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path: root/src/plugins/fs/search.c
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/*
     This file is part of GNUnet.
     (C) 2005, 2006, 2007, 2008 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/plugins/fs/search.c
 * @brief code for searching with gnunet-gtk
 * @author Christian Grothoff
 */

#include "platform.h"
#include "gnunetgtk_common.h"
#include "search.h"
#include "status.h"
#include "helper.h"
#include "fs.h"
#include "meta.h"
#include <extractor.h>
#include <GNUnet/gnunet_util_crypto.h>
#include <GNUnet/gnunet_namespace_lib.h>
#ifdef HAVE_GIO
#include <gio/gio.h>
#endif


/**
 * The user has edited the search entry.
 * Update search button status.
 */
static void
on_fssearchSelectionChanged (gpointer signal, gpointer cls)
{
  SearchList *list = cls;
  GtkTreeSelection *selection;
  GtkWidget *downloadButton;

  selection = gtk_tree_view_get_selection (list->treeview);
  downloadButton = glade_xml_get_widget (list->searchXML, "downloadButton");
  gtk_widget_set_sensitive (downloadButton,
                            gtk_tree_selection_count_selected_rows (selection)
                            > 0);
}


/* **************** FSUI event handling ****************** */

/**
 * Update the number of results received in the label of the tab.
 */
static void
updateResultsCount (SearchList * searchContext)
{
  char *new_title;
  GtkLabel *label;

  /* update tab title with the number of results */
  new_title =
    g_strdup_printf ("%.*s%s (%u)",
                     20,
                     searchContext->searchString,
                     strlen (searchContext->searchString) > 20 ? "..." : "",
                     searchContext->resultsReceived);
  label = GTK_LABEL (glade_xml_get_widget (searchContext->labelXML,
                                           "searchTabLabel"));
  gtk_label_set (label, new_title);
  GNUNET_free (new_title);
}

static GdkPixbuf *
make_ranking_pixbuf (int availability_rank,
                     unsigned int availability_certainty,
                     unsigned int applicability_rank, unsigned int kwords)
{
  GdkPixbuf *pixbuf;
  guchar *pixels;
  guchar *pixel;
  int n_channels;
  int rowstride;
  unsigned int x;
  unsigned int y;

#define P_HEIGHT 21
#define P_WIDTH 60
  pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE,    /* alpha */
                           8,   /* bits per sample */
                           P_WIDTH,     /* width */
                           P_HEIGHT     /* height */
    );
  n_channels = gdk_pixbuf_get_n_channels (pixbuf);
  pixels = gdk_pixbuf_get_pixels (pixbuf);
  rowstride = gdk_pixbuf_get_rowstride (pixbuf);
  for (x = 0; x < P_WIDTH; x++)
    for (y = 0; y < P_HEIGHT; y++)
      {
        pixel = pixels + y * rowstride + x * n_channels;
#define PX_RED 0
#define PX_GREEN 1
#define PX_BLUE 2
#define PX_ALPHA 3
        pixel[PX_RED] = 0;
        pixel[PX_GREEN] = 0;
        pixel[PX_BLUE] = 0;
        pixel[PX_ALPHA] = 0;
        if (y < P_HEIGHT / 2)
          {
            /* applicability */
            if (x * kwords < applicability_rank * P_WIDTH)
              {
                pixel[PX_RED] = 0;
                pixel[PX_GREEN] = 0;
                pixel[PX_BLUE] = 255;
                pixel[PX_ALPHA] = 255;
              }
          }
        else if ((y > P_HEIGHT / 2) &&
                 ((y - P_HEIGHT / 2) * GNUNET_FSUI_MAX_PROBES
                  < availability_certainty * P_HEIGHT / 2))
          {
            /* availability */
            if (availability_rank < 0)
              {
                if ((x * GNUNET_FSUI_MAX_PROBES >
                     ((unsigned int) (GNUNET_FSUI_MAX_PROBES +
                                      availability_rank)) * P_WIDTH / 2)
                    && (x <= P_WIDTH / 2))
                  {
                    pixel[PX_RED] = 255;
                    pixel[PX_GREEN] = 0;
                    pixel[PX_BLUE] = 0;
                    pixel[PX_ALPHA] = 255;
                  }
              }
            else if (availability_rank > 0)
              {
                if ((x >= P_WIDTH / 2) &&
                    ((x - (P_WIDTH / 2)) * GNUNET_FSUI_MAX_PROBES <
                     ((unsigned int) availability_rank) * P_WIDTH / 2))
                  {
                    pixel[PX_RED] = 0;
                    pixel[PX_GREEN] = 255;
                    pixel[PX_BLUE] = 0;
                    pixel[PX_ALPHA] = 255;
                  }
              }
            else
              {
                if (x == P_WIDTH / 2)
                  {
                    /* yellow */
                    pixel[PX_RED] = 255;
                    pixel[PX_GREEN] = 255;
                    pixel[PX_BLUE] = 0;
                    pixel[PX_ALPHA] = 255;
                  }
              }
          }
      }
  return pixbuf;
}

