<?php

/**
 * @file
 * Functions to support theming in the Olives theme.
 */

use Drupal\olives\OlivesPreRender;
use Drupal\Component\Utility\Html;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Template\Attribute;
use Drupal\Core\Render\Element;
use Drupal\user\UserInterface;

/**
 * Implements hook_preprocess_HOOK() for HTML document templates.
 *
 * Adds body classes if certain regions have content.
 */
function olives_preprocess_html(&$variables) {
  if (theme_get_setting('mobile_menu_all_widths') === 1) {
    $variables['attributes']['class'][] = 'is-always-mobile-nav';
  }

  // Convert custom hex to hsl so we can use the hue value
  $brand_color_hex = theme_get_setting('base_primary_color') ?? '#1b9ae4';
  [$h, $s, $l] = _olives_hex_to_hsl($brand_color_hex);

  $variables['html_attributes']->setAttribute('style', "--color--primary-hue:$h;--color--primary-saturation:$s%;--color--primary-lightness:$l");

  // So fonts can be preloaded from base theme in the event Olives is used as a subtheme.
  $variables['olives_path'] = \Drupal::request()->getBasePath() . '/' . \Drupal::service('extension.list.theme')->getPath('olives');

  $query_string = \Drupal::state()->get('system.css_js_query_string') ?: '0';

  // Create render array with noscript tag to output non-JavaScript
  // stylesheet for primary menu.
  $variables['noscript_styles'] = [
    '#type' => 'html_tag',
    '#noscript' => TRUE,
    '#tag' => 'link',
    '#attributes' => [
      'rel' => 'stylesheet',
      'href' => $variables['olives_path'] . '/css/components/navigation/nav-primary-no-js.css?' . $query_string,
    ],
  ];
}

/**
 * Implements hook_preprocess_HOOK() for page title templates.
 */
function olives_preprocess_page_title(&$variables) {
  // Since the title and the shortcut link are both block level elements,
  // positioning them next to each other is much simpler with a wrapper div.
  if (!empty($variables['title_suffix']['add_or_remove_shortcut']) && $variables['title']) {
    // Add a wrapper div using the title_prefix and title_suffix render
    // elements.
    $variables['title_prefix']['shortcut_wrapper'] = [
      '#markup' => '<div class="shortcut-wrapper">',
      '#weight' => 100,
    ];
    $variables['title_suffix']['shortcut_wrapper'] = [
      '#markup' => '</div>',
      '#weight' => -99,
    ];

    // Make sure the shortcut link is the first item in title_suffix.
    $variables['title_suffix']['add_or_remove_shortcut']['#weight'] = -100;
  }

  // Unset shortcut link on front page.
  $variables['is_front'] = \Drupal::service('path.matcher')->isFrontPage();
  if ($variables['is_front'] === TRUE) {
    unset($variables['title_suffix']['add_or_remove_shortcut']);
  }
}

/**
 * Implements hook_preprocess_HOOK() for maintenance-page.html.twig.
 */
function olives_preprocess_maintenance_page(&$variables) {
  // By default, site_name is set to Drupal if no db connection is available
  // or during site installation. Setting site_name to an empty string makes
  // the site and update pages look cleaner.
  // @see template_preprocess_maintenance_page
  if (!$variables['db_is_active']) {
    $variables['site_name'] = '';
  }

  // Olives has custom styling for the maintenance page.
  $variables['#attached']['library'][] = 'olives/maintenance-page';
}

/**
 * Implements hook_preprocess_HOOK() for node.html.twig.
 */
function olives_preprocess_node(&$variables) {
  // Remove the "Add new comment" link on teasers or when the comment form is
  // displayed on the page.
  if ($variables['teaser'] || !empty($variables['content']['comments']['comment_form'])) {
    unset($variables['content']['links']['comment']['#links']['comment-add']);
  }

  // Apply custom date formatter to "date" field.
  if (!empty($variables['date']) && !empty($variables['display_submitted']) && $variables['display_submitted'] === TRUE) {
    $variables['date'] = \Drupal::service('date.formatter')->format($variables['node']->getCreatedTime(), 'olives_medium');
  }

