<?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\DBAL\Types;

use Doctrine\DBAL\Platforms\AbstractPlatform;

/**
 * DateTime type saving additional timezone information.
 *
 * Caution: Databases are not necessarily experts at storing timezone related
 * data of dates. First, of all the supported vendors only PostgreSQL and Oracle
 * support storing Timezone data. But those two don't save the actual timezone
 * attached to a DateTime instance (for example "Europe/Berlin" or "America/Montreal")
 * but the current offset of them related to UTC. That means depending on daylight saving times
 * or not you may get different offsets.
 *
 * This datatype makes only sense to use, if your application works with an offset, not
 * with an actual timezone that uses transitions. Otherwise your DateTime instance
 * attached with a timezone such as Europe/Berlin gets saved into the database with
 * the offset and re-created from persistence with only the offset, not the original timezone
 * attached.
 *
 * @link    www.doctrine-project.org
 * @since   1.0
 * @author  Benjamin Eberlei <kontakt@beberlei.de>
 * @author  Guilherme Blanco <guilhermeblanco@hotmail.com>
 * @author  Jonathan Wage <jonwage@gmail.com>
 * @author  Roman Borschel <roman@code-factory.org>
 */
class DateTimeTzType extends Type
{
    /**
     * {@inheritdoc}
     */
    public function getName()
    {
        return Type::DATETIMETZ;
    }

    /**
     * {@inheritdoc}
     */
    public function getSQLDeclaration(array $fieldDeclaration, AbstractPlatform $platform)
    {
        return $platform->getDateTimeTzTypeDeclarationSQL($fieldDeclaration);
    }

    /**
     * {@inheritdoc}
     */
    public function convertToDatabaseValue($value, AbstractPlatform $platform)
    {
        return ($value !== null)
            ? $value->format($platform->getDateTimeTzFormatString()) : null;
    }

    /**
     * {@inheritdoc}
     */
    public function convertToPHPValue($value, AbstractPlatform $platform)
    {
        if ($value === null || $value instanceof \DateTime) {
            return $value;
        }

        $val = \DateTime::createFromFormat($platform->getDateTimeTzFormatString(), $value);
        if ( ! $val) {
            throw ConversionException::conversionFailedFormat($value, $this->getName(), $platform->getDateTimeTzFormatString());
        }

        return $val;
    }
}
