<?php

class Permissions {
    const VIEW_CHANNEL = 1;
    const SEND_MESSAGES = 2;
    const MANAGE_MESSAGES = 4;
    const MANAGE_CHANNELS = 8;
    const MANAGE_SERVER = 16;
    const ADMINISTRATOR = 32;

    public static function hasPermission($user_id, $server_id, $permission) {
        $stmt = db()->prepare("
            SELECT SUM(r.permissions) as total_perms 
            FROM roles r
            JOIN user_roles ur ON r.id = ur.role_id
            WHERE ur.user_id = ? AND r.server_id = ?
        ");
        $stmt->execute([$user_id, $server_id]);
        $row = $stmt->fetch();
        $perms = (int)($row['total_perms'] ?? 0);

        if ($perms & self::ADMINISTRATOR) return true;
        return ($perms & $permission) === $permission;
    }
}