<?php
/**
 * The ALB Element Manager class handles information about usage of elements in posts and other additional info needed about the elements.
 *
 * In a first step it handles shortcodes in ALB and non ALB pages, but will also handle oncoming implementations of ALB elements.
 *
 * @author      Günter
 * @since       4.3
 */

if ( ! defined( 'ABSPATH' ) ) {  exit;  }    // Exit if accessed directly


if( ! class_exists( 'aviaElementManager' ) )
{

    class aviaElementManager
    {
        const VERSION           = '1.0.1';              //  Main version - needed to check for main global updates
        const USAGE_VERSION     = '1.0';                //  Stored data structure version - change for minor updates only
        const USAGE_PREFIX      = 'av_alb_usage_';
        const ELEMENT_UID       = 'av_uid';             //  unique ID attribute key used in shortcode (or jsoin datastructure later)

        /**
         * Accumulate added id's used as prefix
         *
         * @since 4.3
         * @var int
         */
        static private $added_uid = 1;


        /**
         *
         * @since 4.3
         * @var array
         */
        protected $registered_alb_elements;

        /**
         * Single page info - currently only containing count info
         *
         *      $shortcode =>  array (  'count'     =>  $count,
         *                              'version'   =>  $version
         *                         )
         * @since 4.3
         * @var array
         */
        protected $usage_info;


        /**
         * Is filled by default in get_header action with the ALB elements of the current post
         * false, if an error occured generating the elements, null if could not be filled (needs function get_the_ID()
         *
         *      [$shortcode_name] =>  array(
         *                              'element'   => $shortcode_name
         *                              'count      => $nr_of_occurrence
         *                      )
         * @since 4.3
         * @var array|false|null
         */
        protected $current_post_elements;


        /**
         *
         * @since 4.3
         * @var array|false                 $post_id    =>      array(  $element  =>  true|false  )
         */
        protected $post_elements_state;


        /**
         *
         * @since 4.3
         * @var array|false                 $element  =>  true|false
         */
        protected $blog_elements_state;


        /**
         *
         * @since 4.3
         * @var array                       $element    =>  'checked' | 'new' | 'initialising'
         */
        protected $checked_elements;


        /**
         *
         * @since 4.3
         */
        public function __construct()
        {
            $this->registered_alb_elements = null;
            $this->usage_info = array();
            $this->current_post_elements = null;
            $this->blog_elements_state = array();
            $this->post_elements_state = array();
            $this->checked_elements = null;

            add_action( 'get_header', array( $this, 'handler_wp_get_header' ), 10, 1 );

            if( is_admin() )
            {
                add_action( 'admin_init', array( $this, 'handler_check_for_version_updates' ), 10 );
                add_action( 'trashed_post', array( $this, 'handler_wp_trashed_post' ), 10, 1 );
                add_action( 'untrash_post', array( $this, 'handler_wp_untrash_post' ), 10, 1 );

                add_action( 'ava_after_import_demo_settings', array( $this, 'handler_after_import_demo' ), 10 );
            }

            return $this;
        }

        /**
         *
         * @since 4.3
         */
        public function __destruct()
        {
            unset( $this->registered_alb_elements );
            unset( $this->usage_info );
            unset( $this->current_post_elements );
            unset( $this->blog_elements_state );
            unset( $this->post_elements_state );
            unset( $this->checked_elements );
        }


