/**

 * GMyth Library

 *

 * @file gmyth/gmyth_file_transfer.c

 * 

 * @brief <p> GMythFileTransfer deals with the file streaming media remote/local

 * transfering 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 "gmyth_file_transfer.h"

#include "gmyth_livetv.h"

#include "gmyth_util.h"

#include "gmyth_socket.h"

#include "gmyth_stringlist.h"

#include "gmyth_debug.h"

#include "gmyth_uri.h"

#include "gmyth_marshal.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 "

/* default values to the file transfer parameters */

#define GMYTHTV_USER_READ_AHEAD			TRUE

#define GMYTHTV_RETRIES							-1

#define GMYTHTV_FILE_SIZE						0

#define GMYTHTV_BUFFER_SIZE					8*1024

#define GMYTHTV_VERSION							30

#define GMYTHTV_TRANSFER_MAX_WAITS	700

#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

enum myth_sock_types {

  GMYTH_PLAYBACK_TYPE = 0,

  GMYTH_MONITOR_TYPE,

  GMYTH_FILETRANSFER_TYPE,

  GMYTH_RINGBUFFER_TYPE

};

#define GMYTH_FILE_TRANSFER_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GMYTH_FILE_TRANSFER_TYPE, GMythFileTransferPrivate))

struct _GMythFileTransferPrivate {

	GMythLiveTV *livetv;

	gboolean do_next_program_chain;

};

static void gmyth_file_transfer_class_init          (GMythFileTransferClass *klass);

static void gmyth_file_transfer_init                (GMythFileTransfer *object);

static void gmyth_file_transfer_dispose  (GObject *object);

static void gmyth_file_transfer_finalize (GObject *object);

static void gmyth_file_transfer_program_info_changed( GMythFileTransfer *transfer, 

										gint msg_code, gpointer livetv_transfer );

static gboolean gmyth_connect_to_backend (GMythFileTransfer *transfer);

void gmyth_file_transfer_close( GMythFileTransfer *transfer );

static gboolean myth_control_acquire_context( gboolean do_wait );

static gboolean myth_control_release_context( );

G_DEFINE_TYPE(GMythFileTransfer, gmyth_file_transfer, G_TYPE_OBJECT)

static void

gmyth_file_transfer_class_init (GMythFileTransferClass *klass)

{

  GObjectClass *gobject_class;

  GMythFileTransferClass *gtransfer_class;

  gobject_class = (GObjectClass *) klass;

  gtransfer_class = (GMythFileTransferClass *) gobject_class;

  gobject_class->dispose  = gmyth_file_transfer_dispose;

  gobject_class->finalize = gmyth_file_transfer_finalize;

  g_type_class_add_private (gobject_class, sizeof (GMythFileTransferPrivate));

	gtransfer_class->program_info_changed_handler = gmyth_file_transfer_program_info_changed;

	gtransfer_class->program_info_changed_handler_signal_id = 

		  g_signal_new ( "program-info-changed",

		                 G_TYPE_FROM_CLASS (gtransfer_class),

		                 G_SIGNAL_RUN_LAST | G_SIGNAL_NO_RECURSE | G_SIGNAL_NO_HOOKS,

		                 0,

										 NULL,

										 NULL,

										 gmyth_marshal_VOID__INT_POINTER,

										 G_TYPE_NONE,

										 2,

										 G_TYPE_INT,

										 G_TYPE_POINTER );

}

static void

gmyth_file_transfer_init (GMythFileTransfer *transfer)

{ 

  g_return_if_fail( transfer != NULL );

  transfer->readposition = 0;

  transfer->filesize = GMYTHTV_FILE_SIZE;

  transfer->priv = GMYTH_FILE_TRANSFER_GET_PRIVATE(transfer);	

  transfer->priv->do_next_program_chain = FALSE;

  transfer->priv->livetv = NULL;

  transfer->control_sock = NULL;

  transfer->sock = NULL;

  transfer->mutex = g_mutex_new();

	g_signal_connect ( G_OBJECT (transfer), "program-info-changed",

              (GCallback)(GMYTH_FILE_TRANSFER_GET_CLASS(transfer)->program_info_changed_handler),

