<?php
if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

require_once QTRANSLATE_DIR . '/src/admin/admin_utils.php';
require_once QTRANSLATE_DIR . '/src/admin/admin_options.php';
require_once QTRANSLATE_DIR . '/src/admin/languages.php';
require_once QTRANSLATE_DIR . '/src/admin/user_options.php';
require_once QTRANSLATE_DIR . '/src/admin/admin_taxonomy.php';

/**
 * @see qtranxf_collect_translations
 */
function qtranxf_collect_translations_deep( $qfields, $sep ) {
    $content = reset( $qfields );
    if ( is_string( $content ) ) {
        return qtranxf_join_texts( $qfields, $sep );
    }
    $result = array();
    // collect recursively
    foreach ( $content as $f => $r ) {
        $texts = array();
        foreach ( $qfields as $lang => $vals ) {
            $texts[ $lang ] = $vals[ $f ];
        }
        $result[ $f ] = qtranxf_collect_translations_deep( $texts, $sep );
    }

    return $result;
}

/**
 * Collect translations of all ML fields posted in $_REQUEST into Raw ML values, recursively.
 * Called in response to action 'plugins_loaded'.
 * All data is yet unslashed when action 'plugins_loaded' is executed.
 *
 * @param array $qfields a sub-tree of $_REQUEST['qtranslate-fields'], which contains translations for field $request.
 * @param array|string $request an ML field of $_REQUEST.
 * @param string $edit_lang language of the active LSB at the time of sending the request.
 */
function qtranxf_collect_translations( &$qfields, &$request, $edit_lang ): void {
    if ( isset( $qfields['qtranslate-separator'] ) ) {
        $sep = $qfields['qtranslate-separator'];
        unset( $qfields['qtranslate-separator'] );
        if ( ! qtranxf_isMultilingual( $request ) ) {
            // convert to ML value
            $qfields[ $edit_lang ] = $request;
            $request               = qtranxf_collect_translations_deep( $qfields, $sep );
        }
        // Otherwise: raw mode, or user mistakenly put ML value into an LSB-controlled field.
        // Leave request as user entered it.
    } else {
        foreach ( $qfields as $name => &$values ) {
            if ( ! isset( $request[ $name ] ) ) {
                unset( $qfields[ $name ] );
                continue;
            }
            qtranxf_collect_translations( $values, $request[ $name ], $edit_lang );
        }
    }
}

/**
 * @since 3.4.6.5
 */
function qtranxf_decode_json_name_value( $value ): ?array {
    if ( strpos( $value, 'qtranslate-fields' ) === false ) {
        return null;
    }

    $name_value = json_decode( stripslashes( $value ) );
    if ( is_null( $name_value ) ) {
        return null;
    }

    // TODO this looks unnecessary, it might be possible to use json_decode directly with right options
    return qtranxf_decode_name_value( $name_value );
}

/**
 * @see qtranxf_collect_translations
 */
function qtranxf_collect_translations_posted() {
    if ( isset( $_REQUEST['qtranslate-fields'] ) ) {
        $edit_lang = qtranxf_get_edit_language();
        foreach ( $_REQUEST['qtranslate-fields'] as $name => &$qfields ) {
            if ( ! isset( $_REQUEST[ $name ] ) ) {
                unset( $_REQUEST['qtranslate-fields'][ $name ] );
                continue;
            }
            qtranxf_collect_translations( $qfields, $_REQUEST[ $name ], $edit_lang );
            if ( isset( $_POST[ $name ] ) ) {
                $_POST[ $name ] = $_REQUEST[ $name ];
            }
            if ( isset( $_GET[ $name ] ) ) {
                $_GET[ $name ] = $_REQUEST[ $name ];
            }
        }
        qtranxf_clean_request( 'qtranslate-fields' );
    }
}

function qtranxf_decode_translations_posted() {
    // quick fix, there must be a better way
    if ( isset( $_POST['nav-menu-data'] ) ) {
        $request = qtranxf_decode_json_name_value( $_POST['nav-menu-data'] );
        if ( ! empty( $request['qtranslate-fields'] ) ) {
            $edit_lang = qtranxf_get_edit_language();
            qtranxf_collect_translations( $request['qtranslate-fields'], $request, $edit_lang );
            unset( $request['qtranslate-fields'] );
            foreach ( $request as $key => $value ) {
                $_POST[ $key ] = $value;
            }
            unset( $_POST['nav-menu-data'] );
        }
    }
}

function qtranxf_load_admin_page_config() {
    $page_configs = qtranxf_get_admin_page_config();
    if ( ! empty( $page_configs['']['filters'] ) ) {
        qtranxf_add_filters( $page_configs['']['filters'] );
    }
}

