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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.
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// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Unit tests for the multianswer question definition class.
 *
 * @package    qtype
 * @subpackage multianswer
 * @copyright  2011 The Open University
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

global $CFG;
require_once($CFG->dirroot . '/question/engine/tests/helpers.php');

/**
 * Unit tests for qtype_multianswer_question.
 *
 * @copyright  2011 The Open University
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class qtype_multianswer_question_test extends advanced_testcase {
    public function test_get_expected_data() {
        $question = test_question_maker::make_question('multianswer');
        $this->assertEquals(array('sub1_answer' => PARAM_RAW_TRIMMED,
                'sub2_answer' => PARAM_RAW), $question->get_expected_data());
    }

public function test_is_complete_response() {
        $question = test_question_maker::make_question('multianswer');

$this->assertFalse($question->is_complete_response(array()));
        $this->assertTrue($question->is_complete_response(array('sub1_answer' => 'Owl',
                'sub2_answer' => '2')));
        $this->assertTrue($question->is_complete_response(array('sub1_answer' => '0',
                'sub2_answer' => 0)));
        $this->assertFalse($question->is_complete_response(array('sub1_answer' => 'Owl')));
    }

public function test_is_gradable_response() {
        $question = test_question_maker::make_question('multianswer');

$this->assertFalse($question->is_gradable_response(array()));
        $this->assertTrue($question->is_gradable_response(array('sub1_answer' => 'Owl',
                'sub2_answer' => '2')));
        $this->assertTrue($question->is_gradable_response(array('sub1_answer' => '0',
                'sub2_answer' => 0)));
        $this->assertTrue($question->is_gradable_response(array('sub1_answer' => 'Owl')));
    }

public function test_grading() {
        $question = test_question_maker::make_question('multianswer');
        $question->start_attempt(new question_attempt_step(), 1);

$rightchoice = $question->subquestions[2]->get_correct_response();

$this->assertEquals(array(1, question_state::$gradedright), $question->grade_response(
                array('sub1_answer' => 'Owl', 'sub2_answer' => reset($rightchoice))));
        $this->assertEquals(array(0.5, question_state::$gradedpartial), $question->grade_response(
                array('sub1_answer' => 'Owl')));
        $this->assertEquals(array(0.5, question_state::$gradedpartial), $question->grade_response(
                array('sub1_answer' => 'Goat', 'sub2_answer' => reset($rightchoice))));
        $this->assertEquals(array(0, question_state::$gradedwrong), $question->grade_response(
                array('sub1_answer' => 'Dog')));
    }

public function test_get_correct_response() {
        $question = test_question_maker::make_question('multianswer');
        $question->start_attempt(new question_attempt_step(), 1);

$rightchoice = $question->subquestions[2]->get_correct_response();

$this->assertEquals(array('sub1_answer' => 'Owl', 'sub2_answer' => reset($rightchoice)),
                $question->get_correct_response());
    }

public function test_get_question_summary() {
        $question = test_question_maker::make_question('multianswer');

// Bit of a hack to make testing easier.
        $question->subquestions[2]->shuffleanswers = false;

$question->start_attempt(new question_attempt_step(), 1);

$qsummary = $question->get_question_summary();
        $this->assertEquals('Complete this opening line of verse: "The _____ and the ' .
                '{Bow-wow; Wiggly worm; Pussy-cat} went to sea".', $qsummary);
    }

public function test_summarise_response() {
        $question = test_question_maker::make_question('multianswer');
        $question->start_attempt(new question_attempt_step(), 1);

$rightchoice = $question->subquestions[2]->get_correct_response();

$this->assertEquals(get_string('subqresponse', 'qtype_multianswer',
                array('i' => 1, 'response' => 'Owl')) . '; ' .
                get_string('subqresponse', 'qtype_multianswer',
                array('i' => 2, 'response' => 'Pussy-cat')), $question->summarise_response(
                array('sub1_answer' => 'Owl', 'sub2_answer' => reset($rightchoice))));
    }

public function test_get_num_parts_right() {
        $question = test_question_maker::make_question('multianswer');
        $question->start_attempt(new question_attempt_step(), 1);

$rightchoice = $question->subquestions[2]->get_correct_response();
        $right = reset($rightchoice);

$response = array('sub1_answer' => 'Frog', 'sub2_answer' => $right);
        list($numpartsright, $numparts) = $question->get_num_parts_right($response);
        $this->assertEquals(1, $numpartsright);
        $this->assertEquals(2, $numparts);
        $response = array('sub1_answer' => 'Owl', 'sub2_answer' => $right);
        list($numpartsright, $numparts) = $question->get_num_parts_right($response);
        $this->assertEquals(2, $numpartsright);
        $response = array('sub1_answer' => 'Dog', 'sub2_answer' => 3);
        list($numpartsright, $numparts) = $question->get_num_parts_right($response);
        $this->assertEquals(0, $numpartsright);
        $response = array('sub1_answer' => 'Owl');
        list($numpartsright, $numparts) = $question->get_num_parts_right($response);
        $this->assertEquals(1, $numpartsright);
        $response = array('sub1_answer' => 'Dog');
        list($numpartsright, $numparts) = $question->get_num_parts_right($response);
        $this->assertEquals(0, $numpartsright);
        $response = array('sub2_answer' => $right);
        list($numpartsright, $numparts) = $question->get_num_parts_right($response);
        $this->assertEquals(1, $numpartsright);
    }

public function test_get_num_parts_right_fourmc() {
        // Create a multianswer question with four mcq.
        $question = test_question_maker::make_question('multianswer', 'fourmc');
        $question->start_attempt(new question_attempt_step(), 1);