              NULL );

}

static void

gmyth_file_transfer_dispose  (GObject *object)

{

	GMythFileTransfer *transfer = GMYTH_FILE_TRANSFER (object);

  if ( transfer->mutex != NULL )  

  {

  	g_mutex_free( transfer->mutex );

  	transfer->mutex = NULL;

  }

  if ( transfer->control_sock != NULL )  

  {

  	g_object_unref( transfer->control_sock );

  	transfer->control_sock = NULL;

  }  

  if ( transfer->sock != NULL )  

  {

  	g_object_unref( transfer->sock );

  	transfer->sock = NULL;

  }

  if ( transfer->filename != NULL )  

  {

  	g_free( transfer->filename );

  	transfer->filename = NULL;

  }

  G_OBJECT_CLASS (gmyth_file_transfer_parent_class)->dispose (object);

}

static void

gmyth_file_transfer_finalize (GObject *object)

{

  g_signal_handlers_destroy (object);

  G_OBJECT_CLASS (gmyth_file_transfer_parent_class)->finalize (object);

}

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

GMythFileTransfer*

gmyth_file_transfer_new ( const GMythBackendInfo *backend_info)

{

  GMythFileTransfer *transfer = GMYTH_FILE_TRANSFER (g_object_new (GMYTH_FILE_TRANSFER_TYPE, NULL));

  transfer->backend_info = (GMythBackendInfo *)backend_info;

  g_object_ref (transfer->backend_info);

  return transfer;

}

GMythFileTransfer* 

gmyth_file_transfer_new_with_uri (const gchar* uri_str)

{

  GMythFileTransfer *transfer = GMYTH_FILE_TRANSFER (g_object_new (GMYTH_FILE_TRANSFER_TYPE, NULL));

  transfer->backend_info = gmyth_backend_info_new_with_uri (uri_str);

  return transfer;

}

gboolean

gmyth_file_transfer_open (GMythFileTransfer *transfer, const gchar* filename)

{

  gboolean ret = TRUE;

  g_return_val_if_fail (transfer != NULL, FALSE);

  g_return_val_if_fail (filename != NULL, FALSE);

  if (transfer->filename != NULL)

  {

    g_free (transfer->filename);

    transfer->filename = NULL;

  }

  transfer->filename = g_strdup (filename);

  /* configure the control socket */

  if (transfer->control_sock == NULL) { 

    if (!gmyth_connect_to_backend (transfer)) {

      gmyth_debug ("Connection to backend failed (Control Socket).\n");

      ret = FALSE;

    }

  } else {

    g_warning("Remote transfer control socket already created.\n");

  }

  gmyth_debug ("Got file with size = %lld.\n", transfer->filesize);

  return ret;

}

static gboolean

gmyth_connect_to_backend (GMythFileTransfer *transfer)

{

  GString *base_str = NULL;

  GString *hostname = NULL;

  GMythStringList *strlist = NULL; 

  gboolean ret = TRUE;

  g_return_val_if_fail (transfer != NULL, FALSE );

  base_str = g_string_new ("");

  /* Creates the control socket */

  if (transfer->control_sock != NULL) {

    g_object_unref (transfer->control_sock);

    transfer->control_sock = NULL;

  }

  transfer->control_sock = gmyth_socket_new();

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

  if (!gmyth_socket_connect_to_backend (transfer->control_sock,

        transfer->backend_info->hostname, transfer->backend_info->port, TRUE)) {

    g_object_unref (transfer->control_sock);

    transfer->control_sock = NULL;

    return FALSE;

  }

  /* Creates the data socket */

  if (transfer->sock != NULL) {

    g_object_unref (transfer->sock);

    transfer->sock = NULL;

  }

  transfer->sock = gmyth_socket_new ();

  gmyth_socket_connect (transfer->sock, transfer->backend_info->hostname, transfer->backend_info->port);

  strlist = gmyth_string_list_new();

  hostname = gmyth_socket_get_local_hostname();

  gmyth_debug( "[%s] MythTV version (from backend) = %d.\n", __FUNCTION__, transfer->control_sock->mythtv_version );

  if ( transfer->control_sock->mythtv_version > 26 )

  	g_string_printf( base_str, "ANN FileTransfer %s 1 -1", hostname->str);

  else

  	g_string_printf( base_str, "ANN FileTransfer %s", hostname->str);

  gmyth_string_list_append_string (strlist, base_str );

  gmyth_string_list_append_char_array (strlist, transfer->filename);

  gmyth_socket_write_stringlist (transfer->sock, strlist );

  gmyth_socket_read_stringlist (transfer->sock, strlist );

