<?php
namespace EnableMediaReplace;
use \EnableMediaReplace\emrFile as File;
use EnableMediaReplace\ShortPixelLogger\ShortPixelLogger as Log;
use EnableMediaReplace\Notices\NoticeController as Notices;

use EnableMediaReplace\Externals\Elementor as Elementor; // like Skeletor.

class Replacer
{
  protected $post_id;

  // everything source is the attachment being replaced
  protected $sourceFile; // File Object
  protected $source_post; // wpPost;
  protected $source_is_image;
  protected $source_metadata;
  protected $source_url;

  // everything target is what will be. This is set when the image is replace, the result. Used for replacing.
  protected $targetFile;
  protected $targetName;
  protected $target_metadata;
  protected $target_url;

  protected $target_location = false; // option for replacing to another target location

  protected $replaceMode = 1; // replace if nothing is set
  protected $timeMode = 1;
  protected $datetime = null;

  protected $ThumbnailUpdater; // class

  const MODE_REPLACE = 1;
  const MODE_SEARCHREPLACE = 2;

  const TIME_UPDATEALL = 1; // replace the date
  const TIME_UPDATEMODIFIED = 2; // keep the date, update only modified
  const TIME_CUSTOM = 3; // custom time entry

  public function __construct($post_id)
  {
      $this->post_id = $post_id;

      if (function_exists('wp_get_original_image_path')) // WP 5.3+
      {
          $source_file = wp_get_original_image_path($post_id);
          if ($source_file === false) // if it's not an image, returns false, use the old way.
            $source_file = trim(get_attached_file($post_id, apply_filters( 'emr_unfiltered_get_attached_file', true )));
      }
      else
        $source_file = trim(get_attached_file($post_id, apply_filters( 'emr_unfiltered_get_attached_file', true )));

      /* It happens that the SourceFile returns relative / incomplete when something messes up get_upload_dir with an error something.
         This case shoudl be detected here and create a non-relative path anyhow..
      */
      if (! file_exists($source_file) && $source_file && 0 !== strpos( $source_file, '/' ) && ! preg_match( '|^.:\\\|', $source_file ) )
      {
        $file = get_post_meta( $post_id, '_wp_attached_file', true );
        $uploads = wp_get_upload_dir();
        $source_file = $uploads['basedir'] . "/$source_file";
      }

      Log::addDebug('SourceFile ' . $source_file);
      $this->sourceFile = new File($source_file);

      $this->source_post = get_post($post_id);
      $this->source_is_image = wp_attachment_is('image', $this->source_post);
      $this->source_metadata = wp_get_attachment_metadata( $post_id );

      if (function_exists('wp_get_original_image_url')) // WP 5.3+
      {
        $source_url = wp_get_original_image_url($post_id);
        if ($source_url === false)  // not an image, or borked, try the old way
          $source_url = wp_get_attachment_url($post_id);

        $this->source_url = $source_url;
      }
      else
        $this->source_url = wp_get_attachment_url($post_id);
    //  $this->ThumbnailUpdater = new \ThumbnailUpdater($post_id);
      //$this->ThumbnailUpdater->setOldMetadata($this->source_metadata);
  }

  public function setMode($mode)
  {
    $this->replaceMode = $mode;
  }

  public function setTimeMode($mode, $datetime = 0)
  {
    if ($datetime == 0)
      $datetime = current_time('mysql');

    $this->datetime = $datetime;
    $this->timeMode = $mode;
  }

  /** Replace the sourceFile with a target
  * @param $file String Full Path to the Replacement File. This will usually be an uploaded file in /tmp/
  * @param $fileName String The fileName of the uploaded file. This will be used if sourcefile is not to be overwritten.
  * @throws RunTimeException  Can throw exception if something went wrong with the files.
  */
  public function replaceWith($file, $fileName)
  {
      global $wpdb;
      $this->targetName = $fileName;

      $targetFile = $this->getTargetFile();

      if (is_null($targetFile))
      {
        return null;
      //  $ex = __('Target File could not be set. The source file might not be there. In case of search and replace, a filter might prevent this', "enable-media-replace");
      //  throw new \RuntimeException($ex);
      }

      $targetFileObj = new File($targetFile);
      $result = $targetFileObj->checkAndCreateFolder();
      if ($result === false)
        Log::addError('Directory creation for targetFile failed');


      $this->removeCurrent(); // tries to remove the current files.

