<?php
require_once('../../config.php');
require_once($CFG->libdir . '/adminlib.php');
require_once($CFG->libdir . '/gradelib.php');
require_once($CFG->libdir . '/tablelib.php');
require_once($CFG->libdir . '/formslib.php');
require_once($CFG->dirroot . '/user/selector/lib.php');
require_once('classes/user_selector.php');
require_once('classes/usergrades_form.php');

// Set up the page context and other configurations
admin_externalpage_setup('report_usergrades_details', '', null, '', array('capability' => 'report/usergrades:view'));

// Instantiate the form
$mform = new usergrades_form();
echo $OUTPUT->header();
echo $OUTPUT->heading(get_string('usergradesreport', 'report_usergrades'));

// Form processing and displaying is done here
if ($mform->is_cancelled()) {
    // Handle form cancellation, if necessary
    redirect(new moodle_url('/admin/report.php'));
} else if ($data = $mform->get_data()) {
    $userid = $data->userid;

    // Fetch and display user grades if a user is selected
    if (!empty($userid)) {
        $user = $DB->get_record('user', array('id' => $userid), '*', MUST_EXIST);
        $courses = enrol_get_users_courses($user->id, true);
        $questions = $DB->get_records('question');

        foreach ($courses as $course) {
            // Basic information about the course
            echo $OUTPUT->heading($course->fullname, 3);

            // Fetch all quizzes in the course
            $quizzes = $DB->get_records('quiz', array('course' => $course->id));

            if ($quizzes) {
                echo $OUTPUT->heading(get_string('quizzes', 'report_usergrades'), 4);

                foreach ($quizzes as $quiz) {
                    // Fetch the quiz questions
                    $quiz_questions = $DB->get_records('quiz_slots', array('quizid' => $quiz->id));

                    // Fetch the quiz attempts
                    $quiz_attempts = $DB->get_records('quiz_attempts', array('quiz' => $quiz->id, 'userid' => $user->id));

                    if ($quiz_attempts) {
                        echo $OUTPUT->heading($quiz->name, 5);

                        foreach ($quiz_attempts as $attempt) {
                            echo $OUTPUT->heading(get_string('attempt', 'report_usergrades') . ' ' . $attempt->attempt, 6);

                            $attempt_table = new html_table();
                            $attempt_table->head = array(get_string('question', 'report_usergrades'), get_string('response', 'report_usergrades'), get_string('grade', 'report_usergrades'));

                            $question_usages = $DB->get_records('question_usages', array('id' => $attempt->uniqueid));
                            
                            foreach ($question_usages as $question_usage) {
                                $question_attempts = $DB->get_records('question_attempts', array('questionusageid' => $question_usage->id));

                                foreach ($question_attempts as $question_attempt) {
                                    $question = $questions[$question_attempt->questionid];
                                    $response = $question_attempt->responsesummary;

                                    $question_grade = $DB->get_record('question_attempt_steps', array('questionattemptid' => $question_attempt->id));

                                    $attempt_table->data[] = array($question->name, $response, $question_grade->fraction);
                                }
                            }

                            echo html_writer::table($attempt_table);

                            $total_grade = $DB->get_record('quiz_grades', array('quiz' => $quiz->id, 'userid' => $user->id));

                            echo $OUTPUT->heading(get_string('totalgrade', 'report_usergrades') . ': ' . $total_grade->grade . ' / ' . $quiz->grade, 6);

                        }
                    }
                }
            }
        }
    } else {
        echo $OUTPUT->notification(get_string('nouserselected', 'report_usergrades'), 'notifyproblem');
    }
} else {
    // Display form if no data is submitted
    $mform->display();
}

echo $OUTPUT->footer();