  // Pass layout variable to template if content type is article in full view
  // mode. This is then used in the template to create a BEM style CSS class to
  // control the layout.
  if ($variables['node']->bundle() === 'article' && $variables['view_mode'] === 'full') {
    $variables['layout'] = 'content-narrow';
  }
}

/**
 * Implements hook_preprocess_HOOK() for block.html.twig.
 */
function olives_preprocess_block(&$variables) {
  if (!empty($variables['elements']['#id'])) {
    /** @var \Drupal\block\BlockInterface $block */
    $block = \Drupal::entityTypeManager()
      ->getStorage('block')
      ->load($variables['elements']['#id']);
    if ($block) {
      $region = $block->getRegion();

      if ($variables['base_plugin_id'] === 'system_menu_block') {
        $variables['content']['#attributes']['region'] = $region;
        if ($region === 'sidebar') {
          $variables['#attached']['library'][] = 'olives/menu-sidebar';
        }
      }

      if ($variables['base_plugin_id'] === 'search_form_block') {
        if ($region === 'primary_menu') {
          $variables['#attached']['library'][] = 'olives/search-narrow';
          $variables['content']['actions']['submit']['#theme_wrappers'] = ['input__submit__header_search'];
        }
        elseif ($region === 'secondary_menu') {
          $variables['#attached']['library'][] = 'olives/search-wide';
          $variables['content']['actions']['submit']['#theme_wrappers'] = ['input__submit__header_search'];
        }
      }
    }
  }

  if ($variables['plugin_id'] === 'system_branding_block') {
    $site_branding_color = theme_get_setting('site_branding_bg_color');
    if ($site_branding_color && $site_branding_color !== 'default') {
      $variables['attributes']['class'][] = 'site-branding--bg-' . $site_branding_color;
    }
  }

  // Add a primary-nav class to main menu navigation block.
  if ($variables['plugin_id'] === 'system_menu_block:main') {
    $variables['attributes']['class'][] = 'primary-nav';
  }
}

/**
 * Implements hook_theme_suggestions_HOOK_alter() for menu.
 */
function olives_theme_suggestions_menu_alter(&$suggestions, array $variables) {
  if (isset($variables['attributes']['region'])) {
    $suggestions[] = 'menu__' . $variables['attributes']['region'];
  }
}

/**
 * Implements hook_preprocess_HOOK().
 */
function olives_preprocess_menu(&$variables) {
  if (isset($variables['attributes']['region'])) {
    if ($variables['attributes']['region'] === 'sidebar') {
      $variables['attributes']['class'][] = 'menu--sidebar';
    }
    unset($variables['attributes']['region']);
  }
}

/**
 * Implements hook_theme_suggestions_HOOK_alter() for form templates.
 */
function olives_theme_suggestions_form_alter(array &$suggestions, array $variables) {
  if ($variables['element']['#form_id'] === 'search_block_form') {
    $suggestions[] = 'form__search_block_form';
  }
}

/**
 * Implements hook_form_alter() for adding classes and placeholder text to the search forms.
 */
function olives_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  if (isset($form['actions']['submit']) && (count($form['actions'])) <= 2) {
    $form['actions']['submit']['#attributes']['class'][] = 'button--primary';
  }

  switch ($form_id) {
    case 'search_block_form':
      // Add placeholder text to keys input.
      $form['keys']['#attributes']['placeholder'] = t('Search by keyword or phrase.');

      // Add classes to the search form submit input.
      $form['actions']['submit']['#attributes']['class'][] = 'search-form__submit';
      break;

    case 'search_form':
      $form['basic']['keys']['#attributes']['placeholder'] = t('Search by keyword or phrase.');
      $form['basic']['submit']['#attributes']['class'][] = 'button--primary';
      $form['advanced']['submit']['#attributes']['class'][] = 'button--primary';
      break;
  }
}

