////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
/// Copyright 2004-2013 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
////////////////////////////////////////////////////////////////////////////////

#ifndef ARANGODB_LOGGER_LOGGER_STREAM_H
#define ARANGODB_LOGGER_LOGGER_STREAM_H 1

#include "Basics/Common.h"

#include <sstream>

namespace arangodb {
class LoggerStream {
  LoggerStream(LoggerStream const&) = delete;
  LoggerStream& operator=(LoggerStream const&) = delete;

 public:
  LoggerStream()
      : _topicId(LogTopic::MAX_LOG_TOPICS),
        _level(LogLevel::DEFAULT),
        _line(0),
        _file(nullptr),
        _function(nullptr) {}

  ~LoggerStream();

 public:
  LoggerStream& operator<<(LogLevel level) {
    _level = level;
    return *this;
  }

  LoggerStream& operator<<(LogTopic topic) {
    _topicId = topic.id();
    _out << "{" + topic.name() << "} ";
    return *this;
  }

  LoggerStream& operator<<(Logger::RANGE range);

  LoggerStream& operator<<(Logger::FIXED duration);

  LoggerStream& operator<<(Logger::LINE line) {
    _line = line._line;
    return *this;
  }

  LoggerStream& operator<<(Logger::FILE file) {
    _file = file._file;
    return *this;
  }

  LoggerStream& operator<<(Logger::FUNCTION function) {
    _function = function._function;
    return *this;
  }

  template <typename T>
  LoggerStream& operator<<(T const& obj) {
    _out << obj;
    return *this;
  }

  template <typename T>
  LoggerStream& operator<<(std::vector<T> const& obj) {
    _out << '[';
    size_t i = 0;
    size_t const n = obj.size();
    for (auto const& it : obj) {
      if (++i < n) {
        _out << it << ", ";
      }
    }
    _out << ']';
    return *this;
  }

  template <typename T>
  LoggerStream& operator<<(std::unordered_set<T> const& obj) {
    _out << '{';
    size_t i = 0;
    size_t const n = obj.size();
    for (auto const& it : obj) {
      if (++i < n) {
        _out << it << ", ";
      }
    }
    _out << '}';
    return *this;
  }
  
  template <typename K, typename V>
  LoggerStream& operator<<(std::unordered_map<K, V> const& obj) {
    _out << '{';
    size_t i = 0;
    size_t n = obj.size();
    for (auto const& it : obj) {
      if (++i < n) {
        _out << it << ", ";
      }
      _out << it.first << " => " << it.second;
    }
    _out << '}';
    return *this;
  }

 private:
  std::stringstream _out;
  size_t _topicId;
  LogLevel _level;
  long int _line;
  char const* _file;
  char const* _function;
};
}

#endif