        /**
         * Returns all registered ALB element names (currently this is a wrapper for the shortcode names)
         *
         * @since 4.3
         * @return array
         */
        public function registered_elements()
        {
            if( is_null( $this->registered_alb_elements ) )
            {
                $this->registered_alb_elements = apply_filters( 'avf_get_all_alb_element_names', array_merge( ShortcodeHelper::$allowed_shortcodes, ShortcodeHelper::$nested_shortcodes ) );
                $this->registered_alb_elements = array_merge( array_unique( $this->registered_alb_elements ) );
            }

            return $this->registered_alb_elements;
        }


        /**
         * Returns an array of elements and the check status
         *
         * @since 4.3
         * @return array
         */
        public function get_checked_elements()
        {
            if( is_null( $this->checked_elements ) )
            {
                $this->checked_elements = get_option( 'av_alb_element_check_stat', array() );
            }

            return $this->checked_elements;
        }


        /**
         * Update the checked elements array in DB
         *
         * @since 4.3
         * @param array $elements
         */
        public function update_checked_elements( array $elements )
        {
            if( serialize( $elements ) == serialize( $this->checked_elements ) )
            {
                return true;
            }

            $this->checked_elements = $elements;

            return update_option( 'av_alb_element_check_stat', $elements );
        }

        /**
         * Compares the registered elements with the already existing checked element list.
         * Adds new elements to the list (marked 'new').
         * Checks, if all elements have been marked 'checked'
         *
         * We assume new elements as checked, if we find one post that uses that element. Under normal working conditions we catch the first
         * use on the post update and add it to the element usage info.
         * As long as user does not manipulate post content outside normal WP workflow or uses the shortcode before registering the element
         * this assumption will work.
         *
         * If we only have new elements (= pageload
         *
         * @since 4.3
         * @param string $initialise            '' | 'initialise'
         * @return array                        'new' | 'initialising' | 'only_new' | empty array
         */
        public function all_elements_checked( $initialise = '' )
        {
            static $checked = null;

            if( ! is_null( $checked ) && ( 'initialise' != $initialise ) )
            {
                return $checked;
            }

            $chk = $this->get_checked_elements();

            /**
             * Only check for new elements in backend
             */
            if( is_admin() || ( 'initialise' == $initialise ) )
            {
                $update = false;
                $els = $this->registered_elements();

                foreach ( $els as $el )
                {
                    if( ! array_key_exists( $el, $chk ) )
                    {
                        $chk[ $el ] = 'new';
                        $update = true;
                    }
                }

                foreach( $chk as $elem => $value )
                {
                    if( 'new' == $value )
                    {
                        $key = aviaElementManager::USAGE_PREFIX . $elem;
                        $entry = get_option( $key, array() );
                        /**
                         * set to checked if used at least once and assume checked
                         */
                        if( ! empty( $entry ) )
                        {
                            $chk[ $elem ] = 'checked';
                            $update = true;
                        }
                    }
                }

                if( $update )
                {
                    $this->update_checked_elements( $chk );
                }
            }

            $checked = array_values( array_unique( $chk ) );

            if( ( 1 == count( $checked ) ) && ( 'new' == $checked[0] ) )
            {
                $checked = array( 'only_new' );
            }
            else
            {
                $checked = array_diff( $checked, array( 'checked' ) );
            }

            return $checked;
        }

        /**
         * Returns the array with infos about elements used for the current post
         * Needs the function get_the_ID() to fill the array
         *
         * @since 4.3
         * @return array|false|null
         */
        public function get_current_post_elements()
        {
            if( is_null( $this->current_post_elements ) && ( false !== get_the_ID() ) )
            {
                $this->current_post_elements = $this->get_posts_detail_element_info( get_the_ID() );
            }

            return $this->current_post_elements;
        }


        /**
         * Returns an array with all registered ALB elements as key and info true|false
         * To speed up frontend we save infos in options/postmeta once we have the info.
         * From backend on update post we force a writing to DB.
         *
         * @since 4.3
         * @param string $source            'post' | 'blog'
         * @param int $post_id              defaults to the value of get_the_ID();
         * @param string $initialise        '' | 'initialise'
         * @return array|false
         */
        public function get_elements_state( $source = 'post', $post_id = 0, $initialise = '' )
        {
            if( ( 'post' == $source ) && ( 0 == $post_id ) )
            {
                $post_id = get_the_ID();
                if( false === $post_id )
                {
                    return false;
                }
            }

