package protocol

import (
	"io"
)

type MessageType int

const (
	MessageTypeUnknown MessageType = iota
	MessageTypeRequest
	MessageTypeResponse
	MessageTypeNotification
)

// ClientCodec creates a ClientCodecRequest to process each request.
type ClientCodec interface {
	WriteRequest(w io.Writer, method string, args interface{}, id interface{}) error
	NewMessage(rc io.Reader) (ClientMessageCodec, error)
}

type ClientRequestCodec interface {
	RegistryCodec
}

// ClientMessageCodec decodes a response or notification using a specific
// serialization scheme.
type ClientMessageCodec interface {
	MessageType() MessageType
	// Reads the message filling the RPC response or notification.
	MessageCodec() (interface{}, error)

	Close()
}

type ClientResponseCodec interface {
	Result(result interface{}) error
	Error() error
	ID() interface{}
	Close()
}

type ClientNotificationCodec interface {
	RegistryCodec
}