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<?php
/**
 * WARNING! THIS SNIPPET MAY BE OUTDATED.
 * The latest version of this snippet can be found in the Gravity Wiz Snippet Library:
 * https://github.com/gravitywiz/snippet-library/blob/master/gravity-forms/gw-simple-approval.php
 */
/**
 * Gravity Wiz // Gravity Forms // Simple Approval with Save and Continue
 *
 * Make use of Gravity Forms' Save and Continue functionality to send the incomplete form to another user for final
 * approval before submission.
 *
 * @version   1.1
 * @author    David Smith <david@gravitywiz.com>
 * @license   GPL-2.0+
 * @link      http://gravitywiz.com/...
 */
class GW_Simple_Approval {

    protected static $is_script_output = false;

    public function __construct( $args = array() ) {

        // set our default arguments, parse against the provided arguments, and store for use throughout the class
        $this->_args = wp_parse_args( $args, array(
            'form_id'              => false,
            'approve_button_label' => __( 'Approve' ),
            'approval_read_only'   => false
        ) );

        // do version check in the init to make sure if GF is going to be loaded, it is already loaded
        add_action( 'init', array( $this, 'init' ) );

    }

    function init() {

        // make sure we're running the required minimum version of Gravity Forms
        if( ! property_exists( 'GFCommon', 'version' ) || ! version_compare( GFCommon::$version, '1.9', '>=' ) ) {
            return;
        }

        // time for hooks
        add_filter( 'gform_register_init_scripts',        array( $this, 'add_init_script' ) );
        add_filter( 'gform_save_and_continue_resume_url', array( $this, 'add_approval_query_arg' ), 10, 4 );
        add_filter( 'gform_pre_render',                   array( $this, 'modify_frontend_form_object_for_approval' ) );

    }

    function add_init_script( $form ) {

        if( ! $this->is_applicable_form( $form ) ) {
            return;
        }

        $script = '
            ( function( $ ) {
                var $submitButton       = $( "#gform_submit_button_" + formId ),
                    $saveContinueButton = $( "#gform_save_" + formId + "_link" );

                if( $saveContinueButton.is( "a" ) ) {

                    var label = $saveContinueButton.html();
                    $saveContinueButton.html( "" );

                    var html = $( "<div />" ).append( $saveContinueButton.clone() ).html();

                    $saveContinueButton.replaceWith( html.replace( "<a", "<input type=\"submit\" value=\"" + label + "\"" ).replace( "</a>", "" ) );
                    $saveContinueButton.addClass( "gform_button button" );

                }

                if( $submitButton.is( ":visible" ) ) {
                    $saveContinueButton.hide();
                } else {
                    $saveContinueButton.show();
                }
            } )( jQuery );';

        $slug = 'gw_simple_approval';

        GFFormDisplay::add_init_script( $this->_args['form_id'], $slug, GFFormDisplay::ON_CONDITIONAL_LOGIC, $script );

    }

    function is_applicable_form( $form ) {

        $form_id = isset( $form['id'] ) ? $form['id'] : $form;

        return $form_id == $this->_args['form_id'];
    }

    function add_approval_query_arg( $resume_url, $form, $token, $email ) {

        if( ! $this->is_applicable_form( $form ) ) {
            return $resume_url;
        }

        // add query arg
        $resume_url = add_query_arg( array( 'gf_token' => $token, 'is_approval' => 1 ), $resume_url );

        return $resume_url;
    }

    function modify_frontend_form_object_for_approval( $form ) {

        if( ! $this->is_applicable_form( $form ) ) {
            return $form;
        }

        if( rgget( 'is_approval' ) ) {
            ?>

            <style type="text/css">
                form.gw-approval-mode .hide-in-approval-mode { display: none; }
            </style>

            <?php

            $form['cssClass'] .= 'gw-approval-mode';
            $form['save']['enabled'] = false;
            $form['button']['text'] = $this->_args['approve_button_label'];

            foreach( $form['fields'] as &$field ) {

                if( $field->inputName == 'is_approval' ) {
                    $field->defaultValue = 1;
                }

                if( $this->_args['approval_read_only'] ) {
                    $field->gwreadonly_enable = true;
                }

            }

        }

        return $form;
    }

}

# Configuration

new GW_Simple_Approval( array(
    'form_id'              => 59,
    'approve_button_label' => 'Approve Prayer Request',
    'approval_read_only'   => true // requires GP Read Only
) );