/**
 * @return bool true when the current page is the configuration page of QT-XT.
 * @since 3.4.7
 */
function qtranxf_admin_is_config_page(): bool {
    global $q_config, $pagenow;

    return ( $pagenow == 'options-general.php' )
           && isset( $q_config['url_info']['query'] )
           && ( strpos( $q_config['url_info']['query'], 'page=qtranslate-xt' ) !== false );
}

function qtranxf_admin_init() {
    global $q_config;

    if ( current_user_can( 'manage_options' ) ) {
        add_action( 'admin_notices', 'qtranxf_admin_notices_config' );

        if ( qtranxf_admin_is_config_page() ) {
            // TODO run this only if one of the forms or actions submitted --> && !empty($_POST)
            require_once QTRANSLATE_DIR . '/src/admin/admin_options_update.php';
            qtranxf_edit_config();
        }

        // Check for deprecated and invalid options.
        if ( isset( $q_config['use_strftime'] ) ) {
            if ( $q_config['use_strftime'] == QTX_STRFTIME_OVERRIDE || $q_config['use_strftime'] == QTX_DATE_OVERRIDE ) {
                $warning = sprintf( __( 'The value set for option "%s" is deprecated, it will not be supported in the future. Go to the <a href="%s">%s</a> to update it.', 'qtranslate' ),
                    __( 'Date / Time Conversion', 'qtranslate' ), admin_url( 'options-general.php?page=qtranslate-xt#advanced' ), __( 'advanced settings', 'qtranslate' ) );
                qtranxf_add_warning( $warning );
            }
            if ( $q_config['use_strftime'] != QTX_DATE_WP && ! class_exists( 'IntlDateFormatter' ) ) {
                $warning = sprintf( __( 'The value set for option "%s" cannot be used.', 'qtranslate' ), __( 'Date / Time Conversion', 'qtranslate' ) ) . ' ';
                $warning .= sprintf( __( 'Class not found: <a href="%s">%s</a> likely due to missing PHP extension: <a href="%s">%s</a>.', 'qtranslate' ),
                    'https://www.php.net/manual/en/class.intldateformatter.php', '`IntlDateFormatter`',
                    'https://www.php.net/manual/en/intl.setup.php', '`Intl`' );
                qtranxf_add_error( $warning );
            }
        }
    }

    $next_thanks = get_option( 'qtranslate_next_thanks' );
    if ( $next_thanks !== false && $next_thanks < time() ) {
        $messages = get_option( 'qtranslate_admin_notices' );
        if ( isset( $messages['next_thanks'] ) ) {
            unset( $messages['next_thanks'] );
            update_option( 'qtranslate_admin_notices', $messages );
        }
        $next_thanks = false;
    }
    if ( $next_thanks === false ) {
        $next_thanks = strtotime( '+' . rand( 100, 300 ) . 'days' );
        update_option( 'qtranslate_next_thanks', $next_thanks );
    }

    if ( $q_config['auto_update_mo'] ) {
        qtranxf_update_gettext_databases();
    }
}

/**
 * load field configurations for the current admin page
 */
function qtranxf_get_admin_page_config() {
    global $q_config, $pagenow;
    if ( isset( $q_config['i18n-cache']['admin_page_configs'] ) ) {
        return $q_config['i18n-cache']['admin_page_configs'];
    }

    $admin_config = $q_config['admin_config'];
    /**
     * Customize the admin configuration for all pages.
     *
     * @param (array) $admin_config token 'admin-config' of the configuration.
     */
    $admin_config = apply_filters( 'qtranslate_admin_config', $admin_config );
    $admin_config = apply_filters_deprecated( 'i18n_admin_config', array( $admin_config ), '3.10.0', 'qtranslate_admin_config' );
    $admin_config = apply_filters_deprecated( 'qtranslate_load_admin_page_config', array( $admin_config ), '3.10.0', 'qtranslate_admin_config' );

    $url_query    = $q_config['url_info']['query'] ?? '';
    $page_configs = qtranxf_parse_page_config( $admin_config, $pagenow, $url_query );

    $q_config['i18n-cache']['admin_page_configs'] = $page_configs;

    return $page_configs;
}

function qtranxf_get_admin_page_config_post_type( $post_type ) {
    global $q_config, $pagenow;
    static $page_config; // cache
    if ( ! is_null( $page_config ) ) {
        return $page_config;
    }
    if ( ! empty( $q_config['post_type_excluded'] ) ) {
        switch ( $pagenow ) {
            case 'post.php':
            case 'post-new.php':
                if ( in_array( $post_type, $q_config['post_type_excluded'] ) ) {
                    $page_config = array();

                    return $page_config;
                }
                break;
            default:
                break;
        }
    }
    $page_configs = qtranxf_get_admin_page_config();