  /* file identification used in future file transfer requests to backend */

  transfer->file_id = gmyth_string_list_get_int( strlist, 1 );

  /* Myth URI stream file size - decoded using two 8-bytes sequences (64 bits/long long types) */

  transfer->filesize = gmyth_util_decode_long_long( strlist, 2 );

  gmyth_debug ( "[%s] ***** Received: recordernum = %d, filesize = %" G_GUINT64_FORMAT "\n", __FUNCTION__,

          transfer->file_id, transfer->filesize );

  if (transfer->filesize < 0 ) {

      gmyth_debug ( "[%s] Got filesize equals to %llu is lesser than 0 [invalid stream file]\n", __FUNCTION__, transfer->filesize );

      g_object_unref (transfer->sock);

      transfer->sock = NULL;

      ret = FALSE;

      goto cleanup;

  }

cleanup:

  if ( strlist != NULL )

    g_object_unref( strlist );

  g_string_free (base_str, TRUE);

  g_string_free (hostname, TRUE);

  return ret;

}    

void

gmyth_file_transfer_emit_program_info_changed_signal ( GMythFileTransfer *transfer, gint msg_code,

			gpointer live_tv ) 

{

				/*

	g_signal_emit_by_name ( G_OBJECT(transfer),

         "program-info-changed",

         msg_code, live_tv );

         */

  gmyth_debug( "Calling signal handler... [FILE_TRANSFER]" );

  g_signal_emit ( transfer,

         GMYTH_FILE_TRANSFER_GET_CLASS (transfer)->program_info_changed_handler_signal_id,

         0, /* details */

         msg_code, live_tv );

}

gboolean

gmyth_file_transfer_is_open (GMythFileTransfer *transfer)

{

    GMythStringList *strlist;

    GString *query;

    g_return_val_if_fail (transfer->control_sock != NULL, FALSE);

    g_return_val_if_fail (transfer->sock != NULL, FALSE);

    strlist = gmyth_string_list_new();

    query = g_string_new (GMYTHTV_QUERY_HEADER);

    g_string_append_printf (query, "%d", transfer->file_id );

    gmyth_string_list_append_string (strlist, query );

    gmyth_string_list_append_char_array( strlist, "IS_OPEN" );

    gmyth_socket_write_stringlist( transfer->control_sock, strlist );

    gmyth_socket_read_stringlist( transfer->control_sock, strlist );

    g_string_free (query, TRUE);

    g_object_unref (strlist);

    return ( strlist != NULL && gmyth_string_list_get_int( strlist, 0 ) == 1 );

}

void

gmyth_file_transfer_close( GMythFileTransfer *transfer )

{

  GMythStringList *strlist;

  GString *query;

  g_return_if_fail (transfer->control_sock != NULL);

  strlist = gmyth_string_list_new( );

  query = g_string_new (GMYTHTV_QUERY_HEADER);

  g_string_append_printf( query, "%d", transfer->file_id);

  gmyth_string_list_append_string( strlist, query );

  gmyth_string_list_append_char_array( strlist, "DONE" );

  if ( gmyth_socket_sendreceive_stringlist(transfer->control_sock, strlist) <= 0 ) {

    // fixme: time out???

    g_printerr( "Remote file timeout.\n" );

  }

  g_string_free (query, TRUE);

  g_object_unref (strlist);

  if (transfer->sock) {

    g_object_unref( transfer->sock );

    transfer->sock = NULL;

  }

  if (transfer->control_sock) {

    g_object_unref( transfer->control_sock );

    transfer->control_sock = NULL;

  } 

}

gint64

gmyth_file_transfer_seek(GMythFileTransfer *transfer, guint64 pos, gint whence)

