<?php

namespace RSSWriter;

use RSSWriter\SimpleXMLElement;

class Item implements \RSSWriter\ItemInterface
{
    /** @var string */
    protected $title;
    /** @var string */
    protected $url;
    /** @var string */
    protected $description;
    /** @var array */
    protected $categories = array();
    /** @var string */
    protected $guid;
    /** @var bool */
    protected $isPermalink;
    /** @var int */
    protected $pubDate;
    /** @var array */
    protected $enclosure;
    /** @var string */
    protected $author;

    /**
     * Set item title
     * @param  string $title
     * @return $this
     */
    public function title($title)
    {
        $this->title = $title;

        return $this;
    }

    /**
     * Set item URL
     * @param  string $url
     * @return $this
     */
    public function url($url)
    {
        $this->url = $url;

        return $this;
    }

    /**
     * Set item description
     * @param  string $description
     * @return $this
     */
    public function description($description)
    {
        $this->description = $description;

        return $this;
    }

    /**
     * Set item category
     * @param  string $name   Category name
     * @param  string $domain Category URL
     * @return $this
     */
    public function category($name, $domain = null)
    {
        $this->categories[] = array($name, $domain);

        return $this;
    }

    /**
     * Set GUID
     * @param  string $guid
     * @param  bool   $isPermalink
     * @return $this
     */
    public function guid($guid, $isPermalink = false)
    {
        $this->guid = $guid;
        $this->isPermalink = $isPermalink;

        return $this;
    }

    /**
     * Set published date
     * @param  int   $pubDate Unix timestamp
     * @return $this
     */
    public function pubDate($pubDate)
    {
        $this->pubDate = $pubDate;

        return $this;
    }

    /**
     * Set enclosure
     * @param  var   $url    Url to media file
     * @param  int   $length Length in bytes of the media file
     * @param  var   $type   Media type, default is audio/mpeg
     * @return $this
     */
    public function enclosure($url, $length = 0, $type = 'audio/mpeg')
    {
        $this->enclosure = array('url' => $url, 'length' => $length, 'type' => $type);

        return $this;
    }

    /**
     * Set the author
     * @param  string $author Email of item author
     * @return $this
     */
    public function author($author)
    {
        $this->author = $author;

        return $this;
    }

    /**
     * Append item to the channel
     * @param  \RSSWriter\ChannelInterface $channel
     * @return $this
     */
    public function appendTo(ChannelInterface $channel)
    {
        $channel->addItem($this);

        return $this;
    }

    /**
     * Return XML object
     * @return \RSSWriter\SimpleXMLElement
     */
    public function asXML()
    {
        $xml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8" ?><item></item>', LIBXML_NOERROR|LIBXML_ERR_NONE|LIBXML_ERR_FATAL);
        $xml->addChild('title', $this->title);
        $xml->addChild('link', $this->url);
        $xml->addChild('description', $this->description);

        foreach ($this->categories as $category) {
            $element = $xml->addChild('category', $category[0]);

            if (isset($category[1])) {
                $element->addAttribute('domain', $category[1]);
            }
        }

        if ($this->guid) {
            $guid = $xml->addChild('guid', $this->guid);

            if ($this->isPermalink) {
                $guid->addAttribute('isPermaLink', 'true');
            }
        }

        if ($this->pubDate !== null) {
            $xml->addChild('pubDate', date(DATE_RSS, $this->pubDate));
        }

        if (is_array($this->enclosure) && (count($this->enclosure) == 3)) {
            $element = $xml->addChild('enclosure');
            $element->addAttribute('url', $this->enclosure['url']);
            $element->addAttribute('type', $this->enclosure['type']);

            if ($this->enclosure['length']) {
                $element->addAttribute('length', $this->enclosure['length']);
            }
        }

        if (! empty($this->author)) {
            $xml->addChild('author', $this->author);
        }

        return $xml;
    }
}
