ITrigGlobalEfficiencyCorrectionTool.h

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/*
  Copyright (C) 2002-2018 CERN for the benefit of the ATLAS collaboration
*/
 
// contact: jmaurer@cern.ch
 
#ifndef TRIGGERANALYSISINTERFACES_ITRIGGLOBALEFFICIENCYCORRECTIONTOOL_H
#define TRIGGERANALYSISINTERFACES_ITRIGGLOBALEFFICIENCYCORRECTIONTOOL_H 1
 
#include "PATInterfaces/ISystematicsTool.h"
#include "PATInterfaces/CorrectionCode.h"
#include "xAODEgamma/Electron.h"
#include "xAODMuon/Muon.h"
#include "xAODEgamma/Photon.h"
 
#include <vector>
#include <type_traits>
#include <string_view>
 
class ITrigGlobalEfficiencyCorrectionTool : public virtual CP::ISystematicsTool
{
public:
    ASG_TOOL_INTERFACE(ITrigGlobalEfficiencyCorrectionTool)
    
    template<typename Arg> static constexpr bool validArgs(unsigned nTrailingDoubles);
    template<typename Arg1, typename Arg2, typename... OtherArgs> static constexpr bool validArgs(unsigned nTrailingDoubles);
 
    virtual CP::CorrectionCode getEfficiencyScaleFactor(const std::vector<const xAOD::IParticle*>& particles, double& efficiencyScaleFactor) = 0;
    virtual CP::CorrectionCode getEfficiency(const std::vector<const xAOD::IParticle*>& particles, double& efficiencyData, double& efficiencyMc) = 0;
    virtual CP::CorrectionCode checkTriggerMatching(bool& matched, const std::vector<const xAOD::IParticle*>& particles) = 0;
    
    template<typename... Args>
    auto getEfficiencyScaleFactor(Args&... args) -> std::enable_if_t<validArgs<Args...>(1), CP::CorrectionCode>;
    template<typename... Args>
    auto getEfficiency(Args&... args) -> std::enable_if_t<validArgs<Args...>(2), CP::CorrectionCode>;
    template<typename... Args>
    auto checkTriggerMatching(bool& matched, Args&... args) -> std::enable_if_t<validArgs<Args...>(0), CP::CorrectionCode>;
    
    virtual CP::CorrectionCode getRelevantTriggers(std::vector<std::string>& triggers) = 0;
    
    virtual CP::CorrectionCode countTriggerLegs(const std::string& trigger, std::size_t& numberOfLegs) = 0;
    
    virtual CP::CorrectionCode getEfficiencyScaleFactor(unsigned runNumber, const std::vector<const xAOD::IParticle*>& particles, double& efficiencyScaleFactor) = 0;
    virtual CP::CorrectionCode getEfficiency(unsigned runNumber, const std::vector<const xAOD::IParticle*>& particles, double& efficiencyData, double& efficiencyMc) = 0;   
    
    static std::string toolnameForDefaultScaleFactor() { return "RETURN_DEFAULT_SCALE_FACTOR"; }
protected:
    double* handleArg(double& arg, std::vector<const xAOD::IParticle*>&) { return &arg; }
    template<typename P>  double* handleArg(const std::vector<P>& arg, std::vector<const xAOD::IParticle*>& particles)
    {
        for(auto ptr : arg) particles.push_back(static_cast<const xAOD::IParticle*>(ptr));
        return nullptr;
    }
};
 
template<typename Arg>
constexpr bool ITrigGlobalEfficiencyCorrectionTool::validArgs(unsigned nTrailingDoubles)
{
    if(std::is_same<double, Arg>::value) return (nTrailingDoubles==1);
    using P = std::remove_cv_t<Arg>;
    return std::is_same<P, std::vector<xAOD::Electron*>>::value
        || std::is_same<P, std::vector<const xAOD::Electron*>>::value
        || std::is_same<P, std::vector<xAOD::Muon*>>::value
        || std::is_same<P, std::vector<const xAOD::Muon*>>::value
        || std::is_same<P, std::vector<xAOD::Photon*>>::value
        || std::is_same<P, std::vector<const xAOD::Photon*>>::value;
}
 
template<typename Arg1, typename Arg2, typename... OtherArgs>
constexpr bool ITrigGlobalEfficiencyCorrectionTool::validArgs(unsigned nTrailingDoubles)
{
    bool xs [] = { std::is_same<OtherArgs, double>::value..., true };
    for(bool x : xs) if(!x) return validArgs<Arg1>(0) && validArgs<Arg2, OtherArgs...>(nTrailingDoubles);
    unsigned nTD = sizeof...(OtherArgs);
    if(nTD == nTrailingDoubles) return validArgs<Arg1>(0) && validArgs<Arg2>(0);
    if(nTD == nTrailingDoubles-1) return validArgs<Arg1>(0) && std::is_same<Arg2, double>::value;
    if(nTD == nTrailingDoubles-2) return std::is_same<Arg1, double>::value && std::is_same<Arg2, double>::value;
    return false;
}
 
template<typename... Args>
auto ITrigGlobalEfficiencyCorrectionTool::getEfficiencyScaleFactor(Args&... args)
    -> std::enable_if_t<validArgs<Args...>(1), CP::CorrectionCode>
{
    std::vector<const xAOD::IParticle*> particles;
    double* sf[] = { nullptr, handleArg(args, particles)... };
    return getEfficiencyScaleFactor(particles, *sf[sizeof...(Args)]);
}
 
template<typename... Args>
auto ITrigGlobalEfficiencyCorrectionTool::getEfficiency(Args&... args)
    -> std::enable_if_t<validArgs<Args...>(2), CP::CorrectionCode>
{
    std::vector<const xAOD::IParticle*> particles;
    double* eff[] = { nullptr, handleArg(args, particles)... };
    return getEfficiency(particles, *eff[sizeof...(Args)-1], *eff[sizeof...(Args)]);
}
 
template<typename... Args>
auto ITrigGlobalEfficiencyCorrectionTool::checkTriggerMatching(bool& matched, Args&... args)
    -> std::enable_if_t<validArgs<Args...>(0), CP::CorrectionCode>
{
    std::vector<const xAOD::IParticle*> particles;
    double* eff[] __attribute__((unused)) = { nullptr, handleArg(args, particles)... };
    return checkTriggerMatching(matched, particles);
}
 
#endif //> !TRIGGERANALYSISINTERFACES_ITRIGGLOBALEFFICIENCYCORRECTIONTOOL_H