package ru.m;

import haxe.io.Bytes;
import haxe.crypto.BaseCode;

class Base64 {
  private inline static var BASE64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  private static var codec:BaseCode;

  public function new() {}

  static function getCodec():BaseCode {
    if (codec == null) {
      var bytes = Bytes.ofString(BASE64);
      codec = new BaseCode(bytes);
    }
    return codec;
  }

  public static function encodeBase64(content:haxe.io.Bytes):String {
    var suffix = switch (content.length % 3) {
      case 2: "=";
      case 1: "==";
      default: "";
    };

    var bytes = getCodec().encodeBytes(content);
    return bytes.toString() + suffix;
  }

  private static function removeNullbits(s:String):String {
    var len = s.length;
    while (len > 0 && s.charAt(len - 1) == "=") {
      len--;
      if (len <= 0) {
        return "";
      }
    }
    return s.substr(0, len);
  }

  public static function decodeBase64(content:String):Bytes {
    var bytes:Bytes = Bytes.ofString(removeNullbits(content));
    return getCodec().decodeBytes(bytes);
  }
}