<?php
/**
 * Patch testing component for the Joomla! CMS
 *
 * @copyright  Copyright (C) 2011 - 2012 Ian MacLennan, Copyright (C) 2013 - 2018 Open Source Matters, Inc. All rights reserved.
 * @license    GNU General Public License version 2 or later
 */

namespace PatchTester\Model;

use Joomla\Archive\Zip;
use Joomla\CMS\Component\ComponentHelper;
use Joomla\CMS\Factory;
use Joomla\CMS\Filesystem\Path;
use Joomla\CMS\Http\HttpFactory;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Version;
use Joomla\Filesystem\File;
use Joomla\Filesystem\Folder;
use Joomla\Registry\Registry;
use PatchTester\GitHub\Exception\UnexpectedResponse;
use PatchTester\GitHub\GitHub;
use PatchTester\Helper;
use RuntimeException;
use stdClass;

/**
 * Methods supporting pull requests.
 *
 * @since  2.0
 */
class PullModel extends AbstractModel
{
	/**
	 * Array containing top level non-production folders
	 *
	 * @var    array
	 * @since  2.0
	 */
	protected $nonProductionFolders
		= array(
			'build',
			'docs',
			'installation',
			'tests',
			'.github',
		);

	/**
	 * Array containing non-production files
	 *
	 * @var    array
	 * @since  2.0
	 */
	protected $nonProductionFiles
		= array(
			'.drone.yml',
			'.gitignore',
			'.php_cs',
			'.travis.yml',
			'README.md',
			'build.xml',
			'composer.json',
			'composer.lock',
			'phpunit.xml.dist',
			'robots.txt.dist',
			'travisci-phpunit.xml',
			'LICENSE',
			'RoboFile.dist.ini',
			'RoboFile.php',
			'codeception.yml',
			'jorobo.dist.ini',
			'manifest.xml',
			'crowdin.yaml',
		);

	/**
	 * The namespace mapper
	 *
	 * @var    \JNamespacePsr4Map
	 * @since  4.0.0
	 */
	protected $namespaceMapper;

	/**
	 * Instantiate the model.
	 *
	 * @param   Registry          $state  The model state.
	 * @param   \JDatabaseDriver  $db     The database adpater.
	 *
	 * @since   4.0.0
	 */
	public function __construct(Registry $state = null, \JDatabaseDriver $db = null)
	{
		parent::__construct($state, $db);

		$this->namespaceMapper = new \JNamespacePsr4Map;
	}

	/**
	 * Patches the code with the supplied pull request
	 * However uses different methods for different repositories.
	 *
	 * @param   integer  $id  ID of the pull request to apply
	 *
	 * @return  boolean
	 *
	 * @since   3.0
	 *
	 * @throws  RuntimeException
	 */
	public function apply(int $id): bool
	{
		$params = ComponentHelper::getParams('com_patchtester');

		// Decide based on repository settings whether patch will be applied through Github or CIServer
		if ((bool) $params->get('ci_switch', 0))
		{
			return $this->applyWithCIServer($id);
		}

		return $this->applyWithGitHub($id);
	}

	/**
	 * Patches the code with the supplied pull request
	 *
	 * @param   integer  $id  ID of the pull request to apply
	 *
	 * @return  boolean
	 *
	 * @since   3.0
	 *
	 * @throws  RuntimeException
	 */
	private function applyWithCIServer(int $id): bool
	{
		// Get the CIServer Registry
		$ciSettings = Helper::initializeCISettings();

		// Get the Github object
		$github = Helper::initializeGithub();

		// Retrieve pullData for sha later on.
		$pull = $this->retrieveGitHubData($github, $id);

		if ($pull->head->repo === null)
		{
			throw new RuntimeException(Text::_('COM_PATCHTESTER_REPO_IS_GONE'));
		}

		$sha = $pull->head->sha;

		// Create tmp folder if it does not exist
		if (!file_exists($ciSettings->get('folder.temp')))
		{
			Folder::create($ciSettings->get('folder.temp'));
		}

		$tempPath    = $ciSettings->get('folder.temp') . '/' . $id;
		$backupsPath = $ciSettings->get('folder.backups') . '/' . $id;

		$delLogPath = $tempPath . '/' . $ciSettings->get('zip.log.name');
		$zipPath    = $tempPath . '/' . $ciSettings->get('zip.name');