{

  GMythStringList *strlist = gmyth_string_list_new();

  GString *query;

  g_return_val_if_fail (transfer->sock != NULL, -1);

  g_return_val_if_fail (transfer->control_sock != NULL, -1);

  strlist = gmyth_string_list_new();

  query = g_string_new (GMYTHTV_QUERY_HEADER);

  g_string_append_printf (query, "%d", transfer->file_id);

  myth_control_acquire_context( TRUE );

  gmyth_string_list_append_string( strlist, query );

  gmyth_string_list_append_char_array( strlist, "SEEK" );

  gmyth_string_list_append_uint64( strlist, pos );

  gmyth_string_list_append_int( strlist, whence );  

  if (pos > 0 )

    gmyth_string_list_append_uint64( strlist, pos );

  else

    gmyth_string_list_append_uint64( strlist, transfer->readposition );

  gmyth_socket_sendreceive_stringlist( transfer->control_sock, strlist );

  gint64 retval = gmyth_string_list_get_int64(strlist, 0);

  transfer->readposition = retval;

  gmyth_debug ( "[%s] got reading position pointer from the streaming = %lld\n", 

      __FUNCTION__, retval );

  myth_control_release_context( );

  return retval;

}

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;

  //myth_control_acquire_context (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;

}

gint 

gmyth_file_transfer_read(GMythFileTransfer *transfer, GByteArray *data, gint size, gboolean read_unlimited)

{

  gint bytes_sent = 0;

  gsize bytes_read = 0;

  gsize total_read = 0;

  GError *error = NULL;

  GIOChannel *io_channel;

  GIOChannel *io_channel_control;

  GIOCondition io_cond;

  GIOCondition io_cond_control;

  GIOStatus io_status = G_IO_STATUS_NORMAL, io_status_control = G_IO_STATUS_NORMAL;

  gboolean ret = TRUE;   

  GString *query;

  g_return_val_if_fail ( data != NULL, -2 );

  io_channel = transfer->sock->sd_io_ch;

  io_channel_control = transfer->control_sock->sd_io_ch;

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

  if ( io_status == G_IO_STATUS_NORMAL )

    gmyth_debug ( "[%s] Setting encoding to binary data socket).\n", __FUNCTION__ );

  io_cond = g_io_channel_get_buffer_condition( io_channel );  

  io_cond_control = g_io_channel_get_buffer_condition( io_channel );

  if ( transfer->sock == NULL || ( io_status == G_IO_STATUS_ERROR ) ) {

    g_printerr( "gmyth_file_transfer_read(): Called with no raw socket.\n" );

    //exit(0); // fixme remove this

    return -1;

  }

  if ( transfer->control_sock == NULL || ( io_status_control == G_IO_STATUS_ERROR ) ) {

    g_printerr( "gmyth_file_transfer_read(): Called with no control socket.\n" );

    //exit(0); // fixme remove this

    return -1;

  }

  query = g_string_new (GMYTHTV_QUERY_HEADER);

  g_string_append_printf ( query, "%d", transfer->file_id );

  gmyth_debug ("[%s] Transfer_query = %s\n", __FUNCTION__, query->str );

  /* send requests to the maximum number of REQUEST_BLOCK messages */

  guint max_tries = 5;

  myth_control_acquire_context( TRUE );

  while (total_read == 0 && --max_tries > 0) {

    GMythStringList *strlist = gmyth_string_list_new();

    gmyth_string_list_append_char_array( strlist, query->str );

    gmyth_string_list_append_char_array( strlist, "REQUEST_BLOCK" );

    gmyth_string_list_append_int( strlist, size );

    // Request the block to the backend

    gmyth_socket_write_stringlist( transfer->control_sock, strlist );

    // Receives the backand answer    

    gmyth_socket_read_stringlist( transfer->control_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] got SENT buffer message = %d\n", __FUNCTION__, bytes_sent );

    	if ( bytes_sent >= 0 ) 

    	{

        gchar *data_buffer = g_new0 ( gchar, bytes_sent );    

   	    while ( 0 != bytes_sent ) 