      /* @todo See if wp_handle_sideload / wp_handle_upload can be more securely used for this */
      $result_moved = move_uploaded_file($file,$targetFile);

      if (false === $result_moved)
      {
        $ex = sprintf( esc_html__('The uploaded file could not be moved to %1$s. This is most likely an issue with permissions, or upload failed.', "enable-media-replace"), $targetFile );
        throw new \RuntimeException($ex);
      }

      // init targetFile.
      $this->targetFile = new File($targetFile);

      if ($this->sourceFile->getPermissions() > 0)
        chmod( $targetFile, $this->sourceFile->getPermissions() ); // restore permissions
      else {
        Log::addWarn('Setting permissions failed');
      }

      // update the file attached. This is required for wp_get_attachment_url to work.
      $updated = update_attached_file($this->post_id, $this->targetFile->getFullFilePath() );
      if (! $updated)
        Log::addError('Update Attached File reports as not updated or same value');

      $this->target_url = $this->getTargetURL(); //wp_get_attachment_url($this->post_id);

      // Run the filter, so other plugins can hook if needed.
      $filtered = apply_filters( 'wp_handle_upload', array(
          'file' => $this->targetFile->getFullFilePath(),
          'url'  => $this->target_url,
          'type' => $this->targetFile->getFileMime(),
      ), 'sideload');

      // check if file changed during filter. Set changed to attached file meta properly.
      if (isset($filtered['file']) && $filtered['file'] != $this->targetFile->getFullFilePath() )
      {
        update_attached_file($this->post_id, $filtered['file'] );
        $this->targetFile = new File($filtered['file']);  // handle as a new file
        Log::addInfo('WP_Handle_upload filter returned different file', $filtered);
      }

			// Check and update post mimetype, otherwise badly coded plugins cry.
		  $post_mime = get_post_mime_type($this->post_id);
			$target_mime = $this->targetFile->getFileMime();

			// update DB post mime type, if somebody decided to mess it up, and the target one is not empty.
			if ($target_mime !== $post_mime && strlen($target_mime) > 0)
			{

				  \wp_update_post(array('post_mime_type' => $this->targetFile->getFileMime(), 'ID' => $this->post_id));
			}

      $metadata = wp_generate_attachment_metadata( $this->post_id, $this->targetFile->getFullFilePath() );
      wp_update_attachment_metadata( $this->post_id, $metadata );
      $this->target_metadata = $metadata;

      /** If author is different from replacer, note this */
      $author_id = get_post_meta($this->post_id, '_emr_replace_author', true);

      if ( intval($this->source_post->post_author) !== get_current_user_id())
      {
         update_post_meta($this->post_id, '_emr_replace_author', get_current_user_id());
      }
      elseif ($author_id)
      {
        delete_post_meta($this->post_id, '_emr_replace_author');
      }

      if ($this->replaceMode == self::MODE_SEARCHREPLACE)
      {
         // Write new image title.
         $title = $this->getNewTitle();
				 $excerpt = $this->getNewExcerpt();
         $update_ar = array('ID' => $this->post_id);
         $update_ar['post_title'] = $title;
         $update_ar['post_name'] = sanitize_title($title);
				 if ($excerpt !== false)
				 {
				 		$update_ar['post_excerpt'] = $excerpt;
				 }
         $update_ar['guid'] = $this->target_url; //wp_get_attachment_url($this->post_id);
    //     $update_ar['post_mime_type'] = $this->targetFile->getFileMime();

         $post_id = \wp_update_post($update_ar, true);

         // update post doesn't update GUID on updates.
         $wpdb->update( $wpdb->posts, array( 'guid' =>  $this->target_url), array('ID' => $this->post_id) );
         //enable-media-replace-upload-done

         // @todo Replace this one with proper Notices:addError;
         if (is_wp_error($post_id))
         {
          $errors = $post_id->get_error_messages();
         foreach ($errors as $error) {
             echo $error;
          }
         }

      }  // SEARCH REPLACE MODE

      $args = array(
          'thumbnails_only' => ($this->replaceMode == self::MODE_SEARCHREPLACE) ? false : true,
      );

      // Search Replace will also update thumbnails.
      $this->doSearchReplace($args);

      /*if(wp_attachment_is_image($this->post_id))
      {
        $this->ThumbnailUpdater->setNewMetadata($this->target_metadata);
        $result = $this->ThumbnailUpdater->updateThumbnails();
        if (false === $result)
          Log::addWarn('Thumbnail Updater returned false');
      }*/


      // if all set and done, update the date.
      // This must be done after wp_update_posts
      $this->updateDate(); // updates the date.