		$serverZipPath = sprintf($ciSettings->get('zip.url'), $id);

		// Patch has already been applied
		if (file_exists($backupsPath))
		{
			return false;
		}

		$version    = new Version;
		$httpOption = new Registry;
		$httpOption->set('userAgent', $version->getUserAgent('Joomla', true, false));

		// Try to download the zip file
		try
		{
			$http   = HttpFactory::getHttp($httpOption);
			$result = $http->get($serverZipPath);
		}
		catch (RuntimeException $e)
		{
			$result = null;
		}

		if ($result === null || ($result->getStatusCode() !== 200 && $result->getStatusCode() !== 310))
		{
			throw new RuntimeException(Text::_('COM_PATCHTESTER_SERVER_RESPONDED_NOT_200'));
		}

		// Assign to variable to avlod PHP notice "Indirect modification of overloaded property"
		$content = (string) $result->getBody();

		// Write the file to disk
		File::write($zipPath, $content);

		// Check if zip folder could have been downloaded
		if (!file_exists($zipPath))
		{
			throw new RuntimeException(Text::_('COM_PATCHTESTER_ZIP_DOES_NOT_EXIST'));
		}

		Folder::create($tempPath);

		$zip = new Zip;

		if (!$zip->extract($zipPath, $tempPath))
		{
			Folder::delete($tempPath);
			throw new RuntimeException(Text::_('COM_PATCHTESTER_ZIP_EXTRACT_FAILED'));
		}

		// Remove zip to avoid get listing afterwards
		File::delete($zipPath);

		// Verify the composer autoloader for any invalid entries
		if ($this->verifyAutoloader($tempPath) === false)
		{
			// There is something broken in the autoloader, clean up and go back
			Folder::delete($tempPath);
			throw new RuntimeException(Text::_('COM_PATCHTESTER_PATCH_BREAKS_SITE'));
		}

		// Get files from deleted_logs
		$deletedFiles = (file_exists($delLogPath) ? file($delLogPath) : []);
		$deletedFiles = array_map('trim', $deletedFiles);

		if (file_exists($delLogPath))
		{
			// Remove deleted_logs to avoid get listing afterwards
			File::delete($delLogPath);
		}

		// Retrieve all files and merge them into one array
		$files = Folder::files($tempPath, null, true, true);
		$files = str_replace(Path::clean($tempPath . '\\'), '', $files);
		$files = array_merge($files, $deletedFiles);

		Folder::create($backupsPath);

		// Moves existent files to backup and replace them or creates new one if they don't exist
		foreach ($files as $key => $file)
		{
			try
			{
				$filePath = explode(DIRECTORY_SEPARATOR, Path::clean($file));
				array_pop($filePath);
				$filePath = implode(DIRECTORY_SEPARATOR, $filePath);

				// Deleted_logs returns files as well as folder, if value is folder, unset and skip
				if (is_dir(JPATH_ROOT . '/' . $file))
				{
					unset($files[$key]);
					continue;
				}

				if (file_exists(JPATH_ROOT . '/' . $file))
				{
					// Create directories if they don't exist until file
					if (!file_exists($backupsPath . '/' . $filePath))
					{
						Folder::create($backupsPath . '/' . $filePath);
					}

					File::move(JPATH_ROOT . '/' . $file, $backupsPath . '/' . $file);
				}

				if (file_exists($tempPath . '/' . $file))
				{
					// Create directories if they don't exist until file
					if (!file_exists(JPATH_ROOT . '/' . $filePath) || !is_dir(JPATH_ROOT . '/' . $filePath))
					{
						Folder::create(JPATH_ROOT . '/' . $filePath);
					}

					File::copy($tempPath . '/' . $file, JPATH_ROOT . '/' . $file);
				}
			}
			catch (RuntimeException $exception)
			{
				Folder::delete($tempPath);

				Folder::move($backupsPath, $backupsPath . '_failed');
				throw new RuntimeException(
					Text::sprintf('COM_PATCHTESTER_FAILED_APPLYING_PATCH', $file, $exception->getMessage())
				);
			}
		}

		// Clear temp folder and store applied patch in database
		Folder::delete($tempPath);

		$this->saveAppliedPatch($id, $files, $sha);

		// Update the autoloader file
		$this->namespaceMapper->create();

