// Really, this whole interface should be used only via the GConf 
// client library. I reserve the right to change it whenever I feel 
// like it. So there.

enum ConfigBasicValueType { BInvalidVal, BIntVal, BStringVal, BFloatVal, BBoolVal, BSchemaVal };

enum ConfigValueType { InvalidVal, IntVal, StringVal, FloatVal, BoolVal, SchemaVal, ListVal, PairVal };

struct ConfigSchema {
  ConfigValueType value_type;
  ConfigValueType value_list_type;
  ConfigValueType value_car_type;
  ConfigValueType value_cdr_type;
  string locale;
  string short_desc;
  string long_desc;
  string owner;
  // Work around lack of recursive data types
  string encoded_default_value;
};

union ConfigBasicValue switch (ConfigBasicValueType) {
 case BInvalidVal:
   long dummy;
 case BIntVal: 
   long int_value;
 case BStringVal:
   string string_value;
 case BFloatVal:
   float float_value;
 case BBoolVal:
   boolean bool_value;
   // hope this doesn't slow down transmission of smaller types 
 case BSchemaVal:
   ConfigSchema schema_value;
};

typedef sequence<ConfigBasicValue> BasicValueList;

struct ConfigList {
  BasicValueList seq;
  ConfigBasicValueType list_type;
};

union ConfigValue switch (ConfigValueType) {
 case InvalidVal:
   long dummy;
 case IntVal:
   long int_value;
 case StringVal:
   string string_value;
 case FloatVal:
   float float_value;
 case BoolVal:
   boolean bool_value;
 case SchemaVal:
   ConfigSchema schema_value;
 case ListVal:
   ConfigList list_value;
 case PairVal:
   BasicValueList pair_value;
};

interface ConfigDatabase;

interface ConfigListener {
  typedef sequence<string> KeyList;
  
  oneway void notify (in ConfigDatabase database,
                      in unsigned long cnxn,
                      in string key,
                      in ConfigValue value,
                      in boolean is_default,
                      in boolean is_writable);

  oneway void ping ();

  /// This should conceivably not be oneway.
  /// I'm worried about the server blocking waiting for
  /// busy clients.

  oneway void update_listener (in ConfigDatabase database,
                               in string db_address,
                               in unsigned long old_cnxn,
                               in string where,
                               in unsigned long new_cnxn);
  
  oneway void invalidate_cached_values (in ConfigDatabase database,
                                        in KeyList keys);
  
  // Called when a new daemon starts up, and we need to drop caches
  // in case the new daemon has a different default database
  oneway void drop_all_caches ();
};

// Sync this with GConfErrNo in gconf.h, when it makes sense
// (e.g. G_CONF_NO_SERVER doesn't make sense here)

enum ConfigErrorType {
  ConfigFailed, ConfigNoPermission,
  ConfigBadAddress, ConfigBadKey,
  ConfigParseError, ConfigCorrupt,
  ConfigTypeMismatch, ConfigIsDir, ConfigIsKey,
  ConfigOverridden, ConfigLockFailed,
  ConfigNoWritableDatabase, ConfigInShutdown
};

exception ConfigException {
  ConfigErrorType err_no;
  string message;
};

interface ConfigDatabase {
  typedef sequence<string> KeyList;
  typedef sequence<ConfigValue> ValueList;
  typedef sequence<boolean> IsDefaultList;
  typedef sequence<boolean> IsWritableList;
  
  // "where" is the portion of the namespace to listen to
  // Returns a connection ID for removal
  unsigned long add_listener(in string where,
                             in ConfigListener who);  

  void remove_listener(in unsigned long cnxn);
  
  ConfigValue lookup(in string key)
    raises (ConfigException);

  // separate from lookup for efficiency
  ConfigValue lookup_with_locale(in string key,
                                 in string locale,
                                 in boolean use_schema_default,
                                 out boolean value_is_default,
                                 out boolean value_is_writable)
    raises (ConfigException);

  // syntactic sugar, semi-hack: should maybe use a get_metainfo()
  // function (which we should have anyway)
  ConfigValue lookup_default_value(in string key,
                                   in string locale)
    raises (ConfigException);

  // Grab lots of values at once
  void batch_lookup (in KeyList keys,
                     in string locale,
                     out ValueList values,
                     out IsDefaultList is_defaults,
                     out IsWritableList is_writables)
    raises (ConfigException);
  
  void set(in string key, in ConfigValue value)
    raises (ConfigException);
  
  void unset(in string key)
    raises (ConfigException);

  void unset_with_locale(in string key, in string locale)
    raises (ConfigException);

  // Setting to InvalidVal does an unset
  void batch_change(in string locale, // only used for unsets 
                    in KeyList keys,
                    in ValueList values)
    raises (ConfigException);
  
  boolean dir_exists(in string dir)
    raises (ConfigException);

  void remove_dir(in string dir)
    raises (ConfigException);

  void all_entries(in string dir,
                   in string locale,
                   out KeyList keys,
                   out ValueList values,
                   out IsDefaultList is_defaults,
                   out IsWritableList is_writables)
    raises (ConfigException);

  void all_dirs(in string dir,
                out KeyList subdirs)
    raises (ConfigException);
  
  // if first arg is a key, second arg should be a key pointing
  //  to a schema. 
  // if first arg is a dir, second arg should be a key pointing 
  //  to a dir full of schemas.
  void set_schema(in string key,
                  in string schema_key)
    raises (ConfigException);

  void sync()
    raises (ConfigException);

  void clear_cache();
  
  void synchronous_sync()
    raises (ConfigException);
};

interface ConfigDatabase2 : ConfigDatabase {

  typedef sequence<string> SchemaNameList;
  
  // Fixed version of lookup_with_locale that gets
  // all the relevant information
  ConfigValue lookup_with_schema_name (in string key,
                                       in string locale,
                                       in boolean use_schema_default,
                                       out string  schema_name,
                                       out boolean value_is_default,
                                       out boolean value_is_writable)
    raises (ConfigException);
  
  void all_entries_with_schema_name (in string dir,
                                     in string locale,
                                     out KeyList keys,
                                     out ValueList values,
                                     out SchemaNameList schema_names,
                                     out IsDefaultList is_defaults,
                                     out IsWritableList is_writables)
    raises (ConfigException);  
};

interface ConfigServer {

  ConfigDatabase get_default_database ();

  // Use a specific address instead of the default database;
  // invalid_context returned on failure.
  ConfigDatabase get_database (in string address);

  void add_client (in ConfigListener client);
  void remove_client (in ConfigListener client);
  
  long ping();

  void shutdown();
};