/* vim: set sw=2: -*- Mode: C; tab-width: 2; indent-tabs-mode: t; c-basic-offset: 2; c-indent-level: 2-*- */

/**

 * GMyth Library

 *

 * @file gmyth/gmyth_monitor_handler.c

 * 

 * @brief <p> GMythMonitorHandler deals with the streaming media events remote/local

 * that are sent to the MythTV frontend.

 *

 * Copyright (C) 2006 INdT - Instituto Nokia de Tecnologia.

 * @author Rosfran Lins Borges <rosfran.borges@indt.org.br>

 *

 *//*

 * 

 * This program 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 program 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 General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 * GStreamer MythTV plug-in properties:

 * - location (backend server hostname/URL) [ex.: myth://192.168.1.73:28722/1000_1092091.nuv]

 * - path (qurl - remote file to be opened)

 * - port number *   

 */

#include "gmyth_uri.h"

#include "gmyth_livetv.h"

#include "gmyth_util.h"

#include "gmyth_socket.h"

#include "gmyth_stringlist.h"

#include "gmyth_monitor_handler.h"

#include "gmyth_debug.h"

#include <unistd.h>

#include <glib.h>

#include <arpa/inet.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netdb.h>

#include <errno.h>

#include <stdlib.h>

#include <assert.h>

#define GMYTHTV_QUERY_HEADER		"QUERY_FILETRANSFER "

#define GMYTHTV_VERSION							30

#define GMYTHTV_TRANSFER_MAX_WAITS	700

#define GMYTHTV_BUFFER_SIZE					8*1024

#ifdef GMYTHTV_ENABLE_DEBUG

#define GMYTHTV_ENABLE_DEBUG				1

#else

#undef GMYTHTV_ENABLE_DEBUG

#endif

/* this NDEBUG is to maintain compatibility with GMyth library */

#ifndef NDEBUG

#define GMYTHTV_ENABLE_DEBUG				1

#endif

GMainContext *io_watcher_context = NULL;

GThreadPool *monitor_th = NULL;

enum myth_sock_types {

  GMYTH_PLAYBACK_TYPE = 0,

  GMYTH_MONITOR_TYPE,

  GMYTH_FILETRANSFER_TYPE,

  GMYTH_RINGBUFFER_TYPE

};

//static gboolean* myth_control_sock_listener( GIOChannel *io_channel );

//static gboolean myth_control_sock_listener( GIOChannel *io_channel, GIOCondition condition, 

//				gpointer data );

static void myth_control_sock_listener( GIOChannel *io_channel, gboolean* ret );

static GMutex*				mutex 					 = NULL;

static GCond*					io_watcher_cond  = NULL;

static void gmyth_monitor_handler_class_init          (GMythMonitorHandlerClass *klass);

static void gmyth_monitor_handler_init                (GMythMonitorHandler *object);

static void gmyth_monitor_handler_dispose  (GObject *object);

static void gmyth_monitor_handler_finalize (GObject *object);

static gboolean gmyth_connect_to_backend_monitor (GMythMonitorHandler *monitor);

void gmyth_monitor_handler_close( GMythMonitorHandler *monitor );

G_DEFINE_TYPE(GMythMonitorHandler, gmyth_monitor_handler, G_TYPE_OBJECT)

static void

gmyth_monitor_handler_class_init (GMythMonitorHandlerClass *klass)

{

  GObjectClass *gobject_class;

  gobject_class = (GObjectClass *) klass;

  gobject_class->dispose  = gmyth_monitor_handler_dispose;

  gobject_class->finalize = gmyth_monitor_handler_finalize;

}

static void

gmyth_monitor_handler_init (GMythMonitorHandler *monitor)

{ 

  g_return_if_fail( monitor != NULL );

  monitor->event_sock = NULL;

  monitor->hostname = NULL;

  monitor->port = 0;

  monitor->actual_index = 0;

  monitor->backend_msgs = g_hash_table_new( g_int_hash, g_int_equal );

  /* it is used for signalizing the event socket consumer thread */

  io_watcher_cond = g_cond_new();

  /* mutex to control access to the event socket consumer thread */

  mutex = g_mutex_new();

}

static void

gmyth_monitor_handler_dispose  (GObject *object)

{

	GMythMonitorHandler *monitor = GMYTH_MONITOR_HANDLER (object);

  if ( monitor->event_sock != NULL )  

  {

  	g_object_unref( monitor->event_sock );

  	monitor->event_sock = NULL;

  }

  if ( monitor->hostname != NULL )  

  {

  	g_free( monitor->hostname );

  	monitor->hostname = NULL;