		// Change the media version
		$version = new Version;
		$version->refreshMediaVersion();

		return true;
	}

	/**
	 * Patches the code with the supplied pull request
	 *
	 * @param   GitHub   $github  github object
	 * @param   integer  $id      Id of the pull request
	 *
	 * @return  stdClass The pull request data
	 *
	 * @since   2.0
	 *
	 * @throws  RuntimeException
	 */
	private function retrieveGitHubData(GitHub $github, int $id): stdClass
	{
		try
		{
			$rateResponse = $github->getRateLimit();
			$rate         = json_decode($rateResponse->body, false);
		}
		catch (UnexpectedResponse $exception)
		{
			throw new RuntimeException(
				Text::sprintf('COM_PATCHTESTER_COULD_NOT_CONNECT_TO_GITHUB', $exception->getMessage()),
				$exception->getCode(),
				$exception
			);
		}

		// If over the API limit, we can't build this list
		if ((int) $rate->resources->core->remaining === 0)
		{
			throw new RuntimeException(
				Text::sprintf('COM_PATCHTESTER_API_LIMIT_LIST', Factory::getDate($rate->resources->core->reset))
			);
		}

		try
		{
			$pullResponse = $github->getPullRequest(
				$this->getState()->get('github_user'),
				$this->getState()->get('github_repo'),
				$id
			);
			$pull         = json_decode($pullResponse->body, false);
		}
		catch (UnexpectedResponse $exception)
		{
			throw new RuntimeException(
				Text::sprintf('COM_PATCHTESTER_COULD_NOT_CONNECT_TO_GITHUB', $exception->getMessage()),
				$exception->getCode(),
				$exception
			);
		}

		return $pull;
	}

	/**
	 * Verify if the autoload contains any broken entries.
	 *
	 * @param   string  $path  The path to look for the autoloader
	 *
	 * @return  boolean  True if there are broken dependencies | False otherwise.
	 *
	 * @since   4.0.0
	 */
	private function verifyAutoloader(string $path): bool
	{
		$result = false;

		// Check if we have an autoload file
		if (!file_exists($path . '/libraries/vendor/autoload.php'))
		{
			return $result;
		}

		$composerFiles = [
			'autoload_static.php',
			'autoload_files.php',
			'autoload_classmap.php',
			'autoload_namespaces.php',
			'autoload_psr4.php',
		];
		$filesToCheck  = [];

		array_walk(
			$composerFiles,
			static function ($composerFile) use (&$filesToCheck, $path) {
				if (file_exists($path . '/libraries/vendor/composer/' . $composerFile) === false)
				{
					return;
				}

				if ($composerFile === 'autoload_static.php')
				{
					// Get the generated token
					$autoload    = file_get_contents($path . '/libraries/vendor/autoload.php');
					$resultMatch = preg_match('/ComposerAutoloaderInit(.*)::/', $autoload, $match);

					if (!$resultMatch)
					{
						return;
					}

					// Check if the class is already defined
					$autoloadClass = '\Composer\Autoload\ComposerStaticInit' . $match[1];

					if (class_exists($autoloadClass))
					{
						return;
					}

					require_once $path . '/libraries/vendor/composer/autoload_static.php';

					// Get all the files
					$files = $autoloadClass::$files;

					$filesToCheck = array_merge($filesToCheck, $files);
				}
				else
				{
					$files = require $path . '/libraries/vendor/composer/' . $composerFile;

					$filesToCheck = array_merge($filesToCheck, $files);
				}
			}
		);

		return $this->checkFilesExist($filesToCheck, $path);
	}

	/**
	 * Check a list of files if they exist.
	 *
	 * @param   array   $files  The list of files to check
	 * @param   string  $path   The path where the temporary patch resides
	 *
	 * @return  boolean  True if all files exist | False otherwise.
	 *
	 * @since   4.0.0
	 */
	private function checkFilesExist(array $files, string $path): bool
	{
		$path = Path::clean($path);

		foreach ($files as $file)
		{
			if (is_array($file))
			{
				$this->checkFilesExist($file, $path);
			}
			elseif (!file_exists($file))
			{
				// Check if the file exists in the Joomla filesystem
				$file = str_ireplace($path, JPATH_SITE, $file);

				if (!file_exists($file))
				{
					return false;
				}
			}
		}

		return true;
	}

	/**
	 * Saves the applied patch into database
	 *
	 * @param   integer  $id        ID of the applied pull request
	 * @param   array    $fileList  List of files
	 * @param   string   $sha       sha-key from pull request
	 *
	 * @return  integer  $id    last inserted id
	 *
	 * @since   3.0
	 */
	private function saveAppliedPatch(int $id, array $fileList, string $sha = null): int
	{
		$record = (object) array(
			'pull_id'         => $id,
			'data'            => json_encode($fileList),
			'patched_by'      => Factory::getUser()->id,
			'applied'         => 1,
			'applied_version' => JVERSION,
		);

