<?php
namespace TronTool;

use kornrunner\Keccak;
use StephenHill\Base58;

define('TRON_ALPHABET','123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz');

class Address{
  protected $base58;
  protected $hex;

  function hex(){
    return $this->hex;
  }

  function base58(){
    return $this->base58;
  }

  protected function __construct($hex){
    $this->hex = $hex;
    $this->base58 = $this->encode($this->hex);
  }

  static function fromPublicKey($key){
    $hex = self::compute($key);
    return new self($hex);
  }

  static function fromHex($hex){
    return new self($hex);
  }

  static function fromBase58($b58){
    $hex = self::decode($b58);
    return new self($hex);
  }

  static function compute($publicKey){
    $bin = hex2bin($publicKey);
    $bin = substr($bin,1);
    $hash = Keccak::hash($bin,256);
    $hex = '41' . substr($hash,24);
    return $hex;
  }

  static function encode($hex){
    $base58 = new Base58(TRON_ALPHABET);
    $bin = hex2bin($hex);
    $hash0 = hash('sha256',$bin,true);
    $hash1 = hash('sha256',$hash0,true);
    $checksum = substr($hash1,0,4);
    $encoded = $base58->encode($bin . $checksum);
    return $encoded;
  }

  static function decode($b58){
    if(is_null($b58)) return null;
    $base58 = new Base58(TRON_ALPHABET);
    $decoded = $base58->decode($b58);
    $decoded = substr($decoded,0,-4);
    return bin2hex($decoded);
  }

  function __toString(){
    return $this->base58;
  }

}