[Forminator Pro] - Calculations with WooCommerce product

wpmudev-forminator-woo-price-calculations.php

<?php
/**
* Plugin Name: [Forminator Pro] - Calculations with WooCommerce product
* Plugin URI: https://premium.wpmudev.org/
* Description: Make calculations with a product's data on front-end (as of 1.12.1.1)
* Author: Alessandro Kaounas @ WPMUDEV
* Author URI: https://premium.wpmudev.org/
* Task: 0/11289012348292/1170321580851097
* License: GPLv2 or later
*/

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

// No need to do anything if the request is via WP-CLI.
if ( defined( 'WP_CLI' ) && WP_CLI ) {
	return;
}

if ( ! class_exists( 'WPMUDEV_Forminator_Woo_Price_Calculations' ) ) {
    
    class WPMUDEV_Forminator_Woo_Price_Calculations {

        // User defined variables
        private $form_id = '528';
        private $field_number = 'number-1';
        private $field_select = 'select-1';
        private $price_cap = '200';

        private static $_instance = null;

        public static function get_instance() {

            if( is_null( self::$_instance ) ){
                self::$_instance = new WPMUDEV_Forminator_Woo_Price_Calculations();
            }

            return self::$_instance;
            
        }

        private function __construct() {

            if ( ! class_exists( 'WooCommerce' ) || ! defined( 'FORMINATOR_VERSION' ) || FORMINATOR_VERSION < '1.12' ) {
                return;
            }

            $this->init();

        }

        private function init(){
            
            // Show form as 'Installments' tabs on product
            add_filter( 'woocommerce_product_tabs', array( $this, 'wpmudev_woocommerce_product_tabs' ), 20 );

            // Show form after woocommerce_template_single_excerpt() (Priority: 20)
            add_action( 'woocommerce_single_product_summary', array( $this, 'woocommerce_product_installments_tab' ), 30 );

            // Forminator render hooks
            add_action( 'forminator_before_form_render', array( $this, 'wpmudev_forminator_before_form_render' ) );

            // Forminator prevent submit hook
            add_filter( 'forminator_custom_form_submit_errors', array( $this, 'wpmudev_forminator_custom_form_submit_errors' ), 10, 3 );

        }

        public function wpmudev_forminator_custom_form_submit_errors( $submit_errors, $form_id, $field_data_array ){
            
            if ( $this->form_id != $form_id ){
                return $submit_errors;
            }
            
            // In case of submission return an error message
            if( wp_doing_ajax() ){
                $response = array(
                    'success'   =>  true,
                    'behav'     =>  null,
                    'message'   =>  __( "Error: This form can not be submitted!", 'wpmudev' ),
                );
                wp_send_json_error( $response );
            }else{
                add_filter( 'forminator_custom_form_invalid_form_message', function( $message, $id ){
                    return __( "Error: This form can not be submitted!", 'wpmudev' );
                }, 10, 2);
            }

            return $submit_errors;

        }

        public function wpmudev_forminator_before_form_render( $form_id ){

            if ( $this->form_id != $form_id ){
                return;
            }

            // Fill hidden input with product price
            add_filter( 'forminator_field_markup', array( $this, 'wpmudev_forminator_field_markup' ), 10, 2 );

            // Remove submit button from form
            add_filter( 'forminator_render_form_submit_markup', '__return_empty_string' );

        }

        public function wpmudev_forminator_field_markup( $html, $field ){

            if( $field['element_id'] === $this->field_number ){

                global $product;

                if( $product->get_price() ){
                    $html = str_replace( 'value="' . $field['default_value'] . '"', 'value="' . $product->get_price() .'" disabled="disabled"', $html );
                }
                
                $html = str_replace( 'class="forminator-field', ' style="display: none;" class="forminator-field', $html );

            }

            if( $field['element_id'] === $this->field_select ){

                global $product;

                if( $product->get_price() > $this->price_cap ){
                    $html = str_replace( '</select>', '<option value="24" data-calculation="24">24</option></select>', $html );
                }

            }
            
            return $html;
        
        }

        public function wpmudev_woocommerce_product_tabs( $tabs ){
    
            $tabs['installments'] = array(
                'title'    => __( 'Installments', 'woocommerce' ),
                'priority' => 10,
                'callback' => array( $this, 'woocommerce_product_installments_tab' ),
            );
            
            return $tabs;
        
        }

        public function woocommerce_product_installments_tab(){ ?>
            <h2><?php _e( 'Installments', 'woocommerce' ); ?></h2>
            <?php echo do_shortcode( '[forminator_form id="' . $this->form_id . '"]' ); ?>
        <?php }
		
    }

    add_action( 'plugins_loaded', function(){
        return WPMUDEV_Forminator_Woo_Price_Calculations::get_instance();
    });

}