		$db = $this->getDb();

		$db->insertObject('#__patchtester_tests', $record);
		$insertId = $db->insertid();

		if ($sha !== null)
		{
			// Insert the retrieved commit SHA into the pulls table for this item
			$db->setQuery(
				$db->getQuery(true)
					->update('#__patchtester_pulls')
					->set('sha = ' . $db->quote($sha))
					->where($db->quoteName('pull_id') . ' = ' . $id)
			)->execute();
		}

		return $insertId;
	}

	/**
	 * Patches the code with the supplied pull request
	 *
	 * @param   integer  $id  ID of the pull request to apply
	 *
	 * @return  boolean
	 *
	 * @since   2.0
	 *
	 * @throws  RuntimeException
	 */
	private function applyWithGitHub(int $id): bool
	{
		$github = Helper::initializeGithub();

		$pull = $this->retrieveGitHubData($github, $id);

		if ($pull->head->repo === null)
		{
			throw new RuntimeException(Text::_('COM_PATCHTESTER_REPO_IS_GONE'));
		}

		try
		{
			$files = $this->getFiles($id, 1);
		}
		catch (UnexpectedResponse $exception)
		{
			throw new RuntimeException(
				Text::sprintf('COM_PATCHTESTER_COULD_NOT_CONNECT_TO_GITHUB', $exception->getMessage()),
				$exception->getCode(),
				$exception
			);
		}

		if (!count($files))
		{
			return false;
		}

		$parsedFiles = $this->parseFileList($files);

		if (!count($parsedFiles))
		{
			return false;
		}

		foreach ($parsedFiles as $file)
		{
			switch ($file->action)
			{
				case 'deleted':
					if (!file_exists(JPATH_ROOT . '/' . $file->filename))
					{
						throw new RuntimeException(
							Text::sprintf('COM_PATCHTESTER_FILE_DELETED_DOES_NOT_EXIST_S', $file->filename)
						);
					}

					break;

				case 'added':
				case 'modified':
				case 'renamed':
					// If the backup file already exists, we can't apply the patch
					if (file_exists(JPATH_COMPONENT . '/backups/' . md5($file->filename) . '.txt'))
					{
						throw new RuntimeException(Text::sprintf('COM_PATCHTESTER_CONFLICT_S', $file->filename));
					}

					if ($file->action === 'modified' && !file_exists(JPATH_ROOT . '/' . $file->filename))
					{
						throw new RuntimeException(
							Text::sprintf('COM_PATCHTESTER_FILE_MODIFIED_DOES_NOT_EXIST_S', $file->filename)
						);
					}

					try
					{
						$contentsResponse = $github->getFileContents(
							$pull->head->user->login,
							$pull->head->repo->name,
							$file->repofilename,
							urlencode($pull->head->ref)
						);

						$contents = json_decode($contentsResponse->body, false);

						// In case encoding type ever changes
						switch ($contents->encoding)
						{
							case 'base64':
								$file->body = base64_decode($contents->content);

								break;

							default:
								throw new RuntimeException(Text::_('COM_PATCHTESTER_ERROR_UNSUPPORTED_ENCODING'));
						}
					}
					catch (UnexpectedResponse $exception)
					{
						throw new RuntimeException(
							Text::sprintf('COM_PATCHTESTER_COULD_NOT_CONNECT_TO_GITHUB', $exception->getMessage()),
							$exception->getCode(),
							$exception
						);
					}

