/****************************************************************************
 * Copyright (c) 1998 Free Software Foundation, Inc.                        *
 *                                                                          *
 * Permission is hereby granted, free of charge, to any person obtaining a  *
 * copy of this software and associated documentation files (the            *
 * "Software"), to deal in the Software without restriction, including      *
 * without limitation the rights to use, copy, modify, merge, publish,      *
 * distribute, distribute with modifications, sublicense, and/or sell       *
 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
 *                                                                          *
 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
 *                                                                          *
 * 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 ABOVE 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.                               *
 *                                                                          *
 * Except as contained in this notice, the name(s) of the above copyright   *
 * holders shall not be used in advertising or otherwise to promote the     *
 * sale, use or other dealings in this Software without prior written       *
 * authorization.                                                           *
 ****************************************************************************/

/****************************************************************************
 *   Author: Juergen Pfeifer <Juergen.Pfeifer@T-Online.de> 1995,1997        *
 ****************************************************************************/

#ifndef FORM_H
#define FORM_H

#include <curses.h>
#include <eti.h>

#ifdef __cplusplus
  extern "C" {
#endif

typedef int Form_Options;
typedef int Field_Options;

	/**********
	*  _PAGE  *
	**********/

typedef struct {
  short	pmin;	  /* index of first field on page            */
  short	pmax;	  /* index of last field on page             */
  short	smin;	  /* index of top leftmost field on page     */
  short	smax;	  /* index of bottom rightmost field on page */
} _PAGE;

	/**********
	*  FIELD  *
	**********/

typedef struct fieldnode {
  unsigned short       	status;	  /* flags		        */
  short			rows;	  /* size in rows		*/
  short			cols;	  /* size in cols		*/
  short			frow;	  /* first row		        */
  short			fcol;	  /* first col		        */
  int                   drows;    /* dynamic rows               */
  int                   dcols;    /* dynamic cols               */
  int                   maxgrow;  /* maximum field growth       */
  int			nrow;	  /* offscreen rows	        */
  short			nbuf;	  /* additional buffers	        */
  short			just;	  /* justification	        */
  short			page;	  /* page on form		*/
  short			index;	  /* into form -> field	        */
  int			pad;	  /* pad character	        */
  chtype		fore;	  /* foreground attribute	*/
  chtype		back;	  /* background attribute	*/
  Field_Options		opts;	  /* options		        */
  struct fieldnode *	snext;	  /* sorted order pointer	*/
  struct fieldnode *	sprev;	  /* sorted order pointer	*/
  struct fieldnode *	link;	  /* linked field chain	        */
  struct formnode *	form;	  /* containing form	        */
  struct typenode *	type;	  /* field type		        */
  void *		arg;	  /* argument for type	        */
  char *		buf;	  /* field buffers	        */
  void *		usrptr;	  /* user pointer		*/
} FIELD;

	/**************
	*  FIELDTYPE  *
	**************/

typedef struct typenode {
  unsigned short	status;	               /* flags		       */
  long			ref;	               /* reference count      */
  struct typenode *	left;	               /* ptr to operand for | */
  struct typenode *	right;	               /* ptr to operand for | */

  void* (*makearg)(va_list *);                 /* make fieldtype arg   */
  void* (*copyarg)(const void *);              /* copy fieldtype arg   */
  void  (*freearg)(void *);                    /* free fieldtype arg   */

  bool	(*fcheck)(FIELD *,const void *);       /* field validation     */
  bool	(*ccheck)(int,const void *);           /* character validation */

  bool	(*next)(FIELD *,const void *);         /* enumerate next value */
  bool	(*prev)(FIELD *,const void *);         /* enumerate prev value */

} FIELDTYPE;

