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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/>.

namespace core_question;

use qubaid_join;
use qubaid_list;
use question_bank;
use question_engine;
use question_engine_data_mapper;

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

global $CFG;
require_once(__DIR__ . '/../lib.php');
require_once(__DIR__ . '/helpers.php');

/**
 * Unit tests for parts of {@link question_engine_data_mapper}.
 *
 * Note that many of the methods used when attempting questions, like
 * load_questions_usage_by_activity, insert_question_*, delete_steps are
 * tested elsewhere, e.g. by {@link question_usage_autosave_test}. We do not
 * re-test them here.
 *
 * @package   core_question
 * @category  test
 * @copyright 2014 The Open University
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @covers \question_engine_data_mapper
 */
class datalib_test extends \qbehaviour_walkthrough_test_base {

/**
     * We create two usages, each with two questions, a short-answer marked
     * out of 5, and and essay marked out of 10. We just start these attempts.
     *
     * Then we change the max mark for the short-answer question in one of the
     * usages to 20, using a qubaid_list, and verify.
     *
     * Then we change the max mark for the essay question in the other
     * usage to 2, using a qubaid_join, and verify.
     */
    public function test_set_max_mark_in_attempts() {

// Set up some things the tests will need.
        $this->resetAfterTest();
        $dm = new question_engine_data_mapper();

// Create the questions.
        $generator = $this->getDataGenerator()->get_plugin_generator('core_question');
        $cat = $generator->create_question_category();
        $sa = $generator->create_question('shortanswer', null,
                array('category' => $cat->id));
        $essay = $generator->create_question('essay', null,
                array('category' => $cat->id));

// Create the first usage.
        $q = question_bank::load_question($sa->id);
        $this->start_attempt_at_question($q, 'interactive', 5);

$q = question_bank::load_question($essay->id);
        $this->start_attempt_at_question($q, 'interactive', 10);

$this->finish();
        $this->save_quba();
        $usage1id = $this->quba->get_id();

// Create the second usage.
        $this->quba = question_engine::make_questions_usage_by_activity('unit_test',
                \context_system::instance());

$q = question_bank::load_question($sa->id);
        $this->start_attempt_at_question($q, 'interactive', 5);
        $this->process_submission(array('answer' => 'fish'));

$q = question_bank::load_question($essay->id);
        $this->start_attempt_at_question($q, 'interactive', 10);

$this->finish();
        $this->save_quba();
        $usage2id = $this->quba->get_id();

// Test set_max_mark_in_attempts with a qubaid_list.
        $usagestoupdate = new qubaid_list(array($usage1id));
        $dm->set_max_mark_in_attempts($usagestoupdate, 1, 20.0);
        $quba1 = question_engine::load_questions_usage_by_activity($usage1id);
        $quba2 = question_engine::load_questions_usage_by_activity($usage2id);
        $this->assertEquals(20, $quba1->get_question_max_mark(1));
        $this->assertEquals(10, $quba1->get_question_max_mark(2));
        $this->assertEquals( 5, $quba2->get_question_max_mark(1));
        $this->assertEquals(10, $quba2->get_question_max_mark(2));

// Test set_max_mark_in_attempts with a qubaid_join.
        $usagestoupdate = new qubaid_join('{question_usages} qu', 'qu.id',
                'qu.id = :usageid', array('usageid' => $usage2id));
        $dm->set_max_mark_in_attempts($usagestoupdate, 2, 2.0);
        $quba1 = question_engine::load_questions_usage_by_activity($usage1id);
        $quba2 = question_engine::load_questions_usage_by_activity($usage2id);
        $this->assertEquals(20, $quba1->get_question_max_mark(1));
        $this->assertEquals(10, $quba1->get_question_max_mark(2));
        $this->assertEquals( 5, $quba2->get_question_max_mark(1));
        $this->assertEquals( 2, $quba2->get_question_max_mark(2));

