/* 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 <stdlib.h>
#include <string.h>

#include <gtk/gtk.h>

#include "libgimpmath/gimpmath.h"

#include "apptypes.h"

#include "appenv.h"
#include "datafiles.h"
#include "gimpdata.h"
#include "gimpdatalist.h"

#include "libgimp/gimpintl.h"


static void   gimp_data_list_class_init         (GimpDataListClass *klass);
static void   gimp_data_list_init               (GimpDataList      *list);
static void   gimp_data_list_add                (GimpContainer     *container,
						 GimpObject        *object);
static void   gimp_data_list_remove             (GimpContainer     *container,
						 GimpObject        *object);

static void   gimp_data_list_uniquefy_data_name (GimpDataList      *data_list,
						 GimpObject        *object);
static void   gimp_data_list_object_renamed_callabck (GimpObject   *object,
						      GimpDataList *data_list);
static gint   gimp_data_list_data_compare_func  (gconstpointer      first,
						 gconstpointer      second);


static GimpListClass *parent_class = NULL;


GtkType
gimp_data_list_get_type (void)
{
  static GtkType type = 0;

  if (!type)
    {
      GtkTypeInfo info =
      {
	"GimpDataList",
	sizeof (GimpDataList),
	sizeof (GimpDataListClass),
	(GtkClassInitFunc) gimp_data_list_class_init,
	(GtkObjectInitFunc) gimp_data_list_init,
	/* reserved_1 */ NULL,
	/* reserved_2 */ NULL,
	(GtkClassInitFunc) NULL
      };

      type = gtk_type_unique (GIMP_TYPE_LIST, &info);
    }

  return type;
}

static void
gimp_data_list_class_init (GimpDataListClass *klass)
{
  GimpContainerClass *container_class;
  
  container_class = (GimpContainerClass *) klass;

  parent_class = gtk_type_class (GIMP_TYPE_LIST);

  container_class->add    = gimp_data_list_add;
  container_class->remove = gimp_data_list_remove;
}

static void
gimp_data_list_init (GimpDataList *list)
{
}

static void
gimp_data_list_add (GimpContainer *container,
		    GimpObject    *object)
{
  GimpList *list;

  list = GIMP_LIST (container);

  gimp_data_list_uniquefy_data_name (GIMP_DATA_LIST (container), object);

  list->list = g_list_insert_sorted (list->list, object,
				     gimp_data_list_data_compare_func);

  gtk_signal_connect (GTK_OBJECT (object), "name_changed",
		      GTK_SIGNAL_FUNC (gimp_data_list_object_renamed_callabck),
		      container);
}

static void
gimp_data_list_remove (GimpContainer *container,
		       GimpObject    *object)
{
  GimpList *list;

  list = GIMP_LIST (container);

  gtk_signal_disconnect_by_func (GTK_OBJECT (object),
				 gimp_data_list_object_renamed_callabck,
				 container);

  list->list = g_list_remove (list->list, object);
}

GimpDataList *
gimp_data_list_new (GtkType  children_type)

{
  GimpDataList *list;

  g_return_val_if_fail (gtk_type_is_a (children_type, GIMP_TYPE_DATA), NULL);

  list = GIMP_DATA_LIST (gtk_type_new (GIMP_TYPE_DATA_LIST));

  GIMP_CONTAINER (list)->children_type = children_type;
  GIMP_CONTAINER (list)->policy        = GIMP_CONTAINER_POLICY_STRONG;

  return list;
}

typedef struct _GimpDataListLoaderData GimpDataListLoaderData;

struct _GimpDataListLoaderData
{
  GimpDataList *data_list;
  GSList       *loader_funcs;
  GSList       *extensions;
};

void
gimp_data_list_load_callback (const gchar *filename,
			      gpointer     callback_data)
{
  GimpDataListLoaderData   *loader_data;
  GSList                   *func_list;
  GSList                   *ext_list;
  GimpDataObjectLoaderFunc  loader_func;
  const gchar              *extension;

  loader_data = (GimpDataListLoaderData *) callback_data;

  for (func_list = loader_data->loader_funcs, ext_list = loader_data->extensions;
       func_list && ext_list;
       func_list = func_list->next, ext_list = ext_list->next)
    {
      loader_func = (GimpDataObjectLoaderFunc) func_list->data;
      extension   = (const gchar *) ext_list->data;

      if (extension)
	{
	  if (datafiles_check_extension (filename, extension))
	    {
	      goto insert;
	    }
	}
      else
	{
	  g_warning ("%s(): trying legacy loader on file with unknown "
		     "extension: %s",
		     G_GNUC_FUNCTION, filename);
	  goto insert;
	}
    }

  return;

 insert:
  {
    GimpData *data;

    data = (GimpData *) (* loader_func) (filename);

    if (! data)
      g_message (_("Warning: Failed to load data from\n\"%s\""), filename);
    else
      gimp_container_add (GIMP_CONTAINER (loader_data->data_list),
			  GIMP_OBJECT (data));
  }
}

void
gimp_data_list_load (GimpDataList             *data_list,
		     const gchar              *data_path,
		     GimpDataObjectLoaderFunc  loader_func,
		     const gchar              *extension,
		     ...)
{
  GimpDataListLoaderData *loader_data;
  va_list                 args;

