/* GDK - The GIMP Drawing Kit
 * Copyright (C) 2009 Carlos Garnacho <carlosg@gnome.org>
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"
#include <stdlib.h>

#include "gdkdevice-broadway.h"

#include "gdksurfaceprivate.h"
#include "gdkprivate-broadway.h"

static gboolean gdk_broadway_device_get_history (GdkDevice      *device,
                                                 GdkSurface      *surface,
                                                 guint32         start,
                                                 guint32         stop,
                                                 GdkTimeCoord ***events,
                                                 gint           *n_events);
static void gdk_broadway_device_get_state (GdkDevice       *device,
                                           GdkSurface       *surface,
                                           gdouble         *axes,
                                           GdkModifierType *mask);
static void gdk_broadway_device_set_surface_cursor (GdkDevice *device,
                                                    GdkSurface *surface,
                                                    GdkCursor *cursor);
static void gdk_broadway_device_query_state (GdkDevice        *device,
                                             GdkSurface        *surface,
                                             GdkSurface       **child_surface,
                                             gdouble          *root_x,
                                             gdouble          *root_y,
                                             gdouble          *win_x,
                                             gdouble          *win_y,
                                             GdkModifierType  *mask);
static GdkGrabStatus gdk_broadway_device_grab   (GdkDevice     *device,
                                                 GdkSurface     *surface,
                                                 gboolean       owner_events,
                                                 GdkEventMask   event_mask,
                                                 GdkSurface     *confine_to,
                                                 GdkCursor     *cursor,
                                                 guint32        time_);
static void          gdk_broadway_device_ungrab (GdkDevice     *device,
                                                 guint32        time_);
static GdkSurface * gdk_broadway_device_surface_at_position (GdkDevice       *device,
                                                             gdouble         *win_x,
                                                             gdouble         *win_y,
                                                             GdkModifierType *mask,
                                                             gboolean         get_toplevel);


G_DEFINE_TYPE (GdkBroadwayDevice, gdk_broadway_device, GDK_TYPE_DEVICE)

static void
gdk_broadway_device_class_init (GdkBroadwayDeviceClass *klass)
{
  GdkDeviceClass *device_class = GDK_DEVICE_CLASS (klass);

  device_class->get_history = gdk_broadway_device_get_history;
  device_class->get_state = gdk_broadway_device_get_state;
  device_class->set_surface_cursor = gdk_broadway_device_set_surface_cursor;
  device_class->query_state = gdk_broadway_device_query_state;
  device_class->grab = gdk_broadway_device_grab;
  device_class->ungrab = gdk_broadway_device_ungrab;
  device_class->surface_at_position = gdk_broadway_device_surface_at_position;
}

static void
gdk_broadway_device_init (GdkBroadwayDevice *device_core)
{
  GdkDevice *device;

  device = GDK_DEVICE (device_core);

  _gdk_device_add_axis (device, NULL, GDK_AXIS_X, 0, 0, 1);
  _gdk_device_add_axis (device, NULL, GDK_AXIS_Y, 0, 0, 1);
}

static gboolean
gdk_broadway_device_get_history (GdkDevice      *device,
                                 GdkSurface      *surface,
                                 guint32         start,
                                 guint32         stop,
                                 GdkTimeCoord ***events,
                                 gint           *n_events)
{
  return FALSE;
}

static void
gdk_broadway_device_get_state (GdkDevice       *device,
                               GdkSurface       *surface,
                               gdouble         *axes,
                               GdkModifierType *mask)
{
  gdouble x, y;

  gdk_surface_get_device_position (surface, device, &x, &y, mask);

  if (axes)
    {
      axes[0] = x;
      axes[1] = y;
    }
}

static void
gdk_broadway_device_set_surface_cursor (GdkDevice *device,
                                        GdkSurface *surface,
                                        GdkCursor *cursor)
{
}

static void
gdk_broadway_device_query_state (GdkDevice        *device,
                                 GdkSurface        *surface,
                                 GdkSurface       **child_surface,
                                 gdouble          *root_x,
                                 gdouble          *root_y,
                                 gdouble          *win_x,
                                 gdouble          *win_y,
                                 GdkModifierType  *mask)
{
  GdkDisplay *display;
  GdkBroadwayDisplay *broadway_display;
  gint32 device_root_x, device_root_y;
  guint32 mouse_toplevel_id;
  guint32 mask32;

  if (gdk_device_get_source (device) != GDK_SOURCE_MOUSE)
    return;

  display = gdk_device_get_display (device);
  broadway_display = GDK_BROADWAY_DISPLAY (display);