/**
 * Implements hook_theme_suggestions_HOOK_alter() for block().
 */
function olives_theme_suggestions_block_alter(&$suggestions, array $variables) {
  if (!empty($variables['elements']['#id'])) {

    /** @var \Drupal\block\BlockInterface $block */
    $block = \Drupal::entityTypeManager()
      ->getStorage('block')
      ->load($variables['elements']['#id']);
    if ($block) {

      // Add region-specific block theme suggestions.
      $region = $block
        ->getRegion();

      $suggestions[] = 'block__' . $region;
      $suggestions[] = 'block__' . $region . '__' . 'plugin_id' . '__' . $variables['elements']['#plugin_id'];
      $suggestions[] = 'block__' . $region . '__' . 'id' . '__' . $variables['elements']['#id'];
    }
  }
}

/**
 * Implements hook_preprocess_HOOK() for menu-local-tasks templates.
 */
function olives_preprocess_menu_local_tasks(&$variables) {
  foreach (Element::children($variables['primary']) as $key) {
    $variables['primary'][$key]['#level'] = 'primary';
  }
  foreach (Element::children($variables['secondary']) as $key) {
    $variables['secondary'][$key]['#level'] = 'secondary';
  }
}

/**
 * Implements hook_preprocess_form_element().
 */
function olives_preprocess_form_element(&$variables) {
  if (in_array($variables['element']['#type'] ?? FALSE, ['checkbox', 'radio'], TRUE)) {
    $variables['attributes']['class'][] = 'form-type-boolean';
  }

  if (!empty($variables['description']['attributes'])) {
    $variables['description']['attributes']->addClass('form-item__description');
  }

  if ($variables['disabled']) {
    $variables['label']['#attributes']['class'][] = 'is-disabled';
  }
}

/**
 * Implements hook_preprocess_HOOK().
 */
function olives_preprocess_form_element_label(&$variables) {
  $variables['attributes']['class'][] = 'form-item__label';
}

/**
 * Implements hook_preprocess_HOOK().
 */
function olives_preprocess_input(&$variables) {
  if (
    !empty($variables['element']['#title_display']) &&
    $variables['element']['#title_display'] === 'attribute' &&
    !empty((string) $variables['element']['#title'])
  ) {
    $variables['attributes']['title'] = (string) $variables['element']['#title'];
  }

  $type_api = $variables['element']['#type'];
  $type_html = $variables['attributes']['type'];
  $text_types_html = [
    'text',
    'email',
    'tel',
    'number',
    'search',
    'password',
    'date',
    'time',
    'file',
    'color',
    'datetime-local',
    'url',
    'month',
    'week',
  ];

  if (in_array($type_html, $text_types_html, TRUE)) {
    $variables['attributes']['class'][] = 'form-element';
    $variables['attributes']['class'][] = Html::getClass('form-element--type-' . $type_html);
    $variables['attributes']['class'][] = Html::getClass('form-element--api-' . $type_api);

    // This logic is functioning as expected, but there is nothing in the theme that renders the result.
    // As a result it can't currently be covered by a functional test.
    if (!empty($variables['element']['#autocomplete_route_name'])) {
      $variables['autocomplete_message'] = t('Loading…');
    }
  }

  if (in_array($type_html, ['checkbox', 'radio'], TRUE)) {
    $variables['attributes']['class'][] = 'form-boolean';
    $variables['attributes']['class'][] = Html::getClass('form-boolean--type-' . $type_html);
  }
}

/**
 * Implements hook_preprocess_HOOK().
 */
function olives_preprocess_textarea(&$variables) {
  $variables['attributes']['class'][] = 'form-element';
  $variables['attributes']['class'][] = 'form-element--type-textarea';
  $variables['attributes']['class'][] = 'form-element--api-textarea';
}

/**
 * Implements hook_preprocess_HOOK().
 */
function olives_preprocess_select(&$variables) {
  $variables['attributes']['class'][] = 'form-element';
  $variables['attributes']['class'][] = $variables['element']['#multiple'] ?
    'form-element--type-select-multiple' :
    'form-element--type-select';
}

