izes'][ $size_name ]->bytes   = $stats['sizes'][ $size_name ]->bytes + $existing_stats_size->bytes;
							$stats['sizes'][ $size_name ]->percent = $this->calculate_percentage( $stats['sizes'][ $size_name ], $existing_stats_size );
						}
					}
				}
			}

			// Sum Up all the stats.
			$stats = WP_Smush::get_instance()->core()->total_compression( $stats );

			// If there was any compression and there was no error in smushing.
			if ( isset( $stats['stats']['bytes'] ) && $stats['stats']['bytes'] >= 0 && ! $has_errors ) {
				/**
				 * Runs if the image smushing was successful
				 *
				 * @param int $id Image Id
				 *
				 * @param array $stats Smush Stats for the image
				 *
				 * @param array $meta Attachment meta.
				 */
				do_action( 'wp_smush_image_optimised', $id, $stats, $meta );
			}

			/**
			 * If webp is active and all images have been converted to webp set a flag to meta.
			 *
			 * @since 3.8.0
			 */
			if ( $should_convert_to_webp && false === $webp_has_error ) {
				$udir = WP_Smush::get_instance()->core()->mod->webp->get_upload_dir();
				// Use the relative path of the first webp image as a flag.
				$stats['webp_flag'] = substr( $webp_files[0], strlen( $udir['webp_path'] . '/' ) );
			}

			update_post_meta( $id, self::$smushed_meta_key, $stats );
		} else {
			/**
			 * If webp is active and some images have been converted to webp already delete those new webp files.
			 *
			 * @since 3.8.0
			 */
			if ( $should_convert_to_webp && 0 < count( $webp_files ) ) {
				foreach ( $webp_files as $webp_file ) {
					unlink( $webp_file );
				}
			}
		}

		unset( $stats );

		// Unset response.
		if ( ! empty( $response ) ) {
			unset( $response );
		}

		return $meta;
	}

	/**
	 * Calculate saving percentage from existing and current stats
	 *
	 * @param object|string $stats           Stats object.
	 * @param object|string $existing_stats  Existing stats object.
	 *
	 * @return float
	 */
	public function calculate_percentage( $stats = '', $existing_stats = '' ) {
		if ( empty( $stats ) || empty( $existing_stats ) ) {
			return 0;
		}
		$size_before = ! empty( $stats->size_before ) ? $stats->size_before : $existing_stats->size_before;
		$size_after  = ! empty( $stats->size_after ) ? $stats->size_after : $existing_stats->size_after;
		$savings     = $size_before - $size_after;
		if ( $savings > 0 ) {
			$percentage = ( $savings / $size_before ) * 100;
			$percentage = $percentage > 0 ? round( $percentage, 2 ) : $percentage;

			return $percentage;
		}

		return 0;
	}

	/**
	 * Read the image paths from an attachment's metadata and process each image with wp_smushit().
	 *
	 * @uses resize_from_meta_data
	 *
	 * @param array $meta  Attachment metadata.
	 * @param int   $id    Attachment ID.
	 *
	 * @return mixed
	 */
	public function smush_image( $meta, $id ) {
		// We need to check if this call originated from Gutenberg and allow only media.
		if ( ! empty( $GLOBALS['wp']->query_vars['rest_route'] ) ) {
			$route = untrailingslashit( $GLOBALS['wp']->query_vars['rest_route'] );

			// Only allow media routes.
			if ( empty( $route ) || '/wp/v2/media' !== $route ) {
				// If not - return image metadata.
				return $meta;
			}
		}

		$upload_attachment    = filter_input( INPUT_POST, 'action', FILTER_SANITIZE_STRING );
		$is_upload_attachment = 'upload-attachment' === $upload_attachment || isset( $_POST['post_id'] );

		// Our async task runs when action is upload-attachment and post_id found. So do not run on these conditions.
		if ( $is_upload_attachment && defined( 'WP_SMUSH_ASYNC' ) && WP_SMUSH_ASYNC ) {
			return $meta;
		}

		// Return directly if not a image.
		if ( ! wp_attachment_is_image( $id ) ) {
			return $meta;
		}

		// Check if we're restoring the image Or already smushing the image.
		if ( get_option( "wp-smush-restore-$id", false ) || get_option( "smush-in-progress-$id", false ) ) {
			return $meta;
		}