$response = array('sub1_answer' => '1', 'sub2_answer' => '1',
                'sub3_answer' => '1', 'sub4_answer' => '1');
        list($numpartsright, $numparts) = $question->get_num_parts_right($response);
        $this->assertEquals(2, $numpartsright);
    }

public function test_clear_wrong_from_response() {
        $question = test_question_maker::make_question('multianswer');
        $question->start_attempt(new question_attempt_step(), 1);

$rightchoice = $question->subquestions[2]->get_correct_response();
        $right = reset($rightchoice);

$response = array('sub1_answer' => 'Frog', 'sub2_answer' => $right);
        $this->assertEquals($question->clear_wrong_from_response($response),
                array('sub1_answer' => '', 'sub2_answer' => $right));
        $response = array('sub1_answer' => 'Owl', 'sub2_answer' => $right);
        $this->assertEquals($question->clear_wrong_from_response($response),
                array('sub1_answer' => 'Owl', 'sub2_answer' => $right));
        $response = array('sub1_answer' => 'Dog', 'sub2_answer' => 3);
        $this->assertEquals($question->clear_wrong_from_response($response),
                array('sub1_answer' => '', 'sub2_answer' => ''));
        $response = array('sub1_answer' => 'Owl');
        $this->assertEquals($question->clear_wrong_from_response($response),
                array('sub1_answer' => 'Owl'));
        $response = array('sub2_answer' => $right);
        $this->assertEquals($question->clear_wrong_from_response($response),
                array('sub2_answer' => $right));
    }

public function test_compute_final_grade() {
        $question = test_question_maker::make_question('multianswer');
        // Set penalty to 0.2 to ease calculations.
        $question->penalty = 0.2;
        // Set subquestion 2 defaultmark to 2, to make it a better test,
        // even thought (at the moment) that never happens for real.
        $question->subquestions[2]->defaultmark = 2;

$question->start_attempt(new question_attempt_step(), 1);

// Compute right and wrong response for subquestion 2.
        $rightchoice = $question->subquestions[2]->get_correct_response();
        $right = reset($rightchoice);
        $wrong = ($right + 1) % 3;

// Get subquestion 1 right at 2nd try and subquestion 2 right at 3rd try.
        $responses = array(0 => array('sub1_answer' => 'Dog', 'sub2_answer' => $wrong),
                           1 => array('sub1_answer' => 'Owl', 'sub2_answer' => $wrong),
                           2 => array('sub1_answer' => 'Owl', 'sub2_answer' => $right),
                          );
        $finalgrade = $question->compute_final_grade($responses, 1);
        $this->assertEquals(1 / 3 * (1 - 0.2) + 2 / 3 * (1 - 2 * 0.2), $finalgrade);

// Get subquestion 1 right at 3rd try and subquestion 2 right at 2nd try.
        $responses = array(0 => array('sub1_answer' => 'Dog', 'sub2_answer' => $wrong),
                           1 => array('sub1_answer' => 'Cat', 'sub2_answer' => $right),
                           2 => array('sub1_answer' => 'Owl', 'sub2_answer' => $right),
                           3 => array('sub1_answer' => 'Owl', 'sub2_answer' => $right),
                          );
        $finalgrade = $question->compute_final_grade($responses, 1);
        $this->assertEquals(1 / 3 * (1 - 2 * 0.2) + 2 / 3 * (1 - 0.2), $finalgrade);

// Get subquestion 1 right at 4th try and subquestion 2 right at 1st try.
        $responses = array(0 => array('sub1_answer' => 'Dog', 'sub2_answer' => $right),
                           1 => array('sub1_answer' => 'Dog', 'sub2_answer' => $right),
                           2 => array('sub1_answer' => 'Dog', 'sub2_answer' => $right),
                           3 => array('sub1_answer' => 'Owl', 'sub2_answer' => $right),
                          );
        $finalgrade = $question->compute_final_grade($responses, 1);
        $this->assertEquals(1 / 3 * (1 - 3 * 0.2) + 2 / 3, $finalgrade);

// Get subquestion 1 right at 4th try and subquestion 2 right 3rd try.
        // Subquestion 2 was right at 1st try, but last change is at 3rd try.
        $responses = array(0 => array('sub1_answer' => 'Dog', 'sub2_answer' => $right),
                           1 => array('sub1_answer' => 'Cat', 'sub2_answer' => $wrong),
                           2 => array('sub1_answer' => 'Frog', 'sub2_answer' => $right),
                           3 => array('sub1_answer' => 'Owl', 'sub2_answer' => $right),
                          );
        $finalgrade = $question->compute_final_grade($responses, 1);
        $this->assertEquals(1 / 3 * (1 - 3 * 0.2) + 2 / 3 * (1 - 2 * 0.2), $finalgrade);

// Incomplete responses. Subquestion 1 is right at 4th try and subquestion 2 at 3rd try.
        $responses = array(0 => array('sub1_answer' => 'Dog'),
                           1 => array('sub1_answer' => 'Cat'),
                           2 => array('sub1_answer' => 'Frog', 'sub2_answer' => $right),
                           3 => array('sub1_answer' => 'Owl', 'sub2_answer' => $right),
                          );
        $finalgrade = $question->compute_final_grade($responses, 1);
        $this->assertEquals(1 / 3 * (1 - 3 * 0.2) + 2 / 3 * (1 - 2 * 0.2), $finalgrade);
    }
}