/*
 * Graph6Writer.hpp
 *
 *  Created on: Apr 2, 2021
 *      Author: heber
 */


#ifndef GRAPH_GRAPH6WRITER_HPP_
#define GRAPH_GRAPH6WRITER_HPP_

// include config.h
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <iosfwd>
#include <vector>

#include "types.hpp"

class atom;

/** This functor prints a set of atoms as a graph6 formatted strings and returns
 * all elements as a vector in the same order as the nodes in the graph6
 * representation.
 *
 * This is inspired by https://github.com/adrianN/graph6/, only I found the code
 * there quite ugly and unnecessarily complicated: inheriting from std::iterator,
 * overriding all the operators (++, *, ...) for no apparent reason instead of
 * adding normal functions, ...
 *
 */
 struct Graph6Writer
{
   const std::vector<const atom *> _atoms;

   Graph6Writer(const std::vector<const atom *> atoms);

   void write_n(std::ostream& out);

   void write_graph6(std::ostream& out);

   void write_elementlist(std::ostream& out);

   void write_simple_elementlist(std::ostream& out);

private:
   atomId_t getBoundaryNonHydrogen() const;
};


#endif /* GRAPH_GRAPH6WRITER_HPP_ */