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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/>.

/**
 * Unit tests for grade/import/lib.php.
 *
 * @package   core_grades
 * @category  phpunit
 * @copyright 2015 Adrian Greeve <adrian@moodle.com>
 * @license   http://www.gnu.org/copyleft/gpl.html GNU Public License
 */

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

global $CFG;
require_once($CFG->dirroot . '/grade/import/lib.php');

/**
 * Tests grade_import_lib functions.
 */
class core_grade_import_lib_test extends advanced_testcase {

/**
     * Import grades into 'grade_import_values' table. This is done differently in the various import plugins,
     * so there is no direct API to call.
     *
     * @param array $data Information to be inserted into the table.
     * @return int The insert ID of the sql statement.
     */
    private function import_grades($data) {
        global $DB, $USER;
        $graderecord = new stdClass();
        $graderecord->importcode = $data['importcode'];
        if (isset($data['itemid'])) {
            $graderecord->itemid = $data['itemid'];
        }
        $graderecord->userid = $data['userid'];
        if (isset($data['importer'])) {
            $graderecord->importer = $data['importer'];
        } else {
            $graderecord->importer = $USER->id;
        }
        if (isset($data['finalgrade'])) {
            $graderecord->finalgrade = $data['finalgrade'];
        } else {
            $graderecord->finalgrade = rand(0, 100);
        }
        if (isset($data['feedback'])) {
            $graderecord->feedback = $data['feedback'];
        }
        if (isset($data['importonlyfeedback'])) {
            $graderecord->importonlyfeedback = $data['importonlyfeedback'];
        } else {
            $graderecord->importonlyfeedback = false;
        }
        if (isset($data['newgradeitem'])) {
            $graderecord->newgradeitem = $data['newgradeitem'];
        }
        return $DB->insert_record('grade_import_values', $graderecord);
    }

/**
     * Tests for importing grades from an external source.
     */
    public function test_grade_import_commit() {
        global $USER, $DB, $CFG;
        $this->resetAfterTest();

$importcode = get_new_importcode();
        $user1 = $this->getDataGenerator()->create_user();
        $user2 = $this->getDataGenerator()->create_user();

$course = $this->getDataGenerator()->create_course();
        $assign = $this->getDataGenerator()->create_module('assign', array('course' => $course->id));
        $itemname = $assign->name;
        $modulecontext = context_module::instance($assign->cmid);
        // The generator returns a dummy object, lets get the real assign object.
        $assign = new assign($modulecontext, false, false);
        $cm = $assign->get_course_module();

// Enrol users in the course.
        $this->getDataGenerator()->enrol_user($user1->id, $course->id);
        $this->getDataGenerator()->enrol_user($user2->id, $course->id);

// Enter a new grade into an existing grade item.
        $gradeitem = grade_item::fetch(array('courseid' => $course->id, 'itemtype' => 'mod'));

// Keep this value around for a test further down.
        $originalgrade = 55;
        $this->import_grades(array(
            'importcode' => $importcode,
            'itemid' => $gradeitem->id,
            'userid' => $user1->id,
            'finalgrade' => $originalgrade
        ));

$status = grade_import_commit($course->id, $importcode, false, false);
        $this->assertTrue($status);

// Get imported grade_grade.
        $gradegrade = grade_grade::fetch(array('itemid' => $gradeitem->id, 'userid' => $user1->id));
        $this->assertEquals($originalgrade, $gradegrade->finalgrade);
        // Overriden field will be a timestamp and will evaluate out to true.
        $this->assertTrue($gradegrade->is_overridden());

// Create a new grade item and import into that.
        $importcode = get_new_importcode();
        $record = new stdClass();
        $record->itemname = 'New grade item';
        $record->importcode = $importcode;
        $record->importer = $USER->id;
        $insertid = $DB->insert_record('grade_import_newitem', $record);

$finalgrade = 75;
        $this->import_grades(array(
            'importcode' => $importcode,
            'userid' => $user1->id,
            'finalgrade' => $finalgrade,
            'newgradeitem' => $insertid
        ));

$status = grade_import_commit($course->id, $importcode, false, false);
        $this->assertTrue($status);
        // Check that we have a new grade_item.
        $gradeitem = grade_item::fetch(array('courseid' => $course->id, 'itemtype' => 'manual'));
        $this->assertEquals($record->itemname, $gradeitem->itemname);
        // Grades were imported.
        $gradegrade = grade_grade::fetch(array('itemid' => $gradeitem->id, 'userid' => $user1->id));
        $this->assertEquals($finalgrade, $gradegrade->finalgrade);
        // As this is a new item the grade has not been overridden.
        $this->assertFalse($gradegrade->is_overridden());

// Import feedback only.
        $importcode = get_new_importcode();
        $gradeitem = grade_item::fetch(array('courseid' => $course->id, 'itemtype' => 'mod'));

$originalfeedback = 'feedback can be useful';
        $this->import_grades(array(
            'importcode' => $importcode,
            'userid' => $user1->id,
            'itemid' => $gradeitem->id,
            'feedback' => $originalfeedback,
            'importonlyfeedback' => true
        ));

$status = grade_import_commit($course->id, $importcode, true, false);
        $this->assertTrue($status);
        $gradegrade = grade_grade::fetch(array('itemid' => $gradeitem->id, 'userid' => $user1->id));
        // The final grade should be the same as the first record further up. We are only altering the feedback.
        $this->assertEquals($originalgrade, $gradegrade->finalgrade);
        $this->assertTrue($gradegrade->is_overridden());

// Import grades only.
        $importcode = get_new_importcode();
        $gradeitem = grade_item::fetch(array('courseid' => $course->id, 'itemtype' => 'mod'));

$finalgrade = 60;
        $this->import_grades(array(
            'importcode' => $importcode,
            'userid' => $user1->id,
            'itemid' => $gradeitem->id,
            'finalgrade' => $finalgrade,
            'feedback' => 'feedback can still be useful'
        ));

$status = grade_import_commit($course->id, $importcode, false, false);
        $this->assertTrue($status);
        $gradegrade = grade_grade::fetch(array('itemid' => $gradeitem->id, 'userid' => $user1->id));
        $this->assertEquals($finalgrade, $gradegrade->finalgrade);
        // The final feedback should not have changed.
        $this->assertEquals($originalfeedback, $gradegrade->feedback);
        $this->assertTrue($gradegrade->is_overridden());

// Check that printing of import status is correct.
        $importcode = get_new_importcode();
        $gradeitem = grade_item::fetch(array('courseid' => $course->id, 'itemtype' => 'mod'));

$this->import_grades(array(
            'importcode' => $importcode,
            'userid' => $user1->id,
            'itemid' => $gradeitem->id
        ));

ob_start();
        $status = grade_import_commit($course->id, $importcode);
        $output = ob_get_contents();
        ob_end_clean();
        $this->assertTrue($status);
        $this->assertContains("++ Grade import success ++", $output);
    }
}