<?php 
class uuid
{
	protected $storage = array();
	
	function __construct($filepath)
	{
		if(!(file_exists($filepath)))
		{
			throw new Exception('Le fichier n\'existe pas');
		}
		
		$this->filepath = $filepath;
	}
	
	public function check_uuid($write = true)
	{
		require_once GV_RootPath.'lib/index_utils2.php';
		$cmd = NULL;
	
		$system = p4utils::getSystem();
	
		if(in_array($system, array('DARWIN', 'LINUX')))
		{
			$cmd = GV_exiftool.' -X -n -fast ' . escapeshellarg($this->filepath) . '';
		}
		else	// WINDOWS
		{
			if(chdir(GV_RootPath.'tmp/'))
			{
				$cmd = 'start /B /LOW ' . GV_exiftool.' -X -n -fast ' . escapeshellarg($this->filepath) . '';
			}
		}
		if($cmd)
		{
			$s = @shell_exec($cmd);
			if($s!='')
			{
		
				$domrdf = new DOMDocument();
				$domrdf->recover = true;
				$domrdf->preserveWhiteSpace = false;
				
				if($domrdf->loadXML($s))
				{
					$this->uuid = $this->test_rdf_fields($domrdf);
				}
			}
		}
		
		if($this->uuid === false)
		{
			$this->uuid = self::generate_uuid();
		}
		$this->write();
		
		return $this->uuid;
	}
	
	public function is_new_in_base($sbas_id)
	{
		if(!$this->uuid)
			return true;
		
		$connbas = connection::getInstance($sbas_id);
		
		$sql = 'SELECT record_id FROM record WHERE uuid="'.$connbas->escape_string($this->uuid).'"';
		if($rs = $connbas->query($sql))
		{
			if($connbas->num_rows($rs) > 0)
				return false;
			$connbas->free_result($rs);
		}
		
		return true;
	}
	
	public function generate_and_write()
	{
		$this->uuid = self::generate_uuid();
		$this->write();
		
		return $this;
	}
	
	public function write()
	{
		$system = p4utils::getSystem();
		
		if(in_array($system, array('DARWIN', 'LINUX')))
		{
			$cmd = GV_exiftool.' -m -overwrite_original -XMP-exif:ImageUniqueID=\''.$this->uuid.'\' -IPTC:UniqueDocumentID=\''.$this->uuid.'\' ' . escapeshellarg($this->filepath) . '';
		}
		else	// WINDOWS
		{
			if(chdir(GV_RootPath.'tmp/'))
			{
				$cmd = 'start /B /LOW ' . GV_exiftool.' -m -overwrite_original -XMP-exif:ImageUniqueID=\''.$this->uuid.'\' -IPTC:UniqueDocumentID=\''.$this->uuid.'\' ' . escapeshellarg($this->filepath) . '';
			}
		}
		if($cmd)
		{
//			echo "mise ad jour : $cmd \n";
			$s = @shell_exec($cmd);
		}
		return $this;
	}
	
	public static function generate_uuid()
	{
		return phrasea_uuid_create();
	}
	
	
	private function test_rdf_fields($rdf_dom)
	{
		$xptrdf = new DOMXPath($rdf_dom);
		$xptrdf->registerNamespace('XMP-exif', 'http://ns.exiftool.ca/XMP/XMP-exif/1.0/') ;
		$xptrdf->registerNamespace('IPTC', 'http://ns.exiftool.ca/IPTC/IPTC/1.0/') ;
		
		$fields = array(
			'/rdf:RDF/rdf:Description/XMP-exif:ImageUniqueID',
			'/rdf:RDF/rdf:Description/IPTC:UniqueDocumentID'
		);
		
		foreach($fields as $field)
		{
			$x = $xptrdf->query($field);
			
			if($x->length>0)
			{		
				$x = $x->item(0);
				
				$encoding = strtolower($x->getAttribute('rdf:datatype').$x->getAttribute('et:encoding'));
				$base64_encoded = (strpos($encoding,'base64') !== false);
		
				if( ($v = $x->firstChild) && $v->nodeType==XML_TEXT_NODE)
				{
					$value = $base64_encoded ? base64_decode($v->nodeValue) : $v->nodeValue;
					if(self::uuid_is_valid($value))
						return $value;
				}
			}
		}
		return false;
	}
	
	public static function uuid_is_valid($uuid)
	{
		return phrasea_uuid_is_valid($uuid);
	}
	
	public function __get($key)
	{
		if(isset($this->storage[$key]))
		{
			return $this->storage[$key];
		}
		return null;
	}
	
	public function __set($key, $value)
	{
		$this->storage[$key] = $value;
		
		return $this;
	}
	
	public function __isset($key)
	{
		if(isset($this->storage[$key]))
			return true;
		return false;
	}
	
}