<?php

define('WPVIVID_IMPORT_EXPORT_DIR', 'ImportandExport');

class WPvivid_Export_Import
{
    public $main_tab;
    public $sub_tab;

    public $end_shutdown_function;

    public function __construct()
    {
        add_action('wp_ajax_wpvivid_export_post_step2', array($this, 'export_post_step2'));
        add_action('wp_ajax_wpvivid_export_post_step3', array($this, 'export_post_step3'));

        add_filter('wpvivid_get_toolbar_menus',array($this,'get_toolbar_menus'),21);
        add_filter('wpvivid_get_admin_menus',array($this,'get_admin_menus'),21);

        add_action('wp_ajax_wpvivid_export_now', array($this, 'export_now'));
        add_action('wp_ajax_wpvivid_prepare_export_post', array($this, 'prepare_export_post'));
        add_action('wp_ajax_wpvivid_export_list_tasks', array($this, 'list_tasks'));

        add_action('wp_ajax_wpvivid_get_post_list', array($this, 'get_list'));
        add_action('wp_ajax_wpvivid_get_post_list_page', array($this, 'get_list_page'));
        add_action('wp_ajax_wpvivid_get_import_list_page', array($this, 'get_import_list_page'));

        add_action('wp_ajax_wpvivid_get_export_list',array($this, 'get_export_list'));

        add_action('admin_head', array($this, 'my_admin_custom_styles'));

        add_action('wpvivid_handle_export_success',array($this,'handle_export_success'),10);
        add_action('wpvivid_handle_export_failed',array($this,'handle_export_failed'),10, 2);

        add_action('wp_ajax_wpvivid_delete_export_list',array($this,'delete_export_list'),10);

        add_filter('wpvivid_get_screen_ids',array($this,'get_screen_ids'),12);

        add_action('wp_ajax_wpvivid_start_import', array($this, 'start_import'));

        add_action('wp_ajax_wpvivid_download_export_backup', array($this, 'wpvivid_download_export_backup'));
        add_action('wp_ajax_wpvivid_check_import_file', array($this, 'check_import_file'));
        add_action('wp_ajax_wpvivid_upload_import_files',array($this,'upload_import_files'));
        add_action('wp_ajax_wpvivid_upload_import_file_complete', array($this, 'upload_import_file_complete'));
        add_action('wp_ajax_wpvivid_get_import_progress', array($this, 'get_import_progress'));
        add_action('wp_ajax_wpvivid_scan_import_folder', array($this, 'wpvivid_scan_import_folder'));
        add_action('wp_ajax_wpvivid_calc_import_folder_size', array($this, 'calc_import_folder_size'));
        add_action('wp_ajax_wpvivid_clean_import_folder', array($this, 'clean_import_folder'));
        //
        $this->end_shutdown_function = false;
    }

    public function get_screen_ids($screen_ids)
    {
        $screen_ids[]='wpvivid-backup_page_wpvivid-export-import';
        return $screen_ids;
    }

    public function get_toolbar_menus($toolbar_menus)
    {
        $admin_url = apply_filters('wpvivid_get_admin_url', '');

        $menu['id']='wpvivid_admin_menu_export_import';
        $menu['parent']='wpvivid_admin_menu';
        $menu['title']=__('Export & Import', 'wpvivid-backuprestore');
        $menu['tab']= 'admin.php?page=wpvivid-export-import';
        $menu['href']=$admin_url . 'admin.php?page=wpvivid-export-import';
        $menu['capability']='administrator';
        $menu['index']=4;
        $toolbar_menus[$menu['parent']]['child'][$menu['id']]=$menu;
        return $toolbar_menus;
    }

    public function get_admin_menus($submenus)
    {
        $submenu['parent_slug']=WPVIVID_PLUGIN_SLUG;
        $submenu['page_title']= 'WPvivid Backup';
        $submenu['menu_title']=__('Export & Import', 'wpvivid-backuprestore');
        $submenu['capability']='administrator';
        $submenu['menu_slug']='wpvivid-export-import';
        $submenu['index']=4;
        $submenu['function']=array($this, 'init_page');
        $submenus[$submenu['menu_slug']]=$submenu;
        return $submenus;
    }

    public function init_page()
    {
        ?>
        <div class="wrap" style="max-width:1720px;">
            <h1><?php
                $plugin_display_name = 'WPvivid Backup Plugin';
                $plugin_display_name = apply_filters('wpvivid_display_pro_name', $plugin_display_name);
                esc_html_e('WPvivid Backup Plugin', 'wpvivid-backuprestore');
                ?></h1>
            <div id="wpvivid_export_notice"></div>
            <?php
            $args['is_parent_tab']=1;
            $this->main_tab=new WPvivid_Tab_Page_Container();
            $this->main_tab->add_tab('Export','export',array($this, 'output_export'), $args);
            $this->main_tab->add_tab('Import','import',array($this, 'output_import'), $args);
            $this->main_tab->display();
            ?>
        </div>
        <?php
    }

    //export
    public function output_export()
    {
        $export_dir = WP_CONTENT_DIR.DIRECTORY_SEPARATOR.WPvivid_Setting::get_backupdir().DIRECTORY_SEPARATOR.WPVIVID_IMPORT_EXPORT_DIR;
        ?>
        <div class="postbox export-import-block">
            <div>
                <div class="wpvivid-element-space-bottom wpvivid-element-space-right" style="float: left;">
                    <img src="<?php echo esc_url(WPVIVID_PLUGIN_IMAGES_URL.'export-import.png'); ?>" style="width:50px;height:50px;">
                </div>
                <div style="box-sizing: border-box;">
                    <div class="wpvivid-text-space-bottom"><?php esc_html_e('Export posts or pages with images in bulk.', 'wpvivid-backuprestore'); ?>
                        <span class="wpvivid-feature-pro">
                            <a href="https://docs.wpvivid.com/export-content.html" target="_blank" style="text-decoration: none;"><?php esc_html_e('Learn more', 'wpvivid-backuprestore'); ?></a>
                        </span>
                    </div>
                    <div class="wpvivid-text-space-bottom"><?php esc_html_e('This will contain all of your posts, pages, comments, terms and images (original images, featured images and thumbnails).', 'wpvivid-backuprestore'); ?></div>
                    <div class="wpvivid-text-space-bottom"><strong><?php esc_html_e('Note:', 'wpvivid-backuprestore'); ?></strong>&nbsp<?php esc_html_e('Try to select fewer items when you are facing a shortage of server resources (typically presented as a timeout error).', 'wpvivid-backuprestore'); ?></div>
                    <div style="clear: both;"></div>
                </div>
                <div style="clear: both;"></div>
            </div>
            <div style="clear: both;"></div>

            <div style="background: #fff; border: 1px solid #e5e5e5; border-radius: 6px; margin-bottom: 10px; padding: 10px;">
                <div>
                    <?php
                    echo esc_html(sprintf('Exported files will be temporarily stored in %s directory', $export_dir));
                    ?>
                </div>
            </div>

            <div style="width:100%; border:1px solid #f1f1f1; float:left; box-sizing: border-box;margin-bottom:10px;">
                <div style="box-sizing: border-box; margin: 1px; background-color: #f1f1f1;"><h2><?php esc_html_e('Choose post type', 'wpvivid-backuprestore'); ?></h2></div>
            </div>
            <div style="clear: both;"></div>

            <div class="postbox wpvivid-element-space-bottom">
                <div class="wpvivid-export-type-provider wpvivid-export-type-post wpvivid-export-type-provider-active" onclick="wpvivid_select_export_type('post');">
                    <?php esc_html_e('Post', 'wpvivid-backuprestore'); ?>
                </div>
                <div class="wpvivid-export-type-provider wpvivid-export-type-page" onclick="wpvivid_select_export_type('page');">
                    <?php esc_html_e('Page', 'wpvivid-backuprestore'); ?>
                </div>
                <div class="wpvivid-export-type-provider">
                    <?php esc_html_e('More post types coming soon...', 'wpvivid-backuprestore'); ?>
                </div>
            </div>

            <div id="wpvivid_export_page">
                <input class="button-primary wpvivid-button-export-archieve" type="submit" name="post" value="<?php esc_attr_e('Next Step', 'wpvivid-backuprestore'); ?>" />
            </div>
            <div class="postbox" id="wpvivid_export_task_progress" style="display: none; margin-top: 10px; margin-bottom: 0;">
                <div class="action-progress-bar" id="wpvivid_export_bar_percent">
                    <div class="action-progress-bar-percent" style="width:0; height:24px;"></div>
                </div>
                <div style="clear: both;"></div>
                <div style="margin-left:10px; float: left; width:100%;"><p id="wpvivid_export_current_doing"></p></div>
                <div style="clear: both;"></div>
            </div>
            <div class="postbox" id="wpvivid_export_summary" style="display: none; margin-top: 10px; margin-bottom: 0; padding: 10px;"></div>
        </div>

