/*
 * Copyright (c) 2013 University of Washington
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 * Author: Mitch Watrous (watrous@u.washington.edu)
 */

#ifndef GNUPLOT_HELPER_H
#define GNUPLOT_HELPER_H

#include "ns3/gnuplot-aggregator.h"
#include "ns3/object-factory.h"
#include "ns3/probe.h"
#include "ns3/ptr.h"
#include "ns3/time-series-adaptor.h"

#include <map>
#include <string>
#include <utility>

namespace ns3
{

/**
 * @ingroup gnuplot
 * @brief Helper class used to make gnuplot plots.
 **/
class GnuplotHelper
{
  public:
    /**
     * Constructs a gnuplot helper that will create a space separated
     * gnuplot data file named "gnuplot-helper.dat", a gnuplot control
     * file named "gnuplot-helper.plt", and a shell script to generate
     * the gnuplot named "gnuplot-helper.sh" unless it is later
     * configured otherwise.
     */
    GnuplotHelper();

    /**
     * @param outputFileNameWithoutExtension name of gnuplot related files to
     * write with no extension
     * @param title plot title string to use for this plot.
     * @param xLegend the legend for the x horizontal axis.
     * @param yLegend the legend for the y vertical axis.
     * @param terminalType terminal type setting string for output. The
     * default terminal type is "png"
     *
     * Constructs a gnuplot helper that will create a space separated
     * gnuplot data file named outputFileNameWithoutExtension + ".dat",
     * a gnuplot control file named outputFileNameWithoutExtension +
     * ".plt", and a shell script to generate the gnuplot named
     * outputFileNameWithoutExtension + ".sh".
     */
    GnuplotHelper(const std::string& outputFileNameWithoutExtension,
                  const std::string& title,
                  const std::string& xLegend,
                  const std::string& yLegend,
                  const std::string& terminalType = "png");

    virtual ~GnuplotHelper();

    /**
     * @param outputFileNameWithoutExtension name of gnuplot related files to
     * write with no extension
     * @param title plot title string to use for this plot.
     * @param xLegend the legend for the x horizontal axis.
     * @param yLegend the legend for the y vertical axis.
     * @param terminalType terminal type setting string for output. The
     * default terminal type is "png"
     *
     * Configures plot related parameters for this gnuplot helper so
     * that it will create a space separated gnuplot data file named
     * outputFileNameWithoutExtension + ".dat", a gnuplot control file
     * named outputFileNameWithoutExtension + ".plt", and a shell script
     * to generate the gnuplot named outputFileNameWithoutExtension +
     * ".sh".
     */
    void ConfigurePlot(const std::string& outputFileNameWithoutExtension,
                       const std::string& title,
                       const std::string& xLegend,
                       const std::string& yLegend,
                       const std::string& terminalType = "png");

    /**
     * @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.
     * @param title the title to be associated to this dataset
     * @param keyLocation the location of the key in the plot.
     *
     * Plots a dataset generated by hooking the ns-3 trace source with a
     * probe, and then plot the values from the probeTraceSource. The dataset
     * will have the provided title, 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 dataset for each match will
     * be plotted.  The dataset titles will be suffixed with the matched
     * characters for each of the wildcards in the config path,
     * separated by spaces.  For example, if the proposed dataset title
     * is the string "bytes", and there are two wildcards in the path,
     * then dataset titles like "bytes-0 0" or "bytes-12 9" will be
     * possible as labels for the datasets that are plotted.
     */
    void PlotProbe(const std::string& typeId,
                   const std::string& path,
                   const std::string& probeTraceSource,
                   const std::string& title,
                   GnuplotAggregator::KeyLocation keyLocation = GnuplotAggregator::KEY_INSIDE);

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

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

    /**
     * @return Ptr to GnuplotAggregator object
     * @brief Gets the aggregator.
     *
     * This function is non-const because an aggregator may be lazily
     * created by this method.
     */
    Ptr<GnuplotAggregator> GetAggregator();

  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 make the plot.
     */
    void AddProbe(const std::string& typeId, const std::string& probeName, const std::string& path);

    /**
     * @brief Constructs the aggregator.
     */
    void ConstructAggregator();

    /**
     * @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 title the title to be associated to this dataset.
     *
     * @brief Connects the probe to the aggregator.
     */
    void ConnectProbeToAggregator(const std::string& typeId,
                                  const std::string& matchIdentifier,
                                  const std::string& path,
                                  const std::string& probeTraceSource,
                                  const std::string& title);

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

    /// The aggregator used to make the plots.
    Ptr<GnuplotAggregator> m_aggregator;

    /// 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 plot probes that have been created.
    uint32_t m_plotProbeCount;

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

    /// Title string to use for this plot.
    std::string m_title;

    /// Legend for the x axis.
    std::string m_xLegend;

    /// Legend for the y axis.
    std::string m_yLegend;

    /// Terminal type for the plot.
    std::string m_terminalType;
};

} // namespace ns3

#endif // GNUPLOT_HELPER_H