					break;
			}
		}

		// At this point, we have ensured that we have all the new files and there are no conflicts
		foreach ($parsedFiles as $file)
		{
			// We only create a backup if the file already exists
			if ($file->action === 'deleted'
				|| (file_exists(JPATH_ROOT . '/' . $file->filename) && $file->action === 'modified')
				|| (file_exists(JPATH_ROOT . '/' . $file->originalFile) && $file->action === 'renamed'))
			{
				$filename = $file->action === 'renamed' ? $file->originalFile : $file->filename;
				$src      = JPATH_ROOT . '/' . $filename;
				$dest     = JPATH_COMPONENT . '/backups/' . md5($filename) . '.txt';

				if (!File::copy(Path::clean($src), $dest))
				{
					throw new RuntimeException(Text::sprintf('COM_PATCHTESTER_ERROR_CANNOT_COPY_FILE', $src, $dest));
				}
			}

			switch ($file->action)
			{
				case 'modified':
				case 'added':
					if (!File::write(Path::clean(JPATH_ROOT . '/' . $file->filename), $file->body))
					{
						throw new RuntimeException(
							Text::sprintf('COM_PATCHTESTER_ERROR_CANNOT_WRITE_FILE', JPATH_ROOT . '/' . $file->filename)
						);
					}

					break;

				case 'deleted':
					if (!File::delete(Path::clean(JPATH_ROOT . '/' . $file->filename)))
					{
						throw new RuntimeException(
							Text::sprintf(
								'COM_PATCHTESTER_ERROR_CANNOT_DELETE_FILE',
								JPATH_ROOT . '/' . $file->filename
							)
						);
					}

					break;

				case 'renamed':
					if (!File::delete(Path::clean(JPATH_ROOT . '/' . $file->originalFile)))
					{
						throw new RuntimeException(
							Text::sprintf(
								'COM_PATCHTESTER_ERROR_CANNOT_DELETE_FILE',
								JPATH_ROOT . '/' . $file->originalFile
							)
						);
					}

					if (!File::write(Path::clean(JPATH_ROOT . '/' . $file->filename), $file->body))
					{
						throw new RuntimeException(
							Text::sprintf('COM_PATCHTESTER_ERROR_CANNOT_WRITE_FILE', JPATH_ROOT . '/' . $file->filename)
						);
					}

					break;
			}

			// We don't need the file's body any longer (and it causes issues with binary data when json_encode() is run), so remove it
			unset($file->body);
		}

		$this->saveAppliedPatch($pull->number, $parsedFiles, $pull->head->sha);

		// Update the autoloader file
		$this->namespaceMapper->create();

		// Change the media version
		$version = new Version;
		$version->refreshMediaVersion();

		return true;
	}

	/**
	 * Get all files from Github.
	 *
	 * @param   int    $id     The pull ID
	 * @param   int    $page   THhe page umber to process
	 * @param   array  $files  The list of files retrieved from Github
	 *
	 * @return  array  LIst of files to process.
	 *
	 * @since   4.2.0
	 */
	private function getFiles(int $id, int $page, array $files = []): array
	{
		$github = Helper::initializeGithub();

		$filesResponse = $github->getFilesForPullRequest(
			$this->getState()->get('github_user'),
			$this->getState()->get('github_repo'),
			$id,
			$page
		);

		$files    = array_merge($files, json_decode($filesResponse->getBody(), false));
		$lastPage = 1;

		preg_match(
			'/(\?page=[0-9]{1,3}>; rel=\"last\")/', $filesResponse->getHeaders()['link'][0], $matches
		);

		if ($matches && isset($matches[0]))
		{
			preg_match('/\d+/', $matches[0], $pages);
			$lastPage = (int) $pages[0];
		}

		if ($page <= $lastPage)
		{
			$files = $this->getFiles($id, ++$page, $files);
		}

		return $files;
	}

	/**
	 * Parse the list of modified files from a pull request
	 *
	 * @param   stdClass  $files  The modified files to parse
	 *
	 * @return  array
	 *
	 * @since   3.0.0
	 */
	private function parseFileList(array $files): array
	{
		$parsedFiles = array();

		/*
		 * Check if the patch tester is running in a development environment
		 * If we are not in development, we'll need to check the exclusion lists
		 */
		$isDev = file_exists(JPATH_INSTALLATION . '/index.php');

		foreach ($files as $file)
		{
			if (!$isDev)
			{
				$filePath = explode('/', $file->filename);

				if (in_array($filePath[0], $this->nonProductionFiles, true))
				{
					continue;
				}

				if (in_array($filePath[0], $this->nonProductionFolders, true))
				{
					continue;
				}
			}

