<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle 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.
//
// Moodle 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 Moodle.  If not, see <http://www.gnu.org/licenses/>.
//
// Sometimes, changes between versions involve
// alterations to database structures and other
// major things that may break installations.
//
// The upgrade function in this file will attempt
// to perform all the necessary actions to upgrade
// your older installation to the current version.
//
// If there's something it cannot do itself, it
// will tell you what you need to do.
//
// The commands in here will all be database-neutral,
// using the methods of database_manager class
//
// Please do not forget to use upgrade_set_timeout()
// before any action that may take longer time to finish.

/**
 * This file keeps track of upgrades to the game module
 *
 * @package    mmogametype_quiz
 * @copyright  2024 Vasilis Daloukas
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

/**
 * Repair queries (use questionbankentryid instead of questionid).
 */
function mmogametype_quiz_repair_queries() {
    global $DB;

    // Start atomic transaction (ensures update consistency).
    $tx = $DB->start_delegated_transaction();

    $tables = ['mmogame_quiz_attempts', 'mmogame_aa_stats'];
    foreach ($tables as $table) {
        $sql = 'UPDATE {'.$table.'} a
            SET queryid = (
                SELECT v.questionbankentryid
                FROM {question_versions} v
                WHERE v.questionid = a.queryid
            )
            WHERE EXISTS (
                SELECT 1
                FROM {question_versions} v
                WHERE v.questionid = a.queryid
            )
            AND queryid <> (
                SELECT v.questionbankentryid
                FROM {question_versions} v
                WHERE v.questionid = a.queryid)';
        $DB->execute($sql);
    }
    // Commit (will auto-rollback on exception).
    $tx->allow_commit();
}


/**
 * Upgrades database
 *
 * @param string $oldversion
 * @return true
 * @throws ddl_change_structure_exception
 * @throws ddl_exception
 * @throws ddl_field_missing_exception
 * @throws ddl_table_missing_exception
 * @throws downgrade_exception
 * @throws moodle_exception
 * @throws upgrade_exception
 */
function xmldb_mmogametype_quiz_upgrade( string $oldversion): bool {

    global $DB;

    $dbman = $DB->get_manager();

    if ($oldversion < ($ver = 2024103002)) {
        $table = new xmldb_table('mmogame_quiz_attempts');
        $index = new xmldb_index('ginstanceidnumattempt', XMLDB_INDEX_NOTUNIQUE, ['ginstanceid', 'numattempt']);

        if ($dbman->index_exists($table, $index)) {
            $dbman->drop_index($table, $index);
        }

        $index = new xmldb_index('mmogameidnumattempt', XMLDB_INDEX_NOTUNIQUE, ['mmogameid', 'numattempt']);

        if (!$DB->get_manager()->index_exists($table, $index)) {
            $DB->get_manager()->add_index($table, $index);
        }

         upgrade_plugin_savepoint(true, $ver, 'mmogametype', 'quiz');
    }

    if ($oldversion < ($ver = 2024103003)) {
        mmogametype_quiz_repair_queries();
        upgrade_plugin_savepoint(true, $ver, 'mmogametype', 'quiz');
    }

    if ($oldversion < ($ver = 2025081901)) {
        $table = new xmldb_table('mmogame_quiz_attempts');
        $index = new xmldb_index('mdl_mmogquizatte_ginnumtim_ix', XMLDB_INDEX_NOTUNIQUE, ['ginstanceid', 'numgame', 'timeanswer']);

        if ($dbman->index_exists($table, $index)) {
            $dbman->drop_index($table, $index);
        }

        $field = new xmldb_field('ginstanceid');

        if ($dbman->field_exists($table, $field)) {
            $dbman->drop_field($table, $field);
        }

        // Define field numgame to be added to mmogame.
        $table = new xmldb_table('mmogame_quiz_attempts');
        $field = new xmldb_field('numquery', XMLDB_TYPE_INTEGER, '10', null, null, null, null, 'numattempt');

        if (!$dbman->field_exists($table, $field)) {
            $dbman->add_field($table, $field);
        }
        upgrade_plugin_savepoint(true, $ver, 'mmogametype', 'quiz');
    }

    if ($oldversion < ($ver = 2025082817)) {
        // Rename model value 'aduelsplit' -> 'split' safely using DML helper.
        $DB->set_field('mmogame', 'model', 'split', ['type' => 'quiz', 'model' => 'aduelsplit']);

        upgrade_plugin_savepoint(true, $ver, 'mmogametype', 'quiz');
    }

    if ($oldversion < ($ver = 2025110100)) {
        // Define field numattempt to be added to mmogame.
        $table = new xmldb_table('mmogame_quiz_attempts');
        $field = new xmldb_field('theta', XMLDB_TYPE_FLOAT);

        if (!$dbman->field_exists($table, $field)) {
            $dbman->add_field($table, $field);
        }
        upgrade_plugin_savepoint(true, $ver, 'mmogametype', 'quiz');
    }

    if ($oldversion < ($ver = 2025110101)) {
        // Define field numattempt to be added to mmogame.
        $table = new xmldb_table('mmogame_quiz_attempts');
        $field = new xmldb_field('difficulty', XMLDB_TYPE_FLOAT);

        if (!$dbman->field_exists($table, $field)) {
            $dbman->add_field($table, $field);
        }
        upgrade_plugin_savepoint(true, $ver, 'mmogametype', 'quiz');
    }

    if ($oldversion < ($ver = 2025110200)) {
        // Define field numattempt to be added to mmogame.
        $table = new xmldb_table('mmogame_quiz_attempts');
        $field = new xmldb_field('tools', XMLDB_TYPE_INTEGER, 2, null, true, null, 0);

        if (!$dbman->field_exists($table, $field)) {
            $dbman->add_field($table, $field);
        }
        upgrade_plugin_savepoint(true, $ver, 'mmogametype', 'quiz');
    }

    return true;
}
