/*

  * @author Hallyson Melo <hallyson.melo@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

  */

 #ifdef HAVE_CONFIG_H

 #include <config.h>

 #endif

 #include <string.h>

 #include <glib.h>

 #include <math.h>

 #include <libgnomevfs/gnome-vfs-module.h>

 #include <libgnomevfs/gnome-vfs-utils.h>

 #include <gmyth/gmyth_file_transfer.h>

 #include <gmyth/gmyth_livetv.h>

 #include <gmyth/gmyth_uri.h>

 #include <gmyth/gmyth_recorder.h>

 #include <gmyth/gmyth_backendinfo.h>

 #include <gmyth/gmyth_util.h>

 #include <gmyth/gmyth_remote_util.h>

 #include <gmyth/gmyth_tvchain.h>

 #include <gmyth/gmyth_programinfo.h>

 #define GST_MYTHTV_ID_NUM               1

 #define MYTHTV_VERSION_DEFAULT          30

 #define MYTHTV_TRANSFER_MAX_WAITS       100

 /* internal GnomeVFS plug-in buffer size ( 120 Kbytes ) */

 #define MYTHTV_BUFFER_SIZE							1024*120

 /* internally sized GnomeVFS plug-in buffer ( 4 Kbytes ) */

 #define MYTHTV_MAX_VFS_BUFFER_SIZE			4096

 /* maximum number of bytes to be requested to the MythTV backend ( 64 Kbytes ) */

 #define MYTHTV_MAX_REQUEST_SIZE					1024*64

 static GnomeVFSResult do_read (GnomeVFSMethod *method,

                                GnomeVFSMethodHandle *method_handle,

                                gpointer buffer,

                                GnomeVFSFileSize num_bytes,

                                GnomeVFSFileSize *bytes_read,

                                GnomeVFSContext *context);

 typedef struct {

     GMythFileTransfer *file_transfer;

     GMythLiveTV 			*livetv;

     gchar 						*channel_name;

     gint mythtv_version;

     gint64 content_size;

     guint64 bytes_read;

     GByteArray *buffer;

     gsize buffer_remain;

     gboolean	is_livetv;

     gboolean configured;

 } MythtvHandle;

 //static MythtvHandle *myth_handle = NULL;

 static GnomeVFSResult

 do_open (GnomeVFSMethod *method,

          GnomeVFSMethodHandle **method_handle,

          GnomeVFSURI *uri,

          GnomeVFSOpenMode mode,

          GnomeVFSContext *context)

 { 

 		MythtvHandle *myth_handle = NULL;   

     GMythBackendInfo *backend_info = NULL;

     GMythURI *gmyth_uri = NULL;

     gboolean ret = TRUE;

     _GNOME_VFS_METHOD_PARAM_CHECK (method_handle != NULL);

     _GNOME_VFS_METHOD_PARAM_CHECK (uri != NULL);

     if (mode & GNOME_VFS_OPEN_WRITE) {

         return GNOME_VFS_ERROR_NOT_PERMITTED;

     }

     if (gnome_vfs_uri_get_host_name (uri) == NULL) {

     	return GNOME_VFS_ERROR_INVALID_HOST_NAME;

     }

     /*

     if ( method_handle != NULL && *method_handle != NULL )

     {

     	myth_handle = (MythtvHandle*)*method_handle;

     	//if ( !myth_handle->configured )    	

     }

     */

     if ( ( NULL == myth_handle ) || !myth_handle->configured ) {

     	myth_handle = g_new0 (MythtvHandle, 1);

     	myth_handle->configured = FALSE;

 	    myth_handle->is_livetv = FALSE;

 	    /* Initialize mythtv handler*/

 	    myth_handle->file_transfer = NULL;

 	    myth_handle->livetv = NULL;

 	    myth_handle->mythtv_version = MYTHTV_VERSION_DEFAULT;

 	    myth_handle->bytes_read = 0;

 	    myth_handle->content_size = (GnomeVFSFileSize) - 1;

 	    /* Creates and fills out the backend info structure */    

 		  backend_info = gmyth_backend_info_new_with_uri ( 

 		  			gnome_vfs_unescape_string( gnome_vfs_uri_to_string( uri, GNOME_VFS_URI_HIDE_NONE ), "" ) );

