<?php
/**
 * Helper Functions List
 *
 * Can be called via Singleton. Since Singleton uses magic method __call().
 * Example:
 *
 * Add Media to GS storage:
 * ud_get_stateless_media()->add_media( false, $post_id );
 *
 * @class Utility
 */

namespace wpCloud\StatelessMedia {

  if( !class_exists( 'wpCloud\StatelessMedia\Utility' ) ) {

    class Utility {

      static $can_delete_attachment = [];
      static $synced_sizes = [];

      /**
       * ChromeLogger
       *
       * @author potanin@UD
       * @param $data
       */
      static public function log( $data ) {

        if( !class_exists( 'wpCloud\StatelessMedia\Logger' ) ) {
          include_once( __DIR__ . '/class-logger.php' );
        }

        if( !class_exists( 'wpCloud\StatelessMedia\Logger' ) ) {
          return;
        }

        if( defined( 'WP_STATELESS_CONSOLE_LOG' ) && WP_STATELESS_CONSOLE_LOG ) {
          Logger::log( '[wp-stateless]', $data );
        }

      }

      /**
       * Override Cache Control
       * @param $cacheControl
       * @return mixed
       */
      public static function override_cache_control( $cacheControl ) {
        return ud_get_stateless_media()->get( 'sm.cache_control' );
      }

      /**
       * wp_normalize_path was added in 3.9.0
       *
       * @param $path
       * @return mixed|string
       *
       */
      public static function normalize_path( $path ) {

        if( function_exists( 'wp_normalize_path' ) ) {
          return wp_normalize_path( $path );
        }

        $path = str_replace( '\\', '/', $path );
        $path = preg_replace( '|/+|', '/', $path );
        return $path;

      }

      /**
       * Randomize file name
       * @param $filename
       * @return string
       */
      public static function randomize_filename( $filename ) {
        $return = apply_filters( 'stateless_skip_cache_busting', null, $filename );
        if( $return ) {
          return $return;
        }

        if( preg_match( '/^[a-f0-9]{8}-/', $filename ) ) {
          return $filename;
        }

        $info = pathinfo( $filename );
        $ext = empty( $info[ 'extension' ] ) ? '' : '' . $info[ 'extension' ];
        $_parts = array();
        $rand = substr( md5( time() ), 0, 8 );

        if( strpos( $info[ 'filename' ], '@' ) ) {
          $_cleanName = explode( '@', $info[ 'filename' ] )[ 0 ];
          $_retna = explode( '@', $info[ 'filename' ] )[ 1 ];
          $_parts[] = $rand;
          $_parts[] = '-';
          $_parts[] = strtolower( $_cleanName );
          $_parts[] = '@' . strtolower( $_retna );
        } else {
          $_parts[] = $rand;
          $_parts[] = '-';
          $_parts[] = strtolower( $info[ 'filename' ] );
        }

        $filename = join( '', $_parts );
        if( !empty( $ext ) ) {
          $filename .= '.' . $ext;
        }

        return $filename;
      }

      /**
       * Get Media Item Content Disposition
       *
       * @param null $attachment_id
       * @param array $metadata
       * @param array $data
       * @return string
       */
      public static function getContentDisposition( $attachment_id = null, $metadata = array(), $data = array() ) {
        // return 'Content-Disposition: attachment; filename=some-file.sql';
        return apply_filters( 'sm:item:contentDisposition', null, array( 'attachment_id' => $attachment_id, 'mime_type' => get_post_mime_type( $attachment_id ), 'metadata' => $metadata, 'data' => $data ) );
      }

      /**
       * @param null $attachment_id
       * @param array $metadata
       * @param array $data
       * @return string
       */
      public static function getCacheControl( $attachment_id = null, $metadata = array(), $data = array() ) {
        if( !$attachment_id ) {
          return apply_filters( 'sm:item:cacheControl', 'private, no-cache, no-store', $attachment_id, array( 'attachment_id' => null, 'mime_type' => null, 'metadata' => $metadata, 'data' => $data ) );
        }

        $_mime_type = get_post_mime_type( $attachment_id );

        // Treat images as public.
        if( strpos( $_mime_type, 'image/' ) !== false ) {
          return apply_filters( 'sm:item:cacheControl', 'public, max-age=36000, must-revalidate', array( 'attachment_id' => $attachment_id, 'mime_type' => null, 'metadata' => $metadata, 'data' => $data ) );
        }

        // Treat images as public.
        if( strpos( $_mime_type, 'sql' ) !== false ) {
          return apply_filters( 'sm:item:cacheControl', 'private, no-cache, no-store', array( 'attachment_id' => $attachment_id, 'mime_type' => null, 'metadata' => $metadata, 'data' => $data ) );
        }

        return apply_filters( 'sm:item:cacheControl', 'public, max-age=30, no-store, must-revalidate', array( 'attachment_id' => $attachment_id, 'mime_type' => null, 'metadata' => $metadata, 'data' => $data ) );
      }

