<?php
/**
 * Zend Framework (http://framework.zend.com/)
 *
 * @link      http://github.com/zendframework/zf2 for the canonical source repository
 * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
 * @license   http://framework.zend.com/license/new-bsd New BSD License
 */

namespace Zend\Feed\Writer\Extension\ITunes\Renderer;

use DOMDocument;
use DOMElement;
use Zend\Feed\Writer\Extension;

/**
*/
class Entry extends Extension\AbstractRenderer
{
    /**
     * Set to TRUE if a rendering method actually renders something. This
     * is used to prevent premature appending of a XML namespace declaration
     * until an element which requires it is actually appended.
     *
     * @var bool
     */
    protected $called = false;

    /**
     * Render entry
     *
     * @return void
     */
    public function render()
    {
        $this->_setAuthors($this->dom, $this->base);
        $this->_setBlock($this->dom, $this->base);
        $this->_setDuration($this->dom, $this->base);
        $this->_setExplicit($this->dom, $this->base);
        $this->_setKeywords($this->dom, $this->base);
        $this->_setSubtitle($this->dom, $this->base);
        $this->_setSummary($this->dom, $this->base);
        if ($this->called) {
            $this->_appendNamespaces();
        }
    }

    /**
     * Append namespaces to entry root
     *
     * @return void
     */
    protected function _appendNamespaces()
    {
        $this->getRootElement()->setAttribute('xmlns:itunes',
            'http://www.itunes.com/dtds/podcast-1.0.dtd');
    }

    /**
     * Set entry authors
     *
     * @param  DOMDocument $dom
     * @param  DOMElement $root
     * @return void
     */
    protected function _setAuthors(DOMDocument $dom, DOMElement $root)
    {
        $authors = $this->getDataContainer()->getItunesAuthors();
        if (!$authors || empty($authors)) {
            return;
        }
        foreach ($authors as $author) {
            $el = $dom->createElement('itunes:author');
            $text = $dom->createTextNode($author);
            $el->appendChild($text);
            $root->appendChild($el);
            $this->called = true;
        }
    }

    /**
     * Set itunes block
     *
     * @param  DOMDocument $dom
     * @param  DOMElement $root
     * @return void
     */
    protected function _setBlock(DOMDocument $dom, DOMElement $root)
    {
        $block = $this->getDataContainer()->getItunesBlock();
        if ($block === null) {
            return;
        }
        $el = $dom->createElement('itunes:block');
        $text = $dom->createTextNode($block);
        $el->appendChild($text);
        $root->appendChild($el);
        $this->called = true;
    }

    /**
     * Set entry duration
     *
     * @param  DOMDocument $dom
     * @param  DOMElement $root
     * @return void
     */
    protected function _setDuration(DOMDocument $dom, DOMElement $root)
    {
        $duration = $this->getDataContainer()->getItunesDuration();
        if (!$duration) {
            return;
        }
        $el = $dom->createElement('itunes:duration');
        $text = $dom->createTextNode($duration);
        $el->appendChild($text);
        $root->appendChild($el);
        $this->called = true;
    }

    /**
     * Set explicit flag
     *
     * @param  DOMDocument $dom
     * @param  DOMElement $root
     * @return void
     */
    protected function _setExplicit(DOMDocument $dom, DOMElement $root)
    {
        $explicit = $this->getDataContainer()->getItunesExplicit();
        if ($explicit === null) {
            return;
        }
        $el = $dom->createElement('itunes:explicit');
        $text = $dom->createTextNode($explicit);
        $el->appendChild($text);
        $root->appendChild($el);
        $this->called = true;
    }

    /**
     * Set entry keywords
     *
     * @param  DOMDocument $dom
     * @param  DOMElement $root
     * @return void
     */
    protected function _setKeywords(DOMDocument $dom, DOMElement $root)
    {
        $keywords = $this->getDataContainer()->getItunesKeywords();
        if (!$keywords || empty($keywords)) {
            return;
        }
        $el = $dom->createElement('itunes:keywords');
        $text = $dom->createTextNode(implode(',', $keywords));
        $el->appendChild($text);
        $root->appendChild($el);
        $this->called = true;
    }

    /**
     * Set entry subtitle
     *
     * @param  DOMDocument $dom
     * @param  DOMElement $root
     * @return void
     */
    protected function _setSubtitle(DOMDocument $dom, DOMElement $root)
    {
        $subtitle = $this->getDataContainer()->getItunesSubtitle();
        if (!$subtitle) {
            return;
        }
        $el = $dom->createElement('itunes:subtitle');
        $text = $dom->createTextNode($subtitle);
        $el->appendChild($text);
        $root->appendChild($el);
        $this->called = true;
    }

    /**
     * Set entry summary
     *
     * @param  DOMDocument $dom
     * @param  DOMElement $root
     * @return void
     */
    protected function _setSummary(DOMDocument $dom, DOMElement $root)
    {
        $summary = $this->getDataContainer()->getItunesSummary();
        if (!$summary) {
            return;
        }
        $el = $dom->createElement('itunes:summary');
        $text = $dom->createTextNode($summary);
        $el->appendChild($text);
        $root->appendChild($el);
        $this->called = true;
    }
}
