MDL-46455 backup: Implement backup of standard logstore

[moodle.git] / backup / moodle2 / restore_stepslib.php

<?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/>.

/**
 * Defines various restore steps that will be used by common tasks in restore
 *
 * @package     core_backup
 * @subpackage  moodle2
 * @category    backup
 * @copyright   2010 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}
 * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

/**
 * delete old directories and conditionally create backup_temp_ids table
 */
class restore_create_and_clean_temp_stuff extends restore_execution_step {

    protected function define_execution() {
        $exists = restore_controller_dbops::create_restore_temp_tables($this->get_restoreid()); // temp tables conditionally
        // If the table already exists, it's because restore_prechecks have been executed in the same
        // request (without problems) and it already contains a bunch of preloaded information (users...)
        // that we aren't going to execute again
        if ($exists) { // Inform plan about preloaded information
            $this->task->set_preloaded_information();
        }
        // Create the old-course-ctxid to new-course-ctxid mapping, we need that available since the beginning
        $itemid = $this->task->get_old_contextid();
        $newitemid = context_course::instance($this->get_courseid())->id;
        restore_dbops::set_backup_ids_record($this->get_restoreid(), 'context', $itemid, $newitemid);
        // Create the old-system-ctxid to new-system-ctxid mapping, we need that available since the beginning
        $itemid = $this->task->get_old_system_contextid();
        $newitemid = context_system::instance()->id;
        restore_dbops::set_backup_ids_record($this->get_restoreid(), 'context', $itemid, $newitemid);
        // Create the old-course-id to new-course-id mapping, we need that available since the beginning
        $itemid = $this->task->get_old_courseid();
        $newitemid = $this->get_courseid();
        restore_dbops::set_backup_ids_record($this->get_restoreid(), 'course', $itemid, $newitemid);

    }
}

/**
 * delete the temp dir used by backup/restore (conditionally),
 * delete old directories and drop temp ids table
 */
class restore_drop_and_clean_temp_stuff extends restore_execution_step {

    protected function define_execution() {
        global $CFG;
        restore_controller_dbops::drop_restore_temp_tables($this->get_restoreid()); // Drop ids temp table
        $progress = $this->task->get_progress();
        $progress->start_progress('Deleting backup dir');
        backup_helper::delete_old_backup_dirs(strtotime('-1 week'), $progress);      // Delete > 1 week old temp dirs.
        if (empty($CFG->keeptempdirectoriesonbackup)) { // Conditionally
            backup_helper::delete_backup_dir($this->task->get_tempdir(), $progress); // Empty restore dir
        }
        $progress->end_progress();
    }
}

/**
 * Restore calculated grade items, grade categories etc
 */
class restore_gradebook_structure_step extends restore_structure_step {

    /**
     * To conditionally decide if this step must be executed
     * Note the "settings" conditions are evaluated in the
     * corresponding task. Here we check for other conditions
     * not being restore settings (files, site settings...)
     */
     protected function execute_condition() {
        global $CFG, $DB;

        if ($this->get_courseid() == SITEID) {
            return false;
        }

        // No gradebook info found, don't execute
        $fullpath = $this->task->get_taskbasepath();
        $fullpath = rtrim($fullpath, '/') . '/' . $this->filename;
        if (!file_exists($fullpath)) {
            return false;
        }

        // Some module present in backup file isn't available to restore
        // in this site, don't execute
        if ($this->task->is_missing_modules()) {
            return false;
        }

        // Some activity has been excluded to be restored, don't execute
        if ($this->task->is_excluding_activities()) {
            return false;
        }

        // There should only be one grade category (the 1 associated with the course itself)
        // If other categories already exist we're restoring into an existing course.
        // Restoring categories into a course with an existing category structure is unlikely to go well
        $category = new stdclass();
        $category->courseid  = $this->get_courseid();
        $catcount = $DB->count_records('grade_categories', (array)$category);
        if ($catcount>1) {
            return false;
        }

        // Arrived here, execute the step
        return true;
     }

    protected function define_structure() {
        $paths = array();
        $userinfo = $this->task->get_setting_value('users');

        $paths[] = new restore_path_element('gradebook', '/gradebook');
        $paths[] = new restore_path_element('grade_category', '/gradebook/grade_categories/grade_category');
        $paths[] = new restore_path_element('grade_item', '/gradebook/grade_items/grade_item');
        if ($userinfo) {
            $paths[] = new restore_path_element('grade_grade', '/gradebook/grade_items/grade_item/grade_grades/grade_grade');
        }
        $paths[] = new restore_path_element('grade_letter', '/gradebook/grade_letters/grade_letter');
        $paths[] = new restore_path_element('grade_setting', '/gradebook/grade_settings/grade_setting');

        return $paths;
    }

    protected function process_gradebook($data) {
        // For non-merge restore types:
        // Unset 'gradebook_calculations_freeze_' in the course and replace with the one from the backup.
        $target = $this->get_task()->get_target();
        if ($target == backup::TARGET_CURRENT_DELETING || $target == backup::TARGET_EXISTING_DELETING) {
            set_config('gradebook_calculations_freeze_' . $this->get_courseid(), null);
        }
        if (!empty($data['calculations_freeze'])) {
            if ($target == backup::TARGET_NEW_COURSE || $target == backup::TARGET_CURRENT_DELETING ||
                    $target == backup::TARGET_EXISTING_DELETING) {
                set_config('gradebook_calculations_freeze_' . $this->get_courseid(), $data['calculations_freeze']);
            }
        }
    }

    protected function process_grade_item($data) {
        global $DB;

        $data = (object)$data;

        $oldid = $data->id;
        $data->course = $this->get_courseid();

        $data->courseid = $this->get_courseid();

        if ($data->itemtype=='manual') {
            // manual grade items store category id in categoryid
            $data->categoryid = $this->get_mappingid('grade_category', $data->categoryid, NULL);
            // if mapping failed put in course's grade category
            if (NULL == $data->categoryid) {
                $coursecat = grade_category::fetch_course_category($this->get_courseid());
                $data->categoryid = $coursecat->id;
            }
        } else if ($data->itemtype=='course') {
            // course grade item stores their category id in iteminstance
            $coursecat = grade_category::fetch_course_category($this->get_courseid());
            $data->iteminstance = $coursecat->id;
        } else if ($data->itemtype=='category') {
            // category grade items store their category id in iteminstance
            $data->iteminstance = $this->get_mappingid('grade_category', $data->iteminstance, NULL);
        } else {
            throw new restore_step_exception('unexpected_grade_item_type', $data->itemtype);
        }

        $data->scaleid   = $this->get_mappingid('scale', $data->scaleid, NULL);
        $data->outcomeid = $this->get_mappingid('outcome', $data->outcomeid, NULL);

        $data->locktime     = $this->apply_date_offset($data->locktime);
        $data->timecreated  = $this->apply_date_offset($data->timecreated);
        $data->timemodified = $this->apply_date_offset($data->timemodified);

        $coursecategory = $newitemid = null;
        //course grade item should already exist so updating instead of inserting
        if($data->itemtype=='course') {
            //get the ID of the already created grade item
            $gi = new stdclass();
            $gi->courseid  = $this->get_courseid();
            $gi->itemtype  = $data->itemtype;

            //need to get the id of the grade_category that was automatically created for the course
            $category = new stdclass();
            $category->courseid  = $this->get_courseid();
            $category->parent  = null;
            //course category fullname starts out as ? but may be edited
            //$category->fullname  = '?';
            $coursecategory = $DB->get_record('grade_categories', (array)$category);
            $gi->iteminstance = $coursecategory->id;

            $existinggradeitem = $DB->get_record('grade_items', (array)$gi);
            if (!empty($existinggradeitem)) {
                $data->id = $newitemid = $existinggradeitem->id;
                $DB->update_record('grade_items', $data);
            }
        } else if ($data->itemtype == 'manual') {
            // Manual items aren't assigned to a cm, so don't go duplicating them in the target if one exists.
            $gi = array(
                'itemtype' => $data->itemtype,
                'courseid' => $data->courseid,
                'itemname' => $data->itemname,
                'categoryid' => $data->categoryid,
            );
            $newitemid = $DB->get_field('grade_items', 'id', $gi);
        }

        if (empty($newitemid)) {
            //in case we found the course category but still need to insert the course grade item
            if ($data->itemtype=='course' && !empty($coursecategory)) {
                $data->iteminstance = $coursecategory->id;
            }

            $newitemid = $DB->insert_record('grade_items', $data);
        }
        $this->set_mapping('grade_item', $oldid, $newitemid);
    }

    protected function process_grade_grade($data) {
        global $DB;

        $data = (object)$data;
        $oldid = $data->id;
        $olduserid = $data->userid;

        $data->itemid = $this->get_new_parentid('grade_item');

        $data->userid = $this->get_mappingid('user', $data->userid, null);
        if (!empty($data->userid)) {
            $data->usermodified = $this->get_mappingid('user', $data->usermodified, null);
            $data->locktime     = $this->apply_date_offset($data->locktime);
            // TODO: Ask, all the rest of locktime/exported... work with time... to be rolled?
            $data->overridden = $this->apply_date_offset($data->overridden);
            $data->timecreated  = $this->apply_date_offset($data->timecreated);
            $data->timemodified = $this->apply_date_offset($data->timemodified);

            $gradeexists = $DB->record_exists('grade_grades', array('userid' => $data->userid, 'itemid' => $data->itemid));
            if ($gradeexists) {
                $message = "User id '{$data->userid}' already has a grade entry for grade item id '{$data->itemid}'";
                $this->log($message, backup::LOG_DEBUG);
            } else {
                $newitemid = $DB->insert_record('grade_grades', $data);
                $this->set_mapping('grade_grades', $oldid, $newitemid);
            }
        } else {
            $message = "Mapped user id not found for user id '{$olduserid}', grade item id '{$data->itemid}'";
            $this->log($message, backup::LOG_DEBUG);
        }
    }

    protected function process_grade_category($data) {
        global $DB;

        $data = (object)$data;
        $oldid = $data->id;

        $data->course = $this->get_courseid();
        $data->courseid = $data->course;

        $data->timecreated  = $this->apply_date_offset($data->timecreated);
        $data->timemodified = $this->apply_date_offset($data->timemodified);

        $newitemid = null;
        //no parent means a course level grade category. That may have been created when the course was created
        if(empty($data->parent)) {
            //parent was being saved as 0 when it should be null
            $data->parent = null;

            //get the already created course level grade category
            $category = new stdclass();
            $category->courseid = $this->get_courseid();
            $category->parent = null;

            $coursecategory = $DB->get_record('grade_categories', (array)$category);
            if (!empty($coursecategory)) {
                $data->id = $newitemid = $coursecategory->id;
                $DB->update_record('grade_categories', $data);
            }
        }

        // Add a warning about a removed setting.
        if (!empty($data->aggregatesubcats)) {
            set_config('show_aggregatesubcats_upgrade_' . $data->courseid, 1);
        }

        //need to insert a course category
        if (empty($newitemid)) {
            $newitemid = $DB->insert_record('grade_categories', $data);
        }
        $this->set_mapping('grade_category', $oldid, $newitemid);
    }
    protected function process_grade_letter($data) {
        global $DB;

        $data = (object)$data;
        $oldid = $data->id;

        $data->contextid = context_course::instance($this->get_courseid())->id;

        $gradeletter = (array)$data;
        unset($gradeletter['id']);
        if (!$DB->record_exists('grade_letters', $gradeletter)) {
            $newitemid = $DB->insert_record('grade_letters', $data);
        } else {
            $newitemid = $data->id;
        }

        $this->set_mapping('grade_letter', $oldid, $newitemid);
    }
    protected function process_grade_setting($data) {
        global $DB;

        $data = (object)$data;
        $oldid = $data->id;

        $data->courseid = $this->get_courseid();

        $target = $this->get_task()->get_target();
        if ($data->name == 'minmaxtouse' &&
                ($target == backup::TARGET_CURRENT_ADDING || $target == backup::TARGET_EXISTING_ADDING)) {
            // We never restore minmaxtouse during merge.
            return;
        }

        if (!$DB->record_exists('grade_settings', array('courseid' => $data->courseid, 'name' => $data->name))) {
            $newitemid = $DB->insert_record('grade_settings', $data);
        } else {
            $newitemid = $data->id;
        }

        if (!empty($oldid)) {
            // In rare cases (minmaxtouse), it is possible that there wasn't any ID associated with the setting.
            $this->set_mapping('grade_setting', $oldid, $newitemid);
        }
    }

    /**
     * put all activity grade items in the correct grade category and mark all for recalculation
     */
    protected function after_execute() {
        global $DB;

        $conditions = array(
            'backupid' => $this->get_restoreid(),
            'itemname' => 'grade_item'//,
            //'itemid'   => $itemid
        );
        $rs = $DB->get_recordset('backup_ids_temp', $conditions);

        // We need this for calculation magic later on.
        $mappings = array();

        if (!empty($rs)) {
            foreach($rs as $grade_item_backup) {

                // Store the oldid with the new id.
                $mappings[$grade_item_backup->itemid] = $grade_item_backup->newitemid;

                $updateobj = new stdclass();
                $updateobj->id = $grade_item_backup->newitemid;

                //if this is an activity grade item that needs to be put back in its correct category
                if (!empty($grade_item_backup->parentitemid)) {
                    $oldcategoryid = $this->get_mappingid('grade_category', $grade_item_backup->parentitemid, null);
                    if (!is_null($oldcategoryid)) {
                        $updateobj->categoryid = $oldcategoryid;
                        $DB->update_record('grade_items', $updateobj);
                    }
                } else {
                    //mark course and category items as needing to be recalculated
                    $updateobj->needsupdate=1;
                    $DB->update_record('grade_items', $updateobj);
                }
            }
        }
        $rs->close();

