<?php

/**
 * ---------------------------------------------------------------------
 *
 * GLPI - Gestionnaire Libre de Parc Informatique
 *
 * http://glpi-project.org
 *
 * @copyright 2015-2026 Teclib' and contributors.
 * @copyright 2003-2014 by the INDEPNET Development Team.
 * @licence   https://www.gnu.org/licenses/gpl-3.0.html
 *
 * ---------------------------------------------------------------------
 *
 * LICENSE
 *
 * This file is part of GLPI.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 * ---------------------------------------------------------------------
 */

namespace Glpi\Console\Database;

use DBmysql;
use Glpi\Console\AbstractCommand;
use Glpi\System\Diagnostic\DatabaseSchemaIntegrityChecker;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;

class CheckSchemaIntegrityCommand extends AbstractCommand
{
    /**
     * Error code returned when empty SQL file is not available / readable.
     *
     * @var integer
     */
    public const ERROR_UNABLE_TO_READ_EMPTYSQL = 1;

    /**
     * Error code returned when differences are found.
     *
     * @var integer
     */
    public const ERROR_FOUND_DIFFERENCES = 2;

    /**
     * Error code returned when a DB update is necessary to be able to perform the check.
     *
     * @var integer
     */
    public const ERROR_REQUIRE_DB_UPDATE = 3;

    /**
     * Error code returned when a DB version is not supported.
     *
     * @var integer
     */
    public const ERROR_UNSUPPORTED_VERSION = 4;

    /**
     * Error code returned when no database connection is available.
     */
    public const ERROR_NO_DB_CONNECTION = 5;

    /**
     * Error code returned when the GLPI version cannot be found.
     */
    public const ERROR_NO_VERSION_FOUND = 6;

    /**
     * Error code returned when no tables are found in the database.
     */
    public const ERROR_NO_TABLES_FOUND = 7;

    protected $requires_db = false;

    protected $requires_db_up_to_date = false;

    protected function configure()
    {
        parent::configure();

        $this->setName('database:check_schema_integrity');
        $this->setAliases(
            [
                'db:check_schema_integrity',
                'database:check', // old name
                'db:check', // old alias
            ]
        );
        $this->setDescription(__('Check for schema differences between current database and installation file.'));

        $this->addOption(
            'strict',
            null,
            InputOption::VALUE_NONE,
            __('Strict comparison of definitions')
        );

        $this->addOption(
            'check-all-migrations',
            null,
            InputOption::VALUE_NONE,
            __('Check tokens related to all databases migrations.')
        );

        $this->addOption(
            'check-innodb-migration',
            null,
            InputOption::VALUE_NONE,
            __('Check tokens related to migration from "MyISAM" to "InnoDB".')
        );

        $this->addOption(
            'check-timestamps-migration',
            null,
            InputOption::VALUE_NONE,
            __('Check tokens related to migration from "datetime" to "timestamp".')
        );

        $this->addOption(
            'check-utf8mb4-migration',
            null,
            InputOption::VALUE_NONE,
            __('Check tokens related to migration from "utf8" to "utf8mb4".')
        );

        $this->addOption(
            'check-dynamic-row-format-migration',
            null,
            InputOption::VALUE_NONE,
            __('Check tokens related to "DYNAMIC" row format migration.')
        );

        $this->addOption(
            'check-unsigned-keys-migration',
            null,
            InputOption::VALUE_NONE,
            __('Check tokens related to migration from signed to unsigned integers in primary/foreign keys.')
        );

        $this->addOption(
            'plugin',
            'p',
            InputOption::VALUE_REQUIRED,
            __('Plugin to check. If option is not used, checks will be done on GLPI core database tables.')
        );
    }

    protected function initDbConnection()
    {
        /** @var \DBmysql $DB */
        global $DB;

        if (!($DB instanceof DBmysql) || !$DB->connected) {
            throw new \Glpi\Console\Exception\EarlyExitException(
                '<error>' . __('Unable to connect to database.') . '</error>',
                self::ERROR_NO_DB_CONNECTION
            );
        }

        parent::initDbConnection();
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        /** @var array $CFG_GLPI */
        global $CFG_GLPI;

