/*
 *  menubox.c -- implements the menu box
 *
 *  AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
 *
 *	Substantial rennovation:  12/18/95, Jordan K. Hubbard
 *
 *  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.
 *
 * $FreeBSD: src/gnu/lib/libdialog/menubox.c,v 1.35.2.1 2001/07/31 20:34:00 eric Exp $
 * $DragonFly: src/gnu/lib/libdialog/menubox.c,v 1.2 2003/06/17 04:25:43 dillon Exp $
 */

#include <dialog.h>
#include "dialog.priv.h"
#include <ncurses.h>

static void print_item(WINDOW *win, unsigned char *tag, unsigned char *item, int choice, int selected, dialogMenuItem *me, int menu_width, int tag_x, int item_x);

#define DREF(di, item)		((di) ? &((di)[(item)]) : NULL)

/*
 * Display a menu for choosing among a number of options
 */
int
dialog_menu(unsigned char *title, unsigned char *prompt, int height, int width, int menu_height, int cnt, void *it, unsigned char *result, int *ch, int *sc)
{
    int i, j, x, y, cur_x, cur_y, box_x, box_y, key = 0, button, choice,
	l, k, scroll, max_choice, item_no, redraw_menu = FALSE;
    char okButton, cancelButton;
    int rval = 0, ok_space, cancel_space;
    WINDOW *dialog, *menu;
    unsigned char **items = NULL;
    dialogMenuItem *ditems;
    int menu_width, tag_x, item_x;
    
draw:
    choice = ch ? *ch : 0;
    scroll = sc ? *sc : 0;
    button = 0;
    
    /* If item_no is a positive integer, use old item specification format */
    if (cnt >= 0) {
	items = it;
	ditems = NULL;
	item_no = cnt;
    }
    /* It's the new specification format - fake the rest of the code out */
    else {
	item_no = abs(cnt);
	ditems = it;
	if (!items)
	    items = (unsigned char **)alloca((item_no * 2) * sizeof(unsigned char *));
	
	/* Initializes status */
	for (i = 0; i < item_no; i++) {
	    items[i*2] = ditems[i].prompt;
	    items[i*2 + 1] = ditems[i].title;
	}
    }
    max_choice = MIN(menu_height, item_no);
    
    tag_x = 0;
    item_x = 0;
    /* Find length of longest item in order to center menu */
    for (i = 0; i < item_no; i++) {
	l = strlen(items[i * 2]);
	for (j = 0; j < item_no; j++) {
	    k = strlen(items[j * 2 + 1]);
	    tag_x = MAX(tag_x, l + k + 2);
	}
	item_x = MAX(item_x, l);
    }
    if (height < 0)
	height = strheight(prompt) + menu_height + 4 + 2;
    if (width < 0) {
	i = strwidth(prompt);
	j = ((title != NULL) ? strwidth(title) : 0);
	width = MAX(i, j);
	width = MAX(width, tag_x + 4) + 4;
    }
    width = MAX(width, 24);
    
    if (width > COLS)
	width = COLS;
    if (height > LINES)
	height = LINES;
    /* center dialog box on screen */
    x = DialogX ? DialogX : (COLS - width) / 2;
    y = DialogY ? DialogY : (LINES - height) / 2;
    
#ifdef HAVE_NCURSES
    if (use_shadow)
	draw_shadow(stdscr, y, x, height, width);
#endif
    dialog = newwin(height, width, y, x);
    if (dialog == NULL) {
	endwin();
	fprintf(stderr, "\nnewwin(%d,%d,%d,%d) failed, maybe wrong dims\n", height, width, y, x);
	return -1;
    }
    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);
    wmove(dialog, 1, 2);
    print_autowrap(dialog, prompt, height - 1, width - 2, width, 1, 2, TRUE, FALSE);
    
    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);
    if (menu == NULL) {
	delwin(dialog);
	endwin();
	fprintf(stderr, "\nsubwin(dialog,%d,%d,%d,%d) failed, maybe wrong dims\n", menu_height, menu_width,
		y + box_y + 1, x + box_x + 1);
	return -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 = menu_width > tag_x + 1 ? (menu_width - tag_x) / 2 : 1;
    item_x = menu_width > item_x + 4 ? tag_x + item_x + 2 : menu_width - 3;
    