        <script>
            var export_task_id='';
            var retry_count=0;

            var current_export_type = 'post';
            function wpvivid_select_export_type(export_type){
                jQuery('.wpvivid-export-type-provider').removeClass('wpvivid-export-type-provider-active');
                jQuery('.wpvivid-export-type-'+export_type).addClass('wpvivid-export-type-provider-active');
                if(current_export_type !== export_type){
                    current_export_type = export_type;
                    var button_html = '<input class="button-primary wpvivid-button-export-archieve" type="submit" name="'+export_type+'" value="<?php esc_attr_e('Next Step', 'wpvivid-backuprestore'); ?>" />';
                    jQuery('#wpvivid_export_page').html(button_html);
                    jQuery('#wpvivid_export_summary').hide();
                }
            }

            function wpvivid_archieve_export_info(post_type, is_running){
                var ajax_data = {
                    'action':'wpvivid_export_post_step2',
                    'post_type': post_type
                };
                wpvivid_post_request(ajax_data, function(data) {
                    var jsonarray = jQuery.parseJSON(data);
                    if (jsonarray.result === 'success') {
                        jQuery('#wpvivid_export_page').html(jsonarray.html);
                        if(is_running){
                            jQuery('#wpvivid_export_custom').hide();
                        }
                    }
                    else if (jsonarray.result === 'failed') {
                        alert(jsonarray.error);
                    }
                }, function(XMLHttpRequest, textStatus, errorThrown) {
                    var error_message = wpvivid_output_ajaxerror('export the previously-exported settings', textStatus, errorThrown);
                    alert(error_message);
                });
            }

            function wpvivid_import_lock_unlock(action){
                var css_pointer_event = '';
                var css_opacity = '';
                if(action === 'lock'){
                    css_pointer_event = 'none';
                    css_opacity = '0.4';
                }
                else{
                    css_pointer_event = 'auto';
                    css_opacity = '1';
                }
                jQuery('.wpvivid-export-type-provider').css({'pointer-events': css_pointer_event, 'opacity': css_opacity});
                jQuery('#wpvivid_export_page .wpvivid-button-export-archieve').css({'pointer-events': css_pointer_event, 'opacity': css_opacity});
                jQuery('#wpvivid_export_page #wpvivid-post-query-submit').css({'pointer-events': css_pointer_event, 'opacity': css_opacity});
                jQuery('#wpvivid_export_page #wpvivid-post-research-submit').css({'pointer-events': css_pointer_event, 'opacity': css_opacity});
                jQuery('input:radio[name=contain]').css({'pointer-events': css_pointer_event, 'opacity': css_opacity});
                jQuery('#wpvivid_export_page #wpvivid_start_export').css({'pointer-events': css_pointer_event, 'opacity': css_opacity});
                jQuery('#wpvivid_tab_export').css({'pointer-events': css_pointer_event, 'opacity': css_opacity});
                jQuery('#wpvivid_tab_import').css({'pointer-events': css_pointer_event, 'opacity': css_opacity});
                jQuery('#wpvivid_empty_import_folder').css({'pointer-events': css_pointer_event, 'opacity': css_opacity});
                jQuery('#wpvivid_select_import_file_button').css({'pointer-events': css_pointer_event, 'opacity': css_opacity});
                jQuery('#wpvivid_upload_file_list').css({'pointer-events': css_pointer_event, 'opacity': css_opacity});
                jQuery('.export-list-import').css({'pointer-events': css_pointer_event, 'opacity': css_opacity});
                jQuery('#wpvivid_start_import').css({'pointer-events': css_pointer_event, 'opacity': css_opacity});
                jQuery('#wpvivid_rechoose_import_file').css({'pointer-events': css_pointer_event, 'opacity': css_opacity});
            }

            function wpvivid_export_lock_unlock(action){
                var css_pointer_event = '';
                var css_opacity = '';
                if(action === 'lock'){
                    css_pointer_event = 'none';
                    css_opacity = '0.4';
                }
                else{
                    css_pointer_event = 'auto';
                    css_opacity = '1';
                }
                jQuery('.wpvivid-export-type-provider').css({'pointer-events': css_pointer_event, 'opacity': css_opacity});
                jQuery('#wpvivid_export_page .wpvivid-button-export-archieve').css({'pointer-events': css_pointer_event, 'opacity': css_opacity});
                jQuery('#wpvivid_export_page #wpvivid-post-query-submit').css({'pointer-events': css_pointer_event, 'opacity': css_opacity});
                jQuery('#wpvivid_export_page #wpvivid-post-research-submit').css({'pointer-events': css_pointer_event, 'opacity': css_opacity});
                jQuery('input:radio[name=contain]').css({'pointer-events': css_pointer_event, 'opacity': css_opacity});
                jQuery('#wpvivid_export_page #wpvivid_start_export').css({'pointer-events': css_pointer_event, 'opacity': css_opacity});
            }

            jQuery('#wpvivid_export_page').on("click", ".wpvivid-button-export-archieve", function(){
                var post_type = jQuery(this).attr('name');
                wpvivid_archieve_export_info(post_type, false);
            });

            jQuery('#wpvivid_export_page').on("click", "#wpvivid-post-research-submit",function()
            {
                jQuery('#wpvivid_post_selector').show();
                jQuery('#wpvivid_post_list').hide();
            });
            jQuery('#wpvivid_export_page').on("click", "#wpvivid-post-query-submit",function()
            {
                var post_type = jQuery('#wpvivid-post-query-submit').attr('name');
                var cat=jQuery('select[name=cat]').val();
                var authors=jQuery('select[name=post_author]').val();
                var post_start_date=jQuery('select[name=post_start_date]').val();
                var post_end_date=jQuery('select[name=post_end_date]').val();
                var post_ids=jQuery('input[name=post-id]').val();
                var post_title=jQuery('input[name=post-title]').val();
                var ajax_data = {
                    'action':'wpvivid_get_post_list',
                    'post_type': post_type,
                    'cat':cat,
                    'authors':authors,
                    'post_start_date':post_start_date,
                    'post_end_date':post_end_date,
                    'post_ids':post_ids,
                    'post_title':post_title
                };
                wpvivid_post_request(ajax_data, function(data) {
                    var jsonarray = jQuery.parseJSON(data);
                    if (jsonarray.result === 'success') {
                        jQuery('#wpvivid_post_selector').hide();
                        jQuery('#wpvivid_bottom_step2').show();
                        jQuery('#wpvivid_post_list').show();
                        jQuery('#wpvivid_post_list').html(jsonarray.rows);
                    }
                    else if (jsonarray.result === 'failed') {
                        alert(jsonarray.error);
                    }
                }, function(XMLHttpRequest, textStatus, errorThrown) {
                    var error_message = wpvivid_output_ajaxerror('export the previously-exported settings', textStatus, errorThrown);
                    alert(error_message);
                });
            });

            jQuery('#wpvivid_export_page').on("click", 'input:radio[name=contain]',function() {
                if(jQuery(this).val()==='list') {
                    jQuery('#wpvivid_export_custom').show();
                }
                else {
                    jQuery('#wpvivid_export_custom').hide();
                }
            });

            jQuery('#wpvivid_export_page').on("keyup", '#wpvivid_set_post_comment', function(){
                var post_comment = jQuery('#wpvivid_set_post_comment').val();
                if(post_comment === ''){
                    post_comment = '*';
                    jQuery('#wpvivid_post_comment').html(post_comment);
                }
                else{
                    var reg = RegExp(/wpvivid/, 'i');
                    if (post_comment.match(reg)) {
                        jQuery('#wpvivid_set_post_comment').val('');
                        jQuery('#wpvivid_post_comment').html('*');
                        alert('<?php esc_html_e('You can not use word \'wpvivid\' to comment the post.', 'wpvivid-backuprestore'); ?>');
                    }
                    else{
                        jQuery('#wpvivid_post_comment').html(post_comment);
                    }
                }
            });

            function wpvivid_check_export_status(){
                var check_status = false;
                jQuery('input[name="post[]"]').each(function (i) {
                    var id=jQuery(this).val();
                    if(jQuery(this).prop('checked')) {
                        check_status = true;
                        return;
                    }
                });
                return check_status;
            }

            jQuery('#wpvivid_export_page').on("click", '#cb-select-all-1', function() {
                if(jQuery(this).prop('checked')) {
                    jQuery('#wpvivid_start_export').css({'pointer-events': 'auto', 'opacity': '1'});
                }
                else{
                    jQuery('#wpvivid_start_export').css({'pointer-events': 'none', 'opacity': '0.4'});
                }
            });

            jQuery('#wpvivid_export_page').on("click", '#cb-select-all-2', function() {
                if(jQuery(this).prop('checked')) {
                    jQuery('#wpvivid_start_export').css({'pointer-events': 'auto', 'opacity': '1'});
                }
                else{
                    jQuery('#wpvivid_start_export').css({'pointer-events': 'none', 'opacity': '0.4'});
                }
            });

            jQuery('#wpvivid_export_page').on("click", 'input[name="post[]"]', function() {
                var check_status = wpvivid_check_export_status();
                if(check_status){
                    jQuery('#wpvivid_start_export').css({'pointer-events': 'auto', 'opacity': '1'});
                }
                else{
                    jQuery('#wpvivid_start_export').css({'pointer-events': 'none', 'opacity': '0.4'});
                }
            });

