"use strict";

import { once } from 'events';

import l from 'log';
import { JPake } from 'jpake';

export default async function rekey(connection, secret_join) {
	// 0: Setup jpake
	let jpake = new JPake(secret_join);
	
	// 1: Round 1
	connection.send("jpake-rekey-r1", jpake.GetRound1Message());
	
	// 2: Round 2
	const their_round1 = (await once(connection, "message"))[0];
	if(typeof their_round1 !== "string") return null;
	
	const our_round2 = jpake.GetRound2Message(their_round1);
	if(typeof our_round2 !== "string") return null;
	
	connection.send("jpake-rekey-r2", our_round2);
	
	
	// 3: Compute new shared key
	const their_round2 = (await once(connection, "message"))[0];
	if(typeof their_round2 !== "string") return null;
	const new_shared_key = jpake.ComputeSharedKey(their_round2);
	if(typeof new_shared_key !== "string") return null;
	
	return Buffer.from(new_shared_key, "hex");
	
	// let data_bytes = response[0].toString("base64");
	// 
	// const cert_theirs = decrypt(secret_join, data_bytes.toString("base64"));
	// if(cert_theirs === null) {
	// 	socket.destroy();
	// 	return null;
	// }
	// console.log(`STARTTLS cert_theirs`, cert_theirs);
}