/* GDK - The GIMP Drawing Kit
 * Copyright (C) 2002,2005 Hans Breuer
 * Copyright (C) 2003 Tor Lillqvist
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include <config.h>
#include "gdk.h"
#include "gdkprivate-win32.h"

#define HAVE_MONITOR_INFO

#if defined(_MSC_VER) && (WINVER < 0x500) && (WINVER > 0x0400)
#include <multimon.h>
#elif defined(_MSC_VER) && (WINVER <= 0x0400)
#undef HAVE_MONITOR_INFO
#endif

#ifdef HAVE_MONITOR_INFO
typedef BOOL (WINAPI *t_EnumDisplayMonitors)(HDC, LPCRECT, MONITORENUMPROC, LPARAM);
typedef BOOL (WINAPI *t_GetMonitorInfoA)(HMONITOR, LPMONITORINFO);

static t_EnumDisplayMonitors p_EnumDisplayMonitors = NULL;
static t_GetMonitorInfoA p_GetMonitorInfoA = NULL;
#endif

void
_gdk_windowing_set_default_display (GdkDisplay *display)
{
  g_assert (_gdk_display == display);
}

#ifdef HAVE_MONITOR_INFO
static BOOL CALLBACK
count_monitor (HMONITOR hmonitor,
	       HDC      hdc,
	       LPRECT   rect,
	       LPARAM   data)
{
  gint *n = (gint *) data;

  (*n)++;

  return TRUE;
}

static BOOL CALLBACK
enum_monitor (HMONITOR hmonitor,
	      HDC      hdc,
	      LPRECT   rect,
	      LPARAM   data)
{
  MONITORINFOEX monitor_info;
  HDC hDC;

  gint *index = (gint *) data;
  GdkWin32Monitor *monitor;

  g_assert (*index < _gdk_num_monitors);

  monitor = _gdk_monitors + *index;

  monitor_info.cbSize = sizeof (MONITORINFOEX);
  (*p_GetMonitorInfoA) (hmonitor, (MONITORINFO *) &monitor_info);

#ifndef MONITORINFOF_PRIMARY
#define MONITORINFOF_PRIMARY 1
#endif

  monitor->name = g_strdup (monitor_info.szDevice);
  hDC = CreateDCA ("DISPLAY", monitor_info.szDevice, NULL, NULL);
  monitor->width_mm = GetDeviceCaps (hDC, HORZSIZE);
  monitor->height_mm = GetDeviceCaps (hDC, VERTSIZE);
  DeleteDC (hDC);
  monitor->rect.x = monitor_info.rcMonitor.left;
  monitor->rect.y = monitor_info.rcMonitor.top;
  monitor->rect.width = monitor_info.rcMonitor.right - monitor_info.rcMonitor.left;
  monitor->rect.height = monitor_info.rcMonitor.bottom - monitor_info.rcMonitor.top;

  if (monitor_info.dwFlags & MONITORINFOF_PRIMARY &&
      *index != 0)
    {
      /* Put primary monitor at index 0, just in case somebody needs
       * to know which one is the primary.
       */
      GdkWin32Monitor temp = *monitor;
      *monitor = _gdk_monitors[0];
      _gdk_monitors[0] = temp;
    }

  (*index)++;

  return TRUE;
}
#endif /* HAVE_MONITOR_INFO */

void
_gdk_monitor_init (void)
{
#ifdef HAVE_MONITOR_INFO
  static HMODULE user32 = NULL;

  if (user32 == NULL)
    {
      user32 = GetModuleHandle ("user32.dll");

      g_assert (user32 != NULL);

      p_EnumDisplayMonitors = (t_EnumDisplayMonitors) GetProcAddress (user32, "EnumDisplayMonitors");
      p_GetMonitorInfoA = (t_GetMonitorInfoA) GetProcAddress (user32, "GetMonitorInfoA");
    }

  if (p_EnumDisplayMonitors != NULL && p_GetMonitorInfoA != NULL)
    {
      gint i, index;

      _gdk_num_monitors = 0;

      (*p_EnumDisplayMonitors) (NULL, NULL, count_monitor, (LPARAM) &_gdk_num_monitors);

