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/*

 *  menubox.c -- implements the menu box

 *

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

 *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcapw@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.

 */

/*

 *  Changes by Clifford Wolf (god@clifford.at)

 *

 *  [ 1998-06-13 ]

 *

 *    *)  A bugfix for the Page-Down problem

 *

 *    *)  Formerly when I used Page Down and Page Up, the cursor would be set

 *        to the first position in the menu box.  Now lxdialog is a bit

 *        smarter and works more like other menu systems (just have a look at

 *        it).

 *

 *    *)  Formerly if I selected something my scrolling would be broken because

 *        lxdialog is re-invoked by the Menuconfig shell script, can't

 *        remember the last scrolling position, and just sets it so that the

 *        cursor is at the bottom of the box.  Now it writes the temporary file

 *        lxdialog.scrltmp which contains this information. The file is

 *        deleted by lxdialog if the user leaves a submenu or enters a new

 *        one, but it would be nice if Menuconfig could make another "rm -f"

 *        just to be sure.  Just try it out - you will recognise a difference!

 *

 *  [ 1998-06-14 ]

 *

 *    *)  Now lxdialog is crash-safe against broken "lxdialog.scrltmp" files

 *        and menus change their size on the fly.

 *

 *    *)  If for some reason the last scrolling position is not saved by

 *        lxdialog, it sets the scrolling so that the selected item is in the

 *        middle of the menu box, not at the bottom.

 *

 * 02 January 1999, Michael Elizabeth Chastain (mec@shout.net)

 * Reset 'scroll' to 0 if the value from lxdialog.scrltmp is bogus.

 * This fixes a bug in Menuconfig where using ' ' to descend into menus

 * would leave mis-synchronized lxdialog.scrltmp files lying around,

 * fscanf would read in 'scroll', and eventually that value would get used.

 */

#include "dialog.h"

static int menu_width, item_x;

/*

 * Print menu item

 */

static void

print_item (WINDOW * win, const char *item, int choice, int selected, int hotkey)

{

    int j;

    char menu_item[menu_width+1];

    strncpy(menu_item, item, menu_width);

    menu_item[menu_width] = 0;

    j = first_alpha(menu_item, "YyNnMm");

    /* Clear 'residue' of last item */

    wattrset (win, menubox_attr);

    wmove (win, choice, 0);

#if OLD_NCURSES

    {

        int i;

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

            waddch (win, ' ');

    }

#else

    wclrtoeol(win);

#endif

    wattrset (win, selected ? item_selected_attr : item_attr);

    mvwaddstr (win, choice, item_x, menu_item);

    if (hotkey) {

        wattrset (win, selected ? tag_key_selected_attr : tag_key_attr);

        mvwaddch(win, choice, item_x+j, menu_item[j]);

    }

    if (selected) {

        wmove (win, choice, item_x+1);

        wrefresh (win);

    }

}

/*

 * Print the scroll indicators.

 */

static void

print_arrows (WINDOW * win, int item_no, int scroll,

                int y, int x, int height)

{

    int cur_y, cur_x;

    getyx(win, cur_y, cur_x);

    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 + height < item_no)) {

        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);

   }

   wmove(win, cur_y, cur_x);

}

/*

 * Display the termination buttons.

 */

static void

print_buttons (WINDOW *win, int height, int width, int selected)

{

    int x = width / 2 - 16;

    int y = height - 2;

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

    print_button (win, " Exit ", y, x + 12, selected == 1);

    print_button (win, " Help ", y, x + 24, selected == 2);

    wmove(win, y, x+1+12*selected);

    wrefresh (win);

}

/*

 * Display a menu for choosing among a number of options

 */

int

dialog_menu (const char *title, const char *prompt, int height, int width,

                int menu_height, const char *current, int item_no,

                struct dialog_list_item ** items)

{

    int i, j, x, y, box_x, box_y;

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

    WINDOW *dialog, *menu;

    FILE *f;

    max_choice = MIN (menu_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);

    wbkgdset (dialog, dialog_attr & A_COLOR);

    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);

    menu_width = width - 6;

    box_y = height - menu_height - 5;

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

    /* create new window for the menu */

    menu = subwin (dialog, menu_height, menu_width,

                y + box_y + 1, x + box_x + 1);

    keypad (menu, TRUE);

    /* draw a box around the menu items */

    draw_box (dialog, box_y, box_x, menu_height + 2, menu_width + 2,

              menubox_border_attr, menubox_attr);

    /*

     * Find length of longest item in order to center menu.

     * Set 'choice' to default item.

