/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2013 University of Washington
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Mitch Watrous (watrous@u.washington.edu)
 */

#ifndef FILE_HELPER_H
#define FILE_HELPER_H

#include <map>
#include <string>
#include "ns3/object-factory.h"
#include "ns3/ptr.h"
#include "ns3/probe.h"
#include "ns3/file-aggregator.h"
#include "ns3/time-series-adaptor.h"

namespace ns3 {

/**
 * \ingroup stats
 * \brief Helper class used to put data values into a file.
 **/
class FileHelper
{
public:
  /**
   * Constructs a file helper that will create a space separated file
   * named "file-helper.txt" unless it is later configured otherwise.
   */
  FileHelper ();

  /**
   * \param outputFileNameWithoutExtension name of output file to
   * write with no extension
   * \param fileType type of file to write.
   *
   * Constructs a file helper that will create a file named
   * outputFileNameWithoutExtension plus possible extra information
   * from wildcard matches plus ".txt" with values printed as
   * specified by fileType.  The default file type is space-separated.
   */
  FileHelper (const std::string &outputFileNameWithoutExtension,
              enum FileAggregator::FileType fileType = FileAggregator::SPACE_SEPARATED);

  virtual ~FileHelper ();

  /**
   * \param outputFileNameWithoutExtension name of output file to
   * write with no extension
   * \param fileType type of file to write.
   *
   * Configures file related parameters for this file helper so that
   * it will create a file named outputFileNameWithoutExtension plus
   * possible extra information from wildcard matches plus ".txt" with
   * values printed as specified by fileType.  The default file type
   * is space-separated.
   */
  void ConfigureFile (const std::string &outputFileNameWithoutExtension,
                      enum FileAggregator::FileType fileType = FileAggregator::SPACE_SEPARATED);

  /**
   * \param typeId the type ID for the probe used when it is created.
   * \param path Config path for underlying trace source to be probed
   * \param probeTraceSource the probe trace source to access.
   *
   * Creates output files generated by hooking the ns-3 trace source
   * with a probe, and then writing the values from the
   * probeTraceSource. The output file names will have the text stored
   * in m_outputFileNameWithoutExtension plus ".txt", and will consist
   * of the 'newValue' at each timestamp.
   *
   * This method will create one or more probes according to the TypeId 
   * provided, connect the probe(s) to the trace source specified by
   * the config path, and hook the probeTraceSource(s) to the downstream 
   * aggregator.
   *
   * If the config path has more than one match in the system
   * (e.g. there is a wildcard), then one output file for each match
   * will be created.  The output file names will contain the text in
   * m_outputFileNameWithoutExtension plus the matched characters for
   * each of the wildcards in the config path, separated by dashes,
   * plus ".txt".  For example, if the value in
   * m_outputFileNameWithoutExtension is the string
   * "packet-byte-count", and there are two wildcards in the path,
   * then output file names like "packet-byte-count-0-0.txt" or
   * "packet-byte-count-12-9.txt" will be possible as names for the
   * files that will be created.
   *
   * A fatal error will result if an unknown probe type is used.
   */
  void WriteProbe (const std::string &typeId,
                   const std::string &path,
                   const std::string &probeTraceSource);

  /**
   * \param adaptorName the timeSeriesAdaptor's name.
   *
   * \brief Adds a time series adaptor to be used to write the file.
   */
  void AddTimeSeriesAdaptor (const std::string &adaptorName);

  /**
   * \param aggregatorName the aggregator's name.
   * \param outputFileName name of the file to write.
   * \param onlyOneAggregator indicates if more than one aggregator
   * should be created or not.
   *
   * \brief Adds an aggregator to be used to write values to files.
   */
  void AddAggregator (const std::string &aggregatorName,
                      const std::string &outputFileName,
                      bool onlyOneAggregator);

  /**
   * \param probeName the probe's name.
   * \return Ptr to the probe
   * \brief Gets the specified probe.
   */
  Ptr<Probe> GetProbe (std::string probeName) const;

  /**
   * \return Ptr to a FileAggregator object
   * \brief Gets the single aggregator that is always constructed.
   *
   * This function is non-const because an aggregator may be lazily
   * created by this method.
   */
  Ptr<FileAggregator> GetAggregatorSingle ();

  /**
   * \param aggregatorName name for aggregator.
   * \param outputFileName name of output file to write.
   * \return Ptr to a FileAggregator object
   * \brief Gets one of the multiple aggregators from the map.
   *
   * This function is non-const because an aggregator may be lazily
   * created by this method.
   */
  Ptr<FileAggregator> GetAggregatorMultiple (const std::string &aggregatorName,
                                             const std::string &outputFileName);

  /**
   * \param heading the heading string.
   *
   * \brief Sets the heading string that will be printed on the first
   * line of the file.
   *
   * Note that the heading string will only be printed if it has been
   * set by calling this function.
   */
  void SetHeading (const std::string &heading);

