/*
 *  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);
    if (!item_is_tag(':'))
        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 */
}
