/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */

/*

 * Copyright (c) 2007 INRIA

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation;

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>

 */

#include "rectangle.h"

#include "vector.h"

#include "ns3/assert.h"

#include "ns3/fatal-error.h"

#include <cmath>

#include <algorithm>

#include <sstream> 

namespace ns3 {

Rectangle::Rectangle (double _xMin, double _xMax,

		      double _yMin, double _yMax)

  : xMin (_xMin),

    xMax (_xMax),

    yMin (_yMin),

    yMax (_yMax)

{}

Rectangle::Rectangle ()

  : xMin (0.0),

    xMax (0.0),

    yMin (0.0),

    yMax (0.0)

{}

bool 

Rectangle::IsInside (const Vector &position) const

{

  return 

    position.x <= this->xMax && position.x >= this->xMin &&

    position.y <= this->yMax && position.y >= this->yMin;

}

Rectangle::Side 

Rectangle::GetClosestSide (const Vector &position) const

{

  double xMinDist = std::abs (position.x - this->xMin);

  double xMaxDist = std::abs (this->xMax - position.x);

  double yMinDist = std::abs (position.y - this->yMin);

  double yMaxDist = std::abs (this->yMax - position.y);

  double minX = std::min (xMinDist, xMaxDist);

  double minY = std::min (yMinDist, yMaxDist);

  if (minX < minY)

    {

      if (xMinDist < xMaxDist)

        {

          return LEFT;

        }

      else

        {

          return RIGHT;

        }

    }

  else

    {

      if (yMinDist < yMaxDist)

        {

          return BOTTOM;

        }

      else

        {

          return TOP;

        }

    }

}

Vector

Rectangle::CalculateIntersection (const Vector &current, const Vector &speed) const

{

  NS_ASSERT (IsInside (current));

  double xMaxY = current.y + (this->xMax - current.x) / speed.x * speed.y;

  double xMinY = current.y + (this->xMin - current.x) / speed.x * speed.y;

  double yMaxX = current.x + (this->yMax - current.y) / speed.y * speed.x;

  double yMinX = current.x + (this->yMin - current.y) / speed.y * speed.x;

  bool xMaxYOk = (xMaxY <= this->yMax && xMaxY >= this->yMin);

  bool xMinYOk = (xMinY <= this->yMax && xMinY >= this->yMin);

  bool yMaxXOk = (yMaxX <= this->xMax && yMaxX >= this->xMin);

  bool yMinXOk = (yMinX <= this->xMax && yMinX >= this->xMin);

  if (xMaxYOk && speed.x >= 0)

    {

      return Vector (this->xMax, xMaxY, 0.0);

    }

  else if (xMinYOk && speed.x <= 0)

    {

      return Vector (this->xMin, xMinY, 0.0);

    }

  else if (yMaxXOk && speed.y >= 0)

    {

      return Vector (yMaxX, this->yMax, 0.0);

    }

  else if (yMinXOk && speed.y <= 0)

    {

      return Vector (yMinX, this->yMin, 0.0);

    }

  else

    {

      NS_ASSERT (false);

      // quiet compiler

      return Vector (0.0, 0.0, 0.0);

    }

}

ATTRIBUTE_HELPER_CPP (Rectangle);

std::ostream &

operator << (std::ostream &os, const Rectangle &rectangle)

{

  os << rectangle.xMin << "|" << rectangle.xMax << "|" << rectangle.yMin << "|" << rectangle.yMax;

  return os;

}

std::istream &

operator >> (std::istream &is, Rectangle &rectangle)

 {

  char c1, c2, c3;

  is >> rectangle.xMin >> c1 >> rectangle.xMax >> c2 >> rectangle.yMin >> c3 >> rectangle.yMax;

  if (c1 != '|' ||

      c2 != '|' ||

      c3 != '|')

    {

      is.setstate (std::ios_base::failbit);

    }

  return is;

}

} // namespace ns3