/*
    This file is part of darktable,
    Copyright (C) 2010-2024 darktable developers.

    darktable 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 3 of the License, or
    (at your option) any later version.

    darktable 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 darktable.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "bauhaus/bauhaus.h"
#include "common/collection.h"
#include "common/darktable.h"
#include "common/debug.h"
#include "common/image_cache.h"
#include "common/ratings.h"
#include "common/colorlabels.h"
#include "common/grouping.h"
#include "common/undo.h"
#include "common/metadata.h"
#include "common/tags.h"
#include "control/control.h"
#include "control/jobs.h"
#include "control/jobs/control_jobs.h"
#include "dtgtk/button.h"
#include "dtgtk/paint.h"
#include "gui/accelerators.h"
#include "gui/gtk.h"
#include "libs/lib.h"
#include <gdk/gdkkeysyms.h>
#include <gtk/gtk.h>
#include <stdlib.h>
#ifdef USE_LUA
#include "lua/call.h"
#include "lua/image.h"
#endif
#include "libs/lib_api.h"

DT_MODULE(1)

typedef struct dt_lib_image_t
{
  GtkWidget *rotate_cw_button, *rotate_ccw_button, *remove_button;
  GtkWidget *delete_button, *create_hdr_button;
  GtkWidget *duplicate_button, *reset_button, *move_button, *copy_button;
  GtkWidget *group_button, *ungroup_button, *cache_button, *uncache_button;
  GtkWidget *refresh_button, *set_monochrome_button, *set_color_button;
  GtkWidget *copy_metadata_button, *paste_metadata_button, *clear_metadata_button;
  GtkWidget *rating_flag, *colors_flag, *metadata_flag, *geotags_flag, *tags_flag;
  GtkWidget *page1; // saved here for lua extensions
  dt_imgid_t imageid;
} dt_lib_image_t;

typedef enum dt_lib_metadata_id
{
  DT_LIB_META_NONE = 0,
  DT_LIB_META_RATING = 1 << 0,
  DT_LIB_META_COLORS = 1 << 1,
  DT_LIB_META_METADATA = 1 << 2,
  DT_LIB_META_GEOTAG = 1 << 3,
  DT_LIB_META_TAG = 1 << 4
} dt_lib_metadata_id;

const char *name(dt_lib_module_t *self)
{
  return _("actions on selection");
}

dt_view_type_flags_t views(dt_lib_module_t *self)
{
  return DT_VIEW_LIGHTTABLE;
}

uint32_t container(dt_lib_module_t *self)
{
  return DT_UI_CONTAINER_PANEL_RIGHT_CENTER;
}

/** merges all the selected images into a single group.  if there is
 * an expanded group and grouping is on, then they will be joined there, otherwise a new
 * one will be created. */
static void _group_helper_function(void)
{
  dt_imgid_t new_group_id = darktable.gui->grouping
  ? darktable.gui->expanded_group_id 
  : NO_IMGID;

  GList *imgs = NULL;
  sqlite3_stmt *stmt;
  DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                              "SELECT imgid FROM main.selected_images", -1,
                              &stmt, NULL);
  while(sqlite3_step(stmt) == SQLITE_ROW)
  {
    dt_imgid_t id = sqlite3_column_int(stmt, 0);
    if(!dt_is_valid_imgid(new_group_id))
      new_group_id = id;
    dt_grouping_add_to_group(new_group_id, id);
    imgs = g_list_prepend(imgs, GINT_TO_POINTER(id));
  }
  imgs = g_list_reverse(imgs); // list was built in reverse order, so un-reverse it
  sqlite3_finalize(stmt);
  if(darktable.gui->grouping)
    darktable.gui->expanded_group_id = new_group_id;
  else
    darktable.gui->expanded_group_id = NO_IMGID;
  dt_collection_update_query(darktable.collection,
                             DT_COLLECTION_CHANGE_RELOAD,
                             DT_COLLECTION_PROP_UNDEF,
                             imgs);
  dt_control_queue_redraw_center();
}