/**
 * Add the given search result to the search
 * tree at the specified position.
 */
void
addEntryToSearchTree (SearchList * searchContext,
                      DownloadList * downloadParent,
                      const GNUNET_ECRS_FileInfo * info, GtkTreeIter * iter)
{
  char *name;
  char *rawMime;
  char *mime;
  char *desc;
  unsigned long long size;
  char *size_h;
  GdkPixbuf *pixbuf;
  GdkPixbuf *rankbuf;
#ifdef HAVE_GIO
  GdkPixbuf *icon = NULL;
  GIcon *gicon = NULL;
  const gchar **iconNames;
  int i = 0;
#endif
  enum GNUNET_URITRACK_STATE state;

  state = GNUNET_URITRACK_get_state (ectx, cfg, info->uri);
  rawMime = getMimeTypeFromMetaData (info->meta);
  desc = getDescriptionFromMetaData (info->meta);
  name = getFileNameFromMetaData (info->meta);
  size = GNUNET_ECRS_uri_test_chk (info->uri)
    || GNUNET_ECRS_uri_test_loc (info->uri) ?
    GNUNET_ECRS_uri_get_file_size (info->uri) : 0;
  pixbuf = getThumbnailFromMetaData (info->meta);
  size_h = GNUNET_get_byte_size_as_fancy_string (size);
  rankbuf = make_ranking_pixbuf (0, 0, 1,
                                 GNUNET_ECRS_uri_get_keyword_count_from_ksk
                                 (searchContext->uri));
#ifdef HAVE_GIO
  if (0 == strcmp (rawMime, GNUNET_DIRECTORY_MIME))
    {
      mime = GNUNET_strdup (_("Directory"));
      icon = gtk_icon_theme_load_icon (gtk_icon_theme_get_default (),
                                       GTK_STOCK_DIRECTORY, 16, 0,
                                       (GError **) NULL);
    }
  else
    {
      mime = g_content_type_get_description (rawMime);
      gicon = g_content_type_get_icon (rawMime);
      if (G_IS_THEMED_ICON (gicon))
        {
          iconNames = (const gchar **) g_themed_icon_get_names
            (G_THEMED_ICON (gicon));
          do
            {
              icon = gtk_icon_theme_load_icon (gtk_icon_theme_get_default (),
                                               iconNames[i], 16, 0,
                                               (GError **) NULL);
              i++;
            }
          while ((icon == NULL) && iconNames[i]);
        }
    }
#else
  mime = GNUNET_strdup (rawMime);
#endif

  gtk_tree_store_set (searchContext->tree, iter,
                      SEARCH_NAME, name, SEARCH_SIZE, size, SEARCH_HSIZE,
                      size_h, SEARCH_MIME, mime,
                      SEARCH_RAW_MIME, rawMime, SEARCH_DESC, desc,
                      SEARCH_PIXBUF, pixbuf, SEARCH_URI,
                      GNUNET_ECRS_uri_duplicate (info->uri), SEARCH_META,
                      GNUNET_meta_data_duplicate (info->meta),
                      SEARCH_INTERNAL,searchContext,
                      SEARCH_INTERNAL_PARENT, downloadParent,
                      SEARCH_STATUS, getStatusName (state),
                      SEARCH_STATUS_LOGO, getStatusLogo (state),
                      SEARCH_APPLICABILITY_RANK, 1, SEARCH_RANK_SORT,
                      (long long) 1, SEARCH_RANK_PIXBUF, rankbuf,
#ifdef HAVE_GIO
                      SEARCH_ICON, icon,
#endif
                      -1);
  g_object_unref (rankbuf);
  if (pixbuf != NULL)
    g_object_unref (pixbuf);
#ifdef HAVE_GIO
  if (gicon != NULL)
    g_object_unref (gicon);
  if (icon != NULL)
    g_object_unref (icon);
#endif
  GNUNET_free (size_h);
  GNUNET_free (name);
  GNUNET_free (desc);
  GNUNET_free (rawMime);
  GNUNET_free (mime);
}

/**
 * Add the given result to the model (search result
 * list).
 *
 * @param info the information to add to the model
 * @param uri the search URI
 * @param searchContext identifies the search page
 */
void
fs_search_result_received (SearchList * searchContext,
                           const GNUNET_ECRS_FileInfo * info,
                           const struct GNUNET_ECRS_URI *uri)
{
  GtkTreeStore *model;
  GtkTreeIter iter;
  enum GNUNET_URITRACK_STATE state;
  struct GNUNET_ECRS_URI *have;

  state = GNUNET_URITRACK_get_state (ectx, cfg, info->uri);
  if ((state & (GNUNET_URITRACK_INSERTED |
                GNUNET_URITRACK_INDEXED)) &&
      (GNUNET_YES == GNUNET_GC_get_configuration_value_yesno (cfg,
                                                              "GNUNET-GTK",
                                                              "DISABLE-OWN",
                                                              GNUNET_NO)))
    return;
  model = GTK_TREE_STORE (gtk_tree_view_get_model (searchContext->treeview));
  /* Check that the entry does not already exist (for resume!) */
  if (gtk_tree_model_get_iter_first (GTK_TREE_MODEL (model), &iter))
    {
      do
        {
          have = NULL;
          gtk_tree_model_get (GTK_TREE_MODEL (model),
                              &iter, SEARCH_URI, &have, -1);
          if ((have != NULL) && (GNUNET_ECRS_uri_test_equal (have, uri)))
            return;             /* duplicate */
        }
      while (gtk_tree_model_iter_next (GTK_TREE_MODEL (model), &iter));
    }
  gtk_tree_store_append (model, &iter, NULL);
  addEntryToSearchTree (searchContext, NULL, info, &iter);
  searchContext->resultsReceived++;
  updateResultsCount (searchContext);
}

