<?php
/*
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license. For more information, see
 * <http://www.doctrine-project.org>.
 */

namespace Doctrine\ODM\MongoDB\Query;

use Doctrine\ODM\MongoDB\DocumentManager;
use Doctrine\ODM\MongoDB\Mapping\ClassMetadata;

/**
 * Query expression builder for ODM.
 *
 * @since       1.0
 * @author      Jonathan H. Wage <jonwage@gmail.com>
 */
class Expr extends \Doctrine\MongoDB\Query\Expr
{
    /**
     * The DocumentManager instance for this query
     *
     * @var DocumentManager
     */
    private $dm;

    /**
     * The ClassMetadata instance for the document being queried
     *
     * @var ClassMetadata
     */
    private $class;

    public function __construct(DocumentManager $dm)
    {
        $this->dm = $dm;
    }

    public function setClassMetadata(ClassMetadata $class)
    {
        $this->class = $class;
    }

    /**
     * Checks that the value of the current field is a reference to the supplied document.
     */
    public function references($document)
    {
        if ($this->currentField) {
            $mapping = $this->class->getFieldMapping($this->currentField);
            $dbRef = $this->dm->createDBRef($document, $mapping);

            if (isset($mapping['simple']) && $mapping['simple']) {
                $this->query[$mapping['name']] = $dbRef;
            } else {
                $keys = array('ref' => true, 'id' => true, 'db' => true);

                if (isset($mapping['targetDocument'])) {
                    unset($keys['ref'], $keys['db']);
                }

                foreach ($keys as $key => $value) {
                    $this->query[$this->currentField . '.$' . $key] = $dbRef['$' . $key];
                }
            }
        } else {
            $dbRef = $this->dm->createDBRef($document);
            $this->query = $dbRef;
        }

        return $this;
    }

    /**
     * Checks that the current field includes a reference to the supplied document.
     */
    public function includesReferenceTo($document)
    {
        if ($this->currentField) {
            $mapping = $this->class->getFieldMapping($this->currentField);
            $dbRef = $this->dm->createDBRef($document, $mapping);

            if (isset($mapping['simple']) && $mapping['simple']) {
                $this->query[$mapping['name']]['$elemMatch'] = $dbRef;
            } else {
                $keys = array('ref' => true, 'id' => true, 'db' => true);

                if (isset($mapping['targetDocument'])) {
                    unset($keys['ref'], $keys['db']);
                }

                foreach ($keys as $key => $value) {
                    $this->query[$this->currentField]['$elemMatch']['$' . $key] = $dbRef['$' . $key];
                }
            }
        } else {
            $dbRef = $this->dm->createDBRef($document);
            $this->query['$elemMatch'] = $dbRef;
        }

        return $this;
    }

    public function getQuery()
    {
        return $this->dm->getUnitOfWork()
            ->getDocumentPersister($this->class->name)
            ->prepareQueryOrNewObj($this->query);
    }

    public function getNewObj()
    {
        return $this->dm->getUnitOfWork()
            ->getDocumentPersister($this->class->name)
            ->prepareQueryOrNewObj($this->newObj);
    }
}