      /**
       * Add/Update Media to Bucket
       * Fired for every action with image add or update
       *
       * $force and $args params will no be passed on media library uploads.
       * This two will be passed on by compatibility.
       *
       * @action wp_generate_attachment_metadata
       * @author peshkov@UD
       * @param $metadata
       * @param $attachment_id
       * @param boolean $force Whether to force the upload incase of it's already exists.
       * @param array $args Whether to only sync the full size image.
       * @return bool|string
       */
      public static function add_media( $metadata, $attachment_id, $force = false, $args = array() ) {
        global $stateless_synced_full_size;
        $sm_mode = ud_get_stateless_media()->get( 'sm.mode' );
        $file = '';
        $upload_dir = wp_upload_dir();
        $args = wp_parse_args( $args, array( 'no_thumb' => false, 'is_webp' => '', // expected value ".webp";
        ) );

        /* Get metadata in case if method is called directly. */
        if( current_filter() !== 'wp_generate_attachment_metadata' && current_filter() !== 'wp_update_attachment_metadata' && current_filter() !== 'intermediate_image_sizes_advanced' ) {
          $metadata = wp_get_attachment_metadata( $attachment_id );
        }

        // making sure meta data isn't null.
        if( empty( $metadata ) ) {
          $metadata = array();
        }

        /**
         * To skip the sync process.
         *
         * Returning a non-null value
         * will effectively short-circuit the function.
         *
         * $force and $args params will no be passed on non media library uploads.
         * This two will be passed on by compatibility.
         *
         * @since 2.2.4
         *
         * @param bool              $value          This should return true if want to skip the sync.
         * @param int               $metadata       Metadata for the attachment.
         * @param string            $attachment_id  Attachment ID.
         * @param bool              $force          (optional) Whether to force the sync even the file already exist in GCS.
         * @param bool              $args           (optional) Whether to only sync the full size image.
         */
        $check = apply_filters( 'wp_stateless_skip_add_media', null, $metadata, $attachment_id, $force, $args );

        $client = ud_get_stateless_media()->get_client();

        if( ( !is_wp_error( $client ) || ( $sm_mode == 'stateless' && !wp_doing_ajax() ) ) && !$check ) {

          $image_host          = ud_get_stateless_media()->get_gs_host();
          $bucketLink          = apply_filters('wp_stateless_bucket_link', $image_host);
          $fullsizepath        = wp_normalize_path( get_attached_file( $attachment_id ) );
          $_cacheControl       = self::getCacheControl( $attachment_id, $metadata, null );
          $_contentDisposition = self::getContentDisposition( $attachment_id, $metadata, null );

          // Ensure image upload to GCS when attachment is updated,
          // by checking if the attachment metadata is changed.
          if( $attachment_id && !empty( $metadata ) && !$force ) {
            $db_metadata = get_post_meta( $attachment_id, '_wp_attachment_metadata', true );
            if( $db_metadata != $metadata ) {
              $force = true;
            }
          }

          /**
           * To skip removing files from server
           *
           * Returning a non-null value
           * will effectively short-circuit the function.
           *
           * $force and $args params will no be passed on non media library uploads.
           * This two will be passed on by compatibility.
           *
           * @since 3.0
           *
           * @param bool              $value          This should return true if want to skip the sync.
           * @param int               $metadata       Metadata for the attachment.
           * @param string            $attachment_id  Attachment ID.
           * @param bool              $force          (optional) Whether to force the sync even the file already exist in GCS.
           * @param bool              $args           (optional) Whether to only sync the full size image.
           */
          $skip_remove_media = apply_filters( 'wp_stateless_skip_remove_media', false, $metadata, $attachment_id, $force, $args );

          // Make non-images uploadable.
          // empty $metadata['file'] can cause problem, so we need to generate it.
          if( empty( $metadata[ 'file' ] ) && $attachment_id ) {
            $mime_type = get_post_mime_type( $attachment_id );
            $file = str_replace( wp_normalize_path( trailingslashit( $upload_dir[ 'basedir' ] ) ), '', $fullsizepath );

            // We shouldn't create $metadata["file"] if it's PDF file.
            if( $mime_type != "application/pdf" ) {
              $metadata[ "file" ] = $file;
            }
          }

          $cloud_meta = get_post_meta( $attachment_id, 'sm_cloud', true );

          $cloud_meta = wp_parse_args($cloud_meta, array(
            'name'               => '',
            'bucket'             => ud_get_stateless_media()->get( 'sm.bucket' ),
            'fileLink'           => '',
            'mediaLink'          => '',
            'cacheControl'       => $_cacheControl,
            'contentDisposition' => $_contentDisposition,
            'sizes'              => array(),
          ));

          /**
           * Storing file size to sm_cloud first,
           * Because assigning directly to $metadata['filesize'] don't work.
           * Maybe filesize gets removed in first run (when file exists).
           */
          if( file_exists( $fullsizepath ) ) {
            $cloud_meta[ 'filesize' ] = filesize( $fullsizepath );
          }
          // Getting file size from sm_cloud.
          if( !empty( $cloud_meta[ 'filesize' ] ) ) {
            $metadata[ 'filesize' ] = $cloud_meta[ 'filesize' ];
          }