		/**
		 * Filter: wp_smush_image
		 *
		 * Whether to smush the given attachment id or not
		 *
		 * @param bool $skip  Bool, whether to Smush image or not.
		 * @param int  $ID    Attachment Id, Attachment id of the image being processed.
		 */
		if ( ! apply_filters( 'wp_smush_image', true, $id ) ) {
			return $meta;
		}

		// Set a transient to avoid multiple request.
		update_option( 'smush-in-progress-' . $id, true );

		// While uploading from Mobile App or other sources, admin_init action may not fire.
		// So we need to manually initialize those.
		WP_Smush::get_instance()->core()->mod->resize->initialize( true );

		// Check if auto is enabled.
		$auto_smush = $this->is_auto_smush_enabled();

		// Allow downloading the file from S3 all throughout the process.
		do_action( 'smush_s3_integration_fetch_file' );

		// Get the file path for backup.
		$attachment_file_path = get_attached_file( $id );

		Helper::check_animated_status( $attachment_file_path, $id );

		// Take backup.
		WP_Smush::get_instance()->core()->mod->backup->create_backup( $attachment_file_path, $id );

		// Optionally resize images.
		$meta = WP_Smush::get_instance()->core()->mod->resize->auto_resize( $id, $meta );

		// Auto Smush the new image.
		if ( $auto_smush ) {
			// Optionally convert PNGs to JPG.
			$meta = WP_Smush::get_instance()->core()->mod->png2jpg->png_to_jpg( $id, $meta );

			/**
			 * Fix for Hostgator.
			 * Check for use of http url (Hostgator mostly).
			 */
			$use_http = wp_cache_get( WP_SMUSH_PREFIX . 'use_http', 'smush' );
			if ( ! $use_http ) {
				$use_http = $this->settings->get_setting( WP_SMUSH_PREFIX . 'use_http', false );
				wp_cache_add( WP_SMUSH_PREFIX . 'use_http', $use_http, 'smush' );
			}

			if ( $use_http ) {
				define( 'WP_SMUSH_API_HTTP', 'http://smushpro.wpmudev.org/1.0/' );
			}

			$this->resize_from_meta_data( $meta, $id );
		} else {
			// Remove the smush metadata.
			delete_post_meta( $id, self::$smushed_meta_key );
		}

		// Delete transient.
		delete_option( 'smush-in-progress-' . $id );

		return $meta;
	}

	/**
	 * Smush single images
	 *
	 * @param int  $attachment_id  Attachment ID.
	 * @param bool $return         Return/echo the stats.
	 *
	 * @return array|string
	 */
	public function smush_single( $attachment_id, $return = false ) {
		// If the smushing option is already set, return the status.
		if ( get_option( "smush-in-progress-{$attachment_id}", false ) || get_option( "wp-smush-restore-{$attachment_id}", false ) ) {
			// Get the button status.
			$status = WP_Smush::get_instance()->library()->generate_markup( $attachment_id );
			if ( $return ) {
				return $status;
			}

			wp_send_json_success( $status );
		}

		// Set a transient to avoid multiple request.
		update_option( "smush-in-progress-{$attachment_id}", true );

		$attachment_id = absint( (int) $attachment_id );

		// Allow downloading the file from S3 all throughout the process.
		do_action( 'smush_s3_integration_fetch_file' );

		// Get the file path for backup.
		$attachment_file_path = get_attached_file( $attachment_id );

		Helper::check_animated_status( $attachment_file_path, $attachment_id );

		// Take backup.
		WP_Smush::get_instance()->core()->mod->backup->create_backup( $attachment_file_path, $attachment_id );

		// Get the image metadata from $_POST.
		$original_meta = ! empty( $_POST['metadata'] ) ? Helper::format_meta_from_post( $_POST['metadata'] ) : '';

		$original_meta = empty( $original_meta ) ? wp_get_attachment_metadata( $attachment_id ) : $original_meta;

		// Send image for resizing, if enabled resize first before any other operation.
		$updated_meta = $this->resize_image( $attachment_id, $original_meta );

		// Convert PNGs to JPG.
		$updated_meta = WP_Smush::get_instance()->core()->mod->png2jpg->png_to_jpg( $attachment_id, $updated_meta );

		$original_meta = ! empty( $updated_meta ) ? $updated_meta : $original_meta;

		// Smush the image.
		$smush = $this->resize_from_meta_data( $original_meta, $attachment_id );

