/*	$NetBSD: msg_sys.def,v 1.25 2003/07/28 09:55:24 dsl Exp $	*/

/*
 * Copyright 1997 Piermont Information Systems Inc.
 * All rights reserved.
 *
 * Written by Philip A. Nelson for Piermont Information Systems Inc.
 *
 * 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. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software develooped for the NetBSD Project by
 *      Piermont Information Systems Inc.
 * 4. The name of Piermont Information Systems Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY PIERMONT INFORMATION SYSTEMS INC. ``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 PIERMONT INFORMATION SYSTEMS INC. 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.
 *
 */

static WINDOW *msg_win = NULL;
static char *cbuffer;
static size_t cbuffersize;

static int last_i_was_nl, last_i_was_space;
static int last_o_was_punct, last_o_was_space;

static void	_msg_beep(void);
static int	_msg_vprintf(int, const char *, va_list);
static void	_msg_vprompt(const char *, int, const char *, char *,
			size_t, va_list);

static char *msgmap = MAP_FAILED;
static size_t msgmapsz;
static int msgmapcount;

/* Routines */

static void
_msg_beep(void)
{

	fprintf(stderr, "\a");
}

WINDOW *
msg_window(WINDOW *window)
{
	size_t ncbuffersize;
	char *ncbuffer;
	WINDOW *old;

	old = msg_win;
	if (!window)
		return old;
	msg_win = window;

	ncbuffersize = getmaxx(window) * getmaxy(window) + 1;
	while (ncbuffersize > cbuffersize) {
		ncbuffer = malloc(ncbuffersize);
		if (ncbuffer == NULL) {
			/* we might get truncated messages... */
			ncbuffersize <<= 1;
			continue;
		}
		if (cbuffer != NULL)
			free(cbuffer);
		cbuffer = ncbuffer;
		cbuffersize = ncbuffersize;
		break;
	}
	last_o_was_punct = 0;
	last_o_was_space = 1;
	return old;
}

int
msg_file(const char *file)
{
	int fd;

	if (msgmap != MAP_FAILED)
		munmap(msgmap, msgmapsz);
	msgmap = MAP_FAILED;
	if (!file)
		return 0;
	fd = open(file, O_RDONLY, 0);
	if (fd == -1)
		return -1;
	msgmapsz = lseek(fd, 0, SEEK_END);
	msgmap = mmap(0, msgmapsz, PROT_READ, MAP_SHARED, fd, 0);
	close(fd);
	if (msgmap == MAP_FAILED)
		return -1;
	/* check_magic */
	if (strcmp(msgmap, "MSGTXTS") != 0) {
		msg_file(NULL);
		return -1;
	}
	msgmapcount = atoi(msgmap + 8);
	return 0;
}

const char *
msg_string(msg msg_no)
{
	int m = (intptr_t)msg_no;

	if (m > sizeof msg_list / sizeof msg_list[0])
		/* guess that we were passed a text string */
		return msg_no;

	if (msgmap != MAP_FAILED && m != 0 && m <= msgmapcount) {
		unsigned int offset = atoi(msgmap + 8 + 8 * m);
		if (offset != 0 && offset < msgmapsz)
			return msgmap + offset;
	}

	return msg_list[m];
}

void
msg_clear(void)
{

	wclear(msg_win);
	last_o_was_punct = 0;
	last_o_was_space = 1;
}

void
msg_standout(void)
{

	wstandout(msg_win);
}

void
msg_standend(void)
{

	wstandend(msg_win);
}

static int
_msg_vprintf(int auto_fill, const char *fmt, va_list ap)
{
	const char *wstart, *afterw;
	int wordlen, nspaces;
	int ret;

	ret = vsnprintf(cbuffer, cbuffersize, fmt, ap);

	if (!auto_fill) {
		waddstr(msg_win, cbuffer);

		/*
		 * nothing is perfect if they flow text after a table,
		 * but this may be decent.
		 */
		last_i_was_nl = last_i_was_space = 1;
		last_o_was_punct = 0;
		last_o_was_space = 1;
		goto out;
	}

	for (wstart = afterw = cbuffer; *wstart; wstart = afterw) {

		/* eat one space, or a whole word of non-spaces */
		if (isspace(*afterw))
			afterw++;
		else
			while (*afterw && !isspace(*afterw))
				afterw++;