/** removes the selected images from their current group. */
static void _ungroup_helper_function(void)
{
  GList *imgs = NULL;
  sqlite3_stmt *stmt;
  DT_DEBUG_SQLITE3_PREPARE_V2(dt_database_get(darktable.db),
                              "SELECT imgid FROM main.selected_images", -1,
                              &stmt, NULL);
  while(sqlite3_step(stmt) == SQLITE_ROW)
  {
    const int id = sqlite3_column_int(stmt, 0);
    const int new_group_id = dt_grouping_remove_from_group(id);
    if(dt_is_valid_imgid(new_group_id))
    {
      // new_!dt_is_valid_imgid(group_id) if image to be ungrouped was
      // a single image and no change to any group was made
      imgs = g_list_prepend(imgs, GINT_TO_POINTER(id));
    }
  }
  sqlite3_finalize(stmt);
  if(imgs != NULL)
  {
    darktable.gui->expanded_group_id = NO_IMGID;
    dt_collection_update_query(darktable.collection,
                               DT_COLLECTION_CHANGE_RELOAD,
                               DT_COLLECTION_PROP_UNDEF,
                               g_list_reverse(imgs));
    dt_control_queue_redraw_center();
  }
}

static void _duplicate_virgin(dt_action_t *action)
{
  dt_control_duplicate_images(TRUE);
}

static void button_clicked(GtkWidget *widget, gpointer user_data)
{
  const int i = GPOINTER_TO_INT(user_data);
  if(i == 0)
    dt_control_remove_images();
  else if(i == 1)
    dt_control_delete_images();
  // else if(i == 2) dt_control_write_sidecar_files();
  else if(i == 3)
    dt_control_duplicate_images(FALSE);
  else if(i == 4)
    dt_control_flip_images(1);
  else if(i == 5)
    dt_control_flip_images(0);
  else if(i == 6)
    dt_control_flip_images(2);
  else if(i == 7)
    dt_control_merge_hdr();
  else if(i == 8)
    dt_control_move_images();
  else if(i == 9)
    dt_control_copy_images();
  else if(i == 10)
    _group_helper_function();
  else if(i == 11)
    _ungroup_helper_function();
  else if(i == 12)
    dt_control_set_local_copy_images();
  else if(i == 13)
    dt_control_reset_local_copy_images();
  else if(i == 14)
    dt_control_refresh_exif();
}

void gui_update(dt_lib_module_t *self)
{
  dt_lib_image_t *d = self->data;
  const int nbimgs = dt_act_on_get_images_nb(FALSE, FALSE);

  const gboolean act_on_any = (nbimgs > 0);
  const gboolean act_on_one = (nbimgs == 1);
  const gboolean act_on_mult = (nbimgs > 1);
  const uint32_t selected_cnt = dt_collection_get_selected_count();
  const gboolean can_paste =
    dt_is_valid_imgid(d->imageid)
    && (act_on_mult || (act_on_one && (d->imageid != dt_act_on_get_main_image())));

  gtk_widget_set_sensitive(GTK_WIDGET(d->remove_button), act_on_any);
  gtk_widget_set_sensitive(GTK_WIDGET(d->delete_button), act_on_any);

  gtk_widget_set_sensitive(GTK_WIDGET(d->move_button), act_on_any);
  gtk_widget_set_sensitive(GTK_WIDGET(d->copy_button), act_on_any);

  gtk_widget_set_sensitive(GTK_WIDGET(d->create_hdr_button), act_on_any);
  gtk_widget_set_sensitive(GTK_WIDGET(d->duplicate_button), act_on_any);

  gtk_widget_set_sensitive(GTK_WIDGET(d->rotate_ccw_button), act_on_any);
  gtk_widget_set_sensitive(GTK_WIDGET(d->rotate_cw_button), act_on_any);
  gtk_widget_set_sensitive(GTK_WIDGET(d->reset_button), act_on_any);

  gtk_widget_set_sensitive(GTK_WIDGET(d->cache_button), act_on_any);
  gtk_widget_set_sensitive(GTK_WIDGET(d->uncache_button), act_on_any);

  gtk_widget_set_sensitive(GTK_WIDGET(d->group_button), selected_cnt > 1);

  gtk_widget_set_sensitive(GTK_WIDGET(d->copy_metadata_button), act_on_one);
  gtk_widget_set_sensitive(GTK_WIDGET(d->paste_metadata_button), can_paste);
  gtk_widget_set_sensitive(GTK_WIDGET(d->clear_metadata_button), act_on_any);

