/* GStreamer
 * Copyright (C) <2005> Philippe Khalaf <burger@speedy.org>
 * Copyright (C) <2005> Nokia Corporation <kai.vehmanen@nokia.com>
 * Copyright (C) <2006> Joni Valtanen <joni.valtanen@movial.fi>
 *
 * 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstudp-marshal.h"
#include "gstdynudpsink.h"

#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <errno.h>
#include <string.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <sys/types.h>
#include <gst/netbuffer/gstnetbuffer.h>

GST_DEBUG_CATEGORY_STATIC (dynudpsink_debug);
#define GST_CAT_DEFAULT (dynudpsink_debug)

static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS_ANY);

/* DynUDPSink signals and args */
enum
{
  /* methods */
  SIGNAL_GET_STATS,

  /* signals */

  /* FILL ME */
  LAST_SIGNAL
};

#define UDP_DEFAULT_SOCKFD		-1
#define UDP_DEFAULT_CLOSEFD		TRUE

enum
{
  PROP_0,
  PROP_SOCKFD,
  PROP_CLOSEFD
};

#define CLOSE_IF_REQUESTED(udpctx)                                        \
G_STMT_START {                                                            \
  if ((!udpctx->externalfd) || (udpctx->externalfd && udpctx->closefd)) { \
    CLOSE_SOCKET(udpctx->sock);                                           \
    if (udpctx->sock == udpctx->sockfd)                                   \
      udpctx->sockfd = UDP_DEFAULT_SOCKFD;                                \
  }                                                                       \
  udpctx->sock = -1;                                                      \
} G_STMT_END

static void gst_dynudpsink_finalize (GObject * object);

static GstFlowReturn gst_dynudpsink_render (GstBaseSink * sink,
    GstBuffer * buffer);
static void gst_dynudpsink_close (GstDynUDPSink * sink);
static GstStateChangeReturn gst_dynudpsink_change_state (GstElement * element,
    GstStateChange transition);

static void gst_dynudpsink_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec);
static void gst_dynudpsink_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec);

static guint gst_dynudpsink_signals[LAST_SIGNAL] = { 0 };

#define gst_dynudpsink_parent_class parent_class
G_DEFINE_TYPE (GstDynUDPSink, gst_dynudpsink, GST_TYPE_BASE_SINK);

static void
gst_dynudpsink_class_init (GstDynUDPSinkClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;
  GstBaseSinkClass *gstbasesink_class;

  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;
  gstbasesink_class = (GstBaseSinkClass *) klass;

  parent_class = g_type_class_peek_parent (klass);

  gobject_class->set_property = gst_dynudpsink_set_property;
  gobject_class->get_property = gst_dynudpsink_get_property;
  gobject_class->finalize = gst_dynudpsink_finalize;

  gst_dynudpsink_signals[SIGNAL_GET_STATS] =
      g_signal_new ("get-stats", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
      G_STRUCT_OFFSET (GstDynUDPSinkClass, get_stats),
      NULL, NULL, gst_udp_marshal_BOXED__STRING_INT, G_TYPE_VALUE_ARRAY, 2,
      G_TYPE_STRING, G_TYPE_INT);

  g_object_class_install_property (gobject_class, PROP_SOCKFD,
      g_param_spec_int ("sockfd", "socket handle",
          "Socket to use for UDP sending. (-1 == allocate)",
          -1, G_MAXINT16, UDP_DEFAULT_SOCKFD,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_CLOSEFD,
      g_param_spec_boolean ("closefd", "Close sockfd",
          "Close sockfd if passed as property on state change",
          UDP_DEFAULT_CLOSEFD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  gstelement_class->change_state = gst_dynudpsink_change_state;

  gst_element_class_add_pad_template (gstelement_class,
      gst_static_pad_template_get (&sink_template));

  gst_element_class_set_details_simple (gstelement_class, "UDP packet sender",
      "Sink/Network",
      "Send data over the network via UDP",
      "Philippe Khalaf <burger@speedy.org>");

  gstbasesink_class->render = gst_dynudpsink_render;

  GST_DEBUG_CATEGORY_INIT (dynudpsink_debug, "dynudpsink", 0, "UDP sink");
}

static void
gst_dynudpsink_init (GstDynUDPSink * sink)
{
  WSA_STARTUP (sink);

  sink->sockfd = UDP_DEFAULT_SOCKFD;
  sink->closefd = UDP_DEFAULT_CLOSEFD;
  sink->externalfd = FALSE;

  sink->sock = -1;
}

static void
gst_dynudpsink_finalize (GObject * object)
{
  GstDynUDPSink *udpsink;

  udpsink = GST_DYNUDPSINK (object);

  if (udpsink->sockfd >= 0 && udpsink->closefd)
    CLOSE_SOCKET (udpsink->sockfd);

  G_OBJECT_CLASS (parent_class)->finalize (object);