			// Sometimes the repo filename is not the production file name
			$prodFileName        = $file->filename;
			$prodRenamedFileName = $file->previous_filename ?? false;
			$filePath            = explode('/', $prodFileName);

			// Remove the `src` here to match the CMS paths if needed
			if ($filePath[0] === 'src')
			{
				$prodFileName = str_replace('src/', '', $prodFileName);
			}

			if ($prodRenamedFileName)
			{
				$filePath = explode('/', $prodRenamedFileName);

				// Remove the `src` here to match the CMS paths if needed
				if ($filePath[0] === 'src')
				{
					$prodRenamedFileName = str_replace('src/', '', $prodRenamedFileName);
				}
			}

			$parsedFiles[] = (object) array(
				'action'       => $file->status,
				'filename'     => $prodFileName,
				'repofilename' => $file->filename,
				'fileurl'      => $file->contents_url,
				'originalFile' => $prodRenamedFileName,
			);
		}

		return $parsedFiles;
	}

	/**
	 * Reverts the specified pull request
	 * However uses different methods for different repositories.
	 *
	 * @param   integer  $id  ID of the pull request to revert
	 *
	 * @return  boolean
	 *
	 * @since   3.0
	 * @throws  RuntimeException
	 */
	public function revert(int $id): bool
	{
		$params = ComponentHelper::getParams('com_patchtester');

		// Decide based on repository settings whether patch will be applied through Github or CIServer
		if ((bool) $params->get('ci_switch', 0))
		{
			return $this->revertWithCIServer($id);
		}

		return $this->revertWithGitHub($id);
	}

	/**
	 * Reverts the specified pull request with CIServer options
	 *
	 * @param   integer  $id  ID of the pull request to revert
	 *
	 * @return  boolean
	 *
	 * @since   3.0
	 * @throws  RuntimeException
	 */
	public function revertWithCIServer(int $id): bool
	{
		// Get the CIServer Registry
		$ciSettings = Helper::initializeCISettings();

		$testRecord = $this->getTestRecord($id);

		// We don't want to restore files from an older version
		if ($testRecord->applied_version !== JVERSION)
		{
			return $this->removeTest($testRecord);
		}

		$files = json_decode($testRecord->data, false);

		if (!$files)
		{
			throw new RuntimeException(
				Text::sprintf(
					'COM_PATCHTESTER_ERROR_READING_DATABASE_TABLE',
					__METHOD__,
					htmlentities($testRecord->data)
				)
			);
		}

		$backupsPath = $ciSettings->get('folder.backups') . "/$testRecord->pull_id";

		foreach ($files as $file)
		{
			try
			{
				$filePath = explode("\\", $file);
				array_pop($filePath);
				$filePath = implode("\\", $filePath);

				// Delete file from root of it exists
				if (file_Exists(JPATH_ROOT . "/$file"))
				{
					File::delete(JPATH_ROOT . "/$file");

					// Move from backup, if it exists there
					if (file_exists($backupsPath . '/' . $file))
					{
						File::move($backupsPath . '/' . $file, JPATH_ROOT . '/' . $file);
					}

					// If folder is empty, remove it as well
					if (count(glob(JPATH_ROOT . '/' . $filePath . '/*')) === 0)
					{
						Folder::delete(JPATH_ROOT . '/' . $filePath);
					}
				}
				// Move from backup, if file exists there - got deleted by patch
				elseif (file_exists($backupsPath . '/' . $file))
				{
					if (!file_exists(JPATH_ROOT . '/' . $filePath))
					{
						Folder::create(JPATH_ROOT . '/' . $filePath);
					}

					File::move($backupsPath . '/' . $file, JPATH_ROOT . '/' . $file);
				}
			}
			catch (RuntimeException $exception)
			{
				throw new RuntimeException(
					Text::sprintf('COM_PATCHTESTER_FAILED_REVERT_PATCH', $file, $exception->getMessage())
				);
			}
		}

		Folder::delete($backupsPath);

		// Update the autoloader file
		$this->namespaceMapper->create();

