ries->get_allowed_countries() ),
				]
			);
		}

		if ( $needs_shipping ) {
			$this->validate_address_fields( $shipping_address, 'shipping', $errors );
		}
		$this->validate_address_fields( $billing_address, 'billing', $errors );

		if ( ! $errors->has_errors() ) {
			return;
		}

		$errors_by_code = [];
		$error_codes    = $errors->get_error_codes();
		foreach ( $error_codes as $code ) {
			$errors_by_code[ $code ] = $errors->get_error_messages( $code );
		}

		// Surface errors from first code.
		foreach ( $errors_by_code as $code => $error_messages ) {
			throw new RouteException(
				'woocommerce_rest_invalid_address',
				sprintf(
					/* translators: %s Address type. */
					__( 'There was a problem with the provided %s:', 'woocommerce' ) . ' ' . implode( ', ', $error_messages ),
					'shipping' === $code ? __( 'shipping address', 'woocommerce' ) : __( 'billing address', 'woocommerce' )
				),
				400,
				[
					'errors' => $errors_by_code,
				]
			);
		}
	}

	/**
	 * Check all required address fields are set and return errors if not.
	 *
	 * @param string $country Country code.
	 * @param array  $allowed_countries List of valid country codes.
	 * @return boolean True if valid.
	 */
	protected function validate_allowed_country( $country, array $allowed_countries ) {
		return array_key_exists( $country, $allowed_countries );
	}

	/**
	 * Check all required address fields are set and return errors if not.
	 *
	 * @param array     $address Address array.
	 * @param string    $address_type billing or shipping address, used in error messages.
	 * @param \WP_Error $errors Error object.
	 */
	protected function validate_address_fields( $address, $address_type, \WP_Error $errors ) {
		$all_locales    = wc()->countries->get_country_locale();
		$current_locale = isset( $all_locales[ $address['country'] ] ) ? $all_locales[ $address['country'] ] : [];

		/**
		 * We are not using wc()->counties->get_default_address_fields() here because that is filtered. Instead, this array
		 * is based on assets/js/base/components/cart-checkout/address-form/default-address-fields.js
		 */
		$address_fields = [
			'first_name' => [
				'label'    => __( 'First name', 'woocommerce' ),
				'required' => true,
			],
			'last_name'  => [
				'label'    => __( 'Last name', 'woocommerce' ),
				'required' => true,
			],
			'company'    => [
				'label'    => __( 'Company', 'woocommerce' ),
				'required' => false,
			],
			'address_1'  => [
				'label'    => __( 'Address', 'woocommerce' ),
				'required' => true,
			],
			'address_2'  => [
				'label'    => __( 'Apartment, suite, etc.', 'woocommerce' ),
				'required' => false,
			],
			'country'    => [
				'label'    => __( 'Country/Region', 'woocommerce' ),
				'required' => true,
			],
			'city'       => [
				'label'    => __( 'City', 'woocommerce' ),
				'required' => true,
			],
			'state'      => [
				'label'    => __( 'State/County', 'woocommerce' ),
				'required' => true,
			],
			'postcode'   => [
				'label'    => __( 'Postal code', 'woocommerce' ),
				'required' => true,
			],
		];

		if ( $current_locale ) {
			foreach ( $current_locale as $key => $field ) {
				if ( isset( $address_fields[ $key ] ) ) {
					$address_fields[ $key ]['label']    = isset( $field['label'] ) ? $field['label'] : $address_fields[ $key ]['label'];
					$address_fields[ $key ]['required'] = isset( $field['required'] ) ? $field['required'] : $address_fields[ $key ]['required'];
				}
			}
		}

		foreach ( $address_fields as $address_field_key => $address_field ) {
			if ( empty( $address[ $address_field_key ] ) && $address_field['required'] ) {
				/* translators: %s Field label. */
				$errors->add( $address_type, sprintf( __( '%s is required', 'woocommerce' ), $address_field['label'] ), $address_field_key );
			}
		}
	}

