<?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');

// Set up the page context and other configurations
admin_externalpage_setup('report_usergrades');

/**
 * Form class for user selection
 */
class usergrades_form extends moodleform {
    public function definition() {
        $mform = $this->_form;

        // User selector
        $user_selector = new user_selector('userid', array('multiselect' => false));
        $user_selector->set_label(get_string('user'));
        $user_selector->get_view($mform);

        // Add form action buttons
        $this->add_action_buttons(false, get_string('showgrades', 'report_usergrades'));
    }
}

// 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 ($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);

        $table = new flexible_table('user-grades-report');
        $table->define_baseurl($CFG->wwwroot.'/report/usergrades/index.php');
        $table->define_columns(array('course', 'activity', 'grade'));
        $table->define_headers(array('Course', 'Activity', 'Grade'));

        $table->setup();

        foreach ($courses as $course) {
            $grade_items = grade_item::fetch_all(array('courseid' => $course->id));

            foreach ($grade_items as $item) {
                $grade = grade_grade::fetch(array('itemid' => $item->id, 'userid' => $user->id));
                $gradename = $item->get_name();
                $grade_display = $grade ? $grade->str_grade : '-';

                $table->add_data(array(format_string($course->fullname), format_string($gradename), $grade_display));
            }
        }

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

echo $OUTPUT->footer();