/******************************************************************************
 *
 *  file:  XorHandler.h
 *
 *  Copyright (c) 2003, Michael E. Smoot .
 *  Copyright (c) 2004, Michael E. Smoot, Daniel Aarno.
 *  All rights reverved.
 *
 *  See the file COPYING in the top directory of this distribution for
 *  more information.
 *
 *  THE SOFTWARE IS PROVIDED _AS IS_, WITHOUT WARRANTY OF ANY KIND, EXPRESS
 *  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 *  DEALINGS IN THE SOFTWARE.
 *
 *****************************************************************************/

#ifndef TCLAP_XORHANDLER_H
#define TCLAP_XORHANDLER_H

#include "Arg.h"
#include <string>
#include <vector>
#include <algorithm>
#include <iostream>

namespace TCLAP
{

/**
 * This class handles lists of Arg's that are to be XOR'd on the command
 * line.  This is used by CmdLine and you shouldn't ever use it.
 */
class XorHandler
{
  protected:

    /**
     * The list of of lists of Arg's to be or'd together.
     */
    std::vector< std::vector<Arg*> > _orList;

  public:

    /**
     * Constructor.  Does nothing.
     */
    XorHandler( ) : _orList(std::vector< std::vector<Arg*> >()) {}

    /**
     * Add a list of Arg*'s that will be orred together.
     * \param ors - list of Arg* that will be xor'd.
     */
    void add( std::vector<Arg*>& ors );

    /**
     * Checks whether the specified Arg is in one of the xor lists and
     * if it does match one, returns the size of the xor list that the
     * Arg matched.  If the Arg matches, then it also sets the rest of
     * the Arg's in the list. You shouldn't use this.
     * \param a - The Arg to be checked.
     */
    int check( const Arg* a );

    /**
     * Returns the XOR specific short usage.
     */
    std::string shortUsage();

    /**
     * Prints the XOR specific long usage.
     * \param os - Stream to print to.
     */
    void printLongUsage(std::ostream& os);

    /**
     * Simply checks whether the Arg is contained in one of the arg
     * lists.
     * \param a - The Arg to be checked.
     */
    bool contains( const Arg* a );

    std::vector< std::vector<Arg*> >& getXorList();

};


//////////////////////////////////////////////////////////////////////
//BEGIN XOR.cpp
//////////////////////////////////////////////////////////////////////
inline void XorHandler::add( std::vector<Arg*>& ors )
{
  _orList.push_back( ors );
}

inline int XorHandler::check( const Arg* a )
{
  // iterate over each XOR list
  for ( int i = 0; static_cast<unsigned int>(i) < _orList.size(); i++ )
  {
    // if the XOR list contains the arg..
    ArgVectorIterator ait = std::find( _orList[i].begin(),
                                       _orList[i].end(), a );
    if ( ait != _orList[i].end() )
    {
      // first check to see if a mutually exclusive switch
      // has not already been set
      for ( ArgVectorIterator it = _orList[i].begin();
            it != _orList[i].end();
            it++ )
        if ( a != (*it) && (*it)->isSet() )
          throw(CmdLineParseException(
                  "Mutually exclusive argument already set!",
                  (*it)->toString()));
      // go through and set each arg that is not a
      for ( ArgVectorIterator it = _orList[i].begin();
            it != _orList[i].end();
            it++ )
        if ( a != (*it) )
          (*it)->xorSet();
      // return the number of required args that have now been set
      if ( (*ait)->allowMore() )
        return 0;
      else
        return static_cast<int>(_orList[i].size());
    }
  }
  if ( a->isRequired() )
    return 1;
  else
    return 0;
}

inline bool XorHandler::contains( const Arg* a )
{
  for ( int i = 0; static_cast<unsigned int>(i) < _orList.size(); i++ )
    for ( ArgVectorIterator it = _orList[i].begin();
          it != _orList[i].end();
          it++ )
      if ( a == (*it) )
        return true;
  return false;
}

inline std::vector< std::vector<Arg*> >& XorHandler::getXorList()
{
  return _orList;
}



//////////////////////////////////////////////////////////////////////
//END XOR.cpp
//////////////////////////////////////////////////////////////////////

} //namespace TCLAP

#endif