/*
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * 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.
 */

#include <folly/logging/StreamHandlerFactory.h>

#include <folly/Conv.h>
#include <folly/logging/FileWriterFactory.h>
#include <folly/logging/StandardLogHandler.h>
#include <folly/logging/StandardLogHandlerFactory.h>

namespace folly {

bool StreamHandlerFactory::WriterFactory::processOption(
    StringPiece name, StringPiece value) {
  if (name == "stream") {
    stream_ = value.str();
    return true;
  }
  return fileWriterFactory_.processOption(name, value);
}

std::shared_ptr<LogWriter> StreamHandlerFactory::WriterFactory::createWriter() {
  // Get the output file to use
  File outputFile;
  if (stream_.empty()) {
    throw std::invalid_argument("no stream name specified for stream handler");
  } else if (stream_ == "stderr") {
    outputFile = File{STDERR_FILENO, /* ownsFd */ false};
  } else if (stream_ == "stdout") {
    outputFile = File{STDOUT_FILENO, /* ownsFd */ false};
  } else {
    throw std::invalid_argument(to<std::string>(
        "unknown stream \"", stream_, "\": expected one of stdout or stderr"));
  }

  return fileWriterFactory_.createWriter(std::move(outputFile));
}

std::shared_ptr<LogHandler> StreamHandlerFactory::createHandler(
    const Options& options) {
  WriterFactory writerFactory;
  return StandardLogHandlerFactory::createHandler(
      getType(), &writerFactory, options);
}

} // namespace folly
