module HTTPX
  class Connection
    interface _Parser

      def on: (Symbol) { (*untyped) -> void } -> void
      def empty?: () -> bool
      # def exhausted?: () -> bool
      def close: () -> void
      def consume: () -> void
      def <<: (string) -> void
      # def send: (Request) -> void
      # def ping: () -> void
      # def timeout: () -> (Integer | Float)

    end

    extend Forwardable
    include Loggable
    include Callbacks


    attr_reader type: io_type
    attr_reader origin: URI::Generic
    attr_reader origins: Array[String]
    attr_reader state: Symbol
    attr_reader pending: Array[Request]
    attr_reader options: Options
    attr_writer timers: Timers

    attr_accessor family: Integer?

    @window_size: Integer
    @read_buffer: Buffer
    @write_buffer: Buffer
    @inflight: Integer
    @keep_alive_timeout: Numeric?
    @timeout: Numeric?
    @current_timeout: Numeric?
    @total_timeout: Numeric?
    @io: TCP | SSL | UNIX
    @parser: HTTP1 | HTTP2 | _Parser
    @connected_at: Float
    @response_received_at: Float

    def addresses: () -> Array[ipaddr]?

    def addresses=: (Array[ipaddr]) -> void

    def match?: (URI::Generic uri, Options options) -> bool

    def expired?: () -> boolish

    def mergeable?: (Connection) -> bool

    def coalescable?: (Connection) -> bool

    def create_idle: (?Hash[Symbol, untyped] options) -> Connection

    def merge: (Connection) -> void

    def purge_pending: () { (Request) -> void } -> void

    def match_altsvcs?: (URI::Generic uri) -> bool

    def match_altsvc_options?: (URI::Generic uri, Options options) -> bool

    def connecting?: () -> bool

    def inflight?: () -> boolish

    def interests: () -> io_interests?

    def to_io: () -> ::IO

    def call: () -> void

    def close: () -> void

    def reset: () -> void

    def send: (Request) -> void

    def timeout: () -> Numeric?

    def idling: () -> void

    def used?: () -> boolish

    def deactivate: () -> void

    def open?: () -> bool

    def raise_timeout_error: (Numeric interval) -> void

    private

    def initialize: (io_type, URI::Generic, options) -> untyped

    def connect: () -> void

    def exhausted?: () -> boolish

    def consume: () -> void

    def send_pending: () -> void

    def parser: () -> (HTTP1 | HTTP2 | _Parser)

    def send_request_to_parser: (Request request) -> void

    def build_parser: (?String protocol) -> (HTTP1 | HTTP2)

    def set_parser_callbacks: (HTTP1 | HTTP2 parser) -> void

    def transition: (Symbol) -> void

    def handle_transition: (Symbol) -> void

    def build_socket: (?Array[ipaddr]? addrs) -> (TCP | SSL | UNIX)

    def on_error: (HTTPX::TimeoutError | Error | StandardError) -> void

    def handle_error: (StandardError) -> void

    def purge_after_closed: () -> void

    def set_request_timeouts: (Request request) -> void

    def write_timeout_callback: (Request request, Numeric write_timeout) -> void

    def read_timeout_callback: (Request request, Numeric read_timeout, ?singleton(RequestTimeoutError) error_type) -> void

    def self.parser_type: (String protocol) -> (singleton(HTTP1) | singleton(HTTP2))
  end
end