#include<iostream>

#include<TFile.h>
#include<TTree.h>

#include<TUUID.h>

void uuidFile()
{
    auto file = TFile::Open("testUUID.root","recreate");
    auto tree = new TTree("cal","cal");
    
    TUUID run_info;
    
    tree->Branch("info_run",&run_info);
    
    for(int i=0;i<10;i++)
    {
        run_info=TUUID();
        tree->Fill();
    }
    tree->Write();
    file->Write();
    file->Close();
    delete file;
}

void testUUIDInTFile()
{
    uuidFile();
    auto file = TFile::Open("testUUID.root","READONLY");
    auto tree = dynamic_cast<TTree*>(file->FindObjectAny("cal"));
    
    if(tree)
    {
        //tree->SetBranchStatus("*",false);
        TUUID lastid;
        TUUID* id = nullptr;
        std::string name = "info_run";
        if(tree->GetBranch(name.c_str())!=nullptr){
            tree->SetBranchStatus(name.c_str(),true);
            tree->SetBranchAddress(name.c_str(),&id);
            for(int entry = 0;entry<tree->GetEntries();++entry)
            {
                tree->GetEntry(entry);
                if(lastid!=*id)
                {
                    std::cout<<"found new run "<<id->AsString()<<std::endl;
                    lastid=*id;
                }
            }
        }
    }
}