/*

 * @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>

#define GST_MYTHTV_ID_NUM               1

#define MYTHTV_VERSION_DEFAULT          30

#define MYTHTV_TRANSFER_MAX_WAITS       100

#define MYTHTV_BUFFER_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;

} MythtvHandle;

static GnomeVFSResult

do_open (GnomeVFSMethod *method,

         GnomeVFSMethodHandle **method_handle,

         GnomeVFSURI *uri,

         GnomeVFSOpenMode mode,

         GnomeVFSContext *context)

{

    MythtvHandle *myth_handle;

    GMythBackendInfo *backend_info;

    GMythURI *gmyth_uri = NULL;

    gboolean ret = TRUE;

    gboolean is_livetv = FALSE;

    _GNOME_VFS_METHOD_PARAM_CHECK (method_handle != NULL);

    _GNOME_VFS_METHOD_PARAM_CHECK (uri != NULL);

    myth_handle = g_new0 (MythtvHandle, 1);

    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;

    }

    /* 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 ), "" ) );

	  is_livetv = gmyth_uri_is_livetv( gmyth_uri );

	  /* Connect to the backend */	  

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

	    myth_handle->livetv = gmyth_livetv_new ();

	    myth_handle->channel_name = gmyth_uri_get_channel_name( gmyth_uri );

	    g_print( "[%s] Channel name = %s", __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;

	      }

	    }

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

	    if (NULL == myth_handle->file_transfer) {

	      ret = FALSE;

		    g_warning ("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_object_unref( myth_handle->file_transfer );

				myth_handle->file_transfer = NULL;

				ret = FALSE;

			}

	  } else {

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

	    return GNOME_VFS_ERROR_NOT_OPEN;

	  }

    g_object_unref (backend_info);

	  //if ( gmyth_uri != NULL )

	  //	g_object_unref( gmyth_uri );

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

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

	  	myth_handle->content_size = (GnomeVFSFileSize) 0;

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

	  } else		

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

    myth_handle->buffer = g_byte_array_sized_new (MYTHTV_BUFFER_SIZE);

    myth_handle->buffer_remain = 0;

    *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;

  *bytes_read = 0;

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

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

  else

    bytes_to_read = num_bytes;

  /* Loop sending the Myth File Transfer request:

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

  //if (myth_handle->buffer_remain  < MYTHTV_BUFFER_SIZE) {

  if ( ( myth_handle->buffer_remain = myth_handle->buffer->len ) < MYTHTV_BUFFER_SIZE ) {

  	GByteArray *tmp_buffer = g_byte_array_new();

		printf ("XXXXXXXXXXXXXX Pedindo %d %d\n", MYTHTV_BUFFER_SIZE, myth_handle->buffer_remain);

    gint len = gmyth_file_transfer_read (myth_handle->file_transfer,

          tmp_buffer, MYTHTV_BUFFER_SIZE - myth_handle->buffer_remain, TRUE);

		if (len < 0) {

	    g_byte_array_free (tmp_buffer, TRUE);

	    g_print ("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;

      g_byte_array_free (tmp_buffer, TRUE);

    	tmp_buffer = NULL;

    }

    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);

    *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 (myth_handle->file_transfer) {

	    gmyth_file_transfer_close (myth_handle->file_transfer);

        g_object_unref (myth_handle->file_transfer);

    	myth_handle->file_transfer = NULL;

    }

    if (myth_handle->livetv) {

      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;

    }

    g_free (myth_handle);

    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;

    /* 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 ) {

	  	gboolean res = 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 ) {

				g_print ("[%s] TVChain couldn't be initialized.\n", __FUNCTION__);

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

				res = FALSE;

				goto error;

			}

		  gchar* channel_name = gmyth_uri_get_channel_name( gmyth_uri );

		  if ( res == TRUE ) {

		    /* loop finished, set the max tries variable to zero again... */

		    gint wait_to_transfer = 0;

		    while ( wait_to_transfer++ < MYTHTV_TRANSFER_MAX_WAITS &&

		        (gmyth_recorder_is_recording (recorder) == FALSE) )

		      g_usleep (500);

		    /* IS_RECORDING again, just like the MythTV backend does... */

		    gmyth_recorder_is_recording (recorder);

				if ( channel_name != NULL ) 

				{

					/* Pauses remote encoder. */

					res = gmyth_recorder_pause_recording(recorder);

					if ( !res ) {

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

						res = FALSE;

						goto error;

					}

			  	if ( gmyth_recorder_check_channel_name( recorder, channel_name ) )

			  	{

				  	if ( !gmyth_recorder_set_channel_name( recorder, channel_name ) )

				  	{

				  		g_warning( "Channel will not changes to: [%s].\n", channel_name );

				  	}

			  	}

				} /* if - changes the channel number */

				sleep( 1 );

		  }

		  /* DEBUG message */  

			GMythProgramInfo* prog_info = gmyth_recorder_get_current_program_info( recorder );

			//gmyth_debug( "New ProgramInfo...\n" );

			gmyth_program_info_print( prog_info );

			if ( prog_info != NULL )

			{

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

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

	  		gint64 size = 0;

	  		size = gmyth_recorder_get_file_position( recorder );

	  		if( size < 0 )

	  		{

	  			//GMythProgramInfo *prog_info = gmyth_recorder_get_current_program_info ( recorder );

	  			file_info->size = prog_info->filesize;

	  		}

				else

					file_info->size = size; 

			} else {

				file_info->size = gmyth_recorder_get_file_position( recorder );

			}

	    if ( tvchain != NULL)

	    	g_object_unref (tvchain);

	    if ( recorder != NULL )

	    	gmyth_recorder_close (recorder);

	    if ( prog_info != NULL )

	    	g_object_unref( prog_info );

	  } 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 )

	    	gmyth_file_transfer_close (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);

    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)

{

}