import crypto from 'crypto';
const RFC_4648 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
export class TotpChecker {
    static async ValidateTotp(totpSecret, code) {
        if (!totpSecret && !code)
            return true;
        if ((!totpSecret && code) || (totpSecret && !code))
            return false;
        return true;
    }
    static EncodeBase32(input) {
        let secret = [];
        for (let i of input)
            secret.push(RFC_4648[i % RFC_4648.length]);
        return secret.join("");
    }
    static GenerateCode(optionsOrIssuer) {
        let options = typeof optionsOrIssuer === "string" ? { issuer: optionsOrIssuer } : optionsOrIssuer;
        options.digits = options.digits || 6;
        options.period = options.period || 30;
        options.algorithm = options.algorithm || "SHA-1";
        options.label = encodeURIComponent(options.label || options.issuer);
        options.secretLength = options.secretLength || 13;
        const secretStr = TotpChecker.EncodeBase32(crypto.randomBytes(options.secretLength));
        return {
            url: `otpauth://totp/${options.issuer}?issuer=${options.issuer}&secret=${secretStr}&digits=${options.digits}&period=${options.period}&algorithm=${options.algorithm}`,
            secret: secretStr
        };
    }
}
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