Product_Review_Handler

class Product_Review_Handler implements Form_Handler {
	const ACTION = 'product-review';
	/**
	 * @var CatalogApi
	 */
	private $api;

	/**
	 * Product_Review_Handler constructor.
	 *
	 * @param CatalogApi $api
	 */
	public function __construct( CatalogApi $api ) {
		$this->api = $api;
	}

	public function handle_request( $submission ) {

		if ( ! $this->should_handle_request( $submission ) ) {
			return;
		}

		$errors = $this->validate_submission( $submission );

		if ( count( $errors->get_error_codes() ) > 0 ) {

			/**
			 * Triggered when a form has errors that prevent completion.
			 *
			 * @param \WP_Error $errors     The message that will display to the user
			 * @param array     $submission The data submitted to the form
			 */
			do_action( 'bigcommerce/form/error', $errors, $submission );

			return;
		}

		$product    = new Product( (int) $submission['bc-review']['post_id'] );
		$product_id = $product->bc_id();

		$review_request = new ProductReviewPost( [
			'title'         => sanitize_text_field( $submission['bc-review']['subject'] ),
			'text'          => sanitize_textarea_field( $submission['bc-review']['content'] ),
			/**
			 * Filters review status in form.
			 *
			 * @param string $status Status.
			 */
			'status'        => apply_filters( 'bigcommerce/form/review/status', 'pending', $submission, $product_id ),
			'rating'        => intval( $submission['bc-review']['rating'] ),
			'email'         => sanitize_email( $submission['bc-review']['email'] ),
			'name'          => sanitize_text_field( $submission['bc-review']['name'] ),
			'date_reviewed' => new \DateTime(),
		] );

		try {
			$response = $this->api->createProductReview( $product_id, $review_request );
		} catch ( ApiException $e ) {
			$errors->add( 'api_error', __( 'There was an error saving your review. Please try again.', 'bigcommerce' ) );
			do_action( 'bigcommerce/form/error', $errors, $submission );

			return;
		}

		/**
		 * Filters review form created message.
		 *
		 * @param string $message Message.
		 */
		$message = apply_filters( 'bigcommerce/form/review/created_message', __( 'Thank you for your review! It has been successfully submitted and is pending.', 'bigcommerce' ) );
		do_action( 'bigcommerce/form/success', $message, $submission, null );
	}

	private function should_handle_request( $submission ) {
		if ( empty( $submission['bc-action'] ) || $submission['bc-action'] !== self::ACTION ) {
			return false;
		}
		if ( empty( $submission['_wpnonce'] ) || empty( $submission['bc-review'] ) || empty( $submission['bc-review']['post_id'] ) ) {
			return false;
		}

		/**
		 * This filter is documented in src/BigCommerce/Templates/Product_Reviews.php
		 */
		if ( ! apply_filters( 'bigcommerce/product/reviews/show_form', is_user_logged_in(), $submission['bc-review']['post_id'] ) ) {
			return false;
		}

		return true;
	}

	private function validate_submission( $submission ) {
		$errors = new \WP_Error();

		if ( ! wp_verify_nonce( $submission['_wpnonce'], self::ACTION . $submission['bc-review']['post_id'] ) ) {
			$errors->add( 'invalid_nonce', __( 'There was an error validating your request. Please try again.', 'bigcommerce' ) );
		}

		if ( empty( $submission['bc-review']['rating'] ) || intval( $submission['bc-review']['rating'] ) < 1 ) {
			$errors->add( 'rating', __( 'Please select a rating.', 'bigcommerce' ) );
		}
		if ( empty( $submission['bc-review']['name'] ) ) {
			$errors->add( 'name', __( 'Name is required.', 'bigcommerce' ) );
		}
		if ( empty( $submission['bc-review']['email'] ) ) {
			$errors->add( 'email', __( 'Email Address is required.', 'bigcommerce' ) );
		} elseif ( ! is_email( $submission['bc-review']['email'] ) ) {
			$errors->add( 'email', __( 'Please verify that you have submitted a valid email address.', 'bigcommerce' ) );
		}
		if ( empty( $submission['bc-review']['subject'] ) ) {
			$errors->add( 'subject', __( 'Please give your review a subject.', 'bigcommerce' ) );
		}
		if ( empty( $submission['bc-review']['content'] ) ) {
			$errors->add( 'content', __( 'Please add comments to your review.', 'bigcommerce' ) );
		}

		/**
		 * Filters update review form errors.
		 *
		 * @param \WP_Error $errors     WP error.
		 * @param array     $submission Submitted data.
		 */
		$errors = apply_filters( 'bigcommerce/form/review/errors', $errors, $submission );

		return $errors;
	}

	/**
	 * Do not show product review form error/success messages above
	 * the post content. They will be rendered with the form.
	 *
	 * @param bool $show
	 * @param int  $post_id
	 *
	 * @return bool
	 *
	 * @filter bigcommerce/forms/show_messages
	 */
	public function remove_form_messages_from_post_content( $show, $post_id ) {
		$data       = [];
		$bc_error   = filter_var_array( $_REQUEST, [ Error_Handler::PARAM => FILTER_SANITIZE_STRING ] );
		$bc_success = filter_var_array( $_REQUEST, [ Success_Handler::PARAM => FILTER_SANITIZE_STRING ] );

		if ( $bc_error[ Error_Handler::PARAM ] ) {
			$data = get_transient( $bc_error[ Error_Handler::PARAM ] );
		} elseif ( $bc_success[ Success_Handler::PARAM ] ) {
			$data = get_transient( $bc_success[ Success_Handler::PARAM ] );
		}

		if ( $data && array_key_exists( 'submission', $data ) ) {
			if ( array_key_exists( 'bc-action', $data['submission'] ) ) {
				if ( $data['submission']['bc-action'] == self::ACTION ) {
					return false;
				}
			}
		}

		return $show;
	}

	/**
	 * If comments are disabled for a product, disable the review form
	 *
	 * @param bool $enabled
	 * @param int  $post_id
	 *
	 * @return bool
	 * @filter bigcommerce/product/reviews/show_form
	 */
	public function disable_reviews_if_comments_disabled( $enabled, $post_id ) {
		if ( ! $enabled ) {
			return $enabled; // don't enable it
		}

		return comments_open( $post_id );
	}
}