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/*

 *  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 */

}