            jQuery('#wpvivid_export_page').on("click", '#wpvivid_start_export', function(){
                wpvivid_clear_notice('wpvivid_export_notice');
                jQuery('#wpvivid_export_summary').hide();
                var post_type = jQuery('#wpvivid_start_export').attr('name');

                var select_type='all';
                jQuery('input:radio[name=contain]').each(function() {
                    if(jQuery(this).prop('checked')) {
                        select_type=jQuery(this).val();
                    }
                });

                var has_item = false;
                var post_ids = {};
                jQuery('input[name="post[]"]').each(function (i) {
                    var id=jQuery(this).val();
                    if(jQuery(this).prop('checked')) {
                        post_ids[id]=1;
                        has_item = true;
                    }
                    else {
                        post_ids[id]=0;
                    }
                });

                if(select_type === 'list' && !has_item){
                    alert('<?php esc_html_e('Please select at least one item.', 'wpvivid-backuprestore'); ?>');
                }
                else{
                    var post_ids_json = {
                        'post_ids': post_ids
                    };

                    jQuery('#wpvivid_export_custom').hide();

                    var export_data = wpvivid_ajax_data_transfer('export');
                    export_data = JSON.parse(export_data);
                    jQuery.extend(export_data, post_ids_json);
                    export_data = JSON.stringify(export_data);

                    var ajax_data = {
                        'action': 'wpvivid_prepare_export_post',
                        'post_type': post_type,
                        'export_data': export_data
                    };
                    wpvivid_export_lock_unlock('lock');
                    wpvivid_post_request(ajax_data, function(data)
                    {
                        var jsonarray = jQuery.parseJSON(data);
                        if (jsonarray.result === 'success')
                        {
                            export_task_id=jsonarray.task_id;

                            var ajax_data = {
                                'action':'wpvivid_export_now',
                                'task_id':export_task_id
                            };

                            wpvivid_export_progpress();

                            wpvivid_post_request(ajax_data, function(data) {
                            },function(XMLHttpRequest, textStatus, errorThrown) {
                            });
                        }
                        else if (jsonarray.result === 'failed') {
                            wpvivid_export_lock_unlock('unlock');
                            alert(jsonarray.error);
                        }
                    }, function(XMLHttpRequest, textStatus, errorThrown) {
                        wpvivid_export_lock_unlock('unlock');
                        var error_message = wpvivid_output_ajaxerror('export the previously-exported settings', textStatus, errorThrown);
                        alert(error_message);
                    });
                }
            });

            jQuery('#wpvivid_export_page').on("click",'.first-page',function() {
                wpvivid_change_page('first');
            });

            jQuery('#wpvivid_export_page').on("click",'.prev-page',function() {
                var page=parseInt(jQuery(this).attr('value'));
                wpvivid_change_page(page-1);
            });

            jQuery('#wpvivid_export_page').on("click",'.next-page',function() {
                var page=parseInt(jQuery(this).attr('value'));
                wpvivid_change_page(page+1);
            });

            jQuery('#wpvivid_export_page').on("click",'.last-page',function() {
                wpvivid_change_page('last');
            });

            jQuery('#wpvivid_export_page').on("keypress", '.current-page', function(){
                if(event.keyCode === 13){
                    var page = jQuery(this).val();
                    wpvivid_change_page(page);
                }
            });

            function wpvivid_change_page(page) {
                var post_type='post';
                jQuery('input:radio[name=post_type]').each(function() {
                    if(jQuery(this).prop('checked'))
                    {
                        post_type=jQuery(this).val();
                    }
                });

                var post_ids = {};

                jQuery('input[name="post[]"]').each(function (i) {
                    var id=jQuery(this).val();
                    if(jQuery(this).prop('checked'))
                    {
                        post_ids[id]=1;
                    }
                    else
                    {
                        post_ids[id]=0;
                    }
                });

                var ajax_data = {
                    'action':'wpvivid_get_post_list_page',
                    'post_type': post_type,
                    'page': page,
                    'post_ids':post_ids
                };

                wpvivid_post_request(ajax_data, function(data) {
                    var jsonarray = jQuery.parseJSON(data);
                    if (jsonarray.result === 'success') {
                        jQuery('#wpvivid_post_list').html(jsonarray.rows);
                    }
                    else if (jsonarray.result === 'failed') {
                        alert(jsonarray.error);
                    }
                }, function(XMLHttpRequest, textStatus, errorThrown) {
                    var error_message = wpvivid_output_ajaxerror('export the previously-exported settings', textStatus, errorThrown);
                    alert(error_message);
                });
            }

            function wpvivid_export_progpress() {
                var ajax_data = {
                    'action': 'wpvivid_export_list_tasks',
                    'task_id': export_task_id
                };

                jQuery('#wpvivid_export_task_progress').show();

                wpvivid_post_request(ajax_data, function(data)
                {
                    var jsonarray = jQuery.parseJSON(data);
                    if (jsonarray.result === 'success')
                    {
                        retry_count=0;
                        export_task_id=jsonarray.task_id;
                        if(jsonarray.show)
                        {
                            jQuery('#wpvivid_export_task_progress').show();
                            jQuery('#wpvivid_export_summary').hide();
                            jQuery('#wpvivid_export_bar_percent').html(jsonarray.percent);
                            jQuery('#wpvivid_export_current_doing').html(jsonarray.doing);
                        }
                        else
                        {
                            jQuery('#wpvivid_export_task_progress').hide();
                        }

                        if(jsonarray.completed)
                        {
                            wpvivid_export_lock_unlock('unlock');
                            //jQuery('#wpvivid_export_notice').show();
                            //jQuery('#wpvivid_export_notice').append(jsonarray.doing);
                            jQuery('#wpvivid_export_summary').show();
                            jQuery('#wpvivid_export_summary').html(jsonarray.doing);
                            jQuery('html, body').animate({scrollTop: jQuery("#wpvivid_export_notice").offset().top}, 'slow');
                            wpvivid_download_export(jsonarray.file_name, jsonarray.file_size);
                        }

                        if(jsonarray.continue)
                        {
                            wpvivid_export_lock_unlock('lock');
                            setTimeout(function ()
                            {
                                wpvivid_export_progpress();
                            }, 3000);
                        }

                        if(jsonarray.error){
                            wpvivid_export_lock_unlock('unlock');
                            jQuery('#wpvivid_export_notice').show();
                            jQuery('#wpvivid_export_notice').append(jsonarray.doing);
                            jQuery('html, body').animate({scrollTop: jQuery("#wpvivid_export_notice").offset().top}, 'slow');
                        }
                    }
                    else
                    {
                        alert(jsonarray.error);
                    }
                }, function(XMLHttpRequest, textStatus, errorThrown)
                {
                    retry_count++;
                    if(retry_count<3)
                    {
                        setTimeout(function () {
                            wpvivid_export_progpress();
                        }, 3000);
                    }
                });
            }

            function wpvivid_download_export(file_name, file_size){
                location.href =ajaxurl+'?_wpnonce='+wpvivid_ajax_object.ajax_nonce+'&action=wpvivid_download_export_backup&file_name='+file_name+'&file_size='+file_size;
            }

            jQuery(document).ready(function (){
                <?php
                $task_id = false;
                $post_type = false;
                $tasks=WPvivid_Exporter_taskmanager::get_tasks();
                foreach ($tasks as $task){
                    $task_id = $task['id'];
                    $post_type = $task['options']['backup_options']['post_type'];
                    break;
                }
                ?>
                var task_id = '<?php echo esc_attr($task_id); ?>';
                if(task_id != false){
                    export_task_id = task_id;
                    wpvivid_export_lock_unlock('lock');
                    wpvivid_export_progpress();
                }
            });
        </script>
        <?php
    }

    public function export_post_step2()
    {
        check_ajax_referer( 'wpvivid_ajax', 'nonce' );
        $check=current_user_can('manage_options');
        $check=apply_filters('wpvivid_ajax_check_security',$check);
        if(!$check)
        {
            die();
        }
        if(isset($_POST['post_type']))
        {
            global $wpdb;
            $post_type = sanitize_text_field($_POST['post_type']);
            $descript_type = $post_type === 'post' ? 'posts' : 'pages';
            $btn_text = $post_type === 'post' ? __('Show Posts', 'wpvivid-backuprestore') : __('Show Pages', 'wpvivid-backuprestore');

            ob_start();
            ?>
            <div style="width:100%; border:1px solid #f1f1f1; float:left; box-sizing: border-box;margin-bottom:10px;">
                <div style="box-sizing: border-box; margin: 1px; background-color: #f1f1f1;"><h2><?php esc_html_e('Choose what to export', 'wpvivid-backuprestore'); ?></h2></div>
            </div>
            <div style="clear: both;"></div>
            <div style="width:100%; border:1px solid #f1f1f1; float:left; padding:10px 10px 0 10px;margin-bottom:10px; box-sizing: border-box;">
                <fieldset>
                    <legend class="screen-reader-text"><span>input type="radio"</span></legend>
                    <div class="wpvivid-element-space-bottom wpvivid-element-space-right" style="float: left;">
                        <label>
                            <input type="radio" option="export" name="contain" value="list" checked/><?php esc_html_e('Filter Posts/Pages', 'wpvivid-backuprestore'); ?>
                        </label>
                    </div>
                    <div style="clear: both;"></div>
                </fieldset>

