/*!
   \file commLineOptions.h

   \brief Command line class for c++ code

*/

#ifndef COMMLINEOPTIONS_H
#define COMMLINEOPTIONS_H

#include <iostream>
#include <fstream>
#include <stdlib.h>
#include <string.h>

#define COMMON_OPT 1
#define COMMAND_OPT 2
#define FILE_OPT 3
#define COMMON_FLAG 4
#define COMMAND_FLAG 5
#define FILE_FLAG 6

#define COMMAND_OPTION_TYPE  1
#define COMMAND_FLAG_TYPE 2
#define FILE_OPTION_TYPE  3
#define FILE_FLAG_TYPE 4 
#define UNKNOWN_TYPE  5

#define DEFAULT_MAXOPTS  10
#define MAX_LONG_PREFIX_LENGTH  2

#define DEFAULT_MAXUSAGE 3
#define DEFAULT_MAXHELP  10

#define TRUE_FLAG "true" 

class commLineOptions 
{

public: /* the public interface */
    commLineOptions();
    commLineOptions(int maxoptions ); 
    commLineOptions(int maxoptions , int maxcharoptions); 
    ~commLineOptions();

    /*
     * following set methods specifies the  
     * special characters and delimiters 
     * if not set traditional defaults will be used
     */

    void setCommandPrefixChar( char _prefix );   /* '-' in "-w" */
    void setCommandLongPrefix( char *_prefix );  /* '--' in "--width" */
    void setFileCommentChar( char _comment );    /* '#' in shellscripts */
    void setFileDelimiterChar( char _delimiter );/* ':' in "width : 100" */

    /* 
     * provide the input for the options
     * like argv[] for commndline and the 
     * option file name  to use;
     */
    void useCommandArgs( int _argc, char **_argv );
    void useFiileName( const char *_filename );

    /* 
     * turn off the POSIX style options 
     * this means anything starting with a '-' or "--"
     * will be considered a valid option 
     * which alo means you cannot add a bunch of 
     * POIX options chars together like "-lr"  for "-l -r"
     * 
     */

    void noPOSIX();

    /*
     * prints warning verbose if you set anything wrong 
     */
    void setVerbose();

    /* 
     * there are two types of options  
     *
     * Option - has an associated value ( -w 100 )
     * Flag  - no value, just a boolean flag  ( -nogui )
     * 
     * the options can be either a string ( GNU style )
     * or a character ( traditional POSIX style ) 
     * or both ( --width, -w )
     *
     * the options can be common to the commandline and 
     * the optionfile, or can belong only to either of 
     * commandline and optionfile
     *
     * following set methods, handle all the aboove 
     * cases of options.
     */

    /* options comman to command line and option file */
    void setOption( const char *opt_string );
    void setOption( char  opt_char );
    void setOption( const char *opt_string , char opt_char );
    void setFlag( const char *opt_string );
    void setFlag( char  opt_char );
    void setFlag( const char *opt_string , char opt_char );

    /* options read from commandline only */
    void setCommandOption( const char *opt_string );
    void setCommandOption( char  opt_char );
    void setCommandOption( const char *opt_string , char opt_char );
    void setCommandFlag( const char *opt_string );
    void setCommandFlag( char  opt_char );
    void setCommandFlag( const char *opt_string , char opt_char );

    /* options read from an option file only  */
    void setFileOption( const char *opt_string );
    void setFileOption( char  opt_char );
    void setFileOption( const char *opt_string , char opt_char );
    void setFileFlag( const char *opt_string );
    void setFileFlag( char  opt_char );
    void setFileFlag( const char *opt_string , char opt_char );

    /*
     * process the options, registerd using 
     * useCommandArgs() and useFileName();
     */
    void processOptions();  
    void processCommandArgs();
    void processCommandArgs( int max_args );
    bool processFile();