      // Give the caching a kick. Off pending specifics.
      $cache_args = array(
        'flush_mode' => 'post',
        'post_id' => $this->post_id,
      );

      $cache = new emrCache();
      $cache->flushCache($cache_args);

      do_action("enable-media-replace-upload-done", $this->target_url, $this->source_url, $this->post_id);

      return true;
  }

  protected function getNewTitle()
  {
    // get basename without extension
    $title = basename($this->targetFile->getFileName(), '.' . $this->targetFile->getFileExtension());
    $meta = $this->target_metadata;

    if (isset($meta['image_meta']))
    {
      if (isset($meta['image_meta']['title']))
      {
          if (strlen($meta['image_meta']['title']) > 0)
          {
             $title = $meta['image_meta']['title'];
          }
      }
    }

    // Thanks Jonas Lundman   (http://wordpress.org/support/topic/add-filter-hook-suggestion-to)
    $title = apply_filters( 'enable_media_replace_title', $title );

    return $title;
  }

  protected function getNewExcerpt()
  {
	    $meta = $this->target_metadata;
			$excerpt = false;

	    if (isset($meta['image_meta']))
	    {
	      if (isset($meta['image_meta']['caption']))
	      {
	          if (strlen($meta['image_meta']['caption']) > 0)
	          {
	             $excerpt = $meta['image_meta']['caption'];
	          }
	      }
	    }

		return $excerpt;
  }

  /** Gets the source file after processing. Returns a file */
  public function getSourceFile()
  {
     return $this->sourceFile;
  }

  public function setNewTargetLocation($new_rel_location)
  {
      $uploadDir = wp_upload_dir();
      $newPath = trailingslashit($uploadDir['basedir']) . $new_rel_location;

      if (! is_dir($newPath))
      {
        Notices::addError(__('Specificed new directory does not exist. Path must be a relative path from the upload directory and exist', 'enable-media-replace'));
        return false;
      }
      $this->target_location = trailingslashit($newPath);
      return true;
  }

  /** Returns a full target path to place to new file. Including the file name!  **/
  protected function getTargetFile()
  {
    $targetPath = null;
    if ($this->replaceMode == self::MODE_REPLACE)
    {
      $targetFile = $this->sourceFile->getFullFilePath(); // overwrite source
    }
    elseif ($this->replaceMode == self::MODE_SEARCHREPLACE)
    {
        $path = $this->sourceFile->getFilePath();
        if ($this->target_location) // Replace to another path.
        {
           $otherTarget = new File($this->target_location . $this->targetName);
           if ($otherTarget->exists())
           {
              Notices::addError(__('In specificied directory there is already a file with the same name. Can\'t replace.', 'enable-media-replace'));
              return null;
           }
           $path = $this->target_location; // if all went well.
        }
        //if ($this->sourceFile->getFileName() == $this->targetName)
        $targetpath = $path . $this->targetName;

        // If the source and target path AND filename are identical, user has wrong mode, just overwrite the sourceFile.
        if ($targetpath == $this->sourceFile->getFullFilePath())
        {
            $unique = $this->sourceFile->getFileName();
            $this->replaceMode == self::MODE_REPLACE;
        }
        else
        {
            $unique = wp_unique_filename($path, $this->targetName);
        }
        $new_filename = apply_filters( 'emr_unique_filename', $unique, $path, $this->post_id );
        $targetFile = trailingslashit($path) . $new_filename;
    }
    if (is_dir($targetFile)) // this indicates an error with the source.
    {
        Log::addWarn('TargetFile is directory ' . $targetFile );
        $upload_dir = wp_upload_dir();
        if (isset($upload_dir['path']))
        {
          $targetFile = trailingslashit($upload_dir['path']) . wp_unique_filename($targetFile, $this->targetName);
        }
        else {
          $err = __('EMR could not establish a proper destination for replacement', 'enable-media-replace');
          Notices::addError($err);
          Log::addError($err);
        //  throw new \RuntimeException($err);
        //  exit($err); // fallback
          return null;
        }
    }
    return $targetFile;
  }

