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<?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/>.

/**
 * Simple db search engine tests.
 *
 * @package     search_simpledb
 * @category    test
 * @copyright   2016 David Monllao {@link http://www.davidmonllao.com}
 * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

global $CFG;
require_once($CFG->dirroot . '/search/tests/fixtures/testable_core_search.php');
require_once($CFG->dirroot . '/search/tests/fixtures/mock_search_area.php');

/**
 * Simple search engine base unit tests.
 *
 * @package     search_simpledb
 * @category    test
 * @copyright   2016 David Monllao {@link http://www.davidmonllao.com}
 * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class search_simpledb_engine_testcase extends advanced_testcase {

/**
     * @var \core_search::manager
     */
    protected $search = null;

/**
     * @var \
     */
    protected $engine = null;

/**
     * @var core_search_generator
     */
    protected $generator = null;

/**
     * Initial stuff.
     *
     * @return void
     */
    public function setUp() {
        $this->resetAfterTest();

if ($this->requires_manual_index_update()) {
            // We need to update fulltext index manually, which requires an alter table statement.
            $this->preventResetByRollback();
        }

set_config('enableglobalsearch', true);

// Inject search_simpledb engine into the testable core search as we need to add the mock
        // search component to it.

$this->engine = new \search_simpledb\engine();
        $this->search = testable_core_search::instance($this->engine);
        $areaid = \core_search\manager::generate_areaid('core_mocksearch', 'mock_search_area');
        $this->search->add_search_area($areaid, new core_mocksearch\search\mock_search_area());

$this->generator = self::getDataGenerator()->get_plugin_generator('core_search');
        $this->generator->setup();

$this->setAdminUser();
    }

/**
     * tearDown
     *
     * @return void
     */
    public function tearDown() {
        // For unit tests before PHP 7, teardown is called even on skip. So only do our teardown if we did setup.
        if ($this->generator) {
            // Moodle DML freaks out if we don't teardown the temp table after each run.
            $this->generator->teardown();
            $this->generator = null;
        }
    }

/**
     * Test indexing process.
     *
     * @return void
     */
    public function test_index() {
        global $DB;

$record = new \stdClass();
        $record->timemodified = time() - 1;
        $this->generator->create_record($record);

// Data gets into the search engine.
        $this->assertTrue($this->search->index());

// Not anymore as everything was already added.
        sleep(1);
        $this->assertFalse($this->search->index());

$this->generator->create_record();

// Indexing again once there is new data.
        $this->assertTrue($this->search->index());
    }

/**
     * Test search filters.
     *
     * @return void
     */
    public function test_search() {
        global $USER, $DB;

$this->generator->create_record();
        $record = new \stdClass();
        $record->title = "Special title";
        $this->generator->create_record($record);

$this->search->index();
        $this->update_index();

$querydata = new stdClass();
        $querydata->q = 'message';
        $results = $this->search->search($querydata);
        $this->assertCount(2, $results);

// Based on core_mocksearch\search\indexer.
        $this->assertEquals($USER->id, $results[0]->get('userid'));
        $this->assertEquals(\context_course::instance(SITEID)->id, $results[0]->get('contextid'));

// Do a test to make sure we aren't searching non-query fields, like areaid.
        $querydata->q = \core_search\manager::generate_areaid('core_mocksearch', 'mock_search_area');
        $this->assertCount(0, $this->search->search($querydata));
        $querydata->q = 'message';

sleep(1);
        $beforeadding = time();
        sleep(1);
        $this->generator->create_record();
        $this->search->index();
        $this->update_index();

// Timestart.
        $querydata->timestart = $beforeadding;
        $this->assertCount(1, $this->search->search($querydata));

// Timeend.
        unset($querydata->timestart);
        $querydata->timeend = $beforeadding;
        $this->assertCount(2, $this->search->search($querydata));

// Title.
        unset($querydata->timeend);
        $querydata->title = 'Special title';
        $this->assertCount(1, $this->search->search($querydata));

// Course IDs.
        unset($querydata->title);
        $querydata->courseids = array(SITEID + 1);
        $this->assertCount(0, $this->search->search($querydata));

$querydata->courseids = array(SITEID);
        $this->assertCount(3, $this->search->search($querydata));

// Now try some area-id combinations.
        unset($querydata->courseids);
        $forumpostareaid = \core_search\manager::generate_areaid('mod_forum', 'post');
        $mockareaid = \core_search\manager::generate_areaid('core_mocksearch', 'mock_search_area');

$querydata->areaids = array($forumpostareaid);
        $this->assertCount(0, $this->search->search($querydata));

$querydata->areaids = array($forumpostareaid, $mockareaid);
        $this->assertCount(3, $this->search->search($querydata));

$querydata->areaids = array($mockareaid);
        $this->assertCount(3, $this->search->search($querydata));

$querydata->areaids = array();
        $this->assertCount(3, $this->search->search($querydata));