		/**
		 * When S3 integration is enabled, the wp_update_attachment_metadata below will trigger the
		 * wp_update_attachment_metadata filter WP Offload Media, which in turn will try to re-upload all the files
		 * to an S3 bucket. But, if some sizes are skipped during Smushing, WP Offload Media will print error
		 * messages to debug.log. This will help avoid that.
		 *
		 * @since 3.0
		 */
		add_filter( 'as3cf_attachment_file_paths', array( $this, 'remove_sizes_from_s3_upload' ), 10, 3 );

		// Update the details, after smushing, so that latest image is used in hook.
		wp_update_attachment_metadata( $attachment_id, $original_meta );

		// Delete the transient after attachment meta is updated.
		delete_option( 'smush-in-progress-' . $attachment_id );

		// Get the button status.
		$status = WP_Smush::get_instance()->library()->generate_markup( $attachment_id );

		// Send Json response if we are not suppose to return the results.
		if ( is_wp_error( $smush ) ) {
			if ( $return ) {
				return array( 'error' => $smush->get_error_message() );
			}

			wp_send_json_error(
				array(
					'error_msg'    => '<p class="wp-smush-error-message">' . Helper::filter_error( $smush->get_error_message(), $attachment_id ) . '</p>',
					'show_warning' => (int) $this->show_warning(),
				)
			);
		}

		$this->update_resmush_list( $attachment_id );
		\Smush\Core\Core::add_to_smushed_list( $attachment_id );
		if ( $return ) {
			return $status;
		}

		wp_send_json_success( $status );
	}

	/**
	 * Returns api key.
	 *
	 * @return mixed
	 */
	private function get_api_key() {
		$api_key = false;

		// If API key defined manually, get that.
		if ( defined( 'WPMUDEV_APIKEY' ) && WPMUDEV_APIKEY ) {
			$api_key = WPMUDEV_APIKEY;
		} elseif ( class_exists( 'WPMUDEV_Dashboard' ) ) {
			// If dashboard plugin is active, get API key from db.
			$api_key = get_site_option( 'wpmudev_apikey' );
		}

		return $api_key;
	}

	/**
	 * If auto smush is set to true or not, default is true
	 *
	 * @return int|mixed
	 */
	public function is_auto_smush_enabled() {
		$auto_smush = $this->settings->get( 'auto' );

		// Keep the auto smush on by default.
		if ( ! isset( $auto_smush ) ) {
			$auto_smush = 1;
		}

		return $auto_smush;
	}

	/**
	 * Deletes all the backup files when an attachment is deleted
	 * Update resmush List
	 * Update Super Smush image count
	 *
	 * @param int $image_id  Attachment ID.
	 *
	 * @return bool
	 */
	public function delete_images( $image_id ) {
		// Update the savings cache.
		WP_Smush::get_instance()->core()->get_savings( 'resize' );

		// Update the savings cache.
		WP_Smush::get_instance()->core()->get_savings( 'pngjpg' );

		// If no image id provided.
		if ( empty( $image_id ) ) {
			return false;
		}

		// Check and Update resmush list.
		$resmush_list = get_option( 'wp-smush-resmush-list' );
		if ( $resmush_list ) {
			$this->update_resmush_list( $image_id, 'wp-smush-resmush-list' );
		}

		/** Delete Backups  */
		// Check if we have any smush data for image.
		WP_Smush::get_instance()->core()->mod->backup->delete_backup_files( $image_id );

		/**
		 * Detete webp.
		 * Run WebP::delete_images always even when the module is deactivated.
		 * @since 3.8.0
		 */
		WP_Smush::get_instance()->core()->mod->webp->delete_images( $image_id , false );
	}

	/**
	 * Calculate saving percentage for a given size stats
	 *
	 * @param object $stats  Stats object.
	 *
	 * @return float|int
	 */
	private function calculate_percentage_from_stats( $stats ) {
		if ( empty( $stats ) || ! isset( $stats->size_before, $stats->size_after ) ) {
			return 0;
		}

		$savings = $stats->size_before - $stats->size_after;
		if ( $savings > 0 ) {
			$percentage = ( $savings / $stats->size_before ) * 100;
			$percentage = $percentage > 0 ? round( $percentage, 2 ) : $percentage;

			return $percentage;
		}

		return 0;
	}

	/**
	 * Perform the resize operation for the image
	 *
	 * @param int   $attachment_id  Attachment ID.
	 * @param array $meta           Attachment meta.
	 *
	 * @return mixed
	 */
	public function resize_image( $attachment_id, $meta ) {
		if ( empty( $attachment_id ) || empty( $meta ) ) {
			return $meta;
		}

		return WP_Smush::get_instance()->core()->mod->resize->auto_resize( $attachment_id, $meta );
	}

