<?php
$r = rand(0, 1);
$id = $_GET['id'];
$in = $_GET['in'];

$line_number = false;
if ($handle = fopen("balance.dat", "r")) {
   $count = 0;
   while (($line = fgets($handle, 4096)) !== FALSE and !$line_number) {
      $count++;
      $line_number = (strpos($line, $id) !== FALSE) ? $count : $line_number;
   }
   fclose($handle);
}
$lines = file("balance.dat");
$line_number = $line_number - 1;
$bal = str_replace($id."!","",$lines[$line_number]);


if((int)$in < (int)$bal){
switch($r){
  case 0:
  $win = "prohral/a";
  $out = $in * -1;
  break;
  case 1:
  $win = "vyhral/a";
  $out = $in;
  break;
}

$line_number = false;
if ($handle = fopen("balance.dat", "r")) {
   $count = 0;
   while (($line = fgets($handle, 4096)) !== FALSE and !$line_number) {
      $count++;
      $line_number = (strpos($line, $id) !== FALSE) ? $count : $line_number;
   }
   fclose($handle);
}
if(!$line_number) {
  $m = (int)$out+1000;
  file_put_contents("balance.dat", $id."!".$m.PHP_EOL, FILE_APPEND);
} else {
  $lines = file("balance.dat");
  $line_number = $line_number-1;
  $bal = str_replace($id."!","",$lines[$line_number]);
  $balnew = $bal + $out;
  if($out < 0){
  $balnew = $bal + $out;
  } else {
  $balnew = $bal + $in;
  }

  $lines = str_replace($lines[$line_number], $id."!".$balnew.PHP_EOL, $lines);
  file_put_contents("balance.dat", $lines);

}
$out = str_replace("-","",$out);
echo "hodil/a minci a ";
echo $win;
echo " ";
echo $out;
echo " dolaru, ";

if ($handle = fopen("balance.dat", "r")) {
   $count = 0;
   while (($line = fgets($handle, 4096)) !== FALSE and !$line_number) {
      $count++;
      $line_number = (strpos($line, $id) !== FALSE) ? $count : $line_number;
   }
   fclose($handle);
}
$lines = file("balance.dat");
$line_number = $line_number - 1;
$bal = str_replace($id."!","",$lines[$line_number]);

if($bal > 0){
  echo "tudiz je stav jeho/jejiho konta ".$bal." dolaru.";
} else {
  echo "tudiz zkrachoval/a! Stav jeho/jejiho konta bude resetovan zpatky na 1000 dolaru.";
  $line_number = false;
if ($handle = fopen("balance.dat", "r")) {
   $count = 0;
   while (($line = fgets($handle, 4096)) !== FALSE and !$line_number) {
      $count++;
      $line_number = (strpos($line, $id) !== FALSE) ? $count : $line_number;
   }
   fclose($handle);
}
if(!$line_number) {
  file_put_contents("balance.dat", $id."!"."1000".PHP_EOL, FILE_APPEND);
} else {
  $lines = file("balance.dat");
  $line_number = $line_number - 1;
  $lines = str_replace($lines[$line_number], $id."!"."1000".PHP_EOL, $lines);
  file_put_contents("balance.dat", $lines);
}
}
} else {
  echo "na tuto sazku nema dostatek penez!";
}
?>