private function get_game_rating(&$data) : int
    {
        $rating = $this->rating;
        $prestige = $this->prestige;

        $kills = $data['kills'];
        $deaths = $data['deaths'];
        $assists = $data['assists'];

        $win_state = $data['win_state'];
        $connection_state = $data['connection_state'];

        $gpm = $data['gold_per_min'];
        $stuns = $data['stuns'];
        $total_heal = $data['hero_healing'];
        $tower_damage = $data['tower_damage'];
        $total_damage_done_to_heroes = $data['hero_damage'];
        $deni = $data['denies'];
        $total_damage_taken_from_heroes = $data['total_damage_taken_from_heroes'];
        $last_hits = $data['last_hits'];
        $level = $data['level'];
        $total_gold = $data['gold'];
        $exp_per_min = $data['xp_per_minute'];
        $game_time = $data['time'];

        ///formula
    }