    /* Print the menu */
    for (i = 0; i < max_choice; i++)
	print_item(menu, items[(scroll + i) * 2], items[(scroll + i) * 2 + 1], i, i == choice, DREF(ditems, scroll + i), menu_width, tag_x, item_x);
    wnoutrefresh(menu);
    print_arrows(dialog, scroll, menu_height, item_no, box_x, box_y, tag_x, cur_x, cur_y);
    
    display_helpline(dialog, height - 1, width);
    
    x = width / 2 - 11;
    y = height - 2;
    
    if (ditems && result) {
	cancelButton = toupper(ditems[CANCEL_BUTTON].prompt[0]);
	print_button(dialog, ditems[CANCEL_BUTTON].prompt, y, x + strlen(ditems[OK_BUTTON].prompt) + 5, ditems[CANCEL_BUTTON].checked ? ditems[CANCEL_BUTTON].checked(&ditems[CANCEL_BUTTON]) : FALSE);
	okButton = toupper(ditems[OK_BUTTON].prompt[0]);
	print_button(dialog, ditems[OK_BUTTON].prompt, y, x, ditems[OK_BUTTON].checked ? ditems[OK_BUTTON].checked(&ditems[OK_BUTTON]) : TRUE);
    }
    else {
	cancelButton = 'C';
	print_button(dialog, "Cancel", y, x + 14, FALSE);
	okButton = 'O';
	print_button(dialog, "  OK  ", y, x, TRUE);
    }
    
    wrefresh(dialog);
    while (key != ESC) {
	key = wgetch(dialog);
	
	/* Shortcut to OK? */
	if (toupper(key) == okButton) {
	    if (ditems) {
		if (result && ditems[OK_BUTTON].fire) {
		    int status;
		    WINDOW *save;

		    save = dupwin(newscr);
		    status = ditems[OK_BUTTON].fire(&ditems[OK_BUTTON]);
		    if (status & DITEM_RESTORE) {
			touchwin(save);
			wrefresh(save);
		    }
		    delwin(save);
		}
	    }
	    else if (result)
		strcpy(result, items[(scroll + choice) * 2]);
	    rval = 0;
	    key = ESC;	/* Punt! */
	    break;
	}

	/* Shortcut to cancel? */
	if (toupper(key) == cancelButton) {
	    if (ditems && result && ditems[CANCEL_BUTTON].fire) {
		int status;
		WINDOW *save;

		save = dupwin(newscr);
		status = ditems[CANCEL_BUTTON].fire(&ditems[CANCEL_BUTTON]);
		if (status & DITEM_RESTORE) {
		    touchwin(save);
		    wrefresh(save);
		}
		delwin(save);
	    }
	    rval = 1;
	    key = ESC;	/* Run away! */
	    break;
	}

	/* Check if key pressed matches first character of any item tag in menu */
	for (i = 0; i < max_choice; i++)	
	    if (key < 0x100 && key != ' ' && toupper(key) == toupper(items[(scroll + i) * 2][0]))
		break;

	if (i < max_choice || (key >= '1' && key <= MIN('9', '0'+max_choice)) || KEY_IS_UP(key) || KEY_IS_DOWN(key)) {
	    if (key >= '1' && key <= MIN('9', '0'+max_choice))
		i = key - '1';
	    else if (KEY_IS_UP(key)) {
		if (!choice) {
		    if (scroll) {
			/* 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, DREF(ditems, scroll), menu_width, tag_x, item_x);
			    scrollok(menu, TRUE);
			    wscrl(menu, -1);
			    scrollok(menu, FALSE);
			}
			scroll--;
			print_item(menu, items[scroll * 2], items[scroll * 2 + 1], 0, TRUE, DREF(ditems, scroll), menu_width, tag_x, item_x);
			wnoutrefresh(menu);
			print_arrows(dialog, scroll, menu_height, item_no, box_x, box_y, tag_x, cur_x, cur_y);
			wrefresh(dialog);
		    }
		    continue;    /* wait for another key press */
		}
		else
		    i = choice - 1;
	    }
	    else if (KEY_IS_DOWN(key)) {
		if (choice == max_choice - 1) {
		    if (scroll + choice < item_no - 1) {
			/* 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, DREF(ditems, scroll + max_choice - 1), menu_width, tag_x, item_x);
			    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, DREF(ditems, scroll + max_choice - 1), menu_width, tag_x, item_x);
			wnoutrefresh(menu);
			print_arrows(dialog, scroll, menu_height, item_no, box_x, box_y, tag_x, cur_x, cur_y);
			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, DREF(ditems, scroll + choice), menu_width, tag_x, item_x);
		