  gtk_widget_set_sensitive(GTK_WIDGET(d->refresh_button), act_on_any);
  if(act_on_mult)
  {
    gtk_widget_set_sensitive(GTK_WIDGET(d->ungroup_button), TRUE);
    gtk_widget_set_sensitive(GTK_WIDGET(d->set_monochrome_button), TRUE);
    gtk_widget_set_sensitive(GTK_WIDGET(d->set_color_button), TRUE);
  }
  else if(!act_on_any)
  {
    // no images to act on!
    gtk_widget_set_sensitive(GTK_WIDGET(d->ungroup_button), FALSE);
    gtk_widget_set_sensitive(GTK_WIDGET(d->set_monochrome_button), FALSE);
    gtk_widget_set_sensitive(GTK_WIDGET(d->set_color_button), FALSE);
  }
  else
  {
    // exact one image to act on
    const dt_imgid_t imgid = dt_act_on_get_main_image();
    if(dt_is_valid_imgid(imgid))
    {
      dt_image_t *img = dt_image_cache_get(imgid, 'r');
      const gboolean is_bw = (dt_image_monochrome_flags(img) != 0);
      const int img_group_id = img->group_id;
      dt_image_cache_read_release(img);
      gtk_widget_set_sensitive(GTK_WIDGET(d->set_monochrome_button), !is_bw);
      gtk_widget_set_sensitive(GTK_WIDGET(d->set_color_button), is_bw);
      const int images_in_grp = dt_grouping_count_others(img_group_id, imgid);
      gtk_widget_set_sensitive(GTK_WIDGET(d->ungroup_button), images_in_grp > 0);
    }
    else
    {
      gtk_widget_set_sensitive(GTK_WIDGET(d->set_monochrome_button), FALSE);
      gtk_widget_set_sensitive(GTK_WIDGET(d->set_color_button), FALSE);
      gtk_widget_set_sensitive(GTK_WIDGET(d->ungroup_button), FALSE);
    }
  }
}

static void _image_selection_changed_callback(gpointer instance,
                                              dt_lib_module_t *self)
{
  dt_lib_gui_queue_update(self);
}

static void _collection_updated_callback(gpointer instance,
                                         dt_collection_change_t query_change,
                                         dt_collection_properties_t changed_property,
                                         gpointer imgs,
                                         const int next,
                                         dt_lib_module_t *self)
{
  dt_lib_gui_queue_update(self);
}

static void _mouse_over_image_callback(gpointer instance,
                                       dt_lib_module_t *self)
{
  dt_lib_gui_queue_update(self);
}

static void _image_preference_changed(gpointer instance,
                                      dt_lib_module_t *self)
{
  dt_lib_image_t *d = self->data;
  gboolean trash = dt_conf_get_bool("send_to_trash");
  gtk_label_set_text(GTK_LABEL(gtk_bin_get_child(GTK_BIN(d->delete_button))),
                     trash ? _("delete (trash)")
                           : _("delete"));
  gtk_widget_set_tooltip_text(d->delete_button,
                     trash ? _("physically delete from disk (using trash if possible)")
                           : _("physically delete from disk immediately"));
}

int position(const dt_lib_module_t *self)
{
  return 700;
}

typedef enum dt_metadata_actions_t
{
  DT_MA_REPLACE = 0,
  DT_MA_MERGE,
  DT_MA_CLEAR
} dt_metadata_actions_t;


static void _execute_metadata(dt_lib_module_t *self, const int action)
{
  dt_lib_image_t *d = self->data;
  const gboolean rating_flag = dt_conf_get_bool("plugins/lighttable/copy_metadata/rating");
  const gboolean colors_flag = dt_conf_get_bool("plugins/lighttable/copy_metadata/colors");
  const gboolean dtmetadata_flag = dt_conf_get_bool("plugins/lighttable/copy_metadata/metadata");
  const gboolean geotag_flag = dt_conf_get_bool("plugins/lighttable/copy_metadata/geotags");
  const gboolean dttag_flag = dt_conf_get_bool("plugins/lighttable/copy_metadata/tags");
  const dt_imgid_t imageid = d->imageid;
  GList *imgs = dt_act_on_get_images(FALSE, TRUE, FALSE);
  if(imgs)
  {
    gboolean show_busy = !g_list_shorter_than(imgs,10);
    if(show_busy)
      dt_gui_cursor_set_busy();
    // for all the above actions, we don't use the grpu_on tag, as
    // grouped images have already been added to image list
    const dt_undo_type_t undo_type =
        (rating_flag     ? DT_UNDO_RATINGS     : 0)
      | (colors_flag     ? DT_UNDO_COLORLABELS : 0)
      | (dtmetadata_flag ? DT_UNDO_METADATA    : 0)
      | (geotag_flag     ? DT_UNDO_GEOTAG      : 0)
      | (dttag_flag      ? DT_UNDO_TAGS        : 0);

    if(undo_type) dt_undo_start_group(darktable.undo, undo_type);

