#include "userinterface.hh"
#include "configuration.hh"

#include <iostream>
#include <fstream>
#include <boost/program_options.hpp>

using namespace std ;
namespace po = boost::program_options ;



/* *** Default value definitions *** */

#define DEFAULT_CONFIG_FILE_NAME "cfg/owlps-positioning.cfg"
#define DEFAULT_LISTENING_PORT 9902



/* *** Constructors *** */


UserInterface::UserInterface(const int argc, char **argv)
{
  cli_argument_count = argc ;
  cli_argument_values = argv ;
  config_file_name = DEFAULT_CONFIG_FILE_NAME ;

  cli_options = new po::options_description("General options") ;
  file_options = new po::options_description("Parameters") ;
  fill_options() ;

  parse_options() ;
}


UserInterface::~UserInterface()
{
  delete cli_options ;
  delete file_options ;
}



/* *** Operations *** */


void UserInterface::fill_options()
{
  fill_cli_options() ;
  fill_file_options() ;

  // File options are also accepted on the command line
  cli_options->add(*file_options) ;
}


void UserInterface::fill_cli_options()
{
  cli_options->add_options()
  ("help,h", "Print help")
  ("config-file,f", po::value<string>(),
   "Alternative configuration file")
  ;
}


void UserInterface::fill_file_options()
{
  file_options->add_options()
  ("server.port,l", po::value<int>()
   ->default_value(DEFAULT_LISTENING_PORT),
   "Server listening port")
  ;
}


void UserInterface::parse_options()
{
  parse_command_line() ;
  print_usage_and_exit_if_requested() ;

  // Was the config file name specified on the command line?
  if (Configuration::is_configured("config-file"))
    config_file_name = Configuration::get_string_value("config-file") ;

  parse_file() ;

  po::notify(Configuration::getw_configuration()) ;
}


void UserInterface::parse_command_line() const
{
  po::store(po::parse_command_line(cli_argument_count,
                                   cli_argument_values,
                                   *cli_options),
            Configuration::getw_configuration()) ;
}


void UserInterface::print_usage_and_exit_if_requested() const
{
  if (Configuration::is_configured("help"))
    {
      cout << *cli_options ;
      exit(0) ;
    }
}


void UserInterface::parse_file() const
{
  ifstream config_file(config_file_name.c_str()) ;

  if (! config_file)
    {
      cerr
          << "Warning! Error opening input configuration file « "
          << config_file_name
          << " »! Using command line and default values…"
          << endl ;
      return ;
    }

  po::store(po::parse_config_file(config_file, *file_options),
            Configuration::getw_configuration()) ;
}