// Check that index contents get updated.
        $this->generator->delete_all();
        $this->search->index(true);
        $this->update_index();
        unset($querydata->title);
        $querydata->q = '';
        $this->assertCount(0, $this->search->search($querydata));
    }

/**
     * Test delete function
     *
     * @return void
     */
    public function test_delete() {

$this->generator->create_record();
        $this->generator->create_record();
        $this->search->index();
        $this->update_index();

$querydata = new stdClass();
        $querydata->q = 'message';

$this->assertCount(2, $this->search->search($querydata));

$areaid = \core_search\manager::generate_areaid('core_mocksearch', 'mock_search_area');
        $this->search->delete_index($areaid);
        $this->update_index();
        $this->assertCount(0, $this->search->search($querydata));
    }

/**
     * Test user is allowed.
     *
     * @return void
     */
    public function test_alloweduserid() {

$area = new core_mocksearch\search\mock_search_area();

$record = $this->generator->create_record();

// Get the doc and insert the default doc.
        $doc = $area->get_document($record);
        $this->engine->add_document($doc);

$users = array();
        $users[] = $this->getDataGenerator()->create_user();
        $users[] = $this->getDataGenerator()->create_user();
        $users[] = $this->getDataGenerator()->create_user();

// Add a record that only user 100 can see.
        $originalid = $doc->get('id');

// Now add a custom doc for each user.
        foreach ($users as $user) {
            $doc = $area->get_document($record);
            $doc->set('id', $originalid.'-'.$user->id);
            $doc->set('owneruserid', $user->id);
            $this->engine->add_document($doc);
        }
        $this->update_index();

$this->engine->area_index_complete($area->get_area_id());

$querydata = new stdClass();
        $querydata->q = 'message';
        $querydata->title = $doc->get('title');

// We are going to go through each user and see if they get the original and the owned doc.
        foreach ($users as $user) {
            $this->setUser($user);

$results = $this->search->search($querydata);
            $this->assertCount(2, $results);

$owned = 0;
            $notowned = 0;

// We don't know what order we will get the results in, so we are doing this.
            foreach ($results as $result) {
                $owneruserid = $result->get('owneruserid');
                if (empty($owneruserid)) {
                    $notowned++;
                    $this->assertEquals(0, $owneruserid);
                    $this->assertEquals($originalid, $result->get('id'));
                } else {
                    $owned++;
                    $this->assertEquals($user->id, $owneruserid);
                    $this->assertEquals($originalid.'-'.$user->id, $result->get('id'));
                }
            }

$this->assertEquals(1, $owned);
            $this->assertEquals(1, $notowned);
        }

// Now test a user with no owned results.
        $otheruser = $this->getDataGenerator()->create_user();
        $this->setUser($otheruser);

$results = $this->search->search($querydata);
        $this->assertCount(1, $results);

$this->assertEquals(0, $results[0]->get('owneruserid'));
        $this->assertEquals($originalid, $results[0]->get('id'));
    }

public function test_delete_by_id() {

$this->generator->create_record();
        $this->generator->create_record();
        $this->search->index();
        $this->update_index();

$querydata = new stdClass();

// Then search to make sure they are there.
        $querydata->q = 'message';
        $results = $this->search->search($querydata);
        $this->assertCount(2, $results);

$first = reset($results);
        $deleteid = $first->get('id');

$this->engine->delete_by_id($deleteid);
        $this->update_index();

// Check that we don't get a result for it anymore.
        $results = $this->search->search($querydata);
        $this->assertCount(1, $results);
        $result = reset($results);
        $this->assertNotEquals($deleteid, $result->get('id'));
    }

/**
     * Updates mssql fulltext index if necessary.
     *
     * @return bool
     */
    private function update_index() {
        global $DB;

if (!$this->requires_manual_index_update()) {
            return;
        }

$DB->execute("ALTER FULLTEXT INDEX ON {search_simpledb_index} START UPDATE POPULATION");

$catalogname = $DB->get_prefix() . 'search_simpledb_catalog';
        $retries = 0;
        do {
            // 0.2 seconds.
            usleep(200000);

$record = $DB->get_record_sql("SELECT FULLTEXTCATALOGPROPERTY(cat.name, 'PopulateStatus') AS [PopulateStatus]
                                             FROM sys.fulltext_catalogs AS cat
                                            WHERE cat.name = ?", array($catalogname));
            $retries++;

} while ($retries < 100 && $record->populatestatus != '0');

if ($retries === 100) {
            // No update after 20 seconds...
            $this->fail('Sorry, your SQL server fulltext search index is too slow.');
        }
    }

/**
     * Mssql with fulltext support requires manual updates.
     *
     * @return bool
     */
    private function requires_manual_index_update() {
        global $DB;
        return ($DB->get_dbfamily() === 'mssql' && $DB->is_fulltext_search_supported());
    }
}