/* Functionality for a bar across the bottom of the screen listing the
 * windows currently managed. 
 *  
 * Copyright (C) 2000 Shawn Betts
 * 
 * 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, 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 software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA */

#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "ratpoison.h"

/* Possible values for bar_is_raised status. */
#define BAR_IS_WINDOW_LIST 1
#define BAR_IS_MESSAGE     2

/* Hide the bar from sight. */
int
hide_bar (screen_info *s)
{
  if (s->bar_is_raised)
    {
      s->bar_is_raised = 0;
      XUnmapWindow (dpy, s->bar_window);
      return 1;
    }

  return 0;
}

/* Show window listing in bar. */
int
show_bar (screen_info *s)
{
  if (!s->bar_is_raised)
    {
      s->bar_is_raised = BAR_IS_WINDOW_LIST;
      XMapWindow (dpy, s->bar_window);
      update_window_names (s);
  
      /* Set an alarm to auto-hide the bar BAR_TIMEOUT seconds later */
      alarm (BAR_TIMEOUT);
      return 1;
    }

  /* If the bar is raised we still need to display the window
     names. */
  update_window_names (s);
  return 0;
}

/* Calculate the width required for the bar to display the window
   list. */
static int
calc_bar_width (XFontStruct *font)
{
  char str[100];		/* window names are capped at 99 chars */
  int size = 1;
  rp_window *cur;

  for (cur = rp_window_head; cur; cur = cur->next)
    {
      if (cur->state == STATE_UNMAPPED) continue;
      
      sprintf (str, "%d-%s", cur->number, cur->name);
      size += 10 + XTextWidth (font, str, strlen (str));
    }

  return size;
}

int
bar_x (screen_info *s, int width)
{
  if (BAR_LOCATION >= 2) return s->root_attr.width - width - 2;
  else return 0;
}

int
bar_y (screen_info *s)
{
  if (BAR_LOCATION % 2) return 0;
  else return s->root_attr.height - (FONT_HEIGHT (s->font) + BAR_Y_PADDING * 2) - 2;
}

void
update_window_names (screen_info *s)
{
  char str[100];		/* window names are capped at 99 chars */
  int width = calc_bar_width (s->font);
  rp_window *cur;
  int cur_x = BAR_X_PADDING;

  if (!s->bar_is_raised) return;

  XMoveResizeWindow (dpy, s->bar_window, 
		     bar_x (s, width), bar_y (s),
		     width,
		     (FONT_HEIGHT (s->font) + BAR_Y_PADDING * 2));
  XClearWindow (dpy, s->bar_window);
  XRaiseWindow (dpy, s->bar_window);

  if (rp_window_head == NULL) return;

  /* Draw them in reverse order they were added in, so the oldest
     windows appear on the left and the newest on the right end of the
     bar. */
  for (cur = rp_window_head; cur; cur = cur->next) 
    {
      if (cur->state == STATE_UNMAPPED) continue;

      sprintf (str, "%d-%s", cur->number, cur->name);
      if ( rp_current_window == cur) 
	{
	  XDrawString (dpy, s->bar_window, s->bold_gc, cur_x, 
		       BAR_Y_PADDING + s->font->max_bounds.ascent, str, 
		       strlen (str));
	}
      else
	{
	  XDrawString (dpy, s->bar_window, s->normal_gc, cur_x, 
		       BAR_Y_PADDING + s->font->max_bounds.ascent, str, 
		       strlen (str));
	}

      cur_x += 10 + XTextWidth (s->font, str, strlen (str));
    }
}

void
display_msg_in_bar (screen_info *s, char *msg)
{
  int width = BAR_X_PADDING * 2 + XTextWidth (s->font, msg, strlen (msg));

  /* Map the bar if needed */
  if (!s->bar_is_raised)
    {
      s->bar_is_raised = BAR_IS_MESSAGE;
      XMapWindow (dpy, s->bar_window);
    }

  /* Reset the alarm to auto-hide the bar in BAR_TIMEOUT seconds. */
  alarm (BAR_TIMEOUT);

  XMoveResizeWindow (dpy, s->bar_window, 
		     bar_x (s, width), bar_y (s),
		     width,
		     (FONT_HEIGHT (s->font) + BAR_Y_PADDING * 2));
  XClearWindow (dpy, s->bar_window);
  XRaiseWindow (dpy, s->bar_window);

  XDrawString (dpy, s->bar_window, s->bold_gc, BAR_X_PADDING, 
	       BAR_Y_PADDING + s->font->max_bounds.ascent, msg, 
	       strlen (msg));
}