#include <iostream>
#include <string>

#include <cstdio>
#include <cstdlib>

#include <readline/readline.h>
#include <readline/history.h>

#include "gui-main.h"
#include "tty-main.h"

#include "parse.h"

namespace tty
{
  int main (int, char **)
  {
    std::cout
      << "Example Calculator.\n"
      << "Available operations: + - * / ^ ()\n"
      << "Semicolon terminates statement.\n"
      << "GNU Readline available for history editing.\n" << std::endl;

    interpreter::parser_init ();

    for (;;)
      {
        char *tmp = readline (interpreter::beg_of_stmt ? ">> " : "");

        if (! tmp)
          break;

        if (*tmp)
          {
            add_history (tmp);
            using_history ();
          }

        std::string line = tmp;

        free (tmp);

        int status = interpreter::parse_and_execute (line);

        if (status < 0)
          break;
      }

    interpreter::parser_fini ();

    return 0;
  }

  void emit_result (double value)
  {
    std::cout << "ans = " << value << std::endl;
  }

  void emit_error (const char *msg)
  {
    std::cerr << "parse error: " << msg << std::endl;
  }
}