/*****************************************************************************
 *
 * File ..................: mutil.c
 * Purpose ...............: Utilities
 * Last modification date : 25-May-2001
 *
 *****************************************************************************
 * Copyright (C) 1997-2001
 *   
 * Michiel Broek		FIDO:		2:280/2802
 * Beekmansbos 10
 * 1971 BV IJmuiden
 * the Netherlands
 *
 * This file is part of MBSE BBS.
 *
 * This BBS is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * MB BBS is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with MB BBS; see the file COPYING.  If not, write to the Free
 * Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *****************************************************************************/

#include "../lib/libs.h"
#include "common.h"
#include "mutil.h"


unsigned char readkey(int y, int x, int fg, int bg)
{
	int		rc = -1, i;
	unsigned char 	ch = 0;

	if ((ttyfd = open("/dev/tty", O_RDWR|O_NONBLOCK)) < 0) {
		perror("open 9");
		exit(1);
	}
	Setraw();

	i = 0;
	while (rc == -1) {
		if ((i % 10) == 0)
			show_date(fg, bg, 0, 0);

		locate(y, x);
		fflush(stdout);
		rc = Waitchar(&ch, 5);
		if ((rc == 1) && (ch != KEY_ESCAPE))
			break;

		if ((rc == 1) && (ch == KEY_ESCAPE))
			rc = Escapechar(&ch);

		if (rc == 1)
			break;
		i++;
		Nopper();
	}

	Unsetraw();
	close(ttyfd);

	return ch;
}



unsigned char testkey(int y, int x)
{
	int		rc;
	unsigned char	ch = 0;

	Nopper();
	locate(y, x);
	fflush(stdout);

	if ((ttyfd = open("/dev/tty", O_RDWR|O_NONBLOCK)) < 0) {
		perror("open 9");
		exit(1);
	}
	Setraw();

	rc = Waitchar(&ch, 100);
	if (rc == 1) {
		if (ch == KEY_ESCAPE)
			rc = Escapechar(&ch);
	}

	Unsetraw();
	close(ttyfd);

	if (rc == 1)
		return ch;
	else
		return '\0';
}



void show_field(int y, int x, char *str, int length, int fill)
{
	mvprintw(y, x, padleft(str, length, fill));
}


int insertflag = 0;

void newinsert(int i, int fg, int bg)
{
	insertflag = i;
	set_color(YELLOW, RED);
	if (insertflag != 0) {
		mvprintw(2,36," INS ");
	} else {
		mvprintw(2,36," OVR ");
	}
	set_color(fg, bg);
}




char *edit_field(int y, int x, int w, int p, char *s_)
{
	int		i, charok, first, curpos;
	static char	s[256];
	unsigned int	ch;

	memset((char *)s, 0, 256);
	sprintf(s, "%s", s_);
	curpos = 0;
	first = 1;
	newinsert(1, YELLOW, BLUE);

	do {
		set_color(YELLOW, BLUE);
		show_field(y, x, s, w, '_');
		locate(y, x + curpos);
		do {
			ch = readkey(y, x + curpos, YELLOW, BLUE);
			set_color(YELLOW, BLUE);

			/*
			 *  Test if the pressed key is a valid key.
			 */
			charok = 0;
			if ((ch >= ' ') && (ch <= '~')) {
				switch(p) {
				case '!':	
					ch = toupper(ch);
					charok = 1;
					break;
				case 'X':
					charok = 1;
					break;
				case '9':
					if (ch == ' ' || ch == '-' || ch == ',' ||
					    ch == '.' || isdigit(ch)) 
						charok = 1;
					break;
				case 'U':
					ch = toupper(ch);
					if (isupper(ch))
						charok = 1;
					break;
				default:
					putchar(7);
					break;
				}
			}

