<?php
/**
 * @package   FOF
 * @copyright Copyright (c)2010-2022 Nicholas K. Dionysopoulos / Akeeba Ltd
 * @license   GNU General Public License version 3, or later
 */

namespace FOF40\Update;

defined('_JEXEC') || die;

use Exception;
use FOF40\Container\Container;
use FOF40\Download\Download;
use SimpleXMLElement;

/**
 * A helper class to read and parse "extension" update XML files over the web
 */
class Extension
{
	/**
	 * Reads an "extension" XML update source and returns all listed update entries.
	 *
	 * If you have a "collection" XML update source you should do something like this:
	 * $collection = new \FOF40\Update\Collection();
	 * $extensionUpdateURL = $collection->getExtensionUpdateSource($url, 'component', 'com_foobar', JVERSION);
	 * $extension = new \FOF40\Update\Extension();
	 * $updates = $extension->getUpdatesFromExtension($extensionUpdateURL);
	 *
	 * @param string $url The extension XML update source URL to read from
	 *
	 * @return  array  An array of update entries
	 */
	public function getUpdatesFromExtension(string $url): array
	{
		// Initialise
		$ret = [];

		// Get and parse the XML source
		$container  = Container::getInstance('com_FOOBAR');
		$downloader = new Download($container);
		$xmlSource  = $downloader->getFromURL($url);

		try
		{
			$xml = new SimpleXMLElement($xmlSource, LIBXML_NONET);
		}
		catch (Exception $e)
		{
			return $ret;
		}

		// Sanity check
		if (($xml->getName() != 'updates'))
		{
			unset($xml);

			return $ret;
		}

		// Let's populate the list of updates
		/** @var SimpleXMLElement $update */
		foreach ($xml->children() as $update)
		{
			// Sanity check
			if ($update->getName() != 'update')
			{
				continue;
			}

			$entry = [
				'infourl'        => ['title' => '', 'url' => ''],
				'downloads'      => [],
				'tags'           => [],
				'targetplatform' => [],
			];

			$properties = get_object_vars($update);

			foreach ($properties as $nodeName => $nodeContent)
			{
				switch ($nodeName)
				{
					default:
						$entry[$nodeName] = $nodeContent;
						break;

					case 'infourl':
					case 'downloads':
					case 'tags':
					case 'targetplatform':
						break;
				}
			}

			$infourlNode               = $update->xpath('infourl');
			$entry['infourl']['title'] = (string) $infourlNode[0]['title'];
			$entry['infourl']['url']   = (string) $infourlNode[0];

			$downloadNodes = $update->xpath('downloads/downloadurl');
			foreach ($downloadNodes as $downloadNode)
			{
				$entry['downloads'][] = [
					'type'   => (string) $downloadNode['type'],
					'format' => (string) $downloadNode['format'],
					'url'    => (string) $downloadNode,
				];
			}

			$tagNodes = $update->xpath('tags/tag');
			foreach ($tagNodes as $tagNode)
			{
				$entry['tags'][] = (string) $tagNode;
			}

			/** @var SimpleXMLElement[] $targetPlatformNode */
			$targetPlatformNode = $update->xpath('targetplatform');

			$entry['targetplatform']['name']    = (string) $targetPlatformNode[0]['name'];
			$entry['targetplatform']['version'] = (string) $targetPlatformNode[0]['version'];
			$client                             = $targetPlatformNode[0]->xpath('client');
			$entry['targetplatform']['client']  = (is_array($client) && count($client)) ? (string) $client[0] : '';
			$folder                             = $targetPlatformNode[0]->xpath('folder');
			$entry['targetplatform']['folder']  = is_array($folder) && count($folder) ? (string) $folder[0] : '';

			$ret[] = $entry;
		}

		unset($xml);

		return $ret;
	}
}