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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2012 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Feed;

\defined('JPATH_PLATFORM') or die;

use Joomla\CMS\Date\Date;

/**
 * Class to encapsulate a feed entry for the Joomla Platform.
 *
 * @property  FeedPerson  $author         Person responsible for feed entry content.
 * @property  array       $categories     Categories to which the feed entry belongs.
 * @property  string      $content        The content of the feed entry.
 * @property  array       $contributors   People who contributed to the feed entry content.
 * @property  string      $copyright      Information about rights, e.g. copyrights, held in and over the feed entry.
 * @property  array       $links          Links associated with the feed entry.
 * @property  Date        $publishedDate  The publication date for the feed entry.
 * @property  Feed        $source         The feed from which the entry is sourced.
 * @property  string      $title          A human readable title for the feed entry.
 * @property  Date        $updatedDate    The last time the content of the feed entry changed.
 * @property  string      $uri            Universal, permanent identifier for the feed entry.
 *
 * @since  3.1.4
 */
class FeedEntry
{
	/**
	 * @var    array  The entry properties.
	 * @since  3.1.4
	 */
	protected $properties = array(
		'uri'  => '',
		'title' => '',
		'updatedDate' => '',
		'content' => '',
		'categories' => array(),
		'contributors' => array(),
		'links' => array(),
	);

	/**
	 * Magic method to return values for feed entry properties.
	 *
	 * @param   string  $name  The name of the property.
	 *
	 * @return  mixed
	 *
	 * @since   3.1.4
	 */
	public function __get($name)
	{
		return $this->properties[$name] ?? null;
	}

	/**
	 * Magic method to set values for feed properties.
	 *
	 * @param   string  $name   The name of the property.
	 * @param   mixed   $value  The value to set for the property.
	 *
	 * @return  void
	 *
	 * @since   3.1.4
	 */
	public function __set($name, $value)
	{
		// Ensure that setting a date always sets a Date instance.
		if ((($name === 'updatedDate') || ($name === 'publishedDate')) && !($value instanceof Date))
		{
			$value = new Date($value);
		}

		// Validate that any authors that are set are instances of JFeedPerson or null.
		if (($name === 'author') && (!($value instanceof FeedPerson) || ($value === null)))
		{
			throw new \InvalidArgumentException(
				sprintf(
					'%1$s "author" must be an instance of Joomla\\CMS\\Feed\\FeedPerson. %2$s given.',
					\get_class($this),
					\gettype($value) === 'object' ? \get_class($value) : \gettype($value)
				)
			);
		}

		// Validate that any sources that are set are instances of JFeed or null.
		if (($name === 'source') && (!($value instanceof Feed) || ($value === null)))
		{
			throw new \InvalidArgumentException(
				sprintf(
					'%1$s "source" must be an instance of Joomla\\CMS\\Feed\\Feed. %2$s given.',
					\get_class($this),
					\gettype($value) === 'object' ? \get_class($value) : \gettype($value)
				)
			);
		}

		// Disallow setting categories, contributors, or links directly.
		if (\in_array($name, array('categories', 'contributors', 'links')))
		{
			throw new \InvalidArgumentException(
				sprintf(
					'Cannot directly set %1$s property "%2$s".',
					\get_class($this),
					$name
				)
			);
		}

		$this->properties[$name] = $value;
	}

	/**
	 * Method to add a category to the feed entry object.
	 *
	 * @param   string  $name  The name of the category to add.
	 * @param   string  $uri   The optional URI for the category to add.
	 *
	 * @return  FeedEntry
	 *
	 * @since   3.1.4
	 */
	public function addCategory($name, $uri = '')
	{
		$this->properties['categories'][$name] = $uri;

		return $this;
	}

	/**
	 * Method to add a contributor to the feed entry object.
	 *
	 * @param   string  $name   The full name of the person to add.
	 * @param   string  $email  The email address of the person to add.
	 * @param   string  $uri    The optional URI for the person to add.
	 * @param   string  $type   The optional type of person to add.
	 *
	 * @return  FeedEntry
	 *
	 * @since   3.1.4
	 */
	public function addContributor($name, $email, $uri = null, $type = null)
	{
		$contributor = new FeedPerson($name, $email, $uri, $type);

		// If the new contributor already exists then there is nothing to do, so just return.
		foreach ($this->properties['contributors'] as $c)
		{
			if ($c == $contributor)
			{
				return $this;
			}
		}

		// Add the new contributor.
		$this->properties['contributors'][] = $contributor;

		return $this;
	}

	/**
	 * Method to add a link to the feed entry object.
	 *
	 * @param   FeedLink  $link  The link object to add.
	 *
	 * @return  FeedEntry
	 *
	 * @since   3.1.4
	 */
	public function addLink(FeedLink $link)
	{
		// If the new link already exists then there is nothing to do, so just return.
		foreach ($this->properties['links'] as $l)
		{
			if ($l == $link)
			{
				return $this;
			}
		}

		// Add the new link.
		$this->properties['links'][] = $link;

		return $this;
	}

	/**
	 * Method to remove a category from the feed entry object.
	 *
	 * @param   string  $name  The name of the category to remove.
	 *
	 * @return  FeedEntry
	 *
	 * @since   3.1.4
	 */
	public function removeCategory($name)
	{
		unset($this->properties['categories'][$name]);

		return $this;
	}

	/**
	 * Method to remove a contributor from the feed entry object.
	 *
	 * @param   FeedPerson  $contributor  The person object to remove.
	 *
	 * @return  FeedEntry
	 *
	 * @since   3.1.4
	 */
	public function removeContributor(FeedPerson $contributor)
	{
		// If the contributor exists remove it.
		foreach ($this->properties['contributors'] as $k => $c)
		{
			if ($c == $contributor)
			{
				unset($this->properties['contributors'][$k]);
				$this->properties['contributors'] = array_values($this->properties['contributors']);

				return $this;
			}
		}

		return $this;
	}

	/**
	 * Method to remove a link from the feed entry object.
	 *
	 * @param   FeedLink  $link  The link object to remove.
	 *
	 * @return  FeedEntry
	 *
	 * @since   3.1.4
	 */
	public function removeLink(FeedLink $link)
	{
		// If the link exists remove it.
		foreach ($this->properties['links'] as $k => $l)
		{
			if ($l == $link)
			{
				unset($this->properties['links'][$k]);
				$this->properties['links'] = array_values($this->properties['links']);

				return $this;
			}
		}

		return $this;
	}

	/**
	 * Shortcut method to set the author for the feed entry object.
	 *
	 * @param   string  $name   The full name of the person to set.
	 * @param   string  $email  The email address of the person to set.
	 * @param   string  $uri    The optional URI for the person to set.
	 * @param   string  $type   The optional type of person to set.
	 *
	 * @return  FeedEntry
	 *
	 * @since   3.1.4
	 */
	public function setAuthor($name, $email, $uri = null, $type = null)
	{
		$author = new FeedPerson($name, $email, $uri, $type);

		$this->properties['author'] = $author;

		return $this;
	}
}