		} while (charok == 0 && ch != KEY_ENTER && ch != KEY_LINEFEED &&
			   ch != KEY_DEL && ch != KEY_INS && ch != KEY_HOME &&
			   ch != KEY_LEFT && ch != KEY_RIGHT && ch != KEY_ESCAPE &&
			   ch != KEY_BACKSPACE && ch != KEY_RUBOUT && ch != KEY_END);


		if (charok == 1) {
			if (first == 1) {
				first = 0;
				memset((char *)s, 0, 256);
				curpos = 0;
			}
			if (curpos < w) {
				if (insertflag == 1) {
					/*
					 *  Insert mode 
					 */
					if (strlen(s) < w) {
						if (curpos < strlen(s)) {
							for (i = strlen(s); i >= curpos; i--)
								s[i+1] = s[i];
						} 
						s[curpos] = ch;
						if (curpos < w)
							curpos++;
					} else {
						putchar(7);
					}
				} else {
					/*
					 *  Overwrite mode
					 */
					s[curpos] = ch;
					if (curpos < w)
						curpos++;
				}
			} else {
				/*
				 *  The field is full 
				 */
				putchar(7);
			}
		} /* if charok */

		first = 0;
		switch (ch) {
		case KEY_HOME:
				curpos = 0;	
				break;
		case KEY_END:
				curpos = strlen(s);
				break;
		case KEY_LEFT:
				if (curpos > 0)
					curpos--;
				else
					putchar(7);
				break;
		case KEY_RIGHT:
				if (curpos < strlen(s))
					curpos++;
				else
					putchar(7);
				break;
		case KEY_INS:
				if (insertflag == 1)
					newinsert(0, YELLOW, BLUE);
				else
					newinsert(1, YELLOW, BLUE);
				break;
		case KEY_BACKSPACE:
				if (strlen(s) > 0) {
					if (curpos >= strlen(s)) {
						curpos--;
						s[curpos] = '\0';
					} else {
						for (i = curpos; i < strlen(s); i++)
							s[i] = s[i+1];
						s[i] = '\0';
					}
				} else
					putchar(7);
				break;
		case KEY_RUBOUT:
		case KEY_DEL:
				if (strlen(s) > 0) {
					if ((curpos) == (strlen(s) -1)) {
						s[curpos] = '\0';
					} else {
						for (i = curpos; i < strlen(s); i++)
							s[i] = s[i+1];
						s[i] = '\0';
					}
				} else
					putchar(7);
				break;
		}
	} while ((ch != KEY_ENTER) && (ch != KEY_LINEFEED) && (ch != KEY_ESCAPE));

	set_color(LIGHTGRAY, BLUE);
	mvprintw(2,36, "     ");
	set_color(LIGHTGRAY, BLACK);
	return s;
}



/*
 * Select menu, max is the highest item to pick. Returns zero if
 * "-" (previous level) is selected.
 */
int select_menu(int max)
{
	static char	*menu=(char *)"-";
	char		help[80];
	int		pick;

	sprintf(help, "Select menu item (1..%d) or ^\"-\"^ for previous level.", max);
	showhelp(help);

	/* 
	 * Loop forever until it's right.
	 */
	for (;;) {
		mvprintw(LINES - 3, 6, "Enter your choice >");
		menu = (char *)"-";
		menu = edit_field(LINES - 3, 26, 3, '9', menu);
		locate(LINES -3, 6);
		clrtoeol();

		if (strncmp(menu, "-", 1) == 0) 
			return 0;

		pick = atoi(menu);
		if ((pick >= 1) && (pick <= max)) 
			return pick;

		working(2, 0, 0);
		working(0, 0, 0);
	}
}



void clrtoeol()
{
	int	i;

	printf("\r");
	for (i = 0; i < COLS; i++)
		putchar(' ');
	printf("\r");
	fflush(stdout);
}



void hor_lin(int y, int x, int len)
{
	int	i;

	locate(y, x);
	for (i = 0; i < len; i++)
		putchar('-');
	fflush(stdout);
}



static int	old_f = -1;
static int	old_b = -1;

void set_color(int f, int b)
{
	if ((f != old_f) || (b != old_b)) {
		old_f = f;
		old_b = b;
		colour(f, b);
		fflush(stdout);
	}
}



static time_t lasttime;

