/* Pulsevideo
 * Copyright (C) 2015 Wim Taymans <wim.taymans@gmail.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include <gst/gst.h>
#include <gio/gio.h>

#include "pv-v4l2-source.h"

#define PV_V4L2_SOURCE_GET_PRIVATE(obj)  \
     (G_TYPE_INSTANCE_GET_PRIVATE ((obj), PV_TYPE_V4L2_SOURCE, PvV4l2SourcePrivate))

struct _PvV4l2SourcePrivate
{
  GstElement *pipeline;
  GstElement *src;
  GstElement *sink;

  GSocket *socket;
};

G_DEFINE_TYPE (PvV4l2Source, pv_v4l2_source, PV_TYPE_SOURCE);

static void
setup_pipeline (PvV4l2Source *source)
{
  PvV4l2SourcePrivate *priv = source->priv;

  priv->pipeline = gst_parse_launch ("v4l2src name=src ! "
                                         "video/x-raw,width=640,height=480,framerate=30/1 ! "
                                     "pvfdpay ! "
                                     "multisocketsink "
                                         "buffers-max=2 "
                                         "buffers-soft-max=1 "
                                         "recover-policy=latest "
                                         "sync-method=latest "
                                         "name=sink "
                                         "sync=true "
                                         "enable-last-sample=false",
                                      NULL);
  priv->sink = gst_bin_get_by_name (GST_BIN (priv->pipeline), "sink");
  priv->src = gst_bin_get_by_name (GST_BIN (priv->pipeline), "src");
}

static void
collect_capabilities (PvSource * source)
{
  PvV4l2SourcePrivate *priv = PV_V4L2_SOURCE (source)->priv;
  GstCaps *res;
  GstQuery *query;

  query = gst_query_new_caps (NULL);
  gst_element_query (priv->src, query);
  gst_query_parse_caps_result (query, &res);
  g_print ("%s\n", gst_caps_to_string (res));
  gst_query_unref (query);
}

static gboolean
v4l2_set_state (PvSource *source, PvSourceState state)
{
  PvV4l2SourcePrivate *priv = PV_V4L2_SOURCE (source)->priv;

  switch (state) {
    case PV_SOURCE_STATE_SUSPENDED:
      gst_element_set_state (priv->pipeline, GST_STATE_NULL);
      break;

    case PV_SOURCE_STATE_INIT:
      gst_element_set_state (priv->pipeline, GST_STATE_READY);
      collect_capabilities (source);
      break;

    case PV_SOURCE_STATE_IDLE:
      gst_element_set_state (priv->pipeline, GST_STATE_PAUSED);
      break;

    case PV_SOURCE_STATE_RUNNING:
      gst_element_set_state (priv->pipeline, GST_STATE_PLAYING);
      break;

    case PV_SOURCE_STATE_ERROR:
      break;
  }
  pv_source_update_state (source, state);
  return TRUE;
}

static GVariant *
v4l2_get_capabilities (PvSource *source, GVariant *props)
{
  return NULL;
}

static void
on_socket_notify (GObject    *gobject,
                  GParamSpec *pspec,
                  gpointer    user_data)
{
  PvV4l2Source *source = user_data;
  PvV4l2SourcePrivate *priv = source->priv;
  GSocket *socket;
  guint num_handles;

  g_object_get (gobject, "socket", &socket, NULL);

  if (socket == NULL) {
    if (priv->socket)
      g_signal_emit_by_name (priv->sink, "remove", priv->socket);
  } else {
    g_signal_emit_by_name (priv->sink, "add", socket);
  }
  priv->socket = socket;

  g_object_get (priv->sink, "num-handles", &num_handles, NULL);
  if (num_handles == 0) {
    gst_element_set_state (priv->pipeline, GST_STATE_READY);
  } else {
    gst_element_set_state (priv->pipeline, GST_STATE_PLAYING);
  }
}

static PvSourceOutput *
v4l2_create_source_output (PvSource *source, GVariant *props, const gchar *prefix)
{
  PvV4l2SourcePrivate *priv = PV_V4L2_SOURCE (source)->priv;
  PvSourceOutput *output;

  output = PV_SOURCE_CLASS (pv_v4l2_source_parent_class)->create_source_output (source, props, prefix);

  gst_element_set_state (priv->pipeline, GST_STATE_READY);

  g_signal_connect (output, "notify::socket", (GCallback) on_socket_notify, source);

  return output;
}

static gboolean
v4l2_release_source_output  (PvSource *source, PvSourceOutput *output)
{
  return PV_SOURCE_CLASS (pv_v4l2_source_parent_class)->release_source_output (source, output);
}

static void
v4l2_source_finalize (GObject * object)
{
  G_OBJECT_CLASS (pv_v4l2_source_parent_class)->finalize (object);
}

static void
pv_v4l2_source_class_init (PvV4l2SourceClass * klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  PvSourceClass *source_class = PV_SOURCE_CLASS (klass);

  g_type_class_add_private (klass, sizeof (PvV4l2SourcePrivate));

  gobject_class->finalize = v4l2_source_finalize;

  source_class->get_capabilities = v4l2_get_capabilities;
  source_class->set_state = v4l2_set_state;
  source_class->create_source_output = v4l2_create_source_output;
  source_class->release_source_output = v4l2_release_source_output;
}

static void
pv_v4l2_source_init (PvV4l2Source * source)
{
  source->priv = PV_V4L2_SOURCE_GET_PRIVATE (source);

  setup_pipeline (source);
}

PvSource *
pv_v4l2_source_new (void)
{
  return g_object_new (PV_TYPE_V4L2_SOURCE, "name", "v4l2", NULL);
}