    if(rating_flag)
    {
      const int stars = (action == DT_MA_CLEAR) ? 0 : dt_ratings_get(imageid);
      dt_ratings_apply_on_list(imgs, stars, TRUE);
    }
    if(colors_flag)
    {
      const int colors = (action == DT_MA_CLEAR) ? 0 : dt_colorlabels_get_labels(imageid);
      dt_colorlabels_set_labels(imgs, colors, action != DT_MA_MERGE, TRUE);
    }
    if(dtmetadata_flag)
    {
      GList *metadata = (action == DT_MA_CLEAR) ? NULL : dt_metadata_get_list_id(imageid);
      dt_metadata_set_list_id(imgs, metadata, action != DT_MA_MERGE, TRUE);
      DT_CONTROL_SIGNAL_RAISE(DT_SIGNAL_MOUSE_OVER_IMAGE_CHANGE);
      g_list_free_full(metadata, g_free);
    }
    if(geotag_flag)
    {
      dt_image_geoloc_t *geoloc = malloc(sizeof(dt_image_geoloc_t));
      if(action == DT_MA_CLEAR)
        geoloc->longitude = geoloc->latitude = geoloc->elevation = NAN;
      else
        dt_image_get_location(imageid, geoloc);
      dt_image_set_locations(imgs, geoloc, TRUE);
      DT_CONTROL_SIGNAL_RAISE(DT_SIGNAL_GEOTAG_CHANGED,
                              g_list_copy((GList *)imgs), 0);
      g_free(geoloc);
    }
    if(dttag_flag)
    {
      // affect only user tags (not dt tags)
      GList *tags = (action == DT_MA_CLEAR) ? NULL : dt_tag_get_tags(imageid, TRUE);
      if(dt_tag_set_tags(tags, imgs, TRUE, action != DT_MA_MERGE, TRUE))
        DT_CONTROL_SIGNAL_RAISE(DT_SIGNAL_TAG_CHANGED);
      g_list_free(tags);
    }

    if(undo_type)
    {
      dt_undo_end_group(darktable.undo);
      dt_image_synch_xmps(imgs);
      dt_collection_update_query(darktable.collection,
                                 DT_COLLECTION_CHANGE_RELOAD, DT_COLLECTION_PROP_METADATA,
                                 imgs);
      dt_control_queue_redraw_center();
    }
    else
    {
      g_list_free(imgs);
    }
    if(show_busy)
      dt_gui_cursor_clear_busy();
  }
}

static void _copy_metadata_callback(GtkWidget *widget,
                                    dt_lib_module_t *self)
{
  dt_lib_image_t *d = self->data;

  d->imageid = dt_act_on_get_main_image();

  dt_lib_gui_queue_update(self);
}

static void _paste_metadata_callback(GtkWidget *widget,
                                     dt_lib_module_t *self)
{
  const int mode = dt_conf_get_int("plugins/lighttable/copy_metadata/pastemode");
  _execute_metadata(self, mode == 0 ? DT_MA_MERGE : DT_MA_REPLACE);
}

static void _clear_metadata_callback(GtkWidget *widget,
                                     dt_lib_module_t *self)
{
  _execute_metadata(self, DT_MA_CLEAR);
}

static void _set_monochrome_callback(GtkWidget *widget,
                                     dt_lib_module_t *self)
{
  dt_control_monochrome_images(2);
}

static void _set_color_callback(GtkWidget *widget,
                                dt_lib_module_t *self)
{
  dt_control_monochrome_images(0);
}

static void _rating_flag_callback(GtkWidget *widget,
                                  dt_lib_module_t *self)
{
  dt_lib_image_t *d = self->data;
  const gboolean flag = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(d->rating_flag));
  dt_conf_set_bool("plugins/lighttable/copy_metadata/rating", flag);
}

static void _colors_flag_callback(GtkWidget *widget,
                                  dt_lib_module_t *self)
{
  dt_lib_image_t *d = self->data;
  const gboolean flag = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(d->colors_flag));
  dt_conf_set_bool("plugins/lighttable/copy_metadata/colors", flag);
}

static void _metadata_flag_callback(GtkWidget *widget,
                                    dt_lib_module_t *self)
{
  dt_lib_image_t *d = self->data;
  const gboolean flag = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(d->metadata_flag));
  dt_conf_set_bool("plugins/lighttable/copy_metadata/metadata", flag);
}

static void _geotags_flag_callback(GtkWidget *widget,
                                   dt_lib_module_t *self)
{
  dt_lib_image_t *d = self->data;
  const gboolean flag = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(d->geotags_flag));
  dt_conf_set_bool("plugins/lighttable/copy_metadata/geotags", flag);
}

static void _tags_flag_callback(GtkWidget *widget,
                                dt_lib_module_t *self)
{
  dt_lib_image_t *d = self->data;
  const gboolean flag = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(d->tags_flag));
  dt_conf_set_bool("plugins/lighttable/copy_metadata/tags", flag);
}

static void _pastemode_combobox_changed(GtkWidget *widget,
                                        gpointer user_data)
{
  const int mode = dt_bauhaus_combobox_get(widget);
  dt_conf_set_int("plugins/lighttable/copy_metadata/pastemode", mode);
}

