<?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\Driver;

use Doctrine\DBAL\DBALException;
use Doctrine\DBAL\Driver;
use Doctrine\DBAL\Exception;
use Doctrine\DBAL\Platforms\PostgreSQL91Platform;
use Doctrine\DBAL\Platforms\PostgreSQL92Platform;
use Doctrine\DBAL\Platforms\PostgreSQL94Platform;
use Doctrine\DBAL\Platforms\PostgreSqlPlatform;
use Doctrine\DBAL\Schema\PostgreSqlSchemaManager;
use Doctrine\DBAL\VersionAwarePlatformDriver;

/**
 * Abstract base implementation of the {@link Doctrine\DBAL\Driver} interface for PostgreSQL based drivers.
 *
 * @author Steve Müller <st.mueller@dzh-online.de>
 * @link   www.doctrine-project.org
 * @since  2.5
 */
abstract class AbstractPostgreSQLDriver implements Driver, ExceptionConverterDriver, VersionAwarePlatformDriver
{
    /**
     * {@inheritdoc}
     *
     * @link http://www.postgresql.org/docs/9.3/static/errcodes-appendix.html
     */
    public function convertException($message, DriverException $exception)
    {
        switch ($exception->getSQLState()) {
            case '40001':
            case '40P01':
                return new Exception\DeadlockException($message, $exception);
            case '0A000':
                // Foreign key constraint violations during a TRUNCATE operation
                // are considered "feature not supported" in PostgreSQL.
                if (strpos($exception->getMessage(), 'truncate') !== false) {
                    return new Exception\ForeignKeyConstraintViolationException($message, $exception);
                }

                break;
            case '23502':
                return new Exception\NotNullConstraintViolationException($message, $exception);

            case '23503':
                return new Exception\ForeignKeyConstraintViolationException($message, $exception);

            case '23505':
                return new Exception\UniqueConstraintViolationException($message, $exception);

            case '42601':
                return new Exception\SyntaxErrorException($message, $exception);

            case '42702':
                return new Exception\NonUniqueFieldNameException($message, $exception);

            case '42703':
                return new Exception\InvalidFieldNameException($message, $exception);

            case '42P01':
                return new Exception\TableNotFoundException($message, $exception);

            case '42P07':
                return new Exception\TableExistsException($message, $exception);

            case '7':
                // In some case (mainly connection errors) the PDO exception does not provide a SQLSTATE via its code.
                // The exception code is always set to 7 here.
                // We have to match against the SQLSTATE in the error message in these cases.
                if (strpos($exception->getMessage(), 'SQLSTATE[08006]') !== false) {
                    return new Exception\ConnectionException($message, $exception);
                }

                break;
        }

        return new Exception\DriverException($message, $exception);
    }

    /**
     * {@inheritdoc}
     */
    public function createDatabasePlatformForVersion($version)
    {
        if ( ! preg_match('/^(?P<major>\d+)(?:\.(?P<minor>\d+)(?:\.(?P<patch>\d+))?)?/', $version, $versionParts)) {
            throw DBALException::invalidPlatformVersionSpecified(
                $version,
                '<major_version>.<minor_version>.<patch_version>'
            );
        }

        $majorVersion = $versionParts['major'];
        $minorVersion = isset($versionParts['minor']) ? $versionParts['minor'] : 0;
        $patchVersion = isset($versionParts['patch']) ? $versionParts['patch'] : 0;
        $version      = $majorVersion . '.' . $minorVersion . '.' . $patchVersion;

        switch(true) {
            case version_compare($version, '9.4', '>='):
                return new PostgreSQL94Platform();
            case version_compare($version, '9.2', '>='):
                return new PostgreSQL92Platform();
            case version_compare($version, '9.1', '>='):
                return new PostgreSQL91Platform();
            default:
                return new PostgreSqlPlatform();
        }
    }

    /**
     * {@inheritdoc}
     */
    public function getDatabase(\Doctrine\DBAL\Connection $conn)
    {
        $params = $conn->getParams();

        return (isset($params['dbname']))
            ? $params['dbname']
            : $conn->query('SELECT CURRENT_DATABASE()')->fetchColumn();
    }

    /**
     * {@inheritdoc}
     */
    public function getDatabasePlatform()
    {
        return new PostgreSqlPlatform();
    }

    /**
     * {@inheritdoc}
     */
    public function getSchemaManager(\Doctrine\DBAL\Connection $conn)
    {
        return new PostgreSqlSchemaManager($conn);
    }
}