/*

 * @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)

{

}