  WSA_CLEANUP (object);
}

static GstFlowReturn
gst_dynudpsink_render (GstBaseSink * bsink, GstBuffer * buffer)
{
  GstDynUDPSink *sink;
  gint ret;
  gsize size;
  guint8 *data;
  GstMetaNetAddress *meta;
  struct sockaddr_in theiraddr;
  guint16 destport;
  guint32 destaddr;

  memset (&theiraddr, 0, sizeof (theiraddr));

  meta = gst_buffer_get_meta_net_address (buffer);

  if (meta == NULL) {
    GST_DEBUG ("Received buffer is not a GstNetBuffer, skipping");
    return GST_FLOW_OK;
  }

  sink = GST_DYNUDPSINK (bsink);

  data = gst_buffer_map (buffer, &size, NULL, GST_MAP_READ);

  GST_DEBUG ("about to send %d bytes", size);

  /* let's get the address from the metaata */
  gst_netaddress_get_ip4_address (&meta->naddr, &destaddr, &destport);

  GST_DEBUG ("sending %d bytes to client %d port %d", size, destaddr, destport);

  theiraddr.sin_family = AF_INET;
  theiraddr.sin_addr.s_addr = destaddr;
  theiraddr.sin_port = destport;
#ifdef G_OS_WIN32
  ret = sendto (sink->sock, (char *) data, size, 0,
#else
  ret = sendto (sink->sock, data, size, 0,
#endif
      (struct sockaddr *) &theiraddr, sizeof (theiraddr));

  gst_buffer_unmap (buffer, data, size);

  if (ret < 0) {
    if (errno != EINTR && errno != EAGAIN) {
      goto send_error;
    }
  }

  GST_DEBUG ("sent %d bytes", size);

  return GST_FLOW_OK;

send_error:
  {
    GST_DEBUG ("got send error %s (%d)", g_strerror (errno), errno);
    return GST_FLOW_ERROR;
  }
}

static void
gst_dynudpsink_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec)
{
  GstDynUDPSink *udpsink;

  udpsink = GST_DYNUDPSINK (object);

  switch (prop_id) {
    case PROP_SOCKFD:
      if (udpsink->sockfd >= 0 && udpsink->sockfd != udpsink->sock &&
          udpsink->closefd)
        CLOSE_SOCKET (udpsink->sockfd);
      udpsink->sockfd = g_value_get_int (value);
      GST_DEBUG ("setting SOCKFD to %d", udpsink->sockfd);
      break;
    case PROP_CLOSEFD:
      udpsink->closefd = g_value_get_boolean (value);
      break;

    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static void
gst_dynudpsink_get_property (GObject * object, guint prop_id, GValue * value,
    GParamSpec * pspec)
{
  GstDynUDPSink *udpsink;

  udpsink = GST_DYNUDPSINK (object);

  switch (prop_id) {
    case PROP_SOCKFD:
      g_value_set_int (value, udpsink->sockfd);
      break;
    case PROP_CLOSEFD:
      g_value_set_boolean (value, udpsink->closefd);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}


/* create a socket for sending to remote machine */
static gboolean
gst_dynudpsink_init_send (GstDynUDPSink * sink)
{
  guint bc_val;

  if (sink->sockfd == -1) {
    /* create sender socket if none available */
    if ((sink->sock = socket (AF_INET, SOCK_DGRAM, 0)) < 0)
      goto no_socket;

    bc_val = 1;
    if (setsockopt (sink->sock, SOL_SOCKET, SO_BROADCAST, &bc_val,
            sizeof (bc_val)) < 0)
      goto no_broadcast;

    sink->externalfd = TRUE;
  } else {
    sink->sock = sink->sockfd;
    sink->externalfd = TRUE;
  }
  return TRUE;

  /* ERRORS */
no_socket:
  {
    perror ("socket");
    return FALSE;
  }
no_broadcast:
  {
    perror ("setsockopt");
    CLOSE_IF_REQUESTED (sink);
    return FALSE;
  }
}

GValueArray *
gst_dynudpsink_get_stats (GstDynUDPSink * sink, const gchar * host, gint port)
{
  return NULL;
}

static void
gst_dynudpsink_close (GstDynUDPSink * sink)
{
  CLOSE_IF_REQUESTED (sink);
}

static GstStateChangeReturn
gst_dynudpsink_change_state (GstElement * element, GstStateChange transition)
{
  GstStateChangeReturn ret;
  GstDynUDPSink *sink;

  sink = GST_DYNUDPSINK (element);

  switch (transition) {
    case GST_STATE_CHANGE_READY_TO_PAUSED:
      if (!gst_dynudpsink_init_send (sink))
        goto no_init;
      break;
    default:
      break;
  }

  ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);

  switch (transition) {
    case GST_STATE_CHANGE_PAUSED_TO_READY:
      gst_dynudpsink_close (sink);
      break;
    default:
      break;
  }
  return ret;

  /* ERRORS */
no_init:
  {
    return GST_STATE_CHANGE_FAILURE;
  }
}