/**
 * Update the applicability and availability rating
 * for the given search result.
 *
 * @param info the search result (and metadata)
 * @param availability_rank availability estimate
 * @param applicability_rank relevance
 */
void
fs_search_update (SearchList * searchContext,
                  const GNUNET_ECRS_FileInfo * info,
                  int availability_rank,
                  unsigned int availability_certainty,
                  unsigned int applicability_rank)
{
  GtkTreeStore *model;
  GtkTreeIter iter;
  struct GNUNET_ECRS_URI *have;
  GdkPixbuf *pixbuf;
  long long rank;
  unsigned int kwords;

  kwords = GNUNET_ECRS_uri_get_keyword_count_from_ksk (searchContext->uri);
  model = GTK_TREE_STORE (gtk_tree_view_get_model (searchContext->treeview));
  /* find existing entry */
  if (gtk_tree_model_get_iter_first (GTK_TREE_MODEL (model), &iter))
    {
      do
        {
          have = NULL;
          gtk_tree_model_get (GTK_TREE_MODEL (model),
                              &iter, SEARCH_URI, &have, -1);
          if ((have != NULL) &&
              (GNUNET_ECRS_uri_test_equal (have, info->uri)))
            {
              /* gotcha, create pixbuf and rank info! */
              rank =
                (int) applicability_rank +
                (int) (availability_rank * (int) availability_certainty *
                       65536);
              pixbuf =
                make_ranking_pixbuf (availability_rank,
                                     availability_certainty,
                                     applicability_rank, kwords);
              gtk_tree_store_set (searchContext->tree, &iter,
                                  SEARCH_AVAILABILITY_RANK, availability_rank,
                                  SEARCH_AVAILABILITY_CERTAINTY,
                                  availability_certainty,
                                  SEARCH_APPLICABILITY_RANK,
                                  applicability_rank, SEARCH_RANK_PIXBUF,
                                  pixbuf, SEARCH_RANK_SORT, rank, -1);
              g_object_unref (pixbuf);
              return;           /* done! */
            }
        }
      while (gtk_tree_model_iter_next (GTK_TREE_MODEL (model), &iter));
    }
  /* not found!? */
  GNUNET_GE_BREAK (NULL, 0);
}




static int
on_search_display_metadata_activate (void *cls, GtkWidget * searchEntry)
{
  SearchList *list = cls;
  GtkTreePath *path;
  GtkTreeIter iter;
  struct GNUNET_ECRS_URI *uri;
  struct GNUNET_MetaData *meta;
  char *str;
  GladeXML *xml;
  GtkWidget *dialog;

  path = NULL;
  if (FALSE == gtk_tree_view_get_path_at_pos (list->treeview,
                                              list->last_x,
                                              list->last_y,
                                              &path, NULL, NULL, NULL))
    {
      /* nothing selected */
      return FALSE;
    }
  if (FALSE == gtk_tree_model_get_iter (GTK_TREE_MODEL (list->tree),
                                        &iter, path))
    {
      GNUNET_GE_BREAK (NULL, 0);
      gtk_tree_path_free (path);
      return FALSE;
    }
  gtk_tree_path_free (path);
  uri = NULL;
  meta = NULL;
  gtk_tree_model_get (GTK_TREE_MODEL (list->tree),
                      &iter, SEARCH_URI, &uri, SEARCH_META, &meta, -1);
  str = GNUNET_ECRS_uri_to_string (uri);
  xml = glade_xml_new (GNUNET_GTK_get_glade_filename (),
                       "metaDisplayDialog", PACKAGE_NAME);
  GNUNET_GTK_connect_glade_with_plugins (xml);
  dialog = glade_xml_get_widget (xml, "metaDisplayDialog");
  gtk_window_set_title (GTK_WINDOW (dialog), str);
  createMetaDataListTreeView (xml, "metaDisplayDialogTreeView", NULL, meta);
  gtk_dialog_run (GTK_DIALOG (dialog));
  GNUNET_free_non_null (str);
  gtk_widget_destroy (dialog);
  UNREF (xml);
  return FALSE;
}


static int
on_search_copy_uri_activate (void *cls, GtkWidget * searchEntry)
{
  SearchList *list = cls;
  GtkTreePath *path;
  GtkTreeIter iter;
  struct GNUNET_ECRS_URI *uri;
  char *str;
  GtkClipboard *clip;

  path = NULL;
  if (FALSE == gtk_tree_view_get_path_at_pos (list->treeview,
                                              list->last_x,
                                              list->last_y,
                                              &path, NULL, NULL, NULL))
    {
      GNUNET_GE_BREAK (NULL, 0);
      return FALSE;
    }
  if (FALSE == gtk_tree_model_get_iter (GTK_TREE_MODEL (list->tree),
                                        &iter, path))
    {
      GNUNET_GE_BREAK (NULL, 0);
      gtk_tree_path_free (path);
      return FALSE;
    }
  gtk_tree_path_free (path);
  uri = NULL;
  gtk_tree_model_get (GTK_TREE_MODEL (list->tree),
                      &iter, SEARCH_URI, &uri, -1);
  str = GNUNET_ECRS_uri_to_string (uri);
  clip = gtk_clipboard_get (GDK_SELECTION_CLIPBOARD);
  gtk_clipboard_set_text (clip, str, strlen (str));
  GNUNET_free (str);
  return FALSE;
}


#ifndef MINGW
static char *
selectFile ()
{
  GladeXML *uploadXML;
  GtkFileChooser *dialog;
  char *ret;

  uploadXML
    = glade_xml_new (GNUNET_GTK_get_glade_filename (),
                     "directorySaveDialog", PACKAGE_NAME);
  GNUNET_GTK_connect_glade_with_plugins (uploadXML);
  dialog = GTK_FILE_CHOOSER (glade_xml_get_widget (uploadXML,
                                                   "directorySaveDialog"));
  if (gtk_dialog_run (GTK_DIALOG (dialog)) != GTK_RESPONSE_CANCEL)
    ret = gtk_file_chooser_get_filename (dialog);
  else
    ret = NULL;
  gtk_widget_destroy (GTK_WIDGET (dialog));
  UNREF (uploadXML);
  return ret;
}

