/* GDK - The GIMP Drawing Kit
 * Copyright (C) 2002 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 "gdk.h"
#include "gdkprivate-win32.h"

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;

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

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;

  gint *index = (gint *) data;
  GdkRectangle *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

  if (monitor_info.dwFlags & MONITORINFOF_PRIMARY)
    {
      /* For the primary monitor, use SPI_GETWORKAREA */
      RECT rect;

      SystemParametersInfo (SPI_GETWORKAREA, 0, &rect, 0);
      monitor->x = rect.left;
      monitor->y = rect.top;
      monitor->width = rect.right - rect.left;
      monitor->height = rect.bottom - rect.top;

      /* Put primary monitor at index 0, just in case somebody needs
       * to know which one is the primary.
       */
      if (*index != 0)
	{
	  GdkRectangle temp = *monitor;
	  *monitor = _gdk_monitors[0];
	  _gdk_monitors[0] = temp;
	}
    }
  else
    {
      monitor->x = monitor_info.rcMonitor.left;
      monitor->y = monitor_info.rcMonitor.top;
      monitor->width = monitor_info.rcMonitor.right - monitor_info.rcMonitor.left;
      monitor->height = monitor_info.rcMonitor.bottom - monitor_info.rcMonitor.top;
    }

  (*index)++;

  return TRUE;
}

GdkDisplay *
gdk_display_open (const gchar *display_name)
{
  HMODULE user32;

  if (_gdk_display != NULL)
    return NULL; /* single display only */

  _gdk_display = g_object_new (GDK_TYPE_DISPLAY, NULL);
  _gdk_screen = g_object_new (GDK_TYPE_SCREEN, 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_new (GdkRectangle, _gdk_num_monitors);
      index = 0;
      (*p_EnumDisplayMonitors) (NULL, NULL, enum_monitor, (LPARAM) &index);
#if 1
      _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].x);
	  _gdk_offset_y = MAX (_gdk_offset_y, -_gdk_monitors[i].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].x += _gdk_offset_x;
	  _gdk_monitors[i].y += _gdk_offset_y;
	  GDK_NOTE (MISC, g_print ("Monitor %d: %dx%d@+%d+%d\n",
				   i, _gdk_monitors[i].width,
				   _gdk_monitors[i].height,
				   _gdk_monitors[i].x, _gdk_monitors[i].y));
	}
#endif
    }
  else
    {
      RECT rect;

      _gdk_num_monitors = 1;
      _gdk_monitors = g_new (GdkRectangle, 1);
      SystemParametersInfo (SPI_GETWORKAREA, 0, &rect, 0);
      _gdk_monitors[0].x = rect.left;
      _gdk_monitors[0].y = rect.top;
      _gdk_monitors[0].width = rect.right - rect.left;
      _gdk_monitors[0].height = rect.bottom - rect.top;
      _gdk_offset_x = 0;
      _gdk_offset_y = 0;
    }

  _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 ();

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

  return _gdk_display;
}

G_CONST_RETURN gchar *
gdk_display_get_name (GdkDisplay *display)
{
  return gdk_get_display_arg_name ();
}

gint
gdk_display_get_n_screens (GdkDisplay *display)
{
  return 1;
}

GdkScreen *
gdk_display_get_screen (GdkDisplay *display,
			gint        screen_num)
{
  return _gdk_screen;
}

GdkScreen *
gdk_display_get_default_screen (GdkDisplay *display)
{
  return _gdk_screen;
}

