<?php

declare(strict_types=1);

namespace Drupal\islandora_inplace_media;

use Drupal\Core\File\FileSystemInterface;
use Drupal\file\Entity\File;
use Drupal\media\Entity\Media;
use Drupal\Core\File\FileExists;

/**
 * Utility class for managing media file operations in Islandora.
 */
class Utils {

  /**
   * Processes individual file.
   */
  public static function processMediaBatch($file_name, $build_data, &$context) {
    if (!isset($context['results'])) {
      $context['results'] = [];
    }
    $media_type = $build_data['media_type'];
    $file_type = $build_data['file_type'] ?? 'field_media_file';
    $logger = \Drupal::logger('islandora_inplace_media');
    $fileSystem = \Drupal::service('file_system');
    $source_path = $build_data['source_dir'] . '/' . $file_name;
    $destination_path = $build_data['destination_path'] . '/' . $file_name;

    if (!\file_exists($source_path)) {
      $logger->warning('File does not exist: @file', ['@file' => $source_path]);
      return;
    }
    if ($source_path === $destination_path) {
      $path = $destination_path;
    }
    else {
      $path = $fileSystem->copy($source_path, $destination_path, FileExists::Rename);
    }
    $file = \Drupal::service('file.repository')->loadByUri($path);
    if (!$file) {
      $absolute_path = $fileSystem->realpath($destination_path);
      if ($absolute_path) {
        chown($absolute_path, $build_data['ownership']);
      }

      $file = File::create([
        'uri' => $path,
        'status' => 1,
      ]);
      $file->save();
    }

    $context['results'][$file->id()] = $path;

    if (preg_match('/^(\d+)_/', $file_name, $matches)) {
      $nid = $matches[1] ?? NULL;
    }

    $media = Media::create([
      "bundle" => $media_type,
      "name" => $file_name,
      $file_type => [
        "target_id" => $file->id(),
      ],
      'field_media_use' => [
        "target_id" => $build_data['media_use'],
      ],
      "field_media_of" => $nid,
    ]);
    $media->save();

  }

  /**
   * Builds batch from input directory.
   */
  public static function buildMediaBatch($build_data) {
    $source_dir = $build_data['source_dir'];
    if ($source_dir && !is_dir($source_dir)) {
      \Drupal::logger('islandora_inplace_media')->error('Source directory does not exist: @dir', ['@dir' => $source_dir]);
      return;
    }
    $destination = $build_data['destination_path'];
    $fileSystem = \Drupal::service('file_system');
    $fileSystem->prepareDirectory($destination, FileSystemInterface::CREATE_DIRECTORY);
    chown($destination, $build_data['ownership']);

    $files = scandir($source_dir);
    $files = array_diff($files, ['.', '..']);

    $batch = [
      'title' => t('Processing media files...'),
      'operations' => [],
    // Static method reference.
      'finished' => [self::class, 'finishMediaBatch'],
    ];

    foreach ($files as $file_name) {
      $batch['operations'][] = [
        [self::class, 'processMediaBatch'],
        [$file_name, $build_data],
      ];
    }

    batch_set($batch);
  }

  /**
   * Display results.
   */
  public static function finishMediaBatch($success, $results, $operations) {
    if ($success) {
      \Drupal::logger('islandora_inplace_media')->notice('Successfully processed media files.');
    }
    else {
      \Drupal::logger('islandora_inplace_media')->error('There were errors processing media files.');
    }
  }

}