<?php
require_once('database.php');

$storage_cache = array();
class Storage {
  private $defaults = array(
    'Id'        => null,
    'Path'      => '',
    'Name'      => '',
    'Type'      => 'local',
    'Url'       => '',
    'DiskSpace' => null,
    'Scheme'    => 'Medium',
    'ServerId'  => 0,
    'DoDelete'  => 1,
  );

  public function __construct( $IdOrRow = NULL ) {
    global $storage_cache;
    
    $row = NULL;
    if ( $IdOrRow ) {
      if ( is_integer($IdOrRow) or is_numeric($IdOrRow) ) {
        $row = dbFetchOne('SELECT * FROM Storage WHERE Id=?', NULL, array($IdOrRow));
        if ( ! $row ) {
          Error('Unable to load Storage record for Id=' . $IdOrRow);
        }
      } else if ( is_array($IdOrRow) ) {
        $row = $IdOrRow;
      }
    }
    if ( $row ) {
      foreach ($row as $k => $v) {
        $this->{$k} = $v;
      }
      $storage_cache[$row['Id']] = $this;
    } else {
      $this->{'Name'} = '';
      $this->{'Path'} = '';
      $this->{'Type'} = 'local';
    }
  }

  public function Path() {
    if ( isset( $this->{'Path'} ) and ( $this->{'Path'} != '' ) ) {
      return $this->{'Path'};
    } else if ( ! isset($this->{'Id'}) ) {
      $path = ZM_DIR_EVENTS;
      if ( $path[0] != '/' ) {
        $this->{'Path'} = ZM_PATH_WEB.'/'.ZM_DIR_EVENTS;
      } else {
        $this->{'Path'} = ZM_DIR_EVENTS;
      }
      return $this->{'Path'};
    }
    return $this->{'Name'};
  }
  public function Name() {
    if ( isset( $this->{'Name'} ) and ( $this->{'Name'} != '' ) ) {
      return $this->{'Name'};
    } else if ( ! isset($this->{'Id'}) ) {
      return 'Default';
    }
    return $this->{'Name'};
  }

  public function __call( $fn, array $args= NULL ) {
    if ( count($args) ) {
      $this->{$fn} = $args[0];
    }
    if ( array_key_exists($fn, $this) )
      return $this->{$fn};
        
    if ( array_key_exists( $fn, $this->defaults ) )
      return $this->defaults{$fn};

    $backTrace = debug_backtrace();
    $file = $backTrace[0]['file'];
    $line = $backTrace[0]['line'];
    Warning("Unknown function call Storage->$fn from $file:$line");
    $file = $backTrace[1]['file'];
    $line = $backTrace[1]['line'];
    Warning("Unknown function call Storage->$fn from $file:$line");
  }

  public static function find_one( $parameters = null, $options = null ) {
    global $storage_cache;
    if ( 
        ( count($parameters) == 1 ) and
        isset($parameters['Id']) and
        isset($storage_cache[$parameters['Id']]) ) {
      return $storage_cache[$parameters['Id']];
    }

    $results = Storage::find($parameters, $options);
    if ( count($results) > 1 ) {
      Error("Storage Returned more than 1");
      return $results[0];
    } else if ( count($results) ) {
      return $results[0];
    } else {
      return null;
    }
  }
  public static function find( $parameters = null, $options = null ) {
    $sql = 'SELECT * FROM Storage ';
    $values = array();

    if ( $parameters ) {
      $fields = array();
      $sql .= 'WHERE ';
      foreach ( $parameters as $field => $value ) {
        if ( $value == null ) {
          $fields[] = $field.' IS NULL';
        } else if ( is_array($value) ) {
          $func = function(){return '?';};
          $fields[] = $field.' IN ('.implode(',', array_map($func, $value)). ')';
          $values += $value;

