// -*- Mode: c++; c-basic-offset: 4; tab-width: 4; -*-

/******************************************************************************
 *
 *  file:  CmdLine.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_CMDLINE_H
#define TCLAP_CMDLINE_H

#include "SwitchArg.h"
#include "MultiSwitchArg.h"
#include "UnlabeledValueArg.h"
#include "UnlabeledMultiArg.h"

#include "XorHandler.h"
#include "HelpVisitor.h"
#include "VersionVisitor.h"
#include "IgnoreRestVisitor.h"

#include "CmdLineOutput.h"
#include "StdOutput.h"

#include "Constraint.h"
#include "ValuesConstraint.h"

#include <string>
#include <vector>
#include <list>
#include <iostream>
#include <iomanip>
#include <algorithm>
#include <stdlib.h> // Needed for exit(), which isn't defined in some envs.

namespace TCLAP
{

template<typename T> void DelPtr(T ptr)
{
  delete ptr;
}

template<typename C> void ClearContainer(C &c)
{
  typedef typename C::value_type value_type;
  std::for_each(c.begin(), c.end(), DelPtr<value_type>);
  c.clear();
}


/**
 * The base class that manages the command line definition and passes
 * along the parsing to the appropriate Arg classes.
 */
class CmdLine : public CmdLineInterface
{
  protected:

    /**
     * The list of arguments that will be tested against the
     * command line.
     */
    std::list<Arg*> _argList;

    /**
     * The name of the program.  Set to argv[0].
     */
    std::string _progName;

    /**
     * A message used to describe the program.  Used in the usage output.
     */
    std::string _message;

    /**
     * The version to be displayed with the --version switch.
     */
    std::string _version;

    /**
     * The number of arguments that are required to be present on
     * the command line. This is set dynamically, based on the
     * Args added to the CmdLine object.
     */
    int _numRequired;

    /**
     * The character that is used to separate the argument flag/name
     * from the value.  Defaults to ' ' (space).
     */
    char _delimiter;

    /**
     * The handler that manages xoring lists of args.
     */
    XorHandler _xorHandler;

    /**
     * A list of Args to be explicitly deleted when the destructor
     * is called.  At the moment, this only includes the three default
     * Args.
     */
    std::list<Arg*> _argDeleteOnExitList;

    /**
     * A list of Visitors to be explicitly deleted when the destructor
     * is called.  At the moment, these are the Vistors created for the
     * default Args.
     */
    std::list<Visitor*> _visitorDeleteOnExitList;

    /**
     * Object that handles all output for the CmdLine.
     */
    CmdLineOutput* _output;

    /**
     * Should CmdLine handle parsing exceptions internally?
     */
    bool _handleExceptions;

    /**
     * Throws an exception listing the missing args.
     */
    void missingArgsException();

    /**
     * Checks whether a name/flag string matches entirely matches
     * the Arg::blankChar.  Used when multiple switches are combined
     * into a single argument.
     * \param s - The message to be used in the usage.
     */
    bool _emptyCombined(const std::string& s);

    /**
     * Perform a delete ptr; operation on ptr when this object is deleted.
     */
    void deleteOnExit(Arg* ptr);

    /**
     * Perform a delete ptr; operation on ptr when this object is deleted.
     */
    void deleteOnExit(Visitor* ptr);

  private:

    /**
     * Prevent accidental copying.
     */
    CmdLine(const CmdLine& rhs);
    CmdLine& operator=(const CmdLine& rhs);

    /**
     * Encapsulates the code common to the constructors
     * (which is all of it).
     */
    void _constructor();


    /**
     * Is set to true when a user sets the output object. We use this so
     * that we don't delete objects that are created outside of this lib.
     */
    bool _userSetOutput;

    /**
     * Whether or not to automatically create help and version switches.
     */
    bool _helpAndVersion;

  public:

    /**
     * Command line constructor. Defines how the arguments will be
     * parsed.
     * \param message - The message to be used in the usage
     * output.
     * \param delimiter - The character that is used to separate
     * the argument flag/name from the value.  Defaults to ' ' (space).
     * \param version - The version number to be used in the
     * --version switch.
     * \param helpAndVersion - Whether or not to create the Help and
     * Version switches. Defaults to true.
     */
    CmdLine(const std::string& message,
            const char delimiter = ' ',
            const std::string& version = "none",
            bool helpAndVersion = true);

    /**
     * Deletes any resources allocated by a CmdLine object.
     */
    virtual ~CmdLine();

    /**
     * Adds an argument to the list of arguments to be parsed.
     * \param a - Argument to be added.
     */
    void add( Arg& a );

    /**
     * An alternative add.  Functionally identical.
     * \param a - Argument to be added.
     */
    void add( Arg* a );

