/*
 *  menubox.c -- implements the menu box
 *
 *  AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
 *
 *  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 void print_item(WINDOW *win, char *tag, char *item, int choice, int selected);


static int menu_width, tag_x, item_x;


/*
 * Display a menu for choosing among a number of options
 */
int dialog_menu(char *title, char *prompt, int height, int width, int menu_height, int item_no, char **items)
{
  int i, x, y, cur_x, cur_y, box_x, box_y, key = 0, button = 0, choice = 0,
      scroll = 0, max_choice;
  WINDOW *dialog, *menu;

  max_choice = MIN(menu_height, item_no);

  /* center dialog box on screen */
  x = (COLS - width)/2;
  y = (LINES - height)/2;
  
#ifdef HAVE_NCURSES
  if (use_shadow)
    draw_shadow(stdscr, y, x, height, width);
#endif
  dialog = newwin(height, width, y, x);
  keypad(dialog, TRUE);

  draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
  wattrset(dialog, border_attr);
  wmove(dialog, height-3, 0);
  waddch(dialog, ACS_LTEE);
  for (i = 0; i < width-2; i++)
    waddch(dialog, ACS_HLINE);
  wattrset(dialog, dialog_attr);
  waddch(dialog, ACS_RTEE);
  wmove(dialog, height-2, 1);
  for (i = 0; i < width-2; i++)
    waddch(dialog, ' ');

  if (title != NULL) {
    wattrset(dialog, title_attr);
    wmove(dialog, 0, (width - strlen(title))/2 - 1);
    waddch(dialog, ' ');
    waddstr(dialog, title);
    waddch(dialog, ' ');
  }
  wattrset(dialog, dialog_attr);
  print_autowrap(dialog, prompt, width, 1, 3);

  menu_width = width-6;
  getyx(dialog, cur_y, cur_x);
  box_y = cur_y + 1;
  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);

  tag_x = 0;
  item_x = 0;
  /* Find length of longest item in order to center menu */
  for (i = 0; i < item_no; i++) {
    tag_x = MAX(tag_x, strlen(items[i*2]) + strlen(items[i*2 + 1]) + 2);
    item_x = MAX(item_x, strlen(items[i*2]));
  }
  tag_x = (menu_width - tag_x) / 2;
  item_x = tag_x + item_x + 2;

  /* Print the menu */
  for (i = 0; i < max_choice; i++)
    print_item(menu, items[i*2], items[i*2 + 1], i, i == choice);
  wnoutrefresh(menu);

  if (menu_height < item_no) {
    wattrset(dialog, darrow_attr);
    wmove(dialog, box_y + menu_height + 1, box_x + tag_x + 1);
    waddch(dialog, ACS_DARROW);
    wmove(dialog, box_y + menu_height + 1, box_x + tag_x + 2);
    waddstr(dialog,"(+)");
  }

  x = width/2-11;
  y = height-2;
  print_button(dialog, "Cancel", y, x+14, FALSE);
  print_button(dialog, "  OK  ", y, x, TRUE);
  wrefresh(dialog);

  while (key != ESC) {
    key = wgetch(dialog);
    /* Check if key pressed matches first character of any item tag in menu */
    for (i = 0; i < max_choice; i++)
      if (toupper(key) == toupper(items[(scroll+i)*2][0]))
        break;
/*    i = (choice+scroll+1) % max_choice ;
    while (i != choice+scroll) {
      if (toupper(key) == toupper(items[i*2][0]))
	  break;
      i = (i + 1) % max_choice;
    }
    */

    if (i < max_choice || (key >= '1' && key <= MIN('9', '0'+max_choice)) || 
        key == KEY_UP || key == KEY_DOWN || key == '-' || key == '+') {
      if (key >= '1' && key <= MIN('9', '0'+max_choice))
        i = key - '1';
      else if (key == KEY_UP || key == '-') {
        if (!choice) {
          if (scroll) {
#ifdef BROKEN_WSCRL
    /* wscrl() in ncurses 1.8.1 seems to be broken, causing a segmentation
       violation when scrolling windows of height = 4, so scrolling is not
       used for now */
            scroll--;
            getyx(dialog, cur_y, cur_x);    /* Save cursor position */
            /* Reprint menu to scroll down */
            for (i = 0; i < max_choice; i++)
              print_item(menu, items[(scroll+i)*2], items[(scroll+i)*2 + 1], i, i == choice);

#else

            /* Scroll menu down */
            getyx(dialog, cur_y, cur_x);    /* Save cursor position */
            if (menu_height > 1) {
              /* De-highlight current first item before scrolling down */
              print_item(menu, items[scroll*2], items[scroll*2 + 1], 0, FALSE);
              scrollok(menu, TRUE);
              wscrl(menu, -1);
              scrollok(menu, FALSE);
            }
            scroll--;
            print_item(menu, items[scroll*2], items[scroll*2 + 1], 0, TRUE);
#endif
            wnoutrefresh(menu);

