<?php

namespace Drupal\reinstall\Plugin\migrate\source;

use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\migrate\MigrateException;
use Drupal\migrate\Plugin\migrate\source\SourcePluginBase;
use Drupal\migrate\Plugin\MigrationInterface;
use Drupal\migrate\Row;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\Yaml\Exception\ParseException;
use Symfony\Component\Yaml\Yaml;

abstract class SimpleSource extends SourcePluginBase implements ContainerFactoryPluginInterface {

  /**
   * The source records.
   *
   * @var array
   */
  protected $records;

  public static function create(
    ContainerInterface $container,
    array $configuration,
    $pluginId,
    $pluginDefinition,
    MigrationInterface $migration = NULL
  ) {
    $importPath = $container->getParameter('reinstall.path');
    $configuration['importPath'] = $importPath;
    return new static($configuration, $pluginId, $pluginDefinition, $migration);
  }

  /**
   * {@inheritdoc}
   */
  public function doCount() {
    return count($this->records);
  }

  /**
   * Flatten a typical Drupal 8 field array to a 1-level array.
   */
  protected function flattenRow(Row $row) {
    $source = $row->getSource();
    foreach ($source as $key => &$item_list) {
      if (is_scalar($item_list)) {
        continue;
      }
      if (count($item_list) > 1) {
        $item = $item_list;
      }
      else {
        $item = reset($item_list);
      }

      if (isset($item['target_id'])) {
        $value = $item['target_id'];
      }
      elseif (is_scalar($item) || (count($item) != 1 && !isset($item['width']) && !isset($item['pid']))) {
        $value = $item;
      }
      elseif (isset($item['value'])) {
        $value = $item['value'];
      }
      // Handle bundle['target_id']
      // Exclude image field to keep metadata (alt / title)
      elseif (isset($item['target_id']) && !isset($item['alt']) && !isset($item['title'])) {
        $value = $item['target_id'];
      }
      elseif (isset($item['pid'])) {
        $value = $item['alias'];
      }
      else {
        $value = $item;
      }

      if (empty($item)) {
        $value = NULL;
      }
      $row->setSourceProperty($key, $value);
    }
  }

  /**
   * {@inheritdoc}
   */
  protected function initializeIterator() {
    return new \ArrayIterator($this->records);
  }

  /**
   * Load then parse the file requested in configuration and return its records.
   *
   * @param array $configuration
   *
   * @param string $key
   *   Optional. A top-level key for the source document. If empty, items will
   *   be parsed from the root of the source document.
   *
   *
   * @return mixed
   *
   * @throws \Drupal\migrate\MigrateException
   */
  protected function initialParse(array $configuration, string $key = NULL) {
    $baseFilePath = $configuration['file'] ?? NULL;
    $importPath = $configuration['importPath'] ?? NULL;
    $filePath = realpath("$importPath/$baseFilePath");
    if (!is_file($filePath) || !is_readable($filePath)) {
      throw new MigrateException("${filePath} is not a readable file.");
    }

    try {
      $raw = file_get_contents($filePath);
      $data = Yaml::parse($raw);
    } catch (ParseException $e) {
      throw new MigrateException("Cannot parse the contents of ${filePath}.");
    }

    if ($key) {
      return $data[$key] ?? [];
    }

    return $data ?? [];
  }

  /**
   * {@inheritdoc}
   */
  public function __toString() {
    $current = $this->getIterator()->current();
    $ret = json_encode($current, JSON_PRETTY_PRINT);
    return $ret;
  }

}