    $page_config = $page_configs[''] ?? array();
    if ( $post_type ) {
        foreach ( $page_configs as $key => $cfg ) {
            if ( empty( $key ) ) {
                continue;
            }
            if ( isset( $cfg['post_type'] ) ) {
                $cfg_post_type = $cfg['post_type'];
                unset( $cfg['post_type'] );
            } else {
                $cfg_post_type = $key;
            }
            $matched = qtranxf_match_post_type( $cfg_post_type, $post_type );
            if ( $matched === false ) {
                continue;
            }
            if ( is_null( $matched ) ) {
                $page_config = array();
                break;
            }
            $page_config = qtranxf_merge_config( $page_config, $cfg );
        }
    }

    unset( $page_config['filters'] );

    if ( ! empty( $page_config ) ) {
        // clean up empty items
        if ( ! empty( $page_config['forms'] ) ) {
            foreach ( $page_config['forms'] as $form_id => &$form ) {
                if ( ! isset( $form['fields'] ) ) {
                    continue;
                }
                foreach ( $form['fields'] as $key => $field ) {
                    if ( isset( $field['encode'] ) && $field['encode'] == 'none' ) {
                        unset( $form['fields'][ $key ] );
                    }
                    if ( $post_type && ! empty( $field['post-type-excluded'] ) && preg_match( '/' . $field['post-type-excluded'] . '/', $post_type ) ) {
                        unset( $form['fields'][ $key ] );
                    }
                }
                foreach ( $form as $key => $token ) {
                    if ( empty( $token ) ) {
                        unset( $form[ $key ] );
                    }
                }
                if ( empty( $form ) ) {
                    unset( $page_config['forms'][ $form_id ] );
                }
            }
        }
        foreach ( $page_config as $key => $cfg ) {
            if ( empty( $cfg ) ) {
                unset( $page_config[ $key ] );
            }
        }
    }

    if ( ! empty( $page_config ) ) {
        $page_config['js'] = array();
        if ( isset( $page_config['js-conf'] ) ) {
            foreach ( $page_config['js-conf'] as $key => $js ) {
                if ( ! isset( $js['handle'] ) ) {
                    $js['handle'] = $key;
                }
                $page_config['js'][] = $js;
            }
            unset( $page_config['js-conf'] );
        }

        $page_config['js'][] = array( 'handle' => 'qtranslate-admin-main', 'src' => './dist/main.js' );

        if ( isset( $page_config['js-exec'] ) ) {
            foreach ( $page_config['js-exec'] as $key => $js ) {
                if ( ! isset( $js['handle'] ) ) {
                    $js['handle'] = $key;
                }
                $page_config['js'][] = $js;
            }
            unset( $page_config['js-exec'] );
        }

        // make src to be relative to WP_CONTENT_DIR
        $bnm         = qtranxf_plugin_dirname_from_wp_content();
        $content_dir = trailingslashit( WP_CONTENT_DIR );
        foreach ( $page_config['js'] as $key => $js ) {
            if ( ! isset( $js['src'] ) ) {
                continue;
            }
            $src = $js['src'];
            if ( $src[0] == '.' && ( $src[1] == '/' || $src[1] == DIRECTORY_SEPARATOR ) ) {
                $page_config['js'][ $key ]['src'] = $bnm . substr( $src, 1 );
            } else {
                if ( file_exists( $content_dir . $src ) ) {
                    continue; // from WP_CONTENT_DIR as expected
                }
                $fp = dirname( $bnm ) . '/' . $src;  // from 'plugins' folder
                if ( file_exists( $content_dir . $fp ) ) {
                    $page_config['js'][ $key ]['src'] = $fp;
                    continue;
                }
                $fp = $bnm . '/' . $src; // from this plugin folder
                if ( file_exists( $content_dir . $fp ) ) {
                    $page_config['js'][ $key ]['src'] = $fp;
                    continue;
                }
                if ( file_exists( $src ) ) {
                    // absolute path was given
                    if ( qtranxf_startsWith( $src, $content_dir ) ) {
                        $fp                               = substr( $src, strlen( $content_dir ) );
                        $page_config['js'][ $key ]['src'] = $fp;
                        continue;
                    }
                }
                unset( $page_config['js'][ $key ] );
                qtranxf_error_log( sprintf( __( 'Could not find script file "%s" for handle "%s".', 'qtranslate' ), $src, $js['handle'] ) );
            }
        }
    }

    qtranxf_write_config_log( $page_config, '', $pagenow, '', $post_type );

    return $page_config;
}

function qtranxf_admin_footer() {
    global $q_config;
    $post_type   = qtranxf_post_type();
    $page_config = qtranxf_get_admin_page_config_post_type( $post_type );
    if ( empty( $page_config ) ) {
        return;
    }