#else /* MINGW */

static char *
selectFile ()
{
  return
    plibc_ChooseFile (_
                      ("Choose the name under which you want to save the search results."),
                      OFN_SHAREAWARE);
}
#endif /* MINGW */

static int
on_save_search_activate (void *cls, GtkWidget * searchEntry)
{
  SearchList *list = cls;
  char *name;
  char *directory;
  unsigned long long dir_len;
  unsigned int fis_size;
  GNUNET_ECRS_FileInfo *fis;
  struct GNUNET_MetaData *meta;
  GtkTreeModel *model;
  GtkTreeIter iter;
  unsigned int pos;

  model = gtk_tree_view_get_model (list->treeview);
  if (TRUE != gtk_tree_model_get_iter_first (model, &iter))
    {
      GNUNET_GTK_add_log_entry (_("No search results yet, cannot save!"));
      return FALSE;
    }

  name = selectFile ("");
  if (name == NULL)
    return FALSE;
  fis = NULL;
  fis_size = 0;
  GNUNET_array_grow (fis, fis_size, list->resultsReceived);
  pos = 0;
  do
    {
      if (pos == fis_size)
        GNUNET_array_grow (fis, fis_size, pos + 1);
      gtk_tree_model_get (model,
                          &iter,
                          SEARCH_URI, &fis[pos].uri,
                          SEARCH_META, &fis[pos].meta, -1);
      pos++;
    }
  while (gtk_tree_model_iter_next (model, &iter));
  meta = GNUNET_meta_data_create ();
  GNUNET_meta_data_insert (meta, EXTRACTOR_KEYWORDS, list->searchString);
  GNUNET_meta_data_insert (meta, EXTRACTOR_DESCRIPTION,
                           _("Saved search results"));
  GNUNET_meta_data_insert (meta, EXTRACTOR_SOFTWARE, "gnunet-gtk");
  if (GNUNET_OK != GNUNET_ECRS_directory_create (NULL,
                                                 &directory, &dir_len,
                                                 fis_size, fis, meta))
    {
      GNUNET_GTK_add_log_entry (_("Internal error."));
      GNUNET_GE_BREAK (NULL, 0);
      GNUNET_meta_data_destroy (meta);
      GNUNET_array_grow (fis, fis_size, 0);
      GNUNET_free (name);
      return FALSE;
    }
  GNUNET_meta_data_destroy (meta);
  GNUNET_array_grow (fis, fis_size, 0);
  if (GNUNET_OK !=
      GNUNET_disk_file_write (NULL, name, directory, dir_len, "644"))
    {
      GNUNET_GTK_add_log_entry (_("Error writing file `%s'."), name);
    }
  GNUNET_free (directory);
  GNUNET_free (name);
  return FALSE;
}

static gint
search_click_handler (void *cls, GdkEvent * event)
{
  SearchList *list = cls;
  GtkMenu *menu;
  GtkWidget *entry;
  GdkEventButton *event_button;

  if ((event == NULL) || (event->type != GDK_BUTTON_PRESS))
    return FALSE;
  event_button = (GdkEventButton *) event;
  if (event_button->button != 3)
    return FALSE;
  list->last_x = event_button->x;
  list->last_y = event_button->y;
  menu = GTK_MENU (gtk_menu_new ());

  entry = gtk_menu_item_new_with_label (_("_Display metadata"));
  g_signal_connect_swapped (entry,
                            "activate",
                            G_CALLBACK (on_search_display_metadata_activate),
                            list);
  gtk_label_set_use_underline (GTK_LABEL
                               (gtk_bin_get_child (GTK_BIN (entry))), TRUE);
  gtk_widget_show (entry);
  gtk_menu_shell_append (GTK_MENU_SHELL (menu), entry);

  entry = gtk_menu_item_new_with_label (_("_Copy URI to Clipboard"));
  g_signal_connect_swapped (entry,
                            "activate",
                            G_CALLBACK (on_search_copy_uri_activate), list);
  gtk_label_set_use_underline (GTK_LABEL
                               (gtk_bin_get_child (GTK_BIN (entry))), TRUE);
  gtk_widget_show (entry);
  gtk_menu_shell_append (GTK_MENU_SHELL (menu), entry);

  entry = gtk_menu_item_new_with_label (_("_Save results as directory"));
  g_signal_connect_swapped (entry,
                            "activate",
                            G_CALLBACK (on_save_search_activate), list);
  gtk_label_set_use_underline (GTK_LABEL
                               (gtk_bin_get_child (GTK_BIN (entry))), TRUE);
  gtk_widget_show (entry);
  gtk_menu_shell_append (GTK_MENU_SHELL (menu), entry);


  gtk_menu_popup (menu,
                  NULL,
                  NULL, NULL, NULL, event_button->button, event_button->time);
  return TRUE;
}

/**
 * FSUI event: a search was started; create the tab
 */
SearchList *
fs_search_started (struct GNUNET_FSUI_SearchList * fsui_list,
                   const struct GNUNET_ECRS_URI * uri,
                   unsigned int anonymityLevel,
                   unsigned int resultCount,
                   const GNUNET_ECRS_FileInfo * results,
                   GNUNET_FSUI_State state)
{
  SearchList *list;
  gint pages;
  char *description;
  GtkTreeViewColumn *column;
  GtkCellRenderer *renderer;
  GtkNotebook *notebook;
  int col;
  unsigned int i;

  /* check that search does not already exist
     with fsui_list == NULL;
     (and if so, hijack!) */
  list = search_head;
  while (list != NULL)
    {
      if ((list->fsui_list == NULL) &&
          (list->uri != NULL) &&
          (GNUNET_ECRS_uri_test_equal (list->uri, uri)))
        {
          list->fsui_list = fsui_list;
          for (i = 0; i < resultCount; i++)
            fs_search_result_received (list, &results[i], uri);
          if (resultCount == 0) /* otherwise already done! */
            updateResultsCount (list);
          return list;
        }
      list = list->next;
    }