        // We need to update the calculations for calculated grade items that may reference old
        // grade item ids using ##gi\d+##.
        // $mappings can be empty, use 0 if so (won't match ever)
        list($sql, $params) = $DB->get_in_or_equal(array_values($mappings), SQL_PARAMS_NAMED, 'param', true, 0);
        $sql = "SELECT gi.id, gi.calculation
                  FROM {grade_items} gi
                 WHERE gi.id {$sql} AND
                       calculation IS NOT NULL";
        $rs = $DB->get_recordset_sql($sql, $params);
        foreach ($rs as $gradeitem) {
            // Collect all of the used grade item id references
            if (preg_match_all('/##gi(\d+)##/', $gradeitem->calculation, $matches) < 1) {
                // This calculation doesn't reference any other grade items... EASY!
                continue;
            }
            // For this next bit we are going to do the replacement of id's in two steps:
            // 1. We will replace all old id references with a special mapping reference.
            // 2. We will replace all mapping references with id's
            // Why do we do this?
            // Because there potentially there will be an overlap of ids within the query and we
            // we substitute the wrong id.. safest way around this is the two step system
            $calculationmap = array();
            $mapcount = 0;
            foreach ($matches[1] as $match) {
                // Check that the old id is known to us, if not it was broken to begin with and will
                // continue to be broken.
                if (!array_key_exists($match, $mappings)) {
                    continue;
                }
                // Our special mapping key
                $mapping = '##MAPPING'.$mapcount.'##';
                // The old id that exists within the calculation now
                $oldid = '##gi'.$match.'##';
                // The new id that we want to replace the old one with.
                $newid = '##gi'.$mappings[$match].'##';
                // Replace in the special mapping key
                $gradeitem->calculation = str_replace($oldid, $mapping, $gradeitem->calculation);
                // And record the mapping
                $calculationmap[$mapping] = $newid;
                $mapcount++;
            }
            // Iterate all special mappings for this calculation and replace in the new id's
            foreach ($calculationmap as $mapping => $newid) {
                $gradeitem->calculation = str_replace($mapping, $newid, $gradeitem->calculation);
            }
            // Update the calculation now that its being remapped
            $DB->update_record('grade_items', $gradeitem);
        }
        $rs->close();

        // Need to correct the grade category path and parent
        $conditions = array(
            'courseid' => $this->get_courseid()
        );

        $rs = $DB->get_recordset('grade_categories', $conditions);
        // Get all the parents correct first as grade_category::build_path() loads category parents from the DB
        foreach ($rs as $gc) {
            if (!empty($gc->parent)) {
                $grade_category = new stdClass();
                $grade_category->id = $gc->id;
                $grade_category->parent = $this->get_mappingid('grade_category', $gc->parent);
                $DB->update_record('grade_categories', $grade_category);
            }
        }
        $rs->close();

        // Now we can rebuild all the paths
        $rs = $DB->get_recordset('grade_categories', $conditions);
        foreach ($rs as $gc) {
            $grade_category = new stdClass();
            $grade_category->id = $gc->id;
            $grade_category->path = grade_category::build_path($gc);
            $grade_category->depth = substr_count($grade_category->path, '/') - 1;
            $DB->update_record('grade_categories', $grade_category);
        }
        $rs->close();

        // Check what to do with the minmaxtouse setting.
        $this->check_minmaxtouse();

        // Freeze gradebook calculations if needed.
        $this->gradebook_calculation_freeze();

        // Restore marks items as needing update. Update everything now.
        grade_regrade_final_grades($this->get_courseid());
    }

    /**
     * Freeze gradebook calculation if needed.
     *
     * This is similar to various upgrade scripts that check if the freeze is needed.
     */
    protected function gradebook_calculation_freeze() {
        global $CFG;
        $gradebookcalculationsfreeze = get_config('core', 'gradebook_calculations_freeze_' . $this->get_courseid());
        preg_match('/(\d{8})/', $this->get_task()->get_info()->moodle_release, $matches);
        $backupbuild = (int)$matches[1];

        // Extra credits need adjustments only for backups made between 2.8 release (20141110) and the fix release (20150619).
        if (!$gradebookcalculationsfreeze && $backupbuild >= 20141110 && $backupbuild < 20150619) {
            require_once($CFG->libdir . '/db/upgradelib.php');
            upgrade_extra_credit_weightoverride($this->get_courseid());
        }
        // Calculated grade items need recalculating for backups made between 2.8 release (20141110) and the fix release (20150627).
        if (!$gradebookcalculationsfreeze && $backupbuild >= 20141110 && $backupbuild < 20150627) {
            require_once($CFG->libdir . '/db/upgradelib.php');
            upgrade_calculated_grade_items($this->get_courseid());
        }
    }

    /**
     * Checks what should happen with the course grade setting minmaxtouse.
     *
     * This is related to the upgrade step at the time the setting was added.
     *
     * @see MDL-48618
     * @return void
     */
    protected function check_minmaxtouse() {
        global $CFG, $DB;
        require_once($CFG->libdir . '/gradelib.php');

        $userinfo = $this->task->get_setting_value('users');
        $settingname = 'minmaxtouse';
        $courseid = $this->get_courseid();
        $minmaxtouse = $DB->get_field('grade_settings', 'value', array('courseid' => $courseid, 'name' => $settingname));
        $version28start = 2014111000.00;
        $version28last = 2014111006.05;
        $version29start = 2015051100.00;
        $version29last = 2015060400.02;

        $target = $this->get_task()->get_target();
        if ($minmaxtouse === false &&
                ($target != backup::TARGET_CURRENT_ADDING && $target != backup::TARGET_EXISTING_ADDING)) {
            // The setting was not found because this setting did not exist at the time the backup was made.
            // And we are not restoring as merge, in which case we leave the course as it was.
            $version = $this->get_task()->get_info()->moodle_version;

            if ($version < $version28start) {
                // We need to set it to use grade_item, but only if the site-wide setting is different. No need to notice them.
                if ($CFG->grade_minmaxtouse != GRADE_MIN_MAX_FROM_GRADE_ITEM) {
                    grade_set_setting($courseid, $settingname, GRADE_MIN_MAX_FROM_GRADE_ITEM);
                }

            } else if (($version >= $version28start && $version < $version28last) ||
                    ($version >= $version29start && $version < $version29last)) {
                // They should be using grade_grade when the course has inconsistencies.

                $sql = "SELECT gi.id
                          FROM {grade_items} gi
                          JOIN {grade_grades} gg
                            ON gg.itemid = gi.id
                         WHERE gi.courseid = ?
                           AND (gi.itemtype != ? AND gi.itemtype != ?)
                           AND (gg.rawgrademax != gi.grademax OR gg.rawgrademin != gi.grademin)";

                // The course can only have inconsistencies when we restore the user info,
                // we do not need to act on existing grades that were not restored as part of this backup.
                if ($userinfo && $DB->record_exists_sql($sql, array($courseid, 'course', 'category'))) {

                    // Display the notice as we do during upgrade.
                    set_config('show_min_max_grades_changed_' . $courseid, 1);

                    if ($CFG->grade_minmaxtouse != GRADE_MIN_MAX_FROM_GRADE_GRADE) {
                        // We need set the setting as their site-wise setting is not GRADE_MIN_MAX_FROM_GRADE_GRADE.
                        // If they are using the site-wide grade_grade setting, we only want to notice them.
                        grade_set_setting($courseid, $settingname, GRADE_MIN_MAX_FROM_GRADE_GRADE);
                    }
                }

            } else {
                // This should never happen because from now on minmaxtouse is always saved in backups.
            }
        }
    }
}

/**
 * Step in charge of restoring the grade history of a course.
 *
 * The execution conditions are itendical to {@link restore_gradebook_structure_step} because
 * we do not want to restore the history if the gradebook and its content has not been
 * restored. At least for now.
 */
class restore_grade_history_structure_step extends restore_structure_step {

     protected function execute_condition() {
        global $CFG, $DB;

        if ($this->get_courseid() == SITEID) {
            return false;
        }

        // No gradebook info found, don't execute.
        $fullpath = $this->task->get_taskbasepath();
        $fullpath = rtrim($fullpath, '/') . '/' . $this->filename;
        if (!file_exists($fullpath)) {
            return false;
        }

        // Some module present in backup file isn't available to restore in this site, don't execute.
        if ($this->task->is_missing_modules()) {
            return false;
        }

        // Some activity has been excluded to be restored, don't execute.
        if ($this->task->is_excluding_activities()) {
            return false;
        }

        // There should only be one grade category (the 1 associated with the course itself).
        $category = new stdclass();
        $category->courseid  = $this->get_courseid();
        $catcount = $DB->count_records('grade_categories', (array)$category);
        if ($catcount > 1) {
            return false;
        }

        // Arrived here, execute the step.
        return true;
     }

    protected function define_structure() {
        $paths = array();

        // Settings to use.
        $userinfo = $this->get_setting_value('users');
        $history = $this->get_setting_value('grade_histories');

        if ($userinfo && $history) {
            $paths[] = new restore_path_element('grade_grade',
               '/grade_history/grade_grades/grade_grade');
        }

        return $paths;
    }

    protected function process_grade_grade($data) {
        global $DB;

        $data = (object)($data);
        $olduserid = $data->userid;
        unset($data->id);

        $data->userid = $this->get_mappingid('user', $data->userid, null);
        if (!empty($data->userid)) {
            // Do not apply the date offsets as this is history.
            $data->itemid = $this->get_mappingid('grade_item', $data->itemid);
            $data->oldid = $this->get_mappingid('grade_grades', $data->oldid);
            $data->usermodified = $this->get_mappingid('user', $data->usermodified, null);
            $data->rawscaleid = $this->get_mappingid('scale', $data->rawscaleid);
            $DB->insert_record('grade_grades_history', $data);
        } else {
            $message = "Mapped user id not found for user id '{$olduserid}', grade item id '{$data->itemid}'";
            $this->log($message, backup::LOG_DEBUG);
        }
    }

}

/**
 * decode all the interlinks present in restored content
 * relying 100% in the restore_decode_processor that handles
 * both the contents to modify and the rules to be applied
 */
class restore_decode_interlinks extends restore_execution_step {

    protected function define_execution() {
        // Get the decoder (from the plan)
        $decoder = $this->task->get_decoder();
        restore_decode_processor::register_link_decoders($decoder); // Add decoder contents and rules
        // And launch it, everything will be processed
        $decoder->execute();
    }
}

/**
 * first, ensure that we have no gaps in section numbers
 * and then, rebuid the course cache
 */
class restore_rebuild_course_cache extends restore_execution_step {

    protected function define_execution() {
        global $DB;

        // Although there is some sort of auto-recovery of missing sections
        // present in course/formats... here we check that all the sections
        // from 0 to MAX(section->section) exist, creating them if necessary
        $maxsection = $DB->get_field('course_sections', 'MAX(section)', array('course' => $this->get_courseid()));
        // Iterate over all sections
        for ($i = 0; $i <= $maxsection; $i++) {
            // If the section $i doesn't exist, create it
            if (!$DB->record_exists('course_sections', array('course' => $this->get_courseid(), 'section' => $i))) {
                $sectionrec = array(
                    'course' => $this->get_courseid(),
                    'section' => $i);
                $DB->insert_record('course_sections', $sectionrec); // missing section created
            }
        }

        // Rebuild cache now that all sections are in place
        rebuild_course_cache($this->get_courseid());
        cache_helper::purge_by_event('changesincourse');
        cache_helper::purge_by_event('changesincoursecat');
    }
}

/**
 * Review all the tasks having one after_restore method
 * executing it to perform some final adjustments of information
 * not available when the task was executed.
 */
class restore_execute_after_restore extends restore_execution_step {

    protected function define_execution() {

        // Simply call to the execute_after_restore() method of the task
        // that always is the restore_final_task
        $this->task->launch_execute_after_restore();
    }
}


/**
 * Review all the (pending) block positions in backup_ids, matching by
 * contextid, creating positions as needed. This is executed by the
 * final task, once all the contexts have been created
 */
class restore_review_pending_block_positions extends restore_execution_step {

    protected function define_execution() {
        global $DB;

        // Get all the block_position objects pending to match
        $params = array('backupid' => $this->get_restoreid(), 'itemname' => 'block_position');
        $rs = $DB->get_recordset('backup_ids_temp', $params, '', 'itemid, info');
        // Process block positions, creating them or accumulating for final step
        foreach($rs as $posrec) {
            // Get the complete position object out of the info field.
            $position = backup_controller_dbops::decode_backup_temp_info($posrec->info);
            // If position is for one already mapped (known) contextid
            // process it now, creating the position, else nothing to
            // do, position finally discarded
            if ($newctx = restore_dbops::get_backup_ids_record($this->get_restoreid(), 'context', $position->contextid)) {
                $position->contextid = $newctx->newitemid;
                // Create the block position
                $DB->insert_record('block_positions', $position);
            }
        }
        $rs->close();
    }
}


/**
 * Updates the availability data for course modules and sections.
 *
 * Runs after the restore of all course modules, sections, and grade items has
 * completed. This is necessary in order to update IDs that have changed during
 * restore.
 *
 * @package core_backup
 * @copyright 2014 The Open University
 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class restore_update_availability extends restore_execution_step {

    protected function define_execution() {
        global $CFG, $DB;

        // Note: This code runs even if availability is disabled when restoring.
        // That will ensure that if you later turn availability on for the site,
        // there will be no incorrect IDs. (It doesn't take long if the restored
        // data does not contain any availability information.)

