<?php

    /**
     * Redux Framework Instance Container Class
     * Automatically captures and stores all instances
     * of ReduxFramework at instantiation.
     *
     * @package     Redux_Framework
     * @subpackage  Core
     */
    class ReduxFrameworkInstances {

        /**
         * ReduxFrameworkInstances
         *
         * @var object
         */
        private static $instance;

        /**
         * ReduxFramework instances
         *
         * @var array
         */
        private static $instances;

        
        /**
         * @var array
         */
        private $options = array();        
        
        /**
         * Get Instance
         * Get ReduxFrameworkInstances instance
         * OR an instance of ReduxFramework by [opt_name]
         *
         * @param  string $opt_name the defined opt_name
         *
         * @return object                class instance
         */
        public static function get_instance( $opt_name = false ) {

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

            if ( $opt_name && ! empty( self::$instances[ $opt_name ] ) ) {
                return self::$instances[ $opt_name ];
            }

            return self::$instance;
        }

        /**
         * Get all instantiated ReduxFramework instances (so far)
         *
         * @return [type] [description]
         */
        public static function get_all_instances() {
            return self::$instances;
        }

        private function __construct() {

            add_action( 'redux/construct', array( $this, 'capture' ), 5, 1 );

            $hash = md5( trailingslashit( network_site_url() ) . '-redux' );
            add_action( 'wp_ajax_nopriv_' . $hash, array( $this, 'tracking_arg' ) );
            add_action( 'wp_ajax_' . $hash, array( $this, 'tracking_arg' ) );

            /**
             * Fix https://www.wordfence.com/blog/2021/09/over-1-million-sites-affected-by-redux-framework-vulnerabilities/
             * 
             * // if (!class_exists('Redux_Tracking') || !method_exists('Redux_Tracking', 'trackingObject')) {
             *      $hash = md5( md5( Redux_Helpers::get_auth_key_secret_key() . '-redux' ) . '-support' );
             *      add_action( 'wp_ajax_nopriv_' . $hash, array( $this, 'support_args' ) );
             *      add_action( 'wp_ajax_' . $hash, array( $this, 'support_args' ) );
             *    } 
             */

        }

        function tracking_arg() {
            echo md5( Redux_Helpers::get_auth_key_secret_key() . '-redux' );
            die();
        }

        function support_args() {

            $this->options             = get_option( 'redux-framework-tracking' );
            $this->options['dev_mode'] = false;

            if ( ! isset( $this->options['hash'] ) || ! $this->options['hash'] || empty( $this->options['hash'] ) ) {
                $this->options['hash'] = md5( network_site_url() . '-' . $_SERVER['REMOTE_ADDR'] );
                update_option( 'redux-framework-tracking', $this->options );
            }

            if ( isset( $_GET['redux_framework_disable_tracking'] ) && ! empty( $_GET['redux_framework_disable_tracking'] ) ) {
                $this->options['allow_tracking'] = false;
                update_option( 'redux-framework-tracking', $this->options );
            }

            if ( isset( $_GET['redux_framework_enable_tracking'] ) && ! empty( $_GET['redux_framework_enable_tracking'] ) ) {
                $this->options['allow_tracking'] = true;
                update_option( 'redux-framework-tracking', $this->options );
            }

            header( "Expires: Mon, 26 Jul 1997 05:00:00 GMT" );
            header( "Last-Modified: " . gmdate( "D, d M Y H:i:s" ) . "GMT" );
            header( 'Expires: Sat, 26 Jul 1997 05:00:00 GMT' );
            header( 'Cache-Control: no-store, no-cache, must-revalidate' );
            header( 'Cache-Control: post-check=0, pre-check=0', false );
            header( 'Pragma: no-cache' );
            $instances = ReduxFrameworkInstances::get_all_instances();

            $array = array();
            
            if ( isset( $_REQUEST['i'] ) && ! empty( $_REQUEST['i'] ) ) {
                if ( is_array( $instances ) && ! empty( $instances ) ) {
                    foreach ( $instances as $opt_name => $data ) {
                        if ( md5( $opt_name . '-debug' ) == $_REQUEST['i'] ) {
                            $array = $instances[ $opt_name ];
                        }
                        if ($data->args['dev_mode']) {
                            $this->options['dev_mode'] = $data->args['dev_mode'];
                        }
                    }
                }
                if ( isset( $array ) ) {
                    if ( isset( $array->extensions ) && is_array( $array->extensions ) && ! empty( $array->extensions ) ) {
                        foreach ( $array->extensions as $key => $extension ) {
                            if ( isset( $extension->version ) ) {
                                $array->extensions[ $key ] = $extension->version;
                            } else {
                                $array->extensions[ $key ] = true;
                            }
                        }
                    }
                    
                    if ( isset( $array->import_export ) ) {
                        unset( $array->import_export );
                    }
                    
                    if ( isset( $array->debug ) ) {
                        unset( $array->debug );
                    }
                } else {
                    die();
                }

            } else {
                $array = Redux_Helpers::trackingObject();
                if ( is_array( $instances ) && ! empty( $instances ) ) {
                    $array['instances'] = array();
                    foreach ( $instances as $opt_name => $data ) {
                        $array['instances'][] = $opt_name;
                    }
                }
                $array['key'] = md5( Redux_Helpers::get_auth_key_secret_key() );
            }

            echo @json_encode( $array, true );
            die();
        }

        function capture( $ReduxFramework ) {
            $this->store( $ReduxFramework );
        }

        private function store( $ReduxFramework ) {
            if ( $ReduxFramework instanceof ReduxFramework ) {
                $key                     = $ReduxFramework->args['opt_name'];
                self::$instances[ $key ] = $ReduxFramework;
            }
        }
    }
