// -*- mode: c++; c-basic-offset: 2; -*-

#ifndef ARGS_HH
#define ARGS_HH

#include <iostream>
#include <string>
#include <vector>

class Args {
public:
  virtual ~Args() {}

  static Args* create();

  virtual void add(char short_opt, std::string const& long_opt,
                   std::string const& argument, std::string const& help) = 0;
  void add(char short_opt, std::string const& long_opt,
           std::string const& help) {
    add(short_opt, long_opt, "", help);
  }
  void add(std::string const& long_opt, std::string const& help) {
    add('\0', long_opt, "", help);
  }
  void add(std::string const& long_opt, std::string const& argument,
           std::string const& help) {
    add('\0', long_opt, argument, help);
  }

  bool run(int argc, char** argv) {
    return run(argc, argv, std::cerr);
  }
  virtual bool run(int argc, char** argv, std::ostream& out) = 0;
  bool run(std::string const& prg, int argc, char** argv) {
    return run(prg, argc, argv, std::cerr);
  }
  virtual bool run(
      std::string const& prg, int argc, char** argv, std::ostream& out) = 0;
  virtual bool good() const = 0;

  virtual bool is_set(char short_opt) const = 0;
  virtual bool is_set(std::string const& long_opt) const = 0;
  virtual char const* arg(char short_opt, char const* fallback) const = 0;
  virtual char const* arg(std::string const& long_opt,
                          char const* fallback) const = 0;

  virtual std::vector<std::string> const& arguments() const = 0;

  void print_help() const {
    print_help(std::cout);
  }
  virtual void print_help(std::ostream& out) const = 0;
  virtual void print_help(std::ostream& out, size_t width) const = 0;

protected:
  Args() {}
  Args(Args const&) = delete;
};

#endif  // ARGS_HH