  g_return_if_fail (data_list != NULL);
  g_return_if_fail (GIMP_IS_DATA_LIST (data_list));
  g_return_if_fail (data_path != NULL);
  g_return_if_fail (loader_func != NULL);

  loader_data = g_new0 (GimpDataListLoaderData, 1);

  loader_data->data_list    = data_list;
  loader_data->loader_funcs = g_slist_append (loader_data->loader_funcs,
					      loader_func);
  loader_data->extensions   = g_slist_append (loader_data->extensions,
					      (gpointer) extension);

  va_start (args, extension);

  while (extension)
    {
      loader_func = va_arg (args, GimpDataObjectLoaderFunc);

      if (loader_func)
	{
	  extension = va_arg (args, const gchar *);

	  loader_data->loader_funcs = g_slist_append (loader_data->loader_funcs,
						      loader_func);
	  loader_data->extensions   = g_slist_append (loader_data->extensions,
						      (gpointer) extension);
	}
      else
	{
	  extension = NULL;
	}
    }

  va_end (args);

  gimp_container_freeze (GIMP_CONTAINER (data_list));

  datafiles_read_directories (data_path, 0,
			      gimp_data_list_load_callback, loader_data);

  gimp_container_thaw (GIMP_CONTAINER (data_list));

  g_slist_free (loader_data->loader_funcs);
  g_slist_free (loader_data->extensions);
  g_free (loader_data);
}

void
gimp_data_list_save_and_clear (GimpDataList *data_list,
			       const gchar  *data_path)
{
  GimpList *list;

  g_return_if_fail (data_list != NULL);
  g_return_if_fail (GIMP_IS_DATA_LIST (data_list));

  list = GIMP_LIST (data_list);

  gimp_container_freeze (GIMP_CONTAINER (data_list));

  while (list->list)
    {
      GimpData *data;

      data = GIMP_DATA (list->list->data);

      if (! data->filename)
	gimp_data_create_filename (data,
				   GIMP_OBJECT (data)->name,
				   data_path);

      if (data->dirty)
	gimp_data_save (data);

      gimp_container_remove (GIMP_CONTAINER (data_list), GIMP_OBJECT (data));
    }

  gimp_container_thaw (GIMP_CONTAINER (data_list));
}

static void
gimp_data_list_uniquefy_data_name (GimpDataList *data_list,
				   GimpObject   *object)
{
  GList      *base_list;
  GList      *list;
  GList      *list2;
  GimpObject *object2;
  gint        unique_ext = 0;
  gchar      *new_name   = NULL;
  gchar      *ext;

  g_return_if_fail (GIMP_IS_DATA_LIST (data_list));
  g_return_if_fail (GIMP_IS_OBJECT (object));

  base_list = GIMP_LIST (data_list)->list;

  for (list = base_list; list; list = g_list_next (list))
    {
      object2 = GIMP_OBJECT (list->data);

      if (object != object2 &&
	  strcmp (gimp_object_get_name (GIMP_OBJECT (object)),
		  gimp_object_get_name (GIMP_OBJECT (object2))) == 0)
	{
          ext = strrchr (GIMP_OBJECT (object)->name, '#');

          if (ext)
            {
              gchar *ext_str;

              unique_ext = atoi (ext + 1);

              ext_str = g_strdup_printf ("%d", unique_ext);

              /*  check if the extension really is of the form "#<n>"  */
              if (! strcmp (ext_str, ext + 1))
                {
                  *ext = '\0';
                }
              else
                {
                  unique_ext = 0;
                }

              g_free (ext_str);
            }
          else
            {
              unique_ext = 0;
            }

          do
            {
              unique_ext++;

              g_free (new_name);

              new_name = g_strdup_printf ("%s#%d",
                                          GIMP_OBJECT (object)->name,
                                          unique_ext);

              for (list2 = base_list; list2; list2 = g_list_next (list2))
                {
                  object2 = GIMP_OBJECT (list2->data);

                  if (object == object2)
                    continue;

                  if (! strcmp (GIMP_OBJECT (object2)->name, new_name))
                    {
                      break;
                    }
                }
            }
          while (list2);

	  gimp_object_set_name (GIMP_OBJECT (object), new_name);
	  g_free (new_name);

	  if (gimp_container_have (GIMP_CONTAINER (data_list), object))
	    {
	      gtk_object_ref (GTK_OBJECT (object));
	      gimp_container_remove (GIMP_CONTAINER (data_list), object);
	      gimp_container_add (GIMP_CONTAINER (data_list), object);
	      gtk_object_unref (GTK_OBJECT (object));
	    }

	  break;
	}
    }
}

static void
gimp_data_list_object_renamed_callabck (GimpObject   *object,
					GimpDataList *data_list)
{
  gimp_data_list_uniquefy_data_name (data_list, object);
}

static gint
gimp_data_list_data_compare_func (gconstpointer first,
				  gconstpointer second)
{
  return strcmp (((const GimpObject *) first)->name, 
		 ((const GimpObject *) second)->name);
}