    // autosave script saves the active language only and messes it up later in a hard way
    wp_dequeue_script( 'autosave' );
    wp_deregister_script( 'autosave' );

    $config = array();
    $config['page_config'] = $page_config;
    unset( $config['page_config']['js'] );  // No need for javascript.
    // TODO missing 'term_name' ?
    $keys = array(
        'default_language',
        'language',
        'url_mode',
        'hide_default_language'
    );
    foreach ( $keys as $key ) {
        $config[ $key ] = $q_config[ $key ];
    }
    $config['lsb_style_subitem']      = ( $q_config['lsb_style'] == QTX_LSB_STYLE_SIMPLE_BUTTONS ) ? 'button' : '';
    $config['lsb_style_active_class'] = ( $q_config['lsb_style'] == QTX_LSB_STYLE_TABS_IN_BLOCK ) ? 'wp-ui-highlight' : 'active';
    $config['lsb_style_wrap_class']   = ( $q_config['lsb_style'] == QTX_LSB_STYLE_TABS_IN_BLOCK ) ? 'wp-ui-primary' : '';

    $config['custom_fields']        = apply_filters( 'qtranslate_custom_fields', $q_config['custom_fields'] );
    $config['custom_field_classes'] = apply_filters( 'qtranslate_custom_field_classes', $q_config['custom_field_classes'] );
    if ( $q_config['url_mode'] == QTX_URL_DOMAINS ) {
        $config['domains'] = $q_config['domains'];
    }
    $homeinfo                = qtranxf_get_home_info();
    $config['homeinfo_path'] = trailingslashit( $homeinfo['path'] );
    $config['home_url_path'] = parse_url( home_url( '/' ), PHP_URL_PATH ); // TODO optimize
    $config['flag_location'] = qtranxf_flag_location();
    $config['js']            = array();

    $config['strings'] = array();
    // translators: The beginning of the prompt on hover over an LSB. This string is appended with a edit-language name in admin language, so that the space at the end matters.
    $config['strings']['ShowIn'] = __( 'Show multilingual content in ', 'qtranslate' );

    $config['language_config'] = array();
    $language_config           = &$config['language_config'];
    foreach ( $q_config['enabled_languages'] as $lang ) {
        $language_config[ $lang ] = array();
        $lang_cfg                 = &$language_config[ $lang ];
        $lang_cfg['flag']         = $q_config['flag'][ $lang ];
        $lang_cfg['name']         = $q_config['language_name'][ $lang ];
        $lang_cfg['locale']       = $q_config['locale'][ $lang ];
        $lang_cfg['locale_html']  = ! empty( $q_config['locale_html'][ $lang ] ) ? $q_config['locale_html'][ $lang ] : $lang;
        $lang_cfg['admin_name']   = qtranxf_getLanguageName( $lang );
    }

    // For Gutenberg, enforce the editor mode to QTX_EDITOR_MODE_SINGLE
    $current_screen = get_current_screen();
    if ( method_exists( $current_screen, 'is_block_editor' ) && $current_screen->is_block_editor() ) {
        $config['LSB'] = false;
        $config['RAW'] = false;
    } else {
        $config['LSB'] = $q_config['editor_mode'] == QTX_EDITOR_MODE_LSB;
        $config['RAW'] = $q_config['editor_mode'] == QTX_EDITOR_MODE_RAW;
    }

    if ( empty( $q_config['hide_lsb_copy_content'] ) ) {
        // translators: Prompt on hover over button "Copy From" to copy content from other language
        $config['strings']['CopyFromAlt'] = __( 'Fill empty multilingual fields with content from other language', 'qtranslate' );
        // translators: Prompt on hover over select-element to choose the language to copy content from
        $config['strings']['ChooseLangToCopy'] = __( 'Choose language to copy multilingual content from', 'qtranslate' );
        // translators: Title of button to copy content from other language
        $config['strings']['CopyFrom'] = __( 'Copy from', 'qtranslate' );
    } else {
        $config['hide_lsb_copy_content'] = true;
    }

    $config['lang_code_format'] = QTX_LANG_CODE_FORMAT;

    $config = apply_filters_deprecated( 'qtranslate_admin_page_config', array( $config ), '3.14.0', '',
        'No clear use case, create a request on https://github.com/qtranslate/qtranslate-xt/issues if needed.' );

    qtranxf_enqueue_scripts( $page_config['js'] );
    ?>
    <script>
        // <![CDATA[
        <?php
        echo 'var qTranslateConfig=' . json_encode( $config ) . ';' . PHP_EOL;
        // each script entry may define javascript code to be injected
        foreach ( $page_config['js'] as $js ) {
            if ( ! empty( $js['javascript'] ) ) {
                echo $js['javascript'];
            }
        }
        if ( $q_config['qtrans_compatibility'] ) {
            echo 'qtrans_use = function(lang, text) { var result = qtranxj_split(text); return result[lang]; }' . PHP_EOL;
        }
        do_action( 'qtranslate_add_admin_footer_js' );
        ?>
        //]]>
    </script>
    <?php
}