        // Get modinfo with all data after resetting cache.
        rebuild_course_cache($this->get_courseid(), true);
        $modinfo = get_fast_modinfo($this->get_courseid());

        // Get the date offset for this restore.
        $dateoffset = $this->apply_date_offset(1) - 1;

        // Update all sections that were restored.
        $params = array('backupid' => $this->get_restoreid(), 'itemname' => 'course_section');
        $rs = $DB->get_recordset('backup_ids_temp', $params, '', 'newitemid');
        $sectionsbyid = null;
        foreach ($rs as $rec) {
            if (is_null($sectionsbyid)) {
                $sectionsbyid = array();
                foreach ($modinfo->get_section_info_all() as $section) {
                    $sectionsbyid[$section->id] = $section;
                }
            }
            if (!array_key_exists($rec->newitemid, $sectionsbyid)) {
                // If the section was not fully restored for some reason
                // (e.g. due to an earlier error), skip it.
                $this->get_logger()->process('Section not fully restored: id ' .
                        $rec->newitemid, backup::LOG_WARNING);
                continue;
            }
            $section = $sectionsbyid[$rec->newitemid];
            if (!is_null($section->availability)) {
                $info = new \core_availability\info_section($section);
                $info->update_after_restore($this->get_restoreid(),
                        $this->get_courseid(), $this->get_logger(), $dateoffset, $this->task);
            }
        }
        $rs->close();

        // Update all modules that were restored.
        $params = array('backupid' => $this->get_restoreid(), 'itemname' => 'course_module');
        $rs = $DB->get_recordset('backup_ids_temp', $params, '', 'newitemid');
        foreach ($rs as $rec) {
            if (!array_key_exists($rec->newitemid, $modinfo->cms)) {
                // If the module was not fully restored for some reason
                // (e.g. due to an earlier error), skip it.
                $this->get_logger()->process('Module not fully restored: id ' .
                        $rec->newitemid, backup::LOG_WARNING);
                continue;
            }
            $cm = $modinfo->get_cm($rec->newitemid);
            if (!is_null($cm->availability)) {
                $info = new \core_availability\info_module($cm);
                $info->update_after_restore($this->get_restoreid(),
                        $this->get_courseid(), $this->get_logger(), $dateoffset, $this->task);
            }
        }
        $rs->close();
    }
}


/**
 * Process legacy module availability records in backup_ids.
 *
 * Matches course modules and grade item id once all them have been already restored.
 * Only if all matchings are satisfied the availability condition will be created.
 * At the same time, it is required for the site to have that functionality enabled.
 *
 * This step is included only to handle legacy backups (2.6 and before). It does not
 * do anything for newer backups.
 *
 * @copyright 2014 The Open University
 * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
 */
class restore_process_course_modules_availability extends restore_execution_step {

    protected function define_execution() {
        global $CFG, $DB;

        // Site hasn't availability enabled
        if (empty($CFG->enableavailability)) {
            return;
        }

        // Do both modules and sections.
        foreach (array('module', 'section') as $table) {
            // Get all the availability objects to process.
            $params = array('backupid' => $this->get_restoreid(), 'itemname' => $table . '_availability');
            $rs = $DB->get_recordset('backup_ids_temp', $params, '', 'itemid, info');
            // Process availabilities, creating them if everything matches ok.
            foreach ($rs as $availrec) {
                $allmatchesok = true;
                // Get the complete legacy availability object.
                $availability = backup_controller_dbops::decode_backup_temp_info($availrec->info);

                // Note: This code used to update IDs, but that is now handled by the
                // current code (after restore) instead of this legacy code.

                // Get showavailability option.
                $thingid = ($table === 'module') ? $availability->coursemoduleid :
                        $availability->coursesectionid;
                $showrec = restore_dbops::get_backup_ids_record($this->get_restoreid(),
                        $table . '_showavailability', $thingid);
                if (!$showrec) {
                    // Should not happen.
                    throw new coding_exception('No matching showavailability record');
                }
                $show = $showrec->info->showavailability;

                // The $availability object is now in the format used in the old
                // system. Interpret this and convert to new system.
                $currentvalue = $DB->get_field('course_' . $table . 's', 'availability',
                        array('id' => $thingid), MUST_EXIST);
                $newvalue = \core_availability\info::add_legacy_availability_condition(
                        $currentvalue, $availability, $show);
                $DB->set_field('course_' . $table . 's', 'availability', $newvalue,
                        array('id' => $thingid));
            }
        }
        $rs->close();
    }
}


/*
 * Execution step that, *conditionally* (if there isn't preloaded information)
 * will load the inforef files for all the included course/section/activity tasks
 * to backup_temp_ids. They will be stored with "xxxxref" as itemname
 */
class restore_load_included_inforef_records extends restore_execution_step {

    protected function define_execution() {

        if ($this->task->get_preloaded_information()) { // if info is already preloaded, nothing to do
            return;
        }

        // Get all the included tasks
        $tasks = restore_dbops::get_included_tasks($this->get_restoreid());
        $progress = $this->task->get_progress();
        $progress->start_progress($this->get_name(), count($tasks));
        foreach ($tasks as $task) {
            // Load the inforef.xml file if exists
            $inforefpath = $task->get_taskbasepath() . '/inforef.xml';
            if (file_exists($inforefpath)) {
                // Load each inforef file to temp_ids.
                restore_dbops::load_inforef_to_tempids($this->get_restoreid(), $inforefpath, $progress);
            }
        }
        $progress->end_progress();
    }
}

/*
 * Execution step that will load all the needed files into backup_files_temp
 *   - info: contains the whole original object (times, names...)
 * (all them being original ids as loaded from xml)
 */
class restore_load_included_files extends restore_structure_step {

    protected function define_structure() {

        $file = new restore_path_element('file', '/files/file');

        return array($file);
    }

    /**
     * Process one <file> element from files.xml
     *
     * @param array $data the element data
     */
    public function process_file($data) {

        $data = (object)$data; // handy

        // load it if needed:
        //   - it it is one of the annotated inforef files (course/section/activity/block)
        //   - it is one "user", "group", "grouping", "grade", "question" or "qtype_xxxx" component file (that aren't sent to inforef ever)
        // TODO: qtype_xxx should be replaced by proper backup_qtype_plugin::get_components_and_fileareas() use,
        //       but then we'll need to change it to load plugins itself (because this is executed too early in restore)
        $isfileref   = restore_dbops::get_backup_ids_record($this->get_restoreid(), 'fileref', $data->id);
        $iscomponent = ($data->component == 'user' || $data->component == 'group' || $data->component == 'badges' ||
                        $data->component == 'grouping' || $data->component == 'grade' ||
                        $data->component == 'question' || substr($data->component, 0, 5) == 'qtype');
        if ($isfileref || $iscomponent) {
            restore_dbops::set_backup_files_record($this->get_restoreid(), $data);
        }
    }
}

/**
 * Execution step that, *conditionally* (if there isn't preloaded information),
 * will load all the needed roles to backup_temp_ids. They will be stored with
 * "role" itemname. Also it will perform one automatic mapping to roles existing
 * in the target site, based in permissions of the user performing the restore,
 * archetypes and other bits. At the end, each original role will have its associated
 * target role or 0 if it's going to be skipped. Note we wrap everything over one
 * restore_dbops method, as far as the same stuff is going to be also executed
 * by restore prechecks
 */
class restore_load_and_map_roles extends restore_execution_step {

    protected function define_execution() {
        if ($this->task->get_preloaded_information()) { // if info is already preloaded
            return;
        }

        $file = $this->get_basepath() . '/roles.xml';
        // Load needed toles to temp_ids
        restore_dbops::load_roles_to_tempids($this->get_restoreid(), $file);

        // Process roles, mapping/skipping. Any error throws exception
        // Note we pass controller's info because it can contain role mapping information
        // about manual mappings performed by UI
        restore_dbops::process_included_roles($this->get_restoreid(), $this->task->get_courseid(), $this->task->get_userid(), $this->task->is_samesite(), $this->task->get_info()->role_mappings);
    }
}

/**
 * Execution step that, *conditionally* (if there isn't preloaded information
 * and users have been selected in settings, will load all the needed users
 * to backup_temp_ids. They will be stored with "user" itemname and with
 * their original contextid as paremitemid
 */
class restore_load_included_users extends restore_execution_step {

    protected function define_execution() {

        if ($this->task->get_preloaded_information()) { // if info is already preloaded, nothing to do
            return;
        }
        if (!$this->task->get_setting_value('users')) { // No userinfo being restored, nothing to do
            return;
        }
        $file = $this->get_basepath() . '/users.xml';
        // Load needed users to temp_ids.
        restore_dbops::load_users_to_tempids($this->get_restoreid(), $file, $this->task->get_progress());
    }
}

/**
 * Execution step that, *conditionally* (if there isn't preloaded information
 * and users have been selected in settings, will process all the needed users
 * in order to decide and perform any action with them (create / map / error)
 * Note: Any error will cause exception, as far as this is the same processing
 * than the one into restore prechecks (that should have stopped process earlier)
 */
class restore_process_included_users extends restore_execution_step {

    protected function define_execution() {

        if ($this->task->get_preloaded_information()) { // if info is already preloaded, nothing to do
            return;
        }
        if (!$this->task->get_setting_value('users')) { // No userinfo being restored, nothing to do
            return;
        }
        restore_dbops::process_included_users($this->get_restoreid(), $this->task->get_courseid(),
                $this->task->get_userid(), $this->task->is_samesite(), $this->task->get_progress());
    }
}

/**
 * Execution step that will create all the needed users as calculated
 * by @restore_process_included_users (those having newiteind = 0)
 */
class restore_create_included_users extends restore_execution_step {

    protected function define_execution() {

        restore_dbops::create_included_users($this->get_basepath(), $this->get_restoreid(),
                $this->task->get_userid(), $this->task->get_progress());
    }
}

/**
 * Structure step that will create all the needed groups and groupings
 * by loading them from the groups.xml file performing the required matches.
 * Note group members only will be added if restoring user info
 */
class restore_groups_structure_step extends restore_structure_step {

    protected function define_structure() {

        $paths = array(); // Add paths here

        // Do not include group/groupings information if not requested.
        $groupinfo = $this->get_setting_value('groups');
        if ($groupinfo) {
            $paths[] = new restore_path_element('group', '/groups/group');
            $paths[] = new restore_path_element('grouping', '/groups/groupings/grouping');
            $paths[] = new restore_path_element('grouping_group', '/groups/groupings/grouping/grouping_groups/grouping_group');
        }
        return $paths;
    }

    // Processing functions go here
    public function process_group($data) {
        global $DB;

        $data = (object)$data; // handy
        $data->courseid = $this->get_courseid();

        // Only allow the idnumber to be set if the user has permission and the idnumber is not already in use by
        // another a group in the same course
        $context = context_course::instance($data->courseid);
        if (isset($data->idnumber) and has_capability('moodle/course:changeidnumber', $context, $this->task->get_userid())) {
            if (groups_get_group_by_idnumber($data->courseid, $data->idnumber)) {
                unset($data->idnumber);
            }
        } else {
            unset($data->idnumber);
        }

        $oldid = $data->id;    // need this saved for later

        $restorefiles = false; // Only if we end creating the group

        // Search if the group already exists (by name & description) in the target course
        $description_clause = '';
        $params = array('courseid' => $this->get_courseid(), 'grname' => $data->name);
        if (!empty($data->description)) {
            $description_clause = ' AND ' .
                                  $DB->sql_compare_text('description') . ' = ' . $DB->sql_compare_text(':description');
           $params['description'] = $data->description;
        }
        if (!$groupdb = $DB->get_record_sql("SELECT *
                                               FROM {groups}
                                              WHERE courseid = :courseid
                                                AND name = :grname $description_clause", $params)) {
            // group doesn't exist, create
            $newitemid = $DB->insert_record('groups', $data);
            $restorefiles = true; // We'll restore the files
        } else {
            // group exists, use it
            $newitemid = $groupdb->id;
        }
        // Save the id mapping
        $this->set_mapping('group', $oldid, $newitemid, $restorefiles);
        // Invalidate the course group data cache just in case.
        cache_helper::invalidate_by_definition('core', 'groupdata', array(), array($data->courseid));
    }

    public function process_grouping($data) {
        global $DB;

        $data = (object)$data; // handy
        $data->courseid = $this->get_courseid();

        // Only allow the idnumber to be set if the user has permission and the idnumber is not already in use by
        // another a grouping in the same course
        $context = context_course::instance($data->courseid);
        if (isset($data->idnumber) and has_capability('moodle/course:changeidnumber', $context, $this->task->get_userid())) {
            if (groups_get_grouping_by_idnumber($data->courseid, $data->idnumber)) {
                unset($data->idnumber);
            }
        } else {
            unset($data->idnumber);
        }

        $oldid = $data->id;    // need this saved for later
        $restorefiles = false; // Only if we end creating the grouping

        // Search if the grouping already exists (by name & description) in the target course
        $description_clause = '';
        $params = array('courseid' => $this->get_courseid(), 'grname' => $data->name);
        if (!empty($data->description)) {
            $description_clause = ' AND ' .
                                  $DB->sql_compare_text('description') . ' = ' . $DB->sql_compare_text(':description');
           $params['description'] = $data->description;
        }
        if (!$groupingdb = $DB->get_record_sql("SELECT *
                                                  FROM {groupings}
                                                 WHERE courseid = :courseid
                                                   AND name = :grname $description_clause", $params)) {
            // grouping doesn't exist, create
            $newitemid = $DB->insert_record('groupings', $data);
            $restorefiles = true; // We'll restore the files
        } else {
            // grouping exists, use it
            $newitemid = $groupingdb->id;
        }
        // Save the id mapping
        $this->set_mapping('grouping', $oldid, $newitemid, $restorefiles);
        // Invalidate the course group data cache just in case.
        cache_helper::invalidate_by_definition('core', 'groupdata', array(), array($data->courseid));
    }

    public function process_grouping_group($data) {
        global $CFG;

        require_once($CFG->dirroot.'/group/lib.php');

        $data = (object)$data;
        groups_assign_grouping($this->get_new_parentid('grouping'), $this->get_mappingid('group', $data->groupid), $data->timeadded);
    }

    protected function after_execute() {
        // Add group related files, matching with "group" mappings
        $this->add_related_files('group', 'icon', 'group');
        $this->add_related_files('group', 'description', 'group');
        // Add grouping related files, matching with "grouping" mappings
        $this->add_related_files('grouping', 'description', 'grouping');
        // Invalidate the course group data.
        cache_helper::invalidate_by_definition('core', 'groupdata', array(), array($this->get_courseid()));
    }

}

/**
 * Structure step that will create all the needed group memberships
 * by loading them from the groups.xml file performing the required matches.
 */
class restore_groups_members_structure_step extends restore_structure_step {

    protected $plugins = null;

    protected function define_structure() {

        $paths = array(); // Add paths here

        if ($this->get_setting_value('groups') && $this->get_setting_value('users')) {
            $paths[] = new restore_path_element('group', '/groups/group');
            $paths[] = new restore_path_element('member', '/groups/group/group_members/group_member');
        }

        return $paths;
    }

    public function process_group($data) {
        $data = (object)$data; // handy

        // HACK ALERT!
        // Not much to do here, this groups mapping should be already done from restore_groups_structure_step.
        // Let's fake internal state to make $this->get_new_parentid('group') work.

