/**

 * 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 *   

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#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>

#include "gmyth_marshal.h"

#include "gmyth_monitor_handler.h"

#include "gmyth.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;

//GThread *monitor_th = NULL;

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

//static gboolean gmyth_monitor_handler_listener( GIOChannel *io_channel, 

//						GIOCondition condition, gpointer data );

//gboolean* gmyth_monitor_handler_listener( GMythMonitorHandler *monitor );

void gmyth_monitor_handler_listener( GMythMonitorHandler *monitor, gpointer user_data );

static void gmyth_monitor_handler_default_listener( GMythMonitorHandler *monitor, gint msg_code, gchar* message );

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;

  GMythMonitorHandlerClass *gmonitor_class;

  gobject_class = (GObjectClass *) klass;

  gmonitor_class = (GMythMonitorHandlerClass *) gobject_class;

  gobject_class->dispose  = gmyth_monitor_handler_dispose;

  gobject_class->finalize = gmyth_monitor_handler_finalize;

	gmonitor_class->backend_events_handler_signal_id = 

		  g_signal_new ("backend-events-handler",

		                 G_TYPE_FROM_CLASS (gmonitor_class),

		                 G_SIGNAL_RUN_LAST | G_SIGNAL_NO_RECURSE | G_SIGNAL_NO_HOOKS,

		                 0,

										 NULL,

										 NULL,

										 gmyth_marshal_VOID__INT_STRING,

										 G_TYPE_NONE,

										 2,

										 G_TYPE_INT,

										 G_TYPE_STRING);

	gmonitor_class->backend_events_handler = gmyth_monitor_handler_default_listener;

}

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();

  monitor->monitor_th = NULL;

  monitor->gmyth_monitor_handler_listener = gmyth_monitor_handler_listener;

}

static void

gmyth_monitor_handler_dispose  (GObject *object)

{

	GMythMonitorHandler *monitor = GMYTH_MONITOR_HANDLER (object);

	if ( monitor->monitor_th != NULL )  

  {

  	g_thread_pool_free( monitor->monitor_th, TRUE, FALSE );

  	/*

  	g_thread_exit( monitor->monitor_th );

  	if ( monitor->monitor_th != NULL )

  		g_object_unref( monitor->monitor_th );

  	*/

  	monitor->monitor_th = NULL;

  }

  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_destroy ( 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;

  }

  */

  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;

}

static gboolean 

myth_control_acquire_context( gboolean do_wait ) 

{

	gboolean ret = TRUE;	

	//guint max_iter = 50;

	//g_mutex_lock( mutex );

  //while ( !has_io_access ) 

  //	g_cond_wait( io_watcher_cond, mutex );

  //has_io_access = FALSE;

  /*

  if ( do_wait ) {

  	while ( --max_iter > 0 && !g_main_context_wait( io_watcher_context, io_watcher_cond, mutex ) )

  		ret = FALSE;

  } else if ( !g_main_context_acquire( io_watcher_context ) )

  	ret = FALSE;

  */

  //g_static_mutex_lock( &st_mutex );

  return ret;

}

static gboolean 

myth_control_release_context( ) 

{

	gboolean ret = TRUE;

  //g_static_mutex_unlock( &st_mutex );

	//g_main_context_release( io_watcher_context );

  //g_main_context_wakeup( io_watcher_context );

  //has_io_access = TRUE;

  //g_cond_broadcast( io_watcher_cond );

  //g_mutex_unlock( mutex );  

  return ret;

}

gboolean

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

{

  gboolean ret = TRUE;

  g_return_val_if_fail( hostname != NULL, FALSE );

  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 ( NULL == monitor->event_sock ) { 

    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 gint

gmyth_monitor_handler_is_backend_message( GMythMonitorHandler *monitor,

                        GMythStringList* strlist, gchar **back_msg_action )

{

	gint msg_type = GMYTH_BACKEND_NO_MESSAGE;

	GString *back_msg = NULL;

	back_msg = gmyth_string_list_get_string( strlist, 0 );

	if ( back_msg != NULL && back_msg->str != NULL &&

	                                strstr( back_msg->str, "BACKEND" ) != NULL )

	{

	  if ( monitor->backend_msgs != NULL )

	  {

	  	*back_msg_action = gmyth_string_list_get_char_array( strlist, 1 );	        	

	  	if ( back_msg_action != NULL )

	  	{	        	

	    	if ( g_strstr_len( *back_msg_action, strlen( *back_msg_action ), "LIVETV_CHAIN" ) ||

	    			g_strstr_len( *back_msg_action, strlen( *back_msg_action ), "RECORDING_LIST_CHANGE" ) ||

	    			g_strstr_len( *back_msg_action, strlen( *back_msg_action ), "LIVETV_WATCH" ) )

	    	{

	    		gmyth_debug( "MONITOR: message type == GMYTH_BACKEND_PROGRAM_INFO_CHANGED, msg = %s", *back_msg_action );

	    		msg_type = GMYTH_BACKEND_PROGRAM_INFO_CHANGED;

