/*	$NetBSD: form.h,v 1.7 2001/01/30 06:44:42 blymn Exp $	*/

/*-
 * Copyright (c) 1998-1999 Brett Lymn
 *               (blymn@baea.com.au, brett_lymn@yahoo.com.au)
 * All rights reserved.
 *
 * This code has been donated to The NetBSD Foundation by the Author.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software withough specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *
 */

#ifndef FORM_H
#define FORM_H 1
#include <sys/queue.h>
#include <stdarg.h>
#include <curses.h>
#include <eti.h>

/* Define the types of field justification that can be used. */
#define NO_JUSTIFICATION  0
#define JUSTIFY_RIGHT     1
#define JUSTIFY_LEFT      2
#define JUSTIFY_CENTER    3

/* Define the max and min valid justification styles for range checking */
#define MIN_JUST_STYLE    NO_JUSTIFICATION
#define MAX_JUST_STYLE    JUSTIFY_CENTER

/* Options for the fields */
typedef unsigned int Form_Options;

/* form options */
#define O_BS_OVERLOAD (0x001)
#define O_NL_OVERLOAD (0x002)

/* field options */
#define O_VISIBLE  0x001  /* Field is visible */
#define O_ACTIVE   0x002  /* Field is active in the form */
#define O_PUBLIC   0x004  /* The contents entered into the field is echoed */
#define O_EDIT     0x008  /* Can edit the field */
#define O_WRAP     0x010  /* The field contents can line wrap */
#define O_BLANK    0x020  /* Blank the field on modification */
#define O_AUTOSKIP 0x040  /* Skip to next field when current is full */
#define O_NULLOK   0x080  /* Field is allowed to contain no data */
#define O_STATIC   0x100  /* Field is not dynamic */
#define O_PASSOK   0x200  /* ??? */

/*
 * Form driver requests - be VERY careful about changing the ordering
 * of the requests below.  The form driver code depends on a particular
 * order for the requests.
 */
#define REQ_MIN_REQUEST   0x100 /* must equal value of the first request */

#define REQ_NEXT_PAGE     0x100 /* next page in form */
#define REQ_PREV_PAGE     0x101 /* previous page in form */
#define REQ_FIRST_PAGE    0x102 /* goto first page in form */
#define REQ_LAST_PAGE     0x103 /* goto last page in form */

#define REQ_NEXT_FIELD    0x104 /* move to the next field */
#define REQ_PREV_FIELD    0x105 /* move to the previous field */
#define REQ_FIRST_FIELD   0x106 /* goto the first field */
#define REQ_LAST_FIELD    0x107 /* goto the last field */

#define REQ_SNEXT_FIELD   0x108 /* move to the next field in sorted order */
#define REQ_SPREV_FIELD   0x109 /* move to the prev field in sorted order */
#define REQ_SFIRST_FIELD  0x10a /* move to the first sorted field */
#define REQ_SLAST_FIELD   0x10b /* move to the last sorted field */

#define REQ_LEFT_FIELD    0x10c /* go left one field */
#define REQ_RIGHT_FIELD   0x10d /* go right one field */
#define REQ_UP_FIELD      0x10e /* go up one field */
#define REQ_DOWN_FIELD    0x10f /* go down one field */

#define REQ_NEXT_CHAR     0x110 /* move to the next char in field */
#define REQ_PREV_CHAR     0x111 /* move to the previous char in field */
#define REQ_NEXT_LINE     0x112 /* go to the next line in the field */
#define REQ_PREV_LINE     0x113 /* go to the previous line in the field */
#define REQ_NEXT_WORD     0x114 /* go to the next word in the field */
#define REQ_PREV_WORD     0x115 /* go to the previous word in the field */
#define REQ_BEG_FIELD     0x116 /* go to the beginning of the field */
#define REQ_END_FIELD     0x117 /* go to the end of the field */
#define REQ_BEG_LINE      0x118 /* go to the beginning of the line */
#define REQ_END_LINE      0x119 /* go to the end of the line */
#define REQ_LEFT_CHAR     0x11a /* move left in the field */
#define REQ_RIGHT_CHAR    0x11b /* move right in the field */
#define REQ_UP_CHAR       0x11c /* move up in the field */
#define REQ_DOWN_CHAR     0x11d /* move down in the field */

#define REQ_NEW_LINE      0x11e /* insert/overlay a new line */
#define REQ_INS_CHAR      0x11f /* insert a blank char at the cursor */
#define REQ_INS_LINE      0x120 /* insert a blank line at the cursor */

#define REQ_DEL_CHAR      0x121 /* delete the current character */
#define REQ_DEL_PREV      0x122 /* delete the character before the current */
#define REQ_DEL_LINE      0x123 /* delete the current line */
#define REQ_DEL_WORD      0x124 /* delete the word at the cursor */
#define REQ_CLR_EOL       0x125 /* clear to the end of the line */
#define REQ_CLR_EOF       0x126 /* clear to the end of the field */
#define REQ_CLR_FIELD     0x127 /* clear the field */

