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 #ifndef ALIGNMENT_OFFLINEVALIDATION_TREND_H
 #define ALIGNMENT_OFFLINEVALIDATION_TREND_H
 
 #include "boost/filesystem.hpp"
 #include "boost/property_tree/ptree.hpp"
 #include "boost/property_tree/json_parser.hpp"
 
 #include "TROOT.h"
 #include "TCanvas.h"
 #include "TLegend.h"
 #include "TGraph.h"
 
 ////////////////////////////////////////////////////////////////////////////////
 /// Functor to obtain delivered luminosity corresponding to a given range.
 ///
 /// The constructor extracts the luminosity from an 2-column file (see constructor),
 /// and the operator() returns the accumulated luminosity for any subrange.
 ///
 /// Another overload of the operator() allows the conversion of a `TGraphErrors`
 /// as a function of the run number to another `TGraphErrors` as a function of the
 /// luminosity.
 struct Run2Lumi {
   const int firstRun,  //!< first run, starting at lumi = 0 on the x-axis of the trend
       lastRun;         //!< last run (excluded!), starting at the max lumi on the x-axis of the trend
   const float convertUnit;
 
 private:
   std::map<int, float> runs;  //!< couples of run and corresponding luminosity
 
 public:
   ////////////////////////////////////////////////////////////////////////////////
   /// Constructor, takes as input a 2-column file that will populate the map `runs`
   /// as well as the global range.
   ///
   /// (Note: in principle, the global range could be extracted from the 2-column file,
   /// but the choice here is to have one standard lumi file, leaving as only freedom
   /// to the user the possibility to change the global range depending on the analysis.)
   Run2Lumi(boost::filesystem::path file,  //!< path to a 2-column file with 6-digit run number and lumi in /pb
            int first,                     //!< 6-digit run number (included)
            int last,                      //!< 6-digit run number (excluded)
            float convertUnit              //!< default is from pb to fb
   );
 
   ////////////////////////////////////////////////////////////////////////////////
   /// Sums luminosity for [run1, run2[ and returns it in /fb.
   float operator()(int run1, int run2) const;
 
   ////////////////////////////////////////////////////////////////////////////////
   /// Sums luminosity for [firstRun, run[
   float operator()(int run) const;
 
   ////////////////////////////////////////////////////////////////////////////////
   /// Sums luminosity for [firstRun, lastRun[
   float operator()() const;
 
   ////////////////////////////////////////////////////////////////////////////////
   /// Converts a `TGraph` given as a function of the run number
   /// to another `TGraph` as a function of the luminosity
   /// in the global subrange.
   TGraph* operator()(TGraph* gIn) const;
 
   ////////////////////////////////////////////////////////////////////////////////
   /// Converts a `TH1` given as a function of the run number
   /// to another `TH1` as a function of the luminosity
   /// in the global subrange.
   ///
   /// Note: the run is expected to be on the low edge of each bin
   TH1* operator()(TH1* hIn) const;
 };
 
 ////////////////////////////////////////////////////////////////////////////////
 /// Standard canvas for TkAl trends as a function of delivered lumi.
 ///
 /// The constructor and the destructor take care of the style,
 /// The operator() is overloaded and should be given a trend as a function of
 /// the run number (either `TGraphErrors` or `TH1`).
 /// The verticles lines (e.g. pixel templates) are given via a JSON file.
 struct Trend {
   TString CMS = "#scale[1.1]{#bf{CMS}} #it{Internal}";  //!< top left label
   TString lumi =
       "#scale[0.8]{pp collisions (2016+2017+2018)}";  //!< top right label (not necessarily the lumi, just following the convention from `CMS_lumi.h`)
   std::string plotUnit = "fb";
 
   float fontsize = 0.04;
 
   TCanvas c;
   const char* outputDir;  //directory for plots
   TLegend lgd;
 
   const boost::property_tree::ptree JSON;  //!< contains coordinate for vertical lines
   const Run2Lumi& GetLumi;                 //!< functor to get luminosity for given subrange
   const char* lumiType;                    //specify whether luminosity is recorded or delivered
 
   Trend                                    //!< constructor, prepares canvas and frame
       (const char* name,                   //!< TCanvas name, also used for output PDF
        const char* dir,                    //directory for plots
        const char* title,                  //!< TCanvas title, also used for output PDF (but not shown on the canvas)
        const char* ytitle,                 //!< y-axis title
        float ymin,                         //!< y-axis minimum
        float ymax,                         //!< y-axis maximum
        boost::property_tree::ptree& json,  //!< vertical lines from JSON
        const Run2Lumi& GetLumiFunctor,     //!< functor
        const char* lumiAxisType            //specify whether luminosity is recorded or delivered
       );
 
   ////////////////////////////////////////////////////////////////////////////////
   /// Operator overloading to plot a trend (given as a function of run number)
   /// as a function of the luminosity.
   void operator()(TObject* obj,          //!< e.g. graph
                   TString drawOpt,       //!< e.g. option for `TGraph::Draw()`
                   TString lgdOpt,        //!< option for `TLegend::Draw()`
                   bool fullRange = true  //!< flag to force the graph to touch the right edge
   );
 
   ////////////////////////////////////////////////////////////////////////////////
   /// Destructor applies fine tuning of the plots, e.g. legend, labels, etc.
   /// and finally prints to PDF.
   ~Trend();
 };
 
 template <typename T, typename... Args>
 inline T* Get(Args... args) {
   return dynamic_cast<T*>(gDirectory->Get(args...));
 }
 
 #endif  // ALIGNMENT_OFFLINEVALIDATION_TREND_H

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