<?php
namespace Shared\Cache;

class CacheHandler
{
  public static function store( $key, $data, $ttl = 86400 )
  {
    file_put_contents( self::get_file_name( $key ), gzdeflate( serialize( array( time() + $ttl, $data ) ) ) );
  }

  private static function get_file_name( $key )
  {
    $md5 = md5( $key );
    $dir = 'temp/' . $md5[0] . '/' . $md5[1] . '/';

    if ( !is_dir( $dir ) )
      mkdir( $dir, 0755, true );

    return $dir . 's_cache_' . $md5;
  }

  public static function fetch( $key )
  {
    $filename = self::get_file_name( $key );

    if ( !file_exists( $filename ) || !is_readable( $filename ) )
      return false;

    $data = gzinflate( file_get_contents( $filename ) );

    $data = @unserialize( $data );
    if ( !$data )
    {
      unlink( $filename );
      return false;
    }

    if ( time() > $data[0] )
    {
      if ( file_exists( $filename ) )
        unlink( $filename );
      return false;
    }

    return $data[1];
  }
}