<?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 LGPL. For more information, see
 * <http://www.doctrine-project.org>.
 */

namespace Doctrine\DBAL\Migrations\Configuration\Connection\Loader;


use Doctrine\DBAL\Connection;
use Doctrine\DBAL\Migrations\Configuration\Connection\ConnectionLoaderInterface;
use Doctrine\DBAL\Tools\Console\Helper\ConnectionHelper;
use Symfony\Component\Console\Helper\HelperSet;

class ConnectionHelperLoader implements ConnectionLoaderInterface
{
    /**
     * @var string
     */
    private $helperName;

    /** @var  HelperSet */
    private $helperSet;


    /**
     * ConnectionHelperLoader constructor.
     * @param HelperSet $helperSet
     * @param string $helperName
     */
    public function __construct(HelperSet $helperSet = null, $helperName)
    {
        $this->helperName = $helperName;
        if ($helperSet === null) {
            $helperSet = new HelperSet();
        }
        $this->helperSet = $helperSet;
    }

    /**
     * read the input and return a Configuration, returns `false` if the config
     * is not supported
     * @return Connection|null
     */
    public function chosen()
    {
        if ($this->helperSet->has($this->helperName)) {
            $connectionHelper = $this->helperSet->get($this->helperName);
            if ($connectionHelper instanceof ConnectionHelper) {

                return $connectionHelper->getConnection();
            }
        }

        return null;
    }
}