class MetapackageInstaller

class MetapackageInstaller implements InstallerInterface {
    
    /** @var IOInterface */
    private $io;
    public function __construct(IOInterface $io) {
        $this->io = $io;
    }
    
    /**
     * @inheritDoc
     */
    public function supports(string $packageType) {
        return $packageType === 'metapackage';
    }
    
    /**
     * @inheritDoc
     */
    public function isInstalled(InstalledRepositoryInterface $repo, PackageInterface $package) {
        return $repo->hasPackage($package);
    }
    
    /**
     * @inheritDoc
     */
    public function download(PackageInterface $package, ?PackageInterface $prevPackage = null) {
        // noop
        return \React\Promise\resolve(null);
    }
    
    /**
     * @inheritDoc
     */
    public function prepare($type, PackageInterface $package, ?PackageInterface $prevPackage = null) {
        // noop
        return \React\Promise\resolve(null);
    }
    
    /**
     * @inheritDoc
     */
    public function cleanup($type, PackageInterface $package, ?PackageInterface $prevPackage = null) {
        // noop
        return \React\Promise\resolve(null);
    }
    
    /**
     * @inheritDoc
     */
    public function install(InstalledRepositoryInterface $repo, PackageInterface $package) {
        $this->io
            ->writeError("  - " . InstallOperation::format($package));
        $repo->addPackage(clone $package);
        return \React\Promise\resolve(null);
    }
    
    /**
     * @inheritDoc
     */
    public function update(InstalledRepositoryInterface $repo, PackageInterface $initial, PackageInterface $target) {
        if (!$repo->hasPackage($initial)) {
            throw new \InvalidArgumentException('Package is not installed: ' . $initial);
        }
        $this->io
            ->writeError("  - " . UpdateOperation::format($initial, $target));
        $repo->removePackage($initial);
        $repo->addPackage(clone $target);
        return \React\Promise\resolve(null);
    }
    
    /**
     * @inheritDoc
     */
    public function uninstall(InstalledRepositoryInterface $repo, PackageInterface $package) {
        if (!$repo->hasPackage($package)) {
            throw new \InvalidArgumentException('Package is not installed: ' . $package);
        }
        $this->io
            ->writeError("  - " . UninstallOperation::format($package));
        $repo->removePackage($package);
        return \React\Promise\resolve(null);
    }
    
    /**
     * @inheritDoc
     *
     * @return null
     */
    public function getInstallPath(PackageInterface $package) {
        return null;
    }

}