/*
     This file is part of GNUnet.
     (C) 2010 Christian Grothoff (and other contributing authors)

     GNUnet is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published
     by the Free Software Foundation; either version 2, or (at your
     option) any later version.

     GNUnet 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 General Public License
     along with GNUnet; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
     Boston, MA 02111-1307, USA.
*/

/**
 * @file src/fs/gnunet-fs-gtk_common.c
 * @brief Common functions used in various places
 * @author Christian Grothoff
 */
#include "gnunet-fs-gtk-common.h"

/**
 * Converts metadata specified by @data of size @data_len
 * and saved in format @format to UTF-8 encoded string.
 * Works only for C-string and UTF8 metadata formats
 * (returns NULL for everything else).
 * Verifies UTF-8 strings.
 *
 * @param format format of the @data
 * @param data data to convert
 * @param data_len length of the data buffer (in bytes)
 * @return NULL if can't be converted, allocated string otherwise,
 *         freeable with GNUNET_free* ().
 */
char *
GNUNET_FS_GTK_dubious_meta_to_utf8 (enum EXTRACTOR_MetaFormat format,
                                    const char *data, size_t data_len)
{
  switch (format)
  {
  case EXTRACTOR_METAFORMAT_UTF8:
    /* data must not contain NULLs (hence the -1) */
    if (g_utf8_validate (data, data_len - 1, NULL))
      return GNUNET_strdup (data);
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
		_("Failed to validate supposedly utf-8 string `%s' of length %u, assuming it to be a C string\n"),
		data, 
		(unsigned int) data_len);
    format = EXTRACTOR_METAFORMAT_C_STRING;
    /* fall-through */
  case EXTRACTOR_METAFORMAT_C_STRING:  
    if (data_len > 0)
    {
      /* There are no guarantees that data is NULL-terminated, AFAIU,
       * so let's play it safe, shall we?
       */
      char data_copy[data_len + 1];

      memcpy (data_copy, data, data_len);
      data_copy[data_len] = '\0';
      return GNUNET_GTK_from_loc_to_utf8 (data_copy);
    }
    break;
  default:
    break;
  }
  return NULL;
}


/**
 * Add meta data to list store.
 *
 * @param cls closure (the GtkListStore)
 * @param plugin_name name of the plugin that produced this value;
 *        special values can be used (i.e. '<zlib>' for zlib being
 *        used in the main libextractor library and yielding
 *        meta data).
 * @param type libextractor-type describing the meta data
 * @param format basic format information about data
 * @param data_mime_type mime-type of data (not of the original file);
 *        can be NULL (if mime-type is not known)
 * @param data actual meta-data found
 * @param data_len number of bytes in data
 * @return 0 to continue (always)
 */
int
GNUNET_FS_GTK_add_meta_data_to_list_store (void *cls, const char *plugin_name,
                                           enum EXTRACTOR_MetaType type,
                                           enum EXTRACTOR_MetaFormat format,
                                           const char *data_mime_type,
                                           const char *data, size_t data_len)
{
  GtkListStore *ls = GTK_LIST_STORE (cls);
  char *data_to_insert;

  data_to_insert = GNUNET_FS_GTK_dubious_meta_to_utf8 (format, data, data_len);
  if (NULL == data_to_insert)
    return 0;
  gtk_list_store_insert_with_values (ls, NULL, G_MAXINT, 0, type, 1, format,
				     2, EXTRACTOR_metatype_to_string (type),
				     3, data_to_insert, -1);
  GNUNET_free (data_to_insert); 
  return 0;
}


/**
 * Convert the year from the spin button to an expiration
 * time (on midnight, January 1st of that year).
 *
 * @param spin button with an expiration year
 * @return expiration time in the usual GNUnet format
 */
struct GNUNET_TIME_Absolute
GNUNET_FS_GTK_get_expiration_time (GtkSpinButton * spin)
{
  struct GNUNET_TIME_Absolute ret;
  int year;

  year = gtk_spin_button_get_value_as_int (spin);
  GNUNET_assert (year >= 0);
  ret = GNUNET_FS_year_to_time ((unsigned int) year);
  GNUNET_break (GNUNET_TIME_absolute_get ().abs_value < ret.abs_value);
  return ret;
}


/**
 * Initialize the 'expiration_year_adjustment' of the given
 * builder to have a lower range of current-year+1 and a
 * default of current-year+2.
 *
 * @param builder builder object for which we should manipulate
 * the adjustment
 */
void
GNUNET_FS_GTK_setup_expiration_year_adjustment (GtkBuilder * builder)
{
  GtkAdjustment *aj;
  unsigned int year;

  year = GNUNET_FS_get_current_year ();
  aj = GTK_ADJUSTMENT (gtk_builder_get_object
                       (builder, "expiration_year_adjustment"));
  gtk_adjustment_set_value (aj, year + 2);
  gtk_adjustment_set_lower (aj, year + 1);
}


/**
 * Obtain pixbuf from thumbnail data in meta data.
 *
 * @param meta input meta data
 * @return NULL on error, otherwise the embedded thumbnail
 */
GdkPixbuf *
GNUNET_FS_GTK_get_thumbnail_from_meta_data (const struct
                                            GNUNET_CONTAINER_MetaData *meta)
{
  GdkPixbuf *pixbuf;
  GdkPixbufLoader *loader;
  size_t ts;
  unsigned char *thumb;

  thumb = NULL;
  ts = GNUNET_CONTAINER_meta_data_get_thumbnail (meta, &thumb);
  if (0 == ts)
    return NULL;
  loader = gdk_pixbuf_loader_new ();
  gdk_pixbuf_loader_write (loader, (const guchar *) thumb, ts, NULL);
  pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
  gdk_pixbuf_loader_close (loader, NULL);
  if (NULL != pixbuf)
    g_object_ref (pixbuf);
  g_object_unref (loader);
  GNUNET_free (thumb);
  return pixbuf;
}


/**
 * mmap the given file and run the GNUNET_FS_directory_list_contents
 * function on it.
 *
 * @param filename name with the directory
 * @param dep function to call on each entry
 * @param dep_cls closure for 'dep'
 */
void
GNUNET_FS_GTK_mmap_and_scan (const char *filename,
                             GNUNET_FS_DirectoryEntryProcessor dep,
                             void *dep_cls)
{
  struct GNUNET_DISK_FileHandle *fh;
  struct GNUNET_DISK_MapHandle *mh;
  uint64_t fsize;
  void *ddata;

  if (GNUNET_OK != GNUNET_DISK_file_size (filename, &fsize, GNUNET_YES))
  {
    GNUNET_break (0);
    return;
  }
  if (NULL == (fh = GNUNET_DISK_file_open (filename, GNUNET_DISK_OPEN_READ,
					   GNUNET_DISK_PERM_NONE)))
  {
    GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, "open", filename);
    return;
  }
  if (NULL == (ddata = GNUNET_DISK_file_map (fh, &mh, GNUNET_DISK_MAP_TYPE_READ, (size_t) fsize)))
  {
    GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, "mmap", filename);
    GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fh));
    return;
  }
  if (GNUNET_SYSERR ==
      GNUNET_FS_directory_list_contents ((size_t) fsize, ddata, 0, dep,
                                         dep_cls))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                _("Selected file `%s' is not a GNUnet directory!\n"), filename);
  }
  GNUNET_break (GNUNET_OK == GNUNET_DISK_file_unmap (mh));
  GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fh));
}

/* end of gnunet-fs-gtk-common.c */