            $intersect = array_intersect( array( 'initialising', 'only_new' ), $this->all_elements_checked( $initialise ) );

            if( ! empty( $intersect ) )
            {
                if( 'initialise' != $initialise )
                {
                    return false;
                }
            }

            $elements = $this->registered_elements();

            /**
             * In frontend try to get cached values
             */
            if( ! is_admin() )
            {
                if( 'post' == $source )
                {
                    if( isset( $this->post_elements_state[ $post_id ] ) )
                    {
                        return $this->post_elements_state[ $post_id ];
                    }

                    /**
                     * To save memory we only saved used elements - we need to fill up the whole array
                     */
                    $stored = get_post_meta( $post_id, '_av_alb_posts_elements_state', true );

                    if( ! empty( $stored ) && is_array( $stored ) )
                    {
                        $all_elements = array_flip( $elements );
                        foreach( $all_elements as $e => $value )
                        {
                            $all_elements[ $e ] = ( isset( $stored[ $e ] ) && ( true === $stored[ $e ] ) ) ? true : false;
                        }

                        $this->post_elements_state[ $post_id ] = $all_elements;
                        return $all_elements;
                    }
                }

                else
                {
                    if( ! empty( $this->blog_elements_state ) )
                    {
                        return $this->blog_elements_state;
                    }

                    $stored = get_option( 'av_alb_blog_elements_state', array() );
                    if( ! empty( $stored ) )
                    {
                        $this->blog_elements_state = $stored;
                        return $this->blog_elements_state;
                    }
                }
            }

            $states = array();

            foreach ( $elements as $element )
            {
                $key = aviaElementManager::USAGE_PREFIX . $element;
                $entry = get_option( $key, array() );

                if( 'post' == $source )
                {
                    if( ! isset( $entry[ $post_id ] ) )
                    {
                        $states[ $element ] = false;
                    }
                    else
                    {
                        $states[ $element ] = ( $entry[ $post_id ]['count'] > 0 );
                    }
                    continue;
                }

                $states[ $element ] = false;

                if( ! empty( $entry ) )
                {
                    foreach ( $entry as $key => $value )
                    {
                        if( $value['count'] > 0 )
                        {
                            $states[ $element ] = true;
                            break;
                        }
                    }
                }
            }

            if( 'post' == $source )
            {
                /**
                 * To save storage we remove elements that are not used in the post
                 */
                $save_states = array();
                foreach( $states as $e => $used )
                {
                    if( true === $used )
                    {
                        $save_states[ $e ] = true;
                    }
                }

                update_post_meta( $post_id, '_av_alb_posts_elements_state', $save_states );
                $this->post_elements_state[ $post_id ] = $states;
            }
            else
            {
                update_option( 'av_alb_blog_elements_state', $states );
                $this->blog_elements_state = $states;
            }

            return $states;
        }

        /**
         *
         * @since 4.3
         * @param string $template
         */
        public function handler_wp_get_header( $template = null )
        {
            if( is_null( $this->current_post_elements ) )
            {
                $this->current_post_elements = $this->get_posts_detail_element_info( get_the_ID() );
            }

            do_action( 'ava_current_post_element_info_available', $this );
        }


        /**
         * After import of demos we need to force an update of elements settings
         *
         * @since 4.3
         */
        public function handler_after_import_demo()
        {
            update_option( 'av_alb_element_mgr', '' );
            update_option( 'av_alb_element_mgr_update', '' );

            $this->exec_version_update();
        }

        /**
         * Check if we need to update our class internal data
         *
         * @since 4.3
         */
        public function handler_check_for_version_updates()
        {
            $version = get_option( 'av_alb_element_mgr', '' );
            $update_state = get_option( 'av_alb_element_mgr_update', '' );

            if( ( aviaElementManager::VERSION == $version ) && ( '' == $update_state ) )
            {
                return;
            }

            if ( defined( 'DOING_AJAX' ) && DOING_AJAX )
            {
                return;
            }

