<?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/>.

/**
 * This file keeps track of upgrades to the navigation block
 *
 * Sometimes, changes between versions involve alterations to database structures
 * and other major things that may break installations.
 *
 * The upgrade function in this file will attempt to perform all the necessary
 * actions to upgrade your older installation to the current version.
 *
 * If there's something it cannot do itself, it will tell you what you need to do.
 *
 * The commands in here will all be database-neutral, using the methods of
 * database_manager class
 *
 * Please do not forget to use upgrade_set_timeout()
 * before any action that may take longer time to finish.
 *
 * @since 2.0
 * @package blocks
 * @copyright 2009 Sam Hemelryk
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

/**
 * As of the implementation of this block and the general navigation code
 * in Moodle 2.0 the body of immediate upgrade work for this block and
 * settings is done in core upgrade {@see lib/db/upgrade.php}
 *
 * There were several reasons that they were put there and not here, both becuase
 * the process for the two blocks was very similar and because the upgrade process
 * was complex due to us wanting to remvoe the outmoded blocks that this
 * block was going to replace.
 *
 * @global moodle_database $DB
 * @param int $oldversion
 * @param object $block
 */
function xmldb_block_navigation_upgrade($oldversion, $block) {
    global $DB;
    // Implemented at 2009082800

    if ($oldversion < 2010091400) {

        $sql = "SELECT bp.id FROM {block_instances} bi
                LEFT JOIN {block_positions} bp ON bp.blockinstanceid=bi.id
                WHERE bi.blockname='navigation' AND bp.visible=0";
        $blockpositions = $DB->get_records_sql($sql);
        if ($blockpositions) {
            foreach ($blockpositions as $bp) {
                $bp->visible = 1;
                $DB->update_record('block_positions', $bp);
            }
        }

        upgrade_block_savepoint(true, 2010091400, 'navigation');
    }

    // Moodle v2.1.0 release upgrade line
    // Put any upgrade step following this

    return true;
}