  /**
   * \param format the 1D format string.
   *
   * \brief Sets the 1D format string for the C-style sprintf()
   * function.
   */
  void Set1dFormat (const std::string &format);

  /**
   * \param format the 2D format string.
   *
   * \brief Sets the 2D format string for the C-style sprintf()
   * function.
   */
  void Set2dFormat (const std::string &format);

  /**
   * \param format the 3D format string.
   *
   * \brief Sets the 3D format string for the C-style sprintf()
   * function.
   */
  void Set3dFormat (const std::string &format);

  /**
   * \param format the 4D format string.
   *
   * \brief Sets the 4D format string for the C-style sprintf()
   * function.
   */
  void Set4dFormat (const std::string &format);

  /**
   * \param format the 5D format string.
   *
   * \brief Sets the 5D format string for the C-style sprintf()
   * function.
   */
  void Set5dFormat (const std::string &format);

  /**
   * \param format the 6D format string.
   *
   * \brief Sets the 6D format string for the C-style sprintf()
   * function.
   */
  void Set6dFormat (const std::string &format);

  /**
   * \param format the 7D format string.
   *
   * \brief Sets the 7D format string for the C-style sprintf()
   * function.
   */
  void Set7dFormat (const std::string &format);

  /**
   * \param format the 8D format string.
   *
   * \brief Sets the 8D format string for the C-style sprintf()
   * function.
   */
  void Set8dFormat (const std::string &format);

  /**
   * \param format the 9D format string.
   *
   * \brief Sets the 9D format string for the C-style sprintf()
   * function.
   */
  void Set9dFormat (const std::string &format);

  /**
   * \param format the 10D format string.
   *
   * \brief Sets the 10D format string for the C-style sprintf()
   * function.
   */
  void Set10dFormat (const std::string &format);

private:
  /**
   * \param typeId the type ID for the probe used when it is created.
   * \param probeName the probe's name.
   * \param path Config path to access the probe
   *
   * \brief Adds a probe to be used to write values to files.
   */
  void AddProbe (const std::string &typeId,
                 const std::string &probeName,
                 const std::string &path);

  /**
   * \param typeId the type ID for the probe used when it is created.
   * \param matchIdentifier this string is used to make the probe's
   * context be unique.
   * \param path Config path to access the probe.
   * \param probeTraceSource the probe trace source to access.
   * \param outputFileNameWithoutExtension name of output file to
   * write with no extension
   * \param onlyOneAggregator indicates if more than one aggregator
   * should be created or not.
   *
   * \brief Connects the probe to the aggregator.
   *
   * A fatal error will result if an unknown probe type is used.
   */
  void ConnectProbeToAggregator (const std::string &typeId,
                                 const std::string &matchIdentifier,
                                 const std::string &path,
                                 const std::string &probeTraceSource,
                                 const std::string &outputFileNameWithoutExtension,
                                 bool onlyOneAggregator);

  /// Used to create the probes and collectors as they are added.
  ObjectFactory m_factory;

  /// The single aggregator that is always created in the constructor.
  Ptr<FileAggregator> m_aggregator;

  /// Maps aggregator names to aggregators when multiple aggregators
  /// are needed.
  std::map<std::string, Ptr<FileAggregator> > m_aggregatorMap;

  /// Maps probe names to probes.
  std::map<std::string, std::pair <Ptr<Probe>, std::string> > m_probeMap;

  /// Maps time series adaptor names to time series adaptors.
  std::map<std::string, Ptr<TimeSeriesAdaptor> > m_timeSeriesAdaptorMap;

  /// Number of file probes that have been created.
  uint32_t m_fileProbeCount;

  /// Determines the kind of file written by the aggregator.
  enum FileAggregator::FileType m_fileType;

  /// The name of the output file to created without its extension.
  std::string m_outputFileNameWithoutExtension;

  /// Indicates if the heading line for the file has been set.
  bool m_hasHeadingBeenSet;

  /// Heading line for the outputfile.
  std::string m_heading;

  std::string m_1dFormat;  //!< Format string for 1D format C-style sprintf() function.
  std::string m_2dFormat;  //!< Format string for 2D format C-style sprintf() function.
  std::string m_3dFormat;  //!< Format string for 3D format C-style sprintf() function.
  std::string m_4dFormat;  //!< Format string for 4D format C-style sprintf() function.
  std::string m_5dFormat;  //!< Format string for 5D format C-style sprintf() function.
  std::string m_6dFormat;  //!< Format string for 6D format C-style sprintf() function.
  std::string m_7dFormat;  //!< Format string for 7D format C-style sprintf() function.
  std::string m_8dFormat;  //!< Format string for 8D format C-style sprintf() function.
  std::string m_9dFormat;  //!< Format string for 9D format C-style sprintf() function.
  std::string m_10dFormat; //!< Format string for 10D format C-style sprintf() function.

}; // class FileHelper


} // namespace ns3

#endif // FILE_HELPER_H