		/* Highlight new item */
		choice = i;
		print_item(menu, items[(scroll + choice) * 2], items[(scroll + choice) * 2 + 1], choice, TRUE, DREF(ditems, scroll + choice), menu_width, tag_x, item_x);
		wnoutrefresh(menu);
		wmove(dialog, cur_y, cur_x);  /* Restore cursor to previous position */
		wrefresh(dialog);
	    }
	    continue;    /* wait for another key press */
	}
	
	switch (key) {
	case KEY_PPAGE:
	    if (scroll > height - 4) {	/* can we go up? */
		scroll -= (height - 4);
	    } else {
		scroll = 0;
	    }
	    redraw_menu = TRUE;
	    break;
	    
	case KEY_NPAGE:
	    if (scroll + menu_height >= item_no-1 - menu_height) { /* can we go down a full page? */
		scroll = item_no - menu_height;
		if (scroll < 0)
		    scroll = 0;
	    } else {
		scroll += menu_height;
	    }
	    redraw_menu = TRUE;
	    break;
	    
	case KEY_HOME:
	    scroll = 0;
	    choice = 0;
	    redraw_menu = TRUE;
	    break;
	    
	case KEY_END:
	    scroll = item_no - menu_height;
	    if (scroll < 0)
		scroll = 0;
	    choice = max_choice - 1;
	    redraw_menu = TRUE;
	    break;
	    
	case KEY_BTAB:
	case TAB:
	case KEY_LEFT:
	case KEY_RIGHT:
	    button = !button;
	    if (ditems && result) {
		print_button(dialog, ditems[CANCEL_BUTTON].prompt, y, x + strlen(ditems[OK_BUTTON].prompt) + 5, ditems[CANCEL_BUTTON].checked ? ditems[CANCEL_BUTTON].checked(&ditems[CANCEL_BUTTON]) : button);
		print_button(dialog, ditems[OK_BUTTON].prompt, y, x, ditems[OK_BUTTON].checked ? ditems[OK_BUTTON].checked(&ditems[OK_BUTTON]) : !button);
		ok_space = 1;
		cancel_space = strlen(ditems[OK_BUTTON].prompt) + 6;
	    }
	    else {
		print_button(dialog, "Cancel", y, x + 14, button);
		print_button(dialog, "  OK  ", y, x, !button);
		ok_space = 3;
		cancel_space = 15;
	    }
	    if (button)
		wmove(dialog, y, x+cancel_space);
	    else
		wmove(dialog, y, x+ok_space);
	    wrefresh(dialog);
	    break;
	    
	case ' ':
	case '\r':
	case '\n':
	    if (!button) {
		/* A fire routine can do just about anything to the screen, so be prepared
		   to accept some hints as to what to do in the aftermath. */
		if (ditems) {
		    if (ditems[scroll + choice].fire) {
			int status;
			WINDOW *save;

			save = dupwin(newscr);
			status = ditems[scroll + choice].fire(&ditems[scroll + choice]);
			if (status & DITEM_RESTORE) {
			    touchwin(save);
			    wrefresh(save);
			}
			delwin(save);
			if (status & DITEM_CONTINUE)
			    continue;
			else if (status & DITEM_LEAVE_MENU) {
			    /* Allow a fire action to take us out of the menu */
			    key = ESC;
			    break;
			}
			else if (status & DITEM_RECREATE) {
			    delwin(menu);
			    delwin(dialog);
			    dialog_clear();
			    goto draw;
			}
		    }
		}
		else if (result)
		    strcpy(result, items[(scroll+choice)*2]);
	    }
	    rval = button;
	    key = ESC;
	    break;
	    
	case ESC:
	    rval = -1;
	    break;
	    
	case KEY_F(1):
	case '?':
	    display_helpfile();
	    break;
	}
	
	/* save info about menu item position */
	if (ch)
	    *ch = choice;
	if (sc)
	    *sc = scroll;
	
	if (redraw_menu) {
	    for (i = 0; i < max_choice; i++) {
		print_item(menu, items[(scroll + i) * 2], items[(scroll + i) * 2 + 1], i, i == choice, DREF(ditems, scroll + i), menu_width, tag_x, item_x);
	    }
	    wnoutrefresh(menu);
	    getyx(dialog, cur_y, cur_x);    /* Save cursor position */
	    print_arrows(dialog, scroll, menu_height, item_no, box_x, box_y, tag_x, cur_x, cur_y);
	    wmove(dialog, cur_y, cur_x);  /* Restore cursor to previous position */
	    wrefresh(dialog);
	    redraw_menu = FALSE;
	}
    }
    delwin(menu);
    delwin(dialog);
    return rval;
}


/*
 * Print menu item
 */
static void
print_item(WINDOW *win, unsigned char *tag, unsigned char *item, int choice, int selected, dialogMenuItem *me, int menu_width, int tag_x, int item_x)
{
    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);
    waddnstr(win, tag + 1, item_x - tag_x - 3);
    wmove(win, choice, item_x);
    wattrset(win, selected ? item_selected_attr : item_attr);
    waddnstr(win, item, menu_width - item_x - 1);
    /* If have a selection handler for this, call it */
    if (me && me->selected) {
	wrefresh(win);
	me->selected(me, selected);
    }
}
/* End of print_item() */