  /* build new entry */
  if (GNUNET_ECRS_uri_test_ksk (uri))
    description = GNUNET_ECRS_ksk_uri_to_human_readable_string (uri);
  else
    description = GNUNET_NS_sks_uri_to_human_readable_string (ectx, cfg, uri);
  if (description == NULL)
    {
      GNUNET_GE_BREAK (ectx, 0);
      return NULL;
    }
  list = GNUNET_malloc (sizeof (SearchList));
  memset (list, 0, sizeof (SearchList));
  list->searchString = description;
  list->uri = GNUNET_ECRS_uri_duplicate (uri);
  list->fsui_list = fsui_list;
  list->next = search_head;
  list->anonymityLevel = anonymityLevel;

  search_head = list;
  list->searchXML
    =
    glade_xml_new (GNUNET_GTK_get_glade_filename (), "searchResultsFrame",
                   PACKAGE_NAME);
  GNUNET_GTK_connect_glade_with_plugins (list->searchXML);
  list->searchpage
    =
    GNUNET_GTK_extract_main_widget_from_window (list->searchXML,
                                                "searchResultsFrame");
  /* setup tree view and renderers */
  list->treeview = GTK_TREE_VIEW (glade_xml_get_widget (list->searchXML,
                                                        "searchResults"));
  g_signal_connect_swapped (list->treeview,
                            "button-press-event",
                            G_CALLBACK (search_click_handler), list);
  list->tree = gtk_tree_store_new (SEARCH_NUM, G_TYPE_STRING,   /* name */
                                   G_TYPE_UINT64,       /* size */
                                   G_TYPE_STRING,       /* human-readable size */
                                   G_TYPE_STRING,       /* mime-type */
                                   G_TYPE_STRING,       /* raw mime-type */
                                   G_TYPE_STRING,       /* meta-data (some) */
                                   GDK_TYPE_PIXBUF,     /* preview */
                                   G_TYPE_POINTER,      /* url */
                                   G_TYPE_POINTER,      /* meta */
                                   G_TYPE_POINTER,      /* internal: search list */
                                   G_TYPE_POINTER,      /* internal: download parent list */
                                   G_TYPE_STRING,       /* status */
                                   GDK_TYPE_PIXBUF,     /* status (icon) */
                                   G_TYPE_INT,  /* availability rank */
                                   G_TYPE_UINT, /* availability certainty */
                                   G_TYPE_UINT, /* applicability rank */
                                   GDK_TYPE_PIXBUF,     /* ranking visualization */
                                   G_TYPE_INT64 /* numeric sort */
#ifdef HAVE_GIO
                                   , GDK_TYPE_PIXBUF    /* icon */
#endif
    );

  gtk_tree_view_set_model (list->treeview, GTK_TREE_MODEL (list->tree));
  gtk_tree_selection_set_mode (gtk_tree_view_get_selection (list->treeview),
                               GTK_SELECTION_MULTIPLE);

  g_signal_connect_data (gtk_tree_view_get_selection (list->treeview),
                         "changed",
                         G_CALLBACK (&on_fssearchSelectionChanged),
                         list, NULL, 0);

  column = gtk_tree_view_column_new ();
  gtk_tree_view_column_set_title (column, _("Name"));
#ifdef HAVE_GIO
  renderer = gtk_cell_renderer_pixbuf_new ();
  gtk_tree_view_column_pack_start (column, renderer, FALSE);
  gtk_tree_view_column_set_attributes (column, renderer, "pixbuf",
                                       SEARCH_ICON, NULL);
#endif
  renderer = gtk_cell_renderer_text_new ();
  gtk_tree_view_column_pack_start (column, renderer, TRUE);
  g_object_set (G_OBJECT (renderer),
                "wrap-width", 45,
                "width-chars", 45, "ellipsize", PANGO_ELLIPSIZE_END, NULL);
  gtk_tree_view_column_set_attributes (column, renderer, "text",
                                       SEARCH_NAME, NULL);
  col = gtk_tree_view_insert_column (list->treeview, column, 0);
  gtk_tree_view_column_set_resizable (column, TRUE);
  gtk_tree_view_column_set_clickable (column, TRUE);
  gtk_tree_view_column_set_reorderable (column, TRUE);
  gtk_tree_view_column_set_sort_column_id (column, SEARCH_NAME);

  renderer = gtk_cell_renderer_pixbuf_new ();
  col = gtk_tree_view_insert_column_with_attributes (list->treeview,
                                                     -1,
                                                     _("Status"),
                                                     renderer,
                                                     "pixbuf", SEARCH_STATUS_LOGO,
                                                     NULL);
  column = gtk_tree_view_get_column (list->treeview, col - 1);
  gtk_tree_view_column_set_resizable (column, TRUE);
  gtk_tree_view_column_set_clickable (column, TRUE);
  gtk_tree_view_column_set_reorderable (column, TRUE);
  gtk_tree_view_column_set_sort_column_id (column, SEARCH_STATUS);
  gtk_tree_view_column_set_min_width (column, 20);

  renderer = gtk_cell_renderer_text_new ();
  g_object_set (renderer, "xalign", 1.00, NULL);
  col = gtk_tree_view_insert_column_with_attributes (list->treeview,
                                                     -1,
                                                     _("Size"),
                                                     renderer,
                                                     "text", SEARCH_HSIZE,
                                                     NULL);
  column = gtk_tree_view_get_column (list->treeview, col - 1);
  gtk_tree_view_column_set_resizable (column, TRUE);
  gtk_tree_view_column_set_clickable (column, TRUE);
  gtk_tree_view_column_set_reorderable (column, TRUE);
  gtk_tree_view_column_set_sort_column_id (column, SEARCH_SIZE);

