#ifndef ARGS_HH
#define ARGS_HH

#include <cstdint>
#include <iosfwd>
#include <memory>
#include <string>
#include <string_view>
#include <vector>

class Args {
 public:
  virtual ~Args() = default;

  class Option {
   public:
    virtual ~Option() = default;

    [[nodiscard]] virtual bool is_set() const = 0;

   protected:
    Option() = default;
    Option(Option const&) = delete;
    Option& operator=(Option const&) = delete;
  };

  class OptionArgument : public Option {
   public:
    [[nodiscard]] virtual bool has_argument() const = 0;
    [[nodiscard]] virtual const std::string& argument() const = 0;
  };

  static std::unique_ptr<Args> create(std::string prgname = std::string());

  virtual std::shared_ptr<Option> option(char shortname,
                                         std::string longname = std::string(),
                                         std::string help = std::string()) = 0;

  std::shared_ptr<Option> option(std::string longname,
                                 std::string help = std::string());

  virtual std::shared_ptr<OptionArgument> option_argument(
      char shortname, std::string longname = std::string(),
      std::string arg = std::string(), std::string help = std::string(),
      bool required = true) = 0;

  std::shared_ptr<OptionArgument> option_argument(
      std::string longname, std::string arg = std::string(),
      std::string help = std::string(), bool required = true);

  virtual bool run(int argc, char** argv,
                   std::vector<std::string_view>* arguments = nullptr) = 0;

  virtual void print_error(std::ostream& out) const = 0;

  virtual void print_help(std::ostream& out, uint32_t width = 79) const = 0;

 protected:
  Args() = default;
  Args(Args const&) = delete;
  Args& operator=(Args const&) = delete;
};

#endif  // ARGS_HH