          $image_sizes = self::get_path_and_url( $metadata, $attachment_id );
          foreach( $image_sizes as $size => $img ) {
            if ( (isset($_REQUEST['size']) && $_REQUEST['size'] == $size) || empty($_REQUEST['size']) ) {
              // also skips full size image if already uploaded using that feature.
              // and delete it in ephemeral modes as it already bin uploaded through intermediate_image_sizes_advanced filter.
              if( !$img[ 'is_thumb' ] && $stateless_synced_full_size == $attachment_id ) {
                if( $sm_mode === 'ephemeral' && $args[ 'no_thumb' ] != true && \file_exists( $img[ 'path' ] ) && !$skip_remove_media ) {
                  unlink( $img[ 'path' ] );
                }
                continue;
              }

              // skips thumbs when it's called from Upload the full size image first, through intermediate_image_sizes_advanced filter.
              if( $args[ 'no_thumb' ] && $img[ 'is_thumb' ] || !empty( self::$synced_sizes[ $attachment_id ][ $size ] ) && $sm_mode !== 'stateless'  && !$args[ 'is_webp' ] ) {
                continue;
              }

              // GCS metadata
              $_metadata = array(
                "width"     => $img[ 'width' ],
                "height"    => $img[ 'height' ],
                'child-of'  => $attachment_id,
                'file-hash' => md5( $file ),
                'size'      => $size,
              );

              // adding extra GCS meta for full size image.
              if( !$img[ 'is_thumb' ] ) {
                unset( $_metadata[ 'child-of' ] ); // no need in full size image.
                $_metadata[ 'object-id' ] = $attachment_id;
                $_metadata[ 'source-id' ] = md5( $attachment_id . ud_get_stateless_media()->get( 'sm.bucket' ) );
              }

              $media_args = array_filter( array(
                'force'              => $img['is_thumb'] ? $force : $force && $stateless_synced_full_size != $attachment_id,
                'name'               => $img['gs_name'],
                'is_webp'            => $args['is_webp'],
                'mimeType'           => $img['mime_type'],
                'metadata'           => $_metadata,
                'absolutePath'       => $img['path'],
                'cacheControl'       => $_cacheControl,
                'contentDisposition' => $_contentDisposition,
              ) );

              if ( $sm_mode == 'stateless' && !wp_doing_ajax() ) {
                global $gs_client;

                $media_args = wp_parse_args( $media_args, array(
                  'use_root' => true,
                  'force' => false,
                  'name' => false,
                  'absolutePath' => false,
                  'mimeType' => 'image/jpeg',
                  'metadata' => array(),
                  'is_webp' => '',
                ) );
                $media_args = apply_filters('wp_stateless_add_media_args', $media_args);

                //Bucket
                $bucket = ud_get_stateless_media()->get( 'sm.bucket' );

                $bucket = $gs_client->bucket($bucket);
                $object = $bucket->object($media_args['name']);

                /**
                 * Updating object metadata, ACL, CacheControl and contentDisposition
                 * @return media object
                 */
                try {
                  $media = $object->update( array( 'metadata' => $media_args['metadata']) +
                    array('cacheControl' => $_cacheControl,
                      'predefinedAcl' => 'publicRead',
                      'contentDisposition' => $_contentDisposition)
                  );

                  $cloud_meta = self::generate_cloud_meta($cloud_meta, $media, $size, $img, $bucketLink);
                } catch (\Throwable $th) {
                  //throw $th;
                }

                $cloud_meta = self::generate_cloud_meta($cloud_meta, $media, $size, $img, $bucketLink);

              } else {
                /* Add default image */
                $media = $client->add_media( $media_args);

                /* Break if we have errors. */
                if( !is_wp_error( $media ) ) {
                  // @note We don't add storageClass because it's same as parent...
                  $cloud_meta = self::generate_cloud_meta( $cloud_meta, $media, $size, $img, $bucketLink );

                  /**
                   * Ephemeral and stateless mode: we don't need the local version.
                   * Except when uploading the full size image first.
                   */
                  if( self::can_delete_attachment( $attachment_id, $args ) && !$skip_remove_media ) {
                    unlink( $img[ 'path' ] );
                  }
                }
              }
              // Setting
              if( empty( self::$synced_sizes[ $attachment_id ][ $size ] ) ) {
                self::$synced_sizes[ $attachment_id ][ $size ] = true;
              }
            }
          }
          // End of image sync loop
          if( !$args[ 'is_webp' ] ) {
            update_post_meta( $attachment_id, 'sm_cloud', $cloud_meta );
          } else {
            // There is no use case for is_webp meta.
            // $cloud_meta = get_post_meta( $attachment_id, 'sm_cloud', true);
            // $cloud_meta['is_webp'] = true;
            // update_post_meta( $attachment_id, 'sm_cloud', $cloud_meta );
          }

          if( $args[ 'no_thumb' ] == true ) {
            $stateless_synced_full_size = $attachment_id;
          }