                <div id="wpvivid_export_custom" style="margin-bottom: 10px;">
                    <table id="wpvivid_post_selector" class="wp-list-table widefat plugins" style="width:100%; border:1px solid #f1f1f1;">
                        <tbody>
                        <?php
                        if($post_type !== 'page') {
                            ?>
                            <tr>
                                <td class="plugin-title column-primary">
                                    <div class="wpvivid-storage-form regular-text">
                                        <?php
                                        wp_dropdown_categories(
                                            array(
                                                'class' => 'regular-text',
                                                'show_option_all' => __('All Categories', 'wpvivid-backuprestore')
                                            )
                                        );
                                        ?>
                                    </div>
                                </td>
                                <td class="column-description desc">
                                    <div class="wpvivid-storage-form-desc">
                                        <i>
                                            <?php
                                            echo esc_html(sprintf('Export %s of all categories or a specific category.', $descript_type));
                                            ?>
                                        </i>
                                    </div>
                                </td>
                            </tr>
                            <?php
                        }
                        ?>
                        <tr>
                            <td class="plugin-title column-primary">
                                <div class="wpvivid-storage-form regular-text">
                                    <?php
                                    $authors = $wpdb->get_col( "SELECT DISTINCT post_author FROM {$wpdb->posts} WHERE post_type = '$post_type'" );
                                    wp_dropdown_users(
                                        array(
                                            'class'           => 'regular-text',
                                            'include'         => $authors,
                                            'name'            => 'post_author',
                                            'multi'           => true,
                                            'show_option_all' => __( 'All Authors', 'wpvivid-backuprestore' ),
                                            'show'            => 'display_name_with_login',
                                        )
                                    );
                                    ?>
                                </div>
                            </td>
                            <td class="column-description desc">
                                <div class="wpvivid-storage-form-desc">
                                    <i>
                                        <?php
                                        echo esc_html(sprintf('Export %s of all authors or a specific author.', $descript_type));
                                        ?>
                                    </i>
                                </div>
                            </td>
                        </tr>

                        <tr>
                            <td class="plugin-title column-primary">
                                <div class="wpvivid-storage-form regular-text">
                                    <label for="post-start-date" class="label-responsive" style="display: block;"></label>
                                    <select class="regular-text" name="post_start_date" id="post-start-date">
                                        <option value="0"><?php esc_html_e( '&mdash; Select &mdash;', 'wpvivid-backuprestore' ); ?></option>
                                        <?php $this->export_date_options($post_type); ?>
                                    </select>
                                </div>
                            </td>
                            <td class="column-description desc">
                                <div class="wpvivid-storage-form-desc">
                                    <i>
                                        <?php
                                        echo esc_html(sprintf('Export %s published after this date.', $descript_type));
                                        ?>
                                    </i>
                                </div>
                            </td>
                        </tr>

                        <tr>
                            <td class="plugin-title column-primary">
                                <div class="wpvivid-storage-form regular-text">
                                    <label for="post-end-date" class="label-responsive" style="display: block;"></label>
                                    <select class="regular-text" name="post_end_date" id="post-end-date">
                                        <option value="0"><?php esc_html_e( '&mdash; Select &mdash;', 'wpvivid-backuprestore' ); ?></option>
                                        <?php $this->export_date_options($post_type); ?>
                                    </select>
                                </div>
                            </td>
                            <td class="column-description desc">
                                <div class="wpvivid-storage-form-desc">
                                    <i>
                                        <?php
                                        echo esc_html(sprintf('Export %s published before this date.', $descript_type));
                                        ?>
                                    </i>
                                </div>
                            </td>
                        </tr>

                        <tr style="display: none;">
                            <td class="plugin-title column-primary">
                                <div class="wpvivid-storage-form">
                                    <input type="text" class="regular-text" id="post-search-id-input" name="post-id" autocomplete="off" value=""/>
                                </div>
                            </td>
                            <td class="column-description desc">
                                <div class="wpvivid-storage-form-desc">
                                    <i>Enter a <?php echo esc_html($post_type); ?> ID.(optional)</i>
                                </div>
                            </td>
                        </tr>

                        <tr style="display: none;">
                            <td class="plugin-title column-primary">
                                <div class="wpvivid-storage-form">
                                    <input type="text" class="regular-text" id="post-search-title-input" name="post-title" autocomplete="off" value=""/>
                                </div>
                            </td>
                            <td class="column-description desc">
                                <div class="wpvivid-storage-form-desc">
                                    <i>Enter a <?php echo esc_html($post_type); ?> title.(optional)</i>
                                </div>
                            </td>
                        </tr>

                        <tr>
                            <td class="plugin-title column-primary">
                                <div class="wpvivid-storage-form">
                                    <input class="button-primary" id="wpvivid-post-query-submit" type="submit" name="<?php echo esc_attr($post_type); ?>" value="<?php echo esc_attr($btn_text); ?>" />
                                </div>
                            </td>
                            <td class="column-description desc">
                                <div class="wpvivid-storage-form-desc">
                                    <i>
                                        <?php
                                        echo esc_html(sprintf('Search for %s according to the above rules.', $post_type));
                                        ?>
                                    </i>
                                </div>
                            </td>
                        </tr>
                        </tbody>
                    </table>
                    <div id="wpvivid_post_list"></div>
                </div>
            </div>

            <div style="width:100%; border:1px solid #f1f1f1; float:left; box-sizing: border-box;margin-bottom:10px;">
                <div style="box-sizing: border-box; margin: 1px; background-color: #f1f1f1;"><h2><?php esc_html_e('Comment the export (optional)', 'wpvivid-backuprestore'); ?></h2></div>
            </div>
            <div style="clear: both;"></div>
            <div style="width:100%; border:1px solid #f1f1f1; float:left; padding:10px 10px 0 10px;margin-bottom:10px; box-sizing: border-box;">
                <div>
                    <div class="wpvivid-element-space-bottom wpvivid-text-space-right" style="float: left; padding-top: 6px;"><?php esc_html_e('Comment the export: ', 'wpvivid-backuprestore'); ?></div>
                    <div class="wpvivid-element-space-bottom wpvivid-text-space-right" style="float: left;">
                        <input type="text" option="export" name="post_comment" id="wpvivid_set_post_comment" onkeyup="value=value.replace(/[^a-zA-Z0-9]/g,'')" onpaste="value=value.replace(/[^\a-\z\A-\Z0-9]/g,'')" />
                    </div>
                    <div class="wpvivid-element-space-bottom wpvivid-text-space-right" style="float: left; padding-top: 6px;"><?php esc_html_e('Only letters (except for wpvivid) and numbers are allowed.', 'wpvivid-backuprestore'); ?></div>
                    <div style="clear: both;"></div>
                </div>
                <div>
                    <div class="wpvivid-element-space-bottom wpvivid-text-space-right" style="float: left;"><?php esc_html_e('Sample:', 'wpvivid-backuprestore'); ?></div>
                    <div class="wpvivid-element-space-bottom" style="float: left;">
                        <div class="wpvivid-element-space-bottom" style="display: inline;" id="wpvivid_post_comment">*</div><div class="wpvivid-element-space-bottom" style="display: inline;">_wpvivid-5dbf8d6a5f133_2019-11-08-03-15_export_<?php echo esc_html($post_type); ?>.zip</div>
                    </div>
                    <div style="clear: both;"></div>
                </div>
            </div>

            <div>
                <input class="button-primary" id="wpvivid_start_export" type="submit" name="<?php echo esc_attr($post_type); ?>" value="<?php esc_attr_e('Export and Download', 'wpvivid-backuprestore'); ?>" style="pointer-events: none; opacity: 0.4;">
            </div>
            <?php

            $html = ob_get_clean();
            $ret['result']='success';
            $ret['html']=$html;
        }
        else
        {
            $ret['result']='failed';
            $ret['error']='not set post type';
        }
        echo wp_json_encode($ret);
        die();
    }

    public function export_post_step3()
    {
        check_ajax_referer( 'wpvivid_ajax', 'nonce' );
        $check=current_user_can('manage_options');
        $check=apply_filters('wpvivid_ajax_check_security',$check);
        if(!$check)
        {
            die();
        }
        $post_type=sanitize_text_field($_POST['post_type']);
        $post_all=sanitize_text_field($_POST['all']);
        if(isset($post_type)&&isset($post_all))
        {
            $old_post_ids=array();
            if(isset($_POST['post_ids']))
            {
                $old_post_ids=$_POST['post_ids'];
                $old_post_ids = array_map( 'sanitize_key', $old_post_ids );
                $old_post_ids=(int)$old_post_ids;
            }

            $list_cache=get_option('wpvivid_list_cache',array());

            foreach ($old_post_ids as $id=>$checked)
            {
                if(isset($list_cache[$id]))
                {
                    $list_cache[$id]['checked']=$checked;
                }
            }
            WPvivid_Setting::update_option('wpvivid_list_cache',$list_cache);

            $post_count=0;

            if($post_all=='all')
            {
                global $wpdb;