#if 0
  /* colums for data visualized graphically */
  renderer = gtk_cell_renderer_text_new ();
  gtk_tree_view_insert_column_with_attributes (list->treeview,
                                               -1,
                                               _("Availability"),
                                               renderer,
                                               "text",
                                               SEARCH_AVAILABILITY_RANK,
                                               NULL);
  renderer = gtk_cell_renderer_text_new ();
  gtk_tree_view_insert_column_with_attributes (list->treeview,
                                               -1,
                                               _("Certainty"),
                                               renderer,
                                               "text",
                                               SEARCH_AVAILABILITY_CERTAINTY,
                                               NULL);
  renderer = gtk_cell_renderer_text_new ();
  gtk_tree_view_insert_column_with_attributes (list->treeview,
                                               -1,
                                               _("Applicability"),
                                               renderer,
                                               "text",
                                               SEARCH_APPLICABILITY_RANK,
                                               NULL);
  renderer = gtk_cell_renderer_text_new ();
  gtk_tree_view_insert_column_with_attributes (list->treeview,
                                               -1,
                                               _("Sort"),
                                               renderer,
                                               "text", SEARCH_RANK_SORT,
                                               NULL);
#endif

  renderer = gtk_cell_renderer_pixbuf_new ();
  col = gtk_tree_view_insert_column_with_attributes (list->treeview,
                                                     -1,
                                                     _("Ranking"),
                                                     renderer,
                                                     "pixbuf",
                                                     SEARCH_RANK_PIXBUF,
                                                     NULL);
  column = gtk_tree_view_get_column (list->treeview, col - 1);
  gtk_tree_view_column_set_resizable (column, FALSE);
  gtk_tree_view_column_set_clickable (column, TRUE);
  gtk_tree_view_column_set_reorderable (column, TRUE);
  gtk_tree_view_column_set_sort_column_id (column, SEARCH_RANK_SORT);


  if (GNUNET_YES != GNUNET_GC_get_configuration_value_yesno (cfg,
                                                             "GNUNET-GTK",
                                                             "DISABLE-PREVIEWS",
                                                             GNUNET_NO))
    {
      renderer = gtk_cell_renderer_pixbuf_new ();
      col = gtk_tree_view_insert_column_with_attributes (list->treeview,
                                                         -1,
                                                         _("Preview"),
                                                         renderer,
                                                         "pixbuf",
                                                         SEARCH_PIXBUF, NULL);
      column = gtk_tree_view_get_column (list->treeview, col - 1);
      gtk_tree_view_column_set_resizable (column, TRUE);
      gtk_tree_view_column_set_reorderable (column, TRUE);
      gtk_tree_view_column_set_resizable (column, TRUE);
    }

  renderer = gtk_cell_renderer_text_new ();
  col = gtk_tree_view_insert_column_with_attributes (list->treeview,
                                                     -1,
                                                     _("Meta-data"),
                                                     renderer,
                                                     "text", SEARCH_DESC,
                                                     NULL);
  column = gtk_tree_view_get_column (list->treeview, col - 1);
  g_object_set (G_OBJECT (renderer),
                "wrap-width", 60,
                "width-chars", 60,
                "wrap-mode", PANGO_WRAP_WORD_CHAR,
                "ellipsize", PANGO_ELLIPSIZE_END,
                "ellipsize-set", TRUE, NULL);
  gtk_tree_view_column_set_resizable (column, TRUE);
  gtk_tree_view_column_set_clickable (column, TRUE);
  gtk_tree_view_column_set_reorderable (column, TRUE);
  gtk_tree_view_column_set_sort_column_id (column, SEARCH_DESC);

  /* load label */
  list->labelXML
    = glade_xml_new (GNUNET_GTK_get_glade_filename (),
                     "searchTabLabelWindow", PACKAGE_NAME);
  GNUNET_GTK_connect_glade_with_plugins (list->labelXML);
  list->tab_label
    =
    GNUNET_GTK_extract_main_widget_from_window (list->labelXML,
                                                "searchTabLabelWindow");
  /* process existing results */
  for (i = 0; i < resultCount; i++)
    fs_search_result_received (list, &results[i], uri);
  if (resultCount == 0)         /* otherwise already done! */
    updateResultsCount (list);

  /* insert new page into search notebook */
  notebook
    =
    GTK_NOTEBOOK (glade_xml_get_widget
                  (GNUNET_GTK_get_main_glade_XML (), "downloadNotebook"));
  pages = gtk_notebook_get_n_pages (GTK_NOTEBOOK (notebook));
  gtk_notebook_append_page (notebook, list->searchpage, list->tab_label);
  gtk_notebook_set_current_page (notebook, pages);
  gtk_widget_show (GTK_WIDGET (notebook));      /* may have been hidden! */

  return list;
}

/**
 * Recursively free the (internal) model data fields
 * (uri and meta) from the search tree model.
 */
static void
freeIterSubtree (GtkTreeModel * tree, GtkTreeIter * iter)
{
  GtkTreeIter child;
  struct GNUNET_ECRS_URI *uri;
  struct GNUNET_MetaData *meta;

  do
    {
      uri = NULL;
      meta = NULL;
      gtk_tree_model_get (tree,
                          iter, SEARCH_URI, &uri, SEARCH_META, &meta, -1);
      if (uri != NULL)
        GNUNET_ECRS_uri_destroy (uri);
      if (meta != NULL)
        GNUNET_meta_data_destroy (meta);
      gtk_tree_store_set (GTK_TREE_STORE (tree),
                          iter, SEARCH_URI, NULL, SEARCH_META, NULL, -1);
      if (gtk_tree_model_iter_children (tree, &child, iter))
        freeIterSubtree (tree, &child);
    }
  while (gtk_tree_model_iter_next (tree, iter));
}