        $this->set_mapping('group', $data->id, $this->get_mappingid('group', $data->id));
    }

    public function process_member($data) {
        global $DB, $CFG;
        require_once("$CFG->dirroot/group/lib.php");

        // NOTE: Always use groups_add_member() because it triggers events and verifies if user is enrolled.

        $data = (object)$data; // handy

        // get parent group->id
        $data->groupid = $this->get_new_parentid('group');

        // map user newitemid and insert if not member already
        if ($data->userid = $this->get_mappingid('user', $data->userid)) {
            if (!$DB->record_exists('groups_members', array('groupid' => $data->groupid, 'userid' => $data->userid))) {
                // Check the component, if any, exists.
                if (empty($data->component)) {
                    groups_add_member($data->groupid, $data->userid);

                } else if ((strpos($data->component, 'enrol_') === 0)) {
                    // Deal with enrolment groups - ignore the component and just find out the instance via new id,
                    // it is possible that enrolment was restored using different plugin type.
                    if (!isset($this->plugins)) {
                        $this->plugins = enrol_get_plugins(true);
                    }
                    if ($enrolid = $this->get_mappingid('enrol', $data->itemid)) {
                        if ($instance = $DB->get_record('enrol', array('id'=>$enrolid))) {
                            if (isset($this->plugins[$instance->enrol])) {
                                $this->plugins[$instance->enrol]->restore_group_member($instance, $data->groupid, $data->userid);
                            }
                        }
                    }

                } else {
                    $dir = core_component::get_component_directory($data->component);
                    if ($dir and is_dir($dir)) {
                        if (component_callback($data->component, 'restore_group_member', array($this, $data), true)) {
                            return;
                        }
                    }
                    // Bad luck, plugin could not restore the data, let's add normal membership.
                    groups_add_member($data->groupid, $data->userid);
                    $message = "Restore of '$data->component/$data->itemid' group membership is not supported, using standard group membership instead.";
                    $this->log($message, backup::LOG_WARNING);
                }
            }
        }
    }
}

/**
 * Structure step that will create all the needed scales
 * by loading them from the scales.xml
 */
class restore_scales_structure_step extends restore_structure_step {

    protected function define_structure() {

        $paths = array(); // Add paths here
        $paths[] = new restore_path_element('scale', '/scales_definition/scale');
        return $paths;
    }

    protected function process_scale($data) {
        global $DB;

        $data = (object)$data;

        $restorefiles = false; // Only if we end creating the group

        $oldid = $data->id;    // need this saved for later

        // Look for scale (by 'scale' both in standard (course=0) and current course
        // with priority to standard scales (ORDER clause)
        // scale is not course unique, use get_record_sql to suppress warning
        // Going to compare LOB columns so, use the cross-db sql_compare_text() in both sides
        $compare_scale_clause = $DB->sql_compare_text('scale')  . ' = ' . $DB->sql_compare_text(':scaledesc');
        $params = array('courseid' => $this->get_courseid(), 'scaledesc' => $data->scale);
        if (!$scadb = $DB->get_record_sql("SELECT *
                                            FROM {scale}
                                           WHERE courseid IN (0, :courseid)
                                             AND $compare_scale_clause
                                        ORDER BY courseid", $params, IGNORE_MULTIPLE)) {
            // Remap the user if possible, defaut to user performing the restore if not
            $userid = $this->get_mappingid('user', $data->userid);
            $data->userid = $userid ? $userid : $this->task->get_userid();
            // Remap the course if course scale
            $data->courseid = $data->courseid ? $this->get_courseid() : 0;
            // If global scale (course=0), check the user has perms to create it
            // falling to course scale if not
            $systemctx = context_system::instance();
            if ($data->courseid == 0 && !has_capability('moodle/course:managescales', $systemctx , $this->task->get_userid())) {
                $data->courseid = $this->get_courseid();
            }
            // scale doesn't exist, create
            $newitemid = $DB->insert_record('scale', $data);
            $restorefiles = true; // We'll restore the files
        } else {
            // scale exists, use it
            $newitemid = $scadb->id;
        }
        // Save the id mapping (with files support at system context)
        $this->set_mapping('scale', $oldid, $newitemid, $restorefiles, $this->task->get_old_system_contextid());
    }

    protected function after_execute() {
        // Add scales related files, matching with "scale" mappings
        $this->add_related_files('grade', 'scale', 'scale', $this->task->get_old_system_contextid());
    }
}


/**
 * Structure step that will create all the needed outocomes
 * by loading them from the outcomes.xml
 */
class restore_outcomes_structure_step extends restore_structure_step {

    protected function define_structure() {

        $paths = array(); // Add paths here
        $paths[] = new restore_path_element('outcome', '/outcomes_definition/outcome');
        return $paths;
    }

    protected function process_outcome($data) {
        global $DB;

        $data = (object)$data;

        $restorefiles = false; // Only if we end creating the group

        $oldid = $data->id;    // need this saved for later

        // Look for outcome (by shortname both in standard (courseid=null) and current course
        // with priority to standard outcomes (ORDER clause)
        // outcome is not course unique, use get_record_sql to suppress warning
        $params = array('courseid' => $this->get_courseid(), 'shortname' => $data->shortname);
        if (!$outdb = $DB->get_record_sql('SELECT *
                                             FROM {grade_outcomes}
                                            WHERE shortname = :shortname
                                              AND (courseid = :courseid OR courseid IS NULL)
                                         ORDER BY COALESCE(courseid, 0)', $params, IGNORE_MULTIPLE)) {
            // Remap the user
            $userid = $this->get_mappingid('user', $data->usermodified);
            $data->usermodified = $userid ? $userid : $this->task->get_userid();
            // Remap the scale
            $data->scaleid = $this->get_mappingid('scale', $data->scaleid);
            // Remap the course if course outcome
            $data->courseid = $data->courseid ? $this->get_courseid() : null;
            // If global outcome (course=null), check the user has perms to create it
            // falling to course outcome if not
            $systemctx = context_system::instance();
            if (is_null($data->courseid) && !has_capability('moodle/grade:manageoutcomes', $systemctx , $this->task->get_userid())) {
                $data->courseid = $this->get_courseid();
            }
            // outcome doesn't exist, create
            $newitemid = $DB->insert_record('grade_outcomes', $data);
            $restorefiles = true; // We'll restore the files
        } else {
            // scale exists, use it
            $newitemid = $outdb->id;
        }
        // Set the corresponding grade_outcomes_courses record
        $outcourserec = new stdclass();
        $outcourserec->courseid  = $this->get_courseid();
        $outcourserec->outcomeid = $newitemid;
        if (!$DB->record_exists('grade_outcomes_courses', (array)$outcourserec)) {
            $DB->insert_record('grade_outcomes_courses', $outcourserec);
        }
        // Save the id mapping (with files support at system context)
        $this->set_mapping('outcome', $oldid, $newitemid, $restorefiles, $this->task->get_old_system_contextid());
    }

    protected function after_execute() {
        // Add outcomes related files, matching with "outcome" mappings
        $this->add_related_files('grade', 'outcome', 'outcome', $this->task->get_old_system_contextid());
    }
}

/**
 * Execution step that, *conditionally* (if there isn't preloaded information
 * will load all the question categories and questions (header info only)
 * to backup_temp_ids. They will be stored with "question_category" and
 * "question" itemnames and with their original contextid and question category
 * id as paremitemids
 */
class restore_load_categories_and_questions extends restore_execution_step {

    protected function define_execution() {

        if ($this->task->get_preloaded_information()) { // if info is already preloaded, nothing to do
            return;
        }
        $file = $this->get_basepath() . '/questions.xml';
        restore_dbops::load_categories_and_questions_to_tempids($this->get_restoreid(), $file);
    }
}

/**
 * Execution step that, *conditionally* (if there isn't preloaded information)
 * will process all the needed categories and questions
 * in order to decide and perform any action with them (create / map / error)
 * Note: Any error will cause exception, as far as this is the same processing
 * than the one into restore prechecks (that should have stopped process earlier)
 */
class restore_process_categories_and_questions extends restore_execution_step {

    protected function define_execution() {

        if ($this->task->get_preloaded_information()) { // if info is already preloaded, nothing to do
            return;
        }
        restore_dbops::process_categories_and_questions($this->get_restoreid(), $this->task->get_courseid(), $this->task->get_userid(), $this->task->is_samesite());
    }
}

/**
 * Structure step that will read the section.xml creating/updating sections
 * as needed, rebuilding course cache and other friends
 */
class restore_section_structure_step extends restore_structure_step {
    /** @var array Cache: Array of id => course format */
    private static $courseformats = array();

    /**
     * Resets a static cache of course formats. Required for unit testing.
     */
    public static function reset_caches() {
        self::$courseformats = array();
    }

    protected function define_structure() {
        global $CFG;

        $paths = array();

        $section = new restore_path_element('section', '/section');
        $paths[] = $section;
        if ($CFG->enableavailability) {
            $paths[] = new restore_path_element('availability', '/section/availability');
            $paths[] = new restore_path_element('availability_field', '/section/availability_field');
        }
        $paths[] = new restore_path_element('course_format_options', '/section/course_format_options');

        // Apply for 'format' plugins optional paths at section level
        $this->add_plugin_structure('format', $section);

        // Apply for 'local' plugins optional paths at section level
        $this->add_plugin_structure('local', $section);

        return $paths;
    }

    public function process_section($data) {
        global $CFG, $DB;
        $data = (object)$data;
        $oldid = $data->id; // We'll need this later

        $restorefiles = false;

        // Look for the section
        $section = new stdclass();
        $section->course  = $this->get_courseid();
        $section->section = $data->number;
        // Section doesn't exist, create it with all the info from backup
        if (!$secrec = $DB->get_record('course_sections', (array)$section)) {
            $section->name = $data->name;
            $section->summary = $data->summary;
            $section->summaryformat = $data->summaryformat;
            $section->sequence = '';
            $section->visible = $data->visible;
            if (empty($CFG->enableavailability)) { // Process availability information only if enabled.
                $section->availability = null;
            } else {
                $section->availability = isset($data->availabilityjson) ? $data->availabilityjson : null;
                // Include legacy [<2.7] availability data if provided.
                if (is_null($section->availability)) {
                    $section->availability = \core_availability\info::convert_legacy_fields(
                            $data, true);
                }
            }
            $newitemid = $DB->insert_record('course_sections', $section);
            $restorefiles = true;

        // Section exists, update non-empty information
        } else {
            $section->id = $secrec->id;
            if ((string)$secrec->name === '') {
                $section->name = $data->name;
            }
            if (empty($secrec->summary)) {
                $section->summary = $data->summary;
                $section->summaryformat = $data->summaryformat;
                $restorefiles = true;
            }

            // Don't update availability (I didn't see a useful way to define
            // whether existing or new one should take precedence).

            $DB->update_record('course_sections', $section);
            $newitemid = $secrec->id;
        }

        // Annotate the section mapping, with restorefiles option if needed
        $this->set_mapping('course_section', $oldid, $newitemid, $restorefiles);

        // set the new course_section id in the task
        $this->task->set_sectionid($newitemid);

        // If there is the legacy showavailability data, store this for later use.
        // (This data is not present when restoring 'new' backups.)
        if (isset($data->showavailability)) {
            // Cache the showavailability flag using the backup_ids data field.
            restore_dbops::set_backup_ids_record($this->get_restoreid(),
                    'section_showavailability', $newitemid, 0, null,
                    (object)array('showavailability' => $data->showavailability));
        }

        // Commented out. We never modify course->numsections as far as that is used
        // by a lot of people to "hide" sections on purpose (so this remains as used to be in Moodle 1.x)
        // Note: We keep the code here, to know about and because of the possibility of making this
        // optional based on some setting/attribute in the future
        // If needed, adjust course->numsections
        //if ($numsections = $DB->get_field('course', 'numsections', array('id' => $this->get_courseid()))) {
        //    if ($numsections < $section->section) {
        //        $DB->set_field('course', 'numsections', $section->section, array('id' => $this->get_courseid()));
        //    }
        //}
    }

    /**
     * Process the legacy availability table record. This table does not exist
     * in Moodle 2.7+ but we still support restore.
     *
     * @param stdClass $data Record data
     */
    public function process_availability($data) {
        $data = (object)$data;
        // Simply going to store the whole availability record now, we'll process
        // all them later in the final task (once all activities have been restored)
        // Let's call the low level one to be able to store the whole object.
        $data->coursesectionid = $this->task->get_sectionid();
        restore_dbops::set_backup_ids_record($this->get_restoreid(),
                'section_availability', $data->id, 0, null, $data);
    }

    /**
     * Process the legacy availability fields table record. This table does not
     * exist in Moodle 2.7+ but we still support restore.
     *
     * @param stdClass $data Record data
     */
    public function process_availability_field($data) {
        global $DB;
        $data = (object)$data;
        // Mark it is as passed by default
        $passed = true;
        $customfieldid = null;