  }

  if ( monitor->backend_msgs != NULL )  

  {

  	g_hash_table_unref( monitor->backend_msgs );

  	monitor->backend_msgs = NULL;

  }

  if ( mutex != NULL )  

  {

  	g_mutex_free( mutex );

  	mutex = NULL;

  }

  if ( io_watcher_cond != NULL )  

  {

  	g_cond_free( io_watcher_cond );

  	io_watcher_cond = NULL;

  }

  if ( monitor_th != NULL )  

  {

  	g_thread_pool_free( monitor_th, TRUE, FALSE );

  	//g_object_unref( monitor_th );

  	monitor_th = NULL;

  }

  G_OBJECT_CLASS (gmyth_monitor_handler_parent_class)->dispose (object);

}

static void

gmyth_monitor_handler_finalize (GObject *object)

{

  g_signal_handlers_destroy (object);

  G_OBJECT_CLASS (gmyth_monitor_handler_parent_class)->finalize (object);

}

// fixme: do we need the card_id????

GMythMonitorHandler*

gmyth_monitor_handler_new (void)

{

  GMythMonitorHandler *monitor = GMYTH_MONITOR_HANDLER ( g_object_new (

				GMYTH_MONITOR_HANDLER_TYPE, FALSE ));

  return monitor;

}

gboolean

gmyth_monitor_handler_open (GMythMonitorHandler *monitor, gchar *hostname, gint port)

{

  gboolean ret = TRUE;

  if (monitor->hostname != NULL) {

    g_free (monitor->hostname);

    monitor->hostname = NULL;

  }

  monitor->hostname = g_strdup( hostname );

  monitor->port = port;

  gmyth_debug ("Monitor event socket --- hostname: %s, port %d\n", monitor->hostname, monitor->port);

  /* configure the event socket */

  if (monitor->event_sock == NULL) { 

    if (!gmyth_connect_to_backend_monitor (monitor)) {

      g_printerr( "Connection to backend failed (Event Socket).\n" );

      ret = FALSE;

    }

  } else {

    g_warning("Remote monitor event socket already created.\n");

  }

  return ret;

}

static void

//myth_control_sock_listener( GIOChannel *io_channel, GIOCondition condition, gpointer data )

myth_control_sock_listener( GIOChannel *io_channel, gboolean* ret )

{

  GIOStatus io_status;

  GError *error = NULL;

  GIOCondition io_cond;

  GIOCondition condition;

  gchar *trash = NULL;

  GByteArray *byte_array = NULL;

  guint recv = 0;

  ret = g_new0( gboolean, 1 );

  *ret = TRUE;

  //gboolean ret = TRUE;

  gsize len = 0;

  static guint count = 0;  

  //GMythMonitorHandler *monitor = (GMythMonitorHandler*)data;

  //myth_control_acquire_context (TRUE);

  if ( io_channel == NULL ) {

  	g_debug ("Monitor socket is NULL!\n");

  	*ret = FALSE;

  	goto clean_up;

  }

  while (TRUE) {

  	++count;

  	gmyth_debug ("%d - Listening on Monitor socket...!\n", count);

	  condition = g_io_channel_get_buffer_condition( io_channel );	  

	  //while ( !has_io_access ) 

	  //	g_cond_wait( io_watcher_cond, mutex );

	  //myth_control_acquire_context (TRUE);  

	  if (condition & G_IO_HUP) {

	    gmyth_debug ("Read end of pipe died!\n");

	    ret = FALSE;

	    //goto clean_up;

	  }

	  //if ( ( condition & G_IO_IN ) != 0 ) {

	  	byte_array = g_byte_array_new();

	  	io_status = g_io_channel_set_encoding( io_channel, NULL, &error );

	  	guint buffer_size = GMYTHTV_BUFFER_SIZE;

	    do 

	    {

	      trash = g_new0( gchar, buffer_size );

	      io_status = g_io_channel_read_chars( io_channel, trash, 

	      		buffer_size, &len, &error);

	      gmyth_debug ( "[%s] Received data buffer from IO binary channel... %d bytes gone!\n", 

	      		__FUNCTION__, len );

	      recv += len;

	      byte_array = g_byte_array_append( byte_array, (const guint8*)trash, len );

	      if ( trash != NULL )

	      	g_free( trash );

	      io_cond = g_io_channel_get_buffer_condition( io_channel );

	    } while ( ( io_cond & G_IO_IN ) != 0 );

	    gmyth_debug ("\n\n\n[%s]\tEVENT: Read %d bytes: %s\n\n\n", __FUNCTION__, recv, byte_array != NULL && byte_array->data != NULL ? (gchar*)byte_array->data : "[no event data]" );

