/**

  * 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->allow_msgs_listener = TRUE;

   //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);

 	monitor->allow_msgs_listener = FALSE;

 	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 )

 	{

 		gmyth_debug( "MONITOR HANDLER - Received backend message = %s", back_msg->str );

   	*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 ), "SCHEDULE_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;

     	} else if ( g_strstr_len( *back_msg_action, strlen( *back_msg_action ), "DONE_RECORDING" ) ) {

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

     		msg_type = GMYTH_BACKEND_DONE_RECORDING;

     	}    	  	

       //g_hash_table_insert ( monitor->backend_msgs,

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

 	  } // 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 (monitor->allow_msgs_listener) {

   	++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;

   }

 }