        // If a customfield has been used in order to pass we must be able to match an existing
        // customfield by name (data->customfield) and type (data->customfieldtype)
        if (is_null($data->customfield) xor is_null($data->customfieldtype)) {
            // xor is sort of uncommon. If either customfield is null or customfieldtype is null BUT not both.
            // If one is null but the other isn't something clearly went wrong and we'll skip this condition.
            $passed = false;
        } else if (!is_null($data->customfield)) {
            $params = array('shortname' => $data->customfield, 'datatype' => $data->customfieldtype);
            $customfieldid = $DB->get_field('user_info_field', 'id', $params);
            $passed = ($customfieldid !== false);
        }

        if ($passed) {
            // Create the object to insert into the database
            $availfield = new stdClass();
            $availfield->coursesectionid = $this->task->get_sectionid();
            $availfield->userfield = $data->userfield;
            $availfield->customfieldid = $customfieldid;
            $availfield->operator = $data->operator;
            $availfield->value = $data->value;

            // Get showavailability option.
            $showrec = restore_dbops::get_backup_ids_record($this->get_restoreid(),
                    'section_showavailability', $availfield->coursesectionid);
            if (!$showrec) {
                // Should not happen.
                throw new coding_exception('No matching showavailability record');
            }
            $show = $showrec->info->showavailability;

            // The $availfield object is now in the format used in the old
            // system. Interpret this and convert to new system.
            $currentvalue = $DB->get_field('course_sections', 'availability',
                    array('id' => $availfield->coursesectionid), MUST_EXIST);
            $newvalue = \core_availability\info::add_legacy_availability_field_condition(
                    $currentvalue, $availfield, $show);
            $DB->set_field('course_sections', 'availability', $newvalue,
                    array('id' => $availfield->coursesectionid));
        }
    }

    public function process_course_format_options($data) {
        global $DB;
        $courseid = $this->get_courseid();
        if (!array_key_exists($courseid, self::$courseformats)) {
            // It is safe to have a static cache of course formats because format can not be changed after this point.
            self::$courseformats[$courseid] = $DB->get_field('course', 'format', array('id' => $courseid));
        }
        $data = (array)$data;
        if (self::$courseformats[$courseid] === $data['format']) {
            // Import section format options only if both courses (the one that was backed up
            // and the one we are restoring into) have same formats.
            $params = array(
                'courseid' => $this->get_courseid(),
                'sectionid' => $this->task->get_sectionid(),
                'format' => $data['format'],
                'name' => $data['name']
            );
            if ($record = $DB->get_record('course_format_options', $params, 'id, value')) {
                // Do not overwrite existing information.
                $newid = $record->id;
            } else {
                $params['value'] = $data['value'];
                $newid = $DB->insert_record('course_format_options', $params);
            }
            $this->set_mapping('course_format_options', $data['id'], $newid);
        }
    }

    protected function after_execute() {
        // Add section related files, with 'course_section' itemid to match
        $this->add_related_files('course', 'section', 'course_section');
    }
}

/**
 * Structure step that will read the course.xml file, loading it and performing
 * various actions depending of the site/restore settings. Note that target
 * course always exist before arriving here so this step will be updating
 * the course record (never inserting)
 */
class restore_course_structure_step extends restore_structure_step {
    /**
     * @var bool this gets set to true by {@link process_course()} if we are
     * restoring an old coures that used the legacy 'module security' feature.
     * If so, we have to do more work in {@link after_execute()}.
     */
    protected $legacyrestrictmodules = false;

    /**
     * @var array Used when {@link $legacyrestrictmodules} is true. This is an
     * array with array keys the module names ('forum', 'quiz', etc.). These are
     * the modules that are allowed according to the data in the backup file.
     * In {@link after_execute()} we then have to prevent adding of all the other
     * types of activity.
     */
    protected $legacyallowedmodules = array();

    protected function define_structure() {

        $course = new restore_path_element('course', '/course');
        $category = new restore_path_element('category', '/course/category');
        $tag = new restore_path_element('tag', '/course/tags/tag');
        $allowed_module = new restore_path_element('allowed_module', '/course/allowed_modules/module');

        // Apply for 'format' plugins optional paths at course level
        $this->add_plugin_structure('format', $course);

        // Apply for 'theme' plugins optional paths at course level
        $this->add_plugin_structure('theme', $course);

        // Apply for 'report' plugins optional paths at course level
        $this->add_plugin_structure('report', $course);

        // Apply for 'course report' plugins optional paths at course level
        $this->add_plugin_structure('coursereport', $course);

        // Apply for plagiarism plugins optional paths at course level
        $this->add_plugin_structure('plagiarism', $course);

        // Apply for local plugins optional paths at course level
        $this->add_plugin_structure('local', $course);

        return array($course, $category, $tag, $allowed_module);
    }

    /**
     * Processing functions go here
     *
     * @global moodledatabase $DB
     * @param stdClass $data
     */
    public function process_course($data) {
        global $CFG, $DB;

        $data = (object)$data;

        $fullname  = $this->get_setting_value('course_fullname');
        $shortname = $this->get_setting_value('course_shortname');
        $startdate = $this->get_setting_value('course_startdate');

        // Calculate final course names, to avoid dupes
        list($fullname, $shortname) = restore_dbops::calculate_course_names($this->get_courseid(), $fullname, $shortname);

        // Need to change some fields before updating the course record
        $data->id = $this->get_courseid();
        $data->fullname = $fullname;
        $data->shortname= $shortname;

        // Only allow the idnumber to be set if the user has permission and the idnumber is not already in use by
        // another course on this site.
        $context = context::instance_by_id($this->task->get_contextid());
        if (!empty($data->idnumber) && has_capability('moodle/course:changeidnumber', $context, $this->task->get_userid()) &&
                $this->task->is_samesite() && !$DB->record_exists('course', array('idnumber' => $data->idnumber))) {
            // Do not reset idnumber.
        } else {
            $data->idnumber = '';
        }

        // Any empty value for course->hiddensections will lead to 0 (default, show collapsed).
        // It has been reported that some old 1.9 courses may have it null leading to DB error. MDL-31532
        if (empty($data->hiddensections)) {
            $data->hiddensections = 0;
        }

        // Set legacyrestrictmodules to true if the course was resticting modules. If so
        // then we will need to process restricted modules after execution.
        $this->legacyrestrictmodules = !empty($data->restrictmodules);

        $data->startdate= $this->apply_date_offset($data->startdate);
        if ($data->defaultgroupingid) {
            $data->defaultgroupingid = $this->get_mappingid('grouping', $data->defaultgroupingid);
        }
        if (empty($CFG->enablecompletion)) {
            $data->enablecompletion = 0;
            $data->completionstartonenrol = 0;
            $data->completionnotify = 0;
        }
        $languages = get_string_manager()->get_list_of_translations(); // Get languages for quick search
        if (!array_key_exists($data->lang, $languages)) {
            $data->lang = '';
        }

        $themes = get_list_of_themes(); // Get themes for quick search later
        if (!array_key_exists($data->theme, $themes) || empty($CFG->allowcoursethemes)) {
            $data->theme = '';
        }

        // Check if this is an old SCORM course format.
        if ($data->format == 'scorm') {
            $data->format = 'singleactivity';
            $data->activitytype = 'scorm';
        }

        // Course record ready, update it
        $DB->update_record('course', $data);

        course_get_format($data)->update_course_format_options($data);

        // Role name aliases
        restore_dbops::set_course_role_names($this->get_restoreid(), $this->get_courseid());
    }

    public function process_category($data) {
        // Nothing to do with the category. UI sets it before restore starts
    }

    public function process_tag($data) {
        global $CFG, $DB;

        $data = (object)$data;

        if (!empty($CFG->usetags)) { // if enabled in server
            // TODO: This is highly inneficient. Each time we add one tag
            // we fetch all the existing because tag_set() deletes them
            // so everything must be reinserted on each call
            $tags = array();
            $existingtags = tag_get_tags('course', $this->get_courseid());
            // Re-add all the existitng tags
            foreach ($existingtags as $existingtag) {
                $tags[] = $existingtag->rawname;
            }
            // Add the one being restored
            $tags[] = $data->rawname;
            // Send all the tags back to the course
            tag_set('course', $this->get_courseid(), $tags, 'core',
                context_course::instance($this->get_courseid())->id);
        }
    }

    public function process_allowed_module($data) {
        $data = (object)$data;

        // Backwards compatiblity support for the data that used to be in the
        // course_allowed_modules table.
        if ($this->legacyrestrictmodules) {
            $this->legacyallowedmodules[$data->modulename] = 1;
        }
    }

    protected function after_execute() {
        global $DB;

        // Add course related files, without itemid to match
        $this->add_related_files('course', 'summary', null);
        $this->add_related_files('course', 'overviewfiles', null);

        // Deal with legacy allowed modules.
        if ($this->legacyrestrictmodules) {
            $context = context_course::instance($this->get_courseid());

            list($roleids) = get_roles_with_cap_in_context($context, 'moodle/course:manageactivities');
            list($managerroleids) = get_roles_with_cap_in_context($context, 'moodle/site:config');
            foreach ($managerroleids as $roleid) {
                unset($roleids[$roleid]);
            }

            foreach (core_component::get_plugin_list('mod') as $modname => $notused) {
                if (isset($this->legacyallowedmodules[$modname])) {
                    // Module is allowed, no worries.
                    continue;
                }

                $capability = 'mod/' . $modname . ':addinstance';
                foreach ($roleids as $roleid) {
                    assign_capability($capability, CAP_PREVENT, $roleid, $context);
                }
            }
        }
    }
}

/**
 * Execution step that will migrate legacy files if present.
 */
class restore_course_legacy_files_step extends restore_execution_step {
    public function define_execution() {
        global $DB;

        // Do a check for legacy files and skip if there are none.
        $sql = 'SELECT count(*)
                  FROM {backup_files_temp}
                 WHERE backupid = ?
                   AND contextid = ?
                   AND component = ?
                   AND filearea  = ?';
        $params = array($this->get_restoreid(), $this->task->get_old_contextid(), 'course', 'legacy');

        if ($DB->count_records_sql($sql, $params)) {
            $DB->set_field('course', 'legacyfiles', 2, array('id' => $this->get_courseid()));
            restore_dbops::send_files_to_pool($this->get_basepath(), $this->get_restoreid(), 'course',
                'legacy', $this->task->get_old_contextid(), $this->task->get_userid());
        }
    }
}

/*
 * Structure step that will read the roles.xml file (at course/activity/block levels)
 * containing all the role_assignments and overrides for that context. If corresponding to
 * one mapped role, they will be applied to target context. Will observe the role_assignments
 * setting to decide if ras are restored.
 *
 * Note: this needs to be executed after all users are enrolled.
 */
class restore_ras_and_caps_structure_step extends restore_structure_step {
    protected $plugins = null;

    protected function define_structure() {

        $paths = array();

        // Observe the role_assignments setting
        if ($this->get_setting_value('role_assignments')) {
            $paths[] = new restore_path_element('assignment', '/roles/role_assignments/assignment');
        }
        $paths[] = new restore_path_element('override', '/roles/role_overrides/override');

        return $paths;
    }

    /**
     * Assign roles
     *
     * This has to be called after enrolments processing.
     *
     * @param mixed $data
     * @return void
     */
    public function process_assignment($data) {
        global $DB;

        $data = (object)$data;

        // Check roleid, userid are one of the mapped ones
        if (!$newroleid = $this->get_mappingid('role', $data->roleid)) {
            return;
        }
        if (!$newuserid = $this->get_mappingid('user', $data->userid)) {
            return;
        }
        if (!$DB->record_exists('user', array('id' => $newuserid, 'deleted' => 0))) {
            // Only assign roles to not deleted users
            return;
        }
        if (!$contextid = $this->task->get_contextid()) {
            return;
        }

        if (empty($data->component)) {
            // assign standard manual roles
            // TODO: role_assign() needs one userid param to be able to specify our restore userid
            role_assign($newroleid, $newuserid, $contextid);

        } else if ((strpos($data->component, 'enrol_') === 0)) {
            // Deal with enrolment roles - ignore the component and just find out the instance via new id,
            // it is possible that enrolment was restored using different plugin type.
            if (!isset($this->plugins)) {
                $this->plugins = enrol_get_plugins(true);
            }
            if ($enrolid = $this->get_mappingid('enrol', $data->itemid)) {
                if ($instance = $DB->get_record('enrol', array('id'=>$enrolid))) {
                    if (isset($this->plugins[$instance->enrol])) {
                        $this->plugins[$instance->enrol]->restore_role_assignment($instance, $newroleid, $newuserid, $contextid);
                    }
                }
            }

        } else {
            $data->roleid    = $newroleid;
            $data->userid    = $newuserid;
            $data->contextid = $contextid;
            $dir = core_component::get_component_directory($data->component);
            if ($dir and is_dir($dir)) {
                if (component_callback($data->component, 'restore_role_assignment', array($this, $data), true)) {
                    return;
                }
            }
            // Bad luck, plugin could not restore the data, let's add normal membership.
            role_assign($data->roleid, $data->userid, $data->contextid);
            $message = "Restore of '$data->component/$data->itemid' role assignments is not supported, using manual role assignments instead.";
            $this->log($message, backup::LOG_WARNING);
        }
    }

    public function process_override($data) {
        $data = (object)$data;

        // Check roleid is one of the mapped ones
        $newroleid = $this->get_mappingid('role', $data->roleid);
        // If newroleid and context are valid assign it via API (it handles dupes and so on)
        if ($newroleid && $this->task->get_contextid()) {
            // TODO: assign_capability() needs one userid param to be able to specify our restore userid
            // TODO: it seems that assign_capability() doesn't check for valid capabilities at all ???
            assign_capability($data->capability, $data->permission, $newroleid, $this->task->get_contextid());
        }
    }
}

/**
 * If no instances yet add default enrol methods the same way as when creating new course in UI.
 */
class restore_default_enrolments_step extends restore_execution_step {

    public function define_execution() {
        global $DB;

        // No enrolments in front page.
        if ($this->get_courseid() == SITEID) {
            return;
        }