	/*********
	*  FORM  *
	*********/

typedef struct formnode {
  unsigned short	status;	  /* flags		        */
  short			rows;	  /* size in rows		*/
  short			cols;	  /* size in cols		*/
  int			currow;	  /* current row in field window*/
  int			curcol;	  /* current col in field window*/
  int			toprow;	  /* in scrollable field window	*/
  int                   begincol; /* in horiz. scrollable field */
  short			maxfield; /* number of fields	        */
  short			maxpage;  /* number of pages	        */
  short			curpage;  /* index into page	        */
  Form_Options		opts;	  /* options		        */
  WINDOW *		win;	  /* window		        */
  WINDOW *		sub;	  /* subwindow		        */
  WINDOW *		w;	  /* window for current field	*/
  FIELD **		field;	  /* field [maxfield]	        */
  FIELD *		current;  /* current field	        */
  _PAGE *		page;	  /* page [maxpage]	        */
  void *		usrptr;	  /* user pointer		*/

  void                  (*forminit)(struct formnode *);
  void                  (*formterm)(struct formnode *);
  void                  (*fieldinit)(struct formnode *);
  void                  (*fieldterm)(struct formnode *);

} FORM;

typedef void (*Form_Hook)(FORM *);

	/***************************
	*  miscellaneous #defines  *
	***************************/

/* field justification */
#define NO_JUSTIFICATION	(0)
#define JUSTIFY_LEFT		(1)
#define JUSTIFY_CENTER		(2)
#define JUSTIFY_RIGHT		(3)

/* field options */
#define O_VISIBLE		(0x0001)
#define O_ACTIVE		(0x0002)
#define O_PUBLIC		(0x0004)
#define O_EDIT			(0x0008)
#define O_WRAP			(0x0010)
#define O_BLANK			(0x0020)
#define O_AUTOSKIP		(0x0040)
#define O_NULLOK		(0x0080)
#define O_PASSOK		(0x0100)
#define O_STATIC                (0x0200)

/* form options */
#define O_NL_OVERLOAD		(0x0001)
#define O_BS_OVERLOAD		(0x0002)

/* form driver commands */
#define REQ_NEXT_PAGE	 (KEY_MAX + 1)	/* move to next page		*/
#define REQ_PREV_PAGE	 (KEY_MAX + 2)	/* move to previous page	*/
#define REQ_FIRST_PAGE	 (KEY_MAX + 3)	/* move to first page		*/
#define REQ_LAST_PAGE	 (KEY_MAX + 4)	/* move to last page		*/

#define REQ_NEXT_FIELD	 (KEY_MAX + 5)	/* move to next field		*/
#define REQ_PREV_FIELD	 (KEY_MAX + 6)	/* move to previous field	*/
#define REQ_FIRST_FIELD	 (KEY_MAX + 7)	/* move to first field		*/
#define REQ_LAST_FIELD	 (KEY_MAX + 8)	/* move to last field		*/
#define REQ_SNEXT_FIELD	 (KEY_MAX + 9)	/* move to sorted next field	*/
#define REQ_SPREV_FIELD	 (KEY_MAX + 10)	/* move to sorted prev field	*/
#define REQ_SFIRST_FIELD (KEY_MAX + 11)	/* move to sorted first field	*/
#define REQ_SLAST_FIELD	 (KEY_MAX + 12)	/* move to sorted last field	*/
#define REQ_LEFT_FIELD	 (KEY_MAX + 13)	/* move to left to field	*/
#define REQ_RIGHT_FIELD	 (KEY_MAX + 14)	/* move to right to field	*/
#define REQ_UP_FIELD	 (KEY_MAX + 15)	/* move to up to field		*/
#define REQ_DOWN_FIELD	 (KEY_MAX + 16)	/* move to down to field	*/

#define REQ_NEXT_CHAR	 (KEY_MAX + 17)	/* move to next char in field	*/
#define REQ_PREV_CHAR	 (KEY_MAX + 18)	/* move to prev char in field	*/
#define REQ_NEXT_LINE	 (KEY_MAX + 19)	/* move to next line in field	*/
#define REQ_PREV_LINE	 (KEY_MAX + 20)	/* move to prev line in field	*/
#define REQ_NEXT_WORD	 (KEY_MAX + 21)	/* move to next word in field	*/
#define REQ_PREV_WORD	 (KEY_MAX + 22)	/* move to prev word in field	*/
#define REQ_BEG_FIELD	 (KEY_MAX + 23)	/* move to first char in field	*/
#define REQ_END_FIELD	 (KEY_MAX + 24)	/* move after last char in fld	*/
#define REQ_BEG_LINE	 (KEY_MAX + 25)	/* move to beginning of line	*/
#define REQ_END_LINE	 (KEY_MAX + 26)	/* move after last char in line	*/
#define REQ_LEFT_CHAR	 (KEY_MAX + 27)	/* move left in field		*/
#define REQ_RIGHT_CHAR	 (KEY_MAX + 28)	/* move right in field		*/
#define REQ_UP_CHAR	 (KEY_MAX + 29)	/* move up in field		*/
#define REQ_DOWN_CHAR	 (KEY_MAX + 30)	/* move down in field		*/

