package torrent

import (
	"github.com/anacrolix/torrent/mse"
	pp "github.com/anacrolix/torrent/peer_protocol"
)

// These are called synchronously, and do not pass ownership of arguments (do not expect to retain
// data after returning from the callback). The Client and other locks may still be held. nil
// functions are not called.
type Callbacks struct {
	// Called after a peer connection completes the BitTorrent handshake. The Client lock is not
	// held.
	CompletedHandshake    func(*PeerConn, InfoHash)
	ReadMessage           func(*PeerConn, *pp.Message)
	ReadExtendedHandshake func(*PeerConn, *pp.ExtendedHandshakeMessage)
	PeerConnClosed        func(*PeerConn)

	// Provides secret keys to be tried against incoming encrypted connections.
	ReceiveEncryptedHandshakeSkeys mse.SecretKeyIter

	ReceivedUsefulData []func(ReceivedUsefulDataEvent)
	ReceivedRequested  []func(PeerMessageEvent)
	DeletedRequest     []func(PeerRequestEvent)
	SentRequest        []func(PeerRequestEvent)
	PeerClosed         []func(*Peer)
	NewPeer            []func(*Peer)
}

type ReceivedUsefulDataEvent = PeerMessageEvent

type PeerMessageEvent struct {
	Peer    *Peer
	Message *pp.Message
}

type PeerRequestEvent struct {
	Peer *Peer
	Request
}