#define REQ_OVL_MODE      0x128 /* overlay mode */
#define REQ_INS_MODE      0x129 /* insert mode */

#define REQ_SCR_FLINE     0x12a /* scroll field forward one line */
#define REQ_SCR_BLINE     0x12b /* scroll field backward one line */
#define REQ_SCR_FPAGE     0x12c /* scroll field forward one page */
#define REQ_SCR_BPAGE     0x12d /* scroll field backward one page */
#define REQ_SCR_FHPAGE    0x12e /* scroll field forward half a page */
#define REQ_SCR_BHPAGE    0x12f /* scroll field backward half a page */

#define REQ_SCR_FCHAR     0x130 /* horizontal scroll forward a character */
#define REQ_SCR_BCHAR     0x131 /* horizontal scroll backward a character */
#define REQ_SCR_HFLINE    0x132 /* horizontal scroll forward a line */
#define REQ_SCR_HBLINE    0x133 /* horizontal scroll backward a line */
#define REQ_SCR_HFHALF    0x134 /* horizontal scroll forward half a line */
#define REQ_SCR_HBHALF    0x135 /* horizontal scroll backward half a line */

#define REQ_VALIDATION    0x136 /* validate the field */
#define REQ_PREV_CHOICE   0x137 /* display previous field choice */
#define REQ_NEXT_CHOICE   0x138 /* display next field choice */

#define REQ_MAX_COMMAND   0x138 /* must match the last driver command */

typedef struct _form_string {
	size_t allocated;
	unsigned int length;
	char *string;
} FORM_STR;

typedef struct _form_field FIELD;
typedef struct _form_struct FORM;
typedef struct _form_fieldtype FIELDTYPE;

typedef struct _formi_page_struct _FORMI_PAGE_START;
typedef struct formi_type_link_struct _FORMI_TYPE_LINK;

typedef void (*Form_Hook)(FORM *);

/* definition of a field in the form */
struct _form_field {
	unsigned int rows; /* rows in the field */
	unsigned int cols; /* columns in the field */
	unsigned int drows; /* dynamic rows */
	unsigned int dcols; /* dynamic columns */
	unsigned int max; /* maximum growth */
	unsigned int form_row; /* starting row in the form subwindow */
	unsigned int form_col; /* starting column in the form subwindow */
	unsigned int nrows; /* number of off screen rows */
	int index; /* index of this field in form fields array. */
	int nbuf; /* number of buffers associated with this field */
	int buf0_status; /* set to true if buffer 0 has changed. */
	int justification; /* justification style of the field */
	int overlay; /* set to true if field is in overlay mode */
	unsigned int start_char; /* starting char in string (horiz scroll) */
	unsigned int start_line; /* starting line in field (vert scroll) */
	unsigned int hscroll; /* amount of horizontal scroll... */
	unsigned int row_count; /* number of rows actually used in field */
	unsigned int cursor_xpos; /* x pos of cursor in field */
	unsigned int cursor_ypos; /* y pos of cursor in field */
	short page_break; /* start of a new page on the form if 1 */
	short page; /* number of the page this field is on */
	chtype fore; /* character attributes for the foreground */
	chtype back; /* character attributes for the background */
	int pad; /* padding character */
	Form_Options opts; /* options for the field */
	FORM *parent; /* the form this field is bound to, if any */
	FIELD *up; /* field above this one */
	FIELD *down; /* field below this one */
	FIELD *left; /* field to the left of this one */
	FIELD *right; /* field to the right of this one */
	void *userptr;  /* user defined pointer. */
	FIELD *link; /* used if fields are linked */
	FIELDTYPE *type; /* type struct for the field */
	CIRCLEQ_ENTRY(_form_field) glue; /* circle queue glue for sorting fields */
	char *args; /* args for field type. */
	FORM_STR *buffers; /* array of buffers for the field */
};

/* define the types of fields we can have */
extern FIELDTYPE *TYPE_ALNUM;
extern FIELDTYPE *TYPE_ALPHA;
extern FIELDTYPE *TYPE_ENUM;
extern FIELDTYPE *TYPE_INTEGER;
extern FIELDTYPE *TYPE_NUMERIC;
extern FIELDTYPE *TYPE_REGEXP;
extern FIELDTYPE *TYPE_USER;

/* definition of a field type. */
struct _form_fieldtype {
	unsigned flags; /* status of the type */
	unsigned refcount; /* in use if > 0 */
	_FORMI_TYPE_LINK *link; /* set if this type is linked */

	char * (*make_args)(va_list *); /* make the args for the type */
	char * (*copy_args)(char *); /* copy the args for the type */
	void (*free_args)(char *); /* free storage used by the args */
	int (*field_check)(FIELD *, char *); /* field validation routine */
	int (*char_check)(int, char *); /* char validation routine */
	int (*next_choice)(FIELD *, char *); /* function to select next
						choice */
	int (*prev_choice)(FIELD *, char *); /* function to select prev
						choice */
};
	