#define ellipsize_button(button) gtk_label_set_ellipsize(GTK_LABEL(gtk_bin_get_child(GTK_BIN(button))), PANGO_ELLIPSIZE_END);

void gui_init(dt_lib_module_t *self)
{
  dt_lib_image_t *d = malloc(sizeof(dt_lib_image_t));
  self->data = (void *)d;

  static struct dt_action_def_t notebook_def = { };
  self->widget = GTK_WIDGET(dt_ui_notebook_new(&notebook_def));
  dt_action_define(DT_ACTION(self), NULL, N_("page"),
                   GTK_WIDGET(self->widget), &notebook_def);
  dt_gui_add_help_link(self->widget, "image");

  GtkWidget *page1 = dt_ui_notebook_page(GTK_NOTEBOOK(self->widget), N_("images"), NULL);
  GtkWidget *page2 = dt_ui_notebook_page(GTK_NOTEBOOK(self->widget), N_("metadata"), NULL);

  // images operations
  d->page1 = gtk_grid_new();

  GtkGrid *grid = GTK_GRID(d->page1);
  gtk_container_add(GTK_CONTAINER(page1), d->page1);
  gtk_grid_set_column_homogeneous(grid, TRUE);
  int line = 0;

  d->remove_button = dt_action_button_new
    (self, N_("remove"), button_clicked,
     GINT_TO_POINTER(0),
     _("remove images from the image library, without deleting"),
     GDK_KEY_Delete, 0);
  gtk_grid_attach(grid, d->remove_button, 0, line, 2, 1);

  // delete button label and tooltip will be updated based on trash pref
  d->delete_button = dt_action_button_new(self, N_("delete"), button_clicked,
                                          GINT_TO_POINTER(1), NULL, 0, 0);
  gtk_grid_attach(grid, d->delete_button, 2, line++, 2, 1);

  d->move_button = dt_action_button_new(self, N_("move..."), button_clicked,
                                        GINT_TO_POINTER(8),
                                        _("move to other folder"), 0, 0);
  gtk_grid_attach(grid, d->move_button, 0, line, 2, 1);

  d->copy_button = dt_action_button_new(self, N_("copy..."), button_clicked,
                                        GINT_TO_POINTER(9),
                                        _("copy to other folder"), 0, 0);
  gtk_grid_attach(grid, d->copy_button, 2, line++, 2, 1);

  d->create_hdr_button = dt_action_button_new
    (self, N_("create HDR"), button_clicked,
     GINT_TO_POINTER(7),
     _("create a high dynamic range image from selected shots"), 0, 0);
  gtk_grid_attach(grid, d->create_hdr_button, 0, line, 2, 1);

  d->duplicate_button = dt_action_button_new
    (self, N_("duplicate"), button_clicked, GINT_TO_POINTER(3),
     _("add a duplicate to the image library, including its history stack"),
     GDK_KEY_d, GDK_CONTROL_MASK);
  gtk_grid_attach(grid, d->duplicate_button, 2, line++, 2, 1);

  d->rotate_ccw_button = dtgtk_button_new_full(dtgtk_cairo_paint_refresh, CPF_NONE, NULL,
      &(dtgtk_button_config_t){
        .tooltip = _("rotate selected images 90 degrees CCW"),
        .action = DT_ACTION(self),
        .action_label = N_("rotate selected images 90 degrees CCW"),
        .action_def = &dt_action_def_button,
        .clicked_cb = G_CALLBACK(button_clicked),
        .clicked_data = GINT_TO_POINTER(4),
      });
  gtk_widget_set_name(d->rotate_ccw_button, "non-flat");
  gtk_grid_attach(grid, d->rotate_ccw_button, 0, line, 1, 1);

  d->rotate_cw_button = dtgtk_button_new_full(dtgtk_cairo_paint_refresh, 1 | CPF_NONE, NULL,
      &(dtgtk_button_config_t){
        .tooltip = _("rotate selected images 90 degrees CW"),
        .action = DT_ACTION(self),
        .action_label = N_("rotate selected images 90 degrees CW"),
        .action_def = &dt_action_def_button,
        .clicked_cb = G_CALLBACK(button_clicked),
        .clicked_data = GINT_TO_POINTER(5),
      });
  gtk_widget_set_name(d->rotate_cw_button, "non-flat");
  gtk_grid_attach(grid, d->rotate_cw_button, 1, line, 1, 1);

