function qtranxf_resetConfig()
{
    global $qtranslate_options;
    if (!current_user_can('manage_options')) {
        return;
    }
    if (isset($_POST['qtranslate_reset_admin_notices'])) {
        delete_option('qtranslate_admin_notices');
        qtranxf_add_message(__('Admin notices have been reset. You will see all applicable notices on admin pages and may dismiss them again.', 'qtranslate'));
    }
    if (!isset($_POST['qtranslate_reset']) || !isset($_POST['qtranslate_reset2'])) {
        return;
    }
    // reset all settings
    foreach ($qtranslate_options['front'] as $ops) {
        foreach ($ops as $nm => $def) {
            delete_option('qtranslate_' . $nm);
        }
    }
    foreach ($qtranslate_options['admin'] as $ops) {
        foreach ($ops as $nm => $def) {
            delete_option('qtranslate_' . $nm);
        }
    }
    foreach ($qtranslate_options['default_value'] as $nm => $def) {
        delete_option('qtranslate_' . $nm);
    }
    foreach ($qtranslate_options['languages'] as $nm => $opn) {
        delete_option($opn);
    }
    // internal private options not loaded by default
    delete_option('qtranslate_next_update_mo');
    delete_option('qtranslate_next_thanks');
    // obsolete options
    delete_option('qtranslate_custom_pages');
    delete_option('qtranslate_plugin_js_composer_off');
    delete_option('qtranslate_widget_css');
    delete_option('qtranslate_version');
    delete_option('qtranslate_disable_header_css');
    if (isset($_POST['qtranslate_reset3'])) {
        delete_option('qtranslate_term_name');
        if (isset($_POST['qtranslate_reset4'])) {
            //not implemented yet
            delete_option('qtranslate_version_previous');
            //and delete translations in posts
        }
    }
    remove_filter('locale', 'qtranxf_localeForCurrentLanguage', 99);
    qtranxf_reloadConfig();
    add_filter('locale', 'qtranxf_localeForCurrentLanguage', 99);
}
function qtranxf_migrate_export_qtranslate_slug()
{
    //qtranxf_dbg_log('qtranxf_migrate_export_qtranslate_slug: REQUEST_TIME_FLOAT: ', $_SERVER['REQUEST_TIME_FLOAT']);
    $nm = '<a href="https://wordpress.org/plugins/qtranslate-slug/" target="_blank"><span style="color:blue"><strong>QTranslate Slug</strong></span></a>';
    qtranxf_add_message(sprintf(__('Applicable options and slug data have been exported to plugin %s.', 'qtranslate'), $nm));
}
function qtranxf_migrate_export($plugin_name, $nm_to)
{
    qtranxf_migrate_options_copy($nm_to, 'qtranslate');
    $nm = '<span style="color:blue"><strong>' . $plugin_name . '</strong></span>';
    qtranxf_add_message(sprintf(__('Applicable options have been exported to plugin %s. If you have done some post or page updates after migrating from %s, then "%s" operation is also required to convert the content to "dual language tag" style in order for plugin %s to function.', 'qtranslate'), $nm, $nm, '<a href="https://qtranslatexteam.wordpress.com/option-convert-database/" target="_blank"><span style="color:magenta">' . __('Convert Database', 'qtranslate') . '</span></a>', $nm));
}
function qtranxf_migrate_import_qtranslate_slug($default_language)
{
    //$q_config is not yet available
    global $wpdb;
    //qtranxf_dbg_log('qtranxf_migrate_import_qtranslate_slug: ');
    $nm = '<a href="https://wordpress.org/plugins/qtranslate-slug/" target="_blank"><span style="color:blue"><strong>QTranslate Slug</strong></span></a>';
    $wpdb->show_errors();
    @set_time_limit(0);
    $qts_options = get_option('qts_options');
    if (!empty($qts_options)) {
        //qtranxf_dbg_log('qtranxf_migrate_import_qtranslate_slug: $qts_options: ', $qts_options);
        if (is_array($qts_options)) {
            foreach ($qts_options as $k => $v) {
            }
        } else {
            qtranxf_error_log(sprintf(__('Failed to import options from plugin %s.', 'qtranslate'), $nm));
        }
    }
