/*
 * This file is part of the Owl Positioning System (OwlPS).
 * OwlPS is a project of the University of Franche-Comte
 * (Université de Franche-Comté), France.
 *
 * Copyright © Université de Franche-Comté 2007-2012.
 *
 * Corresponding author: Matteo Cypriani <mcy@lm7.fr>
 *
 ***********************************************************************
 *
 * This software is governed by the CeCILL license under French law and
 * abiding by the rules of distribution of free software. You can use,
 * modify and/or redistribute the software under the terms of the CeCILL
 * license as circulated by CEA, CNRS and INRIA at the following URL:
 * http://www.cecill.info
 *
 * As a counterpart to the access to the source code and rights to copy,
 * modify and redistribute granted by the license, users are provided
 * only with a limited warranty and the software's authors, the holder
 * of the economic rights, and the successive licensors have only
 * limited liability.
 *
 * In this respect, the user's attention is drawn to the risks
 * associated with loading, using, modifying and/or developing or
 * reproducing the software by the user in light of its specific status
 * of free software, that may mean that it is complicated to manipulate,
 * and that also therefore means that it is reserved for developers and
 * experienced professionals having in-depth computer knowledge. Users
 * are therefore encouraged to load and test the software's suitability
 * as regards their requirements in conditions enabling the security of
 * their systems and/or data to be ensured and, more generally, to use
 * and operate it in the same conditions as regards security.
 *
 * The fact that you are presently reading this means that you have had
 * knowledge of the CeCILL license and that you accept its terms.
 *
 ***********************************************************************
 */


#include "inputmedium.hh"
#include "calibrationrequest.hh"
#include "stock.hh"
#include "configuration.hh"
#include "posexcept.hh"

using namespace std ;



/* *** Constructors *** */


InputMedium::InputMedium():
  current_line_nb(0)
{
  current_request = new Request() ;
}


InputMedium::~InputMedium()
{
  delete current_request ;
}



/* *** Operations *** */


/**
 * Reads a Request, increments current_line_nb, updates #current_request
 * and returns it.
 *
 * The input medium should be ready to be read before precessing
 * requests; otherwise, #current_request is \link Request::clear()
 * cleared\endlink and a blank Request is returned.
 *
 * @return The Request read, or an empty Request in case of error or
 * EOF (note that when casted to bool, an empty Request is \em false,
 * see Request::operator bool()).
 */
const Request& InputMedium::get_next_request()
{
  clear_current_request() ;

  if (! fill_current_request())
    {
      clear_current_request() ;
      return *current_request ;
    }

  current_request->received_now() ;
  return *current_request ;
}


void InputMedium::clear_current_request()
{
  if (dynamic_cast<CalibrationRequest*>(current_request) == NULL)
    current_request->clear() ;
  else
    {
      delete current_request ;
      current_request = NULL ;
      current_request = new Request() ;
    }
}


/**
 * The \em position argument can be changed by this function.
 */
void InputMedium::
fill_calibration_request_data(const string &mac_mobile, Point3D &position,
                              const Direction &direction, uint8_t type)
{
  // We set the real coordinates (if found) for non-calibration requests
  if (type != OWL_REQUEST_CALIBRATION &&
      type != OWL_REQUEST_AUTOCALIBRATION)
    {
      if (position)
        current_request->set_real_position(position) ;
      return ;
    }

  if (position)
    {
      // Update the AP's coordinates if allowed (and if the mobile is
      // an AP, of course)
      if (Configuration::
          bool_value("positioning.update-ap-coordinates-online"))
        {
          if (type == OWL_REQUEST_AUTOCALIBRATION &&
              Configuration::bool_value("positioning.accept-new-aps"))
            {
              AccessPoint &transmitter =
                const_cast<AccessPoint&>(
                  Stock::find_create_ap(mac_mobile)) ;
              transmitter.set_coordinates(position) ;
            }
          else
            {
              try
                {
                  AccessPoint &transmitter =
                    const_cast<AccessPoint&>(Stock::get_ap(mac_mobile)) ;
                  transmitter.set_coordinates(position) ;
                }
              catch (element_not_found &e)
                {
                  // The mobile is not an AP or the AP does not exist
                }
            }
        }
    }

  else if (type == OWL_REQUEST_AUTOCALIBRATION)
    {
      // If an autocalibration request does not contain the coordinates
      // of the AP, we use the current coordinates of the AP as
      // ReferencePoint.
      try
        {
          AccessPoint &transmitter =
            const_cast<AccessPoint&>(Stock::get_ap(mac_mobile)) ;
          position = transmitter.get_coordinates() ;
        }
      catch (element_not_found &e)
        {
          // The mobile is not an AP or the AP does not exist
        }
    }

  const ReferencePoint &reference_point =
    Stock::find_create_reference_point(position) ;
  current_request_to_calibration_request(
    &reference_point, direction, type) ;
}


void InputMedium::
current_request_to_calibration_request(
  const ReferencePoint *const reference_point,
  const Direction &direction,
  const uint_fast8_t request_type)
{
  CalibrationRequest *calibration_request =
    dynamic_cast<CalibrationRequest*>(current_request) ;
  if (calibration_request != NULL)
    {
      calibration_request->set_reference_point(reference_point) ;
      calibration_request->set_direction(direction) ;
      calibration_request->set_type(request_type) ;
      return ;
    }

  Request *tmp = current_request ;
  current_request = NULL ;
  current_request =
    new CalibrationRequest(*tmp,
                           const_cast<ReferencePoint*>(reference_point),
                           direction, request_type) ;
  delete tmp ;
}