#  R6 Class Representing a Session
# 
# 
#  @details
#  This class defines the interface for session management, including
#  methods for handling data center information, authentication keys,
#  update states, and file caching.
#  @title Session
#  @description Telegram API type Session
#  @export
#  @noRd
#  @noRd
Session <- R6::R6Class(
  "Session",
  public = list(
    #  @description
    #  Constructor for the Session class
    #  @return None.
    initialize = function() {},

    #  @description
    #  Creates a clone of this session object.
    #  @param to_instance An optional instance to clone into.
    #  @return A cloned session object.
    .clone = function(to_instance = NULL) {
      return(if (is.null(to_instance)) self$.clone() else to_instance)
    },

    #  @description
    #  Sets the data center information.
    #  @param dc_id \code{numeric} The data center ID.
    #  @param server_address \code{character} The server address.
    #  @param port \code{numeric} The port number.
    #  @return None.
    set_dc = function(dc_id, server_address, port) {
      stop("Not implemented")
    },

    #  @description
    #  Retrieves the update state for a given entity.
    #  @param entity_id \code{numeric} The ID of the entity.
    #  @return \code{ANY} The update state or NULL if unknown.
    get_update_state = function(entity_id) {
      stop("Not implemented")
    },

    #  @description
    #  Sets the update state for a given entity.
    #  @param entity_id \code{numeric} The ID of the entity.
    #  @param state \code{ANY} The update state to set.
    set_update_state = function(entity_id, state) {
      stop("Not implemented")
    },

    #  @description
    #  Retrieves all known update states.
    #  @return \code{list} A list of entity ID and update state pairs.
    get_update_states = function() {
      stop("Not implemented")
    },

    #  @description
    #  Frees any used resources upon disconnection.
    #  @return None.
    close = function() {},

    #  @description
    #  Persists session information to disk.
    #  @return None.
    save = function() {
      stop("Not implemented")
    },

    #  @description
    #  Deletes the session information from disk.
    #  @return None.
    delete = function() {
      stop("Not implemented")
    },

    #  @description
    #  Processes and saves relevant information from a TLObject.
    #  @param tlo \code{ANY} The TLObject or list to process.
    #  @return None.
    process_entities = function(tlo) {
      stop("Not implemented")
    },

    #  @description
    #  Converts a key into an InputPeer.
    #  @param key \code{ANY} The key to convert.
    #  @return \code{ANY} The corresponding InputPeer.
    get_input_entity = function(key) {
      stop("Not implemented")
    },

    #  @description
    #  Caches file information persistently.
    #  @param md5_digest \code{character} The MD5 digest of the file.
    #  @param file_size \code{numeric} The size of the file.
    #  @param instance \code{ANY} The file instance to cache.
    #  @return None.
    cache_file = function(md5_digest, file_size, instance) {
      stop("Not implemented")
    },

    #  @description
    #  Retrieves cached file information.
    #  @param md5_digest \code{character} The MD5 digest of the file.
    #  @param file_size \code{numeric} The size of the file.
    #  @param cls \code{ANY} The class of the file to retrieve.
    #  @return \code{ANY} The cached file instance or NULL if not found.
    get_file = function(md5_digest, file_size, cls) {
      stop("Not implemented")
    }
  )
)
