";print_r($block->getPluginId());die();
  
  // This will automatically be saved in the third party settings.

  $form['breadcrumb_background_image']['#tree'] = TRUE;
  $form['third_party_settings']['#tree'] = TRUE;
  //Add fields for breadcrumb
 // print \Drupal::config('gaviasthemer.settings')->get('breadcrumb_background_image_path_' . $_id);
  
  if($block->getPluginId() == 'system_breadcrumb_block'){
    
    $form['breadcrumb_background_image']['file_upload'] = array(
      '#type' => 'file',
      '#title' => t('Breadcrumb | Background Image'),
      '#description' => t('Upload a file, allowed extensions: jpg, jpeg, png, gif')
    );

    $form['third_party_settings']['gaviasthemer']['breadcrumb_background_image_path'] = array(
      '#type' => 'textfield',
      '#title' => t('Breadcrumb | Background Image Path'),
      '#default_value' => \Drupal::config('gaviasthemer.settings')->get('breadcrumb_background_image_path_' . $_id)
    );

    $form['third_party_settings']['gaviasthemer']['breadcrumb_background_color'] = array(
      '#type' => 'textfield',
      '#title' => t('Breadcrumb | Background Color'),
      '#description' => t('Setting background color for breadcrumb. eg: #f5f5f5;'),
      '#default_value' => $block->getThirdPartySetting('gaviasthemer', 'breadcrumb_background_color'),
    );

    $form['third_party_settings']['gaviasthemer']['breadcrumb_background_position'] = array(
      '#type' => 'select',
      '#title' => t('Breadcrumb | Background Position'),
      '#description' => t('Setting background position for breadcrumb.'),
      '#options' => array(
        'center top'        => t('center top'),
        'center right'      => t('center right'),
        'center bottom'     => t('center bottom'),
        'center center'     => t('center center'),
        'left top'          => t('left top'),
        'left center'       => t('left center'),
        'left bottom'       => t('left bottom'),
        'right top'         => t('right top'),
        'right center'      => t('right center'),
        'right bottom'      => t('right bottom')
      ),
      '#default_value' => $block->getThirdPartySetting('gaviasthemer', 'breadcrumb_background_position'),
    );

    $form['third_party_settings']['gaviasthemer']['breadcrumb_background_repeat'] = array(
      '#type' => 'select',
      '#title' => t('Breadcrumb | Background Repeat'),
      '#description' => t('Setting background pepeat for breadcrumb.'),
      '#options' => array(
        'no-repeat'         => t('no-repeat'),
        'repeat'            => t('repeat'),
        'repeat-x'          => t('repeat-x'),
        'repeat-y'          => t('repeat-y')
      ),
      '#default_value' => $block->getThirdPartySetting('gaviasthemer', 'breadcrumb_background_repeat'),
    );

    $form['third_party_settings']['gaviasthemer']['breadcrumb_color_style'] = array(
      '#type' => 'select',
      '#title' => t('Breadcrumb | Color Style'),
      '#description' => t('Setting color style for breadcrumb.'),
      '#options' => array(
        'text-dark'          => t('Text dark'),
        'text-light'         => t('Text light')
      ), 
      '#default_value' => $block->getThirdPartySetting('gaviasthemer', 'breadcrumb_color_style'),
    );

  }

  $form['third_party_settings']['gaviasthemer']['classes'] = array(
    '#type' => 'textfield',
    '#title' => t('CSS class(es)'),
    '#description' => t('Customize the styling of this block by adding CSS classes. Separate multiple classes by spaces.'),
    '#default_value' => $block->getThirdPartySetting('gaviasthemer', 'classes'),
  );

    $form['actions']['submit']['#submit'][] = 'gaviasthemer_form_block_form_submit';
    $form['#validate'][] = 'gaviasthemer_form_block_form_validate';
}

 function gaviasthemer_form_block_form_validate(array &$form, FormStateInterface $form_state) {
   
  $block = $form_state->getFormObject()->getEntity();
  $values = $form_state->getValues();
   
  if($block->getPluginId() == 'system_breadcrumb_block'){

      if (\Drupal::moduleHandler()->moduleExists('file')) {
        // Handle file uploads.
        $validators = array('file_validate_is_image' => array());

