<?php

/*
 * © 2016 IRSTEA
 * Guillaume Perréal <guillaume.perreal@irstea.fr>
 * Tous droits réservés.
 */

namespace Irstea\PlantUmlBundle\Model\Namespace_;

use Irstea\PlantUmlBundle\Model\NamespaceInterface;
use Irstea\PlantUmlBundle\Model\NodeInterface;
use Irstea\PlantUmlBundle\Writer\WritableInterface;
use Irstea\PlantUmlBundle\Writer\WriterInterface;

/**
 * Description of Namespace
 *
 * @author Guillaume Perréal <guillaume.perreal@irstea.fr>
 */
abstract class AbstractHierachicalNamespace extends AbstractNamespace
{
    /**
     * @var NamespaceInterface
     */
    private $children = [];

    /**
     * @param type $namespaceName
     * @return NamespaceInterface
     */
    public function getNamespace($namespaceName)
    {
        $namespaceName = trim($namespaceName, '\\');
        if (!$namespaceName) {
            return $this;
        }
        @list($head, $tail) = explode('\\', $namespaceName, 2);
        if (!isset($this->children[$head])) {
            $this->children[$head] = new Namespace_($this, $head);
        }
        if (empty($tail)) {
            return $this->children[$head];
        }
        return $this->children[$head]->getNamespace($tail);
    }

    /**
     * @return $string
     */
    abstract protected function getNamespacePrefix();

    public function getShortName($name)
    {
        $prefix = $this->getNamespacePrefix();
        if (0 === strpos($name, $prefix)) {
            return substr($name, strlen($prefix));
        }
        return $name;
    }

    /**
     * @param WriterInterface $writer
     * @return self
     */
    protected function outputChildrenTo(WriterInterface $writer)
    {
        foreach ($this->children as $child) {
            $child->outputTo($writer);
        }
        return $this;
    }

    /**
     * @return bool
     */
    protected function isEmpty()
    {
        return parent::isEmpty() && empty($this->children);
    }
}