/******************************************************************************
 *
 *  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 <tclap/SwitchArg.h>
#include <tclap/MultiSwitchArg.h>
#include <tclap/UnlabeledValueArg.h>
#include <tclap/UnlabeledMultiArg.h>

#include <tclap/XorHandler.h>
#include <tclap/HelpVisitor.h>
#include <tclap/VersionVisitor.h>
#include <tclap/IgnoreRestVisitor.h>

#include <tclap/CmdLineOutput.h>
#include <tclap/StdOutput.h>

#include <tclap/Constraint.h>
#include <tclap/ValuesConstraint.h>

#include <string>
#include <vector>
#include <list>
#include <iostream>
#include <iomanip>
#include <algorithm>
#include <cstdlib> // 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:
			/**
			 * 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.
			 */
			void 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.
			 */
			void 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();
	};

	inline CmdLine::CmdLine(const std::string &m, char delim, const std::string &v, bool help) :
			_progName("not_set_yet"), _message(m), _version(v), _numRequired(0), _delimiter(delim),
			_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 void 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]);
		}

		parse(args);
	}

	inline void 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);
		}
	}

	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)
	{
		_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();
	}
}

#endif