class UpdateOperation

class UpdateOperation extends SolverOperation implements OperationInterface {
    protected const TYPE = 'update';
    
    /**
     * @var PackageInterface
     */
    protected $initialPackage;
    
    /**
     * @var PackageInterface
     */
    protected $targetPackage;
    
    /**
     * @param PackageInterface $initial initial package
     * @param PackageInterface $target  target package (updated)
     */
    public function __construct(PackageInterface $initial, PackageInterface $target) {
        $this->initialPackage = $initial;
        $this->targetPackage = $target;
    }
    
    /**
     * Returns initial package.
     */
    public function getInitialPackage() : PackageInterface {
        return $this->initialPackage;
    }
    
    /**
     * Returns target package.
     */
    public function getTargetPackage() : PackageInterface {
        return $this->targetPackage;
    }
    
    /**
     * @inheritDoc
     */
    public function show($lock) : string {
        return self::format($this->initialPackage, $this->targetPackage, $lock);
    }
    public static function format(PackageInterface $initialPackage, PackageInterface $targetPackage, bool $lock = false) : string {
        $fromVersion = $initialPackage->getFullPrettyVersion();
        $toVersion = $targetPackage->getFullPrettyVersion();
        if ($fromVersion === $toVersion && $initialPackage->getSourceReference() !== $targetPackage->getSourceReference()) {
            $fromVersion = $initialPackage->getFullPrettyVersion(true, PackageInterface::DISPLAY_SOURCE_REF);
            $toVersion = $targetPackage->getFullPrettyVersion(true, PackageInterface::DISPLAY_SOURCE_REF);
        }
        elseif ($fromVersion === $toVersion && $initialPackage->getDistReference() !== $targetPackage->getDistReference()) {
            $fromVersion = $initialPackage->getFullPrettyVersion(true, PackageInterface::DISPLAY_DIST_REF);
            $toVersion = $targetPackage->getFullPrettyVersion(true, PackageInterface::DISPLAY_DIST_REF);
        }
        $actionName = VersionParser::isUpgrade($initialPackage->getVersion(), $targetPackage->getVersion()) ? 'Upgrading' : 'Downgrading';
        return $actionName . ' <info>' . $initialPackage->getPrettyName() . '</info> (<comment>' . $fromVersion . '</comment> => <comment>' . $toVersion . '</comment>)';
    }

}