		/* this is an nl: special formatting necessary */
		if (*wstart == '\n') {
			if (last_i_was_nl || last_i_was_space) {

				if (getcurx(msg_win) != 0)
					waddch(msg_win, '\n');
				if (last_i_was_nl) {
					/* last was an nl: paragraph break */
					waddch(msg_win, '\n');
				} else {
					/* last was space: line break */
				}
				last_o_was_punct = 0;
				last_o_was_space = 1;
			} else {
				/* last_o_was_punct unchanged */
				/* last_o_was_space unchanged */
			}
			last_i_was_space = 1;
			last_i_was_nl = 1;
			continue;
		}

		/* this is a tab: special formatting necessary. */
		if (*wstart == '\t') {
			if (last_i_was_nl) {
				/* last was an nl: list indent */
				if (getcurx(msg_win) != 0)
					waddch(msg_win, '\n');
			} else {
				/* last was not an nl: columns */
			}
			waddch(msg_win, '\t');
			last_i_was_nl = 0;
			last_i_was_space = 1;
			last_o_was_punct = 0;
			last_o_was_space = 1;
			continue;
		}

		/* this is a space: ignore it but set flags */
		last_i_was_nl = 0;	/* all newlines handled above */
		last_i_was_space = isspace(*wstart);
		if (last_i_was_space)
			continue;

		/*
		 * we have a real "word," i.e. a sequence of non-space
		 * characters.  wstart is now the start of the word,
		 * afterw is the next character after the end.
		 */
		wordlen = afterw - wstart;
		nspaces = last_o_was_space ? 0 : (last_o_was_punct ? 2 : 1);
		if ((getcurx(msg_win) + nspaces + wordlen) >=
		      getmaxx(msg_win) &&
		    wordlen < (getmaxx(msg_win) / 3)) {
			/* wrap the line */
			waddch(msg_win, '\n');
			nspaces = 0;
		}

		/* output the word, preceded by spaces if necessary */
		while (nspaces-- > 0)
			waddch(msg_win, ' ');
		waddbytes(msg_win, wstart, wordlen);

		/* set up the 'last' state for the next time around */
		switch (afterw[-1]) {
		case '.':
		case '?':
		case '!':
			last_o_was_punct = 1;
			break;
		default:
			last_o_was_punct = 0;
			break;
		}
		last_o_was_space = 0;

		/* ... and do it all again! */
	}

	/* String ended with a newline.  They really want a line break. */
	if (last_i_was_nl) {
		if (getcurx(msg_win) != 0)
			waddch(msg_win, '\n');
		last_o_was_punct = 0;
		last_o_was_space = 1;
	}

out:
	wrefresh(msg_win);
	return ret;
}

void
msg_display(msg msg_no, ...)
{
	va_list ap;

	msg_clear();

	va_start(ap, msg_no);
	(void)_msg_vprintf(1, msg_string(msg_no), ap);
	va_end(ap);
}

void
msg_display_add(msg msg_no, ...)
{
	va_list ap;

	va_start(ap, msg_no);
	(void)_msg_vprintf(1, msg_string(msg_no), ap);
	va_end(ap);
}

static void
_erase_ch(void)
{
	int y, x;

	getyx(msg_win, y, x);
	x--;
	wmove(msg_win, y, x);
	waddch(msg_win, ' ');
	wmove(msg_win, y, x);
}

static void
_msg_vprompt(const char *fmt, int do_echo, const char *def, char *val,
    size_t max_chars, va_list ap)
{
	int ch;
	int count = 0;
	char *ibuf = alloca(max_chars);