                $where      = $wpdb->prepare( "post_type =%s", $post_type);
                $posts_ids = $wpdb->get_col( "SELECT ID FROM {$wpdb->posts} WHERE $where" );
                $post_count=sizeof($posts_ids);
            }
            else
            {
                foreach ($list_cache as $id=>$item)
                {
                    if($item['checked'])
                        $post_count++;
                }
            }

            ob_start();
            ?>
            <h2>Export post type:<strong><?php echo esc_html($post_type)?></strong></h2>
            <p>
                Selected post(s):<?php echo esc_html($post_count)?>
            </p>
            <p class="submit">
                <input type="button" class="button button-primary wpvivid-export-step3-prev" value="Prev step">
                <input type="button" class="button button-primary" id="wpvivid_start_export" value="Start Export">
            </p>
            <?php

            $html = ob_get_clean();
            $ret['result']='success';
            $ret['html']=$html;
        }
        else
        {
            $ret['result']='failed';
            $ret['error']='not set post type';
        }
        echo wp_json_encode($ret);
        die();
    }

    public function my_admin_custom_styles()
    {
        echo  '<style type="text/css">    
        .column-file_name { width:25% }
        .column-export_type { width:8% }
        .column-posts_count { width:8% }
        .column-media_size { width:8% }
        .column-import { width:8% }
    </style>';
    }

    public function get_list()
    {
        check_ajax_referer( 'wpvivid_ajax', 'nonce' );
        $check=current_user_can('manage_options');
        $check=apply_filters('wpvivid_ajax_check_security',$check);
        if(!$check)
        {
            die();
        }

        if(!isset($_POST['post_type'])&&!isset($_POST['cat'])&&!isset($_POST['authors'])&&!isset($_POST['post_start_date'])&&!isset($_POST['post_end_date']))
        {
            die();
        }

        if(isset($_POST['post_ids'])&&!empty($_POST['post_ids']))
        {
            $select_post_id=$_POST['post_ids'];
            $select_post_id = array_map( 'sanitize_key', $select_post_id );
            $select_post_id=(int)$select_post_id;
        }
        else
        {
            $select_post_id=0;
        }

        if(isset($_POST['post_title'])&&!empty($_POST['post_title']))
        {
            $post_title=sanitize_text_field($_POST['post_title']);
        }
        else
        {
            $post_title='';
        }
        //

        $post_type=sanitize_text_field($_POST['post_type']);
        if(isset($_POST['cat'])) {
            $cat = (int)sanitize_key($_POST['cat']);
        }
        $author=(int)sanitize_key($_POST['authors']);
        $post_start_date=sanitize_text_field($_POST['post_start_date']);
        $post_end_date=sanitize_text_field($_POST['post_end_date']);


        global $wpdb;

        $where      = $wpdb->prepare( "post_type =%s", $post_type);
        $join = '';
        if(isset($_POST['cat'])) {
            if ($term = term_exists($cat, 'category')) {
                $join = "INNER JOIN {$wpdb->term_relationships} ON ({$wpdb->posts}.ID = {$wpdb->term_relationships}.object_id)";
                $where .= $wpdb->prepare(" AND {$wpdb->term_relationships}.term_taxonomy_id = %d", $term['term_taxonomy_id']);
            }
        }
        if ( $author )
        {
            $where .= $wpdb->prepare( " AND {$wpdb->posts}.post_author = %d", $author );
        }
        if ( $post_start_date )
        {
            $where .= $wpdb->prepare( " AND {$wpdb->posts}.post_date >= %s", gmdate( 'Y-m-d', strtotime( $post_start_date ) ) );
        }
        if ( $post_end_date )
        {
            $where .= $wpdb->prepare( " AND {$wpdb->posts}.post_date < %s", gmdate( 'Y-m-d', strtotime( '+1 month', strtotime( $post_end_date ) ) ) );
        }
        if($select_post_id)
        {
            $where .= $wpdb->prepare( " AND {$wpdb->posts}.ID = %d", $select_post_id );
        }
        if($post_title)
        {
            $where .= $wpdb->prepare( " AND {$wpdb->posts}.post_title LIKE %s", '%' . $wpdb->esc_like($post_title) . '%' );
        }

        $posts_ids = $wpdb->get_col( "SELECT ID FROM {$wpdb->posts} $join WHERE $where" );

        asort($posts_ids);

        $list_cache=array();
        foreach ($posts_ids as $id)
        {
            $post_id['id']=$id;
            $post_id['checked']=0;
            $list_cache[$id]=$post_id;
        }
        WPvivid_Setting::update_option('wpvivid_list_cache',$list_cache);
        $page=1;

        $arg['screen']=$post_type;
        $myListTable = new WPvivid_Post_List($arg);
        $myListTable->set_post_ids($list_cache,$page);
        $myListTable->prepare_items();
        ob_start();
        $myListTable->display();
        $rows = ob_get_clean();
        $ret['result']='success';
        $ret['rows']=$rows;
        echo wp_json_encode($ret);

        die();
    }

    public function get_export_list()
    {
        check_ajax_referer( 'wpvivid_ajax', 'nonce' );
        $check=current_user_can('manage_options');
        $check=apply_filters('wpvivid_ajax_check_security',$check);
        if(!$check)
        {
            die();
        }
        $list = get_option('wpvivid_export_list',array());
        $display_list=new WPvivid_Export_List();
        $display_list->set_parent('wpvivid_import_list');
        $display_list->set_list($list);
        $display_list->prepare_items();
        ob_start();
        $display_list->display();
        $html = ob_get_clean();
        $ret['result']='success';
        $ret['html']=$html;
        echo wp_json_encode($ret);

        die();
    }

    public function get_list_page()
    {
        check_ajax_referer( 'wpvivid_ajax', 'nonce' );
        $check=current_user_can('manage_options');
        $check=apply_filters('wpvivid_ajax_check_security',$check);
        if(!$check)
        {
            die();
        }

        if(!isset($_POST['post_type'])&&!isset($_POST['page']))
        {
            die();
        }

        $list_cache=get_option('wpvivid_list_cache',array());

        WPvivid_Setting::update_option('wpvivid_list_cache',$list_cache);

        $page=sanitize_key($_POST['page']);

        $post_type=sanitize_text_field($_POST['post_type']);
        $arg['screen']=$post_type;

        $myListTable = new WPvivid_Post_List($arg);
        $myListTable->set_post_ids($list_cache,$page);
        $myListTable->prepare_items();
        ob_start();
        $myListTable->display();
        $rows = ob_get_clean();

        $ret['result']='success';
        $ret['rows']=$rows;
        echo wp_json_encode($ret);
        die();
    }

    public function export_date_options($post_type = 'post')
    {
        global $wpdb, $wp_locale;

        $months = $wpdb->get_results(
            $wpdb->prepare(
                "
		SELECT DISTINCT YEAR( post_date ) AS year, MONTH( post_date ) AS month
		FROM $wpdb->posts
		WHERE post_type = %s AND post_status != 'auto-draft'
		ORDER BY post_date DESC
	",
                $post_type
            )
        );

        $month_count = count( $months );
        if ( ! $month_count || ( 1 == $month_count && 0 == $months[0]->month ) ) {
            return;
        }

        foreach ( $months as $date ) {
            if ( 0 == $date->year ) {
                continue;
            }

            $month = zeroise( $date->month, 2 );
            echo '<option value="' . esc_attr($date->year) . '-' . esc_attr($month) . '">' . esc_html($wp_locale->get_month( $month ) . ' ' . $date->year) . '</option>';
        }
    }

    public function prepare_export_post()
    {
        check_ajax_referer( 'wpvivid_ajax', 'nonce' );
        $check=current_user_can('manage_options');
        $check=apply_filters('wpvivid_ajax_check_security',$check);
        if(!$check)
        {
            die();
        }
        if(isset($_POST['post_type'])&&isset($_POST['export_data']))
        {
            $post_type   = sanitize_text_field($_POST['post_type']);
            $json_export = sanitize_text_field($_POST['export_data']);
            $json_export = stripslashes($json_export);
            $export_data = json_decode($json_export, true);

            $post_ids=array();
            $posts_ids=array();
            if(isset($export_data['post_ids']) && !empty($export_data['post_ids']))
            {
                $post_ids=$export_data['post_ids'];
            }
            foreach ($post_ids as $id=>$checked)
            {
                if($checked)
                {
                    $posts_ids[]=$id;
                }
            }

            if(empty($posts_ids))
            {
                $ret['result']='failed';
                $ret['error']=__('Empty post id', 'wpvivid-backuprestore');
                echo wp_json_encode($ret);
                die();
            }
            if(WPvivid_Exporter_taskmanager::is_tasks_running())
            {
                $ret['result']='failed';
                $ret['error']=__('A task is already running. Please wait until the running task is complete, and try again.', 'wpvivid-backuprestore');
                echo wp_json_encode($ret);
                die();
            }

            $export_task=new WPvivid_Exporter_task();

            $options['post_ids']=$posts_ids;
            $options['post_type']=$post_type;
            $options['post_comment']=$export_data['post_comment'];

