class Inventory_Presser_WPForms extends Inventory_Presser_Forms_Integration {

		/**
		 * Adds hooks and registers a field type that power our WPForms integration.
		 *
		 * @return void
		 */
		public function add_hooks() {
			add_filter( 'wpforms_smart_tags', array( $this, 'smart_tags_register' ), 10, 1 );
			add_filter( 'wpforms_smart_tag_process', array( $this, 'smart_tags_process' ), 10, 2 );

			// No hook because this add_hooks() method is called at plugins_loaded hook.
			if ( ! class_exists( 'WPForms_Field' ) || ! empty( $this->field_instance ) ) {
				return;
			}
			include_once plugin_dir_path( INVP_PLUGIN_FILE_PATH ) . 'includes/integrations/class-wpforms-field-vehicle.php';
			$this->field_instance = new WPForms_Field_Vehicle();

			// Add our field type to the list of allowed fields in wpforms_get_form_fields().
			add_filter( 'wpforms_get_form_fields_allowed', array( $this, 'add_field_types' ) );
		}

		/**
		 * Adds our field type to the list of field types WPForms recognizes as
		 * valid.
		 *
		 * @param  array $allowed_form_fields
		 * @return array
		 */
		public function add_field_types( $allowed_form_fields ) {
			$allowed_form_fields[] = 'vehicle';
			return $allowed_form_fields;
		}

		/**
		 * Creates the vehicle piece of an ADF XML lead.
		 *
		 * @return string
		 */
		protected function adf_vehicle_xml() {
			$form_post_id = intval( $_POST['wpforms']['id'] ?? '' );
			$fields       = wpforms_get_form_fields( $form_post_id );

			$field_id = 0;
			foreach ( $fields as $field ) {
				if ( 'vehicle' !== $field['type'] ) {
					continue;
				}
				$field_id = $field['id'];
				break;
			}

			if ( 0 === $field_id ) {
				return '';
			}

			$value   = sanitize_text_field( wp_unslash( $_POST['wpforms']['fields'][ $field_id ] ?? '' ) );
			$post_id = $this->extract_post_id_from_value( $value );

			if ( empty( $post_id ) ) {
				return '';
			}
			return sprintf(
				'<vehicle><id>%s</id><year>%s</year><make>%s</make><model>%s</model><vin>%s</vin><stock>%s</stock></vehicle>',
				INVP::get_meta( 'car_id', $post_id ),
				invp_get_the_year( $post_id ),
				invp_get_the_make( $post_id ),
				invp_get_the_model( $post_id ),
				invp_get_the_vin( $post_id ),
				invp_get_the_stock_number( $post_id )
			);
		}

		/**
		 * Register Smart Tags with the form builder.
		 *
		 * @link   https://wpforms.com/developers/how-to-create-a-custom-smart-tag/
		 *
		 * @param  array $tags
		 * @return array
		 */
		public function smart_tags_register( $tags ) {
			// Key is the tag, item is the tag name.
			foreach ( $this->tags() as $tag => $name ) {
				$tags[ $tag ] = $name;
			}
			return $tags;
		}

		/**
		 * Process the Smart Tags when rendering entries.
		 *
		 * @link   https://wpforms.com/developers/how-to-create-a-custom-smart-tag/
		 */
		public function smart_tags_process( $content, $tag ) {
			$our_tags = array_keys( $this->tags() );
			if ( ! in_array( $tag, $our_tags, true ) ) {
				return $content;
			}
			switch ( $tag ) {
				case 'invp_adf_vehicle':
					$content = str_replace( '{invp_adf_vehicle}', $this->adf_vehicle_xml(), $content );
					break;
				case 'invp_site_url':
					$content = str_replace( '{invp_site_url}', site_url(), $content );
					break;
			}
			return $content;
		}

		/**
		 * Returns an array of WP Forms Smart Tags we support.
		 *
		 * @return array
		 */
		protected function tags() {
			return array(
				'invp_adf_vehicle' => __( 'ADF XML Vehicle', 'inventory-presser' ),
				'invp_site_url'    => __( 'Site URL', 'inventory-presser' ),
			);
		}
	}