From 733d3ffd6e7ced1dae6193d7e9c00ddf297feab5 Mon Sep 17 00:00:00 2001
From: David Smith <david@gravitywiz.com>
Date: Thu, 17 Feb 2022 16:43:09 -0500
Subject: [PATCH] Create gpmpn-page-permalinks.php

---
 .../gpmpn-page-permalinks.php                 | 221 ++++++++++++++++++
 1 file changed, 221 insertions(+)
 create mode 100644 gp-multi-page-navigation/gpmpn-page-permalinks.php

diff --git a/gp-multi-page-navigation/gpmpn-page-permalinks.php b/gp-multi-page-navigation/gpmpn-page-permalinks.php
new file mode 100644
index 000000000..ed6dd4d33
--- /dev/null
+++ b/gp-multi-page-navigation/gpmpn-page-permalinks.php
@@ -0,0 +1,221 @@
+<?php
+/**
+ * Gravity Perks // Multi-page Navigation // Page Permalinks
+ * https://gravitywiz.com/documentation/gravity-forms-multi-page-navigation/
+ *
+ * Add permalinks for each page of your multi-page forms.
+ *
+ * Plugin Name:  GP Multi-page Navigation — Page Permalinks
+ * Plugin URI:   https://gravitywiz.com/documentation/gravity-forms-multi-page-navigation/
+ * Description:  Add permalinks for each page of your multi-page forms.
+ * Author:       Gravity Wiz
+ * Version:      0.1
+ * Author URI:   https://gravitywiz.com
+ */
+class GPMPN_Page_Permalinks {
+
+	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,
+			'permalinks' => array(),
+		) );
+
+		// 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' ) );
+
+	}
+
+	public function init() {
+
+		// @todo For some reason after this runs for newly added page permalinks, all post permalinks are broken
+		add_filter( 'option_rewrite_rules', array( $this, 'hotload_rewrite_rules' ) );
+		add_action( 'gpmpn_default_page', array( $this, 'set_default_form_page' ) );
+
+		add_filter( 'gform_pre_render', array( $this, 'load_form_script' ), 10, 2 );
+		add_filter( 'gform_register_init_scripts', array( $this, 'add_init_script' ), 10, 2 );
+
+		$this->add_query_var();
+		$this->add_rewrite_rules();
+
+	}
+
+	public function add_query_var() {
+		global $wp;
+		$wp->add_query_var( 'gpmpn_page' );
+	}
+
+	public function add_rewrite_rules() {
+		foreach ( $this->_args['permalinks'] as $page => $permalink ) {
+			add_rewrite_rule( "^{$this->_args['pagename']}/{$permalink}?", "index.php?pagename={$this->_args['pagename']}&gpmpn_page={$page}", 'top' );
+		}
+	}
+
+	public function hotload_rewrite_rules( $rules ) {
+		static $did_rewrite_rules;
+
+		if ( ! is_array( $rules ) ) {
+			$rules = array();
+		}
+
+		$needs_flush = false;
+
+		foreach ( $this->_args['permalinks'] as $page => $permalink ) {
+			if ( ! array_key_exists( "^{$this->_args['pagename']}/{$permalink}?", $rules ) ) {
+				$rules       = array( "^{$this->_args['pagename']}/{$permalink}?" => "index.php?pagename={$this->_args['pagename']}&gpmpn_page={$page}" ) + $rules;
+				$needs_flush = true;
+			}
+		}
+
+//		if ( $needs_flush ) {
+//			if ( ! $did_rewrite_rules ) {
+//				$did_rewrite_rules = true;
+//				$this->flush_rewrite_rules();
+//			}
+//		}
+
+		return $rules;
+	}
+
+	public function flush_rewrite_rules() {
+		global $wp_rewrite;
+		$wp_rewrite->flush_rules();
+	}
+
+	public function set_default_form_page( $page ) {
+		return get_query_var( 'gpmpn_page' );
+	}
+
+	public function load_form_script( $form, $is_ajax_enabled ) {
+
+		if ( $this->is_applicable_form( $form ) && ! has_action( 'wp_footer', array( $this, 'output_script' ) ) ) {
+			add_action( 'wp_footer', array( $this, 'output_script' ) );