/*definition of a form */

struct _form_struct {
	int in_init; /* true if performing a init or term function */
	int posted; /* the form is posted */
	int wrap; /* wrap from last field to first field if true */
	WINDOW *win; /* window for the form */
	WINDOW *subwin; /* subwindow for the form */
	void *userptr; /* user defined pointer */
	Form_Options opts; /* options for the form */
	Form_Hook form_init; /* function called when form posted and
				after page change */
	Form_Hook form_term; /* function called when form is unposted and
				before page change */
	Form_Hook field_init; /* function called when form posted and after
				 current field changes */
	Form_Hook field_term; /* function called when form unposted and
				 before current field changes */
	int field_count; /* number of fields attached */
	int cur_field; /* current field */
	int page; /* current page of form */
	int max_page; /* number of pages in the form */
	int subwin_created; /* libform made the window */
	_FORMI_PAGE_START *page_starts; /* dynamic array of fields that start
					   the pages */
	CIRCLEQ_HEAD(_formi_sort_head, _form_field) sorted_fields; /* sorted field
								list */
	FIELD **fields; /* array of fields attached to this form. */
};

/* Public function prototypes. */
__BEGIN_DECLS

FIELD *current_field(FORM *);
int data_ahead(FORM *);
int data_behind(FORM *);
FIELD *dup_field(FIELD *, int, int);
int dynamic_field_info(FIELD *, int *, int *, int *);
char *field_arg(FIELD *);
chtype field_back(FIELD *);
char *field_buffer(FIELD *, int);
int field_count(FORM *);
chtype field_fore(FIELD *);
int field_index(FIELD *);
int field_info __P((FIELD *, int *, int *, int *, int *,
		    int *, int *));
Form_Hook field_init(FORM *);
int field_just(FIELD *);
Form_Options field_opts(FIELD *);
int field_opts_off(FIELD *, Form_Options);
int field_opts_on(FIELD *, Form_Options);
int field_pad(FIELD *);
int field_status(FIELD *);
Form_Hook field_term(FORM *);
FIELDTYPE *field_type(FIELD *);
void *field_userptr(FIELD *);
int form_driver(FORM *, int);
FIELD **form_fields(FORM *);
Form_Hook form_init(FORM *);
Form_Options form_opts(FORM *);
int form_opts_off(FORM *, Form_Options);
int form_opts_on(FORM *, Form_Options);
int form_page(FORM *);
WINDOW *form_sub(FORM *);
Form_Hook form_term(FORM *);
void *form_userptr(FORM *);
WINDOW *form_win(FORM *);
int free_field(FIELD *);
int free_fieldtype(FIELDTYPE *);
int free_form(FORM *);
FIELD *link_field(FIELD *, int, int);
FIELDTYPE *link_fieldtype(FIELDTYPE *, FIELDTYPE *);
int move_field(FIELD *, int, int);
FIELD *new_field(int, int, int, int, int, int);
FIELDTYPE *new_fieldtype(int (* field_check)(FIELD *, char *),
					     int (* char_check)(int, char *));
FORM *new_form(FIELD **);
int new_page(FIELD *);
int pos_form_cursor(FORM *);
int post_form(FORM *);
int scale_form(FORM *, int *, int *);
int set_current_field(FORM *, FIELD *);
int set_field_back(FIELD *, chtype);
int set_field_buffer(FIELD *, int, char *);
int set_field_fore(FIELD *, chtype);
int set_field_init(FORM *, Form_Hook);
int set_field_just(FIELD *, int);
int set_field_opts(FIELD *, Form_Options);
int set_field_pad(FIELD *, int);
int set_field_status(FIELD *, int);
int set_field_term(FORM *, Form_Hook);
int set_field_type(FIELD *, FIELDTYPE *, ...);
int set_field_userptr(FIELD *, void *);
int set_fieldtype_arg(FIELDTYPE *, char *(*)(va_list *),
			   char *(*)(char *),
			   void (*)(char *));
int set_fieldtype_choice(FIELDTYPE *, int (*)(FIELD *, char *),
			      int (*)(FIELD *, char *));
int set_form_fields(FORM *, FIELD **);
int set_form_init(FORM *, Form_Hook);
int set_form_opts(FORM *, Form_Options);
int set_form_page(FORM *, int);
int set_form_sub(FORM *, WINDOW *);
int set_form_term(FORM *, Form_Hook);
int set_form_userptr(FORM *, void *);
int set_form_win(FORM *, WINDOW *);
int set_max_field(FIELD *, int);
int set_new_page(FIELD *, int);
int unpost_form(FORM *);

__END_DECLS

#endif /* FORM_H */