	/**
	 * Check email restrictions of a coupon against the order.
	 *
	 * @throws Exception Exception if invalid data is detected.
	 * @param \WC_Coupon $coupon Coupon object applied to the cart.
	 * @param \WC_Order  $order Order object.
	 */
	protected function validate_coupon_email_restriction( \WC_Coupon $coupon, \WC_Order $order ) {
		$restrictions = $coupon->get_email_restrictions();

		if ( ! empty( $restrictions ) && $order->get_billing_email() && ! wc()->cart->is_coupon_emails_allowed( [ $order->get_billing_email() ], $restrictions ) ) {
			throw new Exception( $coupon->get_coupon_error( \WC_Coupon::E_WC_COUPON_NOT_YOURS_REMOVED ) );
		}
	}

	/**
	 * Check usage restrictions of a coupon against the order.
	 *
	 * @throws Exception Exception if invalid data is detected.
	 * @param \WC_Coupon $coupon Coupon object applied to the cart.
	 * @param \WC_Order  $order Order object.
	 */
	protected function validate_coupon_usage_limit( \WC_Coupon $coupon, \WC_Order $order ) {
		$coupon_usage_limit = $coupon->get_usage_limit_per_user();

		if ( $coupon_usage_limit > 0 ) {
			$data_store  = $coupon->get_data_store();
			$usage_count = $order->get_customer_id() ? $data_store->get_usage_by_user_id( $coupon, $order->get_customer_id() ) : $data_store->get_usage_by_email( $coupon, $order->get_billing_email() );

			if ( $usage_count >= $coupon_usage_limit ) {
				throw new Exception( $coupon->get_coupon_error( \WC_Coupon::E_WC_COUPON_USAGE_LIMIT_REACHED ) );
			}
		}
	}

	/**
	 * Changes default order status to draft for orders created via this API.
	 *
	 * @return string
	 */
	public function default_order_status() {
		return 'checkout-draft';
	}

	/**
	 * Create order line items.
	 *
	 * @param \WC_Order $order The order object to update.
	 */
	protected function update_line_items_from_cart( \WC_Order $order ) {
		$cart_controller = new CartController();
		$cart            = $cart_controller->get_cart_instance();
		$cart_hashes     = $cart_controller->get_cart_hashes();

		if ( $order->get_cart_hash() !== $cart_hashes['line_items'] ) {
			$order->set_cart_hash( $cart_hashes['line_items'] );
			$order->remove_order_items( 'line_item' );
			wc()->checkout->create_order_line_items( $order, $cart );
		}

		if ( $order->get_meta_data( '_shipping_hash' ) !== $cart_hashes['shipping'] ) {
			$order->update_meta_data( '_shipping_hash', $cart_hashes['shipping'] );
			$order->remove_order_items( 'shipping' );
			wc()->checkout->create_order_shipping_lines( $order, wc()->session->get( 'chosen_shipping_methods' ), wc()->shipping()->get_packages() );
		}

		if ( $order->get_meta_data( '_coupons_hash' ) !== $cart_hashes['coupons'] ) {
			$order->remove_order_items( 'coupon' );
			$order->update_meta_data( '_coupons_hash', $cart_hashes['coupons'] );
			wc()->checkout->create_order_coupon_lines( $order, $cart );
		}

		if ( $order->get_meta_data( '_fees_hash' ) !== $cart_hashes['fees'] ) {
			$order->update_meta_data( '_fees_hash', $cart_hashes['fees'] );
			$order->remove_order_items( 'fee' );
			wc()->checkout->create_order_fee_lines( $order, $cart );
		}

		if ( $order->get_meta_data( '_taxes_hash' ) !== $cart_hashes['taxes'] ) {
			$order->update_meta_data( '_taxes_hash', $cart_hashes['taxes'] );
			$order->remove_order_items( 'tax' );
			wc()->checkout->create_order_tax_lines( $order, $cart );
		}
	}

	/**
	 * Update address data from cart and/or customer session data.
	 *
	 * @param \WC_Order $order The order object to update.
	 */
	protected function update_addresses_from_cart( \WC_Order $order ) {
		$customer_billing = wc()->customer->get_billing();
		$customer_billing = array_combine(
			array_map(
				function( $key ) {
					return 'billing_' . $key;
				},
				array_keys( $customer_billing )
			),
			$customer_billing
		);
		$order->set_props( $customer_billing );

		$customer_shipping = wc()->customer->get_shipping();
		$customer_shipping = array_combine(
			array_map(
				function( $key ) {
					return 'shipping_' . $key;
				},
				array_keys( $customer_shipping )
			),
			$customer_shipping
		);
		$order->set_props( $customer_shipping );
	}
}