/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          https://www.mrpt.org/                         |
   |                                                                        |
   | Copyright (c) 2005-2022, Individual contributors, see AUTHORS file     |
   | See: https://www.mrpt.org/Authors - All rights reserved.               |
   | Released under BSD License. See: https://www.mrpt.org/License          |
   +------------------------------------------------------------------------+ */

/******************************************************************************
 *
 *  file:  UnlabeledValueArg.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.
 *
 *****************************************************************************/


#pragma once

#include <string>
#include <vector>

#include <mrpt/3rdparty/tclap/ValueArg.h>
#include <mrpt/3rdparty/tclap/OptionalUnlabeledTracker.h>

namespace TCLAP {

/**
 * The basic unlabeled argument that parses a value.
 * This is a template class, which means the type T defines the type
 * that a given object will attempt to parse when an UnlabeledValueArg
 * is reached in the list of args that the CmdLine iterates over.
 */
template<class T>
class UnlabeledValueArg : public ValueArg<T>
{

	// If compiler has two stage name lookup (as gcc >= 3.4 does)
	// this is requried to prevent undef. symbols
	using ValueArg<T>::_ignoreable;
	using ValueArg<T>::_hasBlanks;
	using ValueArg<T>::_extractValue;
	using ValueArg<T>::_typeDesc;
	using ValueArg<T>::_name;
	using ValueArg<T>::_description;
	using ValueArg<T>::_alreadySet;
	using ValueArg<T>::toString;

	public:

		/**
		 * UnlabeledValueArg constructor.
		 * \param name - A one word name for the argument.  Can be
		 * used as a long flag on the command line.
		 * \param desc - A description of what the argument is for or
		 * does.
		 * \param req - Whether the argument is required on the command
		 * line.
		 * \param value - The default value assigned to this argument if it
		 * is not present on the command line.
		 * \param typeDesc - A short, human readable description of the
		 * type that this object expects.  This is used in the generation
		 * of the USAGE statement.  The goal is to be helpful to the end user
		 * of the program.
		 * \param ignoreable - Allows you to specify that this argument can be
		 * ignored if the '--' flag is set.  This defaults to false (cannot
		 * be ignored) and should  generally stay that way unless you have
		 * some special need for certain arguments to be ignored.
		 * \param v - Optional Vistor.  You should leave this blank unless
		 * you have a very good reason.
		 */
		UnlabeledValueArg( const std::string& name,
			               const std::string& desc,
						   bool req,
				           T value,
				           const std::string& typeDesc,
						   bool ignoreable = false,
                                           Visitor* v = nullptr);

		/**
		 * UnlabeledValueArg constructor.
		 * \param name - A one word name for the argument.  Can be
		 * used as a long flag on the command line.
		 * \param desc - A description of what the argument is for or
		 * does.
		 * \param req - Whether the argument is required on the command
		 * line.
		 * \param value - The default value assigned to this argument if it
		 * is not present on the command line.
		 * \param typeDesc - A short, human readable description of the
		 * type that this object expects.  This is used in the generation
		 * of the USAGE statement.  The goal is to be helpful to the end user
		 * of the program.
		 * \param parser - A CmdLine parser object to add this Arg to
		 * \param ignoreable - Allows you to specify that this argument can be
		 * ignored if the '--' flag is set.  This defaults to false (cannot
		 * be ignored) and should  generally stay that way unless you have
		 * some special need for certain arguments to be ignored.
		 * \param v - Optional Vistor.  You should leave this blank unless
		 * you have a very good reason.
		 */
		UnlabeledValueArg( const std::string& name,
			               const std::string& desc,
						   bool req,
				           T value,
				           const std::string& typeDesc,
						   CmdLineInterface& parser,
						   bool ignoreable = false,
                                           Visitor* v = nullptr );

		/**
		 * UnlabeledValueArg constructor.
		 * \param name - A one word name for the argument.  Can be
		 * used as a long flag on the command line.
		 * \param desc - A description of what the argument is for or
		 * does.
		 * \param req - Whether the argument is required on the command
		 * line.
		 * \param value - The default value assigned to this argument if it
		 * is not present on the command line.
		 * \param constraint - A pointer to a Constraint object used
		 * to constrain this Arg.
		 * \param ignoreable - Allows you to specify that this argument can be
		 * ignored if the '--' flag is set.  This defaults to false (cannot
		 * be ignored) and should  generally stay that way unless you have
		 * some special need for certain arguments to be ignored.
		 * \param v - Optional Vistor.  You should leave this blank unless
		 * you have a very good reason.
		 */
		UnlabeledValueArg( const std::string& name,
			               const std::string& desc,
						   bool req,
				           T value,
				           Constraint<T>* constraint,
						   bool ignoreable = false,
                                           Visitor* v = nullptr );