          /**
           * Triggers when the media and it's thumbs are synced.
           *
           * $force and $args params will no be passed on non media library uploads.
           * This two will be passed on by compatibility.
           *
           * @since 2.2.5
           *
           * @param int               $metadata       Metadata for the attachment.
           * @param string            $attachment_id  Attachment ID.
           * @param bool              $force          (optional) Whether to force the sync even the file already exist in GCS.
           * @param bool              $args           (optional) Whether to only sync the full size image.
           */
          $metadata = apply_filters( 'wp_stateless_media_synced', $metadata, $attachment_id, $force, $args );
        }

        return $metadata;
      }

      /**
       * Remove Media from Bucket by post ID
       * Fired on calling function wp_delete_attachment()
       *
       * @todo: add error logging. peshkov@UD
       * @see wp_delete_attachment()
       * @action delete_attachment
       * @author peshkov@UD
       * @param $post_id
       */
      public static function remove_media( $post_id ) {
        /* Get attachments metadata */
        $metadata = wp_get_attachment_metadata( $post_id );

        /* Be sure we have the same bucket in settings and have GS object's name before proceed. */
        if( isset( $metadata[ 'gs_name' ] ) && isset( $metadata[ 'gs_bucket' ] ) && $metadata[ 'gs_bucket' ] == ud_get_stateless_media()->get( 'sm.bucket' ) ) {
          $client = ud_get_stateless_media()->get_client();
          if( !is_wp_error( $client ) ) {

            /* Remove default image */
            $client->remove_media( $metadata[ 'gs_name' ], $post_id );
            // Remove webp
            $client->remove_media( $metadata[ 'gs_name' ] . '.webp', $post_id, true, "", true );

            /* Now, go through all sizes and remove 'image sizes' images from Bucket too. */
            if( !empty( $metadata[ 'sizes' ] ) && is_array( $metadata[ 'sizes' ] ) ) {
              foreach( $metadata[ 'sizes' ] as $k => $v ) {
                if( !empty( $v[ 'gs_name' ] ) ) {
                  $client->remove_media( $v[ 'gs_name' ], $post_id, true, $k );
                  $client->remove_media( $v[ 'gs_name' ] . '.webp', $post_id, true, $k, true );
                }
              }
            }

          }
        }
      }

      /**
       * Return URL and path for all image sizes of a attachment.
       * @param $metadata
       * @param $attachment_id
       * @return mixed
       */
      public static function get_path_and_url( $metadata, $attachment_id ) {
        /* Get metadata in case if method is called directly. */
        if( empty( $metadata ) && current_filter() !== 'wp_generate_attachment_metadata' && current_filter() !== 'wp_update_attachment_metadata' ) {
          $metadata = wp_get_attachment_metadata( $attachment_id );
        }

        $gs_name_path = array();
        $full_size_path = get_attached_file( $attachment_id );
        $base_dir = dirname( $full_size_path );

        $use_wildcards = self::is_use_wildcards();
        $gs_name = apply_filters( 'wp_stateless_file_name', $full_size_path, true, $attachment_id, '', $use_wildcards );
        $gs_base_dir = dirname( $gs_name ) == '.' ? '' : trailingslashit(dirname( $gs_name ));

        if( !isset( $metadata[ 'width' ] ) && file_exists( $full_size_path ) ) {
          try {
            $_image_size = getimagesize( $full_size_path );
            $metadata[ 'width' ] = $_image_size[ 0 ];
            $metadata[ 'height' ] = $_image_size[ 1 ];
          } catch( \Exception $e ) {
            // lets do nothing.
          }
        }

        $gs_name_path['__full'] = array(
          'gs_name'   => $gs_name,
          'path'      => $full_size_path,
          'sm_meta'   => true,
          'is_thumb'  => false,
          'mime_type' => get_post_mime_type( $attachment_id ),
          'width'     => isset($metadata['width']) ? $metadata['width'] : null,
          'height'    => isset($metadata['height']) ? $metadata['height'] : null,
        );

        /* Now we go through all available image sizes and upload them to Google Storage */
        if( !empty( $metadata[ 'sizes' ] ) && is_array( $metadata[ 'sizes' ] ) ) {
          foreach( $metadata[ 'sizes' ] as $image_size => $data ) {
            if( empty( $data[ 'file' ] ) ) continue;
            $absolutePath = wp_normalize_path( $base_dir . '/' . $data[ 'file' ] );
            $gs_name = $gs_base_dir . $data[ 'file' ];
            $gs_name = apply_filters( 'wp_stateless_file_name', $gs_name, true, $attachment_id, $image_size, $use_wildcards );

            $gs_name_path[$image_size] = array(
              'gs_name'   => $gs_name,
              'path'      => $absolutePath,
              'sm_meta'   => true,
              'is_thumb'  => true,
              'mime_type' => $data['mime-type'],
              'width'     => $data['width'],
              'height'    => $data['height'],
            );
          }
        }

        return apply_filters( 'wp_stateless_get_path_and_url', $gs_name_path, $metadata, $attachment_id );
      }

