#include <X11/Xlib.h>
#include <X11/extensions/Xcomposite.h>
#include <clutter/clutter.h>
#include <clutter/x11/clutter-x11.h>
#include <clutter/glx/clutter-glx.h>
#include <gst/gst.h>
#include <gst/interfaces/xoverlay.h>

#define W 320
#define H 240

struct GstGLClutterActor_ {
  Window win;
  Window root;
  ClutterActor *texture;
  ClutterActor *stage;
};

typedef struct GstGLClutterActor_ GstGLClutterActor;

static gboolean
create_actor (GstGLClutterActor *actor) {
  ClutterKnot knot[2];
  ClutterTimeline *timeline;
  ClutterEffectTemplate *effect_template;

  actor->texture = g_object_new (CLUTTER_GLX_TYPE_TEXTURE_PIXMAP, 
			     "window", actor->win,
			     "automatic-updates", TRUE, NULL);
  clutter_container_add_actor (CLUTTER_CONTAINER (actor->stage), actor->texture);
  clutter_actor_set_scale (actor->texture, 0.2 , 0.2);
  clutter_actor_set_opacity (actor->texture, 0);
  clutter_actor_show (actor->texture);  

  timeline = clutter_timeline_new(120 /* frames */, 50 /* frames per second. */);
  clutter_timeline_set_loop(timeline, TRUE); 
  clutter_timeline_start(timeline);
  
  /* Instead of our custom callback, 
   * we could use a standard callback. For instance, CLUTTER_ALPHA_SINE_INC. 
   */
  effect_template = 
    clutter_effect_template_new (timeline, CLUTTER_ALPHA_SINE_INC);
  
  knot[0].x = -10;
  knot[0].y = -10;
  knot[1].x= 160;
  knot[1].y= 120;
 
  // Move the actor along the path:
  clutter_effect_path (effect_template, actor->texture, knot, 
		       sizeof(knot) / sizeof(ClutterKnot), NULL, NULL);
  clutter_effect_scale (effect_template, actor->texture, 1.0, 1.0, NULL, NULL);
  clutter_effect_rotate (effect_template, actor->texture, 
			 CLUTTER_Z_AXIS, 360.0, W/2.0, H/2.0, 0.0, 
			 CLUTTER_ROTATE_CW, NULL, NULL);
  clutter_effect_rotate (effect_template, actor->texture, 
			 CLUTTER_X_AXIS, 360.0, 0.0, W/4.0, 0.0, 
			 CLUTTER_ROTATE_CW, NULL, NULL); 

  // Also change the actor's opacity while moving it along the path:
  // (You would probably want to use a different ClutterEffectTemplate, 
  // so you could use a different alpha callback for this.)
  clutter_effect_fade (effect_template, actor->texture, 255, NULL, NULL);

  g_object_unref (effect_template);
  g_object_unref (timeline);

   return FALSE;
}

static GstBusSyncReply
create_window (GstBus * bus, GstMessage * message, gpointer data)
{
  GstGLClutterActor *actor = (GstGLClutterActor *) data;
  // ignore anything but 'prepare-xwindow-id' element messages
  if (GST_MESSAGE_TYPE (message) != GST_MESSAGE_ELEMENT)
    return GST_BUS_PASS;
  
  if (!gst_structure_has_name (message->structure, "prepare-xwindow-id"))
    return GST_BUS_PASS;
  
  g_debug ("CREATING WINDOW");
  
  gst_x_overlay_set_xwindow_id (GST_X_OVERLAY (GST_MESSAGE_SRC (message)), actor->win); 
  clutter_threads_add_idle ((GSourceFunc) create_actor, actor);
  
  gst_message_unref (message);
  return GST_BUS_DROP;
}

int
main (int argc, char *argv[])
{
  GstPipeline      *pipeline;
  GstBus	   *bus;
  ClutterActor *stage;
  GstGLClutterActor *actor;
  Display *disp;
  Window stage_win;

  clutter_init (&argc, &argv);
  gst_init (&argc, &argv);

  disp = clutter_x11_get_default_display ();
  if(!clutter_x11_has_composite_extension ()) {
    g_error ("XComposite extension missing");
  }
  

  stage = clutter_stage_get_default ();
//  clutter_actor_set_size (CLUTTER_ACTOR (stage), W*3+2, H);

  stage_win = clutter_x11_get_stage_window (CLUTTER_STAGE (stage));

  actor = g_new0 (GstGLClutterActor, 1);
  actor->stage = stage;
  actor->win = XCreateSimpleWindow (disp, stage_win, 0, 0, W, H, 0, 0, 0);
  XCompositeRedirectWindow (disp, actor->win, CompositeRedirectManual);
  XMapRaised (disp, actor->win);
  XSync (disp, FALSE);

  pipeline = GST_PIPELINE (gst_parse_launch ("videotestsrc ! video/x-raw-rgb, width=320, height=240, framerate=(fraction)30/1 ! "
                                             "glupload ! gleffects effect=twirl ! glimagesink", NULL));

  bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));

  gst_bus_set_sync_handler (bus, (GstBusSyncHandler) create_window, actor);

  gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_PLAYING);

  clutter_actor_show_all (stage);

  clutter_main();

  gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_NULL);
  g_object_unref (pipeline);
  
  return 0;
}