<?php
/**
*
* This file is part of the phpBB Forum Software package.
*
* @copyright (c) phpBB Limited <https://www.phpbb.com>
* @license GNU General Public License, version 2 (GPL-2.0)
*
* For full copyright and license information, please see
* the docs/CREDITS.txt file.
*
*/

namespace phpbb\extension;

use Symfony\Component\DependencyInjection\ContainerInterface;

/**
* A base class for extensions without custom enable/disable/purge code.
*/
class base implements \phpbb\extension\extension_interface
{
	/** @var ContainerInterface */
	protected $container;

	/** @var \phpbb\finder */
	protected $finder;

	/** @var \phpbb\db\migrator */
	protected $migrator;

	/** @var string */
	protected $extension_name;

	/** @var string */
	protected $extension_path;

	/** @var string[] */
	private $migrations = false;

	/**
	* Constructor
	*
	* @param ContainerInterface $container Container object
	* @param \phpbb\finder $extension_finder
	* @param \phpbb\db\migrator $migrator
	* @param string $extension_name Name of this extension (from ext.manager)
	* @param string $extension_path Relative path to this extension
	*/
	public function __construct(ContainerInterface $container, \phpbb\finder $extension_finder, \phpbb\db\migrator $migrator, $extension_name, $extension_path)
	{
		$this->container = $container;
		$this->extension_finder = $extension_finder;
		$this->migrator = $migrator;

		$this->extension_name = $extension_name;
		$this->extension_path = $extension_path;
	}

	/**
	* {@inheritdoc}
	*/
	public function is_enableable()
	{
		return true;
	}

	/**
	* Single enable step that installs any included migrations
	*
	* @param mixed $old_state State returned by previous call of this method
	* @return false Indicates no further steps are required
	*/
	public function enable_step($old_state)
	{
		$migrations = $this->get_migration_file_list();

		$this->migrator->set_migrations($migrations);

		$this->migrator->update();

		return !$this->migrator->finished();
	}

	/**
	* Single disable step that does nothing
	*
	* @param mixed $old_state State returned by previous call of this method
	* @return false Indicates no further steps are required
	*/
	public function disable_step($old_state)
	{
		return false;
	}

	/**
	* Single purge step that reverts any included and installed migrations
	*
	* @param mixed $old_state State returned by previous call of this method
	* @return false Indicates no further steps are required
	*/
	public function purge_step($old_state)
	{
		$migrations = $this->get_migration_file_list();

		$this->migrator->set_migrations($migrations);

		foreach ($migrations as $migration)
		{
			while ($this->migrator->migration_state($migration) !== false)
			{
				$this->migrator->revert($migration);

				return true;
			}
		}

		return false;
	}

	/**
	* Get the list of migration files from this extension
	*
	* @var bool $validate_classes Whether or not to check that the migration
	*		class exists and extends the base migration class.
	* @return array
	*/
	protected function get_migration_file_list($validate_classes = true)
	{
		if ($this->migrations !== false)
		{
			return $this->migrations;
		}

		// Only have the finder search in this extension path directory
		$migrations = $this->extension_finder
			->extension_directory('/migrations')
			->find_from_extension($this->extension_name, $this->extension_path);

		$migrations = $this->extension_finder->get_classes_from_files($migrations);

		if ($validate_classes)
		{
			foreach ($migrations as $key => $migration)
			{
				// If the class exists and is a subclass of the
				// \phpbb\db\migration\migration abstract class
				// we skip it.

				// Otherwise, i.e. if it doesn't exist or it is
				// not an extend the abstract class, we unset it
				if (class_exists($migration))
				{
					$reflector = new \ReflectionClass($migration);
					if ($reflector->isSubclassOf('\phpbb\db\migration\migration'))
					{
						continue;
					}

				}

				unset($migrations[$key]);
			}
		}

		return $migrations;
	}
}