        $course = $DB->get_record('course', array('id'=>$this->get_courseid()), '*', MUST_EXIST);

        if ($DB->record_exists('enrol', array('courseid'=>$this->get_courseid(), 'enrol'=>'manual'))) {
            // Something already added instances, do not add default instances.
            $plugins = enrol_get_plugins(true);
            foreach ($plugins as $plugin) {
                $plugin->restore_sync_course($course);
            }

        } else {
            // Looks like a newly created course.
            enrol_course_updated(true, $course, null);
        }
    }
}

/**
 * This structure steps restores the enrol plugins and their underlying
 * enrolments, performing all the mappings and/or movements required
 */
class restore_enrolments_structure_step extends restore_structure_step {
    protected $enrolsynced = false;
    protected $plugins = null;
    protected $originalstatus = array();

    /**
     * Conditionally decide if this step should be executed.
     *
     * This function checks the following parameter:
     *
     *   1. the course/enrolments.xml file exists
     *
     * @return bool true is safe to execute, false otherwise
     */
    protected function execute_condition() {

        if ($this->get_courseid() == SITEID) {
            return false;
        }

        // Check it is included in the backup
        $fullpath = $this->task->get_taskbasepath();
        $fullpath = rtrim($fullpath, '/') . '/' . $this->filename;
        if (!file_exists($fullpath)) {
            // Not found, can't restore enrolments info
            return false;
        }

        return true;
    }

    protected function define_structure() {

        $enrol = new restore_path_element('enrol', '/enrolments/enrols/enrol');
        $enrolment = new restore_path_element('enrolment', '/enrolments/enrols/enrol/user_enrolments/enrolment');
        // Attach local plugin stucture to enrol element.
        $this->add_plugin_structure('enrol', $enrol);

        return array($enrol, $enrolment);
    }

    /**
     * Create enrolment instances.
     *
     * This has to be called after creation of roles
     * and before adding of role assignments.
     *
     * @param mixed $data
     * @return void
     */
    public function process_enrol($data) {
        global $DB;

        $data = (object)$data;
        $oldid = $data->id; // We'll need this later.
        unset($data->id);

        $this->originalstatus[$oldid] = $data->status;

        if (!$courserec = $DB->get_record('course', array('id' => $this->get_courseid()))) {
            $this->set_mapping('enrol', $oldid, 0);
            return;
        }

        if (!isset($this->plugins)) {
            $this->plugins = enrol_get_plugins(true);
        }

        if (!$this->enrolsynced) {
            // Make sure that all plugin may create instances and enrolments automatically
            // before the first instance restore - this is suitable especially for plugins
            // that synchronise data automatically using course->idnumber or by course categories.
            foreach ($this->plugins as $plugin) {
                $plugin->restore_sync_course($courserec);
            }
            $this->enrolsynced = true;
        }

        // Map standard fields - plugin has to process custom fields manually.
        $data->roleid   = $this->get_mappingid('role', $data->roleid);
        $data->courseid = $courserec->id;

        if ($this->get_setting_value('enrol_migratetomanual')) {
            unset($data->sortorder); // Remove useless sortorder from <2.4 backups.
            if (!enrol_is_enabled('manual')) {
                $this->set_mapping('enrol', $oldid, 0);
                return;
            }
            if ($instances = $DB->get_records('enrol', array('courseid'=>$data->courseid, 'enrol'=>'manual'), 'id')) {
                $instance = reset($instances);
                $this->set_mapping('enrol', $oldid, $instance->id);
            } else {
                if ($data->enrol === 'manual') {
                    $instanceid = $this->plugins['manual']->add_instance($courserec, (array)$data);
                } else {
                    $instanceid = $this->plugins['manual']->add_default_instance($courserec);
                }
                $this->set_mapping('enrol', $oldid, $instanceid);
            }

        } else {
            if (!enrol_is_enabled($data->enrol) or !isset($this->plugins[$data->enrol])) {
                $this->set_mapping('enrol', $oldid, 0);
                $message = "Enrol plugin '$data->enrol' data can not be restored because it is not enabled, use migration to manual enrolments";
                $this->log($message, backup::LOG_WARNING);
                return;
            }
            if ($task = $this->get_task() and $task->get_target() == backup::TARGET_NEW_COURSE) {
                // Let's keep the sortorder in old backups.
            } else {
                // Prevent problems with colliding sortorders in old backups,
                // new 2.4 backups do not need sortorder because xml elements are ordered properly.
                unset($data->sortorder);
            }
            // Note: plugin is responsible for setting up the mapping, it may also decide to migrate to different type.
            $this->plugins[$data->enrol]->restore_instance($this, $data, $courserec, $oldid);
        }
    }

    /**
     * Create user enrolments.
     *
     * This has to be called after creation of enrolment instances
     * and before adding of role assignments.
     *
     * Roles are assigned in restore_ras_and_caps_structure_step::process_assignment() processing afterwards.
     *
     * @param mixed $data
     * @return void
     */
    public function process_enrolment($data) {
        global $DB;

        if (!isset($this->plugins)) {
            $this->plugins = enrol_get_plugins(true);
        }

        $data = (object)$data;

        // Process only if parent instance have been mapped.
        if ($enrolid = $this->get_new_parentid('enrol')) {
            $oldinstancestatus = ENROL_INSTANCE_ENABLED;
            $oldenrolid = $this->get_old_parentid('enrol');
            if (isset($this->originalstatus[$oldenrolid])) {
                $oldinstancestatus = $this->originalstatus[$oldenrolid];
            }
            if ($instance = $DB->get_record('enrol', array('id'=>$enrolid))) {
                // And only if user is a mapped one.
                if ($userid = $this->get_mappingid('user', $data->userid)) {
                    if (isset($this->plugins[$instance->enrol])) {
                        $this->plugins[$instance->enrol]->restore_user_enrolment($this, $data, $instance, $userid, $oldinstancestatus);
                    }
                }
            }
        }
    }
}


/**
 * Make sure the user restoring the course can actually access it.
 */
class restore_fix_restorer_access_step extends restore_execution_step {
    protected function define_execution() {
        global $CFG, $DB;

        if (!$userid = $this->task->get_userid()) {
            return;
        }

        if (empty($CFG->restorernewroleid)) {
            // Bad luck, no fallback role for restorers specified
            return;
        }

        $courseid = $this->get_courseid();
        $context = context_course::instance($courseid);

        if (is_enrolled($context, $userid, 'moodle/course:update', true) or is_viewing($context, $userid, 'moodle/course:update')) {
            // Current user may access the course (admin, category manager or restored teacher enrolment usually)
            return;
        }

        // Try to add role only - we do not need enrolment if user has moodle/course:view or is already enrolled
        role_assign($CFG->restorernewroleid, $userid, $context);

        if (is_enrolled($context, $userid, 'moodle/course:update', true) or is_viewing($context, $userid, 'moodle/course:update')) {
            // Extra role is enough, yay!
            return;
        }

        // The last chance is to create manual enrol if it does not exist and and try to enrol the current user,
        // hopefully admin selected suitable $CFG->restorernewroleid ...
        if (!enrol_is_enabled('manual')) {
            return;
        }
        if (!$enrol = enrol_get_plugin('manual')) {
            return;
        }
        if (!$DB->record_exists('enrol', array('enrol'=>'manual', 'courseid'=>$courseid))) {
            $course = $DB->get_record('course', array('id'=>$courseid), '*', MUST_EXIST);
            $fields = array('status'=>ENROL_INSTANCE_ENABLED, 'enrolperiod'=>$enrol->get_config('enrolperiod', 0), 'roleid'=>$enrol->get_config('roleid', 0));
            $enrol->add_instance($course, $fields);
        }

        enrol_try_internal_enrol($courseid, $userid);
    }
}


/**
 * This structure steps restores the filters and their configs
 */
class restore_filters_structure_step extends restore_structure_step {

    protected function define_structure() {

        $paths = array();

        $paths[] = new restore_path_element('active', '/filters/filter_actives/filter_active');
        $paths[] = new restore_path_element('config', '/filters/filter_configs/filter_config');

        return $paths;
    }

    public function process_active($data) {

        $data = (object)$data;

        if (strpos($data->filter, 'filter/') === 0) {
            $data->filter = substr($data->filter, 7);

        } else if (strpos($data->filter, '/') !== false) {
            // Unsupported old filter.
            return;
        }

        if (!filter_is_enabled($data->filter)) { // Not installed or not enabled, nothing to do
            return;
        }
        filter_set_local_state($data->filter, $this->task->get_contextid(), $data->active);
    }

    public function process_config($data) {

        $data = (object)$data;

        if (strpos($data->filter, 'filter/') === 0) {
            $data->filter = substr($data->filter, 7);

        } else if (strpos($data->filter, '/') !== false) {
            // Unsupported old filter.
            return;
        }

        if (!filter_is_enabled($data->filter)) { // Not installed or not enabled, nothing to do
            return;
        }
        filter_set_local_config($data->filter, $this->task->get_contextid(), $data->name, $data->value);
    }
}


/**
 * This structure steps restores the comments
 * Note: Cannot use the comments API because defaults to USER->id.
 * That should change allowing to pass $userid
 */
class restore_comments_structure_step extends restore_structure_step {

    protected function define_structure() {

        $paths = array();

        $paths[] = new restore_path_element('comment', '/comments/comment');

        return $paths;
    }

    public function process_comment($data) {
        global $DB;

        $data = (object)$data;

        // First of all, if the comment has some itemid, ask to the task what to map
        $mapping = false;
        if ($data->itemid) {
            $mapping = $this->task->get_comment_mapping_itemname($data->commentarea);
            $data->itemid = $this->get_mappingid($mapping, $data->itemid);
        }
        // Only restore the comment if has no mapping OR we have found the matching mapping
        if (!$mapping || $data->itemid) {
            // Only if user mapping and context
            $data->userid = $this->get_mappingid('user', $data->userid);
            if ($data->userid && $this->task->get_contextid()) {
                $data->contextid = $this->task->get_contextid();
                // Only if there is another comment with same context/user/timecreated
                $params = array('contextid' => $data->contextid, 'userid' => $data->userid, 'timecreated' => $data->timecreated);
                if (!$DB->record_exists('comments', $params)) {
                    $DB->insert_record('comments', $data);
                }
            }
        }
    }
}

/**
 * This structure steps restores the badges and their configs
 */
class restore_badges_structure_step extends restore_structure_step {

    /**
     * Conditionally decide if this step should be executed.
     *
     * This function checks the following parameters:
     *
     *   1. Badges and course badges are enabled on the site.
     *   2. The course/badges.xml file exists.
     *   3. All modules are restorable.
     *   4. All modules are marked for restore.
     *
     * @return bool True is safe to execute, false otherwise
     */
    protected function execute_condition() {
        global $CFG;

        // First check is badges and course level badges are enabled on this site.
        if (empty($CFG->enablebadges) || empty($CFG->badges_allowcoursebadges)) {
            // Disabled, don't restore course badges.
            return false;
        }

        // Check if badges.xml is included in the backup.
        $fullpath = $this->task->get_taskbasepath();
        $fullpath = rtrim($fullpath, '/') . '/' . $this->filename;
        if (!file_exists($fullpath)) {
            // Not found, can't restore course badges.
            return false;
        }

        // Check we are able to restore all backed up modules.
        if ($this->task->is_missing_modules()) {
            return false;
        }

        // Finally check all modules within the backup are being restored.
        if ($this->task->is_excluding_activities()) {
            return false;
        }

        return true;
    }

    protected function define_structure() {
        $paths = array();
        $paths[] = new restore_path_element('badge', '/badges/badge');
        $paths[] = new restore_path_element('criterion', '/badges/badge/criteria/criterion');
        $paths[] = new restore_path_element('parameter', '/badges/badge/criteria/criterion/parameters/parameter');
        $paths[] = new restore_path_element('manual_award', '/badges/badge/manual_awards/manual_award');

        return $paths;
    }

    public function process_badge($data) {
        global $DB, $CFG;

        require_once($CFG->libdir . '/badgeslib.php');

        $data = (object)$data;
        $data->usercreated = $this->get_mappingid('user', $data->usercreated);
        if (empty($data->usercreated)) {
            $data->usercreated = $this->task->get_userid();
        }
        $data->usermodified = $this->get_mappingid('user', $data->usermodified);
        if (empty($data->usermodified)) {
            $data->usermodified = $this->task->get_userid();
        }

        // We'll restore the badge image.
        $restorefiles = true;

        $courseid = $this->get_courseid();

        $params = array(
                'name'           => $data->name,
                'description'    => $data->description,
                'timecreated'    => $this->apply_date_offset($data->timecreated),
                'timemodified'   => $this->apply_date_offset($data->timemodified),
                'usercreated'    => $data->usercreated,
                'usermodified'   => $data->usermodified,
                'issuername'     => $data->issuername,
                'issuerurl'      => $data->issuerurl,
                'issuercontact'  => $data->issuercontact,
                'expiredate'     => $this->apply_date_offset($data->expiredate),
                'expireperiod'   => $data->expireperiod,
                'type'           => BADGE_TYPE_COURSE,
                'courseid'       => $courseid,
                'message'        => $data->message,
                'messagesubject' => $data->messagesubject,
                'attachment'     => $data->attachment,
                'notification'   => $data->notification,
                'status'         => BADGE_STATUS_INACTIVE,
                'nextcron'       => $this->apply_date_offset($data->nextcron)
        );

        $newid = $DB->insert_record('badge', $params);
        $this->set_mapping('badge', $data->id, $newid, $restorefiles);
    }

    public function process_criterion($data) {
        global $DB;

        $data = (object)$data;

        $params = array(
                'badgeid'           => $this->get_new_parentid('badge'),
                'criteriatype'      => $data->criteriatype,
                'method'            => $data->method,
                'description'       => isset($data->description) ? $data->description : '',
                'descriptionformat' => isset($data->descriptionformat) ? $data->descriptionformat : 0,
        );
        $newid = $DB->insert_record('badge_criteria', $params);
        $this->set_mapping('criterion', $data->id, $newid);
    }

    public function process_parameter($data) {
        global $DB, $CFG;

        require_once($CFG->libdir . '/badgeslib.php');