	_msg_vprintf(0, fmt, ap);
	if (def != NULL && *def) {
		waddstr(msg_win, " [");
		waddstr(msg_win, def);
		waddstr(msg_win, "]");
	}
	waddstr(msg_win, ": ");
	wrefresh(msg_win);

	while ((ch = wgetch(msg_win)) != '\n') {
		if (ch == 0x08 || ch == 0x7f) {  /* bs or del */
			if (count > 0) {
				count--;
				if (do_echo)
					_erase_ch();
			} else
				_msg_beep();
		} else if (ch == 0x15) {	/* ^U; line kill */
			while (count > 0) {
				count--;
				if (do_echo)
					_erase_ch();
			}
		} else if (ch == 0x17) {        /* ^W; word kill */
			/*
			 * word kill kills the spaces and the 'word'
			 * (non-spaces) last typed.  the spaces before
			 * the 'word' aren't killed.
			 */
			while (count > 0 && isspace(ibuf[count - 1])) {
				count--;
				if (do_echo)
					_erase_ch();
			}
			while (count > 0 && !isspace(ibuf[count - 1])) {
				count--;
				if (do_echo)
					_erase_ch();
			}
		} else if (count < (max_chars - 1) && isprint(ch)) {
			if (do_echo)
				waddch(msg_win, ch);
			ibuf[count++] = ch;
		} else
			_msg_beep();
		if (do_echo)
			wrefresh(msg_win);
	}
	if (do_echo) {
		waddch(msg_win, '\n');
		last_o_was_punct = 0;
		last_o_was_space = 1;
	}

	/* copy the appropriate string to the output */
	if (count != 0) {
		ibuf[count] = '\0';
		strlcpy(val, ibuf, max_chars);
	} else if (def != NULL && val != def) {
		strlcpy(val, def, max_chars);
	}
}

void
msg_prompt(msg msg_no, const char *def, char *val, size_t max_chars, ...)
{
	va_list ap;

	msg_clear();

	va_start(ap, max_chars);
	_msg_vprompt(msg_string(msg_no), 1, def, val, max_chars, ap);
	va_end(ap);
}

void
msg_prompt_win(msg msg_no, int x, int y, int w, int h,
	const char *def, char *val, size_t max_chars, ...)
{
	va_list ap;
	WINDOW *win, *svwin;
	int maxx, maxy;

	maxx = getmaxx(msg_win);
	maxy = getmaxy(msg_win);
	if (w == 0) {
		va_start(ap, max_chars);
		w = vsnprintf(NULL, 0, msg_string(msg_no), ap);
		va_end(ap);
		if (def != NULL && *def != 0)
			w += 2 + strlen(def) + 1;
		w += 1 + 2 + max_chars + 1;
		if (w > maxx)
			w = maxx;
	}

	if (x == -1)
		x = (maxx - w) / 2;
	if (h < 3)
		h = 3;
	if (y < 3)
		y = (maxy - h) / 2;
	if (y + h > maxy)
		y = maxy - h;

	win = subwin(msg_win, h, w, y, x);
	if (win == NULL)
		wprintw(msg_win, "msg_prompt_win: "
			"newwin(%d, %d, %d, %d) failed\n",
			h, w, y, x);
	else {
		wbkgd(win, getbkgd(msg_win));
		wattrset(win, getattrs(msg_win));
		box(win, 0, 0);
		wrefresh(win);

		svwin = msg_window(subwin(msg_win, h - 2, w - 2, y + 1, x + 1));
		wbkgd(msg_win, getbkgd(win));
		wattrset(msg_win, getattrs(win));

		msg_clear();
	}

	va_start(ap, max_chars);
	_msg_vprompt(msg_string(msg_no), 1, def, val, max_chars, ap);
	va_end(ap);

	if (win != NULL) {
		wclear(win);
		wrefresh(win);
		delwin(msg_window(svwin));
		delwin(win);
	}
}

void
msg_prompt_add(msg msg_no, const char *def, char *val, size_t max_chars, ...)
{
	va_list ap;

	va_start(ap, max_chars);
	_msg_vprompt(msg_string(msg_no), 1, def, val, max_chars, ap);
	va_end(ap);
}

void
msg_prompt_noecho(msg msg_no, const char *def, char *val, size_t max_chars, ...)
{
	va_list ap;

	msg_clear();

	va_start(ap, max_chars);
	_msg_vprompt(msg_string(msg_no), 0, def, val, max_chars, ap);
	va_end(ap);
}

void
msg_table_add(msg msg_no, ...)
{
	va_list ap;

	va_start(ap, msg_no);
	(void)_msg_vprintf(0, msg_string(msg_no), ap);
	va_end(ap);
}