        } else {
          $fields[] = $field.'=?';
          $values[] = $value;
        }
      }
      $sql .= implode(' AND ', $fields);
    } # end if parameters
    if ( $options ) {
      if ( isset($options['order']) ) {
        $sql .= ' ORDER BY ' . $options['order'];
      } # end if options
      if ( isset($options['limit']) ) {
        if ( is_integer($options['limit']) or ctype_digit($options['limit']) ) {
          $sql .= ' LIMIT ' . $option['limit'];
        } else {
          $backTrace = debug_backtrace();
          $file = $backTrace[1]['file'];
          $line = $backTrace[1]['line'];
          Error("Invalid value for limit(".$options['limit'].") passed to Control::find from $file:$line");
          return array();
        }
      } # end if limit
    } # end if options
    $storage_areas = array();
    $result = dbQuery($sql, $values);
    if ( $result ) {
      $results = $result->fetchALL();
      foreach ( $results as $row ) {
        $storage_areas[] = new Storage($row);
      }
    }
    return $storage_areas;
  } # end find()

  public function disk_usage_percent() {
    $path = $this->Path();
    if ( ! $path ) {
      Warning('Storage::disk_usage_percent: path is empty');
      return 0;
    } else if ( ! file_exists($path) ) {
      Warning("Storage::disk_usage_percent: path $path does not exist");
      return 0;
    }
      
    $total = $this->disk_total_space();
    if ( ! $total ) {
      Error('disk_total_space returned false for ' . $path );
      return 0;
    }
    $used = $this->disk_used_space();
    $usage = round( ($used / $total) * 100);
    //Logger::Debug("Used $usage = round( ( $used / $total ) * 100 )");
    return $usage;
  }

  public function disk_total_space() {
    if ( !array_key_exists('disk_total_space', $this) ) {
      $path = $this->Path();
      if ( file_exists($path) ) {
        $this->{'disk_total_space'} = disk_total_space($path);
      } else {
        Error("Path $path does not exist.");
        $this->{'disk_total_space'} = 0;
      }
    }
    return $this->{'disk_total_space'};
  }

  public function disk_used_space() {
    # This isn't a function like this in php, so we have to add up the space used in each event.
    if ( ( !array_key_exists('disk_used_space', $this)) or !$this->{'disk_used_space'} ) {
      if ( $this->{'Type'} == 's3fs' ) {
        $this->{'disk_used_space'} = $this->event_disk_space();
      } else { 
        $path = $this->Path();
        if ( file_exists($path) ) {
          $this->{'disk_used_space'} = disk_total_space($path) - disk_free_space($path);
        } else {
          Error("Path $path does not exist.");
          $this->{'disk_used_space'} = 0;
        }
      }
    }
    return $this->{'disk_used_space'};
  } // end function disk_used_space

  public function event_disk_space() {
    # This isn't a function like this in php, so we have to add up the space used in each event.
    if ( (! array_key_exists('DiskSpace', $this)) or (!$this->{'DiskSpace'}) ) {
      $used = dbFetchOne('SELECT SUM(DiskSpace) AS DiskSpace FROM Events WHERE StorageId=? AND DiskSpace IS NOT NULL', 'DiskSpace', array($this->Id()) );

      foreach ( Event::find(array('StorageId'=>$this->Id(), 'DiskSpace'=>null)) as $Event ) {
        $Event->Storage($this); // Prevent further db hit
        $used += $Event->DiskSpace();
      }
      $this->{'DiskSpace'} = $used;
    }
    return $this->{'DiskSpace'};
  } // end function event_disk_space

  public function Server() {
    if ( ! array_key_exists('Server',$this) ) {
      $this->{'Server'}= new Server( $this->{'ServerId'} );
    }
    return $this->{'Server'};
  }

  public function to_json() {
    $json = array();
    foreach ($this->defaults as $key => $value) {
      if ( is_callable(array($this, $key)) ) {
        $json[$key] = $this->$key();
      } else if ( array_key_exists($key, $this) ) {
        $json[$key] = $this->{$key};
      } else {
        $json[$key] = $this->defaults{$key};
      }
    }
    return json_encode($json);
  }
}
?>