<?php

/**
 * @file
 * Contains social_post_twitter.module.
 *
 * @noinspection PhpUnusedParameterInspection
 */

use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Url;
use Drupal\Core\Session\AccountInterface;

/**
 * Implements hook_entity_extra_field_info().
 */
function social_post_twitter_entity_extra_field_info() {
  $fields['user']['user']['form']['social_post_twitter'] = [
    'label' => t('Social Post Twitter'),
    'description' => t('Social Post Twitter form element.'),
    'weight' => 5,
  ];
  return $fields;
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function social_post_twitter_form_user_form_alter(&$form, FormStateInterface $form_state, $form_id) {

  // If the for is the user edit form, not user register form or others.
  // @see https://www.drupal.org/node/2854977
  if ($form_id == 'user_form') {
    $current_user = Drupal::currentUser();

    if (_social_post_twitter_can_grant_permission($current_user)) {
      // Add a button to authorize twitter autoposting.
      try {
        $form += _social_post_twitter_user_edit_form($current_user);
      }
      catch (Exception $e) {
        watchdog_exception('social_post_twitter', $e);
      }
    }
  }
}

/**
 * Check if the user is allowed to grant permission for autoposting.
 *
 * @param \Drupal\Core\Session\AccountInterface $current_user
 *   The current user.
 *
 * @return bool
 *   The user can or cannot allow tweeting on the user's behalf.
 */
function _social_post_twitter_can_grant_permission(AccountInterface $current_user): bool {
  $routeMatch = Drupal::service('current_route_match');

  // If the current user has permission to autopost and its id is the same as
  // the user id of parameter.
  if ($current_user->hasPermission('perform twitter autoposting tasks')
    && $current_user->id() == $routeMatch->getParameter('user')->id()) {
    return TRUE;
  }

  return FALSE;
}

/**
 * Creates elements to the user edit form.
 *
 * @param \Drupal\Core\Session\AccountInterface $current_user
 *   The current user.
 *
 * @return array
 *   The elements to add to the user edit form.
 *
 * @throws \Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException
 * @throws \Drupal\Component\Plugin\Exception\PluginNotFoundException
 */
function _social_post_twitter_user_edit_form(AccountInterface $current_user): array {
  /** @var \Drupal\social_post\Entity\SocialPost[] $accounts */
  $accounts = _social_post_twitter_get_accounts_by_uid($current_user->id());

  $form['social_post_twitter'] = [
    '#type' => 'details',
    '#title' => t('Social Post Twitter'),
    '#open' => TRUE,
  ];
  $form['social_post_twitter']['accounts'] = [
    '#type' => 'table',
    '#header' => [t('Screen name'), t('Operations')],
    '#empty' => t('You have not added any accounts yet.'),
  ];

  foreach ($accounts as $id => $account) {
    $form['social_post_twitter']['accounts'][$id]['screen_name'] = [
      '#type' => 'link',
      '#title' => $account->getName(),
      '#url' => Url::fromUri('https://twitter.com/i/user/' . $account->getProviderUserId()),
    ];
    $form['social_post_twitter']['accounts'][$id]['operations'] = [
      '#type' => 'operations',
      '#links' => [
        'delete' => [
          'title' => t('Delete'),
          'url' => Url::fromRoute('entity.social_post.delete_form',
            [
              'provider' => 'twitter',
              'social_post' => $account->getId(),
              'user' => $current_user->id(),
            ]
          ),
        ],
      ],
    ];
  }

  $form['social_post_twitter']['button'] = [
    '#type' => 'link',
    '#title' => t("Add account"),
    '#attributes' => [
      'class' => ['button'],
    ],
    '#url' => Url::fromRoute('social_post_twitter.redirect'),
  ];

  return $form;
}

/**
 * Gets the accounts associated to the Drupal user.
 *
 * @param int $user_id
 *   The user id.
 *
 * @return \Drupal\Core\Entity\EntityInterface[]
 *   Accounts associated to the user id.
 *
 * @throws \Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException
 * @throws \Drupal\Component\Plugin\Exception\PluginNotFoundException
 */
function _social_post_twitter_get_accounts_by_uid(int $user_id): array {
  return Drupal::entityTypeManager()->getStorage('social_post')->loadByProperties([
    'user_id' => $user_id,
    'plugin_id' => 'social_post_twitter',
  ]);
}