<?php

class Qs_Acl extends Zend_Acl
{
    protected static $_instance;
    protected $_enabled = true;

    public function __construct($options = array())
    {
        $this->setOptions($options);
    }

    public static function getInstance()
    {
        if (null === Qs_Acl::$_instance) {
            $config = Zend_Registry::get('config');
            $options = isset($config->acl) ? $config->acl->toArray() : array();
            Qs_Acl::$_instance = new Qs_Acl($options);
        }
    }

    public function setOptions($options)
    {
        if (isset($options['options'])) {
            unset($options['options']);
        }
        if (isset($options['roles'])) {
            foreach ($options['roles'] as $role) {
                $this->addRole($role);
            }
            unset($options['roles']);
        }
        foreach ($options as $key => $value) {
            $this->setOption($key, $value);
        }
        return $this;
    }

    public function setOption($name, $value)
    {
        $method = 'set' . ucfirst($name);
        if (method_exists($this, $method)) {
            $this->$method($value);
        }
        return $this;
    }

    public function setEnabled($flag = true)
    {
        $this->_enabled = (bool) $flag;
        return $this;
    }

    public function isEnabled()
    {
        return $this->_enabled;
    }
}