/* Dia -- a diagram creation/manipulation program
 * Copyright (C) 1998 Alexander Larsson
 *
 * Property system for dia objects/shapes.
 * Copyright (C) 2000 James Henstridge
 * Copyright (C) 2001 Cyrille Chepelov
 * Major restructuration done in August 2001 by C. Chepelov
 *
 * Propobject.c: routines which deal with Dia Objects and affect their 
 * properties.
 *
 * Most of these routines used to exist in code before the restructuration. 
 * They've lost most of their meat, in favour for more modularity.
 *
 * 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.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <string.h>

#include <glib.h>
#include "properties.h"
#include "propinternals.h"

const PropDescription *
object_get_prop_descriptions(const Object *obj) {
  const PropDescription *pdesc;
  if (!obj->ops->describe_props) return NULL;

  pdesc = obj->ops->describe_props((Object *)obj); /* Yes... */
  if (pdesc[0].quark != 0) return pdesc;

  prop_desc_list_calculate_quarks((PropDescription *)pdesc); /* Yes again... */
  return pdesc;
}


/* ------------------------------------------------------ */
/* Change management                                      */

/* an ObjectChange structure for setting of properties */
typedef struct _ObjectPropChange ObjectPropChange;
struct _ObjectPropChange {
  ObjectChange obj_change;

  Object *obj;
  GPtrArray *saved_props;
};

static void
object_prop_change_apply_revert(ObjectPropChange *change, Object *obj)
{
  GPtrArray *old_props;

  old_props = prop_list_copy_empty(change->saved_props);

  if (change->obj->ops->get_props)
    change->obj->ops->get_props(change->obj, old_props);

  /* set saved property values */
  if (change->obj->ops->set_props)
    change->obj->ops->set_props(change->obj, change->saved_props);

  /* move old props to saved properties */
  prop_list_free(change->saved_props);
  change->saved_props = old_props;
}

static void
object_prop_change_free(ObjectPropChange *change)
{
  prop_list_free(change->saved_props);
}

ObjectChange *
object_apply_props(Object *obj, GPtrArray *props)
{
  ObjectPropChange *change;
  GPtrArray *old_props;

  change = g_new0(ObjectPropChange, 1);

  change->obj_change.apply =
    (ObjectChangeApplyFunc) object_prop_change_apply_revert;
  change->obj_change.revert =
    (ObjectChangeRevertFunc) object_prop_change_apply_revert;
  change->obj_change.free =
    (ObjectChangeFreeFunc) object_prop_change_free;

  change->obj = obj;

  /* create new properties structure with current values */
  old_props = prop_list_copy_empty(props);

  if (obj->ops->get_props)
    obj->ops->get_props(obj, old_props);

  /* set saved property values */
  if (obj->ops->set_props)
    obj->ops->set_props(obj, props);

  change->saved_props = old_props;

  return (ObjectChange *)change;
}


/* Get/Set routines */

gboolean
object_get_props_from_offsets(Object *obj, PropOffset *offsets,
                              GPtrArray *props)
{
  prop_offset_list_calculate_quarks(offsets);
  do_get_props_from_offsets(obj,props,offsets);

  return TRUE;
}

gboolean
object_set_props_from_offsets(Object *obj, PropOffset *offsets,
                              GPtrArray *props)
{
  prop_offset_list_calculate_quarks(offsets);
  do_set_props_from_offsets(obj,props,offsets);

  return TRUE;
}


WIDGET *
object_create_props_dialog(Object *obj)
{
  return prop_dialog_new(obj)->widget;
}


ObjectChange *
object_apply_props_from_dialog(Object *obj, WIDGET *dialog_widget)
{
  PropDialog *dialog = prop_dialog_from_widget(dialog_widget);

  prop_get_data_from_widgets(dialog);
  return object_apply_props(obj, dialog->props);
}


gboolean 
object_complies_with_stdprop(const Object *obj) 
{
  if (obj->ops->set_props == NULL) {
    g_warning("No set_props !");
    return FALSE;
  }
  if (obj->ops->get_props == NULL) {
    g_warning("No get_props !");
    return FALSE;
  }
  if (obj->ops->describe_props == NULL) {
    g_warning("No describe_props !");
    return FALSE;
  }
  if (object_get_prop_descriptions(obj) == NULL) {
    g_warning("No properties !");
    return FALSE;
  }
  return TRUE;
}

void 
object_copy_props(Object *dest, Object *src)
{
  GPtrArray *props;

  g_return_if_fail(src != NULL);
  g_return_if_fail(dest != NULL);
  g_return_if_fail(strcmp(src->type->name,dest->type->name)==0);
  g_return_if_fail(src->ops == dest->ops);
  g_return_if_fail(object_complies_with_stdprop(src));
  g_return_if_fail(object_complies_with_stdprop(dest));

  props = prop_list_from_descs(object_get_prop_descriptions(src),
                               pdtpp_do_save);  

  src->ops->get_props(src, props);
  dest->ops->set_props(dest, props);

  prop_list_free(props);  
}

void
object_load_props(Object *obj, ObjectNode obj_node)
{
  GPtrArray *props;

  g_return_if_fail(obj != NULL);
  g_return_if_fail(obj_node != NULL);
  g_return_if_fail(object_complies_with_stdprop(obj));

  props = prop_list_from_descs(object_get_prop_descriptions(obj),
                               pdtpp_do_load);  

  prop_list_load(props,obj_node);

  obj->ops->set_props(obj, props);
  prop_list_free(props);
}

void
object_save_props(Object *obj, ObjectNode obj_node)
{
  GPtrArray *props;

  g_return_if_fail(obj != NULL);
  g_return_if_fail(obj_node != NULL);
  g_return_if_fail(object_complies_with_stdprop(obj));

  props = prop_list_from_descs(object_get_prop_descriptions(obj),
                               pdtpp_do_save);  

  obj->ops->get_props(obj, props);
  prop_list_save(props,obj_node);
  prop_list_free(props);
}

Property *
object_prop_by_name_type(Object *obj, const char *name, const char *type)
{
  const PropDescription *pdesc;
  GQuark name_quark = g_quark_from_string(name);

  if (!object_complies_with_stdprop(obj)) return NULL;

  for (pdesc = object_get_prop_descriptions(obj);
       pdesc->name != NULL;
       pdesc++) {
    if ((pdesc->quark == name_quark)) {
      Property *prop;
      static GPtrArray *plist = NULL;
      
      if (type && (0 != strcmp(pdesc->type,type))) continue;
      
      if (!plist) {
        plist = g_ptr_array_new();
        g_ptr_array_set_size(plist,1);
      }
      prop = pdesc->ops->new_prop(pdesc,pdtpp_from_object);
      g_ptr_array_index(plist,0) = prop;
      obj->ops->get_props(obj,plist);
      return prop;
    }    
  }
  return NULL;
}

Property *
object_prop_by_name(Object *obj, const char *name)
{
  return object_prop_by_name_type(obj,name,NULL);
}