      /**
       * Return URL and path for all image sizes of a attachment.
       * @param $cloud_meta
       * @param $media
       * @param $image_size
       * @param $img
       * @param $bucketLink
       * @return mixed
       */
      public static function generate_cloud_meta( $cloud_meta, $media, $image_size, $img, $bucketLink ) {
        $gs_name = !empty( $media[ 'name' ] ) ? $media[ 'name' ] : $img[ 'gs_name' ];
        $fileLink = trailingslashit( $bucketLink ) . $gs_name;
        $version = get_option( 'wp_sm_version', false );

        if( $img[ 'is_thumb' ] ) {
          // Cloud meta for thumbs.
          $cloud_meta[ 'sizes' ][ $image_size ]['name']         = $gs_name;
          $cloud_meta[ 'sizes' ][ $image_size ]['fileLink']     = $fileLink;
          $cloud_meta[ 'sizes' ][ $image_size ]['mediaLink']    = $media[ 'mediaLink' ];
          $cloud_meta[ 'sizes' ][ $image_size ]['width']        = ($media[ 'metadata' ][ 'width' ]) ? $media[ 'metadata' ][ 'width' ] : $img[ 'width' ];
          $cloud_meta[ 'sizes' ][ $image_size ]['height']       = ($media[ 'metadata' ][ 'height' ]) ? $media[ 'metadata' ][ 'width' ] : $img[ 'height' ];
        }
        else{
          // cloud meta for full size image.
          $cloud_meta['name']                   = $gs_name;
          $cloud_meta['fileLink']               = $fileLink;
          $cloud_meta['mediaLink']              = $media[ 'mediaLink' ];
          $cloud_meta['width']                  = ($media[ 'metadata' ][ 'width' ]) ? $media[ 'metadata' ][ 'width' ] : $img[ 'width' ];
          $cloud_meta['height']                 = ($media[ 'metadata' ][ 'height' ]) ? $media[ 'metadata' ][ 'width' ] : $img[ 'height' ];
          $cloud_meta['bucket']                 = ud_get_stateless_media()->get( 'sm.bucket' );
          $cloud_meta['sm_version']             = $version;
        }
        return apply_filters( 'wp_stateless_generate_cloud_meta', $cloud_meta, $media, $image_size, $img, $bucketLink );
      }

      /**
       * join_url
       *
       * @param array $parts
       * @param boolean $encode
       * @return string $url
       */
      public static function join_url( $parts, $encode=TRUE ){
        if ( $encode ){
          if ( isset( $parts['user'] ) )
            $parts['user']     = rawurlencode( $parts['user'] );
          if ( isset( $parts['pass'] ) )
            $parts['pass']     = rawurlencode( $parts['pass'] );
          if ( isset( $parts['host'] ) &&
            !preg_match( '!^(\[[\da-f.:]+\]])|([\da-f.:]+)$!ui', $parts['host'] ) )
            $parts['host']     = rawurlencode( $parts['host'] );
          if ( !empty( $parts['path'] ) )
            $parts['path']     = preg_replace( '!%2F!ui', '/',
              rawurlencode( $parts['path'] ) );
          if ( isset( $parts['query'] ) )
            $parts['query']    = rawurlencode( $parts['query'] );
          if ( isset( $parts['fragment'] ) )
            $parts['fragment'] = rawurlencode( $parts['fragment'] );
        }

        $url = '';
        if ( !empty( $parts['scheme'] ) )
          $url .= $parts['scheme'] . ':';
        if ( isset( $parts['host'] ) ){
          $url .= '//';
          if ( isset( $parts['user'] ) ){
            $url .= $parts['user'];
            if ( isset( $parts['pass'] ) )
              $url .= ':' . $parts['pass'];
            $url .= '@';
          }
          if ( preg_match( '!^[\da-f]*:[\da-f.:]+$!ui', $parts['host'] ) )
            $url .= '[' . $parts['host'] . ']'; // IPv6
          else
            $url .= $parts['host'];             // IPv4 or name
          if ( isset( $parts['port'] ) )
            $url .= ':' . $parts['port'];
          if ( !empty( $parts['path'] ) && $parts['path'][0] != '/' )
            $url .= '/';
        }
        if ( !empty( $parts['path'] ) )
          $url .= $parts['path'];
        if ( isset( $parts['query'] ) )
          $url .= '?' . $parts['query'];
        if ( isset( $parts['fragment'] ) )
          $url .= '#' . $parts['fragment'];
        return $url;
      }

      /**
       * add_webp_mime
       * @param $t
       * @param $user
       * @return mixed
       */
      public function add_webp_mime( $t, $user ) {
        $t[ 'webp' ] = 'image/webp';
        return $t;
      }

      /**
       * Store attachment id in a static variable on 'intermediate_image_sizes_advanced' filter.
       * To indicate that we can now delete attachment from server now.
       *
       * @param array $new_sizes
       * @param array $image_meta
       * @param int $attachment_id
       * @return array $new_sizes
       */
      public static function store_can_delete_attachment( $new_sizes, $image_meta, $attachment_id ) {
        if( !in_array( $attachment_id, self::$can_delete_attachment ) ) {
          self::$can_delete_attachment[] = $attachment_id;
        }
        return $new_sizes;
      }

