Scheduled Ads Drupal settings form.

SampleScheduledAds.php

<?php

namespace Drupal\sample_module\Plugin\Block;

use Drupal\Core\Block\BlockBase;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Config\ConfigFactoryInterface;
use Drupal\sample_module\Form\SampleAdsSettingsForm;

/**
 * Scheduled ads block.
 *
 * @Block(
 * id = "block_sample_module_scheduled_ads",
 * admin_label = @Translation("Scheduled Ads"),
 * category = @Translation("Custom")
 * )
 */
class SampleScheduledAds extends BlockBase implements ContainerFactoryPluginInterface {
  /**
   * Config Factory.
   *
   * @var \Drupal\Core\Config\ConfigFactoryInterface
   */
  protected $configFactory;

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    $static = new static($configuration, $plugin_id, $plugin_definition);
    $static->setConfigFactory($container->get('config.factory'));
    return $static;
  }

  /**
   * Set the config factory.
   *
   * @param \Drupal\Core\Config\ConfigFactoryInterface $configFactory
   *   Config Factory.
   */
  protected function setConfigFactory(ConfigFactoryInterface $configFactory) {
    $this->configFactory = $configFactory;
  }

  /**
   * {@inheritdoc}
   */
  public function blockForm($form, FormStateInterface $form_state) {
    $form = parent::blockForm($form, $form_state);

    // Get block configuration.
    $config = $this->getConfiguration();

    // Get scheduled ads configuration.
    $ads_config = $this->configFactory->getEditable(SampleAdsSettingsForm::SETTINGS);

    $items = $ads_config->get('sample_module.ads.items');
    if (!empty($items)) {
      foreach ($items as $key => $item) {
        $option[$key] = $item['title'];
      }
    }

    $form['scheduled_ad'] = [
      '#type' => 'select',
      '#title' => $this->t('Scheduled ads'),
      '#description' => $this->t('Listing scheduled ads.'),
      '#default_value' => $config['scheduled_ad'],
      '#options' => $option,
      "#empty_option" => $this->t('- Select -'),
      '#required' => TRUE,
    ];

    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function blockSubmit($form, FormStateInterface $form_state) {
    parent::blockSubmit($form, $form_state);
    $values = $form_state->getValues();
    $this->setConfigurationValue('scheduled_ad', $values['scheduled_ad']);
  }

  /**
   * {@inheritdoc}
   */
  public function build() {
    // Get block configuration.
    $config = $this->getConfiguration();

    // Get scheduled ads configuration.
    $ads_config = $this->configFactory->getEditable(SampleAdsSettingsForm::SETTINGS);

    $output = ['#markup' => ''];

    $items = $ads_config->get('sample_module.ads.items');
    $item_index = $config['scheduled_ad'];
    if (!empty($items) && !empty($items[$item_index])) {
      if ($this->isValidAd($items[$item_index])) {
        $output['#markup'] = $items[$item_index]['ads_body'];
      }
    }

    return $output;
  }

  /**
   * Check whether today is weekend or not.
   */
  public function isTodayWeekend() {
    return in_array(date("l"), ["Saturday", "Sunday"]);
  }

  /**
   * Check if the given item is valid.
   *
   * @param array $item
   *   Ad Item.
   */
  public function isValidAd(array $item) {
    if (empty($item['ads_type'])) {
      return FALSE;
    }

    // Check daily, week_days and weekend ads.
    if ($item['ads_type'] === 'daily' || $item['ads_type'] === 'week_days' || $item['ads_type'] === 'weekend_days') {
      if (!empty($item['schedule']['time']['start']) && !empty($item['schedule']['time']['end'])) {
        $starts_on = strtotime($item['schedule']['time']['start']);
        $ends_on = strtotime($item['schedule']['time']['end']);
        $time_now = strtotime(date('h:i:s A'));
        if ($time_now >= $starts_on && $time_now <= $ends_on) {
          if ($item['ads_type'] === 'daily' ||
              ($item['ads_type'] === 'week_days' && !$this->isTodayWeekend()) ||
              ($item['ads_type'] === 'weekend_days' && $this->isTodayWeekend())
             ) {
            return TRUE;
          }
        }
      }
    }