            $ret=$export_task->new_backup_task($options);
            echo wp_json_encode($ret);
        }
        die();
    }

    public function export_now()
    {
        check_ajax_referer( 'wpvivid_ajax', 'nonce' );
        $check=current_user_can('manage_options');
        $check=apply_filters('wpvivid_ajax_check_security',$check);
        if(!$check)
        {
            die();
        }
        try
        {
            if (!isset($_POST['task_id']) || empty($_POST['task_id']) || !is_string($_POST['task_id']))
            {
                $ret['result'] = 'failed';
                $ret['error'] = __('Error occurred while parsing the request data. Please try to run export task again.', 'wpvivid-backuprestore');
                echo wp_json_encode($ret);
                die();
            }

            $task_id = sanitize_key($_POST['task_id']);

            if(WPvivid_Exporter_taskmanager::is_tasks_running())
            {
                $ret['result'] = 'failed';
                $ret['error'] = __('A task is already running. Please wait until the running task is complete, and try again.', 'wpvivid-backuprestore');
                echo wp_json_encode($ret);
                die();
            }

            $this->export_post($task_id);
        }
        catch (Exception $error)
        {
            $message = 'An exception has occurred. class: '.get_class($error).';msg: '.$error->getMessage().';code: '.$error->getCode().';line: '.$error->getLine().';in_file: '.$error->getFile().';';
            error_log($message);
            echo wp_json_encode(array('result'=>'failed','error'=>$message));
            die();
        }
        die();
    }

    public function export_post($task_id)
    {
        $this->end_shutdown_function = false;
        register_shutdown_function(array($this,'deal_shutdown_error'),$task_id);
        @ignore_user_abort(true);

        WPvivid_Exporter_taskmanager::update_backup_task_status($task_id,true,'running');

        global $wpvivid_plugin;

        $wpvivid_plugin->wpvivid_log->OpenLogFile(WPvivid_Exporter_taskmanager::get_task_options($task_id,'log_file_name'));
        $wpvivid_plugin->wpvivid_log->WriteLog('Start export posts.','notice');
        $wpvivid_plugin->wpvivid_log->WriteLogHander();
        $this->flush($task_id);

        $export=new WPvivid_Exporter();

        @set_time_limit(900);
        try
        {
            $ret = $export->export($task_id);
            if($ret['result']=='success')
            {
                do_action('wpvivid_handle_export_success', $task_id, true);
            }
            else
            {
                $wpvivid_plugin->wpvivid_log->WriteLog($ret['error'],'error');
                WPvivid_Exporter_taskmanager::update_backup_task_status($task_id, false, 'error', false, false, $ret['error']);
                do_action('wpvivid_handle_export_failed', $task_id, true);
            }

        }
        catch (Exception $error)
        {
            $message = 'An error has occurred. class:'.get_class($error).';msg:'.$error->getMessage().';code:'.$error->getCode().';line:'.$error->getLine().';in_file:'.$error->getFile().';';
            error_log($message);
            WPvivid_Exporter_taskmanager::update_backup_task_status($task_id,false,'error',false,false,$message);
            $wpvivid_plugin->wpvivid_log->WriteLog($message,'error');
            $this->end_shutdown_function=true;
            die();
        }

        echo wp_json_encode($ret);
        $this->end_shutdown_function=true;
        die();
    }

    public function deal_shutdown_error($task_id)
    {
        if($this->end_shutdown_function===false)
        {
            global $wpvivid_plugin;

            $last_error = error_get_last();
            if (!empty($last_error) && !in_array($last_error['type'], array(E_NOTICE,E_WARNING,E_USER_NOTICE,E_USER_WARNING,E_DEPRECATED), true))
            {
                $error = $last_error;
            } else {
                $error = false;
            }
            if (WPvivid_Exporter_taskmanager::get_task($task_id) !== false)
            {
                if ($wpvivid_plugin->wpvivid_log->log_file_handle == false)
                {
                    $wpvivid_plugin->wpvivid_log->OpenLogFile(WPvivid_Exporter_taskmanager::get_task_options($task_id, 'log_file_name'));
                }

                $status = WPvivid_Exporter_taskmanager::get_backup_task_status($task_id);

                $message='in shutdown';

                if ($error !== false)
                {
                    $message= 'type: '. $error['type'] . ', ' . $error['message'] . ' file:' . $error['file'] . ' line:' . $error['line'];
                }
                WPvivid_Exporter_taskmanager::update_backup_task_status($task_id, false, 'error', false, $status['resume_count'], $message);
                if ($wpvivid_plugin->wpvivid_log)
                    $wpvivid_plugin->wpvivid_log->WriteLog($message, 'error');
            }
            die();
        }
    }

    public function handle_export_success($task_id)
    {
        global $wpvivid_plugin;
        WPvivid_Exporter_taskmanager::update_backup_task_status($task_id,false,'completed');

        $wpvivid_plugin->wpvivid_log->WriteLog('Finished to export post','notice');
    }

    public function handle_export_failed($task_id)
    {
    }

    public function list_tasks()
    {
        check_ajax_referer( 'wpvivid_ajax', 'nonce' );
        $check=current_user_can('manage_options');
        $check=apply_filters('wpvivid_ajax_check_security',$check);
        if(!$check)
        {
            die();
        }

        $ret['result']='success';
        $ret['show']=false;
        $tasks=WPvivid_Exporter_taskmanager::get_tasks();
        foreach ($tasks as $task)
        {
            $this->task_monitor($task['id']);
            $task=WPvivid_Exporter_taskmanager::get_task($task['id']);
            $status=WPvivid_Exporter_taskmanager::get_backup_task_status($task['id']);

            $ret['show']=true;
            $ret['completed']=false;
            $ret['error']=false;
            if($status['str']=='running'||$status['str']=='no_responds'||$status['str']=='ready')
            {
                $ret['continue']=1;
            }
            else
            {
                $ret['continue']=0;
                $ret['show']=false;
            }

            $progress=WPvivid_Exporter_taskmanager::get_backup_tasks_progress($task['id']);
            $ret['percent']='<div class="action-progress-bar-percent"  style="height:24px;width:'.(int)$progress['progress'].'%;"></div>';
            $ret['doing']=$task['data']['doing']='export';
            if($status['str']=='ready')
            {
                $ret['doing']=__('Ready to export. Progress: 0%, running time: 0second.','wpvivid-backuprestore');
            }
            else if($status['str']=='running')
            {
                $ret['doing']= ' '.__('Progress: ', 'wpvivid-backuprestore') . $progress['descript'] . ', '.__('running time: ', 'wpvivid-backuprestore') . $progress['running_time'];
            }
            else if($status['str']=='wait_resume')
            {
                $ret['doing']='Task '.$task['id'].' timed out, the export task will retry in '.$task['data']['next_resume_time'].' seconds, retry times: '.$task['status']['resume_count'].'.';
            }
            else if($status['str']=='no_responds')
            {
                $ret['doing']=__('The export task is not responding.','wpvivid-backuprestore');
            }
            else if($status['str']=='completed')
            {
                $file_name = $task['data']['export']['export_info']['file_name'];
                $file_size = $task['data']['export']['export_info']['size'];
                if($task['options']['backup_options']['post_type'] === 'post'){
                    $post_type = 'posts';
                }
                else{
                    $post_type = 'pages';
                }
                $msg = '<div style="margin-bottom: 10px;">The export task is completed and the automatic download starts. If the automatic download didn\'t run, please click <a style="cursor:pointer;" onclick="wpvivid_download_export(\''.$file_name.'\', \''.$file_size.'\');">here</a> to download.</div>';
                $msg .= '<div style="margin-bottom: 10px;">The count of exported '.$post_type.': '.$task['data']['export']['export_info']['post_count'].'.</div>';
                $msg .= '<div style="margin-bottom: 10px;">File name: '.$file_name.'.</div>';
                $msg .= '<div>File size: '.size_format($file_size, 2).'.</div>';

                $ret['completed']=true;
                $ret['file_name'] = $file_name;
                $ret['file_size'] = $file_size;
                $ret['doing']=$msg;
            }
            else if($status['str']=='error')
            {
                $ret['doing']='Export error: '.$task['status']['error'];
                $ret['doing']='<div class="notice notice-error is-dismissible inline"><p>'.__('Export error:', 'wpvivid-backuprestore').' '.$task['status']['error'].'</p></div>';
                $ret['error']=true;
            }

            if($ret['completed']||$ret['error'])
            {
                WPvivid_Exporter_taskmanager::delete_task($task['id']);
            }
        }
        echo wp_json_encode($ret);
        die();
    }

    public function task_monitor($task_id)
    {
        global $wpvivid_plugin;

        if(WPvivid_Exporter_taskmanager::get_task($task_id)!==false)
        {
            if($wpvivid_plugin->wpvivid_log->log_file_handle==false)
            {
                $wpvivid_plugin->wpvivid_log->OpenLogFile(WPvivid_Exporter_taskmanager::get_task_options($task_id,'log_file_name'));
            }