      /**
       * Check whether to delete attachment from server or not.
       *
       * @param int $attachment_id
       * @param array $args
       * @return boolean
       */
      public static function can_delete_attachment( $attachment_id, $args ) {
        $sm_mode = ud_get_stateless_media()->get( 'sm.mode' );

        if( in_array( $sm_mode, array( 'ephemeral', 'stateless' ) ) && $args[ 'no_thumb' ] != true ) {
          // checks whether it's WP 5.3 and 'intermediate_image_sizes_advanced' is passed.
          // To be sure that we don't delete full size image before thumbnails are generated.
          if(
            wp_attachment_is_image($attachment_id) &&
            function_exists('is_wp_version_compatible') &&
            is_wp_version_compatible('5.3-RC4-46673') &&
            !in_array($attachment_id, self::$can_delete_attachment)
          ){
            return false;
          }
          return true;
        }
        return false;
      }

      /**
       * Useful when there is a need to do things depending on a call stack.
       * Returns true if any of the conditions met. Returns false otherwise.
       *
       * @param $callstack array Result of debug_backtrace function.
       * @param $conditions array CallStack fingerprint with `stack_level` integer.
       *
       * Example:
       * array(
       *  array(
       *    'stack_level' => 4,
       *    'function' => '__construct',
       *    'class' => 'ET_Core_PageResource'
       *  ),
       *  array(
       *    'stack_level' => 4,
       *    'function' => 'get_cache_filename',
       *    'class' => 'ET_Builder_Element'
       *  )
       * )
       *
       * @return bool
       */
      public static function isCallStackMatches( $callstack, $conditions ) {
        if( !is_array( $conditions ) ) {
          $conditions = array( $conditions );
        }

        foreach( $conditions as $condition ) {
          $condition[ 'stack_level' ] = $condition[ 'stack_level' ] ? $condition[ 'stack_level' ] : 0;

          $levelData = $callstack[ $condition[ 'stack_level' ] ];

          unset( $condition[ 'stack_level' ] );

          $levelMatches = false;
          foreach( $condition as $key => $value ) {
            if( isset( $levelData[ $key ] ) && $levelData[ $key ] === $value ) {
              $levelMatches = true;
            } else {
              $levelMatches = false;
            }
          }

          if( $levelMatches ) return true;
        }

        return false;
      }

      /**
       * Fail over to image URL if not found on disk
       * In case image not available on both local and bucket
       * try to pull image from image URL in case it is accessible by some sort of proxy.
       *
       * @param:
       * $url (int/string): URL of the image.
       * $save_to (string): Path where to save the image.
       *
       * @return bool|int
       * @throws \Exception
       */
      public static function sync_get_attachment_if_exist( $url, $save_to ) {
        if( is_int( $url ) ) $url = wp_get_attachment_url( $url );

        $response = wp_remote_get( $url );
        if( !is_wp_error( $response ) && is_array( $response ) ) {
          if( !empty( $response[ 'response' ][ 'code' ] ) && $response[ 'response' ][ 'code' ] == 200 ) {
            try {
              if( wp_mkdir_p( dirname( $save_to ) ) ) {
                return file_put_contents( $save_to, $response[ 'body' ] );
              }
            } catch( \Exception $e ) {
              throw $e;
            }
          }
        }
        return false;
      }

      /**
       * Store failed attachment
       * @param $attachment_id
       * @param $mode
       */
      public static function sync_store_failed_attachment( $attachment_id, $mode ) {
        if( !in_array( $mode, [ 'other', 'cli_images', 'cli_other' ] ) ) {
          $mode = 'images';
        }

        $fails = get_option( 'wp_stateless_failed_' . $mode );
        if( !empty( $fails ) && is_array( $fails ) ) {
          if( !in_array( $attachment_id, $fails ) ) {
            $fails[] = $attachment_id;
          }
        } else {
          $fails = array( $attachment_id );
        }

        update_option( 'wp_stateless_failed_' . $mode, $fails );
      }

      /**
       * Checking maybe attachment have already fixed
       * @param $mode
       * @param $attachment_id
       */
      public static function sync_maybe_fix_failed_attachment( $mode, $attachment_id ) {
        $fails = get_option( 'wp_stateless_failed_' . $mode );

        if( !empty( $fails ) && is_array( $fails ) ) {
          if( in_array( $attachment_id, $fails ) ) {
            foreach( array_keys( $fails, $attachment_id ) as $key ) {
              unset( $fails[ $key ] );
            }
          }
        }

        update_option( 'wp_stateless_failed_' . $mode, $fails );
      }

      /**
       * Store current synchronization progress
       * @param $mode
       * @param $id
       * @param $cli
       */
      public static function sync_store_current_progress( $mode, $id, $cli = false ) {
        if( !in_array( $mode, [ 'other', 'cli_images', 'cli_other' ] ) ) {
          $mode = 'images';
        }