	/**
	 * Send a smush request for the attachment
	 *
	 * @param int $id  Attachment ID.
	 */
	public function wp_smush_handle_async( $id ) {
		// If we don't have image id, or the smush is already in progress for the image, return.
		if ( empty( $id ) || get_option( 'smush-in-progress-' . $id, false ) || get_option( "wp-smush-restore-$id", false ) ) {
			return;
		}

		// If auto Smush is disabled.
		if ( ! $this->is_auto_smush_enabled() ) {
			return;
		}

		/**
		 * Filter: wp_smush_image
		 *
		 * Whether to smush the given attachment id or not
		 *
		 * @param bool $skip  Whether to Smush image or not.
		 * @param int  $id    Attachment id of the image being processed.
		 */
		if ( ! apply_filters( 'wp_smush_image', true, $id ) ) {
			return;
		}

		$this->smush_single( $id, true );
	}

	/**
	 * Send a smush request for the attachment
	 *
	 * @param int   $id         Attachment ID.
	 * @param array $post_data  Post data.
	 */
	public function wp_smush_handle_editor_async( $id, $post_data ) {
		// If we don't have image id, or the smush is already in progress for the image, return.
		if ( empty( $id ) || get_option( "smush-in-progress-$id", false ) || get_option( "wp-smush-restore-$id", false ) ) {
			return;
		}

		// If auto Smush is disabled.
		if ( ! $this->is_auto_smush_enabled() ) {
			return;
		}

		/**
		 * Filter: wp_smush_image
		 *
		 * Whether to smush the given attachment id or not
		 *
		 * @param bool $skip  Whether to Smush image or not.
		 * @param int  $id    Attachment ID of the image being processed.
		 */
		if ( ! apply_filters( 'wp_smush_image', true, $id ) ) {
			return;
		}

		// If filepath is not set or file doesn't exists.
		if ( ! isset( $post_data['filepath'] ) || ! file_exists( $post_data['filepath'] ) ) {
			return;
		}

		// Send image for smushing.
		$res = $this->do_smushit( $post_data['filepath'] );

		// Exit if smushing wasn't successful.
		if ( is_wp_error( $res ) || empty( $res['success'] ) || ! $res['success'] ) {
			return;
		}

		// Update stats if it's the full size image.
		// Return if it's not the full image size.
		if ( $post_data['filepath'] != get_attached_file( $post_data['postid'] ) ) {
			return;
		}

		// Get the existing Stats.
		$smush_stats = get_post_meta( $post_data['postid'], self::$smushed_meta_key, true );
		$stats_full  = ! empty( $smush_stats['sizes'] ) && ! empty( $smush_stats['sizes']['full'] ) ? $smush_stats['sizes']['full'] : '';

		if ( empty( $stats_full ) ) {
			return;
		}

		// store the original image size.
		$stats_full->size_before = ( ! empty( $stats_full->size_before ) && $stats_full->size_before > $res['data']->before_size ) ? $stats_full->size_before : $res['data']->before_size;
		$stats_full->size_after  = $res['data']->after_size;

		// Update compression percent and bytes saved for each size.
		$stats_full->bytes = $stats_full->size_before - $stats_full->size_after;

		$stats_full->percent          = $this->calculate_percentage_from_stats( $stats_full );
		$smush_stats['sizes']['full'] = $stats_full;

		// Update stats.
		update_post_meta( $post_data['postid'], self::$smushed_meta_key, $smush_stats );
	}

	/**
	 * Remove paths that should not be re-uploaded to an S3 bucket.
	 *
	 * See as3cf_attachment_file_paths filter description for more information.
	 *
	 * @since 3.0
	 *
	 * @param array $paths          Paths to be uploaded to S3 bucket.
	 * @param int   $attachment_id  Attachment ID.
	 * @param array $meta           Image metadata.
	 *
	 * @return mixed
	 */
	public function remove_sizes_from_s3_upload( $paths, $attachment_id, $meta ) {
		// Only run when S3 integration is active. It won't run otherwise, but check just in case.
		if ( ! $this->settings->get( 's3' ) ) {
			return $paths;
		}

		foreach ( $meta['sizes'] as $size_key => $size_data ) {
			// Check if registered size is supposed to be Smushed or not.
			if ( 'full' !== $size_key && $this->skip_image_size( $size_key ) ) {
				unset( $paths[ $size_key ] );
			}
		}

		return $paths;
	}

}