<?php

namespace Drupal\dds_dynamic_key_value\Plugin\Field\FieldFormatter;

use Drupal\Core\Field\FieldDefinitionInterface;
use Drupal\Core\Field\FieldItemInterface;
use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Field\FormatterBase;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Plugin implementation of the 'key_value' table formatter.
 *
 * @FieldFormatter(
 *   id = "dynamic_key_value_table_formatter",
 *   label = @Translation("Table"),
 *   field_types = {
 *     "yml_config"
 *   }
 * )
 */
class DynamicKeyValueTableFormatter extends FormatterBase {

  /**
   * {@inheritdoc}
   */
  public static function defaultSettings() {
    return [
        'key_label' => t('Key'),
        'value_label' => t('Value'),
        'display_labels' => TRUE,
      ] + parent::defaultSettings();
  }

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

    $elements = [
      'display_labels' => [
        '#type' => 'checkbox',
        '#title' => t('Display labels'),
        '#default_value' => $this->getSetting('display_labels'),
      ],
      'key_label' => [
        '#type' => 'textfield',
        '#title' => t('Key display label'),
        '#default_value' => $this->getSetting('key_label'),
      ],
      'value_label' => [
        '#type' => 'textfield',
        '#title' => t('Value display label'),
        '#default_value' => $this->getSetting('value_label'),
      ],
    ];

    return $elements;
  }

  /**
   * {@inheritdoc}
   */
  public function settingsSummary() {
    $summary = [];

    $summary[] = t('Display Labels: @display', [
      '@display' => $this->getSetting('display_labels')? t('yes') : t('no'),
    ]);
    $summary[] = t('Key Display Label: @key_label', [
      '@key_label' => $this->getSetting('key_label'),
    ]);
    $summary[] = t('Value Display Label: @value_label', [
      '@value_label' => $this->getSetting('value_label'),
    ]);

    return $summary;
  }

  /**
   * {@inheritdoc}
   */
  public function viewElements(FieldItemListInterface $items, $langcode) {
    $key_values = [];
    foreach ($items as $delta => $item) {
      $key_values[] = [
        'key' => $item->key,
        'value' => $item->value,
      ];
    }

    return [
      '#theme' => 'key_value_table',
      '#key_values' => $key_values,
      '#display_labels' => $this->getSetting('display_labels'),
      '#key_label' => $this->getSetting('key_label'),
      '#value_label' => $this->getSetting('value_label'),
    ];
  }
}