#define REQ_NEW_LINE	 (KEY_MAX + 31)	/* insert/overlay new line	*/
#define REQ_INS_CHAR	 (KEY_MAX + 32)	/* insert blank char at cursor	*/
#define REQ_INS_LINE	 (KEY_MAX + 33)	/* insert blank line at cursor	*/
#define REQ_DEL_CHAR	 (KEY_MAX + 34)	/* delete char at cursor	*/
#define REQ_DEL_PREV	 (KEY_MAX + 35)	/* delete char before cursor	*/
#define REQ_DEL_LINE	 (KEY_MAX + 36)	/* delete line at cursor	*/
#define REQ_DEL_WORD	 (KEY_MAX + 37)	/* delete line at cursor	*/
#define REQ_CLR_EOL	 (KEY_MAX + 38)	/* clear to end of line		*/
#define REQ_CLR_EOF	 (KEY_MAX + 39)	/* clear to end of field	*/
#define REQ_CLR_FIELD	 (KEY_MAX + 40)	/* clear entire field		*/
#define REQ_OVL_MODE	 (KEY_MAX + 41)	/* begin overlay mode		*/
#define REQ_INS_MODE	 (KEY_MAX + 42)	/* begin insert mode		*/
#define REQ_SCR_FLINE	 (KEY_MAX + 43)	/* scroll field forward a line	*/
#define REQ_SCR_BLINE	 (KEY_MAX + 44)	/* scroll field backward a line	*/
#define REQ_SCR_FPAGE	 (KEY_MAX + 45)	/* scroll field forward a page	*/
#define REQ_SCR_BPAGE	 (KEY_MAX + 46)	/* scroll field backward a page	*/
#define REQ_SCR_FHPAGE   (KEY_MAX + 47) /* scroll field forward  half page */
#define REQ_SCR_BHPAGE   (KEY_MAX + 48) /* scroll field backward half page */
#define REQ_SCR_FCHAR    (KEY_MAX + 49) /* horizontal scroll char          */
#define REQ_SCR_BCHAR    (KEY_MAX + 50) /* horizontal scroll char          */
#define REQ_SCR_HFLINE   (KEY_MAX + 51) /* horizontal scroll line          */
#define REQ_SCR_HBLINE   (KEY_MAX + 52) /* horizontal scroll line          */
#define REQ_SCR_HFHALF   (KEY_MAX + 53) /* horizontal scroll half line     */
#define REQ_SCR_HBHALF   (KEY_MAX + 54) /* horizontal scroll half line     */

#define REQ_VALIDATION	 (KEY_MAX + 55)	/* validate field		*/
#define REQ_NEXT_CHOICE	 (KEY_MAX + 56)	/* display next field choice	*/
#define REQ_PREV_CHOICE	 (KEY_MAX + 57)	/* display prev field choice	*/

#define MIN_FORM_COMMAND (KEY_MAX + 1)	/* used by form_driver		*/
#define MAX_FORM_COMMAND (KEY_MAX + 57)	/* used by form_driver		*/

#if defined(MAX_COMMAND)
#  if (MAX_FORM_COMMAND > MAX_COMMAND)
#    error Something is wrong -- MAX_FORM_COMMAND is greater than MAX_COMMAND
#  elif (MAX_COMMAND != (KEY_MAX + 128))
#    error Something is wrong -- MAX_COMMAND is already inconsistently defined.
#  endif
#else
#  define MAX_COMMAND (KEY_MAX + 128)
#endif

	/*************************
	*  standard field types  *
	*************************/
extern FIELDTYPE *TYPE_ALPHA,
                 *TYPE_ALNUM,
                 *TYPE_ENUM,
                 *TYPE_INTEGER,
                 *TYPE_NUMERIC,
                 *TYPE_REGEXP;

        /************************************
	*  built-in additional field types  *
        *  They are not defined in SVr4     *
	************************************/
extern FIELDTYPE *TYPE_IPV4;      /* Internet IP Version 4 address */

