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<?php

namespace UnicaenAuth\Authentication\Storage;

use UnicaenAuth\Options\AuthenticationOptionsInterface;
use Zend\Authentication\Exception\InvalidArgumentException;
use Zend\Authentication\Storage;
use Zend\ServiceManager\ServiceManager;
use Zend\ServiceManager\ServiceManagerAwareInterface;

/**
 * Ldap/Db mixin authentification storage.
 *
 * @see Ldap
 * @see Db
 * @author Bertrand GAUTHIER <bertrand.gauthier at unicaen.fr>
 */
class Mixed implements Storage\StorageInterface, ServiceManagerAwareInterface
{
    /**
     * @var ServiceManager
     */
    protected $serviceManager;
    
    /**
     * @var Ldap
     */
    protected $ldapStorage;
    
    /**
     * @var Db
     */
    protected $dbStorage;

    /**
     * @var AuthenticationOptionsInterface
     */
    protected $options;

    /**
     * Returns true if and only if storage is empty
     *
     * @throws InvalidArgumentException If it is impossible to determine whether storage is empty
     * @return boolean
     */
    public function isEmpty()
    {
        if (!$this->getLdapStorage()->isEmpty()) {
            return false;
        }
        if (!$this->getDbStorage()->isEmpty()) {
            return false;
        }
        return true;
    }

    /**
     * Returns the contents of storage
     *
     * Behavior is undefined when storage is empty.
     *
     * @throws InvalidArgumentException If reading contents from storage is impossible
     * @return \ZfcUser\Entity\UserInterface
     */
    public function read()
    {
        $identity = null;
        $userId = null;
        if (($dbIdentity = $this->getDbStorage()->read())) {
            $userId = $dbIdentity->getId();
            $identity = $dbIdentity;
        }
        // moyen de savoir si l'utilisateur a été créé à partir de l'annuaire LDAP: mdp = 'ldap' dans la table
        if (!$dbIdentity || $dbIdentity->getPassword() == 'ldap') {
            $ldapIdentity = $this->getLdapStorage()->read();
            $identity = new \UnicaenAuth\Entity\Ldap\PeopleAdapter($ldapIdentity, $userId);
        }
        return $identity;
    }

    /**
     * Writes $contents to storage
     *
     * @param  mixed $contents
     * @throws InvalidArgumentException If writing $contents to storage is impossible
     * @return void
     */
    public function write($contents)
    {
        $this->getLdapStorage()->write($contents);
        $this->getDbStorage()->write($contents);
    }

    /**
     * Clears contents from storage
     *
     * @throws InvalidArgumentException If clearing contents from storage is impossible
     * @return void
     */
    public function clear()
    {
        $this->getLdapStorage()->clear();
        $this->getDbStorage()->clear();
    }

    /**
     * Retrieve service manager instance
     *
     * @return ServiceManager
     */
    public function getServiceManager()
    {
        return $this->serviceManager;
    }

    /**
     * Set service manager
     *
     * @param ServiceManager $serviceManager
     * @return Ldap
     */
    public function setServiceManager(ServiceManager $serviceManager)
    {
        $this->serviceManager = $serviceManager;
        return $this;
    }

    /**
     * get db Storage
     *
     * @return Db
     */
    public function getDbStorage()
    {
        return $this->dbStorage;
    }

    /**
     * set db Storage
     *
     * @param Db $storage
     * @access public
     * @return Mixed
     */
    public function setDbStorage(Db $storage)
    {
        $this->dbStorage = $storage;
        return $this;
    }

    /**
     * get ldap Storage
     *
     * @return Ldap
     */
    public function getLdapStorage()
    {
        return $this->ldapStorage;
    }

    /**
     * set ldap Storage
     *
     * @param Ldap $storage
     * @access public
     * @return Mixed
     */
    public function setLdapStorage(Ldap $storage)
    {
        $this->ldapStorage = $storage;
        return $this;
    }

    /**
     * @param AuthenticationOptionsInterface $options
     */
    public function setOptions(AuthenticationOptionsInterface $options)
    {
        $this->options = $options;
    }

    /**
     * @return AuthenticationOptionsInterface
     */
    public function getOptions()
    {
        if (!$this->options instanceof AuthenticationOptionsInterface) {
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            $this->setOptions($this->getServiceManager()->get('unicaen-auth_module_options'));
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        }
        return $this->options;
    }
}