class ProjectRelease

final class ProjectRelease {
    
    /**
     * Whether the release is compatible with the site's Drupal core version.
     *
     * @var bool
     */
    private $coreCompatible;
    
    /**
     * The core compatibility message or NULL if not set.
     *
     * @var string|null
     */
    private $coreCompatibilityMessage;
    
    /**
     * The download URL or NULL if none is available.
     *
     * @var string|null
     */
    private $downloadUrl;
    
    /**
     * The URL for the release.
     *
     * @var string
     */
    private $releaseUrl;
    
    /**
     * The release types or NULL if not set.
     *
     * @var string[]|null
     */
    private $releaseTypes;
    
    /**
     * Whether the release is published.
     *
     * @var bool
     */
    private $published;
    
    /**
     * The release version.
     *
     * @var string
     */
    private $version;
    
    /**
     * The release date as a Unix timestamp or NULL if no date was set.
     *
     * @var int|null
     */
    private $date;
    
    /**
     * Constructs a ProjectRelease object.
     *
     * @param bool $published
     *   Whether the release is published.
     * @param string $version
     *   The release version.
     * @param string $release_url
     *   The URL for the release.
     * @param string[]|null $release_types
     *   The release types or NULL if not set.
     * @param bool|null $core_compatible
     *   Whether the release is compatible with the site's version of Drupal core.
     * @param string|null $core_compatibility_message
     *   The core compatibility message or NULL if not set.
     * @param string|null $download_url
     *   The download URL or NULL if not available.
     * @param int|null $date
     *   The release date in Unix timestamp format.
     */
    private function __construct(bool $published, string $version, string $release_url, ?array $release_types, ?bool $core_compatible, ?string $core_compatibility_message, ?string $download_url, ?int $date) {
        $this->published = $published;
        $this->version = $version;
        $this->releaseUrl = $release_url;
        $this->releaseTypes = $release_types;
        $this->coreCompatible = $core_compatible;
        $this->coreCompatibilityMessage = $core_compatibility_message;
        $this->downloadUrl = $download_url;
        $this->date = $date;
    }
    
    /**
     * Creates a ProjectRelease instance from an array.
     *
     * @param array $release_data
     *   The project release data as returned by update_get_available().
     *
     * @return \Drupal\update\ProjectRelease
     *   The ProjectRelease instance.
     *
     * @throws \UnexpectedValueException
     *   Thrown if project release data is not valid.
     *
     * @see \update_get_available()
     */
    public static function createFromArray(array $release_data) : ProjectRelease {
        static::validateReleaseData($release_data);
        return new ProjectRelease($release_data['status'] === 'published', $release_data['version'], $release_data['release_link'], $release_data['terms']['Release type'] ?? NULL, $release_data['core_compatible'] ?? NULL, $release_data['core_compatibility_message'] ?? NULL, $release_data['download_link'] ?? NULL, $release_data['date'] ?? NULL);
    }
    
    /**
     * Validates the project release data.
     *
     * @param array $data
     *   The project release data.
     *
     * @throws \UnexpectedValueException
     *   Thrown if project release data is not valid.
     */
    private static function validateReleaseData(array $data) : void {
        $not_blank_constraints = [
            new Type('string'),
            new NotBlank(),
        ];
        $collection_constraint = new Collection([
            'fields' => [
                'version' => $not_blank_constraints,
                'date' => new Optional([
                    new Type('numeric'),
                ]),
                'core_compatible' => new Optional([
                    new Type('boolean'),
                ]),
                'core_compatibility_message' => new Optional($not_blank_constraints),
                'status' => new Choice([
                    'published',
                    'unpublished',
                ]),
                'download_link' => new Optional($not_blank_constraints),
                'release_link' => $not_blank_constraints,
                'terms' => new Optional([
                    new Type('array'),
                    new Collection([
                        'Release type' => new Optional([
                            new Type('array'),
                        ]),
                    ]),
                ]),
            ],
            'allowExtraFields' => TRUE,
        ]);
        $violations = Validation::createValidator()->validate($data, $collection_constraint);
        if (count($violations)) {
            foreach ($violations as $violation) {
                $violation_messages[] = "Field " . $violation->getPropertyPath() . ": " . $violation->getMessage();
            }
            throw new \UnexpectedValueException('Malformed release data: ' . implode(",\n", $violation_messages));
        }
    }
    
    /**
     * Gets the project version.
     *
     * @return string
     *   The project version.
     */
    public function getVersion() : string {
        return $this->version;
    }
    
    /**
     * Gets the release date if set.
     *
     * @return int|null
     *   The date of the release or null if no date is available.
     */
    public function getDate() : ?int {
        return $this->date;
    }
    
    /**
     * Determines if the release is a security release.
     *
     * @return bool
     *   TRUE if the release is security release, or FALSE otherwise.
     */
    public function isSecurityRelease() : bool {
        return $this->isReleaseType('Security update');
    }
    
    /**
     * Determines if the release is unsupported.
     *
     * @return bool
     *   TRUE if the release is unsupported, or FALSE otherwise.
     */
    public function isUnsupported() : bool {
        return $this->isReleaseType('Unsupported');
    }
    
    /**
     * Determines if the release is insecure.
     *
     * @return bool
     *   TRUE if the release is insecure, or FALSE otherwise.
     */
    public function isInsecure() : bool {
        return $this->isReleaseType('Insecure');
    }
    
    /**
     * Determines if the release is matches a type.
     *
     * @param string $type
     *   The release type.
     *
     * @return bool
     *   TRUE if the release matches the type, or FALSE otherwise.
     */
    private function isReleaseType(string $type) : bool {
        return $this->releaseTypes && in_array($type, $this->releaseTypes, TRUE);
    }
    
    /**
     * Determines if the release is published.
     *
     * @return bool
     *   TRUE if the release is published, or FALSE otherwise.
     */
    public function isPublished() : bool {
        return $this->published;
    }
    
    /**
     * Determines whether release is compatible the site's version of Drupal core.
     *
     * @return bool|null
     *   Whether the release is compatible or NULL if no data is set.
     */
    public function isCoreCompatible() : ?bool {
        return $this->coreCompatible;
    }
    
    /**
     * Gets the core compatibility message for the site's version of Drupal core.
     *
     * @return string|null
     *   The core compatibility message or NULL if none is available.
     */
    public function getCoreCompatibilityMessage() : ?string {
        return $this->coreCompatibilityMessage;
    }
    
    /**
     * Gets the download URL of the release.
     *
     * @return string|null
     *   The download URL or NULL if none is available.
     */
    public function getDownloadUrl() : ?string {
        return $this->downloadUrl;
    }
    
    /**
     * Gets the URL of the release.
     *
     * @return string
     *   The URL of the release.
     */
    public function getReleaseUrl() : string {
        return $this->releaseUrl;
    }

}