 		  /* creates an instance of  */  

 		  gmyth_uri = gmyth_uri_new_with_value( 

 		  		gnome_vfs_unescape_string( gnome_vfs_uri_to_string( uri, GNOME_VFS_URI_HIDE_NONE ), "" ) );

 		  myth_handle->is_livetv = gmyth_uri_is_livetv( gmyth_uri );

 		  /* Connect to the backend */	  

 		  if ( gmyth_uri != NULL && myth_handle->is_livetv == TRUE ) {

 		  	if ( NULL == myth_handle->livetv )

 		  	{

 		    	myth_handle->livetv = gmyth_livetv_new ();

 			    myth_handle->channel_name = gmyth_uri_get_channel_name( gmyth_uri );

 			    g_debug( "[%s] Channel name = %s\n", __FUNCTION__, myth_handle->channel_name );

 			    if ( myth_handle->channel_name != NULL ) {

 			      if (gmyth_livetv_channel_name_setup (myth_handle->livetv, myth_handle->channel_name,

 			              backend_info) == FALSE) {

 			        g_object_unref( gmyth_uri );

 			        ret = FALSE;

 			      }

 			    } else {

 			      if ( gmyth_livetv_setup (myth_handle->livetv, backend_info) == FALSE ) {

 			      	g_object_unref( gmyth_uri );

 			        ret = FALSE;

 			      }

 			    }

 		  	}

 		  	if ( NULL == myth_handle->file_transfer )	{

 		    	myth_handle->file_transfer = gmyth_livetv_create_file_transfer (myth_handle->livetv);

 			    if (NULL == myth_handle->file_transfer) {

 			      ret = FALSE;

 				    g_debug ("MythTV FileTransfer is NULL!\n");

 				    return GNOME_VFS_ERROR_NOT_OPEN;

 			    }

 		  		if ( !gmyth_file_transfer_open( myth_handle->file_transfer, myth_handle->livetv->uri != NULL ? 

 										gmyth_uri_get_path(myth_handle->livetv->uri) : 

 										myth_handle->livetv->proginfo->pathname->str ) )

 					{

 						g_debug ("Couldn't open MythTV FileTransfer is NULL!\n");

 						g_object_unref( myth_handle->file_transfer );

 						myth_handle->file_transfer = NULL;

 						ret = FALSE;

 					}

 		  	} /* if - FileTransfer is NULL, or not */

 		  } else {

 		  	if (NULL == myth_handle->file_transfer ) {

 			    myth_handle->file_transfer = gmyth_file_transfer_new (backend_info);

 			    /* Verifies if the file exists */

 			    if (!gmyth_util_file_exists (backend_info, gmyth_uri_get_path (gmyth_uri))) {

 			        g_object_unref (backend_info);

 							ret = FALSE;

 			    }

 			    /* sets the Playback monitor connection */

 			    ret = gmyth_file_transfer_open ( myth_handle->file_transfer, 

 			    		gmyth_uri_get_path (gmyth_uri) );

 		  	}

 		  } /* if - LiveTV or not? */

 	    if (ret == FALSE) {

 		    g_debug ("MythTV FileTransfer open error.\n");

 		    return GNOME_VFS_ERROR_NOT_OPEN;

 		  }

 		  myth_handle->configured = TRUE;

 	    g_object_unref (backend_info);

 		  if ( gmyth_uri != NULL )

 		  	g_object_unref( gmyth_uri );

 	    myth_handle->buffer = g_byte_array_sized_new (MYTHTV_BUFFER_SIZE);

 	    myth_handle->buffer_remain = 0;

 		  g_return_val_if_fail (myth_handle->file_transfer != NULL, GNOME_VFS_ERROR_NOT_OPEN);

 		  if ( /*myth_handle->file_transfer->filesize <= 0 && */myth_handle->is_livetv ) {

 		  	myth_handle->content_size = gmyth_recorder_get_file_position(myth_handle->livetv->recorder);

 		  } else {

 	    	myth_handle->content_size = myth_handle->file_transfer->filesize;

 		  }

     } /* if - configured or not? */

     *method_handle = (GnomeVFSMethodHandle *) myth_handle;

     return GNOME_VFS_OK;

