/*
 * @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*80
/* 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)
{
}