// Test the nothing to do case.
        $usagestoupdate = new qubaid_join('{question_usages} qu', 'qu.id',
                'qu.id = :usageid', array('usageid' => -1));
        $dm->set_max_mark_in_attempts($usagestoupdate, 2, 2.0);
        $quba1 = question_engine::load_questions_usage_by_activity($usage1id);
        $quba2 = question_engine::load_questions_usage_by_activity($usage2id);
        $this->assertEquals(20, $quba1->get_question_max_mark(1));
        $this->assertEquals(10, $quba1->get_question_max_mark(2));
        $this->assertEquals( 5, $quba2->get_question_max_mark(1));
        $this->assertEquals( 2, $quba2->get_question_max_mark(2));
    }

public function test_load_used_variants() {
        $this->resetAfterTest();
        $generator = $this->getDataGenerator()->get_plugin_generator('core_question');

$cat = $generator->create_question_category();
        $questiondata1 = $generator->create_question('shortanswer', null, array('category' => $cat->id));
        $questiondata2 = $generator->create_question('shortanswer', null, array('category' => $cat->id));
        $questiondata3 = $generator->create_question('shortanswer', null, array('category' => $cat->id));

$quba = question_engine::make_questions_usage_by_activity('test', \context_system::instance());
        $quba->set_preferred_behaviour('deferredfeedback');
        $question1 = question_bank::load_question($questiondata1->id);
        $question3 = question_bank::load_question($questiondata3->id);
        $quba->add_question($question1);
        $quba->add_question($question1);
        $quba->add_question($question3);
        $quba->start_all_questions();
        question_engine::save_questions_usage_by_activity($quba);

$this->assertEquals(array(
                    $questiondata1->id => array(1 => 2),
                    $questiondata2->id => array(),
                    $questiondata3->id => array(1 => 1),
                ), question_engine::load_used_variants(
                    array($questiondata1->id, $questiondata2->id, $questiondata3->id),
                    new qubaid_list(array($quba->get_id()))));
    }

public function test_repeated_usage_saving_new_usage() {
        global $DB;

$this->resetAfterTest();

$initialqurows = $DB->count_records('question_usages');
        $initialqarows = $DB->count_records('question_attempts');
        $initialqasrows = $DB->count_records('question_attempt_steps');

$generator = $this->getDataGenerator()->get_plugin_generator('core_question');
        $cat = $generator->create_question_category();
        $questiondata1 = $generator->create_question('shortanswer', null, array('category' => $cat->id));

$quba = question_engine::make_questions_usage_by_activity('test', \context_system::instance());
        $quba->set_preferred_behaviour('deferredfeedback');
        $quba->add_question(question_bank::load_question($questiondata1->id));
        $quba->start_all_questions();
        question_engine::save_questions_usage_by_activity($quba);

// Check one usage, question_attempts and step added.
        $firstid = $quba->get_id();
        $this->assertEquals(1, $DB->count_records('question_usages') - $initialqurows);
        $this->assertEquals(1, $DB->count_records('question_attempts') - $initialqarows);
        $this->assertEquals(1, $DB->count_records('question_attempt_steps') - $initialqasrows);

$quba->finish_all_questions();
        question_engine::save_questions_usage_by_activity($quba);

// Check usage id not changed.
        $this->assertEquals($firstid, $quba->get_id());

// Check still one usage, question_attempts, but now two steps.
        $this->assertEquals(1, $DB->count_records('question_usages') - $initialqurows);
        $this->assertEquals(1, $DB->count_records('question_attempts') - $initialqarows);
        $this->assertEquals(2, $DB->count_records('question_attempt_steps') - $initialqasrows);
    }

public function test_repeated_usage_saving_existing_usage() {
        global $DB;

$this->resetAfterTest();

$initquba = question_engine::make_questions_usage_by_activity('test', \context_system::instance());
        $initquba->set_preferred_behaviour('deferredfeedback');
        $slot = $initquba->add_question(question_bank::load_question($questiondata1->id));
        $initquba->start_all_questions();
        question_engine::save_questions_usage_by_activity($initquba);

