%%cpp -d
#include "RooRealVar.h"
#include "RooDataSet.h"
#include "RooGaussian.h"
#include "RooChebychev.h"
#include "RooExponential.h"
#include "RooAddPdf.h"
#include "RooPlot.h"
#include "RooCustomizer.h"
#include "TCanvas.h"
#include "TAxis.h"
#include "TH1.h"
using namespace RooFit;

RooRealVar x("x", "x", 0, 10);

RooRealVar mean("mean", "mean of gaussians", 5);
RooRealVar sigma("sigma", "width of gaussians", 0.5);
RooGaussian sig("sig", "Signal component 1", x, mean, sigma);

RooRealVar a0("a0", "a0", 0.5, 0., 1.);
RooRealVar a1("a1", "a1", 0.2, 0., 1.);
RooChebychev bkg1("bkg1", "Background 1", x, RooArgSet(a0, a1));

RooRealVar alpha("alpha", "alpha", -1);
RooExponential bkg2("bkg2", "Background 2", x, alpha);

RooRealVar bkg1frac("bkg1frac", "fraction of component 1 in background", 0.2, 0., 1.);
RooAddPdf bkg("bkg", "Signal", RooArgList(bkg1, bkg2), bkg1frac);

RooRealVar bkgfrac("bkgfrac", "fraction of background", 0.5, 0., 1.);
RooAddPdf model("model", "g1+g2+a", RooArgList(bkg, sig), bkgfrac);

RooRealVar y("y", "y", -10, 10);
RooDataSet data("data", "data", RooArgSet(x, y));

std::unique_ptr<RooArgSet> model_obs{model.getObservables(data)};
model_obs->Print("v");

std::unique_ptr<RooArgSet> model_params{model.getParameters(x)};
model_params->Print("v");

std::unique_ptr<RooArgSet> model_params2{model.getParameters(data)};
model_params2->Print();

std::unique_ptr<RooArgSet> model_comps{model.getComponents()};
model_comps->Print("v");

RooRealVar sigma2("sigma2", "width of gaussians", 1);
RooGaussian sig2("sig2", "Signal component 1", x, mean, sigma2);

RooRealVar sig1frac("sig1frac", "fraction of component 1 in signal", 0.8, 0., 1.);
RooAddPdf sigsum("sigsum", "sig+sig2", RooArgList(sig, sig2), sig1frac);

RooCustomizer cust(model, "cust");

cust.replaceArg(sig, sigsum);

RooAbsPdf *cust_clone = (RooAbsPdf *)cust.build(true);

cust_clone->Print("t");

delete cust_clone;