<?php

use Drupal\Component\Serialization\Yaml;

$result = file_scan_directory('.', '/views.view.+yml/');

$filenames = array_keys($result);

$table_entity_map = [
  'node' => 'node',
  'node_field_data' => 'node',
  'node__body' => 'node',
  'node_revision' => 'node',
  'node_search_index' => NULL,
  'node__field_name_0' => 'node',
  'node__field_name_5' => 'node',
  'node_counter' => NULL,
  'history' => NULL,
  'views' => NULL,
  'forum_index' => NULL,
  'comment' => 'comment',
  'comment_field_data' => 'comment',
  'comment__comment_body' => 'comment',
  'comment_entity_statistics' => NULL,
  'watchdog' => NULL,
  'users' => 'user',
  'users_field_data' => 'user',
  'users_roles' => NULL,
  'views_test_data' => NULL,
  'taxonomy_term_data' => 'taxonomy_term',
  'taxonomy_term_field_data' => 'taxonomy_term',
  'taxonomy_index' => NULL,
  'taxonomy_term__field_foo' => 'taxonomy_term',
  'file_managed' => 'file',
  'file_usage' => NULL,
  'entity_test' => 'entity_test',
  'aggregator_feed' => 'aggregator_feed',
  'aggregator_item' => 'aggregator_item',
];

$field_map = [
  'node_field_data:nid' => 'nid',
  'node_field_data:uid' => 'uid',
  'node_field_data:title' => 'title',
  'node_field_data:type' => 'type',
  'node_field_data:status' => 'status',
  'node_field_data:promote' => 'promote',
  'node_field_data:sticky' => 'sticky',
  'node_field_data:created' => 'created',
  'node_field_data:changed' => 'changed',
  'node_field_data:langcode' => 'langcode',
  'node_field_data:uid_touch' => NULL,
  'node_field_data:status_extra' => NULL,
  'node_field_data:uid_revision' => 'uid_revision',

  'node_field_data:created_year_month' => NULL,
  'node_field_data:created_day' => NULL,
  'node_field_data:created_fulldate' => NULL,
  'node_field_data:created_month' => NULL,

  'node__body:body_value' => 'body',
  'node__body:body' => 'body',
  'node__field_name_0:field_name_0' => 'field_name_0',
  'node__field_name_5:field_name_5' => 'field_name_5',

  'node:node_bulk_form' => NULL,
  'node:status' => 'status',
  'node:created' => 'created',
  'node:sticky' => 'sticky',
  'node:nid' => 'nid',
  'node:delete' => NULL,
  'node:node_listing_empty' => NULL,
  'node_revision:nid' => 'nid',
  'node_revision:vid' => 'vid',
  'node:edit_node' => NULL,
  'node:delete_node' => NULL,
  'node:uid_touch_tracker' => NULL,
  'node:path' => NULL,

  'comment_field_data:subject' => 'subject',
  'comment_field_data:status' => 'status',
  'comment_field_data:changed' => 'changed',
  'comment_field_data:created' => 'created',
  'comment__comment_body:comment_body_value' => 'comment_body',
  'comment:cid' => 'cid',

  'users:uid' => 'uid',
  'users:name' => 'name',
  'users:contact' => NULL,
  'users:data' => NULL,
  'users:status' => 'status',
  'users_field_data:name' => 'name',
  'users_field_data:access' => 'access',
  'users_field_data:mail' => 'mail',
  'users_field_data:status' => 'status',
  'users_field_data:created' => 'created',
  'users_field_data:changed' => 'changed',
  'users:user_bulk_form' => NULL,
  'users:edit_node' => NULL,
  // is this right?
  'users:uid_raw' => NULL,
  'users:translation_link' => NULL,

  'taxonomy_term_data:tid' => 'tid',
  'taxonomy_term_data:name' => 'name',
  'taxonomy_term_field_data:name' => 'name',
  'taxonomy_term_field_data:tid' => 'tid',
  'taxonomy_term__field_foo:field_foo_value' => 'field_foo',
  'taxonomy_term_field_data:description__value' => 'description',

  'entity_test:id' => 'id',

  'file_managed:fid' => 'fid',
  'file_managed:filemime' => 'filemime',
  'file_managed:created' => 'created',
  'file_managed:status' => 'status',
  'file_managed:filesize' => 'filesize',
  'file_managed:changed' => 'changed',
  'file_managed:filename' => 'filename',

  'aggregator_item:timestamp' => 'timestamp',
  'aggregator_item:iid' => 'iid',
  'aggregator_item:title' => 'title',
  'aggregator_item:author' => 'author',
  'aggregator_item:description' => 'description',
  'aggregator_feed:fid' => 'fid',
  'aggregator_feed:link' => 'link',
  'aggregator_feed:modified' => 'modified',
  'aggregator_feed:title' => 'title',
  'aggregator_feed:description' => 'description',
  'aggregator_feed:url' => 'url',

  'entity_test:name' => 'name',
];

foreach ($filenames as $filename) {
  $content = file_get_contents($filename);
  $config = Yaml::decode($content);

  convert_single_config($filename, $config, $table_entity_map, $field_map);
}

function convert_single_config($filename, array &$config, array $table_entity_map, array $field_map) {
  foreach ($config['display'] as $display_id => &$display) {
    $handler_types = ['fields', 'filters', 'arguments', 'sorts', 'header', 'footer', 'empty'];
    foreach ($handler_types as $handler_type) {
      if (isset($display['display_options'][$handler_type])) {
        foreach ($display['display_options'][$handler_type] as $id => &$field) {

          if (isset($table_entity_map[$field['table']]) || array_key_exists($field['table'], $table_entity_map)) {
            if ($table_entity_map[$field['table']]) {
              $field['entity_type'] = $table_entity_map[$field['table']];
            }
            else {
              // There is no proper table, lets' continue.
              continue;
            }
          }
          else {
            // We don't know the table, let's continue.
            continue;
          }

          $table_field = $field['table'] . ':' . $field['field'];
          if (isset($field_map[$table_field]) || array_key_exists($table_field, $field_map)) {
            if ($field_map[$table_field]) {
              $field['entity_field'] = $field_map[$table_field];
            }
          }
          else {
            print_r($filename);
            print_r(":");
            print_r($field['table']);
            print_r(":");
            print_r($field['field']);
            print_r("  ");
          }

        }
      }
    }
  }

  file_put_contents($filename, Yaml::encode($config));
}