/* Gimp - The GNU Image Manipulation Program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * 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 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 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.
 */

#include "config.h"

#include <glib-object.h>

#include "libgimpbase/gimpbase.h"

#include "core-types.h"

#include "gimp-utils.h"
#include "gimpitem.h"
#include "gimpitempropundo.h"
#include "gimpparasitelist.h"


enum
{
  PROP_0,
  PROP_PARASITE_NAME
};


static GObject * gimp_item_prop_undo_constructor  (GType                  type,
                                                   guint                  n_params,
                                                   GObjectConstructParam *params);
static void      gimp_item_prop_undo_set_property (GObject               *object,
                                                   guint                  property_id,
                                                   const GValue          *value,
                                                   GParamSpec            *pspec);
static void      gimp_item_prop_undo_get_property (GObject               *object,
                                                   guint                  property_id,
                                                   GValue                *value,
                                                   GParamSpec            *pspec);

static gint64    gimp_item_prop_undo_get_memsize  (GimpObject            *object,
                                                   gint64                *gui_size);

static void      gimp_item_prop_undo_pop          (GimpUndo              *undo,
                                                   GimpUndoMode           undo_mode,
                                                   GimpUndoAccumulator   *accum);
static void      gimp_item_prop_undo_free         (GimpUndo              *undo,
                                                   GimpUndoMode           undo_mode);


G_DEFINE_TYPE (GimpItemPropUndo, gimp_item_prop_undo, GIMP_TYPE_ITEM_UNDO)

#define parent_class gimp_item_prop_undo_parent_class


static void
gimp_item_prop_undo_class_init (GimpItemPropUndoClass *klass)
{
  GObjectClass    *object_class      = G_OBJECT_CLASS (klass);
  GimpObjectClass *gimp_object_class = GIMP_OBJECT_CLASS (klass);
  GimpUndoClass   *undo_class        = GIMP_UNDO_CLASS (klass);

  object_class->constructor      = gimp_item_prop_undo_constructor;
  object_class->set_property     = gimp_item_prop_undo_set_property;
  object_class->get_property     = gimp_item_prop_undo_get_property;

  gimp_object_class->get_memsize = gimp_item_prop_undo_get_memsize;

  undo_class->pop                = gimp_item_prop_undo_pop;
  undo_class->free               = gimp_item_prop_undo_free;

  g_object_class_install_property (object_class, PROP_PARASITE_NAME,
                                   g_param_spec_string ("parasite-name",
                                                        NULL, NULL,
                                                        NULL,
                                                        GIMP_PARAM_READWRITE |
                                                        G_PARAM_CONSTRUCT_ONLY));
}

static void
gimp_item_prop_undo_init (GimpItemPropUndo *undo)
{
}

static GObject *
gimp_item_prop_undo_constructor (GType                  type,
                                 guint                  n_params,
                                 GObjectConstructParam *params)
{
  GObject          *object;
  GimpItemPropUndo *item_prop_undo;
  GimpItem         *item;

  object = G_OBJECT_CLASS (parent_class)->constructor (type, n_params, params);

  item_prop_undo = GIMP_ITEM_PROP_UNDO (object);

  item = GIMP_ITEM_UNDO (object)->item;

  switch (GIMP_UNDO (object)->undo_type)
    {
    case GIMP_UNDO_ITEM_RENAME:
      item_prop_undo->name = g_strdup (gimp_object_get_name (GIMP_OBJECT (item)));
      break;

    case GIMP_UNDO_ITEM_DISPLACE:
      gimp_item_offsets (item,
                         &item_prop_undo->offset_x,
                         &item_prop_undo->offset_y);
      break;

    case GIMP_UNDO_ITEM_VISIBILITY:
      item_prop_undo->visible = gimp_item_get_visible (item);
      break;

    case GIMP_UNDO_ITEM_LINKED:
      item_prop_undo->linked  = gimp_item_get_linked (item);
      break;

    case GIMP_UNDO_PARASITE_ATTACH:
    case GIMP_UNDO_PARASITE_REMOVE:
      g_assert (item_prop_undo->parasite_name != NULL);

      item_prop_undo->parasite = gimp_parasite_copy
        (gimp_item_parasite_find (item, item_prop_undo->parasite_name));
      break;

    default:
      g_assert_not_reached ();
    }

  return object;
}

static void
gimp_item_prop_undo_set_property (GObject      *object,
                                  guint         property_id,
                                  const GValue *value,
                                  GParamSpec   *pspec)
{
  GimpItemPropUndo *item_prop_undo = GIMP_ITEM_PROP_UNDO (object);

  switch (property_id)
    {
    case PROP_PARASITE_NAME:
      item_prop_undo->parasite_name = g_value_dup_string (value);
      break;

