],
				'country'   => $package['destination']['country'],
			]
		);
	}

	/**
	 * Gets items from a package and creates an array of strings containing product names and quantities.
	 *
	 * @param array $package Shipping package complete with rates from WooCommerce.
	 * @return array
	 */
	protected function prepare_package_items_response( $package ) {
		$items = array();
		foreach ( $package['contents'] as $item_id => $values ) {
			$items[] = [
				'key'      => $item_id,
				'name'     => $values['data']->get_name(),
				'quantity' => $values['quantity'],
			];
		}
		return $items;
	}

	/**
	 * Prepare an array of rates from a package for the response.
	 *
	 * @param array $package Shipping package complete with rates from WooCommerce.
	 * @return array
	 */
	protected function prepare_package_shipping_rates_response( $package ) {
		$rates          = $package['rates'];
		$selected_rates = wc()->session->get( 'chosen_shipping_methods', array() );
		$selected_rate  = isset( $selected_rates[ $package['package_id'] ] ) ? $selected_rates[ $package['package_id'] ] : '';

		if ( empty( $selected_rate ) && ! empty( $package['rates'] ) ) {
			$selected_rate = wc_get_chosen_shipping_method_for_package( $package['package_id'], $package );
		}

		$response = [];

		foreach ( $package['rates'] as $rate ) {
			$response[] = $this->get_rate_response( $rate, $selected_rate );
		}

		return $response;
	}

	/**
	 * Response for a single rate.
	 *
	 * @param WC_Shipping_Rate $rate Rate object.
	 * @param string           $selected_rate Selected rate.
	 * @return array
	 */
	protected function get_rate_response( $rate, $selected_rate = '' ) {
		return $this->prepare_currency_response(
			[
				'rate_id'       => $this->get_rate_prop( $rate, 'id' ),
				'name'          => $this->prepare_html_response( $this->get_rate_prop( $rate, 'label' ) ),
				'description'   => $this->prepare_html_response( $this->get_rate_prop( $rate, 'description' ) ),
				'delivery_time' => $this->prepare_html_response( $this->get_rate_prop( $rate, 'delivery_time' ) ),
				'price'         => $this->prepare_money_response( $this->get_rate_prop( $rate, 'cost' ), wc_get_price_decimals() ),
				'taxes'         => $this->prepare_money_response( array_sum( $this->get_rate_prop( $rate, 'taxes' ) ), wc_get_price_decimals() ),
				'instance_id'   => $this->get_rate_prop( $rate, 'instance_id' ),
				'method_id'     => $this->get_rate_prop( $rate, 'method_id' ),
				'meta_data'     => $this->get_rate_meta_data( $rate ),
				'selected'      => $selected_rate === $this->get_rate_prop( $rate, 'id' ),
			]
		);
	}

	/**
	 * Gets a prop of the rate object, if callable.
	 *
	 * @param WC_Shipping_Rate $rate Rate object.
	 * @param string           $prop Prop name.
	 * @return string
	 */
	protected function get_rate_prop( $rate, $prop ) {
		$getter = 'get_' . $prop;
		return \is_callable( array( $rate, $getter ) ) ? $rate->$getter() : '';
	}

	/**
	 * Converts rate meta data into a suitable response object.
	 *
	 * @param WC_Shipping_Rate $rate Rate object.
	 * @return array
	 */
	protected function get_rate_meta_data( $rate ) {
		$meta_data = $rate->get_meta_data();

		return array_reduce(
			array_keys( $meta_data ),
			function( $return, $key ) use ( $meta_data ) {
				$return[] = [
					'key'   => $key,
					'value' => $meta_data[ $key ],
				];
				return $return;
			},
			[]
		);
	}
}