        $first_processed = get_option( 'wp_stateless_' . $mode . '_first_processed' );
        if( !$first_processed ) {
          update_option( 'wp_stateless_' . $mode . '_first_processed', $id );
        }
        $last_processed = get_option( 'wp_stateless_' . $mode . '_last_processed' );
        if( !$last_processed || $id < (int) $last_processed || $cli ) {
          update_option( 'wp_stateless_' . $mode . '_last_processed', $id );
        }
      }

      /**
       * Get synchronization progress
       * @param $mode
       * @return array|bool
       */
      public static function sync_retrieve_current_progress( $mode ) {
        if( !in_array( $mode, [ 'other', 'cli_images', 'cli_other' ] ) ) {
          $mode = 'images';
        }

        $first_processed = get_option( 'wp_stateless_' . $mode . '_first_processed' );
        $last_processed = get_option( 'wp_stateless_' . $mode . '_last_processed' );

        if( !$first_processed || !$last_processed ) {
          return false;
        }

        return array( (int) $first_processed, (int) $last_processed );
      }

      /**
       * Reset synchronization progress
       * @param $mode
       */
      public static function sync_reset_current_progress( $mode ) {
        if( !in_array( $mode, [ 'other', 'cli_images', 'cli_other' ] ) ) {
          $mode = 'images';
        }

        delete_option( 'wp_stateless_' . $mode . '_first_processed' );
        delete_option( 'wp_stateless_' . $mode . '_last_processed' );
      }

      /**
       * Get fails
       *
       * @param $mode
       * @return mixed|void
       */
      public static function sync_get_fails( $mode ) {
        if( !in_array( $mode, [ 'other', 'cli_images', 'cli_other' ] ) ) {
          $mode = 'images';
        }

        return get_option( 'wp_stateless_failed_' . $mode );
      }

      /**
       * Get_non_processed_media_ids
       *
       * @param $mode
       * @param $files
       * @param bool $continue
       * @param $start_from
       * @return array
       * @throws \Exception
       */
      public static function sync_get_non_processed_media_ids( $mode, $files, $continue = false, $start_from = 0 ) {
        if( ud_get_stateless_media()->is_connected_to_gs() !== true ) {
          throw new \Exception( __( 'Not connected to GCS', ud_get_stateless_media()->domain ) );
        }

        if( $continue ) {
          $progress = self::sync_retrieve_current_progress( $mode );

          if( false !== $progress ) {
            if( $start_from && $start_from != 0 ) {
              // adding 1 because we subtracted 1 in js code for presentation.
              $progress[ 1 ] = $start_from + 1;
            }
            $ids = array();
            foreach( $files as $file ) {
              $id = (int) $file->ID;
              // only include IDs that have not been processed yet
              if( $id > $progress[ 0 ] || $id < $progress[ 1 ] ) {
                $ids[] = $id;
              }
            }
            return $ids;
          }
        }

        self::sync_reset_current_progress( $mode );

        $ids = array();
        foreach( $files as $file ) $ids[] = (int) $file->ID;

        return $ids;
      }

      /**
       * Generate JWT token signed by current site AUTH_SALT
       * If no AUTH_SALT defined - admin email used
       *
       * @param $payload
       * @param int $ttl
       * @return string
       */
      public static function generate_jwt_token($payload, $ttl = 3600) {
        $payload = wp_parse_args( $payload, [
          'iat' => $now = time(),
          'iss' => $site_url = get_site_url(),
          'aud' => $site_url,
          'exp' => $now + $ttl
        ] );

        $key = defined('AUTH_SALT') ? AUTH_SALT : get_option('admin_email');
        return \Firebase\JWT\JWT::encode( $payload, $key );
      }

      /**
       * Verify and decode token
       * If no AUTH_SALT defined - admin email used
       * Throws exceptions if cannot decode
       *
       * @param $token
       * @return object
       * @throws \Exception
       */
      public static function verify_jwt_token($token) {
        $key = defined('AUTH_SALT') ? AUTH_SALT : get_option('admin_email');
        return \Firebase\JWT\JWT::decode($token, $key, ['HS256']);
      }

      /**
       * Generate auth token for wizard iframe
       *
       * @param int $ttl
       * @return string
       */
      public static function generate_wizard_auth_token( $ttl = 3600 ) {
        $payload = [
          'is_network' => is_network_admin(),
          'user_id' => get_current_user_id()
        ];
        return self::generate_jwt_token( $payload, $ttl );
      }

