<?php

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

function exp360_add_instance($exp360)
{
    global $DB;

    $exp360->timemodified = time();
    $exp360->timecreated = time();

    // Process standard intro fields.
    $exp360->introformat = FORMAT_HTML;
    $exp360->intro = '';

    return $DB->insert_record('exp360', $exp360);
}

function exp360_update_instance($exp360)
{
    global $DB;

    $exp360->timemodified = time();
    $exp360->id = $exp360->instance;

    // Process standard intro fields.
    $exp360->introformat = FORMAT_HTML;
    $exp360->intro = '';

    return $DB->update_record('exp360', $exp360);
}

function exp360_delete_instance($id)
{
    global $DB;

    if (!$exp360 = $DB->get_record('exp360', array('id' => $id))) {
        return false;
    }

    $DB->delete_records('exp360', array('id' => $exp360->id));

    return true;
}

function mod_exp360_cm_info_dynamic(cm_info $cm)
{
    global $PAGE;

    if ($cm->modname !== 'exp360') {
        return;
    }

    $renderer = $PAGE->get_renderer('mod_exp360');
    $modals = $renderer->render_modals();
    $script = $renderer->render_activity($cm->id);

    $cm->set_no_view_link();
    $cm->set_content($script . $modals);
}

/**
 * Event observer for mod_exp360.
 */
function mod_exp360_event_observer($event)
{
    global $PAGE, $DB;

    // Get the course ID from the event.
    $courseid = $event->courseid;

    // Check if the course contains any instances of the exp360 activity.
    $sql = "SELECT COUNT(*)
              FROM {course_modules} cm
              JOIN {modules} m ON cm.module = m.id
              JOIN {exp360} e ON cm.instance = e.id
             WHERE cm.course = :courseid
               AND m.name = 'exp360'";
    $params = ['courseid' => $courseid];
    $count = $DB->count_records_sql($sql, $params);

    // If the course contains at least one instance of exp360, inject the JavaScript.
    if ($count > 0) {
        $PAGE->requires->js('/mod/exp360/global.js');
    }
}

/**
 * Returns the list of event observers.
 *
 * @return array
 */
function mod_exp360_get_event_observers()
{
    return [
        [
            'eventname' => '\core\event\course_viewed',
            'callback'  => 'mod_exp360_event_observer',
        ],
    ];
}