  d->reset_button = dt_action_button_new(self, N_("reset rotation"),
                                         button_clicked, GINT_TO_POINTER(6),
                                         _("reset rotation to EXIF data"), 0, 0);
  gtk_grid_attach(grid, d->reset_button, 2, line++, 2, 1);

  d->cache_button = dt_action_button_new(self, N_("copy locally"),
                                         button_clicked, GINT_TO_POINTER(12),
                                         _("copy the image locally"), 0, 0);
  gtk_grid_attach(grid, d->cache_button, 0, line, 2, 1);

  d->uncache_button = dt_action_button_new
    (self, N_("resync local copy"),
     button_clicked, GINT_TO_POINTER(13),
     _("synchronize the image's XMP and remove the local copy"), 0, 0);
  gtk_grid_attach(grid, d->uncache_button, 2, line++, 2, 1);

  d->group_button = dt_action_button_new
    (self, NC_("selected images action", "group"),
     button_clicked, GINT_TO_POINTER(10),
     _("add selected images to expanded group or create a new one"),
     GDK_KEY_g, GDK_CONTROL_MASK);
  gtk_grid_attach(grid, d->group_button, 0, line, 2, 1);

  d->ungroup_button = dt_action_button_new(self, N_("ungroup"),
                                           button_clicked, GINT_TO_POINTER(11),
                                           _("remove selected images from the group"),
                                           GDK_KEY_g, GDK_CONTROL_MASK | GDK_SHIFT_MASK);
  gtk_grid_attach(grid, d->ungroup_button, 2, line++, 2, 1);

  // metadata operations
  grid = GTK_GRID(gtk_grid_new());
  gtk_container_add(GTK_CONTAINER(page2), GTK_WIDGET(grid));
  gtk_grid_set_column_homogeneous(grid, TRUE);

  dt_lib_module_t *meta = (dt_lib_module_t *)dt_action_section(DT_ACTION(self),
                                                               N_("metadata"));
  line = -1;
#define META_FLAG_BUTTON(label, item, left, tooltip) {            \
  GtkWidget *flag = gtk_check_button_new_with_label(_(label));    \
  d->item##_flag = flag;                                          \
  gtk_widget_set_tooltip_text(flag, tooltip);                     \
  ellipsize_button(flag);                                         \
  gtk_grid_attach(grid, flag, left, !left ? ++line : line, 3, 1); \
  gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(flag),           \
    dt_conf_get_bool("plugins/lighttable/copy_metadata/" #item)); \
  dt_action_define(DT_ACTION(meta), N_("flags"),                  \
                   label, flag, &dt_action_def_toggle);           \
  g_signal_connect(G_OBJECT(flag), "clicked",                     \
                   G_CALLBACK(_##item##_flag_callback), self); }

  META_FLAG_BUTTON(N_("ratings"),  rating,   0, _("select ratings metadata"));
  META_FLAG_BUTTON(N_("colors"),   colors,   3, _("select colors metadata"));
  META_FLAG_BUTTON(N_("tags"),     tags,     0, _("select tags metadata"));
  META_FLAG_BUTTON(N_("geo tags"), geotags,  3, _("select geo tags metadata"));
  META_FLAG_BUTTON(N_("metadata"), metadata, 0, _("select darktable metadata (from metadata editor module)"));

  d->copy_metadata_button = dt_action_button_new
    (meta, N_("copy"),
     _copy_metadata_callback, self,
     _("set the selected image as source of metadata"), 0, 0);
  gtk_grid_attach(grid, d->copy_metadata_button, 0, ++line, 2, 1);
  g_signal_connect(G_OBJECT(d->copy_metadata_button), "clicked",
                   G_CALLBACK(_copy_metadata_callback), self);

  d->paste_metadata_button = dt_action_button_new
    (meta, N_("paste"), _paste_metadata_callback, self,
     _("paste selected metadata on selected images"), 0, 0);
  gtk_grid_attach(grid, d->paste_metadata_button, 2, line, 2, 1);

  d->clear_metadata_button = dt_action_button_new
    (meta, N_("clear"), _clear_metadata_callback, self,
     _("clear selected metadata on selected images"), 0, 0);
  gtk_grid_attach(grid, d->clear_metadata_button, 4, line++, 2, 1);

