package socketapi

import (
	"crypto/rand"
	"net/http"

	"github.com/fasthttp/websocket"

	"realy.lol/bech32encoding"
	"realy.lol/chk"
	"realy.lol/ec/bech32"
	"realy.lol/ws"
)

const (
	DefaultChallengeHRP    = "nchal"
	DefaultChallengeLength = 16
)

// GetListener generates a new ws.Listener with a new challenge for a subscriber.
func GetListener(conn *websocket.Conn, req *http.Request) (w *ws.Listener) {
	var err error
	cb := make([]byte, DefaultChallengeLength)
	if _, err = rand.Read(cb); chk.E(err) {
		panic(err)
	}
	var b5 []byte
	if b5, err = bech32encoding.ConvertForBech32(cb); chk.E(err) {
		return
	}
	var encoded []byte
	if encoded, err = bech32.Encode([]byte(DefaultChallengeHRP), b5); chk.E(err) {
		return
	}
	w = ws.NewListener(conn, req, encoded)
	return
}