/*

  * @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_file_transfer.h"

 #define GST_MYTHTV_ID_NUM               1

 #define MYTHTV_VERSION_DEFAULT          30

 static GnomeVFSResult do_read (GnomeVFSMethod *method,

                                GnomeVFSMethodHandle *method_handle,

                                gpointer buffer,

                                GnomeVFSFileSize num_bytes,

                                GnomeVFSFileSize *bytes_read,

                                GnomeVFSContext *context);

 typedef struct {

     GMythFileTransfer *file_transfer;

     gint mythtv_version;

     guint64 content_size;

     guint64 bytes_read;

     guint64 read_offset;

     gboolean live_tv;

 } MythtvHandle;

 static GnomeVFSResult

 do_open (GnomeVFSMethod *method,

          GnomeVFSMethodHandle **method_handle,

          GnomeVFSURI *uri,

          GnomeVFSOpenMode mode,

          GnomeVFSContext *context)

 {

     MythtvHandle *myth_handle = g_new0 (MythtvHandle, 1);

     const gchar *user, *password, *host, *transfer_uri;

     guint port;

     gchar *path;

     gboolean ret;

     _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 ((host = gnome_vfs_uri_get_host_name (uri)) == NULL) {

 	return GNOME_VFS_ERROR_INVALID_HOST_NAME;

     }

     /* Parse URI */

     path = gnome_vfs_unescape_string (uri->text, NULL);

     port = gnome_vfs_uri_get_host_port (uri);

     user = gnome_vfs_uri_get_user_name (uri);

     password = gnome_vfs_uri_get_password (uri);

     transfer_uri = gnome_vfs_uri_to_string (uri, 

 		    GNOME_VFS_URI_HIDE_USER_NAME | GNOME_VFS_URI_HIDE_PASSWORD);

     /* Initialize mythtv handler*/

     myth_handle->file_transfer = NULL;

     myth_handle->mythtv_version = MYTHTV_VERSION_DEFAULT;

     myth_handle->bytes_read = 0;

     myth_handle->content_size = -1;

     myth_handle->read_offset = 0;

     myth_handle->live_tv = FALSE;

     /* Connect to the backend */

     myth_handle->file_transfer = gmyth_file_transfer_new ( GST_MYTHTV_ID_NUM /*mythtv->live_tv_id*/,

         g_string_new( transfer_uri ), -1, myth_handle->mythtv_version );

     if ( myth_handle->file_transfer == NULL ) {

 	return GNOME_VFS_ERROR_NOT_OPEN;

     }

     /* sets the Playback monitor connection */

     ret = gmyth_file_transfer_playback_setup( &(myth_handle->file_transfer), myth_handle->live_tv );

     if (ret == FALSE) {

         g_printerr ("Mythtv FileTransfer playback setup error\n");

 	return GNOME_VFS_ERROR_NOT_OPEN;

     }

     /* sets the FileTransfer instance connection (video/audio download) */

     ret = gmyth_file_transfer_setup( &(myth_handle->file_transfer), myth_handle->live_tv );

     if ( ret == FALSE ) {

       g_printerr ("MythTV FileTransfer request failed when setting up socket connection!\n" );

       return GNOME_VFS_ERROR_NOT_OPEN;

     }

     // TODO: Verify if file exists in the backend

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

     *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;

     guint len = 0, offset = 0;

     GnomeVFSFileSize bytes_to_read;

     g_debug ("do_read(): file size: %llu, already read: %llu, requested: %llu", myth_handle->content_size,

 		    myth_handle->bytes_read, num_bytes);

     *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 (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. */

     // lock here ???

     while ( bytes_to_read > 0 ) {

   	len = gmyth_file_transfer_read( myth_handle->file_transfer,

 			buffer + offset, bytes_to_read, TRUE );

         if ( len > 0 ) {

             offset += len;      

             bytes_to_read -= len;

         } else {

 	    break;

         }

         if ( offset == num_bytes )

           break;

     }

     if (( offset <= 0 ) && !myth_handle->live_tv )

         return GNOME_VFS_ERROR_EOF;

     myth_handle->read_offset += offset;

     myth_handle->bytes_read += offset;

     *bytes_read = offset;

     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)

         g_object_unref (myth_handle->file_transfer);

     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)

 {

     GString *name = g_string_new ("hallyson");	

     file_info->name = g_string_free (name, FALSE);//"hallyson.txt";//get_base_from_uri (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;

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

     file_info->permissions =

         GNOME_VFS_PERM_USER_READ |

         GNOME_VFS_PERM_OTHER_READ |

         GNOME_VFS_PERM_GROUP_READ;

     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)

 {

 }