/**
 * Echo CSS code for the flag icons of the active languages.
 *
 * @return void
 */
function qtranxf_add_admin_lang_icons() {
    global $q_config;

    $flag_location = qtranxf_flag_location();
    echo '<style>' . PHP_EOL;
    echo "#wpadminbar #wp-admin-bar-language>div.ab-item{ background-size: 0;";
    echo 'background-image: url(' . $flag_location . $q_config['flag'][ $q_config['language'] ] . ');}' . PHP_EOL;
    foreach ( $q_config['enabled_languages'] as $language ) {
        echo '#wpadminbar ul li#wp-admin-bar-' . $language . ' {background-size: 0; background-image: url(' . $flag_location . $q_config['flag'][ $language ] . '); margin-right: 5px; }' . PHP_EOL;
    }
    echo '</style>' . PHP_EOL;
}

/**
 * Echo CSS code to highlight the translatable fields.
 *
 * @return void
 */
function qtranxf_add_admin_highlight_css() {
    global $q_config;

    if ( $q_config['highlight_mode'] == QTX_HIGHLIGHT_MODE_NONE || get_the_author_meta( 'qtranslate_highlight_disabled', get_current_user_id() ) ) {
        return;
    }
    $highlight_mode = $q_config['highlight_mode'];
    switch ( $highlight_mode ) {
        case QTX_HIGHLIGHT_MODE_CUSTOM_CSS:
            $css = $q_config['highlight_mode_custom_css'];
            break;
        default:
            $css = qtranxf_get_admin_highlight_css( $highlight_mode );
            break;
    }
    $current_color_scheme = qtranxf_get_user_admin_color();
    foreach ( $current_color_scheme as $key => $color ) {
        $css = preg_replace( '/#UserColor' . $key . '/m', $color, $css );
    }
    echo '<style media="screen">' . PHP_EOL;
    echo $css;
    do_action_deprecated( 'qtranslate_admin_css', array(), '3.10.0', 'admin_enqueue_scripts', 'Discourage internal CSS' );
    echo '</style>' . PHP_EOL;
}

/**
 * Retrieve the CSS as string for a highlight mode corresponding to a preset.
 *
 * @param int $highlight_mode
 *
 * @return string
 */
function qtranxf_get_admin_highlight_css( int $highlight_mode ): string {
    $css = 'input.qtranxs-translatable, textarea.qtranxs-translatable, div.qtranxs-translatable, span.qtranxs-translatable {' . PHP_EOL;
    switch ( $highlight_mode ) {
        case QTX_HIGHLIGHT_MODE_BORDER_LEFT:
            $css .= 'border-left: 3px solid #UserColor2 !important;' . PHP_EOL;
            break;
        case QTX_HIGHLIGHT_MODE_BORDER:
            $css .= 'border: 1px solid #UserColor2 !important;' . PHP_EOL;
            break;
        case QTX_HIGHLIGHT_MODE_LEFT_SHADOW:
            $css .= 'box-shadow: -3px 0 #UserColor2 !important;' . PHP_EOL;
            break;
        case QTX_HIGHLIGHT_MODE_OUTLINE:
            $css .= 'outline: 2px solid #UserColor2 !important;' . PHP_EOL;
            break;
        default:
            assert( false ); // Unexpected value for this function that handles presets only.
    }
    $css .= '}' . PHP_EOL;

    return $css;
}

function qtranxf_admin_enqueue_scripts() {
    global $q_config;
    wp_register_style( 'qtranslate-admin', plugins_url( 'css/admin.css', QTRANSLATE_FILE ), array(), QTX_VERSION );
    wp_enqueue_style( 'qtranslate-admin' );
    wp_register_style( 'qtranslate-admin-lsb', plugins_url( 'css/lsb/' . $q_config['lsb_style'], QTRANSLATE_FILE ), array(), QTX_VERSION );
    wp_enqueue_style( 'qtranslate-admin-lsb' );
    qtranxf_add_admin_lang_icons();
    qtranxf_add_admin_highlight_css();

    if ( qtranxf_admin_is_config_page() ) {
        wp_enqueue_script( 'qtranslate-admin-options', plugins_url( 'dist/options.js', QTRANSLATE_FILE ), array(), QTX_VERSION );
    }
}

function qtranxf_customize_allowed_urls( $urls ) {
    global $q_config;