 }

 static GnomeVFSResult

 do_read (GnomeVFSMethod *method,

          GnomeVFSMethodHandle *method_handle,

          gpointer buffer,

          GnomeVFSFileSize num_bytes,

          GnomeVFSFileSize *bytes_read,

          GnomeVFSContext *context)

 {

   MythtvHandle *myth_handle = (MythtvHandle *) method_handle;

   GnomeVFSFileSize bytes_to_read = num_bytes;

   if ( !myth_handle->is_livetv && ( myth_handle->bytes_read >= myth_handle->content_size ) )

       return GNOME_VFS_ERROR_EOF;

   /* fixme: change this to min math function */

   if (( myth_handle->content_size > 0 ) ) 

   {

   	if ( !myth_handle->is_livetv && 

   				( num_bytes > ( myth_handle->content_size - myth_handle->bytes_read ) ) )

   	{

     	bytes_to_read = myth_handle->content_size - myth_handle->bytes_read;

   	}

   }

   /* Loop sending the Myth File Transfer request:

    * Retry whilst authentication fails and we supply it. */

   if ( ( myth_handle->buffer_remain = myth_handle->buffer->len ) < bytes_to_read ) 

   {

   	gint buffer_size;

   	while ( MYTHTV_BUFFER_SIZE != myth_handle->buffer_remain ) {

 	  	/* resize buffer length request to no more than MYTHTV_MAX_REQUEST_SIZE */

 	  	if ( ( MYTHTV_BUFFER_SIZE - myth_handle->buffer_remain ) <= MYTHTV_MAX_REQUEST_SIZE )

 	  		buffer_size = MYTHTV_BUFFER_SIZE - myth_handle->buffer_remain;

 	  	else

 	  		buffer_size = MYTHTV_MAX_REQUEST_SIZE;

 	  	GByteArray *tmp_buffer = g_byte_array_new();

 			g_debug ("XXXXXXXXXX Asking %d bytes (there is %d bytes in the buffer)\n", 

 					buffer_size, myth_handle->buffer_remain);

 	    gint len = gmyth_file_transfer_read (myth_handle->file_transfer,

 	          tmp_buffer, buffer_size, TRUE);

 			if (!myth_handle->is_livetv && len < 0) {

 		    g_byte_array_free (tmp_buffer, TRUE);

 		    g_debug ("Fail to read bytes");

 		    return GNOME_VFS_ERROR_IO;

 		  } /*else if (len == 0) {

 			    g_byte_array_free (tmp_buffer, TRUE);

 			    g_warning ("End of file probably achieved");

 			    return GNOME_VFS_ERROR_EOF;

 			}*/

 	    myth_handle->buffer = g_byte_array_append ( myth_handle->buffer,

 	    		tmp_buffer->data, len );

 			myth_handle->buffer_remain += len;

 			if ( tmp_buffer != NULL )

 			{

 	      g_byte_array_free ( tmp_buffer, TRUE );

 	    	tmp_buffer = NULL;

 			}

   	} /* while - iterates until fills the internal buffer */

   } /* if - got from the network, or not */

   bytes_to_read = ( bytes_to_read > myth_handle->buffer_remain ) ? myth_handle->buffer_remain : bytes_to_read;

   /* gets the first buffer_size bytes from the byte array buffer variable */ 

   g_memmove (buffer, myth_handle->buffer->data, bytes_to_read);

   myth_handle->bytes_read += bytes_to_read;

   myth_handle->buffer_remain -= bytes_to_read;

 	/* flushs the newly buffer got from byte array */

 	myth_handle->buffer = g_byte_array_remove_range (myth_handle->buffer, 0, bytes_to_read);

 	g_debug ("Got from %llu bytes from internal buffer. (there are %d bytes in the buffer, from a total of %llu dispatched.)\n", 

 				bytes_to_read, myth_handle->buffer_remain, myth_handle->bytes_read );

  	*bytes_read = bytes_to_read;

   return GNOME_VFS_OK;

 }

 static GnomeVFSResult

 do_close (GnomeVFSMethod *method,

           GnomeVFSMethodHandle *method_handle,

           GnomeVFSContext *context)

 {

   MythtvHandle *myth_handle = (MythtvHandle *) method_handle;

   //if ( NULL == myth_handle || myth_handle->configured ) {

 	  if (myth_handle->file_transfer != NULL) {

 	    g_object_unref (myth_handle->file_transfer);

 	  	myth_handle->file_transfer = NULL;