        /*********************** 
        *   Default objects    *
        ***********************/ 
extern FORM  *_nc_Default_Form;
extern FIELD *_nc_Default_Field;


	/***********************
	*  FIELDTYPE routines  *
	***********************/
extern FIELDTYPE 
                *new_fieldtype(
		    bool (* const field_check)(FIELD *,const void *),
		    bool (* const char_check)(int,const void *)),
                *link_fieldtype(FIELDTYPE *,FIELDTYPE *);

extern int      free_fieldtype(FIELDTYPE *),
                set_fieldtype_arg(FIELDTYPE *,
		    void * (* const make_arg)(va_list *),
		    void * (* const copy_arg)(const void *),
		    void (* const free_arg)(void *)),
                set_fieldtype_choice (FIELDTYPE *,
		    bool (* const next_choice)(FIELD *,const void *),
	      	    bool (* const prev_choice)(FIELD *,const void *));

	/*******************
	*  FIELD routines  *
	*******************/
extern FIELD    *new_field(int,int,int,int,int,int),
                *dup_field(FIELD *,int,int),
                *link_field(FIELD *,int,int);

extern int      free_field(FIELD *),
                field_info(const FIELD *,int *,int *,int *,int *,int *,int *),
                dynamic_field_info(const FIELD *,int *,int *,int *),
                set_max_field( FIELD *,int),
                move_field(FIELD *,int,int),
                set_field_type(FIELD *,FIELDTYPE *,...),
                set_new_page(FIELD *,bool),
                set_field_just(FIELD *,int),
                field_just(const FIELD *),
                set_field_fore(FIELD *,chtype),
                set_field_back(FIELD *,chtype),
                set_field_pad(FIELD *,int),
                field_pad(const FIELD *),
                set_field_buffer(FIELD *,int,const char *),
                set_field_status(FIELD *,bool),
                set_field_userptr(FIELD *, void *),
                set_field_opts(FIELD *,Field_Options),
                field_opts_on(FIELD *,Field_Options),
                field_opts_off(FIELD *,Field_Options);

extern chtype   field_fore(const FIELD *),
                field_back(const FIELD *);

extern bool     new_page(const FIELD *),
                field_status(const FIELD *);

extern void     *field_arg(const FIELD *);

extern void     *field_userptr(const FIELD *);

extern FIELDTYPE
                *field_type(const FIELD *);

extern char*    field_buffer(const FIELD *,int);

extern Field_Options  
                field_opts(const FIELD *);

	/******************
	*  FORM routines  *
	******************/
extern FORM     *new_form(FIELD **);

extern FIELD    **form_fields(const FORM *),
                *current_field(const FORM *);

extern WINDOW   *form_win(const FORM *),
                *form_sub(const FORM *);

extern Form_Hook
                form_init(const FORM *),
                form_term(const FORM *),
                field_init(const FORM *),
                field_term(const FORM *);

extern int      free_form(FORM *),
                set_form_fields(FORM *,FIELD **),
                field_count(const FORM *),
                set_form_win(FORM *,WINDOW *),
                set_form_sub(FORM *,WINDOW *),
                set_current_field(FORM *,FIELD *),
                field_index(const FIELD *),
                set_form_page(FORM *,int),
                form_page(const FORM *),
                scale_form(const FORM *,int *,int *),
                set_form_init(FORM *,Form_Hook),
                set_form_term(FORM *,Form_Hook),
                set_field_init(FORM *,Form_Hook),
                set_field_term(FORM *,Form_Hook),
                post_form(FORM *),
                unpost_form(FORM *),
                pos_form_cursor(FORM *),
                form_driver(FORM *,int),
                set_form_userptr(FORM *,void *),
                set_form_opts(FORM *,Form_Options),
                form_opts_on(FORM *,Form_Options),
                form_opts_off(FORM *,Form_Options),
                form_request_by_name(const char *);

extern const char
                *form_request_name(int);

extern void     *form_userptr(const FORM *);

extern Form_Options
                form_opts(const FORM *);

extern bool     data_ahead(const FORM *),
                data_behind(const FORM *);

#ifdef __cplusplus
  }
#endif

#endif	/* FORM_H */