      _gdk_monitors = g_renew (GdkWin32Monitor, _gdk_monitors, _gdk_num_monitors);

      index = 0;
      (*p_EnumDisplayMonitors) (NULL, NULL, enum_monitor, (LPARAM) &index);

      _gdk_offset_x = G_MININT;
      _gdk_offset_y = G_MININT;

      /* Calculate offset */
      for (i = 0; i < _gdk_num_monitors; i++)
        {
          _gdk_offset_x = MAX (_gdk_offset_x, -_gdk_monitors[i].rect.x);
          _gdk_offset_y = MAX (_gdk_offset_y, -_gdk_monitors[i].rect.y);
        }
      GDK_NOTE (MISC, g_print ("Multi-monitor offset: (%d,%d)\n",
                               _gdk_offset_x, _gdk_offset_y));

      /* Translate monitor coords into GDK coordinate space */
      for (i = 0; i < _gdk_num_monitors; i++)
        {
          _gdk_monitors[i].rect.x += _gdk_offset_x;
          _gdk_monitors[i].rect.y += _gdk_offset_y;
          GDK_NOTE (MISC, g_print ("Monitor %d: %dx%d@%+d%+d\n",
                                   i, _gdk_monitors[i].rect.width,
                                   _gdk_monitors[i].rect.height,
                                   _gdk_monitors[i].rect.x,
                                   _gdk_monitors[i].rect.y));
        }
    }
  else
#endif /* HAVE_MONITOR_INFO */
    {
      HDC hDC;

      _gdk_num_monitors = 1;
      _gdk_monitors = g_renew (GdkWin32Monitor, _gdk_monitors, 1);

      _gdk_monitors[0].name = g_strdup ("DISPLAY");
      hDC = GetDC (NULL);
      _gdk_monitors[0].width_mm = GetDeviceCaps (hDC, HORZSIZE);
      _gdk_monitors[0].height_mm = GetDeviceCaps (hDC, VERTSIZE);
      ReleaseDC (NULL, hDC);
      _gdk_monitors[0].rect.x = 0;
      _gdk_monitors[0].rect.y = 0;
      _gdk_monitors[0].rect.width = GetSystemMetrics (SM_CXSCREEN);
      _gdk_monitors[0].rect.height = GetSystemMetrics (SM_CYSCREEN);
      _gdk_offset_x = 0;
      _gdk_offset_y = 0;
    }

}

/*
 * Dynamic version of ProcessIdToSessionId() form Terminal Service.
 * It is only returning something else than 0 when running under
 * Terminal Service, available since NT4 SP4 and not for win9x
 */
static guint
get_session_id (void)
{
  typedef BOOL (WINAPI *t_ProcessIdToSessionId) (DWORD, DWORD*);
  static t_ProcessIdToSessionId p_ProcessIdToSessionId = NULL;
  static HMODULE kernel32 = NULL;
  DWORD id = 0;

  if (kernel32 == NULL)
    {
      kernel32 = GetModuleHandle ("kernel32.dll");

      g_assert (kernel32 != NULL);

      p_ProcessIdToSessionId = (t_ProcessIdToSessionId) GetProcAddress (kernel32, "ProcessIdToSessionId");
   }
  if (p_ProcessIdToSessionId)
      p_ProcessIdToSessionId (GetCurrentProcessId (), &id); /* got it (or not ;) */

  return id;
}

GdkDisplay *
gdk_display_open (const gchar *display_name)
{
  GDK_NOTE (MISC, g_print ("gdk_display_open: %s\n", (display_name ? display_name : "NULL")));

  if (display_name == NULL ||
      g_ascii_strcasecmp (display_name,
			  gdk_display_get_name (_gdk_display)) == 0)
    {
      if (_gdk_display != NULL)
	{
	  GDK_NOTE (MISC, g_print ("... return _gdk_display\n"));
	  return _gdk_display;
	}
    }
  else
    {
      GDK_NOTE (MISC, g_print ("... return NULL\n"));
      return NULL;
    }

  _gdk_display = g_object_new (GDK_TYPE_DISPLAY, NULL);
  _gdk_screen = g_object_new (GDK_TYPE_SCREEN, NULL);

