/* PIKA - Photo and Image Kooker Application
 * a rebranding of The GNU Image Manipulation Program (created with heckimp)
 * A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
 *
 * Original copyright, applying to most contents (license remains unchanged): 
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * pikabycolorselecttool.c
 *
 * This program 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.
 *
 * 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 General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#include "config.h"

#include <string.h>

#include <gegl.h>
#include <gtk/gtk.h>

#include "libpikacolor/pikacolor.h"
#include "libpikawidgets/pikawidgets.h"

#include "tools-types.h"

#include "core/pika.h"
#include "core/pikacontainer.h"
#include "core/pikaimage.h"
#include "core/pikaimage-new.h"
#include "core/pikaitem.h"
#include "core/pikapickable.h"
#include "core/pikapickable-contiguous-region.h"

#include "widgets/pikahelp-ids.h"

#include "display/pikadisplay.h"

#include "pikabycolorselecttool.h"
#include "pikaregionselectoptions.h"
#include "pikatoolcontrol.h"

#include "pika-intl.h"


static GeglBuffer * pika_by_color_select_tool_get_mask (PikaRegionSelectTool *region_select,
                                                        PikaDisplay          *display);


G_DEFINE_TYPE (PikaByColorSelectTool, pika_by_color_select_tool,
               PIKA_TYPE_REGION_SELECT_TOOL)

#define parent_class pika_by_color_select_tool_parent_class


void
pika_by_color_select_tool_register (PikaToolRegisterCallback  callback,
                                    gpointer                  data)
{
  (* callback) (PIKA_TYPE_BY_COLOR_SELECT_TOOL,
                PIKA_TYPE_REGION_SELECT_OPTIONS,
                pika_region_select_options_gui,
                0,
                "pika-by-color-select-tool",
                _("Select by Color"),
                _("Select by Color Tool: Select regions with similar colors"),
                N_("_By Color Select"), "<shift>O",
                NULL, PIKA_HELP_TOOL_BY_COLOR_SELECT,
                PIKA_ICON_TOOL_BY_COLOR_SELECT,
                data);
}

static void
pika_by_color_select_tool_class_init (PikaByColorSelectToolClass *klass)
{
  PikaRegionSelectToolClass *region_class;

  region_class = PIKA_REGION_SELECT_TOOL_CLASS (klass);

  region_class->undo_desc = C_("command", "Select by Color");
  region_class->get_mask  = pika_by_color_select_tool_get_mask;
}

static void
pika_by_color_select_tool_init (PikaByColorSelectTool *by_color_select)
{
  PikaTool *tool = PIKA_TOOL (by_color_select);

  pika_tool_control_set_tool_cursor (tool->control, PIKA_TOOL_CURSOR_HAND);
}

static GeglBuffer *
pika_by_color_select_tool_get_mask (PikaRegionSelectTool *region_select,
                                    PikaDisplay          *display)
{
  PikaTool                *tool         = PIKA_TOOL (region_select);
  PikaSelectionOptions    *sel_options  = PIKA_SELECTION_TOOL_GET_OPTIONS (tool);
  PikaRegionSelectOptions *options      = PIKA_REGION_SELECT_TOOL_GET_OPTIONS (tool);
  PikaImage               *image        = pika_display_get_image (display);
  PikaImage               *select_image = NULL;
  GList                   *drawables    = pika_image_get_selected_drawables (image);
  PikaPickable            *pickable;
  GeglBuffer              *mask         = NULL;
  PikaRGB                  srgb;
  gint                     x, y;

  x = region_select->x;
  y = region_select->y;

  if (! options->sample_merged)
    {
      if (g_list_length (drawables) == 1)
        {
          gint off_x, off_y;

          pika_item_get_offset (drawables->data, &off_x, &off_y);

          x -= off_x;
          y -= off_y;

          pickable = PIKA_PICKABLE (drawables->data);
        }
      else
        {
          select_image = pika_image_new_from_drawables (image->pika, drawables, FALSE, FALSE);
          pika_container_remove (image->pika->images, PIKA_OBJECT (select_image));

          pickable = PIKA_PICKABLE (select_image);
          pika_pickable_flush (pickable);
        }
    }
  else
    {
      pickable = PIKA_PICKABLE (image);
    }

  g_list_free (drawables);
  pika_pickable_flush (pickable);

  if (pika_pickable_get_color_at (pickable, x, y, &srgb))
    {
      PikaRGB color;

      pika_pickable_srgb_to_image_color (pickable, &srgb, &color);

      mask = pika_pickable_contiguous_region_by_color (pickable,
                                                       sel_options->antialias,
                                                       options->threshold / 255.0,
                                                       options->select_transparent,
                                                       options->select_criterion,
                                                       &color);
    }

  if (select_image)
    g_object_unref (select_image);

  return mask;
}