/*
 *  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, checkflag;

/*
 * Print list item
 */
static void
print_item (WINDOW * win, const char *item, int status,
	    int choice, int selected)
{
    int i;

    /* Clear 'residue' of last item */
    wattrset (win, menubox_attr);
    wmove (win, choice, 0);
    for (i = 0; i < list_width; i++)
	waddch (win, ' ');

    wmove (win, choice, check_x);
    wattrset (win, selected ? check_selected_attr : check_attr);
    if (checkflag == FLAG_CHECK)
	wprintw (win, "[%c]", status ? 'X' : ' ');
    else
	wprintw (win, "(%c)", status ? 'X' : ' ');

    wattrset (win, selected ? tag_selected_attr : tag_attr);
    mvwaddch(win, choice, item_x, item[0]);
    wattrset (win, selected ? item_selected_attr : item_attr);
    waddstr (win, (char *)item+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, uarrow_attr);
	waddch (win, ACS_UARROW);
	waddstr (win, "(-)");
    }
    else {
	wattrset (win, menubox_attr);
	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, darrow_attr);
	waddch (win, ACS_DARROW);
	waddstr (win, "(+)");
    }
    else {
	wattrset (win, menubox_border_attr);
	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, "Select", y, x, selected == 0);
    print_button (dialog, " 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
 * The `flag' parameter is used to select between radiolist and checklist.
 */
int
dialog_checklist (const char *title, const char *prompt, int height, int width,
	int list_height, int item_no, struct dialog_list_item ** items,
	int flag)
	
{
    int i, x, y, box_x, box_y;
    int key = 0, button = 0, choice = 0, scroll = 0, max_choice, *status;
    WINDOW *dialog, *list;

    checkflag = flag;

    /* Allocate space for storing item on/off status */
    if ((status = malloc (sizeof (int) * item_no)) == NULL) {
	endwin ();
	fprintf (stderr,
		 "\nCan't allocate memory in dialog_checklist().\n");
	exit (-1);
    }

    /* Initializes status */
    for (i = 0; i < item_no; i++) {
	status[i] = items[i]->selected;
	if (!choice && status[i])
            choice = i;
    }

    max_choice = MIN (list_height, item_no);

    /* 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, dialog_attr, border_attr);
    wattrset (dialog, border_attr);
    mvwaddch (dialog, height-3, 0, ACS_LTEE);
    for (i = 0; i < width - 2; i++)
	waddch (dialog, ACS_HLINE);
    wattrset (dialog, dialog_attr);
    waddch (dialog, ACS_RTEE);

    if (title != NULL && strlen(title) >= width-2 ) {
	/* truncate long title -- mec */
	char * title2 = malloc(width-2+1);
	memcpy( title2, title, width-2 );
	title2[width-2] = '\0';
	title = title2;
    }

    if (title != NULL) {
	wattrset (dialog, title_attr);
	mvwaddch (dialog, 0, (width - strlen(title))/2 - 1, ' ');
	waddstr (dialog, (char *)title);
	waddch (dialog, ' ');
    }

    wattrset (dialog, dialog_attr);
    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,
	      menubox_border_attr, menubox_attr);

    /* Find length of longest item in order to center checklist */
    check_x = 0;
    for (i = 0; i < item_no; i++) 
	check_x = MAX (check_x, + strlen (items[i]->name) + 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++) {
	print_item (list, items[scroll + i]->name,
		    status[i+scroll], i, i == choice);
    }

    print_arrows(dialog, choice, item_no, scroll,
			box_y, box_x + check_x + 5, list_height);

    print_buttons(dialog, height, width, 0);

    wnoutrefresh (list);
    wnoutrefresh (dialog);
    doupdate ();

    while (key != ESC) {
	key = wgetch (dialog);

    	for (i = 0; i < max_choice; i++)
            if (toupper(key) == toupper(items[scroll + i]->name[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 */
			print_item (list, items[scroll]->name,
					status[scroll], 0, FALSE);
			scrollok (list, TRUE);
			wscrl (list, -1);
			scrollok (list, FALSE);
		    }
		    scroll--;
		    print_item (list, items[scroll]->name,
				status[scroll], 0, TRUE);
		    wnoutrefresh (list);

    		    print_arrows(dialog, choice, item_no, scroll,
				box_y, box_x + check_x + 5, list_height);

		    wrefresh (dialog);

		    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_no - 1)
			continue;
		    /* Scroll list up */
		    if (list_height > 1) {
			/* De-highlight current last item before scrolling up */
			print_item (list, items[scroll + max_choice - 1]->name,
				    status[scroll + max_choice - 1],
				    max_choice - 1, FALSE);
			scrollok (list, TRUE);
			scroll (list);
			scrollok (list, FALSE);
		    }
		    scroll++;
		    print_item (list, items[scroll + max_choice - 1]->name,
				status[scroll + max_choice - 1],
				max_choice - 1, TRUE);
		    wnoutrefresh (list);

    		    print_arrows(dialog, choice, item_no, scroll,
				box_y, box_x + check_x + 5, list_height);

		    wrefresh (dialog);

		    continue;	/* wait for another key press */
		} else
		    i = choice + 1;
	    }
	    if (i != choice) {
		/* De-highlight current item */
		print_item (list, items[scroll + choice]->name,
			    status[scroll + choice], choice, FALSE);
		/* Highlight new item */
		choice = i;
		print_item (list, items[scroll + choice]->name,
			    status[scroll + choice], choice, TRUE);
		wnoutrefresh (list);
		wrefresh (dialog);
	    }
	    continue;		/* wait for another key press */
	}
	switch (key) {
	case 'H':
	case 'h':
	case '?':
	    delwin (dialog);
	    free (status);
	    return 1;
	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 'S':
	case 's':
	case ' ':
	case '\n':
	    if (!button) {
		if (flag == FLAG_CHECK) {
		    status[scroll + choice] = !status[scroll + choice];
		    wmove (list, choice, check_x);
		    wattrset (list, check_selected_attr);
		    wprintw (list, "[%c]", status[scroll + choice] ? 'X' : ' ');
		} else {
		    if (!status[scroll + choice]) {
			for (i = 0; i < item_no; i++)
			    status[i] = 0;
			status[scroll + choice] = 1;
			for (i = 0; i < max_choice; i++)
			    print_item (list, items[scroll + i]->name,
					status[scroll + i], i, i == choice);
		    }
		}
		wnoutrefresh (list);
		wrefresh (dialog);
            
		for (i = 0; i < item_no; i++) {
			items[i]->selected = status[i];
		}
            }
	    delwin (dialog);
	    free (status);
	    return button;
	case 'X':
	case 'x':
	    key = ESC;
	case ESC:
	    break;
	}

	/* Now, update everything... */
	doupdate ();
    }
    

    delwin (dialog);
    free (status);
    return -1;			/* ESC pressed */
}