                //  allow user to login/logout
            if( is_admin() && ( ! is_user_logged_in() ) )
            {
                return;
            }

            /**
             * Allow to filter function for a custom login page.
             * Return true or false (boolean value) if you used a custom page, else any numeric value for standard WP login page.
             *
             * @used_by:        currently unused
             *
             * @since 4.3
             */
            $result = apply_filters( 'avf_is_custom_admin_login_page', -1 );

            if( is_bool( $result ) )
            {
                return;
            }

            if( false !== stripos( $_SERVER["SCRIPT_NAME"], strrchr( wp_login_url(), '/') ) )
            {
                return;
            }

            $this->exec_version_update();
        }


        /**
         * Simple update function.
         *
         * As most user applications only have a few hundred pages/posts we do the update on the fly.
         * For larger databases we add state flags that recognise unfinished post updates and skip already
         * finished.
         *
         * Might be extended to a background process in future releases.
         *
         * IMPORTANT:
         * ==========
         *
         * It is possible to filter the predefined post types and status.
         * If this is done you have to change the version number (by adding .a ) to force a rebuild of the internal index.
         * We will always increment the version number using x.x only, so setting it to x.x.a is a save method to be
         * able to follow future updates without any further intervention.
         *
         * @since 4.3
         */
        protected function exec_version_update()
        {

            $update_state = get_option( 'av_alb_element_mgr_update', '' );

            $query_args = array(
                        'post_type'     => apply_filters( 'avf_alb_supported_post_types_elmgr', Avia_Builder()->get_supported_post_types() ),
                        'post_status'   => apply_filters( 'avf_alb_supported_post_status_elmgr', Avia_Builder()->get_supported_post_status() ),
                        'nopaging'      => true,
                        'fields'        => 'ids'
                    );

            if( '' != $update_state )
            {
                /**
                 * Filter not updated posts
                 */
                $query_args['meta_query'] = array(
                        array(
                                'key'     => '_av_alb_element_mgr_version',
                                'value'   => aviaElementManager::VERSION,
                                'compare' => '!=',
                            ),
                    );
            }

            $query = new WP_Query( $query_args );

            if( '' == $update_state )
            {
                /**
                 * Reset all internal data
                 */
                $chk = $this->get_checked_elements();

                foreach( $chk as $el => $value )
                {
                    $chk[ $el ] = 'initialising';
                }

                $this->update_checked_elements( $chk );

                $this->usage_info = array();
                $this->update_option_usage_info();

                $this->blog_elements_state = array();
                update_option( 'av_alb_blog_elements_state', $this->blog_elements_state );

                $this->post_elements_state = array();
            }

            update_option( 'av_alb_element_mgr_update', 'in_update' );


            foreach ( $query->posts as $post_id )
            {
                set_time_limit( 0 );

                /**
                 * Check if an update had been interrupted - skip already updated posts
                 */
                $updated = get_post_meta( $post_id, '_av_alb_element_mgr_version', true );
                if( ( $updated == aviaElementManager::VERSION ) && ( '' != $update_state ) )
                {
                    continue;
                }

                update_post_meta( $post_id, '_av_alb_posts_elements_state', array() );

                $content = Avia_Builder()->get_post_content( $post_id );

                $content_new = $this->set_element_ids_in_content( $content, $post_id, 'no_escape' );
                aviaElementManager::$added_uid = 1;

                if( $content != $content_new )
                {
                    Avia_Builder()->update_post_content( $post_id, $content_new );
                }

                $this->update_usage_from_post_content( $content_new, $post_id, 'initialise' );

                update_post_meta( $post_id, '_av_alb_element_mgr_version', aviaElementManager::VERSION );

                /**
                 * Reset no longer needed elements - free memory
                 */
                $this->post_elements_state = array();
            }

            unset( $query );

            $chk = $this->get_checked_elements();

            foreach ( $chk as $el => $value )
            {
                $chk[ $el ] = 'checked';
            }

            $this->update_checked_elements( $chk );

