/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * Config file serialization and deserialization interface
 * Copyright (C) 2001  Sven Neumann <sven@gimp.org>
 * 
 * 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 <errno.h>
#include <fcntl.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <sys/stat.h>
#include <sys/types.h>

#include <glib-object.h>

#ifdef G_OS_WIN32
#include <io.h>
#endif

#include "gimpconfig.h"
#include "gimpconfig-serialize.h"
#include "gimpconfig-deserialize.h"

#include "libgimp/gimpintl.h"


/* 
 * The GimpConfig serialization and deserialization interface.
 */

static void  gimp_config_iface_init (GimpConfigInterface  *gimp_config_iface);

static void      gimp_config_iface_serialize    (GObject  *object,
                                                 gint      fd);
static gboolean  gimp_config_iface_deserialize  (GObject  *object,
                                                 GScanner *scanner);


GType
gimp_config_interface_get_type (void)
{
  static GType config_iface_type = 0;

  if (!config_iface_type)
    {
      static const GTypeInfo config_iface_info =
      {
        sizeof (GimpConfigInterface),
	(GBaseInitFunc)     gimp_config_iface_init,
	(GBaseFinalizeFunc) NULL,
      };

      config_iface_type = g_type_register_static (G_TYPE_INTERFACE, 
                                                  "GimpConfigInterface", 
                                                  &config_iface_info, 
                                                  0);

      g_type_interface_add_prerequisite (config_iface_type, 
                                         G_TYPE_OBJECT);
    }
  
  return config_iface_type;
}

static void
gimp_config_iface_init (GimpConfigInterface *gimp_config_iface)
{
  gimp_config_iface->serialize   = gimp_config_iface_serialize;
  gimp_config_iface->deserialize = gimp_config_iface_deserialize;
}

static void
gimp_config_iface_serialize (GObject *object,
                             gint     fd)
{
  gimp_config_serialize_properties (object, fd);
}

static gboolean
gimp_config_iface_deserialize (GObject  *object,
                               GScanner *scanner)
{
  return gimp_config_deserialize_properties (object, scanner, FALSE);
}

gboolean
gimp_config_serialize (GObject      *object,
                       const gchar  *filename)
{
  GimpConfigInterface *gimp_config_iface;
  gint                 fd;

  g_return_val_if_fail (G_IS_OBJECT (object), FALSE);
  g_return_val_if_fail (filename != NULL, FALSE);

  gimp_config_iface = GIMP_GET_CONFIG_INTERFACE (object);

  g_return_val_if_fail (gimp_config_iface != NULL, FALSE);

  fd = open (filename, O_WRONLY | O_CREAT, 
#ifndef G_OS_WIN32
             S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
#else
             _S_IREAD | _S_IWRITE);
#endif

  if (fd == -1)
    {
      g_message (_("Failed to open file '%s': %s"),
                 filename, g_strerror (errno));
      return FALSE;
    }

  gimp_config_iface->serialize (object, fd);

  close (fd);

  return TRUE;
}

gboolean
gimp_config_deserialize (GObject      *object,
                         const gchar  *filename)
{
  GimpConfigInterface *gimp_config_iface;
  gint                 fd;
  GScanner            *scanner;
  gboolean             success;

  g_return_val_if_fail (G_IS_OBJECT (object), FALSE);
  g_return_val_if_fail (filename != NULL, FALSE);
  
  gimp_config_iface = GIMP_GET_CONFIG_INTERFACE (object);

  g_return_val_if_fail (gimp_config_iface != NULL, FALSE);

  fd = open (filename, O_RDONLY);

  if (fd == -1)
    {
      g_message (_("Failed to open file '%s': %s"),
                 filename, g_strerror (errno));
      return FALSE;
    }

  scanner = g_scanner_new (NULL);

  scanner->config->cset_identifier_first = ( G_CSET_a_2_z );
  scanner->config->cset_identifier_nth   = ( G_CSET_a_2_z "-_" );

  g_scanner_input_file (scanner, fd);
  scanner->input_name = filename;

  success = gimp_config_iface->deserialize (object, scanner);

  g_scanner_destroy (scanner);
  close (fd);

  return success;
}


/* 
 * Code to store and lookup unknown tokens (string key/value pairs).
 */

#define GIMP_CONFIG_UNKNOWN_TOKENS "gimp-config-unknown-tokens"

typedef struct
{
  gchar *key;
  gchar *value;
} GimpConfigToken;

static void  gimp_config_destroy_unknown_tokens (GSList   *unknown_tokens);


void
gimp_config_add_unknown_token (GObject     *object,
                               const gchar *key,
                               const gchar *value)
{
  GimpConfigToken *token;
  GSList          *unknown_tokens;
  GSList          *last;
  GSList          *list;

  g_return_if_fail (G_IS_OBJECT (object));
  g_return_if_fail (key != NULL);
  g_return_if_fail (value != NULL);

  unknown_tokens = (GSList *) g_object_get_data (object, 
                                                 GIMP_CONFIG_UNKNOWN_TOKENS);

  for (last = NULL, list = unknown_tokens; 
       list; 
       last = list, list = g_slist_next (list))
    {
      token = (GimpConfigToken *) list->data;

      if (strcmp (token->key, key) == 0)
        {
          /* FIXME: should we emit a warning here ?? */
          g_free (token->value);
          token->value = g_strdup (value);
          return;
        }
    }

  token = g_new (GimpConfigToken, 1);
  token->key   = g_strdup (key);
  token->value = g_strdup (value); 

  if (last)
    {
      g_slist_append (last, token);
    }
  else
    {
      unknown_tokens = g_slist_append (NULL, token);
 
      g_object_set_data_full (object, GIMP_CONFIG_UNKNOWN_TOKENS,
                              unknown_tokens, 
             (GDestroyNotify) gimp_config_destroy_unknown_tokens);
    }
}

const gchar *
gimp_config_lookup_unknown_token (GObject     *object,
                                  const gchar *key)
{
  GimpConfigToken *token;
  GSList          *unknown_tokens;
  GSList          *list;

  g_return_val_if_fail (G_IS_OBJECT (object), NULL);
  g_return_val_if_fail (key != NULL, NULL);
  
  unknown_tokens = (GSList *) g_object_get_data (object, 
                                                 GIMP_CONFIG_UNKNOWN_TOKENS);
  
  for (list = unknown_tokens; list; list = g_slist_next (list))
    {
      token = (GimpConfigToken *) list->data;

      if (strcmp (token->key, key) == 0)
        return token->value;
    }

  return NULL;
}

void
gimp_config_foreach_unknown_token (GObject               *object,
                                   GimpConfigForeachFunc  func,
                                   gpointer               user_data)
{
  GimpConfigToken *token;
  GSList          *unknown_tokens;
  GSList          *list;

  g_return_if_fail (G_IS_OBJECT (object));
  g_return_if_fail (func != NULL);
  
  unknown_tokens = (GSList *) g_object_get_data (object, 
                                                 GIMP_CONFIG_UNKNOWN_TOKENS);

  for (list = unknown_tokens; list; list = g_slist_next (list))
    {
      token = (GimpConfigToken *) list->data;
      
      func (token->key, token->value, user_data);
    }  
}

static void
gimp_config_destroy_unknown_tokens (GSList *unknown_tokens)
{
  GimpConfigToken *token;
  GSList          *list;

  for (list = unknown_tokens; list; list = g_slist_next (list))
    {
      token = (GimpConfigToken *) list->data;
      
      g_free (token->key);
      g_free (token->value);
      g_free (token);
    }
  
  g_slist_free (unknown_tokens);
}