/*=========================================================================

  Program:   KWSys - Kitware System Library
  Module:    $RCSfile$

  Copyright (c) Kitware, Inc., Insight Consortium.  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#ifndef @KWSYS_NAMESPACE@_CommandLineArguments_hxx
#define @KWSYS_NAMESPACE@_CommandLineArguments_hxx

#include <@KWSYS_NAMESPACE@/Configure.h>
#include <@KWSYS_NAMESPACE@/Configure.hxx>

#include <@KWSYS_NAMESPACE@/stl/string>

/* Define this macro temporarily to keep the code readable.  */
#if !defined (KWSYS_NAMESPACE) && !@KWSYS_NAMESPACE@_NAME_IS_KWSYS
# define kwsys_stl @KWSYS_NAMESPACE@_stl
#endif

namespace @KWSYS_NAMESPACE@
{

class CommandLineArgumentsInternal;

/** \class CommandLineArguments
 * \brief Command line arguments processing code.
 *
 * Find specified arguments with optional options and execute specified methods
 * or set given variables.
 */

class @KWSYS_NAMESPACE@_EXPORT CommandLineArguments
{
public:
  CommandLineArguments();
  ~CommandLineArguments();

  /**
   * Various argument types.
   */
  enum ArgumentTypeEnum { 
    NO_ARGUMENT,    // The option takes no argument             --foo
    CONCAT_ARGUMENT,// The option takes argument after no space --foobar
    SPACE_ARGUMENT, // The option takes argument after space    --foo bar
    EQUAL_ARGUMENT  // The option takes argument after equal    --foo=bar
  };

  /**
   * Various string types.
   */
  enum VariableTypeEnum {
    NO_VARIABLE_TYPE = 0, // The variable is not specified
    INT_TYPE,             // The variable is integer (int)
    BOOL_TYPE,            // The vairable is boolean (bool)
    DOUBLE_TYPE,          // The variable is float (double)
    STRING_TYPE,          // The variable is string (char*)
    STL_STRING_TYPE       // The variable is string (char*)
  };

  /**
   * Prototypes for callbacks for callback interface.
   */
  typedef int(*CallbackType)(const char* argument, const char* value, 
    void* call_data);
  typedef int(*ErrorCallbackType)(const char* argument, void* client_data);

  struct CallbackStructure
    {
    const char* Argument;
    int ArgumentType;
    CallbackType Callback;
    void* CallData;
    void* Variable;
    int VariableType;
    const char* Help;
    };
 
  /**
   * Initialize internal data structures. This should be called before parsing.
   */
  void Initialize(int argc, const char* const argv[]);

  /**
   * Initialize internal data structure and pass arguments one by one. This is
   * convinience method for use from scripting languages where argc and argv
   * are not available.
   */
  void Initialize();
  void ProcessArgument(const char* arg);

  /**
   * This method will parse arguments and call apropriate methods. 
   */
  int Parse();

  /**
   * This method will add a callback for a specific argument. The arguments to
   * it are argument, argument type, callback method, and call data. The
   * argument help specifies the help string used with this option. The
   * callback and call_data can be skipped.
   */
  void AddCallback(const char* argument, ArgumentTypeEnum type, CallbackType callback, 
                   void* call_data, const char* help);

  /**
   * Add handler for argument which is going to set the variable to the
   * specified value.
   */
  void AddArgument(const char* argument, ArgumentTypeEnum type, VariableTypeEnum vtype, void* variable, const char* help);
  void AddArgument(const char* argument, ArgumentTypeEnum type, bool* variable, const char* help);
  void AddArgument(const char* argument, ArgumentTypeEnum type, int* variable, const char* help);
  void AddArgument(const char* argument, ArgumentTypeEnum type, double* variable, const char* help);
  void AddArgument(const char* argument, ArgumentTypeEnum type, char** variable, const char* help);
  void AddArgument(const char* argument, ArgumentTypeEnum type, kwsys_stl::string* variable, const char* help);
  void AddBooleanArgument(const char* argument, bool* variable, const char* help);
  void AddBooleanArgument(const char* argument, int* variable, const char* help);

  /**
   * Set the callbacks for error handling.
   */
  void SetClientData(void* client_data);
  void SetUnknownArgumentCallback(ErrorCallbackType callback);

  /**
   * Get remaining arguments. It allocates space for argv, so you have to call
   * delete[] on it.
   */
  void GetRemainingArguments(int* argc, char*** argv);

  /**
   * Return string containing help. If the argument is specified, only return
   * help for that argument.
   */
  const char* GetHelp() { return this->Help.c_str(); }
  const char* GetHelp(const char* arg);

  /**
   * Get / Set the help line length. Default length is 80.
   */
  void SetLineLength();
  unsigned int GetLineLength();

protected:

  void GenerateHelp();

  typedef CommandLineArgumentsInternal Internal;
  Internal* Internals;
  kwsys_stl::string Help;

  unsigned int LineLength;
};

} // namespace @KWSYS_NAMESPACE@

/* Undefine temporary macro.  */
#if !defined (KWSYS_NAMESPACE) && !@KWSYS_NAMESPACE@_NAME_IS_KWSYS
# undef kwsys_stl
#endif

#endif