        $data = (object)$data;
        $criteriaid = $this->get_new_parentid('criterion');

        // Parameter array that will go to database.
        $params = array();
        $params['critid'] = $criteriaid;

        $oldparam = explode('_', $data->name);

        if ($data->criteriatype == BADGE_CRITERIA_TYPE_ACTIVITY) {
            $module = $this->get_mappingid('course_module', $oldparam[1]);
            $params['name'] = $oldparam[0] . '_' . $module;
            $params['value'] = $oldparam[0] == 'module' ? $module : $data->value;
        } else if ($data->criteriatype == BADGE_CRITERIA_TYPE_COURSE) {
            $params['name'] = $oldparam[0] . '_' . $this->get_courseid();
            $params['value'] = $oldparam[0] == 'course' ? $this->get_courseid() : $data->value;
        } else if ($data->criteriatype == BADGE_CRITERIA_TYPE_MANUAL) {
            $role = $this->get_mappingid('role', $data->value);
            if (!empty($role)) {
                $params['name'] = 'role_' . $role;
                $params['value'] = $role;
            } else {
                return;
            }
        }

        if (!$DB->record_exists('badge_criteria_param', $params)) {
            $DB->insert_record('badge_criteria_param', $params);
        }
    }

    public function process_manual_award($data) {
        global $DB;

        $data = (object)$data;
        $role = $this->get_mappingid('role', $data->issuerrole);

        if (!empty($role)) {
            $award = array(
                'badgeid'     => $this->get_new_parentid('badge'),
                'recipientid' => $this->get_mappingid('user', $data->recipientid),
                'issuerid'    => $this->get_mappingid('user', $data->issuerid),
                'issuerrole'  => $role,
                'datemet'     => $this->apply_date_offset($data->datemet)
            );

            // Skip the manual award if recipient or issuer can not be mapped to.
            if (empty($award['recipientid']) || empty($award['issuerid'])) {
                return;
            }

            $DB->insert_record('badge_manual_award', $award);
        }
    }

    protected function after_execute() {
        // Add related files.
        $this->add_related_files('badges', 'badgeimage', 'badge');
    }
}

/**
 * This structure steps restores the calendar events
 */
class restore_calendarevents_structure_step extends restore_structure_step {

    protected function define_structure() {

        $paths = array();

        $paths[] = new restore_path_element('calendarevents', '/events/event');

        return $paths;
    }

    public function process_calendarevents($data) {
        global $DB, $SITE, $USER;

        $data = (object)$data;
        $oldid = $data->id;
        $restorefiles = true; // We'll restore the files
        // Find the userid and the groupid associated with the event.
        $data->userid = $this->get_mappingid('user', $data->userid);
        if ($data->userid === false) {
            // Blank user ID means that we are dealing with module generated events such as quiz starting times.
            // Use the current user ID for these events.
            $data->userid = $USER->id;
        }
        if (!empty($data->groupid)) {
            $data->groupid = $this->get_mappingid('group', $data->groupid);
            if ($data->groupid === false) {
                return;
            }
        }
        // Handle events with empty eventtype //MDL-32827
        if(empty($data->eventtype)) {
            if ($data->courseid == $SITE->id) {                                // Site event
                $data->eventtype = "site";
            } else if ($data->courseid != 0 && $data->groupid == 0 && ($data->modulename == 'assignment' || $data->modulename == 'assign')) {
                // Course assingment event
                $data->eventtype = "due";
            } else if ($data->courseid != 0 && $data->groupid == 0) {      // Course event
                $data->eventtype = "course";
            } else if ($data->groupid) {                                      // Group event
                $data->eventtype = "group";
            } else if ($data->userid) {                                       // User event
                $data->eventtype = "user";
            } else {
                return;
            }
        }

        $params = array(
                'name'           => $data->name,
                'description'    => $data->description,
                'format'         => $data->format,
                'courseid'       => $this->get_courseid(),
                'groupid'        => $data->groupid,
                'userid'         => $data->userid,
                'repeatid'       => $data->repeatid,
                'modulename'     => $data->modulename,
                'eventtype'      => $data->eventtype,
                'timestart'      => $this->apply_date_offset($data->timestart),
                'timeduration'   => $data->timeduration,
                'visible'        => $data->visible,
                'uuid'           => $data->uuid,
                'sequence'       => $data->sequence,
                'timemodified'    => $this->apply_date_offset($data->timemodified));
        if ($this->name == 'activity_calendar') {
            $params['instance'] = $this->task->get_activityid();
        } else {
            $params['instance'] = 0;
        }
        $sql = "SELECT id
                  FROM {event}
                 WHERE " . $DB->sql_compare_text('name', 255) . " = " . $DB->sql_compare_text('?', 255) . "
                   AND courseid = ?
                   AND repeatid = ?
                   AND modulename = ?
                   AND timestart = ?
                   AND timeduration = ?
                   AND " . $DB->sql_compare_text('description', 255) . " = " . $DB->sql_compare_text('?', 255);
        $arg = array ($params['name'], $params['courseid'], $params['repeatid'], $params['modulename'], $params['timestart'], $params['timeduration'], $params['description']);
        $result = $DB->record_exists_sql($sql, $arg);
        if (empty($result)) {
            $newitemid = $DB->insert_record('event', $params);
            $this->set_mapping('event', $oldid, $newitemid);
            $this->set_mapping('event_description', $oldid, $newitemid, $restorefiles);
        }

    }
    protected function after_execute() {
        // Add related files
        $this->add_related_files('calendar', 'event_description', 'event_description');
    }
}

class restore_course_completion_structure_step extends restore_structure_step {

    /**
     * Conditionally decide if this step should be executed.
     *
     * This function checks parameters that are not immediate settings to ensure
     * that the enviroment is suitable for the restore of course completion info.
     *
     * This function checks the following four parameters:
     *
     *   1. Course completion is enabled on the site
     *   2. The backup includes course completion information
     *   3. All modules are restorable
     *   4. All modules are marked for restore.
     *   5. No completion criteria already exist for the course.
     *
     * @return bool True is safe to execute, false otherwise
     */
    protected function execute_condition() {
        global $CFG, $DB;

        // First check course completion is enabled on this site
        if (empty($CFG->enablecompletion)) {
            // Disabled, don't restore course completion
            return false;
        }

        // No course completion on the front page.
        if ($this->get_courseid() == SITEID) {
            return false;
        }

        // Check it is included in the backup
        $fullpath = $this->task->get_taskbasepath();
        $fullpath = rtrim($fullpath, '/') . '/' . $this->filename;
        if (!file_exists($fullpath)) {
            // Not found, can't restore course completion
            return false;
        }

        // Check we are able to restore all backed up modules
        if ($this->task->is_missing_modules()) {
            return false;
        }

        // Check all modules within the backup are being restored.
        if ($this->task->is_excluding_activities()) {
            return false;
        }

        // Check that no completion criteria is already set for the course.
        if ($DB->record_exists('course_completion_criteria', array('course' => $this->get_courseid()))) {
            return false;
        }

        return true;
    }

    /**
     * Define the course completion structure
     *
     * @return array Array of restore_path_element
     */
    protected function define_structure() {

        // To know if we are including user completion info
        $userinfo = $this->get_setting_value('userscompletion');

        $paths = array();
        $paths[] = new restore_path_element('course_completion_criteria', '/course_completion/course_completion_criteria');
        $paths[] = new restore_path_element('course_completion_aggr_methd', '/course_completion/course_completion_aggr_methd');

        if ($userinfo) {
            $paths[] = new restore_path_element('course_completion_crit_compl', '/course_completion/course_completion_criteria/course_completion_crit_completions/course_completion_crit_compl');
            $paths[] = new restore_path_element('course_completions', '/course_completion/course_completions');
        }

        return $paths;

    }

    /**
     * Process course completion criteria
     *
     * @global moodle_database $DB
     * @param stdClass $data
     */
    public function process_course_completion_criteria($data) {
        global $DB;

        $data = (object)$data;
        $data->course = $this->get_courseid();

        // Apply the date offset to the time end field
        $data->timeend = $this->apply_date_offset($data->timeend);

        // Map the role from the criteria
        if (isset($data->role) && $data->role != '') {
            // Newer backups should include roleshortname, which makes this much easier.
            if (!empty($data->roleshortname)) {
                $roleinstanceid = $DB->get_field('role', 'id', array('shortname' => $data->roleshortname));
                if (!$roleinstanceid) {
                    $this->log(
                        'Could not match the role shortname in course_completion_criteria, so skipping',
                        backup::LOG_DEBUG
                    );
                    return;
                }
                $data->role = $roleinstanceid;
            } else {
                $data->role = $this->get_mappingid('role', $data->role);
            }

            // Check we have an id, otherwise it causes all sorts of bugs.
            if (!$data->role) {
                $this->log(
                    'Could not match role in course_completion_criteria, so skipping',
                    backup::LOG_DEBUG
                );
                return;
            }
        }

        // If the completion criteria is for a module we need to map the module instance
        // to the new module id.
        if (!empty($data->moduleinstance) && !empty($data->module)) {
            $data->moduleinstance = $this->get_mappingid('course_module', $data->moduleinstance);
            if (empty($data->moduleinstance)) {
                $this->log(
                    'Could not match the module instance in course_completion_criteria, so skipping',
                    backup::LOG_DEBUG
                );
                return;
            }
        } else {
            $data->module = null;
            $data->moduleinstance = null;
        }

        // We backup the course shortname rather than the ID so that we can match back to the course
        if (!empty($data->courseinstanceshortname)) {
            $courseinstanceid = $DB->get_field('course', 'id', array('shortname'=>$data->courseinstanceshortname));
            if (!$courseinstanceid) {
                $this->log(
                    'Could not match the course instance in course_completion_criteria, so skipping',
                    backup::LOG_DEBUG
                );
                return;
            }
        } else {
            $courseinstanceid = null;
        }
        $data->courseinstance = $courseinstanceid;

        $params = array(
            'course'         => $data->course,
            'criteriatype'   => $data->criteriatype,
            'enrolperiod'    => $data->enrolperiod,
            'courseinstance' => $data->courseinstance,
            'module'         => $data->module,
            'moduleinstance' => $data->moduleinstance,
            'timeend'        => $data->timeend,
            'gradepass'      => $data->gradepass,
            'role'           => $data->role
        );
        $newid = $DB->insert_record('course_completion_criteria', $params);
        $this->set_mapping('course_completion_criteria', $data->id, $newid);
    }

    /**
     * Processes course compltion criteria complete records
     *
     * @global moodle_database $DB
     * @param stdClass $data
     */
    public function process_course_completion_crit_compl($data) {
        global $DB;

        $data = (object)$data;

        // This may be empty if criteria could not be restored
        $data->criteriaid = $this->get_mappingid('course_completion_criteria', $data->criteriaid);

        $data->course = $this->get_courseid();
        $data->userid = $this->get_mappingid('user', $data->userid);

        if (!empty($data->criteriaid) && !empty($data->userid)) {
            $params = array(
                'userid' => $data->userid,
                'course' => $data->course,
                'criteriaid' => $data->criteriaid,
                'timecompleted' => $this->apply_date_offset($data->timecompleted)
            );
            if (isset($data->gradefinal)) {
                $params['gradefinal'] = $data->gradefinal;
            }
            if (isset($data->unenroled)) {
                $params['unenroled'] = $data->unenroled;
            }
            $DB->insert_record('course_completion_crit_compl', $params);
        }
    }

    /**
     * Process course completions
     *
     * @global moodle_database $DB
     * @param stdClass $data
     */
    public function process_course_completions($data) {
        global $DB;

        $data = (object)$data;

        $data->course = $this->get_courseid();
        $data->userid = $this->get_mappingid('user', $data->userid);

        if (!empty($data->userid)) {
            $params = array(
                'userid' => $data->userid,
                'course' => $data->course,
                'timeenrolled' => $this->apply_date_offset($data->timeenrolled),
                'timestarted' => $this->apply_date_offset($data->timestarted),
                'timecompleted' => $this->apply_date_offset($data->timecompleted),
                'reaggregate' => $data->reaggregate
            );

            $existing = $DB->get_record('course_completions', array(
                'userid' => $data->userid,
                'course' => $data->course
            ));

            // MDL-46651 - If cron writes out a new record before we get to it
            // then we should replace it with the Truth data from the backup.
            // This may be obsolete after MDL-48518 is resolved
            if ($existing) {
                $params['id'] = $existing->id;
                $DB->update_record('course_completions', $params);
            } else {
                $DB->insert_record('course_completions', $params);
            }
        }
    }

    /**
     * Process course completion aggregate methods
     *
     * @global moodle_database $DB
     * @param stdClass $data
     */
    public function process_course_completion_aggr_methd($data) {
        global $DB;

        $data = (object)$data;

        $data->course = $this->get_courseid();

        // Only create the course_completion_aggr_methd records if
        // the target course has not them defined. MDL-28180
        if (!$DB->record_exists('course_completion_aggr_methd', array(
                    'course' => $data->course,
                    'criteriatype' => $data->criteriatype))) {
            $params = array(
                'course' => $data->course,
                'criteriatype' => $data->criteriatype,
                'method' => $data->method,
                'value' => $data->value,
            );
            $DB->insert_record('course_completion_aggr_methd', $params);
        }
    }
}


/**
 * This structure step restores course logs (cmid = 0), delegating
 * the hard work to the corresponding {@link restore_logs_processor} passing the
 * collection of {@link restore_log_rule} rules to be observed as they are defined
 * by the task. Note this is only executed based in the 'logs' setting.
 *
 * NOTE: This is executed by final task, to have all the activities already restored
 *
 * NOTE: Not all course logs are being restored. For now only 'course' and 'user'
 * records are. There are others like 'calendar' and 'upload' that will be handled
 * later.
 *
 * NOTE: All the missing actions (not able to be restored) are sent to logs for
 * debugging purposes
 */
class restore_course_logs_structure_step extends restore_structure_step {