  /** Since WP functions also can't be trusted here in certain cases, create the URL by ourselves */
  protected function getTargetURL()
  {
    //$uploads['baseurl']
    $url = wp_get_attachment_url($this->post_id);
    $url_basename = basename($url);

    // Seems all worked as normal.
    if (strpos($url, '://') >= 0 && $this->targetFile->getFileName() == $url_basename)
        return $url;

    // Relative path for some reason
    if (strpos($url, '://') === false)
    {
        $uploads = wp_get_upload_dir();
        $url = str_replace($uploads['basedir'], $uploads['baseurl'], $this->targetFile->getFullFilePath());
    }
    // This can happen when WordPress is not taking from attached file, but wrong /old GUID. Try to replace it to the new one.
    elseif ($this->targetFile->getFileName() != $url_basename)
    {
        $url = str_replace($url_basename, $this->targetFile->getFileName(), $url);
    }

    return $url;
    //$this->targetFile

  }

  /** Tries to remove all of the old image, without touching the metadata in database
  *  This might fail on certain files, but this is not an indication of success ( remove might fail, but overwrite can still work)
  */
  protected function removeCurrent()
  {
    $meta = \wp_get_attachment_metadata( $this->post_id );
    $backup_sizes = get_post_meta( $this->post_id, '_wp_attachment_backup_sizes', true );

    // this must be -scaled if that exists, since wp_delete_attachment_files checks for original_files but doesn't recheck if scaled is included since that the one 'that exists' in WP . $this->source_file replaces original image, not the -scaled one.
    $file = $this->sourceFile->getFullFilePath();
    $result = \wp_delete_attachment_files($this->post_id, $meta, $backup_sizes, $file );

    // If Attached file is not the same path as file, this indicates a -scaled images is in play.
    $attached_file = get_attached_file($this->post_id);
    if ($file !== $attached_file && file_exists($attached_file))
    {
       @unlink($attached_file);
    }


  }

  /** Handle new dates for the replacement */
  protected function updateDate()
  {
    global $wpdb;
    $post_date = $this->datetime;
    $post_date_gmt = get_gmt_from_date($post_date);

    $update_ar = array('ID' => $this->post_id);
    if ($this->timeMode == static::TIME_UPDATEALL || $this->timeMode == static::TIME_CUSTOM)
    {
      $update_ar['post_date'] = $post_date;
      $update_ar['post_date_gmt'] = $post_date_gmt;
    }
    else {
      //$update_ar['post_date'] = 'post_date';
    //  $update_ar['post_date_gmt'] = 'post_date_gmt';
    }
    $update_ar['post_modified'] = $post_date;
    $update_ar['post_modified_gmt'] = $post_date_gmt;

    $updated = $wpdb->update( $wpdb->posts, $update_ar , array('ID' => $this->post_id) );

    wp_cache_delete($this->post_id, 'posts');

  }


  protected function doSearchReplace($args = array())
  {
    $defaults = array(
        'thumbnails_only' => false,
    );

    $args = wp_parse_args($args, $defaults);

     // Search-and-replace filename in post database
     // @todo Check this with scaled images.
 		$base_url = parse_url($this->source_url, PHP_URL_PATH);// emr_get_match_url( $this->source_url);
    $base_url = str_replace('.' . pathinfo($base_url, PATHINFO_EXTENSION), '', $base_url);


    /** Fail-safe if base_url is a whole directory, don't go search/replace */
    if (is_dir($base_url))
    {
      Log::addError('Search Replace tried to replace to directory - ' . $base_url);
      Notices::addError(__('Fail Safe :: Source Location seems to be a directory.', 'enable-media-replace'));
      return;
    }

    if (strlen(trim($base_url)) == 0)
    {
      Log::addError('Current Base URL emtpy - ' . $base_url);
      Notices::addError(__('Fail Safe :: Source Location returned empty string. Not replacing content','enable-media-replace'));
      return;
    }

    // get relurls of both source and target.
    $urls = $this->getRelativeURLS();


    if ($args['thumbnails_only'])
    {
      foreach($urls as $side => $data)
      {
        if (isset($data['base']))
        {
          unset($urls[$side]['base']);
        }
        if (isset($data['file']))
        {
          unset($urls[$side]['file']);
        }
      }
    }

