class Route private segment1 private segment2 private segment3 private

class Route {

    private $segment1;
    private $segment2;
    private $segment3;

    private $controller_path;
    private $controller;
    private $action;

    private $notfound = false;

    public function getRoute($route) {
        $query = substr($route, 1);
        $ex = explode('?', $query);
        $query = $ex[0];

        $rules = '';
        $rules_dir = DATA_PATH.'/rules';

        $dir = opendir($rules_dir);
        while($f = readdir($dir)) {
            if (strstr($f, '.rules'))
                $rules .= trim(file_get_contents($rules_dir .'/'. $f)) . PHP_EOL;
        }

        $rules .= '([a-z0-9_\-]*)([\.a-z0-9]*)#segment1=$1'. PHP_EOL;
        $rules .= '([a-z0-9_\-]*)/([a-z0-9_\-]*)([\.a-z0-9]*)#segment1=$1&segment2=$2'. PHP_EOL;
        $rules .= '([a-z0-9_\-]*)/([a-z0-9_\-]*)/([a-z0-9_\-]*)([\.a-z0-9]*)#segment1=$1&segment2=$2&segment3=$3'. PHP_EOL;

        $rules = explode("\n", $rules);

        foreach($rules as $rule) {
            $rule = trim($rule);
            if (strpos($rule, '#') == 0 or $rule == '')
                continue;
            $ex = explode('#', $rule);
            if (preg_match('~^'. $ex[0] .'$~', $query)) {
                $result = preg_replace('~^'. $ex[0] .'$~', $ex[1], $query, 1);
                $vars = explode('&', $result);
                foreach($vars as $var) {
                    $_ex = explode('=', $var);
                    $_GET[$_ex[0]] = $_ex[1];
                }
                break;
            }
        }
    }

    public function startRoute() {
        if ($this->check_segments()) {
            // если нет сегментов
            if (empty($this->segment1)) {
                $file = CONTROLLER_PATH . '/' . DEFAULT_CONTROLLER . '.php';
                if (file_exists($file)) {
                    $this->controller_path = $file;
                    $this->controller = DEFAULT_CONTROLLER;
                    $this->action = DEFAULT_ACTION;
                } else
                    $this->notfound = true;
            }

            // если указаны все 3 сегмента
            if (! empty($this->segment1) && ! empty($this->segment2) && ! empty($this->segment3)) {
                $file = CONTROLLER_PATH . '/' . $this->segment1 .'_' . $this->segment2 . '.php';
                if (file_exists($file)) {
                    $this->controller_path = $file;
                    $this->controller = $this->segment1 . '_' . $this->segment2;
                    $this->action = $this->segment3;
                } else
                    $this->notfound = true;
                // если указаны 2 сегмента
            } elseif (! empty($this->segment1) && ! empty($this->segment2)) {
                $file = CONTROLLER_PATH . '/' . $this->segment1 .'_' . $this->segment2 . '.php';
                $file_one = CONTROLLER_PATH . '/' . $this->segment1 . '.php';
                if (file_exists($file)) {
                    $this->controller_path = $file;
                    $this->controller = $this->segment1 . '_' . $this->segment2;
                    $this->action = null;
                } elseif (file_exists($file_one)) {
                    $this->controller_path = $file_one;
                    $this->controller = $this->segment1;
                    $this->action = $this->segment2;
                } else
                    $this->notfound = true;
                // если указан только 1 сегмент
            } elseif (! empty($this->segment1)) {
                $file = CONTROLLER_PATH . '/' . $this->segment1 . '.php';
                if (file_exists($file)) {
                    $this->controller_path = $file;
                    $this->controller = $this->segment1;
                    $this->action = null;
                } else
                    $this->notfound = true;
            }

            $this->runRoute();
        }
    }

    public function runRoute() {

        if ($this->notfound) {

            $class = DEFAULT_CONTROLLER;
            $action = 'notfound';

            $this->controller_path = CONTROLLER_PATH . '/' . $class . '.php';
        } else {
            $class = $this->controller;
            $action = $this->action;
        }

        if (! $action)
            $action = DEFAULT_ACTION;

        require $this->controller_path;

        if (! class_exists($class)) {
            $class = DEFAULT_CONTROLLER;
            $action = 'notfound';
        }

        $controller = new $class;

        if (! method_exists($controller, $action)) {

            if ($class != DEFAULT_CONTROLLER) {
                $class = DEFAULT_CONTROLLER;
                require CONTROLLER . '/' . $class . '.php';
                $controller = new $class;
            }

            $action = 'notfound';
        }

        $controller->$action();
    }

    protected function check_segments() {
        $check_segments = true;

        if (! empty($_GET['segment1'])) {
            if (preg_match('~^[0-9a-z_-]*$~', $_GET['segment1']))
                $this->segment1 = $_GET['segment1'];
            else
                $check_segments = false;
        }

        if (! empty($_GET['segment2'])) {
            if (preg_match('~^[0-9a-z_-]*$~', $_GET['segment2']))
                $this->segment2 = $_GET['segment2'];
            else
                $check_segments = false;
        }

        if (! empty($_GET['segment3'])) {
            if (preg_match('~^[0-9a-z_-]*$~', $_GET['segment3']))
                $this->segment3 = $_GET['segment3'];
            else
                $check_segments = false;
        }

        if (! $check_segments)
            exit('Ошибка регистрации сегментов!');

        return true;
    }
}