import { TOTP } from "../../lib/totp-quickjs";

const otpScheme = "otpauth:/";

export function getTOTPByLink(link) {
	try {
		let args = link.split("/", otpScheme.length);
		let type = args[2]; //Returns 'hotp' or 'totp'
		let issuer = args[3].split(":")[0]?.split("?")[0]; //Returns issuer
		let client =
			args[3].split(":")[1]?.split("?")[0] ??
			args[3].split(":")[0]?.split("?")[0]; //Returns client
		let secret = args[3].split("secret=")[1]?.split("&")[0]; //Returns secret
		let period = args[3].split("period=")[1]?.split("&")[0]; //Returns period
		let digits = args[3].split("digits=")[1]?.split("&")[0]; //Returns digits
		let algorithm = args[3].split("algorithm=")[1]?.split("&")[0]; //Returns algorithm

		if (type.toLowerCase() != "totp")
			throw new Error("Type is not valid, requires 'TOTP'");

		if (secret === undefined) throw new Error("Secret not defined");

        if(issuer == client){
            issuer = args[3].split("issuer=")[1]?.split("&")[0]
        }

		issuer = decodeURIComponent(issuer);
		client = decodeURIComponent(client);

		return new TOTP(
			secret,
			issuer,
			client,
			digits,
			period,
			0,
			getHashType(algorithm)
		);
	} catch (err) {
        console.log(err)
		return null;
	}
}

function getHashType(algorithm) {
	if (algorithm == "SHA1") return "SHA-1";
	if (algorithm == "SHA256") return "SHA-256";
	if (algorithm == "SHA512") return "SHA-512";
	else return "SHA-1";
}