/**
 * Implements hook_preprocess_HOOK().
 */
function olives_preprocess_checkboxes(&$variables) {
  $variables['attributes']['class'][] = 'form-boolean-group';
}

/**
 * Implements hook_preprocess_HOOK().
 */
function olives_preprocess_radios(&$variables) {
  $variables['attributes']['class'][] = 'form-boolean-group';
}

/**
 * Implements hook_preprocess_HOOK().
 */
function olives_preprocess_field(&$variables) {
  $rich_field_types = ['text_with_summary', 'text', 'text_long'];

  if (in_array($variables['field_type'], $rich_field_types, TRUE)) {
    $variables['attributes']['class'][] = 'text-content';
  }

  if ($variables['field_type'] == 'image' && $variables['element']['#view_mode'] == 'full' && !$variables["element"]["#is_multiple"] && $variables['field_name'] !== 'user_picture') {
    $variables['attributes']['class'][] = 'wide-image';
  }
}

/**
 * Implements hook_preprocess_HOOK().
 */
function olives_preprocess_field_multiple_value_form(&$variables) {
  // Make disabled available for the template.
  $variables['disabled'] = !empty($variables['element']['#disabled']);

  if (!empty($variables['multiple'])) {
    // Add an additional CSS class for the field label table cell.
    // This repeats the logic of template_preprocess_field_multiple_value_form()
    // without using '#prefix' and '#suffix' for the wrapper element.
    //
    // If the field is multiple, we don't have to check the existence of the
    // table header cell.
    //
    // @see template_preprocess_field_multiple_value_form().
    $header_attributes = ['class' => ['form-item__label', 'form-item__label--multiple-value-form']];
    if (!empty($variables['element']['#required'])) {
      $header_attributes['class'][] = 'js-form-required';
      $header_attributes['class'][] = 'form-required';
    }
    // Using array_key_first() for addressing the first header cell would be
    // more elegant here, but we can rely on the related theme.inc preprocess.
    // @todo change this after https://www.drupal.org/node/3099026 has landed.
    $variables['table']['#header'][0]['data'] = [
      '#type' => 'html_tag',
      '#tag' => 'h4',
      '#value' => $variables['element']['#title'],
      '#attributes' => $header_attributes,
    ];

    if ($variables['disabled']) {
      $variables['table']['#attributes']['class'][] = 'tabledrag-disabled';
      $variables['table']['#attributes']['class'][] = 'js-tabledrag-disabled';

      // We will add the 'is-disabled' CSS class to the disabled table header
      // cells.
      $header_attributes['class'][] = 'is-disabled';
      foreach ($variables['table']['#header'] as &$cell) {
        if (is_array($cell) && isset($cell['data'])) {
          $cell = $cell + ['class' => []];
          $cell['class'][] = 'is-disabled';
        }
        else {
          // We have to modify the structure of this header cell.
          $cell = [
            'data' => $cell,
            'class' => ['is-disabled'],
          ];
        }
      }
    }
  }
}

/**
 * Implements hook_preprocess_HOOK() for menu-local-task templates.
 */
function olives_preprocess_menu_local_task(&$variables) {
  $variables['link']['#options']['attributes']['class'][] = 'tabs__link';
  $variables['link']['#options']['attributes']['class'][] = 'js-tabs-link';

  // Ensure is-active class is set when the tab is active. The generic active
  // link handler applies stricter comparison rules than what is necessary for
  // tabs.
  if (isset($variables['is_active']) && $variables['is_active'] === TRUE) {
    $variables['link']['#options']['attributes']['class'][] = 'is-active';
  }

  if (isset($variables['element']['#level'])) {
    $variables['level'] = $variables['element']['#level'];
  }
}

/**
 * Implements template_preprocess_HOOK() for fieldset.
 */
function olives_preprocess_fieldset(&$variables) {
  $element = $variables['element'];
  $composite_types = ['checkboxes', 'radios'];

  if (!empty($element['#type']) && in_array($element['#type'], $composite_types) && !empty($variables['element']['#children_errors'])) {
    $variables['legend_span']['attributes']->addClass('has-error');
  }

  if (!empty($element['#disabled'])) {
    $variables['legend_span']['attributes']->addClass('is-disabled');

    if (!empty($variables['description']) && !empty($variables['description']['attributes'])) {
      $variables['description']['attributes']->addClass('is-disabled');
    }
  }

