package torrent

import (
	"github.com/RoaringBitmap/roaring"
	"github.com/anacrolix/torrent/metainfo"
)

// Contains implementation details that differ between peer types, like Webseeds and regular
// BitTorrent protocol connections. Some methods are underlined so as to avoid collisions with
// legacy PeerConn methods.
type peerImpl interface {
	// Trigger the actual request state to get updated
	handleUpdateRequests()
	// Whether the outstanding local request cardinality is low enough to warrant an update.
	isLowOnRequests() bool
	writeInterested(interested bool) bool

	// Neither of these return buffer room anymore, because they're currently both posted. There's
	// also PeerConn.writeBufferFull for when/where it matters.
	_cancel(RequestIndex) bool
	_request(Request) bool

	connectionFlags() string
	onClose()
	onGotInfo(*metainfo.Info)
	drop()
	String() string
	connStatusString() string

	// All if the peer should have everything, known if we know that for a fact. For example, we can
	// guess at how many pieces are in a torrent, and assume they have all pieces based on them
	// having sent haves for everything, but we don't know for sure. But if they send a have-all
	// message, then it's clear that they do.
	peerHasAllPieces() (all, known bool)
	peerPieces() *roaring.Bitmap
}