      /**
       * Maps a file extensions to a mimetype.
       *
       * @param $extension string The file extension.
       *
       * @return string|null
       * @link http://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x/conf/mime.types
       */
      public static function mimetype_from_extension($extension){
        $file_type = wp_check_filetype($extension);
        if(!empty($file_type['type'])){
          return $file_type['type'];
        }
        static $mimetypes = [
          '7z' => 'application/x-7z-compressed',
          'aac' => 'audio/x-aac',
          'ai' => 'application/postscript',
          'aif' => 'audio/x-aiff',
          'asc' => 'text/plain',
          'asf' => 'video/x-ms-asf',
          'atom' => 'application/atom+xml',
          'avi' => 'video/x-msvideo',
          'bmp' => 'image/bmp',
          'bz2' => 'application/x-bzip2',
          'cer' => 'application/pkix-cert',
          'crl' => 'application/pkix-crl',
          'crt' => 'application/x-x509-ca-cert',
          'css' => 'text/css',
          'csv' => 'text/csv',
          'cu' => 'application/cu-seeme',
          'deb' => 'application/x-debian-package',
          'doc' => 'application/msword',
          'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
          'dvi' => 'application/x-dvi',
          'eot' => 'application/vnd.ms-fontobject',
          'eps' => 'application/postscript',
          'epub' => 'application/epub+zip',
          'etx' => 'text/x-setext',
          'flac' => 'audio/flac',
          'flv' => 'video/x-flv',
          'gif' => 'image/gif',
          'gz' => 'application/gzip',
          'htm' => 'text/html',
          'html' => 'text/html',
          'ico' => 'image/x-icon',
          'ics' => 'text/calendar',
          'ini' => 'text/plain',
          'iso' => 'application/x-iso9660-image',
          'jar' => 'application/java-archive',
          'jpe' => 'image/jpeg',
          'jpeg' => 'image/jpeg',
          'jpg' => 'image/jpeg',
          'js' => 'text/javascript',
          'json' => 'application/json',
          'latex' => 'application/x-latex',
          'log' => 'text/plain',
          'm4a' => 'audio/mp4',
          'm4v' => 'video/mp4',
          'mid' => 'audio/midi',
          'midi' => 'audio/midi',
          'mov' => 'video/quicktime',
          'mp3' => 'audio/mpeg',
          'mp4' => 'video/mp4',
          'mp4a' => 'audio/mp4',
          'mp4v' => 'video/mp4',
          'mpe' => 'video/mpeg',
          'mpeg' => 'video/mpeg',
          'mpg' => 'video/mpeg',
          'mpg4' => 'video/mp4',
          'oga' => 'audio/ogg',
          'ogg' => 'audio/ogg',
          'ogv' => 'video/ogg',
          'ogx' => 'application/ogg',
          'pbm' => 'image/x-portable-bitmap',
          'pdf' => 'application/pdf',
          'pgm' => 'image/x-portable-graymap',
          'png' => 'image/png',
          'pnm' => 'image/x-portable-anymap',
          'ppm' => 'image/x-portable-pixmap',
          'ppt' => 'application/vnd.ms-powerpoint',
          'pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
          'ps' => 'application/postscript',
          'qt' => 'video/quicktime',
          'rar' => 'application/x-rar-compressed',
          'ras' => 'image/x-cmu-raster',
          'rss' => 'application/rss+xml',
          'rtf' => 'application/rtf',
          'sgm' => 'text/sgml',
          'sgml' => 'text/sgml',
          'svg' => 'image/svg+xml',
          'swf' => 'application/x-shockwave-flash',
          'tar' => 'application/x-tar',
          'tif' => 'image/tiff',
          'tiff' => 'image/tiff',
          'torrent' => 'application/x-bittorrent',
          'ttf' => 'application/x-font-ttf',
          'txt' => 'text/plain',
          'wav' => 'audio/x-wav',
          'webm' => 'video/webm',
          'webp' => 'image/webp',
          'wma' => 'audio/x-ms-wma',
          'wmv' => 'video/x-ms-wmv',
          'woff' => 'application/x-font-woff',
          'wsdl' => 'application/wsdl+xml',
          'xbm' => 'image/x-xbitmap',
          'xls' => 'application/vnd.ms-excel',
          'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
          'xml' => 'application/xml',
          'xpm' => 'image/x-xpixmap',
          'xwd' => 'image/x-xwindowdump',
          'yaml' => 'text/yaml',
          'yml' => 'text/yaml',
          'zip' => 'application/zip',
        ];

        $extension = strtolower( $extension );

        return isset( $mimetypes[ $extension ] ) ? $mimetypes[ $extension ] : false;
      }

      /**
       * Check using wildcards
       * @return bool
       */
      public static function is_use_wildcards() {
        return isset( $_REQUEST[ 'use_wildcards' ] ) ? $_REQUEST[ 'use_wildcards' ] : false;
      }

      /**
       * @param $size
       * @return float|int
       */
      public static function convert_to_byte($size) {
        $lastCharacter = \substr($size, -1);
        $base = \strtoupper($lastCharacter);
        if (!\ctype_digit($lastCharacter)) {
          switch ($base) {
            case 'B':
              $size = (int) $size;
              break;
            case 'K':
              $size = (int) $size * 1024;
              break;
            case 'M':
              $size = (int) $size * pow(1024, 2);
              break;
            case 'G':
              $size = (int) $size * pow(1024, 3);
              break;
          }
        }
        return $size;
      }

      /**
       * Get stateless data, count of stateless media
       * @return mixed
       */
      public static function get_stateless_media_data_count() {
        global $wpdb;

        $stateless_media = $wpdb->get_var($wpdb->prepare("
            SELECT COUNT(meta_id)
            FROM ".$wpdb->postmeta."
            WHERE meta_key = %s
          ", 'sm_cloud'));

        return $stateless_media;
      }
    }
  }
}