/*

 *  checklist.c -- implements the checklist box

 *

 *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)

 *     Stuart Herbert - S.Herbert@sheffield.ac.uk: radiolist extension

 *     Alessandro Rubini - rubini@ipvvis.unipv.it: merged the two

 *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)

 *

 *  This program 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

 *  of the License, or (at your option) any later version.

 *

 *  This program 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 this program; if not, write to the Free Software

 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */

#include "dialog.h"

static int list_width, check_x, item_x;

/*

 * Print list item

 */

static void print_item(WINDOW * win, int choice, int selected)

{

	int i;

	/* Clear 'residue' of last item */

	wattrset(win, dlg.menubox.atr);

	wmove(win, choice, 0);

	for (i = 0; i < list_width; i++)

		waddch(win, ' ');

	wmove(win, choice, check_x);

	wattrset(win, selected ? dlg.check_selected.atr

		 : dlg.check.atr);

	wprintw(win, "(%c)", item_is_tag('X') ? 'X' : ' ');

	wattrset(win, selected ? dlg.tag_selected.atr : dlg.tag.atr);

	mvwaddch(win, choice, item_x, item_str()[0]);

	wattrset(win, selected ? dlg.item_selected.atr : dlg.item.atr);

	waddstr(win, (char *)item_str() + 1);

	if (selected) {

		wmove(win, choice, check_x + 1);

		wrefresh(win);

	}

}

/*

 * Print the scroll indicators.

 */

static void print_arrows(WINDOW * win, int choice, int item_no, int scroll,

	     int y, int x, int height)

{

	wmove(win, y, x);

	if (scroll > 0) {

		wattrset(win, dlg.uarrow.atr);

		waddch(win, ACS_UARROW);

		waddstr(win, "(-)");

	} else {

		wattrset(win, dlg.menubox.atr);

		waddch(win, ACS_HLINE);

		waddch(win, ACS_HLINE);

		waddch(win, ACS_HLINE);

		waddch(win, ACS_HLINE);

	}

	y = y + height + 1;

	wmove(win, y, x);

	if ((height < item_no) && (scroll + choice < item_no - 1)) {

		wattrset(win, dlg.darrow.atr);

		waddch(win, ACS_DARROW);

		waddstr(win, "(+)");

	} else {

		wattrset(win, dlg.menubox_border.atr);

		waddch(win, ACS_HLINE);

		waddch(win, ACS_HLINE);

		waddch(win, ACS_HLINE);

		waddch(win, ACS_HLINE);

	}

}

/*

 *  Display the termination buttons

 */

static void print_buttons(WINDOW * dialog, int height, int width, int selected)

{

	int x = width / 2 - 11;

	int y = height - 2;

	print_button(dialog, gettext("Select"), y, x, selected == 0);

	print_button(dialog, gettext(" Help "), y, x + 14, selected == 1);

	wmove(dialog, y, x + 1 + 14 * selected);

	wrefresh(dialog);

}

/*

 * Display a dialog box with a list of options that can be turned on or off

 * in the style of radiolist (only one option turned on at a time).

 */

int dialog_checklist(const char *title, const char *prompt, int height,

		     int width, int list_height)

{

	int i, x, y, box_x, box_y;

	int key = 0, button = 0, choice = 0, scroll = 0, max_choice;

	WINDOW *dialog, *list;

	/* which item to highlight */

	item_foreach() {

		if (item_is_tag('X'))

			choice = item_n();

		if (item_is_selected()) {

			choice = item_n();

			break;

		}

	}

do_resize:

	if (getmaxy(stdscr) < (height + 6))

		return -ERRDISPLAYTOOSMALL;

	if (getmaxx(stdscr) < (width + 6))

		return -ERRDISPLAYTOOSMALL;

	max_choice = MIN(list_height, item_count());

	/* center dialog box on screen */

	x = (COLS - width) / 2;

	y = (LINES - height) / 2;

	draw_shadow(stdscr, y, x, height, width);

	dialog = newwin(height, width, y, x);

	keypad(dialog, TRUE);

	draw_box(dialog, 0, 0, height, width,

		 dlg.dialog.atr, dlg.border.atr);

	wattrset(dialog, dlg.border.atr);

	mvwaddch(dialog, height - 3, 0, ACS_LTEE);

	for (i = 0; i < width - 2; i++)

		waddch(dialog, ACS_HLINE);

	wattrset(dialog, dlg.dialog.atr);

	waddch(dialog, ACS_RTEE);

	print_title(dialog, title, width);

	wattrset(dialog, dlg.dialog.atr);

	print_autowrap(dialog, prompt, width - 2, 1, 3);

	list_width = width - 6;

	box_y = height - list_height - 5;

	box_x = (width - list_width) / 2 - 1;