     */

    item_x = 0;

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

        item_x = MAX (item_x, MIN(menu_width, strlen (items[i]->name) + 2));

        if (strcmp(current, items[i]->tag) == 0) choice = i;

    }

    item_x = (menu_width - item_x) / 2;

    /* get the scroll info from the temp file */

    if ( (f=fopen("lxdialog.scrltmp","r")) != NULL ) {

        if ( (fscanf(f,"%d\n",&scroll) == 1) && (scroll <= choice) &&

             (scroll+max_choice > choice) && (scroll >= 0) &&

             (scroll+max_choice <= item_no) ) {

            first_item = scroll;

            choice = choice - scroll;

            fclose(f);

        } else {

            scroll=0;

            remove("lxdialog.scrltmp");

            fclose(f);

            f=NULL;

        }

    }

    if ( (choice >= max_choice) || (f==NULL && choice >= max_choice/2) ) {

        if (choice >= item_no-max_choice/2)

            scroll = first_item = item_no-max_choice;

        else

            scroll = first_item = choice - max_choice/2;

        choice = choice - scroll;

    }

    /* Print the menu */

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

        print_item (menu, items[first_item + i]->name, i, i == choice,

                    (items[first_item + i]->tag[0] != ':'));

    }

    wnoutrefresh (menu);

    print_arrows(dialog, item_no, scroll,

                 box_y, box_x+item_x+1, menu_height);

    print_buttons (dialog, height, width, 0);

    wmove (menu, choice, item_x+1);

    wrefresh (menu);

    while (key != ESC) {

        key = wgetch(menu);

        if (key < 256 && isalpha(key)) key = tolower(key);

        if (strchr("ynm", key))

                i = max_choice;

        else {

        for (i = choice+1; i < max_choice; i++) {

                j = first_alpha(items[scroll + i]->name, "YyNnMm>");

                if (key == tolower(items[scroll + i]->name[j]))

                        break;

        }

        if (i == max_choice)

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

                        j = first_alpha(items[scroll + i]->name, "YyNnMm>");

                        if (key == tolower(items[scroll + i]->name[j]))

                                break;

                }

        }

        if (i < max_choice ||

            key == KEY_UP || key == KEY_DOWN ||

            key == '-' || key == '+' ||

            key == KEY_PPAGE || key == KEY_NPAGE) {

            print_item (menu, items[scroll + choice]->name, choice, FALSE,

                       (items[scroll + choice]->tag[0] != ':'));

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

                if (choice < 2 && scroll) {

                    /* Scroll menu down */

                    scrollok (menu, TRUE);

                    wscrl (menu, -1);

                    scrollok (menu, FALSE);

                    scroll--;

                    print_item (menu, items[scroll]->name, 0, FALSE,

                               (items[scroll]->tag[0] != ':'));

                } else

                    choice = MAX(choice - 1, 0);

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

                print_item (menu, items[scroll + choice]->name, choice, FALSE,

                                (items[scroll + choice]->tag[0] != ':'));

                if ((choice > max_choice-3) &&

                    (scroll + max_choice < item_no)

                   ) {

                    /* Scroll menu up */

                    scrollok (menu, TRUE);

                    scroll (menu);

                    scrollok (menu, FALSE);

                    scroll++;

                    print_item (menu, items[scroll + max_choice - 1]->name,

                               max_choice-1, FALSE,

                               (items[scroll + max_choice - 1]->tag[0] != ':'));

                } else

                    choice = MIN(choice+1, max_choice-1);

            } else if (key == KEY_PPAGE) {

                scrollok (menu, TRUE);

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

                    if (scroll > 0) {

                        wscrl (menu, -1);

                        scroll--;

                        print_item (menu, items[scroll]->name, 0, FALSE,

                        (items[scroll]->tag[0] != ':'));

                    } else {

                        if (choice > 0)

                            choice--;

                    }

                }

                scrollok (menu, FALSE);

            } else if (key == KEY_NPAGE) {

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

                    if (scroll+max_choice < item_no) {

                        scrollok (menu, TRUE);

                        scroll(menu);

                        scrollok (menu, FALSE);

                        scroll++;

                        print_item (menu, items[scroll + max_choice - 1]->name,

                                    max_choice-1, FALSE,

                                    (items[scroll + max_choice - 1]->tag[0] != ':'));

                    } else {

                        if (choice+1 < max_choice)

                            choice++;

                    }

                }

            } else

                choice = i;

            print_item (menu, items[scroll + choice]->name, choice, TRUE,

                       (items[scroll + choice]->tag[0] != ':'));

            print_arrows(dialog, item_no, scroll,

                         box_y, box_x+item_x+1, menu_height);

            wnoutrefresh (dialog);

            wrefresh (menu);

            continue;           /* wait for another key press */

        }

        switch (key) {

        case KEY_LEFT:

        case TAB:

        case KEY_RIGHT:

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

                        ? 2 : (button > 2 ? 0 : button);

            print_buttons(dialog, height, width, button);

            wrefresh (menu);

            break;

        case ' ':

        case 's':

        case 'y':

        case 'n':

        case 'm':

            /* save scroll info */

            if ( (f=fopen("lxdialog.scrltmp","w")) != NULL ) {

                fprintf(f,"%d\n",scroll);

                fclose(f);

            }

            delwin (dialog);

            items[scroll + choice]->selected = 1;

            switch (key) {

            case 's': return 3;

            case 'y': return 3;

            case 'n': return 4;

            case 'm': return 5;

            case ' ': return 6;

            }

            return 0;

        case 'h':

        case '?':

            button = 2;

        case '\n':

            delwin (dialog);

            items[scroll + choice]->selected = 1;

            remove("lxdialog.scrltmp");

            return button;

        case 'e':

        case 'x':

            key = ESC;

        case ESC:

            break;

        }

    }

    delwin (dialog);

    remove("lxdialog.scrltmp");

    return -1;                  /* ESC pressed */

}