<?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/>.

/**
 * Track Adobe Connect room occupancy for auto MP4 after the class actually ends.
 *
 * @package    mod_meetletacbmarketplace
 * @copyright  2026 MeetLet
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace mod_meetletacbmarketplace\local;

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

/**
 * Persist live/closed room state on meetlet_marketplace_meetings and decide when to sweep recordings.
 */
class roomsession {
    /** Seconds to keep looking for new recordings after the room empties. */
    public const SWEEP_GRACE = 20 * MINSECS;

    /**
     * Record occupancy. Returns true for an opportunistic queue (just closed / grace window).
     *
     * Open = at least one person in the Adobe room. Closed = it was open, then empty.
     * Moodle schedule endtime is intentionally ignored here.
     * Cron retries leftover recordings forever while the room is empty; this return
     * only gates page-view / join-status opportunistic queues during the grace window.
     */
    public static function note_presence(instance $instance, bool $islive): bool {
        global $DB;

        $map = $instance->meetingmap;
        if (!$map || empty($map->id)) {
            return false;
        }
        $row = $DB->get_record('meetlet_marketplace_meetings', ['id' => (int)$map->id]);
        if (!$row) {
            return false;
        }

        $now = time();
        $waslive = !empty($row->islive);

        if ($islive) {
            $row->islive = 1;
            $row->liveat = $now;
            $DB->update_record('meetlet_marketplace_meetings', $row);
            $instance->meetingmap = $row;
            return false;
        }

        if ($waslive) {
            $row->islive = 0;
            $row->closedat = $now;
            $row->sweepuntil = $now + self::sweep_window();
        }

        $insweep = !empty($row->sweepuntil) && $now <= (int)$row->sweepuntil;
        $due = $insweep && $instance->auto_offline_enabled()
            && ($now - (int)($row->sweptat ?? 0) >= 45);

        if ($due) {
            $row->sweptat = $now;
        }
        if ($waslive || $due) {
            $DB->update_record('meetlet_marketplace_meetings', $row);
        }
        $instance->meetingmap = $row;
        return $due;
    }

    protected static function sweep_window(): int {
        $mins = config::cron_interval_minutes();
        return max(self::SWEEP_GRACE, $mins * MINSECS * 4);
    }
}