/**
 * FSUI event: a search was aborted.
 * Update views accordingly.
 */
void
fs_search_aborted (SearchList * list)
{
  gtk_widget_show (glade_xml_get_widget (list->searchXML,
                                         "searchResumeButton"));
  gtk_widget_show (glade_xml_get_widget (list->searchXML,
                                         "searchPauseButton"));
}

void
fs_search_paused (SearchList * list)
{
  /* nothing to be done */
}

void
fs_search_restarted (SearchList * list)
{
  /* nothing to be done */
}

/**
 * FSUI event: a search was stopped.
 * Remove the respective tab.
 */
void
fs_search_stopped (SearchList * list)
{
  GtkNotebook *notebook;
  SearchList *prev;
  DownloadList *downloads;
  int index;
  int i;

  /* remove from linked list */
  if (search_head == list)
    {
      search_head = search_head->next;
    }
  else
    {
      prev = search_head;
      while (prev->next != list)
        prev = prev->next;
      prev->next = list->next;
    }

  /* remove links from download views */
  downloads = download_head;
  while (downloads != NULL)
    {
      if (downloads->searchList == list)
        {
          gtk_tree_row_reference_free (downloads->searchViewRowReference);
          downloads->searchViewRowReference = NULL;
          downloads->searchList = NULL;
        }
      downloads = downloads->next;
    }

  /* remove page from notebook */
  notebook
    =
    GTK_NOTEBOOK (glade_xml_get_widget
                  (GNUNET_GTK_get_main_glade_XML (), "downloadNotebook"));
  index = -1;
  for (i = gtk_notebook_get_n_pages (notebook) - 1; i >= 0; i--)
    if (list->searchpage == gtk_notebook_get_nth_page (notebook, i))
      index = i;
  GNUNET_GE_BREAK (ectx, index != -1);
  gtk_notebook_remove_page (notebook, index);
  /* free list state itself */
  UNREF (list->searchXML);
  UNREF (list->labelXML);
  GNUNET_free (list->searchString);
  GNUNET_ECRS_uri_destroy (list->uri);
  GNUNET_free (list);
}

/* ****************** User event handling ************* */


/**
 * The user has edited the search entry.
 * Update search button status.
 */
void
on_fssearchKeywordComboBoxEntry_changed_fs (gpointer dummy2,
                                            GtkWidget * searchEntry)
{
  const char *searchString;
  GtkWidget *searchButton;

  searchString = getEntryLineValue (GNUNET_GTK_get_main_glade_XML (),
                                    "fssearchKeywordComboBoxEntry");
  searchButton =
    glade_xml_get_widget (GNUNET_GTK_get_main_glade_XML (), "fssearchbutton");
  gtk_widget_set_sensitive (searchButton, strlen (searchString) > 0);
}

typedef struct
{
  unsigned int anonymity;
  struct GNUNET_ECRS_URI *uri;
} FSSS;

static void *
search_start_helper (void *cls)
{
  FSSS *fsss = cls;
  GNUNET_FSUI_search_start (ctx, fsss->anonymity, fsss->uri);
  return NULL;
}

/**
 * The user has clicked the "SEARCH" button.
 * Initiate a search.
 */
void
on_fssearchbutton_clicked_fs (gpointer dummy2, GtkWidget * searchButton)
{
  FSSS fsss;
  const char *searchString;
  gint pages;
  gint i;
  SearchList *list;
  GtkTreeIter iter;
  GtkComboBox *searchKeywordGtkCB;
  GtkWidget *searchNamespaceGtkCB;
  GtkNotebook *notebook;

  searchString = getEntryLineValue (GNUNET_GTK_get_main_glade_XML (),
                                    "fssearchKeywordComboBoxEntry");
  if ((searchString == NULL) || (strlen (searchString) == 0))
    {
      GNUNET_GE_LOG (ectx,
                     GNUNET_GE_ERROR | GNUNET_GE_USER | GNUNET_GE_IMMEDIATE,
                     _("Need a keyword to search!\n"));
      return;
    }
  /* add the keyword to the list of keywords that have
     been used so far */
  searchKeywordGtkCB
    = GTK_COMBO_BOX (glade_xml_get_widget (GNUNET_GTK_get_main_glade_XML (),
                                           "fssearchKeywordComboBoxEntry"));
  i = gtk_combo_box_get_active (searchKeywordGtkCB);
  if (i == -1)
    {
      GtkListStore *model;

      model = GTK_LIST_STORE (gtk_combo_box_get_model (searchKeywordGtkCB));
      gtk_list_store_prepend (model, &iter);
      gtk_list_store_set (model, &iter, 0, searchString, -1);
    }
  fsss.uri = NULL;
  /* check for namespace search */
  searchNamespaceGtkCB
    =
    glade_xml_get_widget (GNUNET_GTK_get_main_glade_XML (),
                          "searchNamespaceComboBoxEntry");
  if (TRUE ==
      gtk_combo_box_get_active_iter (GTK_COMBO_BOX (searchNamespaceGtkCB),
                                     &iter))
    {
      char *descStr;
      char *nsName;

      nsName = NULL;
      descStr = NULL;
      gtk_tree_model_get (gtk_combo_box_get_model
                          (GTK_COMBO_BOX (searchNamespaceGtkCB)), &iter,
                          NS_SEARCH_DESCRIPTION, &descStr, NS_SEARCH_NAME,
                          &nsName, -1);

      if ((descStr != NULL) && (0 == strcmp (descStr, "")))
        {
          nsName = NULL;
        }
      else
        {
          if ((descStr == NULL) && (nsName != NULL))
            descStr = GNUNET_strdup (nsName);
        }
      if (nsName != NULL)
        {
          char *ustring;
          GNUNET_EncName enc;
          GNUNET_HashCode nsid;

