<?php
require_once __DIR__ . '/../helpers.php';
runAuth();

try {
    $data = readJsonBody();
    $businessID = (int) ($data['BusinessID'] ?? 0);
    $servicePointID = (int) ($data['ServicePointID'] ?? 0);
    $userID = (int) ($data['UserID'] ?? 0);

    if ($businessID === 0) apiAbort(['OK' => false, 'ERROR' => 'missing_BusinessID']);

    if ($servicePointID > 0) {
        $qPresence = queryTimed("
            SELECT up.UserID, up.ServicePointID, up.LastSeenOn,
                   u.FirstName, u.LastName, u.ImageExtension,
                   sp.Name AS ServicePointName
            FROM UserPresence up
            JOIN Users u ON u.ID = up.UserID
            LEFT JOIN ServicePoints sp ON sp.ID = up.ServicePointID
            WHERE up.BusinessID = ? AND up.ServicePointID = ?
              AND up.LastSeenOn >= DATE_SUB(NOW(), INTERVAL 30 MINUTE)
              AND up.UserID != ?
            ORDER BY up.LastSeenOn DESC
        ", [$businessID, $servicePointID, $userID]);
    } else {
        $qPresence = queryTimed("
            SELECT up.UserID, up.ServicePointID, up.LastSeenOn,
                   u.FirstName, u.LastName, u.ImageExtension,
                   sp.Name AS ServicePointName
            FROM UserPresence up
            JOIN Users u ON u.ID = up.UserID
            LEFT JOIN ServicePoints sp ON sp.ID = up.ServicePointID
            WHERE up.BusinessID = ?
              AND up.LastSeenOn >= DATE_SUB(NOW(), INTERVAL 30 MINUTE)
              AND up.UserID != ?
            ORDER BY up.LastSeenOn DESC
        ", [$businessID, $userID]);
    }

    $users = [];
    foreach ($qPresence as $row) {
        $qOnTab = queryOne("
            SELECT t.ID AS TabID FROM TabMembers tm
            JOIN Tabs t ON t.ID = tm.TabID
            WHERE tm.UserID = ? AND tm.StatusID = 1 AND t.StatusID = 1 LIMIT 1
        ", [$row['UserID']]);

        $users[] = [
            'UserID' => (int) $row['UserID'],
            'FirstName' => $row['FirstName'],
            'LastName' => $row['LastName'],
            'ImageExtension' => $row['ImageExtension'] ?? '',
            'ServicePointID' => (int) ($row['ServicePointID'] ?? 0),
            'ServicePointName' => $row['ServicePointName'] ?? '',
            'LastSeenOn' => toISO8601($row['LastSeenOn']),
            'IsOnTab' => $qOnTab !== null,
        ];
    }

    jsonResponse(['OK' => true, 'USERS' => $users]);

} catch (Exception $e) {
    jsonResponse(['OK' => false, 'ERROR' => 'server_error', 'MESSAGE' => $e->getMessage()]);
}