	  //}	  

	  if ( byte_array != NULL ) {

	  	g_byte_array_free( byte_array, TRUE );

	  	byte_array = NULL;

	  }

	  g_usleep( 300 );

  }

  if ( io_status == G_IO_STATUS_ERROR || error != NULL ) {

    gmyth_debug ("[%s] Error reading: %s\n", __FUNCTION__, error != NULL ? error->message : "" );

   	*ret = FALSE;

   	goto clean_up;   	

  }

  //g_hash_table_insert( monitor->backend_msgs, (gpointer)monitor->actual_index,

  //				  byte_array->data );

  //monitor->actual_index += recv;

clean_up:

  if ( byte_array != NULL ) {

  	g_byte_array_free( byte_array, TRUE );

  	byte_array = NULL;

  }

  //return ret;

}

static gboolean

gmyth_connect_to_backend_monitor (GMythMonitorHandler *monitor)

{

  gboolean ret = TRUE;

  /* Creates the event socket */

  if (monitor->event_sock != NULL) {

    g_object_unref (monitor->event_sock);

    monitor->event_sock = NULL;

  }

  monitor->event_sock = gmyth_socket_new();

  /* Connects the socket, send Mythtv ANN Monitor and verify Mythtv protocol version */ 

  if (!gmyth_socket_connect_to_backend_events ( monitor->event_sock,

          monitor->hostname, monitor->port, FALSE ) ) 

  {

    g_object_unref (monitor->event_sock);

    monitor->event_sock = NULL;

    ret = FALSE;

  }

  return ret;

}    

static gboolean*

myth_control_sock_setup( GIOChannel *channel )

{

	gboolean *ret = g_new0( gboolean, 1 );

	//guint src_id = 0;

	*ret = TRUE;

  io_watcher_context = g_main_context_default();

  GMainLoop *loop = g_main_loop_new( io_watcher_context, TRUE );

  GSource *source;

  if ( channel != NULL ) {

    source = g_io_create_watch( channel, G_IO_IN | G_IO_HUP );

    //src_id = g_io_add_watch( channel, G_IO_IN | G_IO_HUP, 

    //					(GSourceFunc)myth_control_sock_listener, NULL );

  } else {

  	*ret = FALSE;

  	goto cleanup;

  }

  g_source_set_callback ( source, (GSourceFunc)myth_control_sock_listener, NULL, NULL );

  g_source_attach( source, io_watcher_context );

  if (NULL == source){

    gmyth_debug( "[%s] Error adding watch listener function to the IO control channel!\n", __FUNCTION__ );

    *ret = FALSE;

    goto cleanup;

  }

  g_main_loop_run( loop );

cleanup:

  if ( source != NULL )

    g_source_unref( source );

  //if ( io_watcher_context != NULL )

  //  g_main_context_unref( io_watcher_context );

  //if ( loop != NULL )

  //  g_main_loop_unref( loop );

  return ret;

}

gboolean 

gmyth_monitor_handler_start (GMythMonitorHandler *monitor)

{

	gboolean *ret = g_new0( gboolean, 1 ); 

	*ret = TRUE;	

	if (!g_thread_supported () ) 	g_thread_init (NULL);

  monitor_th = g_thread_pool_new( (GFunc)myth_control_sock_listener, 

  					monitor->event_sock->sd_io_ch, 3, FALSE, NULL );

  //if ( ( ret = g_thread_join( monitor_th ) ) == FALSE )

  if ( monitor_th != NULL )

  {

  	gmyth_debug ( "\n[%s]\tOK! Starting listener on the MONITOR event socket...[thread location = %p]\n", 

  				__FUNCTION__, g_thread_self( ) );

  	*ret = TRUE;  	  	

  } else {

  	gmyth_debug ( "\n[%s]\tERROR! Coudn't start listener on the MONITOR event socket...[thread location = %p]\n", 

  				__FUNCTION__, g_thread_self( ) );

  	*ret = FALSE;

  }

//cleanup:

  gmyth_debug( "[%s] Watch listener function over the IO control channel? %s!!!\n", 

  			__FUNCTION__, ( *ret == TRUE ? "YES" : "NO" ) );

    return *ret;

}

void

gmyth_monitor_handler_close( GMythMonitorHandler *monitor )

{

  if (monitor->event_sock) {

    g_object_unref( monitor->event_sock );

    monitor->event_sock = NULL;

  }

  if (monitor->hostname) {

    g_free( monitor->hostname );

    monitor->hostname = NULL;

  }

}