$quba = question_engine::load_questions_usage_by_activity($initquba->get_id());

$initialqurows = $DB->count_records('question_usages');
        $initialqarows = $DB->count_records('question_attempts');
        $initialqasrows = $DB->count_records('question_attempt_steps');

$quba->process_all_actions(time(), $quba->prepare_simulated_post_data(
                [$slot => ['answer' => 'Frog']]));
        question_engine::save_questions_usage_by_activity($quba);

// Check one usage, question_attempts and step added.
        $this->assertEquals(0, $DB->count_records('question_usages') - $initialqurows);
        $this->assertEquals(0, $DB->count_records('question_attempts') - $initialqarows);
        $this->assertEquals(1, $DB->count_records('question_attempt_steps') - $initialqasrows);

$quba->finish_all_questions();
        question_engine::save_questions_usage_by_activity($quba);

// Check still one usage, question_attempts, but now two steps.
        $this->assertEquals(0, $DB->count_records('question_usages') - $initialqurows);
        $this->assertEquals(0, $DB->count_records('question_attempts') - $initialqarows);
        $this->assertEquals(2, $DB->count_records('question_attempt_steps') - $initialqasrows);
    }

/**
     * Test that database operations on an empty usage work without errors.
     */
    public function test_save_and_load_an_empty_usage() {
        $this->resetAfterTest();

// Create a new usage.
        $quba = question_engine::make_questions_usage_by_activity('test', \context_system::instance());
        $quba->set_preferred_behaviour('deferredfeedback');

// Save it.
        question_engine::save_questions_usage_by_activity($quba);

// Reload it.
        $reloadedquba = question_engine::load_questions_usage_by_activity($quba->get_id());
        $this->assertCount(0, $quba->get_slots());

// Delete it.
        question_engine::delete_questions_usage_by_activity($quba->get_id());
    }

public function test_cannot_save_a_step_with_a_missing_state(): void {
        global $DB;

$this->resetAfterTest();

// Create a question.
        $generator = $this->getDataGenerator()->get_plugin_generator('core_question');
        $cat = $generator->create_question_category();
        $questiondata = $generator->create_question('shortanswer', null, ['category' => $cat->id]);

// Create a usage.
        $quba = question_engine::make_questions_usage_by_activity('test', \context_system::instance());
        $quba->set_preferred_behaviour('deferredfeedback');
        $slot = $quba->add_question(question_bank::load_question($questiondata->id));
        $quba->start_all_questions();

// Add a step with a bad state.
        $newstep = new \question_attempt_step();
        $newstep->set_state(null);
        $addstepmethod = new \ReflectionMethod('question_attempt', 'add_step');
        $addstepmethod->invoke($quba->get_question_attempt($slot), $newstep);

// Verify that trying to save this throws an exception.
        $this->expectException(\dml_write_exception::class);
        question_engine::save_questions_usage_by_activity($quba);
    }

/**
     * Test cases for {@see test_get_file_area_name()}.
     *
     * @return array test cases
     */
    public function get_file_area_name_cases(): array {
        return [
            'simple variable' => ['response_attachments', 'response_attachments'],
            'behaviour variable' => ['response_5:answer', 'response_5answer'],
            'variable with special character' => ['response_5:answer', 'response_5answer'],
            'multiple underscores in different places' => ['response_weird____variable__name', 'response_weird_variable_name'],
        ];
    }

/**
     * Test get_file_area_name.
     *
     * @covers \question_file_saver::clean_file_area_name
     * @dataProvider get_file_area_name_cases
     *
     * @param string $uncleanedfilearea
     * @param string $expectedfilearea
     */
    public function test_clean_file_area_name(string $uncleanedfilearea, string $expectedfilearea): void {
        $this->assertEquals($expectedfilearea, \question_file_saver::clean_file_area_name($uncleanedfilearea));
    }
}

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