    // Check between dates and custom days.
    if ($item['ads_type'] === 'between_dates' || $item['ads_type'] === 'custom') {
      if (!empty($item['between_dates']['start']) && !empty($item['between_dates']['end'])) {
        $btw_starts_on = strtotime($item['between_dates']['start']);
        $btw_ends_on = strtotime($item['between_dates']['end']);
        $datetime_now = strtotime(date('Y-m-d h:i:s A'));
        if ($datetime_now >= $btw_starts_on && $datetime_now <= $btw_ends_on) {
          if ($item['ads_type'] === 'between_dates') {
            return TRUE;
          }
          elseif ($item['ads_type'] === 'custom') {
            $today = strtolower(date('l'));
            if ($item['dates_fieldset'][$today]['enabled'] === 1) {
              if (!empty($item['dates_fieldset'][$today]['time']['start']) && !empty($item['dates_fieldset'][$today]['time']['end'])) {
                $time_starts_on = strtotime($item['dates_fieldset'][$today]['time']['start']);
                $time_ends_on = strtotime($item['dates_fieldset'][$today]['time']['end']);
                $time_now = strtotime(date('h:i:s A'));
                if ($time_now >= $time_starts_on && $time_now <= $time_ends_on) {
                  return TRUE;
                }
              }

            }
          }
        }
      }
    }

    return FALSE;
  }

}

scheduled_ads.php

<?php

namespace Drupal\sample_module\Form;

use Drupal\Core\Form\ConfigFormBase;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Datetime\DrupalDateTime;

/**
 * Configure Sample ads settings.
 */
class SampleAdsSettingsForm extends ConfigFormBase {

  /**
   * Config settings.
   *
   * @var string
   */
  const SETTINGS = 'sample_module.ads.settings';

  /**
   * {@inheritdoc}
   */
  public function getFormId() {
    return 'sample_module_admin_ads_settings';
  }

  /**
   * {@inheritdoc}
   */
  protected function getEditableConfigNames() {
    return [
      static::SETTINGS,
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) {
    $config = $this->configFactory->getEditable(static::SETTINGS);
    $days = [
      'monday' => 'Monday',
      'tuesday' => 'Tuesday',
      'wednesday' => 'Wednesday',
      'thursday' => 'Thursday',
      'friday' => 'Friday',
      'saturday' => 'Saturday',
      'sunday' => 'Sunday',
    ];

    $item_indexes = $form_state->get('item_indexes');

    if (empty($item_indexes)) {
      $item_indexes = ['item_' . time()];
      $items = $config->get('sample_module.ads.items');
      if (!empty($items)) {
        $item_indexes = array_keys($items);
      }
      $form_state->set('item_indexes', $item_indexes);
    }

    $form['#tree'] = TRUE;

    $form['items'] = [
      '#type' => 'container',
      '#prefix' => '<div id="items-row-wrapper">',
      '#suffix' => '</div>',
    ];

    $i = 1;
    foreach ($item_indexes as $index) {
      $settings_key = 'sample_module.ads.items.' . $index;
      if ($config->get($settings_key . '.title')) {
        $title = $config->get($settings_key . '.title');
      }
      else {
        $title = $this->t('New Item');
      }
      $form['items'][$index] = [
        '#type' => 'details',
        '#title' => $title,
      ];
      $form['items'][$index]['title'] = [
        '#type' => 'textfield',
        '#title' => $this->t('Title'),
        '#default_value' => $config->get($settings_key . '.title'),
      ];
      $form['items'][$index]['ads_body'] = [
        '#type' => 'textarea',
        '#title' => $this->t('Ads Body'),
        '#default_value' => $config->get($settings_key . '.ads_body'),
      ];

      $form['items'][$index]['ads_type'] = [
        '#type' => 'select',
        '#title' => $this->t('Ads type'),
        '#options' => [
          'daily' => $this->t('Daily'),
          'week_days' => $this->t('Week days'),
          'weekend_days' => $this->t('Weekend days'),
          'between_dates' => $this->t('Between dates'),
          'custom' => $this->t('custom'),
        ],
        "#empty_option" => $this->t('- Select -'),
        '#default_value' => $config->get($settings_key . '.ads_type'),
      ];