    $search_urls = $urls['source'];
    $replace_urls = $urls['target'];

    /* If the replacement is much larger than the source, there can be more thumbnails. This leads to disbalance in the search/replace arrays.
      Remove those from the equation. If the size doesn't exist in the source, it shouldn't be in use either */
    foreach($replace_urls as $size => $url)
    {
      if (! isset($search_urls[$size]))
      {
        Log::addDebug('Dropping size ' . $size . ' - not found in source urls');
        unset($replace_urls[$size]);
      }
    }

    Log::addDebug('Source', $this->source_metadata);
    Log::addDebug('Target', $this->target_metadata);
    /* If on the other hand, some sizes are available in source, but not in target, try to replace them with something closeby.  */
    foreach($search_urls as $size => $url)
    {
        if (! isset($replace_urls[$size]))
        {
           $closest = $this->findNearestSize($size);
           if ($closest)
           {
              $sourceUrl = $search_urls[$size];
              $baseurl = trailingslashit(str_replace(wp_basename($sourceUrl), '', $sourceUrl));
              Log::addDebug('Nearest size of source ' . $size . ' for target is ' . $closest);
              $replace_urls[$size] = $baseurl . $closest;
           }
           else
           {
             Log::addDebug('Unset size ' . $size . ' - no closest found in source');
           }
        }
    }

    /* If source and target are the same, remove them from replace. This happens when replacing a file with same name, and +/- same dimensions generated.

    After previous loops, for every search there should be a replace size.
    */
    foreach($search_urls as $size => $url)
    {
        $replace_url = isset($replace_urls[$size]) ? $replace_urls[$size] : false;
        if ($url == $replace_url) // if source and target as the same, no need for replacing.
        {
          unset($search_urls[$size]);
          unset($replace_urls[$size]);
        }
    }

    // If the two sides are disbalanced, the str_replace part will cause everything that has an empty replace counterpart to replace it with empty. Unwanted.
    if (count($search_urls) !== count($replace_urls))
    {
      Log::addError('Unbalanced Replace Arrays, aborting', array($search_urls, $replace_urls, count($search_urls), count($replace_urls) ));
      Notices::addError(__('There was an issue with updating your image URLS: Search and replace have different amount of values. Aborting updating thumbnails', 'enable-media-replace'));
      return;
    }

    Log::addDebug('Doing meta search and replace -', array($search_urls, $replace_urls) );
    Log::addDebug('Searching with BaseuRL ' . $base_url);

    do_action('emr/replace_urls', $search_urls, $replace_urls);
    $updated = 0;

    $updated += $this->doReplaceQuery($base_url, $search_urls, $replace_urls);

    $replaceRuns = apply_filters('emr/replacer/custom_replace_query', array(), $base_url, $search_urls, $replace_urls);
    Log::addDebug("REPLACE RUNS", $replaceRuns);
    foreach($replaceRuns as $component => $run)
    {
       Log::addDebug('Running additional replace for : '. $component, $run);
       $updated += $this->doReplaceQuery($run['base_url'], $run['search_urls'], $run['replace_urls']);
    }
    //do_action('')

    Log::addDebug("Updated Records : " . $updated);
    return $updated;
  } // doSearchReplace


  private function doReplaceQuery($base_url, $search_urls, $replace_urls)
  {
    global $wpdb;
    /* Search and replace in WP_POSTS */
    // Removed $wpdb->remove_placeholder_escape from here, not compatible with WP 4.8
    $posts_sql = $wpdb->prepare(
      "SELECT ID, post_content FROM $wpdb->posts WHERE post_status = 'publish' AND post_content LIKE %s",
      '%' . $base_url . '%');

    $rs = $wpdb->get_results( $posts_sql, ARRAY_A );
    $number_of_updates = 0;

    if ( ! empty( $rs ) ) {
      foreach ( $rs AS $rows ) {
        $number_of_updates = $number_of_updates + 1;
        // replace old URLs with new URLs.