          GNUNET_GE_ASSERT (NULL,
                            GNUNET_OK ==
                            GNUNET_pseudonym_name_to_id (ectx, cfg,
                                                         nsName, &nsid));
          GNUNET_hash_to_enc (&nsid, &enc);

          ustring =
            GNUNET_malloc (strlen (searchString) + sizeof (GNUNET_EncName) +
                           strlen (GNUNET_ECRS_URI_PREFIX) +
                           strlen (GNUNET_ECRS_SUBSPACE_INFIX) + 10);
          strcpy (ustring, GNUNET_ECRS_URI_PREFIX);
          strcat (ustring, GNUNET_ECRS_SUBSPACE_INFIX);
          strcat (ustring, (const char *) &enc);
          strcat (ustring, "/");
          strcat (ustring, searchString);
          fsss.uri = GNUNET_ECRS_string_to_uri (ectx, ustring);
          if (fsss.uri == NULL)
            {
              GNUNET_GE_LOG (ectx,
                             GNUNET_GE_ERROR | GNUNET_GE_BULK |
                             GNUNET_GE_USER,
                             _("Failed to create namespace URI from `%s'.\n"),
                             ustring);
            }
          GNUNET_free (ustring);
        }
      if (descStr != NULL)
        free (descStr);
      if (nsName != NULL)
        free (nsName);
    }
  if (fsss.uri == NULL)
    fsss.uri = GNUNET_ECRS_keyword_string_to_uri (ectx, searchString);
  if (fsss.uri == NULL)
    {
      GNUNET_GE_BREAK (ectx, 0);
      return;
    }
  /* check if search is already running */
  notebook
    =
    GTK_NOTEBOOK (glade_xml_get_widget
                  (GNUNET_GTK_get_main_glade_XML (), "downloadNotebook"));
  pages = gtk_notebook_get_n_pages (notebook);
  list = search_head;
  while (list != NULL)
    {
      if (GNUNET_ECRS_uri_test_equal (list->uri, fsss.uri))
        {
          for (i = 0; i < pages; i++)
            {
              if (gtk_notebook_get_nth_page (notebook, i) == list->searchpage)
                {
                  gtk_notebook_set_current_page (notebook, i);
                  GNUNET_ECRS_uri_destroy (fsss.uri);
                  return;
                }
            }
          GNUNET_GE_BREAK (ectx, 0);
        }
      list = list->next;
    }
  fsss.anonymity = getSpinButtonValue (GNUNET_GTK_get_main_glade_XML (),
                                       "searchAnonymitySelectionSpinButton");
  GNUNET_GTK_run_with_save_calls (search_start_helper, &fsss);
  GNUNET_ECRS_uri_destroy (fsss.uri);
}

struct FCBC
{
  int (*method) (struct GNUNET_FSUI_SearchList * list);
  struct GNUNET_FSUI_SearchList *argument;
};

static void *
fsui_callback (void *cls)
{
  struct FCBC *fcbc = cls;
  fcbc->method (fcbc->argument);
  return NULL;
}

/**
 * This method is called when the user clicks on either
 * the "CLOSE" button (at the bottom of the search page)
 * or on the "CANCEL (X)" button in the TAB of the
 * search notebook.  Note that "searchPage" can thus
 * either refer to the main page in the tab or to the
 * main entry of the tab label.
 */
void
on_closeSearchButton_clicked_fs (GtkWidget * searchPage,
                                 GtkWidget * closeButton)
{
  SearchList *list;
  struct FCBC fcbc;

  list = search_head;
  while (list != NULL)
    {
      if ((list->searchpage == searchPage) || (list->tab_label == searchPage))
        break;
      list = list->next;
    }
  GNUNET_GE_ASSERT (ectx, list != NULL);
  if (list->fsui_list == NULL)
    {
      /* open directory or paused search;
         close directly */
      fs_search_stopped (list);
    }
  else
    {
      /* actual search - close via FSUI */
      fcbc.method = &GNUNET_FSUI_search_abort;
      fcbc.argument = list->fsui_list;
      GNUNET_GTK_run_with_save_calls (&fsui_callback, &fcbc);
      fcbc.method = &GNUNET_FSUI_search_stop;
      GNUNET_GTK_run_with_save_calls (&fsui_callback, &fcbc);
    }
}


/**
 * The pause button in a search results tab was clicked.
 */
void
on_searchPauseButton_clicked_fs (GtkWidget * searchPage,
                                 GtkWidget * pauseButton)
{
  SearchList *list;
  struct FCBC fcbc;

  list = search_head;
  while (list != NULL)
    {
      if (list->searchpage == searchPage)
        break;
      list = list->next;
    }
  GNUNET_GE_ASSERT (ectx, list != NULL);
  gtk_widget_hide (pauseButton);
  gtk_widget_show (glade_xml_get_widget (list->searchXML,
                                         "searchResumeButton"));
  if (list->fsui_list != NULL)
    {
      fcbc.method = &GNUNET_FSUI_search_pause;
      fcbc.argument = list->fsui_list;
      GNUNET_GTK_run_with_save_calls (&fsui_callback, &fcbc);
    }
}

/**
 * The resume button in a search results tab was clicked.
 */
void
on_searchResumeButton_clicked_fs (GtkWidget * searchPage,
                                  GtkWidget * resumeButton)
{
  SearchList *list;
  struct FCBC fcbc;

  list = search_head;
  while (list != NULL)
    {
      if (list->searchpage == searchPage)
        break;
      list = list->next;
    }
  GNUNET_GE_ASSERT (ectx, list != NULL);
  gtk_widget_hide (resumeButton);
  gtk_widget_show (glade_xml_get_widget (list->searchXML,
                                         "searchPauseButton"));
  if (list->fsui_list != NULL)
    {
      fcbc.method = &GNUNET_FSUI_search_restart;
      fcbc.argument = list->fsui_list;
      GNUNET_GTK_run_with_save_calls (&fsui_callback, &fcbc);
    }
}

/* end of search.c */