    /*
     * process the specified options 
     */
    void processCommandArgs( int _argc, char **_argv );
    void processCommandArgs( int _argc, char **_argv, int max_args );
    bool processFile( const char *_filename );

    /*
     * get the value of the options 
     * will return NULL if no value is set 
     */
    char *getValue( const char *_option );
    bool  getFlag( const char *_option );
    char *getValue( char _optchar );
    bool  getFlag( char _optchar );

    /*
     * Print Usage
     */
    void printUsage();
    void addUsage( const char *line );
    void printHelp();
    void noUsage();
    void usageOn();

    /*
     * get the argument count and arguments sans the options
     */
    int getArgc();
    char* getArgv( int index );

protected: /* the hidden data structure */
    int argc; /* commandline arg count  */
    char **argv; /* commndline args */
    const char* filename; /* the option file */
    char* appname; /* the application name from argv[0] */

    int *new_argv; /* arguments sans options (index to argv) */
    int new_argc; /* argument count sans the options */
    int max_legal_args; /* ignore extra arguments */

    /* option strings storage + indexing */
    int max_options;  /* maximum number of options */
    const char **options; /* storage */
    int *optiontype;  /* type - common, command, file */
    int *optionindex; /* index into value storage */
    int option_counter; /* counter for added options  */

    /* option chars storage + indexing */
    int max_char_options;  /* maximum number options */
    char *optionchars; /*  storage */
    int *optchartype; /* type - common, command, file */
    int *optcharindex; /* index into value storage */
    int optchar_counter; /* counter for added options  */

    /* values */
    char **values; /* common value storage */
    int g_value_counter; /* globally updated value index LAME! */

    /* help and usage */
    const char **usage; /* usage */
    int max_usage_lines; /* max usage lines reseverd */
    int usage_lines; /* number of usage lines */

    bool command_set;/* if argc/argv were provided */
    bool file_set; /* if a filename was provided */
    bool mem_allocated; /* if memory allocated in init() */
    bool posix_style;  /* enables to turn off POSIX style options */
    bool verbose; /* silent|verbose */
    bool print_usage; /* usage verbose */
    bool print_help; /* help verbose */

    char opt_prefix_char; /*  '-' in "-w" */
    char long_opt_prefix[MAX_LONG_PREFIX_LENGTH]; /* '--' in "--width" */
    char file_delimiter_char;/* ':' in width : 100 */
    char file_comment_char; /*  '#' in "#this is a comment" */
    char equalsign;
    char comment;
    char delimiter;
    char endofline;
    char whitespace;
    char nullterminate;

    bool set;   //was static member
    bool once;  //was static member

protected: /* the hidden utils */
    void init();
    void init(int maxopt, int maxcharopt );	
    bool alloc();
    void cleanup();
    bool valueStoreOK();

    /* grow storage arrays as required */
    bool doubleOptStorage();
    bool doubleCharStorage();
    bool doubleUsageStorage();

    bool setValue( const char *option , char *value );
    bool setFlagOn( const char *option );
    bool setValue( char optchar , char *value);
    bool setFlagOn( char optchar );

    void addOption( const char* option , int type );
    void addOption( char optchar , int type );
    void addOptionError( const char *opt);
    void addOptionError( char opt);
    bool findFlag( char* value );
    void addUsageError( const char *line );
    bool CommandSet();
    bool FileSet();
    bool POSIX();
    bool USAGE();

    char parsePOSIX( char* arg );
    int parseGNU( char *arg );
    bool matchChar( char c );
    int matchOpt( char *opt );

    /* dot file methods */
    char *readFile();
    char *readFile( const char* fname );
    bool consumeFile( char *buffer );
    void processLine( char *theline, int length );
    char *chomp( char *str );
    void valuePairs( char *type, char *value ); 
    void justValue( char *value );

    void printVerbose( const char *msg );
    void printVerbose( char *msg );
    void printVerbose( char ch );
    void printVerbose( );
};

#endif // COMMLINEOPTIONS_H