/**
 * 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 <memory>
#include <utility>

#include "LuaProcessSession.h"

namespace org::apache::nifi::minifi::extensions::lua {

LuaProcessSession::LuaProcessSession(core::ProcessSession& session)
    : session_(session) {
}

std::shared_ptr<LuaScriptFlowFile> LuaProcessSession::get() {
  auto flow_file = session_.get();

  if (flow_file == nullptr) {
    return nullptr;
  }

  auto result = std::make_shared<LuaScriptFlowFile>(flow_file);
  flow_files_.push_back(result);

  return result;
}

void LuaProcessSession::transfer(const std::shared_ptr<LuaScriptFlowFile>& script_flow_file,
                                 const core::Relationship& relationship) {
  const auto flow_file = script_flow_file->getFlowFile();

  if (!flow_file) {
    throw std::runtime_error("Access of FlowFile after it has been released");
  }

  session_.transfer(flow_file, relationship);
}

void LuaProcessSession::read(const std::shared_ptr<LuaScriptFlowFile> &script_flow_file,
                             sol::table input_stream_callback) {
  const auto flow_file = script_flow_file->getFlowFile();

  if (!flow_file) {
    throw std::runtime_error("Access of FlowFile after it has been released");
  }

  session_.read(flow_file, [&input_stream_callback](const std::shared_ptr<io::InputStream>& input_stream) -> int64_t {
    sol::function callback = input_stream_callback["process"];
    return callback(input_stream_callback, std::make_shared<LuaInputStream>(input_stream));
  });
}

void LuaProcessSession::write(const std::shared_ptr<LuaScriptFlowFile> &script_flow_file,
                              sol::table output_stream_callback) {
  auto flow_file = script_flow_file->getFlowFile();

  if (!flow_file) {
    throw std::runtime_error("Access of FlowFile after it has been released");
  }

  session_.write(flow_file, [&output_stream_callback](const std::shared_ptr<io::OutputStream>& output_stream) -> int64_t {
    sol::function callback = output_stream_callback["process"];
    return callback(output_stream_callback, std::make_shared<LuaOutputStream>(output_stream));
  });
}

std::shared_ptr<LuaScriptFlowFile> LuaProcessSession::create() {
  auto result = std::make_shared<LuaScriptFlowFile>(session_.create());
  flow_files_.push_back(result);
  return result;
}

std::shared_ptr<LuaScriptFlowFile> LuaProcessSession::create(const std::shared_ptr<LuaScriptFlowFile> &flow_file) {
  std::shared_ptr<LuaScriptFlowFile> result;

  if (flow_file == nullptr) {
    result = std::make_shared<LuaScriptFlowFile>(session_.create());
  } else {
    result = std::make_shared<LuaScriptFlowFile>(session_.create(flow_file->getFlowFile().get()));
  }

  flow_files_.push_back(result);
  return result;
}

void LuaProcessSession::releaseCoreResources() {
  for (const auto &flow_file : flow_files_) {
    if (flow_file) {
      flow_file->releaseFlowFile();
    }
  }
}

void LuaProcessSession::remove(const std::shared_ptr<LuaScriptFlowFile>& script_flow_file) {
  auto flow_file = script_flow_file->getFlowFile();

  if (!flow_file) {
    throw std::runtime_error("Access of FlowFile after it has been released");
  }

  session_.remove(flow_file);
}

}  // namespace org::apache::nifi::minifi::extensions::lua