<?php

namespace Drupalharlib_newsletter_signupForm;

use DrupalCoreFormFormBase;
use DrupalCoreFormFormStateInterface;

/**
 * Class NewsletterSignup.
 */
class NewsletterSignup extends FormBase {

  public $uniqueIdentifier = 'no_tagline';

  /**
   * {@inheritdoc}
   */
  public function getFormId() {
    return 'newsletter_signup_' . $this->uniqueIdentifier;
  }

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

    if ($this->uniqueIdentifier == "with_tagline") {
      $show_tagline = TRUE;
    }
    else {
      $show_tagline = FALSE;
    }

    $wrapper = 'ajax-wrapper-' . $this->uniqueIdentifier;

    $form['#prefix'] = '<section class="hl__single-input-form"><div id="' . $wrapper . '">';
    $form['#suffix'] = '</div></section>';

    $form['#attributes']['class'][] = 'hl__single-input-form__form';
    $form['#attributes']['novalidate'] = 'novalidate';

    $form['title'] = [
      '#type' => 'label',
      '#for' => 'edit-email-address',
      '#title' => 'Stay in the know',
      '#attributes' => [
        'class' => [
          'hl__label',
          'hl__label--inline',
        ],
      ],
    ];

    if ($show_tagline) {
      $form['tagline'] = [
        '#markup' => '<div class="hl__single-input-form__helper-text">Sign up for email updates from MySite</div>',
      ];
    }

    $errors = $form_state->getErrors();

    if ($errors = $form_state->getErrors()) {
      $form['errors'] = [
        '#markup' => $errors['email_address'],
      ];
    }

    $form['email_address'] = [
      '#type' => 'email',
      '#size' => NULL,
      '#required' => TRUE,
      '#attributes' => [
        'placeholder' => $this->t('Email'),
        'class' => [
          'hl__input',
          'hl__input--inline',
          'js-is-required',
        ],
        'data-twig-suggestion' => 'newsletter_signup_email',
      ],
      '#prefix' => '<div class="hl__single-input-form__input-group">',
    ];

    $form['submit'] = [
      '#type' => 'button',
      '#value' => $this->t('Sign up'),
      '#submit' => ['::submitForm'],
      '#attributes' => [
        'class' => [
          'hl__button',
          'hl__button--small',
          'hl__button--inline',
        ],
        'data-twig-suggestion' => 'newsletter_signup_submit',
      ],
      '#suffix' => '</div>',
      '#ajax' => [
        'wrapper' => $wrapper,
        'method' => 'replace',
        'callback' => '::ajaxRebuildForm',
        'progress' => [
          '#type' => 'none',
        ],
      ],
    ];

    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function validateForm(array &$form, FormStateInterface $form_state) {
    $email_value = $form_state->getValue('email_address');

    if (empty($email_value) || !Drupal::service('email.validator')->isValid($email_value)) {
      $form_state->setError($form['email_address'], $this->t('Please enter a valid email address.'));
    }

    if (mailchimp_is_subscribed('XXXXXXX', $email_value, TRUE)) {
      $form_state->setError($form['email_address'], $this->t('You are already subscribed to our newsletter.'));
    }
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    $result = mailchimp_subscribe('c7d23910fe', $form_state->getValue('email_address'));

    if (empty($result)) {
      $form_state->setError($form['email_address'], $this->t('You are already subscribed to our newsletter.'));
    }
    else {
      drupal_set_message($this->t('Thank you for subscribing to our newsletter!'));
    }
  }

  public function ajaxRebuildForm(array $form, FormStateInterface $formState) {
    return $form;
  }

}