 	  }

 	  if (myth_handle->is_livetv && myth_handle->livetv != NULL) {

 	    g_object_unref (myth_handle->livetv);

 	  	myth_handle->livetv = NULL;

 	  }

 	  if (myth_handle->buffer) {

 			g_byte_array_free (myth_handle->buffer, TRUE);

 			myth_handle->buffer = NULL;

 	  }

 	  myth_handle->configured = FALSE;

 	  g_free (myth_handle);

 	  myth_handle = NULL;	    

  // }

   return GNOME_VFS_OK;

 }

 static GnomeVFSResult

 do_get_file_info (GnomeVFSMethod *method,

                   GnomeVFSURI *uri,

                   GnomeVFSFileInfo *file_info,

                   GnomeVFSFileInfoOptions options,

                   GnomeVFSContext *context)

 {

     GMythFileTransfer *file_transfer = NULL;

     GMythRecorder			*recorder 		 = NULL;

     GMythTVChain			*tvchain	 		 = NULL;

     GMythBackendInfo  *backend_info  = NULL;

     GMythURI					*gmyth_uri		 = NULL;

 		GMythSocket 			*socket 			 = NULL;		 

     gboolean 					is_livetv 		 = FALSE;

     gboolean					ret						 = TRUE;

     gboolean 					res 					 = TRUE;

     /* Creates and fills out the backend info structure */    

 	  backend_info = gmyth_backend_info_new_with_uri ( 

 	  			gnome_vfs_unescape_string( gnome_vfs_uri_to_string( uri, GNOME_VFS_URI_HIDE_NONE ), "" ) );

 	  /* creates an instance of */  

 	  gmyth_uri = gmyth_uri_new_with_value( 

 	  		gnome_vfs_unescape_string( gnome_vfs_uri_to_string( uri, GNOME_VFS_URI_HIDE_NONE ), "" ) );

 	  is_livetv = gmyth_uri_is_livetv( gmyth_uri );

     file_info->valid_fields = file_info->valid_fields

         | GNOME_VFS_FILE_INFO_FIELDS_TYPE

         | GNOME_VFS_FILE_INFO_FIELDS_MIME_TYPE

         | GNOME_VFS_FILE_INFO_FIELDS_PERMISSIONS;

     file_info->type = GNOME_VFS_FILE_TYPE_REGULAR;

     /* fixme: get from file extension? */

     file_info->mime_type = g_strdup ("video/x-nuv");

     file_info->permissions =

         GNOME_VFS_PERM_USER_READ |

         GNOME_VFS_PERM_OTHER_READ |

         GNOME_VFS_PERM_GROUP_READ;

     g_print( "gnome_vfs_uri == %s | gmyth_uri == %s.\n",

     				gnome_vfs_uri_get_path (uri),

     				gmyth_uri_get_path (gmyth_uri) );

 	  /* Connect to the backend */

 	  if ( gmyth_uri != NULL && is_livetv == TRUE ) {

 	  	/* start to get file info from LiveTV remote encoder */	  	

 			socket = gmyth_socket_new ();

 			/* FIME: Implement this at gmyth_socket */

 			res = gmyth_socket_connect_to_backend (socket, backend_info->hostname,

 					backend_info->port, TRUE);

 			if (!res) {

 				g_print ("[%s] LiveTV can not connect to backend", __FUNCTION__);	

 				res = FALSE;

 				goto error;

 			}

 			if ( gmyth_remote_util_get_free_recorder_count (socket) <= 0 ) {

 				g_print ("No free remote encoder available.");

 				res = FALSE;

 				goto error;

 			}

 			/* Gets the recorder num */

 			recorder = remote_request_next_free_recorder (socket, -1);

 			//if ( socket != NULL )

 			//	g_object_unref (socket);

 			if ( recorder == NULL ) {

 				g_print ("[%s] None remote encoder available", __FUNCTION__);

 				res = FALSE;

 				goto error;

 			}

 			/* Init remote encoder. Opens its control socket. */

 			res = gmyth_recorder_setup(recorder);

 			if ( !res ) {

 				g_print ("[%s] Fail while setting remote encoder\n", __FUNCTION__);

 				res = FALSE;

 				goto error;

