);
  SendRequest(std::move(request), nullptr);
}

void CkptMgrClient::SendCleanStatefulCheckpointRequest(const std::string& _oldest_ckpt,
                                                       bool _clean_all) {
  LOG(INFO) << "Sending CleanStatefulCheckpoint request to ckptmgr with oldest checkpoint "
            << _oldest_ckpt << " and clean_all " << _clean_all << std::endl;
  auto request = make_unique<proto::ckptmgr::CleanStatefulCheckpointRequest>();
  request->set_oldest_checkpoint_preserved(_oldest_ckpt);
  request->set_clean_all_checkpoints(_clean_all);
  SendRequest(std::move(request), nullptr);
}

void CkptMgrClient::HandleCleanStatefulCheckpointResponse(
                        void*,
                        pool_unique_ptr<proto::ckptmgr::CleanStatefulCheckpointResponse> _response,
                        NetworkErrorCode status) {
  LOG(INFO) << "Got CleanStatefulCheckpoint response from ckptmgr" << std::endl;

  proto::system::StatusCode code = proto::system::OK;

  if (status != OK) {
    code = proto::system::NOTOK;
  } else {
    code = _response->status().status();
  }

  clean_response_watcher_(code);
}

}  // namespace tmaster
}  // namespace heron