Enable margin on GP ecommerce discount field

gp-enable-margin-on-discount.php

<?php
/*
Plugin Name: GP Ecommerce Margin
Plugin URI: https://figarts.co
*/

/** You may noe start coding! **/

class GPECF_Margins {
	private static $instance = null;
	public static function get_instance() {
		if( null == self::$instance ) {
			self::$instance = new self;
		}
		return self::$instance;
  }

	private function __construct() {
		add_action( 'init', array( $this, 'hooks' ) );
  }

	public function hooks() {
		add_filter( 'gform_register_init_scripts', array( $this, 'register_init_script' ) );
		add_filter( 'gform_field_content', array( $this, 'add_margin_attribute' ), 10, 5 );
    add_action( 'gpecf_discount_total',  array( $this, 'filter_discount_as_margin' ), 10, 2 );
    add_action( 'gform_field_standard_settings', array( $this, 'gf_add_custom_field' ), 10,  2);
    add_action('gform_editor_js', array($this, 'editor_script'), 11, 2);
  }

	public function register_init_script( $form ) {
		if( ! gp_ecommerce_fields()->has_ecommerce_field( $form ) ) {
			return;
    }

    $script = '(function($){' .
      'gform.addFilter( "gpecf_discount_total", function( discount, $field ) {
				if( $field.data( "enablemargin" ) == 1 ) {
          discount *= -1;
        }
        // alert(discount);
        return discount;
			} );' .
    '})(jQuery);';


		// $script = ;
		GFFormDisplay::add_init_script( $form['id'], 'gpecf_margins', GFFormDisplay::ON_PAGE_RENDER, $script );
  }

	public function add_margin_attribute( $content, $field, $value, $entry_id, $form_id ) {
		if( $field->is_form_editor() || $field->is_entry_detail() || $field->type !== 'discount' ) {
			return $content;
    }

    $margins_enabled = rgobj( $field, 'marginField' );
    if ($margins_enabled == true)  $margins_enabled = 1;
		$search = "name='input_{$field->id}'";
		$replace = sprintf( "%s data-enableMargin='%d'", $search, $margins_enabled );
		$content = str_replace( $search, $replace, $content );
		return $content;
  }

	public function filter_discount_as_margin( $discount, $field ) {
		if( $field->type == 'discount' && $field->marginField ) {
			$discount *= -1;
		}
		return $discount;
  }

  public function gf_add_custom_field( $position, $form_id )
  {
    if ($position == 20) {
      // retrieve the data earlier stored in the database or create it
      ?>

      <li class="margin_setting field_setting">
        <input type="checkbox" id="margin_field" value="1" onclick="SetFieldProperty( 'marginField', this.checked);">
        <label class="inline" for="margin_field">
        <?php esc_html_e( 'Enable Margin' );
          //form_tooltip( 'my-custom-setting-toolip' ); ?>
        </label>
      </li>

      <?php
    }
  }

  public function editor_script() {
   ?>
    <script type="text/javascript">
    (function($) {
      $(document).bind( 'gform_load_field_settings', function( event, field, form ) {
      // populates the stored value from the field back into the setting when the field settings are loaded
      $( '#margin_field' ).attr( 'checked', field['marginField'] == true );

      // if our desired condition is met, we show the field setting; otherwise, hide it
      if( GetInputType( field ) == 'discount' ) {
        $( '.margin_setting' ).show();
      } else {
        $( '.margin_setting' ).hide();
      }
      } );
    })(jQuery);
    </script>
  <?php
  }

}
function gpecf_margins() {
	return GPECF_Margins::get_instance();
}
gpecf_margins();