            $status=WPvivid_Exporter_taskmanager::get_backup_task_status($task_id);

            if($status['str']=='running'||$status['str']=='error'||$status['str']=='no_responds')
            {
                $limit=900;
                $time_spend=time()-$status['timeout'];

                if($time_spend>=$limit)
                {
                    //time out
                    $message=__('Task time out.', 'wpvivid-backuprestore');
                    WPvivid_Exporter_taskmanager::update_backup_task_status($task_id,false,'error',false,$status['resume_count'],$message);
                    if($wpvivid_plugin->wpvivid_log)
                        $wpvivid_plugin->wpvivid_log->WriteLog($message,'error');
                    $wpvivid_plugin->wpvivid_log->CloseFile();
                    WPvivid_error_log::create_error_log($wpvivid_plugin->wpvivid_log->log_file);
                }
                else {
                    $time_spend=time()-$status['run_time'];
                    if($time_spend>180)
                    {
                        $wpvivid_plugin->wpvivid_log->WriteLog('Not responding for a long time.','notice');
                        WPvivid_Exporter_taskmanager::update_backup_task_status($task_id,false,'no_responds',false,$status['resume_count']);
                    }
                }
            }
        }
    }

    public function delete_export_list()
    {
        check_ajax_referer( 'wpvivid_ajax', 'nonce' );
        $check=current_user_can('manage_options');
        $check=apply_filters('wpvivid_ajax_check_security',$check);
        if(!$check)
        {
            die();
        }

        if(isset($_POST['export_id']))
        {
            $id=sanitize_key($_POST['export_id']);
            $list = get_option('wpvivid_import_list_cache',array());
            if(empty($list))
            {
                $ret['result']='success';
            }
            else
            {
                if(isset($list[$id]))
                {
                    $item=$list[$id];
                    if(isset($item['export']))
                    {
                        foreach ($item['export'] as $file)
                        {
                            $path=WP_CONTENT_DIR.DIRECTORY_SEPARATOR.WPvivid_Setting::get_backupdir().DIRECTORY_SEPARATOR.WPVIVID_IMPORT_EXPORT_DIR.DIRECTORY_SEPARATOR.$file['file_name'];
                            @wp_delete_file($path);
                        }
                    }
                    unset($list[$id]);
                    WPvivid_Setting::update_option('wpvivid_import_list_cache',$list);
                    $ret['result']='success';
                }
                else
                {
                    $ret['result']='success';
                }
            }
            echo wp_json_encode($ret);
        }
        die();
    }

    public function wpvivid_download_export_backup()
    {
        check_ajax_referer( 'wpvivid_ajax', 'nonce' );
        $check=current_user_can('manage_options');
        $check=apply_filters('wpvivid_ajax_check_security',$check);
        if(!$check)
        {
            die();
        }
        try{
            if(isset($_REQUEST['file_name']) && !empty($_REQUEST['file_name']) && is_string($_REQUEST['file_name']) &&
                isset($_REQUEST['file_size']) && !empty($_REQUEST['file_size']) && is_string($_REQUEST['file_size'])){
                $file_name = sanitize_text_field($_REQUEST['file_name']);
                $file_size = intval(sanitize_key($_REQUEST['file_size']));

                $file_name = basename($file_name);

                $path=WP_CONTENT_DIR.DIRECTORY_SEPARATOR.WPvivid_Setting::get_backupdir().DIRECTORY_SEPARATOR.WPVIVID_IMPORT_EXPORT_DIR.DIRECTORY_SEPARATOR.$file_name;
                if (file_exists($path)) {
                    if (session_id()) {
                        session_write_close();
                    }
                    $size = filesize($path);
                    if($size === $file_size) {
                        if (!headers_sent()) {
                            header('Content-Description: File Transfer');
                            header('Content-Type: application/zip');
                            header('Content-Disposition: attachment; filename="' . basename($path) . '"');
                            header('Cache-Control: must-revalidate');
                            header('Content-Length: ' . $size);
                            header('Content-Transfer-Encoding: binary');
                        }
                        if ($size < 1024 * 1024 * 60) {
                            ob_end_clean();
                            readfile($path);
                            exit;
                        } else {
                            ob_end_clean();
                            $download_rate = 1024 * 10;
                            $file = fopen($path, "r");
                            while (!feof($file)) {
                                @set_time_limit(20);
                                // send the current file part to the browser
                                print fread($file, round($download_rate * 1024));
                                // flush the content to the browser
                                flush();
                                // sleep one second
                                sleep(1);
                            }
                            fclose($file);
                            exit;
                        }
                    }
                    else{
                        $admin_url = admin_url();
                        echo '<a href="'.esc_url($admin_url).'admin.php?page=wpvivid-export-import">';
                        esc_html_e('File size not match. please retry again.', 'wpvivid-backuprestore');
                        echo '</a>';
                        die();
                    }
                }

                $admin_url = admin_url();
                echo '<a href="'.esc_url($admin_url).'admin.php?page=wpvivid-export-import">';
                esc_html_e('File not found. Please retry again.', 'wpvivid-backuprestore');
                echo '</a>';
                die();
            }
        }
        catch (Exception $error) {
            $message = 'An exception has occurred. class: '.get_class($error).';msg: '.$error->getMessage().';code: '.$error->getCode().';line: '.$error->getLine().';in_file: '.$error->getFile().';';
            error_log($message);
            echo wp_json_encode(array('result'=>'failed','error'=>$message));
            die();
        }
    }

    //import
    public function output_import()
    {
        $import_dir = WP_CONTENT_DIR.DIRECTORY_SEPARATOR.WPvivid_Setting::get_backupdir().DIRECTORY_SEPARATOR.WPVIVID_IMPORT_EXPORT_DIR;
        WPvivid_Setting::update_option('wpvivid_import_list_cache',array());
        WPvivid_Setting::update_option('wpvivid_importer_task_list', array());
        ?>
        <div class="postbox export-import-block">
            <div>
                <div class="wpvivid-element-space-bottom wpvivid-element-space-right" style="float: left;">
                    <img src="<?php echo esc_url(WPVIVID_PLUGIN_IMAGES_URL.'export-import.png'); ?>" style="width:50px;height:50px;">
                </div>
                <div style="box-sizing: border-box;">
                    <div class="wpvivid-element-space-bottom wpvivid-element-space-right"><?php esc_html_e('Import posts or pages with images in bulk.', 'wpvivid-backuprestore'); ?>
                        <span class="wpvivid-feature-pro">
                            <a href="https://wpvivid.com/import-content" target="_blank" style="text-decoration: none;"><?php esc_html_e('Learn more', 'wpvivid-backuprestore'); ?></a>
                        </span>
                    </div>
                    <div class="wpvivid-element-space-bottom wpvivid-element-space-right"><strong><?php esc_html_e('Note:', 'wpvivid-backuprestore'); ?></strong>
                        <?php esc_html_e('To properly display the imported content, please make sure that the importing and exporting sites have the same environment, for example, same theme or pages built with the same page builder.', 'wpvivid-backuprestore'); ?>
                    </div>
                    <div style="clear: both;"></div>
                </div>
                <div style="clear: both;"></div>
            </div>
            <div style="clear: both;"></div>

            <div style="background: #fff; border: 1px solid #e5e5e5; border-radius: 6px; margin-bottom: 10px; padding: 10px;">
                <div style="margin-right: 10px; float: left; height: 28px; line-height: 28px;"><?php echo esc_html(sprintf('Imported files will be temporarily stored in %s directory', $import_dir)) ?></div>
                <div style="float: left;"><input class="button" type="submit" id="wpvivid_empty_import_folder" value="<?php esc_attr_e('Delete Exported Files In Folder', 'wpvivid-backuprestore'); ?>" onclick="wpvivid_clean_import_folder();" /></div>
                <div style="clear: both;"></div>
            </div>