      $form['items'][$index]['schedule']['time'] = [
        '#type' => 'container',
        '#attributes' => [
          'class' => [
            'container-inline',
          ],
        ],
        '#states' => [
          'invisible' => [
            ':input[name="items[' . $index . '][ads_type]"]' => [
              ['value' => 'custom'],
              ['value' => 'between_dates'],
            ],
          ],
        ],
      ];
      $form['items'][$index]['schedule']['time']['start'] = [
        '#type' => 'datetime',
        '#title' => $this->t('Starts on'),
        '#title_display' => 'invisible',
        '#date_date_element' => 'none',
      ];
      if ($config->get($settings_key . '.schedule.time.start')) {
        $form['items'][$index]['schedule']['time']['start']['#default_value'] = DrupalDateTime::createFromTimestamp(
          strtotime($config->get($settings_key . '.schedule.time.start')));
      }

      $form['items'][$index]['schedule']['time']['end'] = [
        '#type' => 'datetime',
        '#title' => $this->t('Ends on'),
        '#title_display' => 'invisible',
        '#date_date_element' => 'none',
      ];
      if ($config->get($settings_key . '.schedule.time.end')) {
        $form['items'][$index]['schedule']['time']['end']['#default_value'] = DrupalDateTime::createFromTimestamp(
          strtotime($config->get($settings_key . '.schedule.time.end')));
      }

      $form['items'][$index]['between_dates'] = [
        '#type' => 'container',
        '#attributes' => [
          'class' => [
            'container-inline',
          ],
        ],
        '#states' => [
          'visible' => [
            ':input[name="items[' . $index . '][ads_type]"]' => [
              ['value' => 'custom'],
              ['value' => 'between_dates'],
            ],
          ],
        ],
      ];

      $form['items'][$index]['between_dates']['start'] = [
        '#type' => 'datetime',
        '#title' => $this->t('Starts on'),
        '#title_display' => 'invisible',
      ];
      if ($config->get($settings_key . '.between_dates.start')) {
        $form['items'][$index]['between_dates']['start']['#default_value'] = DrupalDateTime::createFromTimestamp(
          strtotime($config->get($settings_key . '.between_dates.start')));
      }

      $form['items'][$index]['between_dates']['end'] = [
        '#type' => 'datetime',
        '#title' => $this->t('Ends on'),
        '#title_display' => 'invisible',
      ];
      if ($config->get($settings_key . '.between_dates.end')) {
        $form['items'][$index]['between_dates']['end']['#default_value'] = DrupalDateTime::createFromTimestamp(
          strtotime($config->get($settings_key . '.between_dates.end')));
      }

      $form['items'][$index]['dates_fieldset'] = [
        '#type' => 'fieldset',
        '#states' => [
          'visible' => [
            ':input[name="items[' . $index . '][ads_type]"]' => ['value' => 'custom'],
          ],
        ],
      ];

      foreach ($days as $day_index => $day) {
        $day_settings_key = $settings_key . '.dates_fieldset.' . $day_index;

        $form['items'][$index]['dates_fieldset'][$day_index]['enabled'] = [
          '#type' => 'checkbox',
          '#title' => $day,
          '#default_value' => $config->get($day_settings_key . '.enabled'),
        ];

        $form['items'][$index]['dates_fieldset'][$day_index]['time'] = [
          '#type' => 'container',
          '#attributes' => [
            'class' => [
              'container-inline',
            ],
          ],
        ];
        $form['items'][$index]['dates_fieldset'][$day_index]['time']['start'] = [
          '#type' => 'datetime',
          '#title' => $this->t('Starts on'),
          '#title_display' => 'invisible',
          '#date_date_element' => 'none',
        ];
        if ($config->get($day_settings_key . '.time.start')) {
          $form['items'][$index]['dates_fieldset'][$day_index]['time']['start']['#default_value'] = DrupalDateTime::createFromTimestamp(
            strtotime($config->get($day_settings_key . '.time.start')));
        }