		/**
		 * UnlabeledValueArg constructor.
		 * \param name - A one word name for the argument.  Can be
		 * used as a long flag on the command line.
		 * \param desc - A description of what the argument is for or
		 * does.
		 * \param req - Whether the argument is required on the command
		 * line.
		 * \param value - The default value assigned to this argument if it
		 * is not present on the command line.
		 * \param constraint - A pointer to a Constraint object used
		 * to constrain this Arg.
		 * \param parser - A CmdLine parser object to add this Arg to
		 * \param ignoreable - Allows you to specify that this argument can be
		 * ignored if the '--' flag is set.  This defaults to false (cannot
		 * be ignored) and should  generally stay that way unless you have
		 * some special need for certain arguments to be ignored.
		 * \param v - Optional Vistor.  You should leave this blank unless
		 * you have a very good reason.
		 */
		UnlabeledValueArg( const std::string& name,
			               const std::string& desc,
						   bool req,
				           T value,
				           Constraint<T>* constraint,
						   CmdLineInterface& parser,
						   bool ignoreable = false,
                                           Visitor* v = nullptr);

		/**
		 * Handles the processing of the argument.
		 * This re-implements the Arg version of this method to set the
		 * _value of the argument appropriately.  Handling specific to
		 * unlabled arguments.
		 * \param i - Pointer the the current argument in the list.
		 * \param args - Mutable list of strings.
		 */
		virtual bool processArg(int* i, std::vector<std::string>& args);

		/**
		 * Overrides shortID for specific behavior.
		 */
		virtual std::string shortID(const std::string& val="val") const;

		/**
		 * Overrides longID for specific behavior.
		 */
		virtual std::string longID(const std::string& val="val") const;

		/**
		 * Overrides operator== for specific behavior.
		 */
		virtual bool operator==(const Arg& a ) const;

		/**
		 * Instead of pushing to the front of list, push to the back.
		 * \param argList - The list to add this to.
		 */
		virtual void addToList( std::list<Arg*>& argList ) const;

};

/**
 * Constructor implemenation.
 */
template<class T>
UnlabeledValueArg<T>::UnlabeledValueArg(const std::string& name,
					                    const std::string& desc,
										bool req,
					                    T val,
					                    const std::string& typeDesc,
					                    bool ignoreable,
					                    Visitor* v)
: ValueArg<T>("", name, desc, req, val, typeDesc, v)
{
	_ignoreable = ignoreable;

	OptionalUnlabeledTracker<int>::check(req, toString());

}

template<class T>
UnlabeledValueArg<T>::UnlabeledValueArg(const std::string& name,
					                    const std::string& desc,
										bool req,
					                    T val,
					                    const std::string& typeDesc,
					                    CmdLineInterface& parser,
					                    bool ignoreable,
					                    Visitor* v)
: ValueArg<T>("", name, desc, req, val, typeDesc, v)
{
	_ignoreable = ignoreable;
	OptionalUnlabeledTracker<int>::check(req, toString());
	parser.add( this );
}

/**
 * Constructor implemenation.
 */
template<class T>
UnlabeledValueArg<T>::UnlabeledValueArg(const std::string& name,
                                        const std::string& desc,
										bool req,
                                        T val,
                                        Constraint<T>* constraint,
                                        bool ignoreable,
                                        Visitor* v)
: ValueArg<T>("", name, desc, req, val, constraint, v)
{
	_ignoreable = ignoreable;
	OptionalUnlabeledTracker<int>::check(req, toString());
}

template<class T>
UnlabeledValueArg<T>::UnlabeledValueArg(const std::string& name,
					                    const std::string& desc,
										bool req,
					                    T val,
					                    Constraint<T>* constraint,
					                    CmdLineInterface& parser,
					                    bool ignoreable,
					                    Visitor* v)
: ValueArg<T>("", name, desc, req, val, constraint,  v)
{
	_ignoreable = ignoreable;
	OptionalUnlabeledTracker<int>::check(req, toString());
	parser.add( this );
}

/**
 * Implementation of processArg().
 */
template<class T>
bool UnlabeledValueArg<T>::processArg(int *i, std::vector<std::string>& args)
{

	if ( _alreadySet )
		return false;

	if ( _hasBlanks( args[*i] ) )
		return false;

	// never ignore an unlabeled arg

	_extractValue( args[*i] );
	_alreadySet = true;
	return true;
}

/**
 * Overriding shortID for specific output.
 */
template<class T>
std::string UnlabeledValueArg<T>::shortID(const std::string& val) const
{
	std::string id = "<" + _typeDesc + ">";

	return id;
}

/**
 * Overriding longID for specific output.
 */
template<class T>
std::string UnlabeledValueArg<T>::longID(const std::string& val) const
{
	// Ideally we would like to be able to use RTTI to return the name
	// of the type required for this argument.  However, g++ at least,
	// doesn't appear to return terribly useful "names" of the types.
	std::string id = "<" + _typeDesc + ">";

	return id;
}

/**
 * Overriding operator== for specific behavior.
 */
template<class T>
bool UnlabeledValueArg<T>::operator==(const Arg& a ) const
{
	if ( _name == a.getName() || _description == a.getDescription() )
		return true;
	else
		return false;
}

template<class T>
void UnlabeledValueArg<T>::addToList( std::list<Arg*>& argList ) const
{
	argList.push_back( const_cast<Arg*>(static_cast<const Arg* const>(this)) );
}

}