        $post_content = $rows["post_content"];
        $post_id = $rows['ID'];
        $replaced_content = $this->replaceContent($post_content, $search_urls, $replace_urls);

        if ($replaced_content !== $post_content)
        {
          //Log::addDebug('POST CONTENT TO SAVE', $replaced_content);

        //  $result = wp_update_post($post_ar);
          $sql = 'UPDATE ' . $wpdb->posts . ' SET post_content = %s WHERE ID = %d';
          $sql = $wpdb->prepare($sql, $replaced_content, $post_id);

  //Log::addTemp("POSt update query " . $sql);
          $result = $wpdb->query($sql);

          if ($result === false)
          {
            Notice::addError('Something went wrong while replacing' .  $result->get_error_message() );
            Log::addError('WP-Error during post update', $result);
          }
        }

      }
    }

    $number_of_updates += $this->handleMetaData($base_url, $search_urls, $replace_urls);
    return $number_of_updates;
  }

  private function handleMetaData($url, $search_urls, $replace_urls)
  {
    global $wpdb;

    $meta_options = apply_filters('emr/metadata_tables', array('post', 'comment', 'term', 'user'));
    $number_of_updates = 0;

    foreach($meta_options as $type)
    {
        switch($type)
        {
          case "post": // special case.
              $sql = 'SELECT meta_id as id, meta_key, meta_value FROM ' . $wpdb->postmeta . '
                WHERE post_id in (SELECT ID from '. $wpdb->posts . ' where post_status = "publish") AND meta_value like %s';
              $type = 'post';

              $update_sql = ' UPDATE ' . $wpdb->postmeta . ' SET meta_value = %s WHERE meta_id = %d';
          break;
          default:
              $table = $wpdb->{$type . 'meta'};  // termmeta, commentmeta etc

              $meta_id = 'meta_id';
              if ($type == 'user')
                $meta_id = 'umeta_id';

              $sql = 'SELECT ' . $meta_id . ' as id, meta_value FROM ' . $table . '
                WHERE meta_value like %s';

              $update_sql = " UPDATE $table set meta_value = %s WHERE $meta_id  = %d ";
          break;
        }

        $sql = $wpdb->prepare($sql, '%' . $url . '%');

        // This is a desparate solution. Can't find anyway for wpdb->prepare not the add extra slashes to the query, which messes up the query.
    //    $postmeta_sql = str_replace('[JSON_URL]', $json_url, $postmeta_sql);
        $rsmeta = $wpdb->get_results($sql, ARRAY_A);

        if (! empty($rsmeta))
        {
          foreach ($rsmeta as $row)
          {
            $number_of_updates++;
            $content = $row['meta_value'];


            $id = $row['id'];

           $content = $this->replaceContent($content, $search_urls, $replace_urls); //str_replace($search_urls, $replace_urls, $content);

           $prepared_sql = $wpdb->prepare($update_sql, $content, $id);

           Log::addDebug('Update Meta SQl' . $prepared_sql);
           $result = $wpdb->query($prepared_sql);

          }
        }
    } // foreach

    return $number_of_updates;
  } // function



  /**
  * Replaces Content across several levels of possible data
  * @param $content String The Content to replace
  * @param $search String Search string
  * @param $replace String Replacement String
  * @param $in_deep Boolean.  This is use to prevent serialization of sublevels. Only pass back serialized from top.
  */
  private function replaceContent($content, $search, $replace, $in_deep = false)
  {
    //$is_serial = false;
    $content = maybe_unserialize($content);
    $isJson = $this->isJSON($content);

    if ($isJson)
    {
      Log::addDebug('Found JSON Content');
      $content = json_decode($content);
      Log::addDebug('J/Son Content', $content);

    }

    if (is_string($content))  // let's check the normal one first.
    {
      $content = apply_filters('emr/replace/content', $content, $search, $replace);

      $content = str_replace($search, $replace, $content);
    }
    elseif (is_wp_error($content)) // seen this.
    {
       //return $content;  // do nothing.
    }
    elseif (is_array($content) ) // array metadata and such.
    {
      foreach($content as $index => $value)
      {
        $content[$index] = $this->replaceContent($value, $search, $replace, true); //str_replace($value, $search, $replace);
        if (is_string($index)) // If the key is the URL (sigh)
        {
           $index_replaced = $this->replaceContent($index, $search,$replace, true);
           if ($index_replaced !== $index)
             $content = $this->change_key($content, array($index => $index_replaced));
        }
      }
    }
    elseif(is_object($content)) // metadata objects, they exist.
    {
      foreach($content as $key => $value)
      {
        $content->{$key} = $this->replaceContent($value, $search, $replace, true); //str_replace($value, $search, $replace);
      }
    }