  GtkWidget *pastemode = NULL;
  DT_BAUHAUS_COMBOBOX_NEW_FULL
    (pastemode, meta, NULL, N_("mode"),
     _("how to handle existing metadata"),
     dt_conf_get_int("plugins/lighttable/copy_metadata/pastemode"),
     _pastemode_combobox_changed, self,
     N_("merge"), N_("overwrite"));
  gtk_grid_attach(grid, pastemode, 0, line++, 6, 1);

  d->refresh_button = dt_action_button_new
    (meta, N_("refresh EXIF"), button_clicked, GINT_TO_POINTER(14),
     _("update all image information to match changes to file\n"
       "warning: resets star ratings unless you select\n"
       "'ignore EXIF rating' in the 'import' module"), 0, 0);
  gtk_grid_attach(grid, d->refresh_button, 0, line++, 6, 1);

  d->set_monochrome_button = dt_action_button_new
    (meta, N_("monochrome"), _set_monochrome_callback, self,
     _("set selection as monochrome images and activate monochrome workflow"), 0, 0);
  gtk_grid_attach(grid, d->set_monochrome_button, 0, line, 3, 1);

  d->set_color_button = dt_action_button_new(meta, N_("color"), _set_color_callback, self,
                                             _("set selection as color images"), 0, 0);
  gtk_grid_attach(grid, d->set_color_button, 3, line++, 3, 1);

  DT_CONTROL_SIGNAL_HANDLE(DT_SIGNAL_PREFERENCES_CHANGE, _image_preference_changed);
  DT_CONTROL_SIGNAL_HANDLE(DT_SIGNAL_SELECTION_CHANGED, _image_selection_changed_callback);
  DT_CONTROL_SIGNAL_HANDLE(DT_SIGNAL_MOUSE_OVER_IMAGE_CHANGE, _mouse_over_image_callback);
  DT_CONTROL_SIGNAL_HANDLE(DT_SIGNAL_COLLECTION_CHANGED, _collection_updated_callback);

  dt_action_register(DT_ACTION(self), N_("duplicate virgin"),
                     _duplicate_virgin, GDK_KEY_d, GDK_CONTROL_MASK | GDK_SHIFT_MASK);

  d->imageid = 0;
  _image_preference_changed(NULL, self); // update delete button label/tooltip
}
#undef ellipsize_button

void gui_reset(dt_lib_module_t *self)
{
  dt_lib_image_t *d = self->data;
  d->imageid = 0;
  dt_lib_gui_queue_update(self);
}

void gui_cleanup(dt_lib_module_t *self)
{
  free(self->data);
  self->data = NULL;
}

#ifdef USE_LUA
typedef struct
{
  const char* key;
  dt_lib_module_t * self;
} lua_callback_data;


static int lua_button_clicked_cb(lua_State* L)
{
  lua_callback_data * data = lua_touserdata(L, 1);
  dt_lua_module_entry_push(L, "lib", data->self->plugin_name);
  lua_getiuservalue(L, -1, 1);
  lua_getfield(L, -1, "callbacks");
  lua_getfield(L, -1, data->key);
  lua_pushstring(L, data->key);

  GList *image = dt_collection_get_selected(darktable.collection, -1);
  lua_newtable(L);
  int table_index = 1;
  while(image)
  {
    luaA_push(L, dt_lua_image_t, &image->data);
    lua_seti(L, -2, table_index);
    table_index++;
    image = g_list_delete_link(image, image);
  }

  lua_call(L, 2, 0);
  return 0;
}

static void lua_button_clicked(GtkWidget *widget,
                               gpointer user_data)
{
  dt_lua_async_call_alien(lua_button_clicked_cb,
      0, NULL, NULL,
      LUA_ASYNC_TYPENAME, "void*", user_data,
      LUA_ASYNC_DONE);
}

static int lua_register_action(lua_State *L)
{
  lua_settop(L, 4);
  dt_lib_module_t *self = lua_touserdata(L, lua_upvalueindex(1));
  dt_lua_module_entry_push(L, "lib", self->plugin_name);
  lua_getiuservalue(L, -1, 1);
  const char* name = luaL_checkstring(L, 1);
  const char* key = luaL_checkstring(L, 2);
  luaL_checktype(L, 3, LUA_TFUNCTION);

  lua_getfield(L, -1, "callbacks");
  lua_pushstring(L, name);
  lua_pushvalue(L, 3);
  lua_settable(L, -3);

  GtkWidget* button = gtk_button_new_with_label(key);
  const char * tooltip = lua_tostring(L, 4);
  if(tooltip)
  {
    gtk_widget_set_tooltip_text(button, tooltip);
  }
  gtk_widget_set_name(button, name);
  dt_lib_image_t *d = self->data;
  gtk_grid_attach_next_to(GTK_GRID(d->page1), button, NULL, GTK_POS_BOTTOM, 4, 1);


  lua_callback_data * data = malloc(sizeof(lua_callback_data));
  data->key = strdup(name);
  data->self = self;
  const gulong s = g_signal_connect_data(G_OBJECT(button), "clicked",
                                         G_CALLBACK(lua_button_clicked), data, NULL, 0);

