/*
 * Copyright (C) Sapphirecode - All Rights Reserved
 * This file is part of encoding-helper which is released under MIT.
 * See file 'LICENSE' for full license details.
 * Created by Timo Hocker <timo@scode.ovh>, May 2020
 */


/* eslint-disable no-magic-numbers */
'use strict';

const b58 = require ('b58');

function get_buffer (str, encoding) {
  if (encoding === 'base58')
    return b58.decode (str);

  return Buffer.from (str, encoding);
}

/**
 * encode a string to base64
 *
 * @param {string} str string to encode
 * @param {string} encoding encoding the string is in
 * @returns {string} base64
 */
function to_b64 (str, encoding = '') {
  const buf = get_buffer (str, encoding);
  return buf.toString ('base64');
}

/**
 * encode a string to base58
 *
 * @param {string} str string to encode
 * @param {string} encoding encoding the string is in
 * @returns {string} base58
 */
function to_b58 (str, encoding = '') {
  const buf = get_buffer (str, encoding);
  return b58.encode (buf);
}

/**
 * encode a string to utf-8
 *
 * @param {string} str string to encode
 * @param {string} encoding encoding the string is in
 * @returns {string} utf-8
 */
function to_utf8 (str, encoding) {
  const buf = get_buffer (str, encoding);
  return buf.toString ('utf-8');
}

/**
 * encode a string to hex
 *
 * @param {string} str string to encode
 * @param {string} encoding encoding the string is in
 * @returns {string} hex
 */
function to_hex (str, encoding = '') {
  const buf = get_buffer (str, encoding);
  return buf.toString ('hex');
}

/**
 * encode a number to hex
 *
 * @param {number} n number to encode
 * @param {number} padding minumum length of output
 * @returns {string} hex
 */
function num_to_hex (n, padding = 0) {
  const res = n.toString (16);
  if (res.length < padding)
    return '0'.repeat (padding - res.length) + res;
  return res;
}

/**
 * decode a number from hex
 *
 * @param {string} h hex to decode
 * @returns {number} number
 */
function hex_to_num (h) {
  return parseInt (h, 16);
}

module.exports = {
  to_b64,
  to_b58,
  to_hex,
  to_utf8,
  num_to_hex,
  hex_to_num
};