<?php


namespace Drupal\dds_sendgrid\Form;


use Drupal\Core\Config\ConfigFactoryInterface;
use Drupal\Core\Extension\ModuleHandlerInterface;
use Drupal\Core\Form\ConfigFormBase;
use Drupal\Core\Form\FormStateInterface;
use SendGrid\Mail\Content;
use SendGrid\Mail\From;
use SendGrid\Mail\Mail;
use SendGrid\Mail\Personalization;
use SendGrid\Mail\Subject;
use SendGrid\Mail\Substitution;
use SendGrid\Mail\To;
use Symfony\Component\DependencyInjection\ContainerInterface;

class SettingsForm extends ConfigFormBase {

  /**
   * The module handler service.
   *
   * @var \Drupal\Core\Extension\ModuleHandlerInterface
   */
  protected $moduleHandler;

  /**
   * Constructs a \Drupal\system\ConfigFormBase object.
   *
   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
   *   The factory for configuration objects.
   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
   *   The module handler service.
   */
  public function __construct(ConfigFactoryInterface $config_factory, ModuleHandlerInterface $module_handler) {
    parent::__construct($config_factory);
    $this->moduleHandler = $module_handler;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static(
      $container->get('config.factory'),
      $container->get('module_handler')
    );
  }


  /**
   * {@inheritdoc}
   */
  protected function getEditableConfigNames() {
    return ['dds_sendgrid.settings'];
  }

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

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) {
    $config = $this->config('dds_sendgrid.settings');

    $form['authentication'] = [
      '#type' => 'fieldset',
      '#title' => $this->t('Authentication'),
    ];

    $form['authentication']['api_key'] = [
      '#type' => 'password',
      '#required' => TRUE,
      '#title' => $this->t('API Secret Key'),
      '#description' => $this->t('The secret key of your key pair. These are only generated once by SendGrid. Your existing key is hidden. If you need to change this, provide a new key here.'),
    ];

    $api_key = $config->get('api_key');
    if (!empty($api_key)) {
      $form['authentication']['api_key']['#required'] = FALSE;
      $form['authentication']['api_key']['#default_value'] = $api_key;
      $form['authentication']['secretkeynotice'] = [
        '#markup' => $this->t('You have saved a secret key. You may change the key by inputting a new one in the field directly below.'),
      ];
    }

    return parent::buildForm($form, $form_state);
  }

  /**
   * {@inheritdoc}
   */
  public function validateForm(array &$form, FormStateInterface $form_state) {
    $config = $this->config('dds_sendgrid.settings');
    // Check for API secret key. If missing throw error.
    if (empty($config->get('api_key')) && empty($form_state->getValue('api_key'))) {
      $form_state->setError($form['authentication']['api_key'], $this->t('You have not stored an API Secret Key.'));
    }

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

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    $config = $this->config('dds_sendgrid.settings');
    $values = $form_state->cleanValues()->getValues();

    if (isset($values['api_key']) && !empty($values['api_key'])) {
      $config->set('api_key', $values['api_key']);
    }
    $config->save();

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

}