    $sql = 'SELECT ID, post_name, post_type, post_parent, meta_key, meta_value FROM ' . $wpdb->postmeta . ' as m INNER JOIN ' . $wpdb->posts . ' as p ON p.ID = m.post_id WHERE p.post_status = "publish" AND p.post_name != "" AND m.meta_key LIKE "_qts_slug___" AND m.meta_value IS NOT NULL';
    $sql .= ' AND NOT EXISTS (SELECT * FROM ' . $wpdb->prefix . 'i18n_slugs WHERE name = p.post_name AND lang = MID(m.meta_key,11))';
    $result = $wpdb->get_results($sql);
    //qtranxf_dbg_log('qtranxf_migrate_import_qtranslate_slug: $result: ', $result);
    //qtranxf_dbg_log('qtranxf_migrate_import_qtranslate_slug: count($result): ', count($result));
    if (!is_array($result)) {
        qtranxf_error_log(sprintf(__('Failed to import data from plugin %s.', 'qtranslate'), $nm) . ' ' . sprintf(__('It might be a good idea to review %smigration instructions%s, if you have not yet done so.', 'qtranslate'), '<a href="https://qtranslatexteam.wordpress.com/migration/" target="_blank">', '</a>'));
        return;
    }
    foreach ($result as $row) {
        $name = $row->post_name;
        if (empty($name)) {
            continue;
        }
        $slug = $row->meta_value;
        if (empty($slug)) {
            continue;
        }
        $lang = substr($row->meta_key, -2);
        if ($lang != $default_language) {
            continue;
        }
        if ($slug == $name) {
            continue;
        }
        //qtranxf_dbg_log('qtranxf_migrate_import_qtranslate_slug: default language $slug('.$slug.') != $name('.$name.')');
        $slug = wp_unique_post_slug($slug, $row->ID, 'publish', $row->post_type, $row->post_parent);
        $wpdb->query($wpdb->prepare('UPDATE ' . $wpdb->posts . ' SET post_name = %s WHERE ID = %d', $slug, $row->ID));
        $row->post_name = $row->meta_value = $slug;
    }
    $cnt = 0;
    $cnt_renamed = 0;
    $lst = '';
    $sql = 'INSERT INTO ' . $wpdb->prefix . 'i18n_slugs (slug, lang, name) VALUES (%s, %s, %s)';
    foreach ($result as $row) {
        $lang = substr($row->meta_key, -2);
        if ($lang == $default_language) {
            continue;
        }
        $name = $row->post_name;
        if (empty($name)) {
            continue;
        }
        $slug = $row->meta_value;
        if (empty($slug)) {
            continue;
        }
        if (!qtranxf_isEnabled($lang)) {
            continue;
        }
        $slug = qtranxf_slug_unique($row->meta_value, $lang, $name);
        if ($slug != $row->meta_value) {
            $lst .= $row->ID . '\\t' . $name . '\\t' . $lang . '\\t' . $row->meta_value . ' => ' . $slug . PHP_EOL;
            ++$cnt_renamed;
        }
        //qtranxf_dbg_log('qtranxf_migrate_import_qtranslate_slug: $lang='.$lang.'; row: ', $row);
        $query = $wpdb->prepare($sql, $slug, $lang, $row->post_name);
        $wpdb->query($query);
        ++$cnt;
    }
    $msg = '';
    if ($cnt != 0) {
        $msg .= sprintf(__('Applicable options and slug data from plugin %s have been imported.', 'qtranslate'), $nm);
    }
    //if(!empty($lst))){
    $upload_dir = wp_upload_dir();
    //qtranxf_dbg_log('qtranxf_migrate_import_qtranslate_slug: upload_dir: ',$upload_dir);
    $fnm = '/qts-qtx-report-of-renamed.log';
    $fn = $upload_dir['basedir'] . $fnm;
    //[01-Nov-2015 02:21:57 UTC]
    error_log(date('[d-M-Y H:i:s T]') . ': Slugs renamed during import:' . PHP_EOL . "Post_ID\tpost_name\tLANG\tQtranslate Slug => qTranslate-X Slug" . PHP_EOL . $lst . PHP_EOL, 3, $fn);
    $url = $upload_dir['baseurl'] . $fnm;
    $msg .= ' ' . sprintf(__('A number of post slugs have had to be renamed in order to provide uniqueness. The report of renamed slugs is saved in the file "%s".', 'qtranslate'), '<a href="' . $url . ' target="_blank">' . $url . '</a>');
    //}
    if (!empty($msg)) {
        $msg .= ' ' . sprintf(__('It might be a good idea to review %smigration instructions%s, if you have not yet done so.', 'qtranslate'), '<a href="https://qtranslatexteam.wordpress.com/migration/" target="_blank">', '</a>');
        qtranxf_add_message($msg);
    }
}