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/* -*-c-*- -------------- mix_config.c :
 * Implementation of the functions declared in mix_config.h
 * ------------------------------------------------------------------
 *  Last change: Time-stamp: "01/02/12 00:35:28 jose"
 * ------------------------------------------------------------------
 * Copyright (C) 2001 Free Software Foundation, Inc.
 *  
 * 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 <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include "mix_config.h"

static const gchar COMMENT_PREFIX_ = '#';
static const gchar *DEF_DIR_ = ".mdk";
static const gchar *AUTOSAVE_KEY_ = "Autosave";
static const gchar *AUTOSAVE_YES_ = "True";
static const gchar *AUTOSAVE_NO_ = "False";
static const gchar *DEVICES_KEY_ = "DevicesDir";

/* the config type */
struct mix_config_t 
{
  gchar *filename;		/* full path to configuration file */
  gboolean autosave;		/* whether save on destroy */
  GHashTable *items;		/* configuration items */
};

/* create a new config handler, giving the dir and name of the config file */
mix_config_t *
mix_config_new (const gchar *dirname, const gchar *filename)
{
  static const gchar *DEF_DIRNAME_ = NULL;
  static const gchar *DEF_FILENAME_ = "config";

  const gchar *autosave;
  FILE *f;
  mix_config_t *result = NULL;

  if (DEF_DIRNAME_ == NULL)
    DEF_DIRNAME_ = g_strdup_printf ("%s/%s", g_get_home_dir (), DEF_DIR_);
  
  if (dirname == NULL) dirname = DEF_DIRNAME_;
  if (filename == NULL) filename = DEF_FILENAME_;
  
  if (!mix_stat_dir (dirname, "configuration")) return NULL;

  result = g_new (mix_config_t, 1);      
  result->filename = g_strdup_printf ("%s/%s", dirname, filename);
  result->items = g_hash_table_new (g_str_hash, g_str_equal);

  f = fopen (result->filename, "r");
  if (f != NULL)
    {
      enum {LEN = 256};
      gchar buffer[LEN];
      gchar *line = buffer;
      while (!feof (f))
	{
	  line = fgets (line, LEN, f);
	  if (line) line = g_strstrip (line);
	  if (line && line[0] != COMMENT_PREFIX_)
	    {
	      gchar **vals = g_strsplit (line, "=", 2);
	      g_hash_table_insert (result->items,
				   (gpointer)g_strdup (g_strstrip (vals[0])),
				   (gpointer)g_strdup (g_strstrip (vals[1])));
	      g_strfreev (vals);
	    }
	}
      fclose (f);
    }
      
  autosave = mix_config_get (result, AUTOSAVE_KEY_);
  result->autosave = autosave && !g_strcasecmp (autosave, AUTOSAVE_YES_);

  return result;
}


/* delete a config handler, saving the configuration if needed */
void
mix_config_delete (mix_config_t *config)
{
  g_return_if_fail (config != NULL);
  if (mix_config_is_autosave (config)) mix_config_save (config);
  g_free (config->filename);
  g_hash_table_destroy (config->items);
  g_free (config);
}

/* get the config filename */
const gchar *
mix_config_get_filename (const mix_config_t *config)
{
  g_return_val_if_fail (config != NULL, NULL);
  return config->filename;
}

/* get a config item's value from its key */
const gchar *
mix_config_get (const mix_config_t *config, const gchar *key)
{
  g_return_val_if_fail (config != NULL, NULL);
  g_return_val_if_fail (key != NULL, NULL);
  
  return (const gchar*)g_hash_table_lookup (config->items, key);
}
     

/* update (or create if it does not exist) a new config item */
void
mix_config_update (mix_config_t *config, const gchar *key, const gchar *value)
{
  gpointer tmp = NULL;
  
  g_return_if_fail (config != NULL);
  g_return_if_fail (key != NULL);
  g_return_if_fail (value != NULL);
  
  tmp = g_hash_table_lookup (config->items, key);
  if (tmp)
    {
      g_free (tmp);
      tmp = (gpointer)key;
    }
  else
    {
      tmp = (gpointer)g_strdup (key);
    }
  
  g_hash_table_insert (config->items, tmp, g_strdup (value));
}

/* save the current configuration */
static void
save_ (gpointer key, gpointer value, gpointer file)
{
  fprintf ((FILE *)file, "%s=%s\n", (char *)key, (char *)value);
}

void
mix_config_save (const mix_config_t *config)
{
  FILE *f;
  
  g_return_if_fail (config != NULL);

  f = fopen (config->filename, "w");
  if (!f)
    {
      g_warning ("Unable to open config file %s (%s)",
		 config->filename, g_strerror (errno));
      return;
    }
  g_hash_table_foreach (config->items, save_, (gpointer)f);
  fclose (f);
}

/* set autosave on delete flag */
void
mix_config_set_autosave (mix_config_t *config, gboolean autosave)
{
  mix_config_update (config, AUTOSAVE_KEY_,
		     autosave? AUTOSAVE_YES_ : AUTOSAVE_NO_);
  config->autosave = autosave;
}


gboolean
mix_config_is_autosave (const mix_config_t *config)
{
  g_return_val_if_fail (config != NULL, FALSE);
  return config->autosave;
}

/* devices dir*/
void
mix_config_set_devices_dir (mix_config_t *config, const gchar *dirname)
{
  g_return_if_fail (config != NULL);
  g_return_if_fail (dirname != NULL);
  if (mix_stat_dir (dirname, "devices"))
    mix_config_update (config, DEVICES_KEY_, dirname);
}

extern const gchar *
mix_config_get_devices_dir (const mix_config_t *config)
{
  g_return_val_if_fail (config != NULL, NULL);
  return mix_config_get (config, DEVICES_KEY_);
}