    if ($isJson && $in_deep === false) // convert back to JSON, if this was JSON. Different than serialize which does WP automatically.
    {
      Log::addDebug('Value was found to be JSON, encoding');
      // wp-slash -> WP does stripslashes_deep which destroys JSON
      $content = json_encode($content, JSON_UNESCAPED_SLASHES);
      Log::addDebug('Content returning', array($content));
    }
    elseif($in_deep === false && (is_array($content) || is_object($content)))
      $content = maybe_serialize($content);

    return $content;
  }

  private function change_key($arr, $set) {
        if (is_array($arr) && is_array($set)) {
    		$newArr = array();
    		foreach ($arr as $k => $v) {
    		    $key = array_key_exists( $k, $set) ? $set[$k] : $k;
    		    $newArr[$key] = is_array($v) ? $this->change_key($v, $set) : $v;
    		}
    		return $newArr;
    	}
    	return $arr;
  }

  private function getFilesFromMetadata($meta)
  {
        $fileArray = array();
        if (isset($meta['file']))
          $fileArray['file'] = $meta['file'];

        if (isset($meta['sizes']))
        {
          foreach($meta['sizes'] as $name => $data)
          {
            if (isset($data['file']))
            {
              $fileArray[$name] = $data['file'];
            }
          }
        }
      return $fileArray;
  }

  /* Check if given content is JSON format. */
  private function isJSON($content)
  {
      if (is_array($content) || is_object($content))
        return false; // can never be.

      $json = json_decode($content);
      return $json && $json != $content;
  }

  // Get REL Urls of both source and target.
  private function getRelativeURLS()
  {
      $dataArray = array(
          'source' => array('url' => $this->source_url, 'metadata' => $this->getFilesFromMetadata($this->source_metadata) ),
          'target' => array('url' => $this->target_url, 'metadata' => $this->getFilesFromMetadata($this->target_metadata) ),
      );

    //  Log::addDebug('Source Metadata', $this->source_metadata);
  //    Log::addDebug('Target Metadata', $this->target_metadata);

      $result = array();

      foreach($dataArray as $index => $item)
      {
          $result[$index] = array();
          $metadata = $item['metadata'];

          $baseurl = parse_url($item['url'], PHP_URL_PATH);
          $result[$index]['base'] = $baseurl;  // this is the relpath of the mainfile.
          $baseurl = trailingslashit(str_replace( wp_basename($item['url']), '', $baseurl)); // get the relpath of main file.

          foreach($metadata as $name => $filename)
          {
              $result[$index][$name] =  $baseurl . wp_basename($filename); // filename can have a path like 19/08 etc.
          }

      }
  //    Log::addDebug('Relative URLS', $result);
      return $result;
  }


  /** FindNearestsize
  * This works on the assumption that when the exact image size name is not available, find the nearest width with the smallest possible difference to impact the site the least.
  */
  private function findNearestSize($sizeName)
  {
     Log::addDebug('Find Nearest: '. $sizeName);

      if (! isset($this->source_metadata['sizes'][$sizeName]) || ! isset($this->target_metadata['width'])) // This can happen with non-image files like PDF.
      {
				 // Check if metadata-less item is a svg file. Just the main file to replace all thumbnails since SVG's don't need thumbnails.
				 if (strpos($this->target_url, '.svg') !== false)
				 {
				 	$svg_file = wp_basename($this->target_url);
				 	return $svg_file;  // this is the relpath of the mainfile.
				 }


        return false;
      }
      $old_width = $this->source_metadata['sizes'][$sizeName]['width']; // the width from size not in new image
      $new_width = $this->target_metadata['width']; // default check - the width of the main image

      $diff = abs($old_width - $new_width);
    //  $closest_file = str_replace($this->relPath, '', $this->newMeta['file']);
      $closest_file = wp_basename($this->target_metadata['file']); // mainfile as default

      foreach($this->target_metadata['sizes'] as $sizeName => $data)
      {
          $thisdiff = abs($old_width - $data['width']);

          if ( $thisdiff  < $diff )
          {
              $closest_file = $data['file'];
              if(is_array($closest_file)) { $closest_file = $closest_file[0];} // HelpScout case 709692915
              if(!empty($closest_file)) {
                  $diff = $thisdiff;
                  $found_metasize = true;
              }
          }
      }


      if(empty($closest_file)) return false;

      return $closest_file;


  }

} // class