require_once("bitcoinecdsa.php");

use BitcoinPHP\BitcoinECDSA\BitcoinECDSA;

function btc_balance($public_key)
{
$balance=curl("https://blockchain.info/q/getreceivedbyaddress/$public_key?confirmations=1");
if(is_numeric($balance))
{
$balance=btc8($balance);
return $balance;
}
return (int)0;
}

function btc_price($unit)
{
$cachefile = "cache/btc_usd.txt";
if($unit=='tl') { $cachefile = "cache/btc_tl.txt"; }
elseif($unit=='eur') { $cachefile = "cache/btc_eur.txt"; }
if (file_exists($cachefile) && (time() - 600 < filemtime($cachefile))) {
return file_get_contents($cachefile);
}
if($unit=='eur')
{
$balance=curl("http://preev.com/pulse/units:btc+eur/sources:btce");
}
else { $balance=curl("http://preev.com/pulse/units:btc+try/sources:bitstamp"); }
$balance=@json_decode($balance,1);
if(is_array($balance))
{
if($unit!='eur')
{
if(isset($balance['btc']['usd']['bitstamp']['last']))
{
//print_r($balance);
$usd_price=intval($balance['btc']['usd']['bitstamp']['last']);
$tl_price=intval(1/$balance['try']['usd']['other']['last']*$usd_price);
fwrite(fopen('cache/btc_usd.txt', 'w'), $usd_price);
fwrite(fopen('cache/btc_tl.txt', 'w'), $tl_price);
if($unit=='tl') { return $tl_price; }
return $usd_price;
}
}
else {
if(isset($balance['btc']['eur']['btce']['last']))
{
$eur_price=(int)$balance['btc']['eur']['btce']['last'];
fwrite(fopen('cache/btc_eur.txt', 'w'), $eur_price);
return $eur_price;
}
}
}
return file_get_contents($cachefile);
}


function curl($link, $post = null, $retries = 10){
        $curl = curl_init($link);
        if(is_resource($curl) === true){
                curl_setopt($curl, CURLOPT_FAILONERROR, true);
                curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
                curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
				curl_setopt($curl, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.76 Safari/537.36");  
                curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
                curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
                if(isset($post) === true){
                        curl_setopt($curl, CURLOPT_POST, true);
                        curl_setopt($curl, CURLOPT_POSTFIELDS, (is_array($post) === true) ? http_build_query($post, "", "&"): $post);
                }
                $result = false;
                while(($result === false) && (--$retries > 0)){
                        $result = curl_exec($curl);
                }
                curl_close($curl);
        }
        return $result;
}


function check_if_paid_bitcoin($public_key,$fee)
{
$balance=btc_balance($public_key);
// 0.0002 transaction fee
if(($balance-0.0002)>=$fee)
{
return true;
}
return false;
}

function needs_to_pay_bitcoin($public_key,$fee)
{
$balance=btc_balance($public_key);
return $fee-$balance;
}

function btc8($val)
{
$a = bcmul($val, "1.0", 1);
return bcdiv($a, "100000000", 8);
}


function is_user_paid($uniqueid)
{
	global $mysqli;
	$stmt = $mysqli->prepare("SELECT is_paid,btc_public_key,fee FROM payments WHERE userid=?");
    $stmt->bind_param("s", $uniqueid);
    $stmt->execute();
    $stmt->bind_result($is_paid,$btc_public_key,$fee);
    $stmt->fetch();
    return check_if_paid_bitcoin($btc_public_key,$fee);
}


function generate_bitcoin_wallet()
{
$bitcoinECDSA = new BitcoinECDSA();
$bitcoinECDSA->generateRandomPrivateKey();
return array($bitcoinECDSA->getWif(),$bitcoinECDSA->getAddress());
}


function fetch($result)
{
    $array = array();
    
    if($result instanceof mysqli_stmt)
    {
        $result->store_result();
        
        $variables = array();
        $data = array();
        $meta = $result->result_metadata();
        
        while($field = $meta->fetch_field())
            $variables[] = &$data[$field->name]; // pass by reference
        
        call_user_func_array(array($result, 'bind_result'), $variables);
        
        $i=0;
        while($result->fetch())
        {
            $array[$i] = array();
            foreach($data as $k=>$v)
                $array[$i][$k] = $v;
            $i++;
            
        }
    }
    elseif($result instanceof mysqli_result)
    {
        while($row = $result->fetch_assoc())
            $array[] = $row;
    }
    
    return $array;
}

  function percent($a,$b){ 
    $c = $a / 100;  
    return floor($b / $c);  
  }