  _gdk_monitor_init ();
  _gdk_visual_init ();
  gdk_screen_set_default_colormap (_gdk_screen,
                                   gdk_screen_get_system_colormap (_gdk_screen));
  _gdk_windowing_window_init ();
  _gdk_windowing_image_init ();
  _gdk_events_init ();
  _gdk_input_init (_gdk_display);
  _gdk_dnd_init ();

  /* Precalculate display name */
  (void) gdk_display_get_name (_gdk_display);

  g_signal_emit_by_name (gdk_display_manager_get (),
			 "display_opened", _gdk_display);

  GDK_NOTE (MISC, g_print ("... _gdk_display now set up\n"));

  return _gdk_display;
}

G_CONST_RETURN gchar *
gdk_display_get_name (GdkDisplay *display)
{
  HDESK hdesk = GetThreadDesktop (GetCurrentThreadId ());
  char dummy;
  char *desktop_name;
  HWINSTA hwinsta = GetProcessWindowStation ();
  char *window_station_name;
  DWORD n;
  char *display_name;
  static const char *display_name_cache = NULL;

  g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
  
  if (display_name_cache != NULL)
    return display_name_cache;

  n = 0;
  GetUserObjectInformation (hdesk, UOI_NAME, &dummy, 0, &n);
  if (n == 0)
    desktop_name = "Default";
  else
    {
      n++;
      desktop_name = g_alloca (n + 1);
      memset (desktop_name, 0, n + 1);

      if (!GetUserObjectInformation (hdesk, UOI_NAME, desktop_name, n, &n))
	desktop_name = "Default";
    }

  n = 0;
  GetUserObjectInformation (hwinsta, UOI_NAME, &dummy, 0, &n);
  if (n == 0)
    window_station_name = "WinSta0";
  else
    {
      n++;
      window_station_name = g_alloca (n + 1);
      memset (window_station_name, 0, n + 1);

      if (!GetUserObjectInformation (hwinsta, UOI_NAME, window_station_name, n, &n))
	window_station_name = "WinSta0";
    }

  display_name = g_strdup_printf ("%d\\%s\\%s",
				  get_session_id (), window_station_name,
				  desktop_name);

  GDK_NOTE (MISC, g_print ("gdk_display_get_name: %s\n", display_name));

  display_name_cache = display_name;

  return display_name_cache;
}

gint
gdk_display_get_n_screens (GdkDisplay *display)
{
  g_return_val_if_fail (GDK_IS_DISPLAY (display), 0);
  
  return 1;
}

GdkScreen *
gdk_display_get_screen (GdkDisplay *display,
			gint        screen_num)
{
  g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
  g_return_val_if_fail (screen_num == 0, NULL);

  return _gdk_screen;
}

GdkScreen *
gdk_display_get_default_screen (GdkDisplay *display)
{
  g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);

  return _gdk_screen;
}

GdkWindow *
gdk_display_get_default_group (GdkDisplay *display)
{
  g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);

  g_warning ("gdk_display_get_default_group not yet implemented");

  return NULL;
}

gboolean 
gdk_display_supports_selection_notification (GdkDisplay *display)
{
  g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);

  return FALSE;
}

gboolean 
gdk_display_request_selection_notification (GdkDisplay *display,
                                            GdkAtom     selection)

{
  return FALSE;
}

gboolean
gdk_display_supports_clipboard_persistence (GdkDisplay *display)
{
  return FALSE;
}

void
gdk_display_store_clipboard (GdkDisplay    *display,
			     GdkWindow     *clipboard_window,
			     guint32        time_,
			     const GdkAtom *targets,
			     gint           n_targets)
{
}

gboolean 
gdk_display_supports_shapes (GdkDisplay *display)
{
  g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);

  return TRUE;
}

gboolean 
gdk_display_supports_input_shapes (GdkDisplay *display)
{
  g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);

  /* Not yet implemented. See comment in
   * gdk_window_input_shape_combine_mask().
   */

  return FALSE;
}

gboolean
gdk_display_supports_composite (GdkDisplay *display)
{
  return FALSE;
}