    $home   = home_url( '/', is_ssl() ? 'https' : 'http' );
    $urls[] = $home;
    foreach ( $q_config['enabled_languages'] as $lang ) {
        $url    = qtranxf_convertURL( $home, $lang, true, true );
        $urls[] = $url;
    }
    if ( $q_config['hide_default_language'] ) {
        $urls[] = qtranxf_convertURL( $home, $q_config['default_language'], true, false );
    }

    return $urls;
}

/** @since 3.4 */
function qtranxf_settings_page() {
    require_once QTRANSLATE_DIR . '/src/admin/admin_settings.php';
    $admin_settings = new QTX_Admin_Settings();
    $admin_settings->display();
}

/**
 * @since 3.3.8.7
 */
function qtranxf_translate_menu( &$menu ) {
    global $q_config;
    $lang = $q_config['language'];
    foreach ( $menu as &$item ) {
        if ( empty( $item[0] ) ) {
            continue;
        }
        $item[0] = qtranxf_use_language( $lang, $item[0] );
    }
}

/**
 * Adds Management Interface and translates admin menu.
 */
function qtranxf_admin_menu() {
    global $menu, $submenu;
    if ( ! empty( $menu ) ) {
        qtranxf_translate_menu( $menu );
    }
    if ( ! empty( $submenu ) ) {
        foreach ( $submenu as $key => $item ) {
            qtranxf_translate_menu( $submenu[ $key ] );
        }
    }

    add_options_page( __( 'Language Management', 'qtranslate' ), __( 'Languages', 'qtranslate' ), 'manage_options', 'qtranslate-xt', 'qtranxf_settings_page' );
}

/* Add a metabox in admin menu page */
function qtranxf_nav_menu_metabox( $object ) {
    global $nav_menu_selected_id;

    $elems = array( '#qtransLangSwLM#' => __( 'Language Menu', 'qtranslate' ) );

    class qtranxcLangSwItems {
        public $db_id = 0;
        public $object = 'qtranslangsw';
        public $object_id;
        public $menu_item_parent = 0;
        public $type = 'custom';
        public $title;// = 'Language';
        public $label;
        public $url;
        public $target = '';
        public $attr_title = '';
        public $classes = array();
        public $xfn = '';
    }

    $elems_obj = array();
    foreach ( $elems as $value => $title ) {
        $elems_obj[ $title ] = new qtranxcLangSwItems();
        $obj                 = &$elems_obj[ $title ];
        $obj->object_id      = esc_attr( $value );
        if ( empty( $obj->title ) ) {
            $obj->title = esc_attr( $title );
        }
        $obj->label = esc_attr( $title );
        $obj->url   = esc_attr( $value );
    }

    $walker = new Walker_Nav_Menu_Checklist();
    ?>
    <div id="qtranxs-langsw" class="qtranxslangswdiv">
        <div id="tabs-panel-qtranxs-langsw-all" class="tabs-panel tabs-panel-view-all tabs-panel-active">
            <ul id="qtranxs-langswchecklist" class="list:qtranxs-langsw categorychecklist form-no-clear">
                <?php echo walk_nav_menu_tree( array_map( 'wp_setup_nav_menu_item', $elems_obj ), 0, (object) array( 'walker' => $walker ) ) ?>
            </ul>
        </div>
        <span class="list-controls hide-if-no-js">
		<a href="javascript:void(0);" class="help"
           onclick="jQuery( '#qtranxs-langsw-help' ).toggle();"><?php _e( 'Help', 'qtranslate' ) ?></a>
		<p class="hide-if-js" id="qtranxs-langsw-help">
				<?php
                echo __( 'Menu item added is replaced with a drop-down menu of available languages, when menu is rendered.', 'qtranslate' );
                echo ' ';
                printf( __( 'The rendered menu items have CSS classes %s and %s ("%s" is a language code), which can be defined in theme style, if desired. The label of language menu can also be customized via field "%s" in the menu configuration.', 'qtranslate' ), '.qtranxs-lang-menu, .qtranxs-lang-menu-xx, .qtranxs-lang-menu-item', '.qtranxs-lang-menu-item-xx', 'xx', qtranxf_translate_wp( 'Navigation Label' ) );
                echo ' ';
                printf( __( 'The field "%s" of inserted menu item allows additional configuration described in our %sWiki%s.', 'qtranslate' ), qtranxf_translate_wp( 'URL' ), '<a href="https://github.com/qtranslate/qtranslate-xt/wiki/Front-language-switching#language-switcher-menu" target="_blank">', '</a>' ) ?>
		</p>
	</span>
        <p class="button-controls">
		<span class="add-to-menu">
			<input type="submit"<?php disabled( $nav_menu_selected_id, 0 ) ?>
                   class="button-secondary submit-add-to-menu right"
                   value="<?php esc_attr_e( 'Add to Menu', 'qtranslate' ) ?>" name="add-qtranxs-langsw-menu-item"
                   id="submit-qtranxs-langsw"/>
			<span class="spinner"></span>
		</span>
        </p>
    </div>
    <?php
}

