/*

  * @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

 #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;

     gint mythtv_version;

     guint64 content_size;

     guint64 bytes_read;

     guint8 *buffer;

     gsize buffer_offset;

     gsize buffer_remain;

 } MythtvHandle;

 static GnomeVFSResult

 do_open (GnomeVFSMethod *method,

          GnomeVFSMethodHandle **method_handle,

          GnomeVFSURI *uri,

          GnomeVFSOpenMode mode,

          GnomeVFSContext *context)

 {

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

     MythtvHandle *myth_handle;

     GString *uri_str;

     guint port;

     gchar *path;

     gboolean ret;

     _GNOME_VFS_METHOD_PARAM_CHECK (method_handle != NULL);

     _GNOME_VFS_METHOD_PARAM_CHECK (uri != NULL);

     g_debug ("[%s] Calling do_open function", __FUNCTION__);

     myth_handle = g_new0 (MythtvHandle, 1);

     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;

     /* Connect to the backend */

     myth_handle->file_transfer = gmyth_file_transfer_new ();

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

     /* sets the Playback monitor connection */

     uri_str = g_string_new (transfer_uri);

     ret = gmyth_file_transfer_open (myth_handle->file_transfer, uri_str);

     if (ret == FALSE) {

         g_printerr ("Mythtv FileTransfer open error\n");

         return GNOME_VFS_ERROR_NOT_OPEN;

     }

     g_string_free (uri_str, TRUE);

     // TODO: Verify if file exists in the backend

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

     myth_handle->buffer = g_malloc0 (MYTHTV_BUFFER_SIZE);

     myth_handle->buffer_offset = 0;

     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;

     g_debug ("do_read(): file size: %llu, already read: %llu, requested: %llu, buffer_offset: %du, buffer_remain: %du", 

 		    myth_handle->content_size, myth_handle->bytes_read, num_bytes, 

 		    myth_handle->buffer_offset, myth_handle->buffer_remain);

     *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. */

     if (bytes_to_read > myth_handle->buffer_remain ) {

 	guint8 *tmp_buffer = g_malloc0 (MYTHTV_BUFFER_SIZE);

 	gint len;

 	if (myth_handle->buffer_remain > (MYTHTV_BUFFER_SIZE >> 1)) {

 	    // Avoid overlap creating another buffer, in the case the remaining data is bigger than half buffer size

 	    tmp_buffer = g_malloc0 (MYTHTV_BUFFER_SIZE);

 	    memcpy (tmp_buffer, myth_handle->buffer + myth_handle->buffer_offset, myth_handle->buffer_remain);

 	    g_free (myth_handle->buffer);

 	    myth_handle->buffer = tmp_buffer;

 	} else {

 	    memcpy (myth_handle->buffer, myth_handle->buffer + myth_handle->buffer_offset, myth_handle->buffer_remain);

 	}

 	g_debug ("Reading %d data from backend", MYTHTV_BUFFER_SIZE- myth_handle->buffer_remain);

         len = gmyth_file_transfer_read( myth_handle->file_transfer,

 	            myth_handle->buffer + myth_handle->buffer_remain, 

 		    MYTHTV_BUFFER_SIZE- myth_handle->buffer_remain, TRUE );

 	if (len < 0)

 	    return GNOME_VFS_ERROR_IO;

 	myth_handle->buffer_offset = 0;

 	myth_handle->buffer_remain += len;

     }

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

     g_debug ("Returning %du bytes to gnomevfs", (int) bytes_to_read);

     memcpy (buffer, myth_handle->buffer + myth_handle->buffer_offset, bytes_to_read);

     myth_handle->bytes_read += bytes_to_read;

     myth_handle->buffer_offset += bytes_to_read;

     myth_handle->buffer_remain -= 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;

     }

     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)

 {

     file_info->name = g_strdup ("fixme.txt");

     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;

     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)

 {

 }