/* The GIMP -- an 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 "libgimpconfig/gimpconfig.h"

#include "text-types.h"

#include "core/gimpitem.h"
#include "core/gimpitemundo.h"
#include "core/gimp-utils.h"

#include "gimptext.h"
#include "gimptextlayer.h"
#include "gimptextundo.h"


enum
{
  PROP_0,
  PROP_PARAM
};


static GObject * gimp_text_undo_constructor  (GType                  type,
                                              guint                  n_params,
                                              GObjectConstructParam *params);
static void      gimp_text_undo_set_property (GObject               *object,
                                              guint                  property_id,
                                              const GValue          *value,
                                              GParamSpec            *pspec);
static void      gimp_text_undo_get_property (GObject               *object,
                                              guint                  property_id,
                                              GValue                *value,
                                              GParamSpec            *pspec);

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

static void      gimp_text_undo_pop          (GimpUndo              *undo,
                                              GimpUndoMode           undo_mode,
                                              GimpUndoAccumulator   *accum);
static void      gimp_text_undo_free         (GimpUndo              *undo,
                                              GimpUndoMode           undo_mode);


G_DEFINE_TYPE (GimpTextUndo, gimp_text_undo, GIMP_TYPE_ITEM_UNDO)

#define parent_class gimp_text_undo_parent_class


static void
gimp_text_undo_class_init (GimpTextUndoClass *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_text_undo_constructor;
  object_class->set_property     = gimp_text_undo_set_property;
  object_class->get_property     = gimp_text_undo_get_property;

  gimp_object_class->get_memsize = gimp_text_undo_get_memsize;

  undo_class->pop                = gimp_text_undo_pop;
  undo_class->free               = gimp_text_undo_free;

  g_object_class_install_property (object_class, PROP_PARAM,
                                   g_param_spec_param ("param", NULL, NULL,
                                                       G_TYPE_PARAM,
                                                       GIMP_PARAM_READWRITE |
                                                       G_PARAM_CONSTRUCT_ONLY));
}

static void
gimp_text_undo_init (GimpTextUndo *undo)
{
}

static GObject *
gimp_text_undo_constructor (GType                  type,
                            guint                  n_params,
                            GObjectConstructParam *params)
{
  GObject       *object;
  GimpTextUndo  *text_undo;
  GimpTextLayer *layer;

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

  text_undo = GIMP_TEXT_UNDO (object);

  g_assert (GIMP_IS_TEXT_LAYER (GIMP_ITEM_UNDO (text_undo)->item));

  layer = GIMP_TEXT_LAYER (GIMP_ITEM_UNDO (text_undo)->item);

  if (text_undo->pspec)
    {
      g_assert (text_undo->pspec->owner_type == GIMP_TYPE_TEXT);

      text_undo->value = g_new0 (GValue, 1);

      g_value_init (text_undo->value, text_undo->pspec->value_type);
      g_object_get_property (G_OBJECT (layer->text),
                             text_undo->pspec->name, text_undo->value);
    }
  else if (layer->text)
    {
      text_undo->text = gimp_config_duplicate (GIMP_CONFIG (layer->text));
    }

  return object;
}

static void
gimp_text_undo_set_property (GObject      *object,
                             guint         property_id,
                             const GValue *value,
                             GParamSpec   *pspec)
{
  GimpTextUndo *text_undo = GIMP_TEXT_UNDO (object);

  switch (property_id)
    {
    case PROP_PARAM:
      text_undo->pspec = g_value_get_param (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
      break;
    }
}

static void
gimp_text_undo_get_property (GObject    *object,
                             guint       property_id,
                             GValue     *value,
                             GParamSpec *pspec)
{
  GimpTextUndo *text_undo = GIMP_TEXT_UNDO (object);

  switch (property_id)
    {
    case PROP_PARAM:
      g_value_set_param (value, (GParamSpec *) text_undo->pspec);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
      break;
    }
}

static gint64
gimp_text_undo_get_memsize (GimpObject *object,
                            gint64     *gui_size)
{
  GimpTextUndo *undo    = GIMP_TEXT_UNDO (object);
  gint64        memsize = 0;

  if (undo->value)
    memsize += gimp_g_value_get_memsize (undo->value);

  if (undo->text)
    memsize += gimp_object_get_memsize (GIMP_OBJECT (undo->text), NULL);

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

static void
gimp_text_undo_pop (GimpUndo            *undo,
                    GimpUndoMode         undo_mode,
                    GimpUndoAccumulator *accum)
{
  GimpTextUndo  *text_undo = GIMP_TEXT_UNDO (undo);
  GimpTextLayer *layer     = GIMP_TEXT_LAYER (GIMP_ITEM_UNDO (undo)->item);

  if (text_undo->pspec)
    {
      GValue *value;

      g_return_if_fail (layer->text != NULL);

      value = g_new0 (GValue, 1);
      g_value_init (value, text_undo->pspec->value_type);

      g_object_get_property (G_OBJECT (layer->text),
                             text_undo->pspec->name, value);

      g_object_set_property (G_OBJECT (layer->text),
                             text_undo->pspec->name, text_undo->value);

      g_value_unset (text_undo->value);
      g_free (text_undo->value);

      text_undo->value = value;
    }
  else
    {
      GimpText *text;

      text = (layer->text ?
              gimp_config_duplicate (GIMP_CONFIG (layer->text)) : NULL);

      if (layer->text && text_undo->text)
        gimp_config_sync (G_OBJECT (text_undo->text),
                          G_OBJECT (layer->text), 0);
      else
        gimp_text_layer_set_text (layer, text_undo->text);

      if (text_undo->text)
        g_object_unref (text_undo->text);

      text_undo->text = text;
    }

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

static void
gimp_text_undo_free (GimpUndo     *undo,
                     GimpUndoMode  undo_mode)
{
  GimpTextUndo *text_undo = GIMP_TEXT_UNDO (undo);

  if (text_undo->text)
    {
      g_object_unref (text_undo->text);
      text_undo->text = NULL;
    }

  if (text_undo->pspec)
    {
      g_value_unset (text_undo->value);
      g_free (text_undo->value);

      text_undo->value = NULL;
      text_undo->pspec = NULL;
    }

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