/*
 * Show the current date & time in the second status row
 */
void show_date(int fg, int bg, int y, int x)
{
	time_t	now;
	char	*p;

	time(&now);
	if (now != lasttime) {
		lasttime = now;
		set_color(LIGHTGREEN, BLUE);
		p = ctime(&now);
		Striplf(p);
		mvprintw(1, 44, (char *)"%s TZUTC %s", p, gmtoffset(now)); 
		p = asctime(gmtime(&now));
		Striplf(p);
		mvprintw(2, 44, (char *)"%s UTC", p);
		if (y && x)
			locate(y, x);
		set_color(fg, bg);
	}
}



void center_addstr(int y, char *s)
{
	mvprintw(y, (COLS / 2) - (strlen(s) / 2), s);
}



/*
 * Curses and screen initialisation.
 */
void screen_start(char *name)
{
	int	i;

	/*
	 *  Overwrite screen the first time, if user had it black on white
	 *  it will change to white on black. clear() won't do the trick.
	 */
	set_color(LIGHTGRAY, BLUE);
	locate(1, 1);
	for (i = 0; i < LINES; i++) {
		if (i == 3)
			colour(LIGHTGRAY, BLACK);
		clrtoeol();
		if (i < LINES)
			printf("\n");
	}
	fflush(stdout);

	set_color(WHITE, BLUE);
	locate(1, 1);
	printf((char *)"%s for MBSE BBS version %s", name, VERSION);  
	set_color(YELLOW, BLUE);
	locate(2, 1);
	printf((char *)"(c) Copyright Michiel Broek");
	set_color(LIGHTGRAY, BLACK);
	show_date(LIGHTGRAY, BLACK, 0, 0);
	fflush(stdout);
}



/*
 * Screen deinit
 */
void screen_stop()
{
	set_color(LIGHTGRAY, BLACK);
	clear();
	fflush(stdout);
}



/*
 * Message at the upperright window about actions 
 */
void working(int txno, int y, int x)
{
	int	i;

	/*
	 * If txno not 0 there will be something written. The 
	 * reversed attributes for mono, or white on red for
	 * color screens is set. The cursor is turned off and 
	 * original cursor position is saved.
	 */
	show_date(LIGHTGRAY, BLACK, 0, 0);

	if (txno != 0)
		set_color(YELLOW, RED);
	else
		set_color(LIGHTGRAY, BLACK);

	switch (txno) {
	case 0: mvprintw(4, 66, (char *)"             ");
		break;
	case 1: mvprintw(4, 66, (char *)"Working . . .");
		break;
	case 2:	mvprintw(4, 66, (char *)">>> ERROR <<<");
		for (i = 1; i <= 5; i++) {
			putchar(7);
			fflush(stdout);
			usleep(150000);
		}
		usleep(550000);
		break;
	case 3: mvprintw(4, 66, (char *)"Form inserted");
		putchar(7);
		fflush(stdout);
		sleep(1);
		break;
	case 4: mvprintw(4, 66, (char *)"Form deleted ");
		putchar(7);
		fflush(stdout);
		sleep(1);
		break;
	}

	show_date(LIGHTGRAY, BLACK, 0, 0);
	set_color(LIGHTGRAY, BLACK);
	if (y && x)
		locate(y, x);
	fflush(stdout);
}



/*
 *  Clear the middle window 
 */
void clr_index()
{
	int i;

	set_color(LIGHTGRAY, BLACK);
	for (i = 3; i <= (LINES - 1); i++) {
		locate(i, 1);
		clrtoeol();
	}
}



/*
 * Show help at the bottom of the screen.
 */
void showhelp(char *T)
{
	int f, i, x, forlim;

	f = FALSE;
	locate(LINES-1, 1);
	set_color(WHITE, RED);
	clrtoeol();
	x = 0;
	forlim = strlen(T);

	for (i = 0; i < forlim; i++) {
		if (T[i] == '^') {
			if (f == FALSE) {
				f = TRUE;
				set_color(YELLOW, RED);
			} else {
				f = FALSE;
				set_color(WHITE, RED);
			}
		} else {
			putchar(T[i]);
			x++;
		}
	}
	set_color(LIGHTGRAY, BLACK);
	fflush(stdout);
}