public function import() {
		$this->start_time = time();
		$index            = 0;
		$update_existing  = $this->params['update_existing'];
		$data             = array(
			'imported' => array(),
			'failed'   => array(),
			'updated'  => array(),
			'skipped'  => array(),
		);

		foreach ( $this->parsed_data as $parsed_data_key => $parsed_data ) {
			do_action( 'woocommerce_product_import_before_import', $parsed_data );

			$id         = isset( $parsed_data['id'] ) ? absint( $parsed_data['id'] ) : 0;
			$sku        = isset( $parsed_data['sku'] ) ? $parsed_data['sku'] : '';
			$id_exists  = false;
			$sku_exists = false;

			if ( $id ) {
				$product   = wc_get_product( $id );
				$id_exists = $product && 'importing' !== $product->get_status();
			}

			if ( $sku ) {
				$id_from_sku = wc_get_product_id_by_sku( $sku );
				$product     = $id_from_sku ? wc_get_product( $id_from_sku ) : false;
				$sku_exists  = $product && 'importing' !== $product->get_status();
			}

			if ( $id_exists && ! $update_existing ) {
				$data['skipped'][] = new WP_Error(
					'woocommerce_product_importer_error',
					esc_html__( 'A product with this ID already exists.', 'woocommerce' ),
					array(
						'id'  => $id,
						'row' => $this->get_row_id( $parsed_data ),
					)
				);
				continue;
			}

			if ( $sku_exists && ! $update_existing ) {
				$data['skipped'][] = new WP_Error(
					'woocommerce_product_importer_error',
					esc_html__( 'A product with this SKU already exists.', 'woocommerce' ),
					array(
						'sku' => esc_attr( $sku ),
						'row' => $this->get_row_id( $parsed_data ),
					)
				);
				continue;
			}

			if ( $update_existing && ( isset( $parsed_data['id'] ) || isset( $parsed_data['sku'] ) ) && ! $id_exists && ! $sku_exists ) {
				$data['skipped'][] = new WP_Error(
					'woocommerce_product_importer_error',
					esc_html__( 'No matching product exists to update.', 'woocommerce' ),
					array(
						'id'  => $id,
						'sku' => esc_attr( $sku ),
						'row' => $this->get_row_id( $parsed_data ),
					)
				);
				continue;
			}

			$result = $this->process_item( $parsed_data );

			if ( is_wp_error( $result ) ) {
				$result->add_data( array( 'row' => $this->get_row_id( $parsed_data ) ) );
				$data['failed'][] = $result;
			} elseif ( $result['updated'] ) {
				$data['updated'][] = $result['id'];
			} else {
				$data['imported'][] = $result['id'];
			}

			$index ++;

			if ( $this->params['prevent_timeouts'] && ( $this->time_exceeded() || $this->memory_exceeded() ) ) {
				$this->file_position = $this->file_positions[ $index ];
				break;
			}
		}

		return $data;
	}