 			}

 			/* Creates livetv chain handler */

 			tvchain = gmyth_tvchain_new();

 			gmyth_tvchain_initialize ( tvchain, backend_info );

 			if ( tvchain == NULL || tvchain->tvchain_id == NULL ) {

 				res = FALSE;

 				goto error;

 			}

 			// Spawn live tv. Uses the socket to send mythprotocol data to start livetv in the backend (remotelly)

 			res = gmyth_recorder_spawntv ( recorder,

 					gmyth_tvchain_get_id(tvchain) );

 			if (!res) {

 				g_warning ("[%s] Fail while spawn tv\n", __FUNCTION__);

 				res = FALSE;

 				goto error;

 			}	

 		  //gchar* channel_name = gmyth_uri_get_channel_name( gmyth_uri );		  

 		  /* DEBUG message */

 			GMythProgramInfo* prog_info = gmyth_recorder_get_current_program_info( recorder );

 			if ( prog_info != NULL )

 			{

 				//gmyth_program_info_print( prog_info );

 				g_debug( "Program Info: %s\n", gmyth_program_info_to_string( prog_info ) ); 

 		    g_print( "path = %s",  prog_info->pathname->str );

 		    file_info->name = g_strdup ( g_strrstr( prog_info->pathname->str, "/" ) );

 			} else {

 				file_info->name = g_strdup ( "LiveTV.nuv" );

 				file_info->size = gmyth_recorder_get_file_position( recorder );

 			}

 	    if ( recorder != NULL )

 	    	g_object_unref (recorder);

 	    if ( prog_info != NULL )

 	    	g_object_unref( prog_info );

 	    if ( tvchain != NULL )

 	    	g_object_unref (tvchain);

 	    file_info->size = (GnomeVFSFileSize) - 1;

 	  } else {

 	  	/* start to get file info from remote file encoder */	

 	    file_transfer = gmyth_file_transfer_new (backend_info);

 	    /* Verifies if the file exists */

 	    if (!gmyth_util_file_exists (backend_info, gmyth_uri_get_path (gmyth_uri))) {

 	        g_object_unref (backend_info);

 					return GNOME_VFS_ERROR_NOT_FOUND;

 	    }

 	    /* sets the Playback monitor connection */

 	    ret = gmyth_file_transfer_open ( file_transfer, gmyth_uri_get_path (gmyth_uri) );

 	    file_info->name = g_strdup ( gnome_vfs_uri_get_path (uri) );

 	  } /* if - LiveTV or not? */	  

     if (ret == FALSE) {

 	    g_debug ("MythTV FileTransfer open error\n");

 	    return GNOME_VFS_ERROR_NOT_OPEN;

 	  }

 		if ( ret == TRUE  && file_transfer != NULL ) {

     	file_info->size = gmyth_file_transfer_get_filesize (file_transfer);

 	    if ( file_transfer )

 	    	g_object_unref (file_transfer);

    	}

     file_info->block_count = GNOME_VFS_FILE_INFO_FIELDS_BLOCK_COUNT;

 	  file_info->io_block_size = GNOME_VFS_FILE_INFO_FIELDS_IO_BLOCK_SIZE;

 error:

     if (backend_info)

    		g_object_unref (backend_info);

    	if (!res)

    		return GNOME_VFS_ERROR_IO;

     return GNOME_VFS_OK;

 }

 static gboolean

 do_is_local (GnomeVFSMethod *method,

              const GnomeVFSURI *uri)

 {

 	return FALSE;

 }

 static GnomeVFSMethod method = {

 	sizeof (GnomeVFSMethod),

 	do_open,

 	NULL,

 	do_close,

 	do_read,

 	NULL,

 	NULL,

 	NULL,

 	NULL,

 	NULL,

 	NULL,

 	NULL,

 	do_get_file_info,

 	NULL,

 	do_is_local,

 	NULL,

 	NULL,

 	NULL,

 	NULL,

 	NULL,

 	NULL,

 	NULL,

 	NULL,

 	NULL,

 	NULL,

 	NULL,

 	NULL,

 };

 GnomeVFSMethod *

 vfs_module_init (const char *method_name, const char *args)

 {

 	return &method;

 }

 void

 vfs_module_shutdown (GnomeVFSMethod *method)

 {

 }