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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2020 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Console;

\defined('JPATH_PLATFORM') or die;

use Joomla\Console\Command\AbstractCommand;
use Joomla\Database\DatabaseInterface;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Style\SymfonyStyle;

/**
 * Console command for listing installed extensions
 *
 * @since  4.0.0
 */
class ExtensionsListCommand extends AbstractCommand
{
	/**
	 * The default command name
	 *
	 * @var    string
	 * @since  4.0.0
	 */
	protected static $defaultName = 'extension:list';

/**
	 * Stores the installed Extensions
	 * @var array
	 * @since 4.0.0
	 */
	protected $extensions;

/**
	 * Stores the Input Object
	 * @var InputInterface
	 * @since 4.0.0
	 */
	protected $cliInput;

/**
	 * SymfonyStyle Object
	 * @var   SymfonyStyle
	 * @since 4.0.0
	 */
	protected $ioStyle;

/**
	 * Database connector
	 *
	 * @var    DatabaseInterface
	 * @since  4.0.0
	 */
	private $db;

/**
	 * Instantiate the command.
	 *
	 * @param   DatabaseInterface  $db  Database connector
	 *
	 * @since   4.0.0
	 */
	public function __construct(DatabaseInterface $db)
	{
		$this->db = $db;
		parent::__construct();
	}

/**
	 * Configures the IO
	 *
	 * @param   InputInterface   $input   Console Input
	 * @param   OutputInterface  $output  Console Output
	 *
	 * @return void
	 *
	 * @since 4.0.0
	 *
	 */
	protected function configureIO(InputInterface $input, OutputInterface $output): void
	{
		$this->cliInput = $input;
		$this->ioStyle = new SymfonyStyle($input, $output);
	}

/**
	 * Initialise the command.
	 *
	 * @return  void
	 *
	 * @since   4.0.0
	 */
	protected function configure(): void
	{

$this->addOption('type', null, InputOption::VALUE_REQUIRED, 'Type of the extension');

$help = "<info>%command.name%</info> lists all installed extensions
		\nUsage: <info>php %command.full_name% <extension_id></info>
		\nYou may filter on the type of extension (component, module, plugin, etc.) using the <info>--type</info> option:
		\n  <info>php %command.full_name% --type=<type></info>";

$this->setDescription('List installed extensions');
		$this->setHelp($help);
	}

/**
	 * Retrieves all extensions
	 *
	 * @return mixed
	 *
	 * @since 4.0.0
	 */
	public function getExtensions()
	{
		if (!$this->extensions)
		{
			$this->setExtensions();
		}

return $this->extensions;
	}

/**
	 * Retrieves the extension from the model and sets the class variable
	 *
	 * @param   null  $extensions  Array of extensions
	 *
	 * @return void
	 *
	 * @since 4.0.0
	 */
	public function setExtensions($extensions = null): void
	{
		if (!$extensions)
		{
			$this->extensions = $this->getAllExtensionsFromDB();
		}
		else
		{
			$this->extensions = $extensions;
		}
	}

/**
	 * Retrieves extension list from DB
	 *
	 * @return array
	 *
	 * @since 4.0.0
	 */
	private function getAllExtensionsFromDB(): array
	{
		$db    = $this->db;
		$query = $db->getQuery(true);
		$query->select('*')
			->from('#__extensions');
		$db->setQuery($query);
		$extensions = $db->loadAssocList('extension_id');

return $extensions;
	}

/**
	 * Transforms extension arrays into required form
	 *
	 * @param   array  $extensions  Array of extensions
	 *
	 * @return array
	 *
	 * @since 4.0.0
	 */
	protected function getExtensionsNameAndId($extensions): array
	{
		$extInfo = [];

foreach ($extensions as $key => $extension)
		{
			$manifest = json_decode($extension['manifest_cache']);
			$extInfo[] = [
				$extension['name'],
				$extension['extension_id'],
				$manifest ? $manifest->version : '--',
				$extension['type'],
				$extension['enabled'] == 1 ? 'Yes' : 'No',
			];
		}

return $extInfo;
	}

/**
	 * Filters the extension type
	 *
	 * @param   string  $type  Extension type
	 *
	 * @return array
	 *
	 * @since 4.0.0
	 */
	private function filterExtensionsBasedOn($type): array
	{
		$extensions = [];

foreach ($this->extensions as $key => $extension)
		{
			if ($extension['type'] == $type)
			{
				$extensions[] = $extension;
			}
		}

return $extensions;
	}

/**
	 * Internal function to execute the command.
	 *
	 * @param   InputInterface   $input   The input to inject into the command.
	 * @param   OutputInterface  $output  The output to inject into the command.
	 *
	 * @return  integer  The command exit code
	 *
	 * @since   4.0.0
	 */
	protected function doExecute(InputInterface $input, OutputInterface $output): int
	{
		$this->configureIO($input, $output);
		$extensions = $this->getExtensions();
		$type = $this->cliInput->getOption('type');

if ($type)
		{
			$extensions = $this->filterExtensionsBasedOn($type);
		}

if (empty($extensions))
		{
			$this->ioStyle->error("Cannot find extensions of the type '$type' specified.");

return Command::SUCCESS;
		}

$extensions = $this->getExtensionsNameAndId($extensions);

$this->ioStyle->title('Installed extensions.');
		$this->ioStyle->table(['Name', 'Extension ID', 'Version', 'Type', 'Active'], $extensions);

return Command::SUCCESS;
	}
}