class LibraryInstaller

class LibraryInstaller implements InstallerInterface, BinaryPresenceInterface {
    
    /** @var PartialComposer */
    protected $composer;
    
    /** @var string */
    protected $vendorDir;
    
    /** @var DownloadManager|null */
    protected $downloadManager;
    
    /** @var IOInterface */
    protected $io;
    
    /** @var string */
    protected $type;
    
    /** @var Filesystem */
    protected $filesystem;
    
    /** @var BinaryInstaller */
    protected $binaryInstaller;
    
    /**
     * Initializes library installer.
     *
     * @param Filesystem      $filesystem
     * @param BinaryInstaller $binaryInstaller
     */
    public function __construct(IOInterface $io, PartialComposer $composer, ?string $type = 'library', ?Filesystem $filesystem = null, ?BinaryInstaller $binaryInstaller = null) {
        $this->composer = $composer;
        $this->downloadManager = $composer instanceof Composer ? $composer->getDownloadManager() : null;
        $this->io = $io;
        $this->type = $type;
        $this->filesystem = $filesystem ?: new Filesystem();
        $this->vendorDir = rtrim($composer->getConfig()
            ->get('vendor-dir'), '/');
        $this->binaryInstaller = $binaryInstaller ?: new BinaryInstaller($this->io, rtrim($composer->getConfig()
            ->get('bin-dir'), '/'), $composer->getConfig()
            ->get('bin-compat'), $this->filesystem, $this->vendorDir);
    }
    
    /**
     * @inheritDoc
     */
    public function supports(string $packageType) {
        return $packageType === $this->type || null === $this->type;
    }
    
    /**
     * @inheritDoc
     */
    public function isInstalled(InstalledRepositoryInterface $repo, PackageInterface $package) {
        if (!$repo->hasPackage($package)) {
            return false;
        }
        $installPath = $this->getInstallPath($package);
        if (Filesystem::isReadable($installPath)) {
            return true;
        }
        if (Platform::isWindows() && $this->filesystem
            ->isJunction($installPath)) {
            return true;
        }
        if (is_link($installPath)) {
            if (realpath($installPath) === false) {
                return false;
            }
            return true;
        }
        return false;
    }
    
    /**
     * @inheritDoc
     */
    public function download(PackageInterface $package, ?PackageInterface $prevPackage = null) {
        $this->initializeVendorDir();
        $downloadPath = $this->getInstallPath($package);
        return $this->getDownloadManager()
            ->download($package, $downloadPath, $prevPackage);
    }
    
    /**
     * @inheritDoc
     */
    public function prepare($type, PackageInterface $package, ?PackageInterface $prevPackage = null) {
        $this->initializeVendorDir();
        $downloadPath = $this->getInstallPath($package);
        return $this->getDownloadManager()
            ->prepare($type, $package, $downloadPath, $prevPackage);
    }
    
    /**
     * @inheritDoc
     */
    public function cleanup($type, PackageInterface $package, ?PackageInterface $prevPackage = null) {
        $this->initializeVendorDir();
        $downloadPath = $this->getInstallPath($package);
        return $this->getDownloadManager()
            ->cleanup($type, $package, $downloadPath, $prevPackage);
    }
    
    /**
     * @inheritDoc
     */
    public function install(InstalledRepositoryInterface $repo, PackageInterface $package) {
        $this->initializeVendorDir();
        $downloadPath = $this->getInstallPath($package);
        // remove the binaries if it appears the package files are missing
        if (!Filesystem::isReadable($downloadPath) && $repo->hasPackage($package)) {
            $this->binaryInstaller
                ->removeBinaries($package);
        }
        $promise = $this->installCode($package);
        if (!$promise instanceof PromiseInterface) {
            $promise = \React\Promise\resolve(null);
        }
        $binaryInstaller = $this->binaryInstaller;
        $installPath = $this->getInstallPath($package);
        return $promise->then(static function () use ($binaryInstaller, $installPath, $package, $repo) : void {
            $binaryInstaller->installBinaries($package, $installPath);
            if (!$repo->hasPackage($package)) {
                $repo->addPackage(clone $package);
            }
        });
    }
    
    /**
     * @inheritDoc
     */
    public function update(InstalledRepositoryInterface $repo, PackageInterface $initial, PackageInterface $target) {
        if (!$repo->hasPackage($initial)) {
            throw new \InvalidArgumentException('Package is not installed: ' . $initial);
        }
        $this->initializeVendorDir();
        $this->binaryInstaller
            ->removeBinaries($initial);
        $promise = $this->updateCode($initial, $target);
        if (!$promise instanceof PromiseInterface) {
            $promise = \React\Promise\resolve(null);
        }
        $binaryInstaller = $this->binaryInstaller;
        $installPath = $this->getInstallPath($target);
        return $promise->then(static function () use ($binaryInstaller, $installPath, $target, $initial, $repo) : void {
            $binaryInstaller->installBinaries($target, $installPath);
            $repo->removePackage($initial);
            if (!$repo->hasPackage($target)) {
                $repo->addPackage(clone $target);
            }
        });
    }
    