+			add_action( 'gform_preview_footer', array( $this, 'output_script' ) );
+		}
+
+		return $form;
+	}
+
+	public function output_script() {
+		?>
+
+		<script type="text/javascript">
+
+			( function( $ ) {
+
+				window.GPMPNPagePermalinks = function( args ) {
+
+					var self = this;
+
+					self.history = [];
+
+					// copy all args to current object: (list expected props)
+					for( var prop in args ) {
+						if( args.hasOwnProperty( prop ) ) {
+							self[ prop ] = args[ prop ];
+						}
+					}
+
+					self.init = function() {
+
+						if ( typeof window[ 'GPMPNPagePermalinks_{0}'.format( self.formId ) ] !== 'undefined' ) {
+							return;
+						}
+
+						window[ 'GPMPNPagePermalinks_{0}'.format( self.formId ) ] = self;
+
+						self.history.push( { gpmpnPage: self.defaultPage } );
+
+						console.log( 'init', self.history );
+
+						$( document ).on( 'gform_page_loaded', function( event, formId, currentPage ) {
+							if ( formId == self.formId ) {
+								self.setPageState( currentPage );
+							}
+						} );
+
+						$( document ).on( 'gform_confirmation_loaded', function( event, formId ) {
+							if ( formId == self.formId ) {
+								self.setPageState( 0 );
+							}
+						} );
+
+						window.addEventListener( 'popstate', function ( event ) {
+							// @todo Update to navigate the form to correct page based on the path.
+							// var currentPage  = self.history.slice( -1 )[0].gpmpnPage;
+							// var previousPage = self.history.slice( -2 )[0].gpmpnPage;
+							// if ( previousPage < currentPage  ) {
+							// 	$( '.gform_previous_button:visible' ).click();
+							// }
+							// Temporary solution: reload first page when user uses browser's back/next buttons.
+							window.location = window.location.origin + '/{0}/{1}/'.format( self.pagename, self.permalinks[1] );
+						} );
+
+						self.isInit = true;
+
+					};
+
+					self.setPageState = function( currentPage ) {
+
+						self.currentPage = parseInt( currentPage );
+
+						var state = { gpmpnPage: self.currentPage };
+
+						self.history.push( state );
+						window.history.pushState( state, null, '/{0}/{1}/'.format( self.pagename, self.permalinks[ currentPage ] ) );
+
+					}
+
+					self.init();
+
+				}
+
+			} )( jQuery );
+
+		</script>
+
+		<?php
+	}
+
+	public function add_init_script( $form ) {
+
+		if ( ! $this->is_applicable_form( $form ) ) {
+			return;
+		}
+
+		$args = array(
+			'formId'      => $this->_args['form_id'],
+			'pagename'    => $this->_args['pagename'],
+			'permalinks'  => $this->_args['permalinks'],
+			'defaultPage' => get_query_var( 'gpmpn_page' ),
+		);
+
+		$script = 'if ( typeof window.GPMPNPagePermalinks !== \'undefined\' ) { new GPMPNPagePermalinks( ' . json_encode( $args ) . ' ); }';
+		$slug   = implode( '_', array( 'gpmpn_page_permalinks', $this->_args['form_id'] ) );
+
+		GFFormDisplay::add_init_script( $this->_args['form_id'], $slug, GFFormDisplay::ON_PAGE_RENDER, $script );
+
+	}
+
+	public function is_applicable_form( $form ) {
+
+		$form_id = isset( $form['id'] ) ? $form['id'] : $form;
+
+		return empty( $this->_args['form_id'] ) || (int) $form_id == (int) $this->_args['form_id'];
+	}
+
+}
+
+# Configuration
+
+new GPMPN_Page_Permalinks( array(
+	'form_id'    => 889,
+	'pagename'   => 'permalinks-for-form-pages',
+	'permalinks' => array(
+		1 => 'page-one',
+		2 => 'page-two',
+		3 => 'page-three',
+		0 => 'confirmation'
+	),
+) );