            $this->blog_elements_state = array();
            $this->get_elements_state( 'blog', 0, 'initialise' );

            update_option( 'av_alb_element_mgr', aviaElementManager::VERSION );
            update_option( 'av_alb_element_mgr_update', '' );
        }


        /**
         * Remove all element info for this post from options
         *
         * @since 4.3
         * @param int $post_id
         */
        public function handler_wp_trashed_post( $post_id )
        {
            global $post;

            if( $post->ID != $post_id )
            {
                return;
            }

            /**
             * Remove all index entries by rendering an empty content
             */
            $this->updated_post_content( '', $post_id, 'trash' );
        }


        /**
         * Restore all element info for this post from options
         *
         * @since 4.4.1
         * @param int $post_id
         */
        public function handler_wp_untrash_post( $post_id )
        {
            global $post;

            if( $post->ID != $post_id )
            {
                return;
            }

            /**
             * Restore all index entries by rendering content
             */
            $this->updated_post_content( $post->post_content, $post_id, 'untrash' );
        }


        /**
         * Returns an array of all used ALB shortcodes in given post:
         *
         *      [$shortcode_name] =>  array(
         *                              'element'   => $shortcode_name
         *                              'count      => $nr_of_occurrence
         *                      )
         *
         * @since 4.3
         * @param int $post_id
         * @return array|false          false, if we could not get a valid result for the post( = updateing the options is DB failed / not a valid post object )
         */
        public function get_posts_detail_element_info( $post_id )
        {
            $state = get_post_meta( $post_id, '_av_el_mgr_version', true );

            /**
             * We access a non checked post or last check failed
             * ( this is a fallback only under normal workflow )
             */
            if( $state != aviaElementManager::USAGE_VERSION )
            {
                $content = Avia_Builder()->get_post_content( $post_id );

                if( false === $content )
                {
                    return false;
                }

                if( false === $this->update_usage_from_post_content( $content, $post_id ) )
                {
                    return false;
                }
            }

            $elements = $this->registered_elements();

            $used = array();

            foreach ( $elements as $element )
            {
                $key = aviaElementManager::USAGE_PREFIX . $element;
                $entry = get_option( $key, array() );

                if( ! isset( $entry[ $post_id ] ) )
                {
                    continue;
                }

                $used[ $element ] = array(
                                        'element'   => $element,
                                        'count'     => $entry[ $post_id ]['count']
                                    );
            }

            return $used;
        }


        /**
         * Called when a new post is added or content is updated. Checks if we have a post we need to deal with.
         *
         * @since 4.4.1
         * @param string $content
         * @param int $post_id
         * @param string $action                'update' | 'trash' | 'untrash'
         * @return boolean
         */
        public function updated_post_content( $content, $post_id, $action = 'update' )
        {
            global $post;

            /**
             * See comment for function exec_version_update
             */
            $post_types = apply_filters( 'avf_alb_supported_post_types_elmgr', Avia_Builder()->get_supported_post_types() );
            $post_status = apply_filters( 'avf_alb_supported_post_status_elmgr', Avia_Builder()->get_supported_post_status() );

            if( ! in_array( $post->post_type, $post_types ) )
            {
                return;
            }

            $check_status = $post->post_status;

            switch( $action )
            {
                case 'trash':
                    /**
                     * Post status is still original statut - WP does not update $post
                     */
                    $content = '';
                    break;
                case 'untrash':
                    /**
                     * Post status is trash - WP does not update $post (not even on a later hook)
                     */
                    $check_status = get_post_meta( $post_id, '_wp_trash_meta_status', true );
                    break;
                case 'update':
                default:
                    break;
            }

            if( ! in_array( $check_status, $post_status ) )
            {
                return;
            }

            return $this->update_usage_from_post_content( $content, $post_id );
        }

        /**
         * Updates the usage info for ALB elements from the post content.
         * Also sets a postmeta that we know we updated the usage info and with wich version it was updated
         *
         * @since 4.3
         * @param string $content
         * @param int $post_id
         * @param string $initialise            '' | 'initialise'
         * @return boolean
         */
        public function update_usage_from_post_content( $content, $post_id, $initialise = '' )
        {