        $plugin_key = $input->getOption('plugin');

        $checker = new DatabaseSchemaIntegrityChecker(
            $this->db,
            $input->getOption('strict'),
            !$input->getOption('check-all-migrations') && !$input->getOption('check-innodb-migration'),
            !$input->getOption('check-all-migrations') && !$input->getOption('check-timestamps-migration'),
            !$input->getOption('check-all-migrations') && !$input->getOption('check-utf8mb4-migration'),
            !$input->getOption('check-all-migrations') && !$input->getOption('check-dynamic-row-format-migration'),
            !$input->getOption('check-all-migrations') && !$input->getOption('check-unsigned-keys-migration')
        );

        if ($plugin_key !== null) {
            $context = 'plugin:' . $plugin_key;
            $installed_version = null; // Cannot know installed schema of plugins
        } else {
            $context = 'core';
            $installed_version = $CFG_GLPI['dbversion'] ?? $CFG_GLPI['version'] ?? null; // `dbversion` has been added in GLPI 9.2

            if ($installed_version === null) {
                throw new \Glpi\Console\Exception\EarlyExitException(
                    '<error>' . __('Unable to fetch GLPI version.') . '</error>',
                    self::ERROR_NO_VERSION_FOUND
                );
            }

            // Some versions were stored with unexpected whitespaces.
            // e.g. ` 0.80`, ` 0.80.1`, ...
            $installed_version = trim($installed_version);
        }

        if (!$checker->hasTables($context)) {
            $message = $plugin_key === null
                ? __('The database contains no GLPI tables.')
                : sprintf(__('The database contains no tables of the plugin "%s".'), $plugin_key);
            throw new \Glpi\Console\Exception\EarlyExitException(
                '<error>' . $message . '</error>',
                self::ERROR_NO_TABLES_FOUND
            );
        }

        if (!$checker->canCheckIntegrity($installed_version, $context)) {
            $message = $plugin_key === null
                ? sprintf(__('Checking database integrity of version "%s" is not supported.'), $installed_version)
                : sprintf(__('Checking database integrity of plugin "%s" is not supported.'), $plugin_key);
            throw new \Glpi\Console\Exception\EarlyExitException(
                '<error>' . $message . '</error>',
                self::ERROR_UNSUPPORTED_VERSION
            );
        }

        try {
            $differences = $checker->checkCompleteSchemaForVersion($installed_version, true, $context);
        } catch (\Throwable $e) {
            $output->writeln(
                '<error>' . $e->getMessage() . '</error>',
                OutputInterface::VERBOSITY_QUIET
            );
            return self::ERROR_UNABLE_TO_READ_EMPTYSQL;
        }

        foreach ($differences as $table_name => $difference) {
            $message = null;
            switch ($difference['type']) {
                case DatabaseSchemaIntegrityChecker::RESULT_TYPE_ALTERED_TABLE:
                    $message = sprintf(__('Table schema differs for table "%s".'), $table_name);
                    break;
                case DatabaseSchemaIntegrityChecker::RESULT_TYPE_MISSING_TABLE:
                    $message = sprintf(__('Table "%s" is missing.'), $table_name);
                    break;
                case DatabaseSchemaIntegrityChecker::RESULT_TYPE_UNKNOWN_TABLE:
                    $message = sprintf(__('Unknown table "%s" has been found in database.'), $table_name);
                    break;
            }
            $output->writeln(
                '<info>' . $message . '</info>',
                OutputInterface::VERBOSITY_QUIET
            );
            $output->write($difference['diff']);
        }

        if (count($differences) > 0) {
            return self::ERROR_FOUND_DIFFERENCES;
        }

        $output->writeln('<info>' . __('Database schema is OK.') . '</info>');

        return 0; // Success
    }
}
