"use strict";

exports.__esModule = true;

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var nacl;
try {
	nacl = require("tweetnacl");
} catch (e) {
	// no tweetnacl!
}

var nonce = new Buffer(24);
nonce.fill(0);

var VoicePacket = function VoicePacket(data, sequence, time, ssrc, secret) {
	_classCallCheck(this, VoicePacket);

	if (!nacl) {
		throw new Error("tweetnacl not found! Perhaps you didn't install it.");
	}
	var mac = secret ? 16 : 0;
	var packetLength = data.length + 12 + mac;

	var audioBuffer = data;
	var returnBuffer = new Buffer(packetLength);

	returnBuffer.fill(0);
	returnBuffer[0] = 0x80;
	returnBuffer[1] = 0x78;

	returnBuffer.writeUIntBE(sequence, 2, 2);
	returnBuffer.writeUIntBE(time, 4, 4);
	returnBuffer.writeUIntBE(ssrc, 8, 4);

	if (secret) {
		// copy first 12 bytes
		returnBuffer.copy(nonce, 0, 0, 12);
		audioBuffer = nacl.secretbox(data, nonce, secret);
	}

	for (var i = 0; i < audioBuffer.length; i++) {
		returnBuffer[i + 12] = audioBuffer[i];
	}

	return returnBuffer;
};

exports["default"] = VoicePacket;
module.exports = exports["default"];