            $this->usage_info = array();

            $matches = array();

            preg_match_all( "/" . ShortcodeHelper::get_fake_pattern( true, $this->registered_elements(), 'fake' ) . "/s", $content, $matches );
            if( is_array( $matches ) && is_array( $matches[0] ) && ( ! empty( $matches[0] ) ) )
            {
                $elements = explode( ',', str_replace( array( '[', ']' ), '', implode( ',', $matches[0] ) ) );
            }
            else
            {
                $elements = array();
            }

            $this->add_usage_info( $elements, $post_id );

            $success = $this->update_option_usage_info( $post_id );

            $pm = $success ? aviaElementManager::USAGE_VERSION : 'failed';
            update_post_meta( $post_id, '_av_el_mgr_version', $pm );

            /**
             * Force update of cache data
             */
            unset( $this->post_elements_state[ $post_id ] );
            $this->get_elements_state( 'post', $post_id, $initialise );

            if( 'initialise' != $initialise )
            {
                $this->blog_elements_state = array();
                $this->get_elements_state( 'blog' );
            }

            return $success;
        }


        /**
         * Updates the array $this->usage_info
         *
         * @since 4.3
         * @param array $elements
         */
        protected function add_usage_info( array $elements )
        {
            if( empty( $elements ) )
            {
                return;
            }

            /**
             * If an element is marked as new and we find it in the post we assume that this is the first and only occurence and we can
             * mark this element as checked
             */
            $new = array();
            $found = array();
            $check = $this->all_elements_checked();

            if( ! empty( $check ) )
            {
                $new = array_intersect( $this->get_checked_elements(), array( 'new' ) );
            }

            foreach ( $elements as $element )
            {
                $element = trim( $element );

                /**
                 * Don't count closing tags
                 */
                if( strpos( $element, '/' ) !== false )
                {
                    continue;
                }

                if( array_key_exists( $element, $new ) )
                {
                    $found[] = $element;
                    unset( $new[ $element ] );
                }

                if( array_key_exists( $element, $this->usage_info ) )
                {
                    $this->usage_info[ $element ]['count']++;
                }
                else
                {
                    $this->usage_info[ $element ] = array(
                                                'version'   => aviaElementManager::USAGE_VERSION,
                                                'count'     => 1
                                            );
                }
            }

            if( empty( $found ) )
            {
                return;
            }

            $chk = $this->get_checked_elements();

            foreach( $found as $el )
            {
                $chk[ $el ] = 'checked';
            }

            $this->update_checked_elements( $chk );
        }


        /**
         * Update the element usage entries in options.
         * Tries to update all options (also if an error occurs)
         *
         * @since 4.3
         * @param int $post_id          0 to clear all entries
         * @return boolean              false, if the update failed and we have an inconsistent info
         */
        protected function update_option_usage_info( $post_id = 0 )
        {
            $all_elements = array_flip( $this->registered_elements() );

            $success = true;

            foreach( $this->usage_info as $element => $info )
            {
                $key = aviaElementManager::USAGE_PREFIX . $element;
                $entry = get_option( $key, array() );

                /**
                 * As we also get false when values are not changed we have to check manually before update
                 */
                $need_update = true;
                if( isset( $entry[ $post_id ] ) )
                {
                    $diff1 = array_diff_assoc( $entry[ $post_id ], $info );
                    $diff2 = array_diff_assoc( $info, $entry[ $post_id ] );