function qtranxf_add_nav_menu_metabox() {
    add_meta_box( 'add-qtranxs-language-switcher', __( 'Language Switcher', 'qtranslate' ), 'qtranxf_nav_menu_metabox', 'nav-menus', 'side', 'default' );
}

function qtranxf_add_language_menu( $wp_admin_bar ) {
    global $q_config;
    if ( ! is_admin() || ! is_admin_bar_showing() ) {
        return;
    }

    if ( wp_is_mobile() ) {
        $title = '';
    } else {
        $title = $q_config['language_name'][ $q_config['language'] ];
    }

    $wp_admin_bar->add_menu( array(
            'id'     => 'language',
            'parent' => 'top-secondary',
            'title'  => $title
        )
    );

    foreach ( $q_config['enabled_languages'] as $language ) {
        $wp_admin_bar->add_menu(
            array
            (
                'id'     => $language,
                'parent' => 'language',
                'meta'   => [
                    'rel' => $language
                ],
                'title'  => $q_config['language_name'][ $language ],
                'href'   => add_query_arg( 'lang', $language )
            )
        );
    }
}

function qtranxf_links( $links, $file, $plugin_data, $context ) {
    // translators: expected in WordPress default textdomain
    $settings_link = '<a href="options-general.php?page=qtranslate-xt">' . qtranxf_translate_wp( 'Settings' ) . '</a>';
    array_unshift( $links, $settings_link ); // before other links

    return $links;
}

function qtranxf_admin_notices_config() {
    global $q_config;
    if ( empty( $q_config['url_info']['errors'] ) &&
         empty( $q_config['url_info']['warnings'] ) &&
         empty( $q_config['url_info']['messages'] ) ) {
        return;
    }

    $screen = get_current_screen();
    if ( isset( $screen->id ) && $screen->id == 'settings_page_qtranslate-xt' ) {
        $qtitle = '';
    } else {
        $qlink  = admin_url( 'options-general.php?page=qtranslate-xt' );
        $qtitle = '<a href="' . $qlink . '">qTranslate&#8209;XT</a>:&nbsp;';
    }
    $fmt = '<div class="notice notice-%1$s is-dismissible" id="qtranxs-%2$s-%1$s"><p>' . $qtitle . '%3$s</p></div>' . PHP_EOL;

    if ( isset( $q_config['url_info']['errors'] ) ) {
        if ( is_array( $q_config['url_info']['errors'] ) ) {
            // translators: Colon after a title. Template reused from language menu item.
            $hdr = sprintf( __( '%s:', 'qtranslate' ), '<strong>' . __( 'Error', 'qtranslate' ) . '</strong>' ) . '&nbsp;';
            foreach ( $q_config['url_info']['errors'] as $key => $msg ) {
                printf( $fmt, 'error', $key, $hdr . $msg );
            }
        }
        unset( $q_config['url_info']['errors'] );
    }
    if ( isset( $q_config['url_info']['warnings'] ) ) {
        if ( is_array( $q_config['url_info']['warnings'] ) ) {
            // translators: Colon after a title. Template reused from language menu item.
            $hdr = sprintf( __( '%s:', 'qtranslate' ), '<strong>' . __( 'Warning', 'qtranslate' ) . '</strong>' ) . '&nbsp;';
            foreach ( $q_config['url_info']['warnings'] as $key => $msg ) {
                printf( $fmt, 'warning', $key, $hdr . $msg );
            }
        }
        unset( $q_config['url_info']['warnings'] );
    }
    if ( isset( $q_config['url_info']['messages'] ) ) {
        if ( is_array( $q_config['url_info']['messages'] ) ) {
            foreach ( $q_config['url_info']['messages'] as $key => $msg ) {
                printf( $fmt, 'info', $key, $msg );
            }
        }
        unset( $q_config['url_info']['messages'] );
    }
}

/**
 * Encode front end language on home_url, since, on admin side, it is mostly in use to create links to a preview pages.
 * @since 3.4.5
 */
function qtranxf_admin_home_url( $url, $path, $orig_scheme, $blog_id ) {
    global $q_config;

