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// Copyright (C) 2011 Soren Hauberg
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 3
// of the License, or (at your option) any later version.
//
// 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, see <http://www.gnu.org/licenses/>.
 
#ifndef AUXIL_H
#define AUXIL_H

#include <string>
#include <vector>
#include <iostream>
#include "math_types.h"

#ifdef _MSC_VER
const std::string path_sep ("\\");
#else
const std::string path_sep ("/");
#endif

inline
std::string fullfile (const std::string &dir, const std::string &filename)
{
  return dir + path_sep + filename;
}

inline
std::string fullfile (const std::string &dir1, const std::string &dir2, const std::string &filename)
{
  return dir1 + path_sep + dir2 + path_sep + filename;
}

template <class T>
inline
int find_max_idx (const std::vector<T> &vec)
{
  const int N = vec.size ();
  
  int max_idx = 0;
  
  for (int i = 1; i < N; i++)
    if (vec [i] > vec [max_idx])
      max_idx = i;
  
  return max_idx;
}

template <class T>
inline
T find_max (const std::vector<T> &vec)
{
  return vec [find_max_idx (vec)];
}

inline
double mod_2pi (const double dx)
{
  const double dm = 2.0 * M_PI;
  if (dx < 0)
    return dm + dx + dm * floor (-dx/dm);
  else    
    return dx - dm * floor (dx/dm);
}

inline
double mod_pi (const double dx)
{
  const double dm = M_PI;
  if (dx < 0)
    return dm + dx + dm * floor (-dx/dm);
  else    
    return dx - dm * floor (dx/dm);
}

template <class T>
inline
T square (const T &a)
{
  return a*a;
}

template <class T>
inline
double norm2 (const T &a)
{
  return a*a;
}

template <class T>
inline
double norm (const T &a)
{
  return sqrt (norm2 (a));
}

template <class T>
inline
T sign (const T &a)
{
  if (a < 0)
    {
      return -1;
    }
  else if (a > 0)
    {
      return 1;
    }
  else
    {
      return 0;
    }
}

template<class T>
inline
T force_in_range (const T &val, const T &min_val, const T &max_val)
{
  if (val > max_val)
    {
      return max_val;
    }
  else if (val < min_val)
    {
      return min_val;
    }
  else
    {
      return val;
    }
} 

inline
vector3 project_point_on_line (const vector3 &p, const vector3 &l1, const vector3 &l2)
{
  // XXX: This is a silly implementation
  const vector3 delta = l2 - l1;
  const double t = - ((l1 - p) * delta) / norm2 (delta);
  const vector3 retval = l1 + delta * t;
  
  return retval;
}

vector3 jet (const double x);

vector3 hot (const double x);

double bessi0 (double x);

#endif // AUXIL_H