                    $need_update = ! ( empty( $diff1 ) && empty( $diff2 ) );
                }

                if( $need_update )
                {
                    $entry[ $post_id ] = $info;
                    if( ! update_option( $key, $entry ) )
                    {
                        $success = false;
                    }
                }

                unset( $all_elements[ $element ] );
            }

            /**
             * Remove entries that were removed
             */
            foreach( $all_elements as $element => $dummy )
            {
                $key = aviaElementManager::USAGE_PREFIX . $element;
                $entry = get_option( $key, array() );

                if( array_key_exists( $post_id, $entry ) || ( 0 == $post_id ) )
                {
                    if( 0 == $post_id )
                    {
                        $entry = array();
                    }
                    else
                    {
                        unset( $entry[ $post_id ] );
                    }

                    if( ! update_option( $key, $entry ) )
                    {
                        $success = false;
                    }
                }
            }

            return $success;
        }

        /**
         * Scans all ALB shortcodes and checks, if they have a unique id.
         *
         * @since 4.3
         * @param string $content
         * @param int $post_id
         * @param string $escspe            'escape' | 'no_escape'
         * @return string
         */
        public function set_element_ids_in_content( $content, $post_id, $escspe = 'escape' )
        {
            $all_elements = $this->registered_elements();

            $elements = array();
            preg_match_all( "/" . get_shortcode_regex( $all_elements ) . "/s", $content, $elements, PREG_OFFSET_CAPTURE );
            if( empty( $elements ) || ! is_array( $elements ) || empty( $elements[0] ) )
            {
                return $content;
            }

            $count = count( $elements[0] );

            for( $i = $count - 1; $i >= 0; $i-- )
            {
                /**
                 * Check for nested shortcodes
                 */
                if( ! empty( $elements[5][ $i ][0] ) )
                {
                    $new_content = $this->set_element_ids_in_content( $elements[5][ $i ][0], $post_id, $escspe );
                    if( $elements[5][ $i ][0] != $new_content )
                    {
                        $content = substr_replace( $content, $new_content, $elements[5][ $i ][1], strlen( $elements[5][ $i ][0] ) );
                    }
                }

                $atts = shortcode_parse_atts( stripslashes( $elements[3][ $i ][0] ) );
                if( ! is_array( $atts ) )
                {
                    $atts = array();
                }

                if( array_key_exists( aviaElementManager::ELEMENT_UID, $atts ) && ( '' != trim( $atts[ aviaElementManager::ELEMENT_UID ] ) ) )
                {
                    continue;
                }

                $atts[ aviaElementManager::ELEMENT_UID ] = 'av-' . base_convert( aviaElementManager::$added_uid . mt_rand( 10, 9999 ) . $post_id , 10, 36 );
                aviaElementManager::$added_uid ++;

                $new_atts = '';
                foreach( $atts as $att => $value)
                {
                    $new_atts .= ( is_numeric( $att ) ) ?  " {$value}" : " {$att}='{$value}'";
                }

                if( 'escape' == $escspe )
                {
                    $new_atts = addslashes( $new_atts );
                }

                $content = substr_replace( $content, $new_atts, $elements[3][ $i ][1], strlen( $elements[3][ $i ][0]) );
            }

            return $content;
        }

        /**
         * Add debug info to shortcode parser debug page
         *
         * @since 4.3
         * @return string
         */
        public function debug_element_usage_info()
        {

            $blog = $this->get_elements_state( 'blog' );
            if( ! is_array( $blog )  )
            {
                $blog = __( 'Blog status of elements is currently not available', 'avia_framework' );
            }
            else
            {
                ksort( $blog );
                $blog = $this->esc_boolean( $blog );
            }

            $post = $this->get_elements_state( 'post' );
            if( ! is_array( $post )  )
            {
                $post = __( 'Post status of elements is currently not available', 'avia_framework' );
            }
            else
            {
                ksort( $post );

                foreach( $post as $element => $value )
                {
                    if( false === $value )
                    {
                        unset( $post[ $element ] );
                    }
                }

                $post = $this->esc_boolean( $post );
            }

            $chk = $this->get_checked_elements();

            $detail = array();

