const.h

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/* ***********************************************************************
//
//   Copyright (C) 2025 -- The 4D-STAR Collaboration
//   File Author: Emily Boudreaux
//   Last Modified: March 17, 2025
//
//   4DSSE is free software; you can use it and/or modify
//   it under the terms and restrictions the GNU General Library Public
//   License version 3 (GPLv3) as published by the Free Software Foundation.
//
//   4DSSE is distributed in the hope that it will be useful,
//   but WITHOUT ANY WARRANTY; without even the implied warranty of
//   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
//   See the GNU Library General Public License for more details.
//
//   You should have received a copy of the GNU Library General Public License
//   along with this software; if not, write to the Free Software
//   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// *********************************************************************** */
#pragma once
#include <string>
#include <iostream>
#include <set>
#include <map>
 
namespace serif::constant {
struct Constant {
  const std::string name;         
  const double value;             
  const double uncertainty;       
  const std::string unit;         
  const std::string reference;    

  Constant(const std::string& name, const double value, const double uncertainty, const std::string& unit, const std::string& reference)
    : name(name), value(value), uncertainty(uncertainty), unit(unit), reference(reference) {}

   friend std::ostream& operator<<(std::ostream& os, const Constant& c) {
     os << "<" << c.name << ": ";
     os << c.value << "±" << c.uncertainty << " ";
     os << c.unit << " (" << c.reference << ")>\n";
     return os;
   }
};

class Constants {
private:
  bool loaded_ = false; 
  const int col_widths_[6] = {25, 52, 20, 20, 17, 45}; // From the python script used to generate the constants file
  std::map<std::string, Constant> constants_; 

  Constants();

  bool load();

  bool initialize();

  std::string trim(const std::string& str);
 
public:

  static Constants& getInstance() {
    static Constants instance;
    return instance;
  }

  bool isLoaded() const { return loaded_; }

  Constant get(const std::string& key) const;

  Constant operator[](const std::string& key) const;

  bool has(const std::string& key) const;

  std::set<std::string> keys() const;
 
};
 
} // namespace serif::const