/* Emulate the X Resource Manager through the registry.
   Copyright (C) 1990, 1993, 1994, 2001, 2002, 2003, 2004,
                 2005, 2006, 2007, 2008, 2009  Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs 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 3 of the License, or
(at your option) any later version.

GNU Emacs 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 GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */

/* Written by Kevin Gallo */

#include <config.h>
#include "lisp.h"
#include "w32term.h"
#include "blockinput.h"

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

#define REG_ROOT "SOFTWARE\\GNU\\Emacs"

/* Default system colors from the Display Control Panel settings.  */
#define SYSTEM_DEFAULT_RESOURCES                          \
  "emacs.foreground:SystemWindowText\0"			  \
  "emacs.background:SystemWindow\0"                       \
  "emacs.tooltip.attributeForeground:SystemInfoText\0"    \
  "emacs.tooltip.attributeBackground:SystemInfoWindow\0"  \
  "emacs.tool-bar.attributeForeground:SystemButtonText\0" \
  "emacs.tool-bar.attributeBackground:SystemButtonFace\0" \
  "emacs.menu.attributeForeground:SystemMenuText\0"       \
  "emacs.menu.attributeBackground:SystemMenu\0"           \
  "emacs.scroll-bar.attributeForeground:SystemScrollbar\0"

/* Other possibilities for default faces:

  region: Could use SystemHilight, but interferes with our ability to
  see most syntax highlighting through the region face.

  modeline: Could use System(In)ActiveTitle, gradient versions (not
  supported on 95 and NT), but modeline is more like a status bar
  really (which don't appear to be configurable in Windows).

  highlight: Could use SystemHotTrackingColor, but it is not supported
  on Windows 95 or NT, and other apps only seem to use it for menus
  anyway.

*/

static char *
w32_get_rdb_resource (rdb, resource)
     char *rdb;
     char *resource;
{
  char *value = rdb;
  int len = strlen (resource);

  while (*value)
    {
      /* Comparison is case-insensitive because registry searches are too.  */
      if ((strnicmp (value, resource, len) == 0) && (value[len] == ':'))
        return xstrdup (&value[len + 1]);

      value = strchr (value, '\0') + 1;
    }

  return NULL;
}

LPBYTE
w32_get_string_resource (name, class, dwexptype)
     char *name, *class;
     DWORD dwexptype;
{
  LPBYTE lpvalue = NULL;
  HKEY hrootkey = NULL;
  DWORD dwType;
  DWORD cbData;
  BOOL ok = FALSE;
  HKEY hive = HKEY_CURRENT_USER;

 trykey:

  BLOCK_INPUT;

  /* Check both the current user and the local machine to see if we have
     any resources */

  if (RegOpenKeyEx (hive, REG_ROOT, 0, KEY_READ, &hrootkey) == ERROR_SUCCESS)
    {
      char *keyname;

      if (RegQueryValueEx (hrootkey, name, NULL, &dwType, NULL, &cbData) == ERROR_SUCCESS
	  && dwType == dwexptype)
	{
	  keyname = name;
	}
      else if (RegQueryValueEx (hrootkey, class, NULL, &dwType, NULL, &cbData) == ERROR_SUCCESS
	       && dwType == dwexptype)
	{
	  keyname = class;
	}
      else
	{
	  keyname = NULL;
	}

      ok = (keyname
	    && (lpvalue = (LPBYTE) xmalloc (cbData)) != NULL
	    && RegQueryValueEx (hrootkey, keyname, NULL, NULL, lpvalue, &cbData) == ERROR_SUCCESS);

      RegCloseKey (hrootkey);
    }

  UNBLOCK_INPUT;

  if (!ok)
    {
      if (lpvalue)
	{
	  xfree (lpvalue);
	  lpvalue = NULL;
	}
      if (hive == HKEY_CURRENT_USER)
	{
	  hive = HKEY_LOCAL_MACHINE;
	  goto trykey;
	}

      /* Check if there are Windows specific defaults defined.  */
      return w32_get_rdb_resource (SYSTEM_DEFAULT_RESOURCES, name);
    }
  return (lpvalue);
}

/* Retrieve the string resource specified by NAME with CLASS from
   database RDB. */

char *
x_get_string_resource (rdb, name, class)
     XrmDatabase rdb;
     char *name, *class;
{
  if (rdb)
    {
      char *resource;

      if (resource = w32_get_rdb_resource (rdb, name))
        return resource;
      if (resource = w32_get_rdb_resource (rdb, class))
        return resource;
    }

  return (w32_get_string_resource (name, class, REG_SZ));
}

/* arch-tag: 755fce25-42d7-4acb-874f-2fb42336823d
   (do not change this comment) */
