package libp2p

import (
	"fmt"

	"github.com/libp2p/go-libp2p"
	"github.com/libp2p/go-libp2p/core/host"
	"github.com/libp2p/go-libp2p/core/peer"
	"github.com/libp2p/go-libp2p/core/peerstore"
)

type HostOption func(id peer.ID, ps peerstore.Peerstore, options ...libp2p.Option) (host.Host, error)

var DefaultHostOption HostOption = constructPeerHost

// isolates the complex initialization steps
func constructPeerHost(id peer.ID, ps peerstore.Peerstore, options ...libp2p.Option) (host.Host, error) {
	pkey := ps.PrivKey(id)
	if pkey == nil {
		return nil, fmt.Errorf("missing private key for node ID: %s", id)
	}
	options = append([]libp2p.Option{libp2p.Identity(pkey), libp2p.Peerstore(ps)}, options...)
	return libp2p.New(options...)
}