    /**
     * @inheritDoc
     */
    public function uninstall(InstalledRepositoryInterface $repo, PackageInterface $package) {
        if (!$repo->hasPackage($package)) {
            throw new \InvalidArgumentException('Package is not installed: ' . $package);
        }
        $promise = $this->removeCode($package);
        if (!$promise instanceof PromiseInterface) {
            $promise = \React\Promise\resolve(null);
        }
        $binaryInstaller = $this->binaryInstaller;
        $downloadPath = $this->getPackageBasePath($package);
        $filesystem = $this->filesystem;
        return $promise->then(static function () use ($binaryInstaller, $filesystem, $downloadPath, $package, $repo) : void {
            $binaryInstaller->removeBinaries($package);
            $repo->removePackage($package);
            if (strpos($package->getName(), '/')) {
                $packageVendorDir = dirname($downloadPath);
                if (is_dir($packageVendorDir) && $filesystem->isDirEmpty($packageVendorDir)) {
                    Silencer::call('rmdir', $packageVendorDir);
                }
            }
        });
    }
    
    /**
     * @inheritDoc
     *
     * @return string
     */
    public function getInstallPath(PackageInterface $package) {
        $this->initializeVendorDir();
        $basePath = ($this->vendorDir ? $this->vendorDir . '/' : '') . $package->getPrettyName();
        $targetDir = $package->getTargetDir();
        return $basePath . ($targetDir ? '/' . $targetDir : '');
    }
    
    /**
     * Make sure binaries are installed for a given package.
     *
     * @param PackageInterface $package Package instance
     */
    public function ensureBinariesPresence(PackageInterface $package) {
        $this->binaryInstaller
            ->installBinaries($package, $this->getInstallPath($package), false);
    }
    
    /**
     * Returns the base path of the package without target-dir path
     *
     * It is used for BC as getInstallPath tends to be overridden by
     * installer plugins but not getPackageBasePath
     *
     * @return string
     */
    protected function getPackageBasePath(PackageInterface $package) {
        $installPath = $this->getInstallPath($package);
        $targetDir = $package->getTargetDir();
        if ($targetDir) {
            return Preg::replace('{/*' . str_replace('/', '/+', preg_quote($targetDir)) . '/?$}', '', $installPath);
        }
        return $installPath;
    }
    
    /**
     * @return PromiseInterface|null
     * @phpstan-return PromiseInterface<void|null>|null
     */
    protected function installCode(PackageInterface $package) {
        $downloadPath = $this->getInstallPath($package);
        return $this->getDownloadManager()
            ->install($package, $downloadPath);
    }
    
    /**
     * @return PromiseInterface|null
     * @phpstan-return PromiseInterface<void|null>|null
     */
    protected function updateCode(PackageInterface $initial, PackageInterface $target) {
        $initialDownloadPath = $this->getInstallPath($initial);
        $targetDownloadPath = $this->getInstallPath($target);
        if ($targetDownloadPath !== $initialDownloadPath) {
            // if the target and initial dirs intersect, we force a remove + install
            // to avoid the rename wiping the target dir as part of the initial dir cleanup
            if (strpos($initialDownloadPath, $targetDownloadPath) === 0 || strpos($targetDownloadPath, $initialDownloadPath) === 0) {
                $promise = $this->removeCode($initial);
                if (!$promise instanceof PromiseInterface) {
                    $promise = \React\Promise\resolve(null);
                }
                return $promise->then(function () use ($target) : PromiseInterface {
                    $promise = $this->installCode($target);
                    if ($promise instanceof PromiseInterface) {
                        return $promise;
                    }
                    return \React\Promise\resolve(null);
                });
            }
            $this->filesystem
                ->rename($initialDownloadPath, $targetDownloadPath);
        }
        return $this->getDownloadManager()
            ->update($initial, $target, $targetDownloadPath);
    }
    
    /**
     * @return PromiseInterface|null
     * @phpstan-return PromiseInterface<void|null>|null
     */
    protected function removeCode(PackageInterface $package) {
        $downloadPath = $this->getPackageBasePath($package);
        return $this->getDownloadManager()
            ->remove($package, $downloadPath);
    }
    
    /**
     * @return void
     */
    protected function initializeVendorDir() {
        $this->filesystem
            ->ensureDirectoryExists($this->vendorDir);
        $this->vendorDir = realpath($this->vendorDir);
    }
    protected function getDownloadManager() : DownloadManager {
        assert($this->downloadManager instanceof DownloadManager, new \LogicException(self::class . ' should be initialized with a fully loaded Composer instance to be able to install/... packages'));
        return $this->downloadManager;
    }

}