class SecurityAdvisory

final class SecurityAdvisory {
    
    /**
     * The title of the advisory.
     *
     * @var string
     */
    protected $title;
    
    /**
     * The project name for the advisory.
     *
     * @var string
     */
    protected $project;
    
    /**
     * The project type for the advisory.
     *
     * @var string
     */
    protected $type;
    
    /**
     * Whether this advisory is a PSA instead of another type of advisory.
     *
     * @var bool
     */
    protected $isPsa;
    
    /**
     * The currently insecure versions of the project.
     *
     * @var string[]
     */
    protected $insecureVersions;
    
    /**
     * The URL to the advisory.
     *
     * @var string
     */
    protected $url;
    
    /**
     * Constructs a SecurityAdvisories object.
     *
     * @param string $title
     *   The title of the advisory.
     * @param string $project
     *   The project name.
     * @param string $type
     *   The project type.
     * @param bool $is_psa
     *   Whether this advisory is a public service announcement.
     * @param string $url
     *   The URL to the advisory.
     * @param string[] $insecure_versions
     *   The versions of the project that are currently insecure. For public
     *   service announcements this list does not include versions that will be
     *   marked as insecure when the new security release is published.
     */
    private function __construct(string $title, string $project, string $type, bool $is_psa, string $url, array $insecure_versions) {
        $this->title = $title;
        $this->project = $project;
        $this->type = $type;
        $this->isPsa = $is_psa;
        $this->url = $url;
        $this->insecureVersions = $insecure_versions;
    }
    
    /**
     * Creates a SecurityAdvisories instance from an array.
     *
     * @param mixed[] $data
     *   The security advisory data as returned from the JSON feed.
     *
     * @return self
     *   A new SecurityAdvisories object.
     */
    public static function createFromArray(array $data) : self {
        static::validateAdvisoryData($data);
        return new static($data['title'], $data['project'], $data['type'], $data['is_psa'], $data['link'], $data['insecure']);
    }
    
    /**
     * Validates the security advisory data.
     *
     * @param mixed[] $data
     *   The advisory data.
     *
     * @throws \UnexpectedValueException
     *   Thrown if security advisory data is not valid.
     */
    protected static function validateAdvisoryData(array $data) : void {
        $not_blank_constraints = [
            new Type([
                'type' => 'string',
            ]),
            new NotBlank(),
        ];
        $collection_constraint = new Collection([
            'fields' => [
                'title' => $not_blank_constraints,
                'project' => $not_blank_constraints,
                'type' => $not_blank_constraints,
                'link' => $not_blank_constraints,
                'is_psa' => new Choice([
                    'choices' => [
                        1,
                        '1',
                        0,
                        '0',
                        TRUE,
                        FALSE,
                    ],
                ]),
                'insecure' => new Type([
                    'type' => 'array',
                ]),
            ],
            // Allow unknown fields, in the case that new fields are added to JSON
            // feed validation should still pass.
'allowExtraFields' => TRUE,
        ]);
        $violations = Validation::createValidator()->validate($data, $collection_constraint);
        if ($violations->count()) {
            foreach ($violations as $violation) {
                $violation_messages[] = "Field " . $violation->getPropertyPath() . ": " . $violation->getMessage();
            }
            throw new \UnexpectedValueException('Malformed security advisory: ' . implode(",\n", $violation_messages));
        }
    }
    
    /**
     * Gets the title.
     *
     * @return string
     *   The project title.
     */
    public function getTitle() : string {
        return $this->title;
    }
    
    /**
     * Gets the project associated with the advisory.
     *
     * @return string
     *   The project name.
     */
    public function getProject() : string {
        return $this->project;
    }
    
    /**
     * Gets the type of project associated with the advisory.
     *
     * @return string
     *   The project type.
     */
    public function getProjectType() : string {
        return $this->type;
    }
    
    /**
     * Whether the security advisory is for core or not.
     *
     * @return bool
     *   TRUE if the advisory is for core, or FALSE otherwise.
     */
    public function isCoreAdvisory() : bool {
        return $this->getProjectType() === 'core';
    }
    
    /**
     * Whether the security advisory is a public service announcement or not.
     *
     * @return bool
     *   TRUE if the advisory is a public service announcement, or FALSE
     *   otherwise.
     */
    public function isPsa() : bool {
        return $this->isPsa;
    }
    
    /**
     * Gets the currently insecure versions of the project.
     *
     * @return string[]
     *   The versions of the project that are currently insecure.
     */
    public function getInsecureVersions() : array {
        return $this->insecureVersions;
    }
    
    /**
     * Gets the URL to the security advisory.
     *
     * @return string
     *   The URL to the security advisory.
     */
    public function getUrl() : string {
        return $this->url;
    }

}