<?php

/**
 * Matomo - free/libre analytics platform
 *
 * @link    https://matomo.org
 * @license https://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
 */
namespace Piwik\Db\Schema;

/**
 * Mariadb schema
 */
class Tidb extends \Piwik\Db\Schema\Mysql
{
    public function getDatabaseType() : string
    {
        return 'TiDb';
    }
    /**
     * TiDB performs a sanity check before performing e.g. ALTER TABLE statements. If any of the used columns does not
     * exist before the query fails. This also happens if the column would be added in the same query.
     *
     */
    public function supportsComplexColumnUpdates() : bool
    {
        return \false;
    }
    public function getDefaultCollationForCharset(string $charset) : string
    {
        $collation = parent::getDefaultCollationForCharset($charset);
        if ('utf8mb4' === $charset && 'utf8mb4_bin' === $collation) {
            // replace the TiDB default "utf8mb4_bin" with a better default
            return 'utf8mb4_0900_ai_ci';
        }
        return $collation;
    }
    public function getDefaultPort() : int
    {
        return 4000;
    }
    public function getTableCreateOptions() : string
    {
        $engine = $this->getTableEngine();
        $charset = $this->getUsedCharset();
        $collation = $this->getUsedCollation();
        $rowFormat = $this->getTableRowFormat();
        if ('utf8mb4' === $charset && '' === $collation) {
            $collation = 'utf8mb4_0900_ai_ci';
        }
        $options = "ENGINE={$engine} DEFAULT CHARSET={$charset}";
        if ('' !== $collation) {
            $options .= " COLLATE={$collation}";
        }
        if ('' !== $rowFormat) {
            $options .= " {$rowFormat}";
        }
        return $options;
    }
    public function isOptimizeInnoDBSupported() : bool
    {
        return \false;
    }
    public function optimizeTables(array $tables, bool $force = \false) : bool
    {
        // OPTIMIZE TABLE not supported for TiDb
        return \false;
    }
    public function supportsSortingInSubquery() : bool
    {
        // TiDb optimizer removes all sorting from subqueries
        return \false;
    }
    public function getSupportedReadIsolationTransactionLevel() : string
    {
        // TiDB doesn't support READ UNCOMMITTED
        return 'READ COMMITTED';
    }
    public function hasReachedEOL() : bool
    {
        // ignore in EOL checks
        return \false;
    }
}