    // TODO clarify why don't we use QTX_COOKIE_NAME_ADMIN instead?
    if ( ! $q_config['disable_client_cookies'] && isset( $_COOKIE[ QTX_COOKIE_NAME_FRONT ] ) ) {
        $lang = $_COOKIE[ QTX_COOKIE_NAME_FRONT ];
    } else {
        $lang = $q_config['default_language'];
    }
    return qtranxf_get_url_for_language( $url, $lang, ! $q_config['hide_default_language'] || $lang != $q_config['default_language'] );
}

function qtranxf_admin_footer_text( $text ) {
    if ( qtranxf_admin_is_config_page() ) {
        $msg  = sprintf( __( 'Thank you for using plugin %s!', 'qtranslate' ), '<strong>qTranslate&#8209;XT</strong>' );
        $text = '<span id="footer-thankyou">' . $msg . '</span>';
    }

    return $text;
}

function qtranxf_admin_footer_update( $text ) {
    if ( qtranxf_admin_is_config_page() ) {
        $text        = sprintf( __( 'Plugin Version %s', 'qtranslate' ), QTX_VERSION );
        $current     = get_site_transient( 'update_plugins' );
        $plugin_file = plugin_basename( QTRANSLATE_FILE );
        if ( isset( $current->response[ $plugin_file ] ) ) {
            $data = $current->response[ $plugin_file ];
            if ( is_plugin_active_for_network( $plugin_file ) ) {
                $url = network_admin_url( 'update-core.php' );
            } else {
                $url = admin_url( 'update-core.php' );
            }
            $text .= '&nbsp;<strong><a href="' . $url . '">';
            $text .= sprintf( _x( 'Get %s', '%s is a version number of a plugin. It is a shortcut for "Get version %s of such a such plugin."', 'qtranslate' ), $data->new_version );
            $text .= '</a></strong>';
        }
    }

    return $text;
}

/**
 * Initialize qTranslate qtx in JS to set the content hooks just before the call to tinymce.init.
 * This anticipated qtx init sequence runs before the usual ready/load events, but still in the footer so the content is
 * supposed to be available for a proper initialization of qTranslate.
 */
function qtranxf_admin_tiny_mce_init( $mce_settings ) {
    if ( isset( $mce_settings ) ):
        ?>
        <script>
            if (window.qTranslateConfig !== undefined && window.qTranslateConfig.js !== undefined)
                window.qTranslateConfig.js.get_qtx();
        </script>
    <?php
    endif;
}

function qtranxf_admin_load() {
    qtranxf_admin_load_config();

    $basename = plugin_basename( QTRANSLATE_FILE );
    add_filter( 'plugin_action_links_' . $basename, 'qtranxf_links', 10, 4 );
    // should be executed after all plugins loaded their *-admin.php
    add_action( 'qtranslate_init_language', 'qtranxf_load_admin_page_config', 20 );

    global $q_config, $pagenow;
    if ( $q_config['url_mode'] != QTX_URL_QUERY // otherwise '?' may interfere with WP code
         && $pagenow == 'customize.php'
    ) {
        add_filter( 'home_url', 'qtranxf_admin_home_url', 5, 4 );
    }

    // Caution:  we are being called in 'plugins_loaded' from core with a higher priority, but we add a later hook
    add_action( 'plugins_loaded', 'qtranxf_collect_translations_posted', 5 );
    add_action( 'admin_init', 'qtranxf_admin_init', 2 );
    add_action( 'admin_enqueue_scripts', 'qtranxf_admin_enqueue_scripts' );
    add_action( 'admin_footer', 'qtranxf_admin_footer', 999 );
    add_filter( 'admin_footer_text', 'qtranxf_admin_footer_text', 99 );
    add_filter( 'update_footer', 'qtranxf_admin_footer_update', 99 );
    add_action( 'wp_tiny_mce_init', 'qtranxf_admin_tiny_mce_init' );

    // after POST & GET are set, and before all WP objects are created, alternatively can use action 'setup_theme' instead.
    add_action( 'sanitize_comment_cookies', 'qtranxf_decode_translations_posted', 5 );
    add_filter( 'customize_allowed_urls', 'qtranxf_customize_allowed_urls' );

    add_action( 'admin_head-nav-menus.php', 'qtranxf_add_nav_menu_metabox' );
    add_action( 'admin_menu', 'qtranxf_admin_menu', 999 );
    add_action( 'admin_bar_menu', 'qtranxf_add_language_menu', 999 );
    add_action( 'wp_before_admin_bar_render', 'qtranxf_before_admin_bar_render' );

    add_action( 'wp_ajax_admin_debug_info', 'qtranxf_admin_debug_info' );

    require_once QTRANSLATE_DIR . '/src/admin/block_editor.php';

    // Disable the block editor from managing widgets, including the Gutenberg plugin
    add_filter( 'gutenberg_use_widgets_block_editor', '__return_false', 99 );
    add_filter( 'use_widgets_block_editor', '__return_false', 99 );
}
