class Time

class Time extends CachePluginBase {
    
    /**
     * {@inheritdoc}
     */
    protected $usesOptions = TRUE;
    
    /**
     * The date formatter service.
     *
     * @var \Drupal\Core\Datetime\DateFormatterInterface
     */
    protected $dateFormatter;
    
    /**
     * Constructs a Time cache plugin object.
     *
     * @param array $configuration
     *   A configuration array containing information about the plugin instance.
     * @param string $plugin_id
     *   The plugin_id for the plugin instance.
     * @param mixed $plugin_definition
     *   The plugin implementation definition.
     * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
     *   The date formatter service.
     * @param \Drupal\Component\Datetime\TimeInterface $time
     *   The time service.
     */
    public function __construct(array $configuration, $plugin_id, $plugin_definition, DateFormatterInterface $date_formatter, TimeInterface $time) {
        parent::__construct($configuration, $plugin_id, $plugin_definition);
        $this->dateFormatter = $date_formatter;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
        return new static($configuration, $plugin_id, $plugin_definition, $container->get('date.formatter'), $container->get('datetime.time'));
    }
    protected function defineOptions() {
        $options = parent::defineOptions();
        $options['results_lifespan'] = [
            'default' => 3600,
        ];
        $options['results_lifespan_custom'] = [
            'default' => 0,
        ];
        $options['output_lifespan'] = [
            'default' => 3600,
        ];
        $options['output_lifespan_custom'] = [
            'default' => 0,
        ];
        return $options;
    }
    public function buildOptionsForm(&$form, FormStateInterface $form_state) {
        parent::buildOptionsForm($form, $form_state);
        $options = [
            60,
            300,
            1800,
            3600,
            21600,
            518400,
        ];
        $options = array_map([
            $this->dateFormatter,
            'formatInterval',
        ], array_combine($options, $options));
        $options = [
            0 => $this->t('Never cache'),
        ] + $options + [
            'custom' => $this->t('Custom'),
        ];
        $form['results_lifespan'] = [
            '#type' => 'select',
            '#title' => $this->t('Query results'),
            '#description' => $this->t('The length of time raw query results should be cached.'),
            '#options' => $options,
            '#default_value' => $this->options['results_lifespan'],
        ];
        $form['results_lifespan_custom'] = [
            '#type' => 'textfield',
            '#title' => $this->t('Seconds'),
            '#size' => '25',
            '#maxlength' => '30',
            '#description' => $this->t('Length of time in seconds raw query results should be cached.'),
            '#default_value' => $this->options['results_lifespan_custom'],
            '#states' => [
                'visible' => [
                    ':input[name="cache_options[results_lifespan]"]' => [
                        'value' => 'custom',
                    ],
                ],
            ],
        ];
        $form['output_lifespan'] = [
            '#type' => 'select',
            '#title' => $this->t('Rendered output'),
            '#description' => $this->t('The length of time rendered HTML output should be cached.'),
            '#options' => $options,
            '#default_value' => $this->options['output_lifespan'],
        ];
        $form['output_lifespan_custom'] = [
            '#type' => 'textfield',
            '#title' => $this->t('Seconds'),
            '#size' => '25',
            '#maxlength' => '30',
            '#description' => $this->t('Length of time in seconds rendered HTML output should be cached.'),
            '#default_value' => $this->options['output_lifespan_custom'],
            '#states' => [
                'visible' => [
                    ':input[name="cache_options[output_lifespan]"]' => [
                        'value' => 'custom',
                    ],
                ],
            ],
        ];
    }
    public function validateOptionsForm(&$form, FormStateInterface $form_state) {
        $custom_fields = [
            'output_lifespan',
            'results_lifespan',
        ];
        foreach ($custom_fields as $field) {
            $cache_options = $form_state->getValue('cache_options');
            if ($cache_options[$field] == 'custom' && !is_numeric($cache_options[$field . '_custom'])) {
                $form_state->setError($form[$field . '_custom'], $this->t('Custom time values must be numeric.'));
            }
        }
    }
    public function summaryTitle() {
        $results_lifespan = $this->getLifespan('results');
        $output_lifespan = $this->getLifespan('output');
        return $this->dateFormatter
            ->formatInterval($results_lifespan, 1) . '/' . $this->dateFormatter
            ->formatInterval($output_lifespan, 1);
    }
    protected function getLifespan($type) {
        $lifespan = $this->options[$type . '_lifespan'] == 'custom' ? $this->options[$type . '_lifespan_custom'] : $this->options[$type . '_lifespan'];
        return $lifespan;
    }
    protected function cacheExpire($type) {
        $lifespan = $this->getLifespan($type);
        if ($lifespan) {
            $cutoff = $this->time
                ->getRequestTime() - $lifespan;
            return $cutoff;
        }
        else {
            return FALSE;
        }
    }
    
    /**
     * {@inheritdoc}
     */
    protected function cacheSetMaxAge($type) {
        $lifespan = $this->getLifespan($type);
        if ($lifespan) {
            return $lifespan;
        }
        else {
            return Cache::PERMANENT;
        }
    }
    
    /**
     * {@inheritdoc}
     */
    protected function getDefaultCacheMaxAge() {
        // The max age, unless overridden by some other piece of the rendered code
        // is determined by the output time setting.
        return (int) $this->cacheSetMaxAge('output');
    }

}