        // Check for a new uploaded logo.
        $file = file_save_upload('breadcrumb_background_image', $validators, FALSE, 0);
        if (isset($file)) {
          // File upload was attempted.
          if ($file) {
            // Put the temporary file in form_values so we can save it on submit.
            $form_state->setValue('breadcrumb_background_image_tmp', $file);
          }
          else {
            // File upload failed.
            $form_state->setValue('breadcrumb_background_image_tmp', '');
            $form_state->setErrorByName('breadcrumb_background_image_error', $this->t('The logo could not be uploaded.'));
          }
        }
        $validators = array('file_validate_extensions' => array('ico png gif jpg jpeg apng svg'));
      }
    }
  }

  function gaviasthemer_form_block_form_submit(array &$form, FormStateInterface &$form_state) {
    $block = $form_state->getFormObject()->getEntity();
    $_id = $block->ID();

    if($block->getPluginId() == 'system_breadcrumb_block'){
      $values = $form_state->getValues();
      if( isset($values['breadcrumb_background_image_tmp']) && !empty($values['breadcrumb_background_image_tmp']) ) {
        //$filename = \Drupal::service('file_system')->copy($values['breadcrumb_background_image_tmp']->getFileUri(), 'public://breadcrumb-image', FileSystemInterface::EXISTS_REPLACE);
        $filename = \Drupal::service('file_system')->copy($values['breadcrumb_background_image_tmp']->getFileUri(), 'public://breadcrumb-' . $values['breadcrumb_background_image_tmp']->getFileName(), FileSystemInterface::EXISTS_RENAME);
        if (!empty($filename)) {
          \Drupal::configFactory()->getEditable('gaviasthemer.settings')
          ->set('breadcrumb_background_image_path_' . $_id, gaviasthemer_validate_path($filename))
          ->save();
        }
      }
    }
  }    

 function gaviasthemer_validate_path($path) {
  // Absolute local file paths are invalid.
  if (\Drupal::service('file_system')->realpath($path) == $path) {
    return FALSE;
  }
  // A path relative to the Drupal root or a fully qualified URI is valid.
  if (is_file($path)) {
    return $path;
  }
  // Prepend 'public://' for relative file paths within public filesystem.
  if (file_uri_scheme($path) === FALSE) {
    $path = 'public://' . $path;
  }
  if (is_file($path)) {
    return $path;
  }
  return FALSE;
}

/**
 * Implements hook_preprocess_HOOK().
 */
function gaviasthemer_preprocess_block(&$variables) {
  // Blocks coming from page manager widget does not have id.
  if (isset($variables['elements']['#id']) && !empty($variables['elements']['#id'])) {
    $block = Block::load($variables['elements']['#id']);
    if($block && $classes = $block->getThirdPartySetting('gaviasthemer', 'classes')) {
      $variables['attributes']['class'][] = $classes;
    }
  }
}



function gaviasthemer_writecache( $folder, $file, $value, $e='css' ){
  $file   = $folder  . preg_replace('/[^A-Z0-9\._-]/i', '', $file).'.'.$e ;
  $handle = fopen($file, 'w+');
    fwrite($handle, ($value));
    fclose($handle);
}

/**
* Implements hook_entity_view_alter().
*/
function gaviasthemer_entity_view_alter(array &$build, Drupal\Core\Entity\EntityInterface $entity, \Drupal\Core\Entity\Display\EntityViewDisplayInterface $display) {
  // Cheking view_mode for node.
  if ($build['#view_mode'] === 'full' && $entity Instanceof \Drupal\node\NodeInterface) {
    // Cheking html_head_link on attached tags in head.
    if (!isset($build['#attached']['html_head_link'])) return;
    // Array to unset.
    $gaviasthemer = [
      'delete-form',
      'edit-form',
      'version-history',
      'revision'
    ];
    // Unset loop.
    foreach ($build['#attached']['html_head_link'] as $key => $value) {
      if (isset($value[0]['rel']) && in_array($value[0]['rel'], $gaviasthemer)) unset($build['#attached']['html_head_link'][$key]);
    }
  }
}

/**
 * Implements hook_page_attachments_alter().
 */
function gaviasthemer_page_attachments_alter(array &$attachments) {
  // Array to unset.
  $gaviasthemer = [
    'delete-form',
    'edit-form',
    'version-history',
    'revision'
  ];
  // Unset loop.
  if(isset($attachments['#attached']['html_head_link']) && is_array($attachments['#attached']['html_head_link'])){
    foreach ($attachments['#attached']['html_head_link'] as $key => $value) {
      if (isset($value[0]['rel']) && in_array($value[0]['rel'], $gaviasthemer)) unset($attachments['#attached']['html_head_link'][$key]);
    }
  }
}

/**
 * Implements hook_module_implements_alter().
 */
function gaviasthemer_module_implements_alter(&$implementations, $hook) {
  if ($hook === 'page_attachments_alter') {
    $group = $implementations['gaviasthemer'];
    unset($implementations['gaviasthemer']);
    $implementations['gaviasthemer'] = $group;
  }
}

function gaviasthemer_update_projects_alter(&$projects){
   unset($projects['gaviasthemer']);
   unset($projects['Gaviasthemer']);
}