  // save the signal connection in case we need to destroy it later
  dt_lua_module_entry_push(L, "lib", self->plugin_name);
  lua_getiuservalue(L, -1, 1);
  lua_getfield(L, -1, "signal_handlers");
  lua_pushstring(L, name);
  lua_pushinteger(L, s);
  lua_settable(L, -3);

  gtk_widget_show_all(button);

  return 0;
}

static int lua_destroy_action(lua_State *L)
{
  lua_settop(L, 3);
  dt_lib_module_t *self = lua_touserdata(L, lua_upvalueindex(1));
  const char* name = luaL_checkstring(L, 1);
  dt_lib_image_t *d = self->data;

  // find the button named name

  GtkWidget* widget = NULL;

  for(int row = 5;
      (widget = gtk_grid_get_child_at(GTK_GRID(d->page1), 0, row)) != NULL;
      row++)
  {
    if(GTK_IS_BUTTON(widget) && strcmp(gtk_widget_get_name(widget), name) == 0)
    {
      // remove the callback

      dt_lua_module_entry_push(L, "lib", self->plugin_name);
      lua_getiuservalue(L, -1, 1);
      lua_getfield(L, -1, "callbacks");
      lua_pushstring(L, name);
      lua_pushnil(L);
      lua_settable(L, -3);

      // disconnect the signal

      dt_lua_module_entry_push(L, "lib", self->plugin_name);
      lua_getiuservalue(L, -1, 1);
      lua_getfield(L, -1, "signal_handlers");
      lua_pushstring(L, name);
      lua_gettable(L, -2);
      const gulong handler_id = luaL_checkinteger(L, -1);
      g_signal_handler_disconnect(G_OBJECT(widget), handler_id);

      // remove the widget

      gtk_grid_remove_row(GTK_GRID(d->page1), row);

      break;
    }
  }

  return 0;
}

static int lua_set_action_sensitive(lua_State *L)
{
  lua_settop(L, 3);
  dt_lib_module_t *self = lua_touserdata(L, lua_upvalueindex(1));
  const char* name = luaL_checkstring(L, 1);
  const gboolean sensitive = lua_toboolean(L, 2);
  dt_lib_image_t *d = self->data;

  // find the button named name

  GtkWidget* widget = NULL;

  for(int row = 5;
      (widget = gtk_grid_get_child_at(GTK_GRID(d->page1), 0, row)) != NULL;
      row++)
  {
    if(GTK_IS_BUTTON(widget) && strcmp(gtk_widget_get_name(widget), name) == 0)
    {
      gtk_widget_set_sensitive(widget, sensitive);
      break;
    }
  }
  return 0;
}

void init(dt_lib_module_t *self)
{

  lua_State *L = darktable.lua_state.state;
  int my_type = dt_lua_module_entry_get_type(L, "lib", self->plugin_name);
  lua_pushlightuserdata(L, self);
  lua_pushcclosure(L, lua_register_action, 1);
  dt_lua_gtk_wrap(L);
  lua_pushcclosure(L, dt_lua_type_member_common, 1);
  dt_lua_type_register_const_type(L, my_type, "register_action");

  lua_pushlightuserdata(L, self);
  lua_pushcclosure(L, lua_destroy_action, 1);
  dt_lua_gtk_wrap(L);
  lua_pushcclosure(L, dt_lua_type_member_common, 1);
  dt_lua_type_register_const_type(L, my_type, "destroy_action");

  lua_pushlightuserdata(L, self);
  lua_pushcclosure(L, lua_set_action_sensitive, 1);
  dt_lua_gtk_wrap(L);
  lua_pushcclosure(L, dt_lua_type_member_common, 1);
  dt_lua_type_register_const_type(L, my_type, "set_sensitive");

  dt_lua_module_entry_push(L, "lib", self->plugin_name);
  lua_getiuservalue(L, -1, 1);
  lua_newtable(L);
  lua_setfield(L, -2, "callbacks");
  lua_pop(L, 2);

  dt_lua_module_entry_push(L, "lib", self->plugin_name);
  lua_getiuservalue(L, -1, 1);
  lua_newtable(L);
  lua_setfield(L, -2, "signal_handlers");
  lua_pop(L, 2);
}

#endif
// clang-format off
// modelines: These editor modelines have been set for all relevant files by tools/update_modelines.py
// vim: shiftwidth=2 expandtab tabstop=2 cindent
// kate: tab-indents: off; indent-width 2; replace-tabs on; indent-mode cstyle; remove-trailing-spaces modified;
// clang-format on