        $form['items'][$index]['dates_fieldset'][$day_index]['time']['end'] = [
          '#type' => 'datetime',
          '#title' => $this->t('Ends on'),
          '#title_display' => 'invisible',
          '#date_date_element' => 'none',
        ];
        if ($config->get($day_settings_key . '.time.end')) {
          $form['items'][$index]['dates_fieldset'][$day_index]['time']['end']['#default_value'] = DrupalDateTime::createFromTimestamp(
            strtotime($config->get($day_settings_key . '.time.end')));
        }
      }

      if ($i > 2) {
        $form['items'][$index]['actions']['remove'] = [
          '#type' => 'submit',
          '#value' => $this->t('Remove'),
          '#name' => 'op_remove_' . $index,
          '#submit' => ['::removeCallback'],
          '#limit_validation_errors' => [],
          '#ajax' => [
            'callback' => '::addmoreCallback',
            'wrapper' => 'items-row-wrapper',
          ],
        ];
      }
    }

    $form['actions']['add_row'] = [
      '#type' => 'submit',
      '#value' => $this->t('Add more'),
      '#submit' => ['::addOne'],
      '#limit_validation_errors' => [],
      '#ajax' => [
        'callback' => '::addMoreCallback',
        'wrapper' => 'items-row-wrapper',
      ],
    ];

    $form_state->setCached(FALSE);
    return parent::buildForm($form, $form_state);
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {

    $config = $this->configFactory->getEditable(static::SETTINGS);
    // Remove old settings.
    $config->delete();
    $items = $form_state->getValue('items');

    foreach ($items as $key => $item) {
      $settings_key = 'sample_module.ads.items.' . $key;
      $config->set($settings_key . '.title', $item['title']);
      $config->set($settings_key . '.ads_body', $item['ads_body']);
      $config->set($settings_key . '.ads_type', $item['ads_type']);
      if (!empty($item['schedule']['time']['start'])) {
        $config->set($settings_key . '.schedule.time.start', $item['schedule']['time']['start']->format('h:i:s A'));
      }
      if (!empty($item['schedule']['time']['end'])) {
        $config->set($settings_key . '.schedule.time.end', $item['schedule']['time']['end']->format('h:i:s A'));
      }

      if (!empty($item['between_dates']['start'])) {
        $config->set($settings_key . '.between_dates.start', $item['between_dates']['start']->format('Y-m-d h:i:s A'));
      }
      if (!empty($item['between_dates']['end'])) {
        $config->set($settings_key . '.between_dates.end', $item['between_dates']['end']->format('Y-m-d h:i:s A'));
      }

      if ($item['ads_type'] == 'custom') {
        foreach ($item['dates_fieldset'] as $day_index => $day_item) {
          $day_settings_key = $settings_key . '.dates_fieldset.' . $day_index;
          $config->set($day_settings_key . '.enabled', $day_item['enabled']);

          if (!empty($day_item['time']['start'])) {
            $config->set($day_settings_key . '.time.start', $day_item['time']['start']->format('h:i:s A'));
          }
          if (!empty($day_item['time']['end'])) {
            $config->set($day_settings_key . '.time.end', $day_item['time']['end']->format('h:i:s A'));
          }
        }
      }

    }

    $config->save();

    parent::submitForm($form, $form_state);
  }

  /**
   * Callback for add-more button.
   */
  public function addMoreCallback(array &$form, FormStateInterface $form_state) {
    return $form['items'];
  }

  /**
   * Submit handler for the "add-one-more" button.
   */
  public function addOne(array &$form, FormStateInterface $form_state) {
    $item_indexes = $form_state->get('item_indexes');
    $item_indexes[] = 'item_' . time();
    $form_state->set('item_indexes', $item_indexes);
    $form_state->setRebuild();
  }

  /**
   * Submit handler for the "remove one" button.
   */
  public function removeCallback(array &$form, FormStateInterface $form_state) {
    $item_indexes = $form_state->get('item_indexes');
    $item_index = $form_state->getTriggeringElement()['#parents'][1];

    if (($key = array_search($item_index, $item_indexes)) !== FALSE) {
      unset($item_indexes[$key]);
    }
    $form_state->set('item_indexes', $item_indexes);

    $form_state->setRebuild();
  }

}