    /**
     * Add two Args that will be xor'd.  If this method is used, add does
     * not need to be called.
     * \param a - Argument to be added and xor'd.
     * \param b - Argument to be added and xor'd.
     */
    void xorAdd( Arg& a, Arg& b );

    /**
     * Add a list of Args that will be xor'd.  If this method is used,
     * add does not need to be called.
     * \param xors - List of Args to be added and xor'd.
     */
    void xorAdd( std::vector<Arg*>& xors );

    /**
     * Parses the command line.
     * \param argc - Number of arguments.
     * \param argv - Array of arguments.
     */
    bool parse(int argc, const char * const * argv);

    /**
     * Parses the command line.
     * \param args - A vector of strings representing the args.
     * args[0] is still the program name.
     */
    bool parse(std::vector<std::string>& args);

    /**
     *
     */
    CmdLineOutput* getOutput();

    /**
     *
     */
    void setOutput(CmdLineOutput* co);

    /**
     *
     */
    std::string& getVersion();

    /**
     *
     */
    std::string& getProgramName();

    /**
     *
     */
    std::list<Arg*>& getArgList();

    /**
     *
     */
    XorHandler& getXorHandler();

    /**
     *
     */
    char getDelimiter();

    /**
     *
     */
    std::string& getMessage();

    /**
     *
     */
    bool hasHelpAndVersion();

    /**
     * Disables or enables CmdLine's internal parsing exception handling.
     *
     * @param state Should CmdLine handle parsing exceptions internally?
     */
    void setExceptionHandling(const bool state);

    /**
     * Returns the current state of the internal exception handling.
     *
     * @retval true Parsing exceptions are handled internally.
     * @retval false Parsing exceptions are propagated to the caller.
     */
    bool getExceptionHandling() const;

    /**
     * Allows the CmdLine object to be reused.
     */
    void reset();

};


///////////////////////////////////////////////////////////////////////////////
//Begin CmdLine.cpp
///////////////////////////////////////////////////////////////////////////////

inline CmdLine::CmdLine(const std::string& m,
                        char delim,
                        const std::string& v,
                        bool help )
  :
  _argList(std::list<Arg*>()),
  _progName("not_set_yet"),
  _message(m),
  _version(v),
  _numRequired(0),
  _delimiter(delim),
  _xorHandler(XorHandler()),
  _argDeleteOnExitList(std::list<Arg*>()),
  _visitorDeleteOnExitList(std::list<Visitor*>()),
  _output(0),
  _handleExceptions(true),
  _userSetOutput(false),
  _helpAndVersion(help)
{
  _constructor();
}

inline CmdLine::~CmdLine()
{
  ClearContainer(_argDeleteOnExitList);
  ClearContainer(_visitorDeleteOnExitList);
  if ( !_userSetOutput )
  {
    delete _output;
    _output = 0;
  }
}

inline void CmdLine::_constructor()
{
  _output = new StdOutput;
  Arg::setDelimiter( _delimiter );
  Visitor* v;
  if ( _helpAndVersion )
  {
    v = new HelpVisitor( this, &_output );
    SwitchArg* help = new SwitchArg("h","help",
                                    "Displays usage information and exits.",
                                    false, v);
    add( help );
    deleteOnExit(help);
    deleteOnExit(v);
    v = new VersionVisitor( this, &_output );
    SwitchArg* vers = new SwitchArg("","version",
                                    "Displays version information and exits.",
                                    false, v);
    add( vers );
    deleteOnExit(vers);
    deleteOnExit(v);
  }
  v = new IgnoreRestVisitor();
  SwitchArg* ignore  = new SwitchArg(Arg::flagStartString(),
                                     Arg::ignoreNameString(),
                                     "Ignores the rest of the labeled arguments following this flag.",
                                     false, v);
  add( ignore );
  deleteOnExit(ignore);
  deleteOnExit(v);
}

inline void CmdLine::xorAdd( std::vector<Arg*>& ors )
{
  _xorHandler.add( ors );
  for (ArgVectorIterator it = ors.begin(); it != ors.end(); it++)
  {
    (*it)->forceRequired();
    (*it)->setRequireLabel( "OR required" );
    add( *it );
  }
}

inline void CmdLine::xorAdd( Arg& a, Arg& b )
{
  std::vector<Arg*> ors;
  ors.push_back( &a );
  ors.push_back( &b );
  xorAdd( ors );
}

inline void CmdLine::add( Arg& a )
{
  add( &a );
}

inline void CmdLine::add( Arg* a )
{
  for( ArgListIterator it = _argList.begin(); it != _argList.end(); it++ )
    if ( *a == *(*it) )
      throw( SpecificationException(
               "Argument with same flag/name already exists!",
               a->longID() ) );
  a->addToList( _argList );
  if ( a->isRequired() )
    _numRequired++;
}


