<?php

/**
 * @file
 * Charts - Module.
 */

use Drupal\views\ViewExecutable;

/**
 * Implements hook_views_data().
 */
function charts_views_data() {
  $data['charts_fields']['table']['group'] = t('Charts');
  $data['charts_fields']['table']['join'] = [
    // Exist in all views.
    '#global' => [],
  ];
  $data['charts_fields']['field_charts_fields_scatter'] = [
    'title' => t('Scatter Field'),
    'help' => t('Use this field for your data field in a scatter plot.'),
    'field' => [
      'id' => 'field_charts_fields_scatter',
    ],
  ];
  $data['charts_fields']['field_charts_fields_bubble'] = [
    'title' => t('Bubble Field'),
    'help' => t('Use this field for your data field in a bubble chart.'),
    'field' => [
      'id' => 'field_charts_fields_bubble',
    ],
  ];
  $data['charts_fields']['field_exposed_chart_type'] = [
    'title' => t('Exposed Chart Type'),
    'help' => t('Use this field for exposing chart type.'),
    'field' => [
      'id' => 'field_exposed_chart_type',
    ],
  ];

  return $data;
}

/**
 * Implements hook_theme().
 */
function charts_theme($existing, $type, $theme, $path) {
  return [
    'charts_chart' => [
      'render element' => 'element',
    ],
  ];
}

/**
 * Implements hook_preprocess_HOOK().
 */
function template_preprocess_charts_chart(&$variables) {
  $element = $variables['element'];

  $attributes = $element['#attributes'];
  $attributes['id'] = $element['#id'];
  $attributes['class'][] = 'chart';

  $variables['content'] = [
    '#type' => 'html_tag',
    '#tag' => 'div',
    '#attributes' => $attributes,
    '#value' => $element['#chart'] ?? '',
  ];
  $variables['content_prefix'] = $element['#content_prefix'];
  $variables['content_suffix'] = $element['#content_suffix'];
  $config = \Drupal::config('charts.settings');
  $variables['debug'] = [];
  if (!empty($config->get('advanced.debug'))) {
    $variables['debug'] = [
      '#type' => 'details',
      '#title' => t('Chart JSON'),
      '#open' => FALSE,
      '#attributes' => [
        'data-charts-debug-container' => TRUE,
      ],
      '#collapsible' => TRUE,
      'json' => [
        '#prefix' => '<pre class="language-json">',
        '#type' => 'html_tag',
        '#tag' => 'code',
        '#attributes' => [
          'class' => ['language-json'],
        ],
        '#value' => t('If this is blank, your library will need to implement code in your JavaScript. Please see the README.md.'),
        '#suffix' => '</pre>',
      ],
    ];
  }
}

/**
 * Implements hook_views_pre_view().
 */
function charts_views_pre_view(ViewExecutable $view, $display_id, array &$args) {
  $hasFields = array_key_exists('fields', $view->display_handler->options);
  if ($hasFields) {
    $fields = $view->display_handler->getOption('fields');
    $hasViewsFieldsOnOffHandler = FALSE;
    foreach ($fields as $field) {
      if (array_key_exists('plugin_id', $field)) {

        if ($field['plugin_id'] == 'field_exposed_chart_type') {
          $hasViewsFieldsOnOffHandler = TRUE;
        }
      }
    }
    if ($hasViewsFieldsOnOffHandler) {
      // Grab the type that has been submitted.
      $params = \Drupal::request()->query->all();
      // This is for a GET request.
      // If the view is submitted through AJAX, like in view preview, it will be
      // a POST request. Merge the parameter arrays and we will get our values.
      $postParams = \Drupal::request()->request->all();
      $params = array_merge($params, $postParams);
      foreach ($params as $key => $value) {
        if (strpos($key, 'ct') === 0) {
          $view->storage->set('exposed_chart_type', $value);
        }
      }
      $view->element['#cache']['contexts'][] = 'url';
    }
  }
}

/**
 * Implements hook_library_info_alter().
 *
 * Adapted from webform_library_info_alter() to add CDN support.
 */
function charts_library_info_alter(&$libraries, $extension) {
  // Only process for charts_* modules.
  if (strpos($extension, 'charts_') !== 0) {
    return;
  }

  // Only try to apply cdn changes if the cdn requirements is on.
  $config = \Drupal::config('charts.settings');
  if (!$config->get('advanced.requirements.cdn')) {
    return;
  }

  foreach ($libraries as &$library) {
    if (isset($library['cdn']) && is_array($library['cdn'])) {
      _charts_library_info_alter_recursive($library, $library['cdn']);
    }
  }
}

/**
 * Recursive through a charts library.
 *
 * @param array $library
 *   A library defined in a chart module.
 * @param array $cdn
 *   A associative array of library paths mapped to CDN URL.
 *
 * @note copied from _webform_library_info_alter_recursive().
 */
function _charts_library_info_alter_recursive(array &$library, array $cdn) {
  foreach ($library as $key => &$value) {
    // CSS and JS files and listed in associative arrays keyed via string.
    if (!is_string($key) || !is_array($value)) {
      continue;
    }

    // Ignore the CDN's associative array.
    if ($key === 'cdn') {
      continue;
    }

    // Replace the CDN sources (i.e. /library/*) with the CDN URL destination
    // (https://cdnjs.cloudflare.com/ajax/libs/*).
    foreach ($cdn as $source => $destination) {
      if (_charts_library_check_source_exists($source)) {
        continue;
      }
      if (strpos($key, $source) === 0) {
        $uri = str_replace($source, $destination, $key);
        $library[$uri] = $value;
        $library[$uri]['type'] = 'external';
        unset($library[$key]);
        break;
      }
    }

    // Recurse downward to find nested libraries.
    _charts_library_info_alter_recursive($value, $cdn);
  }
}

/**
 * Checks whether a library source directory or file exists locally.
 *
 * @param string $source
 *   The source directory or file.
 *
 * @return bool
 *   True when the file exist, FALSE otherwise.
 */
function _charts_library_check_source_exists(string $source) {
  $source = rtrim($source, '/');

  $container = \Drupal::getContainer();
  $app_root = $container->getParameter('app.root');
  $site_path = $container->getParameter('site.path');

  // The following logic is taken from libraries_get_libraries()
  $search_dir = [];
  $search_dir[] = $app_root;
  // Similar to 'modules' and 'themes' directories inside an installation
  // profile, installation profiles may want to place libraries into a
  // 'libraries' directory.
  $search_dir[] = 'profiles/' . \Drupal::installProfile();
  // Also search sites/<domain>/*.
  $search_dir[] = $site_path;

  foreach ($search_dir as $dir) {
    if (file_exists($dir . $source) || file_exists($dir . $source)) {
      return TRUE;
    }
  }
  return FALSE;
}