	/* create new window for the list */

	list = subwin(dialog, list_height, list_width, y + box_y + 1,

	              x + box_x + 1);

	keypad(list, TRUE);

	/* draw a box around the list items */

	draw_box(dialog, box_y, box_x, list_height + 2, list_width + 2,

	         dlg.menubox_border.atr, dlg.menubox.atr);

	/* Find length of longest item in order to center checklist */

	check_x = 0;

	item_foreach()

		check_x = MAX(check_x, strlen(item_str()) + 4);

	check_x = (list_width - check_x) / 2;

	item_x = check_x + 4;

	if (choice >= list_height) {

		scroll = choice - list_height + 1;

		choice -= scroll;

	}

	/* Print the list */

	for (i = 0; i < max_choice; i++) {

		item_set(scroll + i);

		print_item(list, i, i == choice);

	}

	print_arrows(dialog, choice, item_count(), scroll,

		     box_y, box_x + check_x + 5, list_height);

	print_buttons(dialog, height, width, 0);

	wnoutrefresh(dialog);

	wnoutrefresh(list);

	doupdate();

	while (key != KEY_ESC) {

		key = wgetch(dialog);

		for (i = 0; i < max_choice; i++) {

			item_set(i + scroll);

			if (toupper(key) == toupper(item_str()[0]))

				break;

		}

		if (i < max_choice || key == KEY_UP || key == KEY_DOWN ||

		    key == '+' || key == '-') {

			if (key == KEY_UP || key == '-') {

				if (!choice) {

					if (!scroll)

						continue;

					/* Scroll list down */

					if (list_height > 1) {

						/* De-highlight current first item */

						item_set(scroll);

						print_item(list, 0, FALSE);

						scrollok(list, TRUE);

						wscrl(list, -1);

						scrollok(list, FALSE);

					}

					scroll--;

					item_set(scroll);

					print_item(list, 0, TRUE);

					print_arrows(dialog, choice, item_count(),

						     scroll, box_y, box_x + check_x + 5, list_height);

					wnoutrefresh(dialog);

					wrefresh(list);

					continue;	/* wait for another key press */

				} else

					i = choice - 1;

			} else if (key == KEY_DOWN || key == '+') {

				if (choice == max_choice - 1) {

					if (scroll + choice >= item_count() - 1)

						continue;

					/* Scroll list up */

					if (list_height > 1) {

						/* De-highlight current last item before scrolling up */

						item_set(scroll + max_choice - 1);

						print_item(list,

							    max_choice - 1,

							    FALSE);

						scrollok(list, TRUE);

						wscrl(list, 1);

						scrollok(list, FALSE);

					}

					scroll++;

					item_set(scroll + max_choice - 1);

					print_item(list, max_choice - 1, TRUE);

					print_arrows(dialog, choice, item_count(),

						     scroll, box_y, box_x + check_x + 5, list_height);

					wnoutrefresh(dialog);

					wrefresh(list);

					continue;	/* wait for another key press */

				} else

					i = choice + 1;

			}

			if (i != choice) {

				/* De-highlight current item */

				item_set(scroll + choice);

				print_item(list, choice, FALSE);

				/* Highlight new item */

				choice = i;

				item_set(scroll + choice);

				print_item(list, choice, TRUE);

				wnoutrefresh(dialog);

				wrefresh(list);

			}

			continue;	/* wait for another key press */

		}

		switch (key) {

		case 'H':

		case 'h':

		case '?':

			button = 1;

			/* fall-through */

		case 'S':

		case 's':

		case ' ':

		case '\n':

			item_foreach()

				item_set_selected(0);

			item_set(scroll + choice);

			item_set_selected(1);

			delwin(list);

			delwin(dialog);

			return button;

		case TAB:

		case KEY_LEFT:

		case KEY_RIGHT:

			button = ((key == KEY_LEFT ? --button : ++button) < 0)

			    ? 1 : (button > 1 ? 0 : button);

			print_buttons(dialog, height, width, button);

			wrefresh(dialog);

			break;

		case 'X':

		case 'x':

			key = KEY_ESC;

			break;

		case KEY_ESC:

			key = on_key_esc(dialog);

			break;

		case KEY_RESIZE:

			delwin(list);

			delwin(dialog);

			on_key_resize();

			goto do_resize;

		}

		/* Now, update everything... */

		doupdate();

	}

	delwin(list);

	delwin(dialog);

	return key;		/* ESC pressed */

}