            /* print the up/down arrows */
            wmove(dialog, box_y, box_x + tag_x + 1);
            wattrset(dialog, scroll ? uarrow_attr : menubox_attr);
            waddch(dialog, scroll ? ACS_UARROW : ACS_HLINE);
            wmove(dialog, box_y, box_x + tag_x + 2);
            waddch(dialog, scroll ? '(' : ACS_HLINE);
            wmove(dialog, box_y, box_x + tag_x + 3);
            waddch(dialog, scroll ? '-' : ACS_HLINE);
            wmove(dialog, box_y, box_x + tag_x + 4);
            waddch(dialog, scroll ? ')' : ACS_HLINE);
            wattrset(dialog, darrow_attr);
            wmove(dialog, box_y + menu_height + 1, box_x + tag_x + 1);
            waddch(dialog, ACS_DARROW);
            wmove(dialog, box_y + menu_height + 1, box_x + tag_x + 2);
            waddstr(dialog,"(+)");
            wmove(dialog, cur_y, cur_x);  /* Restore cursor position */
            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) {
#ifdef BROKEN_WSCRL
    /* wscrl() in ncurses 1.8.1 seems to be broken, causing a segmentation
       violation when scrolling windows of height = 4, so scrolling is not
       used for now */
            scroll++;
            getyx(dialog, cur_y, cur_x);    /* Save cursor position */
            /* Reprint menu to scroll up */
            for (i = 0; i < max_choice; i++)
              print_item(menu, items[(scroll+i)*2], items[(scroll+i)*2 + 1], i, i == choice);

#else

            /* Scroll menu up */
            getyx(dialog, cur_y, cur_x);    /* Save cursor position */
            if (menu_height > 1) {
              /* De-highlight current last item before scrolling up */
              print_item(menu, items[(scroll+max_choice-1)*2], items[(scroll+max_choice-1)*2 + 1], max_choice-1, FALSE);
              scrollok(menu, TRUE);
              scroll(menu);
              scrollok(menu, FALSE);
            }
            scroll++;
              print_item(menu, items[(scroll+max_choice-1)*2], items[(scroll+max_choice-1)*2 + 1], max_choice-1, TRUE);
#endif
            wnoutrefresh(menu);

            /* print the up/down arrows */
            wattrset(dialog, uarrow_attr);
            wmove(dialog, box_y, box_x + tag_x + 1);
            waddch(dialog, ACS_UARROW);
            wmove(dialog, box_y, box_x + tag_x + 2);
            waddstr(dialog,"(-)");
            wmove(dialog, box_y + menu_height + 1, box_x + tag_x + 1);
            wattrset(dialog, scroll+choice < item_no-1 ? darrow_attr : menubox_border_attr);
            waddch(dialog, scroll+choice < item_no-1 ? ACS_DARROW : ACS_HLINE);
            wmove(dialog, box_y + menu_height + 1, box_x + tag_x + 2);
            waddch(dialog, scroll+choice < item_no-1 ? '(' : ACS_HLINE);
            wmove(dialog, box_y + menu_height + 1, box_x + tag_x + 3);
            waddch(dialog, scroll+choice < item_no-1 ? '+' : ACS_HLINE);
            wmove(dialog, box_y + menu_height + 1, box_x + tag_x + 4);
            waddch(dialog, scroll+choice < item_no-1 ? ')' : ACS_HLINE);
            wmove(dialog, cur_y, cur_x);  /* Restore cursor position */
            wrefresh(dialog);
          }
          continue;    /* wait for another key press */
        }
        else
          i = choice + 1;

      if (i != choice) {
        /* De-highlight current item */
        getyx(dialog, cur_y, cur_x);    /* Save cursor position */
        print_item(menu, items[(scroll+choice)*2], items[(scroll+choice)*2 + 1], choice, FALSE);

        /* Highlight new item */
        choice = i;
        print_item(menu, items[(scroll+choice)*2], items[(scroll+choice)*2 + 1], choice, TRUE);
        wnoutrefresh(menu);
        wmove(dialog, cur_y, cur_x);  /* Restore cursor to previous position */
        wrefresh(dialog);
      }
      continue;    /* wait for another key press */
    }

    switch (key) {
      case 'O':
      case 'o':
        delwin(dialog);
        fprintf(stderr, items[(scroll+choice)*2]);
        return 0;
      case 'C':
      case 'c':
        delwin(dialog);
        return 1;
      case TAB:
      case KEY_LEFT:
      case KEY_RIGHT:
        if (!button) {
          button = 1;    /* Indicates "Cancel" button is selected */
          print_button(dialog, "  OK  ", y, x, FALSE);
          print_button(dialog, "Cancel", y, x+14, TRUE);
        }
        else {
          button = 0;    /* Indicates "OK" button is selected */
          print_button(dialog, "Cancel", y, x+14, FALSE);
          print_button(dialog, "  OK  ", y, x, TRUE);
        }
        wrefresh(dialog);
        break;
      case ' ':
      case '\n':
        delwin(dialog);
        if (!button)
          fprintf(stderr, items[(scroll+choice)*2]);
        return button;
      case ESC:
        break;
    }
  }

  delwin(dialog);
  return -1;    /* ESC pressed */
}
/* End of dialog_menu() */


/*
 * Print menu item
 */
static void print_item(WINDOW *win, char *tag, char *item, int choice, int selected)
{
  int i;

  /* Clear 'residue' of last item */
  wattrset(win, menubox_attr);
  wmove(win, choice, 0);
  for (i = 0; i < menu_width; i++)
    waddch(win, ' ');
  wmove(win, choice, tag_x);
  wattrset(win, selected ? tag_key_selected_attr : tag_key_attr);
  waddch(win, tag[0]);
  wattrset(win, selected ? tag_selected_attr : tag_attr);
  waddstr(win, tag + 1);
  wmove(win, choice, item_x);
  wattrset(win, selected ? item_selected_attr : item_attr);
  waddstr(win, item);
}
/* End of print_item() */