    /**
     * Conditionally decide if this step should be executed.
     *
     * This function checks the following parameter:
     *
     *   1. the course/logs.xml file exists
     *
     * @return bool true is safe to execute, false otherwise
     */
    protected function execute_condition() {

        // Check it is included in the backup
        $fullpath = $this->task->get_taskbasepath();
        $fullpath = rtrim($fullpath, '/') . '/' . $this->filename;
        if (!file_exists($fullpath)) {
            // Not found, can't restore course logs
            return false;
        }

        return true;
    }

    protected function define_structure() {

        $paths = array();

        // Simple, one plain level of information contains them
        $paths[] = new restore_path_element('log', '/logs/log');

        return $paths;
    }

    protected function process_log($data) {
        global $DB;

        $data = (object)($data);

        $data->time = $this->apply_date_offset($data->time);
        $data->userid = $this->get_mappingid('user', $data->userid);
        $data->course = $this->get_courseid();
        $data->cmid = 0;

        // For any reason user wasn't remapped ok, stop processing this
        if (empty($data->userid)) {
            return;
        }

        // Everything ready, let's delegate to the restore_logs_processor

        // Set some fixed values that will save tons of DB requests
        $values = array(
            'course' => $this->get_courseid());
        // Get instance and process log record
        $data = restore_logs_processor::get_instance($this->task, $values)->process_log_record($data);

        // If we have data, insert it, else something went wrong in the restore_logs_processor
        if ($data) {
            if (empty($data->url)) {
                $data->url = '';
            }
            if (empty($data->info)) {
                $data->info = '';
            }
            // Store the data in the legacy log table if we are still using it.
            $manager = get_log_manager();
            if (method_exists($manager, 'legacy_add_to_log')) {
                $manager->legacy_add_to_log($data->course, $data->module, $data->action, $data->url,
                    $data->info, $data->cmid, $data->userid, $data->ip, $data->time);
            }
        }
    }
}

/**
 * This structure step restores activity logs, extending {@link restore_course_logs_structure_step}
 * sharing its same structure but modifying the way records are handled
 */
class restore_activity_logs_structure_step extends restore_course_logs_structure_step {

    protected function process_log($data) {
        global $DB;

        $data = (object)($data);

        $data->time = $this->apply_date_offset($data->time);
        $data->userid = $this->get_mappingid('user', $data->userid);
        $data->course = $this->get_courseid();
        $data->cmid = $this->task->get_moduleid();

        // For any reason user wasn't remapped ok, stop processing this
        if (empty($data->userid)) {
            return;
        }

        // Everything ready, let's delegate to the restore_logs_processor

        // Set some fixed values that will save tons of DB requests
        $values = array(
            'course' => $this->get_courseid(),
            'course_module' => $this->task->get_moduleid(),
            $this->task->get_modulename() => $this->task->get_activityid());
        // Get instance and process log record
        $data = restore_logs_processor::get_instance($this->task, $values)->process_log_record($data);

        // If we have data, insert it, else something went wrong in the restore_logs_processor
        if ($data) {
            if (empty($data->url)) {
                $data->url = '';
            }
            if (empty($data->info)) {
                $data->info = '';
            }
            // Store the data in the legacy log table if we are still using it.
            $manager = get_log_manager();
            if (method_exists($manager, 'legacy_add_to_log')) {
                $manager->legacy_add_to_log($data->course, $data->module, $data->action, $data->url,
                    $data->info, $data->cmid, $data->userid, $data->ip, $data->time);
            }
        }
    }
}


/**
 * Defines the restore step for advanced grading methods attached to the activity module
 */
class restore_activity_grading_structure_step extends restore_structure_step {

    /**
     * This step is executed only if the grading file is present
     */
     protected function execute_condition() {

        if ($this->get_courseid() == SITEID) {
            return false;
        }

        $fullpath = $this->task->get_taskbasepath();
        $fullpath = rtrim($fullpath, '/') . '/' . $this->filename;
        if (!file_exists($fullpath)) {
            return false;
        }

        return true;
    }


    /**
     * Declares paths in the grading.xml file we are interested in
     */
    protected function define_structure() {

        $paths = array();
        $userinfo = $this->get_setting_value('userinfo');

        $area = new restore_path_element('grading_area', '/areas/area');
        $paths[] = $area;
        // attach local plugin stucture to $area element
        $this->add_plugin_structure('local', $area);

        $definition = new restore_path_element('grading_definition', '/areas/area/definitions/definition');
        $paths[] = $definition;
        $this->add_plugin_structure('gradingform', $definition);
        // attach local plugin stucture to $definition element
        $this->add_plugin_structure('local', $definition);


        if ($userinfo) {
            $instance = new restore_path_element('grading_instance',
                '/areas/area/definitions/definition/instances/instance');
            $paths[] = $instance;
            $this->add_plugin_structure('gradingform', $instance);
            // attach local plugin stucture to $intance element
            $this->add_plugin_structure('local', $instance);
        }

        return $paths;
    }

    /**
     * Processes one grading area element
     *
     * @param array $data element data
     */
    protected function process_grading_area($data) {
        global $DB;

        $task = $this->get_task();
        $data = (object)$data;
        $oldid = $data->id;
        $data->component = 'mod_'.$task->get_modulename();
        $data->contextid = $task->get_contextid();

        $newid = $DB->insert_record('grading_areas', $data);
        $this->set_mapping('grading_area', $oldid, $newid);
    }

    /**
     * Processes one grading definition element
     *
     * @param array $data element data
     */
    protected function process_grading_definition($data) {
        global $DB;

        $task = $this->get_task();
        $data = (object)$data;
        $oldid = $data->id;
        $data->areaid = $this->get_new_parentid('grading_area');
        $data->copiedfromid = null;
        $data->timecreated = time();
        $data->usercreated = $task->get_userid();
        $data->timemodified = $data->timecreated;
        $data->usermodified = $data->usercreated;

        $newid = $DB->insert_record('grading_definitions', $data);
        $this->set_mapping('grading_definition', $oldid, $newid, true);
    }

    /**
     * Processes one grading form instance element
     *
     * @param array $data element data
     */
    protected function process_grading_instance($data) {
        global $DB;

        $data = (object)$data;

        // new form definition id
        $newformid = $this->get_new_parentid('grading_definition');

        // get the name of the area we are restoring to
        $sql = "SELECT ga.areaname
                  FROM {grading_definitions} gd
                  JOIN {grading_areas} ga ON gd.areaid = ga.id
                 WHERE gd.id = ?";
        $areaname = $DB->get_field_sql($sql, array($newformid), MUST_EXIST);

        // get the mapped itemid - the activity module is expected to define the mappings
        // for each gradable area
        $newitemid = $this->get_mappingid(restore_gradingform_plugin::itemid_mapping($areaname), $data->itemid);

        $oldid = $data->id;
        $data->definitionid = $newformid;
        $data->raterid = $this->get_mappingid('user', $data->raterid);
        $data->itemid = $newitemid;

        $newid = $DB->insert_record('grading_instances', $data);
        $this->set_mapping('grading_instance', $oldid, $newid);
    }

    /**
     * Final operations when the database records are inserted
     */
    protected function after_execute() {
        // Add files embedded into the definition description
        $this->add_related_files('grading', 'description', 'grading_definition');
    }
}


/**
 * This structure step restores the grade items associated with one activity
 * All the grade items are made child of the "course" grade item but the original
 * categoryid is saved as parentitemid in the backup_ids table, so, when restoring
 * the complete gradebook (categories and calculations), that information is
 * available there
 */
class restore_activity_grades_structure_step extends restore_structure_step {

    /**
     * No grades in front page.
     * @return bool
     */
    protected function execute_condition() {
        return ($this->get_courseid() != SITEID);
    }

    protected function define_structure() {

        $paths = array();
        $userinfo = $this->get_setting_value('userinfo');

        $paths[] = new restore_path_element('grade_item', '/activity_gradebook/grade_items/grade_item');
        $paths[] = new restore_path_element('grade_letter', '/activity_gradebook/grade_letters/grade_letter');
        if ($userinfo) {
            $paths[] = new restore_path_element('grade_grade',
                           '/activity_gradebook/grade_items/grade_item/grade_grades/grade_grade');
        }
        return $paths;
    }

    protected function process_grade_item($data) {
        global $DB;

        $data = (object)($data);
        $oldid       = $data->id;        // We'll need these later
        $oldparentid = $data->categoryid;
        $courseid = $this->get_courseid();

        $idnumber = null;
        if (!empty($data->idnumber)) {
            // Don't get any idnumber from course module. Keep them as they are in grade_item->idnumber
            // Reason: it's not clear what happens with outcomes->idnumber or activities with multiple items (workshop)
            // so the best is to keep the ones already in the gradebook
            // Potential problem: duplicates if same items are restored more than once. :-(
            // This needs to be fixed in some way (outcomes & activities with multiple items)
            // $data->idnumber     = get_coursemodule_from_instance($data->itemmodule, $data->iteminstance)->idnumber;
            // In any case, verify always for uniqueness
            $sql = "SELECT cm.id
                      FROM {course_modules} cm
                     WHERE cm.course = :courseid AND
                           cm.idnumber = :idnumber AND
                           cm.id <> :cmid";
            $params = array(
                'courseid' => $courseid,
                'idnumber' => $data->idnumber,
                'cmid' => $this->task->get_moduleid()
            );
            if (!$DB->record_exists_sql($sql, $params) && !$DB->record_exists('grade_items', array('courseid' => $courseid, 'idnumber' => $data->idnumber))) {
                $idnumber = $data->idnumber;
            }
        }

        if (!empty($data->categoryid)) {
            // If the grade category id of the grade item being restored belongs to this course
            // then it is a fair assumption that this is the correct grade category for the activity
            // and we should leave it in place, if not then unset it.
            // TODO MDL-34790 Gradebook does not import if target course has gradebook categories.
            $conditions = array('id' => $data->categoryid, 'courseid' => $courseid);
            if (!$this->task->is_samesite() || !$DB->record_exists('grade_categories', $conditions)) {
                unset($data->categoryid);
            }
        }

        unset($data->id);
        $data->courseid     = $this->get_courseid();
        $data->iteminstance = $this->task->get_activityid();
        $data->idnumber     = $idnumber;
        $data->scaleid      = $this->get_mappingid('scale', $data->scaleid);
        $data->outcomeid    = $this->get_mappingid('outcome', $data->outcomeid);
        $data->timecreated  = $this->apply_date_offset($data->timecreated);
        $data->timemodified = $this->apply_date_offset($data->timemodified);

        $gradeitem = new grade_item($data, false);
        $gradeitem->insert('restore');

        //sortorder is automatically assigned when inserting. Re-instate the previous sortorder
        $gradeitem->sortorder = $data->sortorder;
        $gradeitem->update('restore');

        // Set mapping, saving the original category id into parentitemid
        // gradebook restore (final task) will need it to reorganise items
        $this->set_mapping('grade_item', $oldid, $gradeitem->id, false, null, $oldparentid);
    }

    protected function process_grade_grade($data) {
        $data = (object)($data);
        $olduserid = $data->userid;
        $oldid = $data->id;
        unset($data->id);

        $data->itemid = $this->get_new_parentid('grade_item');

        $data->userid = $this->get_mappingid('user', $data->userid, null);
        if (!empty($data->userid)) {
            $data->usermodified = $this->get_mappingid('user', $data->usermodified, null);
            $data->rawscaleid = $this->get_mappingid('scale', $data->rawscaleid);
            // TODO: Ask, all the rest of locktime/exported... work with time... to be rolled?
            $data->overridden = $this->apply_date_offset($data->overridden);

            $grade = new grade_grade($data, false);
            $grade->insert('restore');
            $this->set_mapping('grade_grades', $oldid, $grade->id);
        } else {
            debugging("Mapped user id not found for user id '{$olduserid}', grade item id '{$data->itemid}'");
        }
    }

    /**
     * process activity grade_letters. Note that, while these are possible,
     * because grade_letters are contextid based, in practice, only course
     * context letters can be defined. So we keep here this method knowing
     * it won't be executed ever. gradebook restore will restore course letters.
     */
    protected function process_grade_letter($data) {
        global $DB;

        $data['contextid'] = $this->task->get_contextid();
        $gradeletter = (object)$data;

        // Check if it exists before adding it
        unset($data['id']);
        if (!$DB->record_exists('grade_letters', $data)) {
            $newitemid = $DB->insert_record('grade_letters', $gradeletter);
        }
        // no need to save any grade_letter mapping
    }

    public function after_restore() {
        // Fix grade item's sortorder after restore, as it might have duplicates.
        $courseid = $this->get_task()->get_courseid();
        grade_item::fix_duplicate_sortorder($courseid);
    }
}

/**
 * Step in charge of restoring the grade history of an activity.
 *
 * This step is added to the task regardless of the setting 'grade_histories'.
 * The reason is to allow for a more flexible step in case the logic needs to be
 * split accross different settings to control the history of items and/or grades.
 */
class restore_activity_grade_history_structure_step extends restore_structure_step {

    /**
     * This step is executed only if the grade history file is present.
     */
     protected function execute_condition() {

        if ($this->get_courseid() == SITEID) {
            return false;
        }

        $fullpath = $this->task->get_taskbasepath();
        $fullpath = rtrim($fullpath, '/') . '/' . $this->filename;
        if (!file_exists($fullpath)) {
            return false;
        }
        return true;
    }

    protected function define_structure() {
        $paths = array();

        // Settings to use.
        $userinfo = $this->get_setting_value('userinfo');
        $history = $this->get_setting_value('grade_histories');

        if ($userinfo && $history) {
            $paths[] = new restore_path_element('grade_grade',
               '/grade_history/grade_grades/grade_grade');
        }

        return $paths;
    }