		// Change the media version
		$version = new Version;
		$version->refreshMediaVersion();

		return $this->removeTest($testRecord);
	}

	/**
	 * Retrieves test data from database by specific id
	 *
	 * @param   integer  $id  ID of the record
	 *
	 * @return  stdClass  $testRecord  The record looking for
	 *
	 * @since   3.0.0
	 */
	private function getTestRecord(int $id): stdClass
	{
		$db = $this->getDb();

		return $db->setQuery(
			$db->getQuery(true)
				->select('*')
				->from('#__patchtester_tests')
				->where('id = ' . (int) $id)
		)->loadObject();
	}

	/**
	 * Remove the database record for a test
	 *
	 * @param   stdClass  $testRecord  The record being deleted
	 *
	 * @return  boolean
	 *
	 * @since   3.0.0
	 */
	private function removeTest(stdClass $testRecord): bool
	{
		$db = $this->getDb();

		// Remove the retrieved commit SHA from the pulls table for this item
		$db->setQuery(
			$db->getQuery(true)
				->update('#__patchtester_pulls')
				->set('sha = ' . $db->quote(''))
				->where($db->quoteName('id') . ' = ' . (int) $testRecord->id)
		)->execute();

		// And delete the record from the tests table
		$db->setQuery(
			$db->getQuery(true)
				->delete('#__patchtester_tests')
				->where('id = ' . (int) $testRecord->id)
		)->execute();

		return true;
	}

	/**
	 * Reverts the specified pull request with Github Requests
	 *
	 * @param   integer  $id  ID of the pull request to revert
	 *
	 * @return  boolean
	 *
	 * @since   2.0
	 * @throws  RuntimeException
	 */
	public function revertWithGitHub(int $id): bool
	{
		$testRecord = $this->getTestRecord($id);

		// We don't want to restore files from an older version
		if ($testRecord->applied_version != JVERSION)
		{
			return $this->removeTest($testRecord);
		}

		$files = json_decode($testRecord->data, false);

		if (!$files)
		{
			throw new RuntimeException(
				Text::sprintf(
					'COM_PATCHTESTER_ERROR_READING_DATABASE_TABLE',
					__METHOD__,
					htmlentities($testRecord->data)
				)
			);
		}

		foreach ($files as $file)
		{
			switch ($file->action)
			{
				case 'deleted':
				case 'modified':
					$src  = JPATH_COMPONENT . '/backups/' . md5($file->filename) . '.txt';
					$dest = JPATH_ROOT . '/' . $file->filename;

					if (!File::copy($src, $dest))
					{
						throw new RuntimeException(
							Text::sprintf('COM_PATCHTESTER_ERROR_CANNOT_COPY_FILE', $src, $dest)
						);
					}

					if (file_exists($src))
					{
						if (!File::delete($src))
						{
							throw new RuntimeException(
								Text::sprintf('COM_PATCHTESTER_ERROR_CANNOT_DELETE_FILE', $src)
							);
						}
					}

					break;

				case 'added':
					$src = JPATH_ROOT . '/' . $file->filename;

					if (file_exists($src))
					{
						if (!File::delete($src))
						{
							throw new RuntimeException(
								Text::sprintf('COM_PATCHTESTER_ERROR_CANNOT_DELETE_FILE', $src)
							);
						}
					}

					break;

				case 'renamed':
					$originalSrc = JPATH_COMPONENT . '/backups/' . md5($file->originalFile) . '.txt';
					$newSrc      = JPATH_ROOT . '/' . $file->filename;
					$dest        = JPATH_ROOT . '/' . $file->originalFile;

					if (!File::copy($originalSrc, $dest))
					{
						throw new RuntimeException(
							Text::sprintf('COM_PATCHTESTER_ERROR_CANNOT_COPY_FILE', $originalSrc, $dest)
						);
					}

					if (file_exists($originalSrc))
					{
						if (!File::delete($originalSrc))
						{
							throw new RuntimeException(
								Text::sprintf('COM_PATCHTESTER_ERROR_CANNOT_DELETE_FILE', $originalSrc)
							);
						}
					}

					if (file_exists($newSrc))
					{
						if (!File::delete($newSrc))
						{
							throw new RuntimeException(
								Text::sprintf('COM_PATCHTESTER_ERROR_CANNOT_DELETE_FILE', $newSrc)
							);
						}
					}

					break;
			}
		}

		// Update the autoloader file
		$this->namespaceMapper->create();

		// Change the media version
		$version = new Version;
		$version->refreshMediaVersion();

		return $this->removeTest($testRecord);
	}
}