  // Remove 'container-inline' class from the main attributes and add a flag
  // instead.
  // @todo remove this after https://www.drupal.org/node/3059593 has been
  //   resolved.
  if (!empty($variables['attributes']['class'])) {
    $container_inline_key = array_search('container-inline', $variables['attributes']['class']);

    if ($container_inline_key !== FALSE) {
      unset($variables['attributes']['class'][$container_inline_key]);
      $variables['inline_items'] = TRUE;
    }
  }
}

/**
 * Implements hook_theme_suggestions_HOOK_alter().
 */
function olives_theme_suggestions_user_alter(&$suggestions, $variables) {
  $suggestions[] = 'user__' . $variables['elements']['#view_mode'];
}

/**
 * Implements hook_preprocess_HOOK().
 */
function olives_preprocess_field__node__created(&$variables) {
  foreach (Element::children($variables['items']) as $item) {
    unset($variables['items'][$item]['content']['#prefix']);
  }
}

/**
 * Implements hook_preprocess_HOOK() for setting classes.
 */
function olives_preprocess_filter_caption(&$variables) {
  $variables['classes'] = isset($variables['classes']) && !empty($variables['classes']) ? $variables['classes'] . ' caption' : 'caption';
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function olives_form_node_preview_form_select_alter(&$form, FormStateInterface $form_state, $form_id) {
  $form['backlink']['#options']['attributes']['class'][] = 'button';
  $form['backlink']['#options']['attributes']['class'][] = 'button--small';
  $form['backlink']['#options']['attributes']['class'][] = 'button--icon-back';
  $form['backlink']['#options']['attributes']['class'][] = 'button--primary';
  $form['view_mode']['#attributes']['class'][] = 'form-element--small';
}

/**
 * Implements hook_preprocess_HOOK() for comment.html.twig.
 */
function olives_preprocess_comment(&$variables) {
  // Getting the node creation time stamp from the comment object.
  $date = $variables['comment']->getCreatedTime();
  // Formatting "created" as "X days ago".
  $variables['created'] = t('@time ago', ['@time' => \Drupal::service('date.formatter')->formatInterval(\Drupal::time()->getRequestTime() - $date)]);
}

/**
 * Implements hook_preprocess_HOOK() for field--comment.html.twig.
 */
function olives_preprocess_field__comment(&$variables) {
  // Add a comment_count.
  $variables['comment_count'] = count(array_filter($variables['comments'], 'is_numeric', ARRAY_FILTER_USE_KEY));

  // Add user.compact to field-comment if profile's avatar of current user
  // exist.
  $user = \Drupal::currentUser();
  if ($user->isAuthenticated() && $user instanceof UserInterface) {
    if ($user->hasField('user_picture') && !$user->get('user_picture')->isEmpty()) {
      $variables['user_picture'] = \Drupal::entityTypeManager()
        ->getViewBuilder('user')
        ->view($user, 'compact');
    }

    $variables['#cache']['contexts'][] = 'user';
  }
}

/**
 * Implements hook_element_info_alter().
 */
function olives_element_info_alter(&$info) {
  if (array_key_exists('text_format', $info)) {
    $info['text_format']['#pre_render'][] = [OlivesPreRender::class, 'textFormat'];
  }

  if (isset($info['status_messages'])) {
    $info['status_messages']['#pre_render'][] = [OlivesPreRender::class, 'messagePlaceholder'];
  }
}

/**
 * Implements template_preprocess_text_format_wrapper().
 *
 * @todo Remove when https://www.drupal.org/node/3016343 is fixed.
 */
function olives_preprocess_text_format_wrapper(&$variables) {
  $description_attributes = [];
  if (!empty($variables['attributes']['id'])) {
    $description_attributes['id'] = $variables['attributes']['aria-describedby'] = $variables['attributes']['id'];
    unset($variables['attributes']['id']);
  }
  $variables['description_attributes'] = new Attribute($description_attributes);
}

