<?php

class VigiloGroups extends VigiloXml implements ArrayAccess

{

    protected $name;

    protected $groups;

    public function __construct($name)

    {

        $this->name     = $name;

        $this->groups   = array();

    }

    public function getName()

    {

        return $this->name;

    }

    public function offsetExists($offset)

    {

        $name = is_a($offset, 'VigiloGroups') ? $offset->getName() : $offset;

        return isset($this->groups[$name]);

    }

    public function offsetGet($offset)

    {

        $name = is_a($offset, 'VigiloGroups') ? $offset->getName() : $offset;

        return isset($this->groups[$name]) ? $this->groups[$name] : null;

    }

    public function offsetSet($offset, $value)

    {

        if (is_null($offset) && is_string($value)) {

            $value = new VigiloGroups($value);

        }

        if (!is_a($value, 'VigiloGroups')) {

            throw new \RuntimeException();

        }

        return $this->groups[$value->getName()] = $value;

    }

    public function offsetUnset($offset)

    {

        $name = is_a($offset, 'VigiloGroups') ? $offset->getName() : $offset;

        unset($this->groups[$name]);

    }

    public function __toString()

    {

        if (!count($this->groups)) {

            return self::sprintf(

                '<group name="%s"/>',

                $this->name

            );

        }

        return self::sprintf(

            '<group name="%s">%s</group>',

            $this->name,

            $this->groups

        );

    }

}