inline bool CmdLine::parse(int argc, const char * const * argv)
{
  // this step is necessary so that we have easy access to
  // mutable strings.
  std::vector<std::string> args;
  for (int i = 0; i < argc; i++)
    args.push_back(argv[i]);
  return parse(args);
}

inline bool CmdLine::parse(std::vector<std::string>& args)
{
  bool shouldExit = false;
  int estat = 0;
  try
  {
    _progName = args.front();
    args.erase(args.begin());
    int requiredCount = 0;
    for (int i = 0; static_cast<unsigned int>(i) < args.size(); i++)
    {
      bool matched = false;
      for (ArgListIterator it = _argList.begin();
           it != _argList.end(); it++)
      {
        if ( (*it)->processArg( &i, args ) )
        {
          requiredCount += _xorHandler.check( *it );
          matched = true;
          break;
        }
      }
      // checks to see if the argument is an empty combined
      // switch and if so, then we've actually matched it
      if ( !matched && _emptyCombined( args[i] ) )
        matched = true;
      if ( !matched && !Arg::ignoreRest() )
        throw(CmdLineParseException("Couldn't find match "
                                    "for argument",
                                    args[i]));
    }
    if ( requiredCount < _numRequired )
      missingArgsException();
    if ( requiredCount > _numRequired )
      throw(CmdLineParseException("Too many arguments!"));
  }
  catch ( ArgException& e )
  {
    // If we're not handling the exceptions, rethrow.
    if ( !_handleExceptions)
    {
      throw;
    }
    try
    {
      _output->failure(*this,e);
    }
    catch ( ExitException &ee )
    {
      estat = ee.getExitStatus();
      shouldExit = true;
    }
  }
  catch (ExitException &ee)
  {
    // If we're not handling the exceptions, rethrow.
    if ( !_handleExceptions)
    {
      throw;
    }
    estat = ee.getExitStatus();
    shouldExit = true;
  }
  if (shouldExit)
  {
    //exit(estat);
    return false;
  }

  return true;
}

inline bool CmdLine::_emptyCombined(const std::string& s)
{
  if ( s.length() > 0 && s[0] != Arg::flagStartChar() )
    return false;
  for ( int i = 1; static_cast<unsigned int>(i) < s.length(); i++ )
    if ( s[i] != Arg::blankChar() )
      return false;
  return true;
}

inline void CmdLine::missingArgsException()
{
  int count = 0;
  std::string missingArgList;
  for (ArgListIterator it = _argList.begin(); it != _argList.end(); it++)
  {
    if ( (*it)->isRequired() && !(*it)->isSet() )
    {
      missingArgList += (*it)->getName();
      missingArgList += ", ";
      count++;
    }
  }
  missingArgList = missingArgList.substr(0,missingArgList.length()-2);
  std::string msg;
  if ( count > 1 )
    msg = "Required arguments missing: ";
  else
    msg = "Required argument missing: ";
  msg += missingArgList;
  throw(CmdLineParseException(msg));
}

inline void CmdLine::deleteOnExit(Arg* ptr)
{
  _argDeleteOnExitList.push_back(ptr);
}

inline void CmdLine::deleteOnExit(Visitor* ptr)
{
  _visitorDeleteOnExitList.push_back(ptr);
}

inline CmdLineOutput* CmdLine::getOutput()
{
  return _output;
}

inline void CmdLine::setOutput(CmdLineOutput* co)
{
  if ( !_userSetOutput )
    delete _output;
  _userSetOutput = true;
  _output = co;
}

inline std::string& CmdLine::getVersion()
{
  return _version;
}

inline std::string& CmdLine::getProgramName()
{
  return _progName;
}

inline std::list<Arg*>& CmdLine::getArgList()
{
  return _argList;
}

inline XorHandler& CmdLine::getXorHandler()
{
  return _xorHandler;
}

inline char CmdLine::getDelimiter()
{
  return _delimiter;
}

inline std::string& CmdLine::getMessage()
{
  return _message;
}

inline bool CmdLine::hasHelpAndVersion()
{
  return _helpAndVersion;
}

inline void CmdLine::setExceptionHandling(const bool state)
{
  _handleExceptions = state;
}

inline bool CmdLine::getExceptionHandling() const
{
  return _handleExceptions;
}

inline void CmdLine::reset()
{
  for( ArgListIterator it = _argList.begin(); it != _argList.end(); it++ )
    (*it)->reset();
  _progName.clear();
}

///////////////////////////////////////////////////////////////////////////////
//End CmdLine.cpp
///////////////////////////////////////////////////////////////////////////////



} //namespace TCLAP
#endif