            $reg_elements = $this->registered_elements();
            sort( $reg_elements );

            foreach( $reg_elements as $element )
            {
                $key = aviaElementManager::USAGE_PREFIX . $element;

                $value = get_option( $key, array() );
                ksort( $value );
                $detail[ $element ] = $value;
            }

            $update_state = get_option( 'av_alb_element_mgr_update', '' );
            $update_state = ( '' != $update_state ) ? __( 'currently updating database', 'avia_framework' ) : __( 'is up to date', 'avia_framework' );

            $out = '';

            $out .=     "[av_tab title='" . __( 'Shortcode Usage Overview', 'avia_framework' ) . "' icon_select='yes' icon='ue823' font='entypo-fontello']";

            $out .=         "[av_toggle_container initial='0' mode='toggle' sort='true' styling='' colors='' font_color='' background_color='' border_color='' custom_class='']";

            $out .=             "[av_toggle title='" . __( 'General Element Manager Info', 'avia_framework' ) . "' tags='blog']";

            $out .=                 '<p class="av-el-mgr-info av-version">' . __( 'Element Manager Version: ', 'avia_framework' ) . aviaElementManager::VERSION . '</p>';
            $out .=                 '<p class="av-el-mgr-info av-update">' . __( 'Element Manager Update State: ', 'avia_framework' ) . $update_state . '</p>';

            $out .=             "[/av_toggle]";

            $out .=             "[av_toggle title='" . __( 'Blog Usage - which elements are used in the blog', 'avia_framework' ) . "' tags='blog']";

            $out .=                 '<pre><code>';
            $out .=                     $this->esc_shortcode( print_r( $blog, true ) );
            $out .=                 '</code></pre>';

            $out .=             "[/av_toggle]";

            $out .=             "[av_toggle title='" . __( 'Post Usage - which elements are used in this post', 'avia_framework' ) . "' tags='post']";

            $out .=                 '<pre><code>';
            $out .=                     $this->esc_shortcode( print_r( $post, true ) );
            $out .=                 '</code></pre>';

            $out .=             "[/av_toggle]";

            $out .=             "[av_toggle title='" . __( 'Check State - shows, which elements are recognised or new or in update', 'avia_framework' ) . "' tags='check']";

            $out .=                 '<pre><code>';
            $out .=                     $this->esc_shortcode( print_r( $chk, true ) );
            $out .=                 '</code></pre>';

            $out .=             "[/av_toggle]";

            $out .=         "[/av_toggle_container]";

            $out .=     "[/av_tab]";


            $out .=     "[av_tab title='" . __( 'Detailed Shortcode Usage', 'avia_framework' ) . "' icon_select='yes' icon='ue826' font='entypo-fontello']";

            $out .=         "[av_toggle_container initial='0' mode='toggle' sort='true' styling='' colors='' font_color='' background_color='' border_color='' custom_class='']";

            foreach( $detail as $element => $usage )
            {
                $element_desc = $element . ' ( ' . count( $usage ) . ' )';
                $out .=             "[av_toggle title='{$element_desc}' tags='{$element_desc}']";

                $out .=                 '<pre><code>';
                $out .=                     $this->esc_shortcode( print_r( $usage, true ) );
                $out .=                 '</code></pre>';

                $out .=             "[/av_toggle]";
            }

            $out .=         "[/av_toggle_container]";

            $out .=     "[/av_tab]";

            return $out;
        }

        /**
         * Remove  [ and ]
         *
         * @since 4.3
         * @param string $text
         * @return string
         */
        private function esc_shortcode( $text )
        {
            return str_replace( array( '[', ']' ), '"', $text );
        }


        /**
         * Replace a boolean value by string
         *
         * @since 4.3
         * @param array $values
         * @return array
         */
        private function esc_boolean( array $values )
        {
            foreach( $values as $key => $value )
            {
                if( is_bool( $value ) )
                {
                    $values[ $key ] = $value ? 'true' : 'false';
                }
            }

            return $values;
        }

    }

}