   	    { 

          io_status = g_io_channel_read_chars( io_channel, data_buffer + total_read, 

	    				(gsize) bytes_sent,	&bytes_read, &error );

	        total_read += bytes_read;

          bytes_sent -= bytes_read;

            /* append new data to the increasing byte array */

	    		data = g_byte_array_append (data, (const guint8*)data_buffer, bytes_read);

	        gmyth_debug ("Total transfer data read: %d\n", total_read);

        }

        g_free (data_buffer);

      } /* if */

    } else if ( !(transfer->priv != NULL && transfer->priv->livetv != NULL &&

					transfer->priv->do_next_program_chain) ) {

    	total_read = GMYTHTV_FILE_TRANSFER_READ_ERROR;

    	g_object_unref (strlist);

    	strlist = NULL;

    	break;

    }

    g_object_unref (strlist);

    strlist = NULL;

  }

  if ( bytes_sent == 0 && max_tries == 0 ) 

	{

		gmyth_debug( "Trying to move to the next program chain..." );

		transfer->priv = GMYTH_FILE_TRANSFER_GET_PRIVATE(transfer);

		if ( transfer->priv != NULL && transfer->priv->livetv != NULL &&

					transfer->priv->do_next_program_chain )

		{

			total_read = GMYTHTV_FILE_TRANSFER_NEXT_PROG_CHAIN;	

	  		g_mutex_lock( transfer->mutex );

	  		ret = gmyth_livetv_next_program_chain( transfer->priv->livetv );

	  		g_mutex_unlock( transfer->mutex );

			if ( !ret )

				gmyth_debug( "Cannot change to the next program chain!" );

			else

				gmyth_debug( "OK!!! MOVED to the next program chain [%s]!", 

										(gmyth_tvchain_get_id( transfer->priv->livetv->tvchain ))->str );						

		}

	} /* if */

  myth_control_release_context( );

  g_string_free (query, TRUE);

  if ( error != NULL ) {

    gmyth_debug ("Cleaning-up ERROR: %s [msg = %s, code = %d]\n", __FUNCTION__, error->message, 

	    error->code);

    g_error_free (error);

  }

  if ( total_read > 0 )

  	transfer->readposition += total_read;  	

  return total_read;

}

static void 

gmyth_file_transfer_program_info_changed( GMythFileTransfer *transfer, 

										gint msg_code, gpointer livetv_transfer )

{

	GMythLiveTV *livetv = GMYTH_LIVETV( livetv_transfer );

	gmyth_debug( "Program info changed! ( file transfer orig. = %p, ptr. = [%s], user data = [%s] )", transfer, 

		livetv_transfer != NULL ? "[NOT NULL]" : "[NULL]", livetv != NULL ? "[NOT NULL]" : "[NULL]" );

	if ( livetv != NULL && transfer == livetv->file_transfer )

	{

		gmyth_debug( "YES, the requested program info movement on the LiveTV transfer is authentical!" );

	}

	transfer->priv = GMYTH_FILE_TRANSFER_GET_PRIVATE(transfer);	

	transfer->priv->livetv = livetv;	

	transfer->priv->do_next_program_chain = TRUE;

	//g_object_unref( transfer );

}

gboolean 

gmyth_file_transfer_settimeout( GMythFileTransfer *transfer, gboolean fast )

{

  GMythStringList *strlist = NULL;

  g_return_val_if_fail (transfer->sock != NULL, FALSE);

  g_return_val_if_fail (transfer->control_sock != NULL, FALSE);

//  if ( transfer->timeoutisfast == fast )

//    return;

  strlist = gmyth_string_list_new(); 

  gmyth_string_list_append_char_array( strlist, GMYTHTV_QUERY_HEADER );

  gmyth_string_list_append_char_array( strlist, "SET_TIMEOUT" );

  gmyth_string_list_append_int( strlist, fast ); 

  gmyth_socket_write_stringlist( transfer->control_sock, strlist );

  gmyth_socket_read_stringlist( transfer->control_sock, strlist );

//  transfer->timeoutisfast = fast;

  return TRUE;

}

guint64

gmyth_file_transfer_get_filesize (GMythFileTransfer *transfer)

{

    g_return_val_if_fail (transfer != NULL, 0);

    return transfer->filesize;

}