    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
      break;
    }
}

static void
gimp_item_prop_undo_get_property (GObject    *object,
                                  guint       property_id,
                                  GValue     *value,
                                  GParamSpec *pspec)
{
  GimpItemPropUndo *item_prop_undo = GIMP_ITEM_PROP_UNDO (object);

  switch (property_id)
    {
    case PROP_PARASITE_NAME:
      g_value_set_string (value, item_prop_undo->parasite_name);
      break;

    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
      break;
    }
}

static gint64
gimp_item_prop_undo_get_memsize (GimpObject *object,
                                 gint64     *gui_size)
{
  GimpItemPropUndo *item_prop_undo = GIMP_ITEM_PROP_UNDO (object);
  gint64            memsize        = 0;

  memsize += gimp_string_get_memsize (item_prop_undo->name);
  memsize += gimp_string_get_memsize (item_prop_undo->parasite_name);
  memsize += gimp_parasite_get_memsize (item_prop_undo->parasite, NULL);

  return memsize + GIMP_OBJECT_CLASS (parent_class)->get_memsize (object,
                                                                  gui_size);
}

static void
gimp_item_prop_undo_pop (GimpUndo            *undo,
                         GimpUndoMode         undo_mode,
                         GimpUndoAccumulator *accum)
{
  GimpItemPropUndo *item_prop_undo = GIMP_ITEM_PROP_UNDO (undo);
  GimpItem         *item           = GIMP_ITEM_UNDO (undo)->item;

  GIMP_UNDO_CLASS (parent_class)->pop (undo, undo_mode, accum);

  switch (undo->undo_type)
    {
    case GIMP_UNDO_ITEM_RENAME:
      {
        gchar *name;

        name = g_strdup (gimp_object_get_name (GIMP_OBJECT (item)));
        gimp_object_take_name (GIMP_OBJECT (item), item_prop_undo->name);
        item_prop_undo->name = name;
      }
      break;

    case GIMP_UNDO_ITEM_DISPLACE:
      {
        gint offset_x;
        gint offset_y;

        gimp_item_offsets (item, &offset_x, &offset_y);

        gimp_item_translate (item,
                             item_prop_undo->offset_x - offset_x,
                             item_prop_undo->offset_y - offset_y,
                             FALSE);

        item_prop_undo->offset_x = offset_x;
        item_prop_undo->offset_y = offset_y;
      }
      break;

    case GIMP_UNDO_ITEM_VISIBILITY:
      {
        gboolean visible;

        visible = gimp_item_get_visible (item);
        gimp_item_set_visible (item, item_prop_undo->visible, FALSE);
        item_prop_undo->visible = visible;
      }
      break;

    case GIMP_UNDO_ITEM_LINKED:
      {
        gboolean linked;

        linked = gimp_item_get_linked (item);
        gimp_item_set_linked (item, item_prop_undo->linked, FALSE);
        item_prop_undo->linked = linked;
      }
      break;

    case GIMP_UNDO_PARASITE_ATTACH:
    case GIMP_UNDO_PARASITE_REMOVE:
      {
        GimpParasite *parasite;

        parasite = item_prop_undo->parasite;

        item_prop_undo->parasite = gimp_parasite_copy
          (gimp_item_parasite_find (item, item_prop_undo->parasite_name));

        if (parasite)
          gimp_parasite_list_add (item->parasites, parasite);
        else
          gimp_parasite_list_remove (item->parasites,
                                     item_prop_undo->parasite_name);

        if (parasite)
          gimp_parasite_free (parasite);
      }
      break;

    default:
      g_assert_not_reached ();
    }
}

static void
gimp_item_prop_undo_free (GimpUndo     *undo,
                          GimpUndoMode  undo_mode)
{
  GimpItemPropUndo *item_prop_undo = GIMP_ITEM_PROP_UNDO (undo);

  if (item_prop_undo->name)
    {
      g_free (item_prop_undo->name);
      item_prop_undo->name = NULL;
    }

  if (item_prop_undo->parasite_name)
    {
      g_free (item_prop_undo->parasite_name);
      item_prop_undo->parasite_name = NULL;
    }

  if (item_prop_undo->parasite)
    {
      gimp_parasite_free (item_prop_undo->parasite);
      item_prop_undo->parasite = NULL;
    }

  GIMP_UNDO_CLASS (parent_class)->free (undo, undo_mode);
}