  _gdk_broadway_server_query_mouse (broadway_display->server,
                                    &mouse_toplevel_id,
                                    &device_root_x,
                                    &device_root_y,
                                    &mask32);

  if (root_x)
    *root_x = device_root_x;
  if (root_y)
    *root_y = device_root_y;
  if (win_x)
    *win_x = device_root_x;
  if (win_y)
    *win_y = device_root_y;
  if (mask)
    *mask = mask32;
  if (child_surface)
    {
      GdkSurface *mouse_toplevel;

      mouse_toplevel = g_hash_table_lookup (broadway_display->id_ht, GUINT_TO_POINTER (mouse_toplevel_id));
      if (surface == NULL)
        *child_surface = mouse_toplevel;
      else
        *child_surface = NULL;
    }

  return;
}

void
_gdk_broadway_surface_grab_check_unmap (GdkSurface *surface,
                                        gulong     serial)
{
  GdkDisplay *display = gdk_surface_get_display (surface);
  GdkSeat *seat;
  GList *devices, *d;

  seat = gdk_display_get_default_seat (display);

  devices = gdk_seat_get_slaves (seat, GDK_SEAT_CAPABILITY_ALL);
  devices = g_list_prepend (devices, gdk_seat_get_keyboard (seat));
  devices = g_list_prepend (devices, gdk_seat_get_pointer (seat));

  /* End all grabs on the newly hidden surface */
  for (d = devices; d; d = d->next)
    _gdk_display_end_device_grab (display, d->data, serial, surface, TRUE);

  g_list_free (devices);
}


void
_gdk_broadway_surface_grab_check_destroy (GdkSurface *surface)
{
  GdkDisplay *display = gdk_surface_get_display (surface);
  GdkSeat *seat;
  GdkDeviceGrabInfo *grab;
  GList *devices, *d;

  seat = gdk_display_get_default_seat (display);

  devices = NULL;
  devices = g_list_prepend (devices, gdk_seat_get_keyboard (seat));
  devices = g_list_prepend (devices, gdk_seat_get_pointer (seat));

  for (d = devices; d; d = d->next)
    {
      /* Make sure there is no lasting grab in this native surface */
      grab = _gdk_display_get_last_device_grab (display, d->data);

      if (grab && grab->surface == surface)
        {
          grab->serial_end = grab->serial_start;
          grab->implicit_ungrab = TRUE;
        }

    }

  g_list_free (devices);
}


static GdkGrabStatus
gdk_broadway_device_grab (GdkDevice    *device,
                          GdkSurface    *surface,
                          gboolean      owner_events,
                          GdkEventMask  event_mask,
                          GdkSurface    *confine_to,
                          GdkCursor    *cursor,
                          guint32       time_)
{
  GdkDisplay *display;
  GdkBroadwayDisplay *broadway_display;

  display = gdk_device_get_display (device);
  broadway_display = GDK_BROADWAY_DISPLAY (display);

  if (gdk_device_get_source (device) == GDK_SOURCE_KEYBOARD)
    {
      /* Device is a keyboard */
      return GDK_GRAB_SUCCESS;
    }
  else
    {
      /* Device is a pointer */
      return _gdk_broadway_server_grab_pointer (broadway_display->server,
                                                GDK_BROADWAY_SURFACE (surface)->id,
                                                owner_events,
                                                event_mask,
                                                time_);
    }
}

#define TIME_IS_LATER(time1, time2)                        \
  ( (( time1 > time2 ) && ( time1 - time2 < ((guint32)-1)/2 )) ||  \
    (( time1 < time2 ) && ( time2 - time1 > ((guint32)-1)/2 ))     \
  )

static void
gdk_broadway_device_ungrab (GdkDevice *device,
                            guint32    time_)
{
  GdkDisplay *display;
  GdkBroadwayDisplay *broadway_display;
  GdkDeviceGrabInfo *grab;
  guint32 serial;

  display = gdk_device_get_display (device);
  broadway_display = GDK_BROADWAY_DISPLAY (display);

  if (gdk_device_get_source (device) == GDK_SOURCE_KEYBOARD)
    {
      /* Device is a keyboard */
    }
  else
    {
      /* Device is a pointer */
      serial = _gdk_broadway_server_ungrab_pointer (broadway_display->server, time_);

      if (serial != 0)
        {
          grab = _gdk_display_get_last_device_grab (display, device);
          if (grab &&
              (time_ == GDK_CURRENT_TIME ||
               grab->time == GDK_CURRENT_TIME ||
               !TIME_IS_LATER (grab->time, time_)))
            grab->serial_end = serial;
        }
    }
}

static GdkSurface *
gdk_broadway_device_surface_at_position (GdkDevice       *device,
                                         gdouble         *win_x,
                                         gdouble         *win_y,
                                         GdkModifierType *mask,
                                         gboolean         get_toplevel)
{
  GdkSurface *surface = NULL;

  gdk_broadway_device_query_state (device, NULL, &surface, NULL, NULL, win_x, win_y, mask);

  return surface;
}