/**
 * Implements hook_preprocess_search_result().
 */
function olives_preprocess_search_result(&$variables) {
  // Apply custom date formatter to "date" field.
  if (!empty($variables['result']['date'])) {
    $variables['info_date'] = \Drupal::service('date.formatter')->format($variables['result']['node']->getCreatedTime(), 'olives_medium');
  }
}

/**
 * Implements hook_preprocess_links__comment().
 */
function olives_preprocess_links__comment(&$variables) {
  foreach ($variables['links'] as &$link) {
    $link['link']['#options']['attributes']['class'][] = 'comment__links-link';
  }
}

/**
 * Implements hook_preprocess_table().
 */
function olives_preprocess_table(&$variables) {
  // Mark the whole table and the first cells if rows are draggable.
  if (!empty($variables['rows'])) {
    $draggable_row_found = FALSE;
    foreach ($variables['rows'] as &$row) {
      /** @var \Drupal\Core\Template\Attribute $row['attributes'] */
      if (!empty($row['attributes']) && $row['attributes']->hasClass('draggable')) {
        if (!$draggable_row_found) {
          $variables['attributes']['class'][] = 'draggable-table';
          $draggable_row_found = TRUE;
        }
      }
    }
  }
}

/**
 * Implements hook_form_views_exposed_form_alter().
 */
function olives_form_views_exposed_form_alter(&$form) {
  $form['#attributes']['class'][] = 'form--inline';
}

/**
 * Converts hex color strings to array of HSL values.
 *
 * @param string $hex_string
 *   The 6-character hexadecimal color code, optionally with a leading hash
 *
 * @return array
 *   Array containing hue, saturation, and lightness values.
 *   $hue: integer of value 0-360 indicating the hue on a color wheel.
 *   $saturation: string of saturation as a percentage (0% all gray, 100% full color).
 *   $lightness: string of lightness as a percentage (0% darkened to black, 50% full color, 100% lightened to white).
 *
 * @see https://css-tricks.com/converting-color-spaces-in-javascript
 *   Code based on JS version.
 * @see https://www.rapidtables.com/convert/color/rgb-to-hsl.html
 *   Mathematical formula for rgb-to-hsl conversion.
 *
 * @internal
 */
function _olives_hex_to_hsl(string $hex_string) {
  // Convert hexcode pairs to rgb values (0-255).
  $hex_val = trim($hex_string, '#');
  $r0 = hexdec($hex_val[0] . $hex_val[1]);
  $g0 = hexdec($hex_val[2] . $hex_val[3]);
  $b0 = hexdec($hex_val[4] . $hex_val[5]);

  // Convert rgb's 0-255 to decimal values.
  $r = fdiv($r0, 255);
  $g = fdiv($g0, 255);
  $b = fdiv($b0, 255);

  // Calculate Hue.
  $c_min = min($r, $g, $b);
  $c_max = max($r, $g, $b);
  $delta = $c_max - $c_min;

  if ($delta == 0) {
    $h = 0;
  }
  else {
    switch ($c_max) {
      case $r:
        $h = fmod((($g - $b) / $delta), 6);
        break;

      case $g:
        $h = (($b - $r) / $delta) + 2;
        break;

      case $b:
        $h = (($r - $g) / $delta) + 4;
        break;

      default:
        $h = 0;
        break;
    }
  }

  $h = round($h * 60);

  // Shift hue range from [-60 - 300] to [0 - 360].
  if ($h < 0) {
    $h += 360;
  }

  // Calculate Lightness.
  $l = ($c_max + $c_min) / 2;

  // Calculate Saturation.
  $s = $delta == 0 ? 0 : $delta / (1 - abs((2 * $l) - 1));

  // Convert Saturation and Lightness to percentages.
  $s = round($s * 100);
  $l = round($l * 100);

  return [$h, $s, $l];
}