	    	}  	

	      //g_hash_table_insert ( monitor->backend_msgs,

	      //                       &(monitor->actual_index), *back_msg_action );

	  	} // if

	  } // if

	}

	if ( back_msg != NULL )

	{

		g_string_free( back_msg, TRUE );

		back_msg = NULL;        	

	}

	return msg_type;

}

static void

gmyth_monitor_handler_default_listener( GMythMonitorHandler *monitor, gint msg_code, gchar* message )

{

	//assert( message!= NULL );  

	gmyth_debug( "DEFAULT Signal handler ( msg = %s, code = %d )\n", 

				message, msg_code );

}

static void

gmyth_monitor_handler_print( GString *str, gpointer ptr )

{

	gmyth_debug( "Backend message event: %s --- ", str->str );

}

//static void

//gmyth_monitor_handler_listener (GMythMonitorHandler *monitor, gpointer user_data)

//static gboolean

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

//gboolean* gmyth_monitor_handler_listener( GMythMonitorHandler *monitor )

void

gmyth_monitor_handler_listener (GMythMonitorHandler *monitor, gpointer user_data)

{

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

  GIOStatus io_status;

  GIOCondition io_cond;  

  guint recv = 0;

  gboolean *ret = g_new0( gboolean, 1 );

  *ret = TRUE;

  //gboolean ret = TRUE;

  gsize len = 0;

  static guint count = 0;

  GIOChannel *io_channel = monitor->event_sock->sd_io_ch;

  //GIOCondition condition = g_io_channel_get_buffer_condition( io_channel );

  GMythStringList *strlist = NULL;

  //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);

    do 

    {

    	gint bytes_sent = 0;

    	strlist = gmyth_string_list_new();

    	if ( monitor->event_sock != NULL )

    	{

	      len = gmyth_socket_read_stringlist( monitor->event_sock, strlist );

		    if ( strlist != NULL && gmyth_string_list_length( strlist ) > 0 ) 

		    { 

			    bytes_sent = gmyth_string_list_get_int( strlist,  0 ); // -1 on backend error

		      gmyth_debug ( "[%s] MONITOR: received data buffer from IO event channel... %d strings gone!\n", 

		      		__FUNCTION__, len );

		      recv += len;

		      /* debug purpose: prints out all the string list elements */

		      g_list_foreach( strlist->glist, (GFunc)gmyth_monitor_handler_print, NULL );

		      gchar *back_msg_action = g_new0( gchar, 1 );

		      gint msg_type = gmyth_monitor_handler_is_backend_message( monitor, strlist, 

		      		&back_msg_action );

	        g_signal_emit ( monitor,

	               GMYTH_MONITOR_HANDLER_GET_CLASS (monitor)->backend_events_handler_signal_id,

	               0, /* details */

	               msg_type, back_msg_action );

	        if (back_msg_action!= NULL)

	        	g_free( back_msg_action );

		    }

    	}

	    if (strlist!=NULL)

	    	g_object_unref( strlist );

      io_cond = g_io_channel_get_buffer_condition( io_channel );

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

    gmyth_debug ("[%s]\tMONITOR EVENT: Read %d bytes\n", __FUNCTION__, recv );

	  g_usleep( 300 );

  } /* main GThread while */

  myth_control_release_context ();

  if ( io_status == G_IO_STATUS_ERROR ) {

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

    gmyth_debug ("Error reading MONITOR event socket.\n");

   	*ret = FALSE;

   	goto clean_up;   	

  }

clean_up:

  if (strlist!=NULL)

  	g_object_unref( strlist );

 	return;

}

static gboolean

gmyth_connect_to_backend_monitor (GMythMonitorHandler *monitor)

{

  gboolean ret = TRUE;

  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*

gmyth_monitor_handler_setup( GMythMonitorHandler *monitor, 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, 

    					(GIOFunc)gmyth_monitor_handler_listener, monitor );

  } else {

  	*ret = FALSE;

  	goto cleanup;

  }

  //g_source_set_callback ( source, (GSourceFunc)gmyth_monitor_handler_listener, NULL, NULL );

  //g_source_attach( source, io_watcher_context );

  //if (NULL == source){

  if (src_id < 0){

    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->monitor_th = g_thread_pool_new( (GThreadFunc)gmyth_monitor_handler_listener, 

  					monitor, TRUE, NULL );

 */				

  monitor->monitor_th = g_thread_pool_new( (GFunc)gmyth_monitor_handler_listener, 

  					monitor, 3, TRUE, NULL );

  g_thread_pool_push( monitor->monitor_th, monitor, NULL ); 

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

  if ( monitor->monitor_th != NULL )

  //if ( gmyth_monitor_handler_setup( monitor, monitor->event_sock->sd_io_ch ) )

  {

  	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;

  }

}