            <div id="wpvivid_import_step1">
                <p><?php esc_html_e('Choose an export from your computer to import: ', 'wpvivid-backuprestore'); ?></p>
                <input class="button button-primary" type="button" id="wpvivid_select_import_file_button" value="<?php esc_attr_e('Upload and Import', 'wpvivid-backuprestore'); ?>" />
                <div id="wpvivid_upload_file_list" class="hide-if-no-js" style="margin-top: 10px; display: none;"></div>
                <br>
                <p><?php echo esc_html(sprintf('Or you can use ftp to upload the export to the directory %s. Then click the button below to scan the file to import.', $import_dir)); ?></p>
                <input class="button button-primary" type="button" value="<?php esc_attr_e('Scan Uploaded Exports', 'wpvivid-backuprestore'); ?>" onclick="wpvivid_refresh_import_list();" />
                <div class="wpvivid-export-import-block" id="wpvivid_import_list" style="margin-top: 10px; display: none;"></div>
            </div>
            <div id="wpvivid_import_step2" style="display: none;">
                <h3><?php esc_html_e('The importing file info', 'wpvivid-backuprestore'); ?></h3>
                <div id="wpvivid_import_file_data">
                </div>
                <h3><?php esc_html_e('Assign author', 'wpvivid-backuprestore'); ?></h3>
                <div>
                    <?php esc_html_e('Select an existing author:', 'wpvivid-backuprestore'); ?>
                    <?php wp_dropdown_users( array( 'name' => "user_map", 'multi' => true, 'show_option_all' => __( '- Select -', 'wpvivid-backuprestore' ) ) );?>
                </div>
                <h3><?php esc_html_e('Import Setting', 'wpvivid-backuprestore'); ?></h3>
                <div style="margin-bottom: 10px;">
                    <label>
                        <input type="checkbox" id="wpvivid_overwrite_existing" />
                        <span><strong id="wpvivid_import_type"><?php esc_html_e('Overwrite existing pages', 'wpvivid-backuprestore'); ?></strong></span>
                    </label>
                </div>
                <div style="margin-bottom: 10px;">
                    <span><?php esc_html_e('With this option checked, Pages/posts already existing will be overwritten with the updated ones in an import.', 'wpvivid-backuprestore'); ?></span>
                </div>
                <input class="button button-primary" type="button" id="wpvivid_start_import" value="<?php esc_attr_e('Import', 'wpvivid-backuprestore'); ?>" />
                <input class="button button-primary" type="button" id="wpvivid_rechoose_import_file" value="<?php esc_attr_e('Back', 'wpvivid-backuprestore'); ?>" />
            </div>
            <div id="wpvivid_import_step3" style="display: none;">
                <div class="postbox wpvivid-import-log" id="wpvivid_import_log" style="margin-top: 10px; margin-bottom: 0;"></div>
            </div>
        </div>
        <?php
        $chunk_size = min(wp_max_upload_size()-1024, 1048576*2);
        $plupload_init = array(
            'runtimes'            => 'html5,silverlight,flash,html4',
            'browse_button'       => 'wpvivid_select_import_file_button',
            'file_data_name'      => 'async-upload',
            'max_retries'		    => 3,
            'multiple_queues'     => true,
            'max_file_size'       => '10Gb',
            'chunk_size'        => $chunk_size.'b',
            'url'                 => admin_url('admin-ajax.php'),
            'flash_swf_url'       => includes_url('js/plupload/plupload.flash.swf'),
            'silverlight_xap_url' => includes_url('js/plupload/plupload.silverlight.xap'),
            'multipart'           => true,
            'urlstream_upload'    => true,
            'multi_selection'      => false,
            // additional post data to send to our ajax hook
            'multipart_params'    => array(
                '_ajax_nonce' => wp_create_nonce('wpvivid_ajax'),
                'action'      => 'wpvivid_upload_import_files',            // the ajax action name
            ),
        );
        if (is_file(ABSPATH.WPINC.'/js/plupload/Moxie.swf')) {
            $plupload_init['flash_swf_url'] = includes_url('js/plupload/Moxie.swf');
        } else {
            $plupload_init['flash_swf_url'] = includes_url('js/plupload/plupload.flash.swf');
        }

        if (is_file(ABSPATH.WPINC.'/js/plupload/Moxie.xap')) {
            $plupload_init['silverlight_xap_url'] = includes_url('js/plupload/Moxie.xap');
        } else {
            $plupload_init['silverlight_xap_url'] = includes_url('js/plupload/plupload.silverlight.swf');
        }

        // we should probably not apply this filter, plugins may expect wp's media uploader...
        $plupload_init = apply_filters('plupload_init', $plupload_init);
        $upload_file_image = includes_url( '/images/media/archive.png' );
        ?>
        <script type="text/javascript">
            var uploader;
            var import_file_name='';
            jQuery(document).ready(function($)
            {
                // create the uploader and pass the config from above
                jQuery('#wpvivid_upload_submit_btn').hide();
                uploader = new plupload.Uploader(<?php echo wp_json_encode($plupload_init); ?>);

                // checks if browser supports drag and drop upload, makes some css adjustments if necessary
                uploader.bind('Init', function(up)
                {
                    var uploaddiv = $('#wpvivid_plupload-upload-ui');

                    if(up.features.dragdrop){
                        uploaddiv.addClass('drag-drop');
                        $('#drag-drop-area')
                            .bind('dragover.wp-uploader', function(){ uploaddiv.addClass('drag-over'); })
                            .bind('dragleave.wp-uploader, drop.wp-uploader', function(){ uploaddiv.removeClass('drag-over'); });

                    }else{
                        uploaddiv.removeClass('drag-drop');
                        $('#drag-drop-area').unbind('.wp-uploader');
                    }
                });
                uploader.init();

                function wpvivid_check_plupload_added_files(up, files)
                {
                    jQuery('#wpvivid_import_list').hide();
                    var file=files[0];

                    var ajax_data = {
                        'action': 'wpvivid_check_import_file',
                        'file_name':file.name
                    };
                    wpvivid_post_request(ajax_data, function (data)
                    {
                        var jsonarray = jQuery.parseJSON(data);
                        if (jsonarray.result === "success")
                        {
                            jQuery('#wpvivid_select_import_file_button').css({'pointer-events': 'none', 'opacity': '0.4'});
                            var repeat_files = '';
                            plupload.each(files, function(file)
                            {
                                var brepeat=false;
                                var file_list = jQuery('#wpvivid_upload_file_list span');
                                file_list.each(function (index, value) {
                                    if (value.innerHTML === file.name) {
                                        brepeat=true;
                                    }
                                });
                                if(!brepeat) {
                                    jQuery('#wpvivid_upload_file_list').append(
                                        '<div id="' + file.id + '" style="width: 100%; height: 36px; background: #f1f1f1; margin-bottom: 1px;">' +
                                        '<img src=" <?php echo esc_attr($upload_file_image); ?> " alt="" style="float: left; margin: 2px 10px 0 3px; max-width: 40px; max-height: 32px;">' +
                                        '<div style="line-height: 36px; float: left; margin-left: 5px;"><span>' + file.name + '</span></div>' +
                                        '<div class="fileprogress" style="line-height: 36px; float: right; margin-right: 5px;"></div>' +
                                        '</div>' +
                                        '<div style="clear: both;"></div>'
                                    );
                                    jQuery('#wpvivid_upload_file_list').show();

                                    uploader.refresh();
                                    uploader.start();
                                }
                                else{
                                    if(repeat_files === ''){
                                        repeat_files += file.name;
                                    }
                                    else{
                                        repeat_files += ', ' + file.name;
                                    }
                                }
                            });
                            if(repeat_files !== ''){
                                alert(repeat_files + " already exists in upload list.");
                                repeat_files = '';
                            }
                        }
                        else if(jsonarray.result === "failed")
                        {
                            uploader.removeFile(file);
                            alert(jsonarray.error);
                        }
                    }, function (XMLHttpRequest, textStatus, errorThrown)
                    {
                        var error_message = wpvivid_output_ajaxerror('uploading backups', textStatus, errorThrown);
                        uploader.removeFile(file);
                        alert(error_message);
                    });
                }

                uploader.bind('FilesAdded', wpvivid_check_plupload_added_files);

                uploader.bind('Error', function(up, error)
                {
                    alert('Upload ' + error.file.name +' error, error code: ' + error.code + ', ' + error.message);
                    console.log(error);
                });

                uploader.bind('FileUploaded', function(up, file, response)
                {
                    var jsonarray = jQuery.parseJSON(response.response);
                    if(jsonarray.result == 'failed'){
                        alert('upload ' + file.name + ' failed, ' + jsonarray.error);
                    }
                });

                uploader.bind('UploadProgress', function(up, file)
                {
                    jQuery('#' + file.id + " .fileprogress").html(file.percent + "%");
                });

                uploader.bind('UploadComplete',function(up, files)
                {
                    jQuery('#wpvivid_select_import_file_button').css({'pointer-events': 'auto', 'opacity': '1'});
                    var ajax_data = {
                        'action': 'wpvivid_upload_import_file_complete',
                        'files':JSON.stringify(files)
                    };
                    wpvivid_post_request(ajax_data, function (data)
                    {
                        try
                        {
                            var jsonarray = jQuery.parseJSON(data);
                            if(jsonarray.result === 'success')
                            {
                                jQuery('#wpvivid_upload_file_list').html("");
                                jQuery('#wpvivid_upload_file_list').hide();
                                wpvivid_import_step2(jsonarray.data);
                            }
                            else if(jsonarray.result === 'failed')
                            {
                                jQuery('#wpvivid_upload_file_list').html("");
                                jQuery('#wpvivid_upload_file_list').hide();
                                alert(jsonarray.error);
                            }
                        }
                        catch(err)
                        {
                            alert(err);
                        }
                    }, function (XMLHttpRequest, textStatus, errorThrown)
                    {
                        var error_message = wpvivid_output_ajaxerror('refreshing backup list', textStatus, errorThrown);
                        alert(error_message);
                    });
                    plupload.each(files, function(file)
                    {
                        if(typeof file === 'undefined')
                        {

                        }
                        else
                        {
                            uploader.removeFile(file.id);
                        }
                    });
                })
            });

            function wpvivid_clean_import_folder()
            {
                var descript = '<?php esc_html_e('Are you sure you want to delete all the exported files in the /ImportandExport folder? All the export files in the folder will be permanently deleted.', 'wpvivid-backuprestore'); ?>';
                var ret = confirm(descript);
                if(ret === true){
                    var ajax_data = {
                        'action': 'wpvivid_clean_import_folder'
                    };
                    wpvivid_post_request(ajax_data, function (data)
                    {
                        try {
                            var jsonarray = jQuery.parseJSON(data);
                            if(jsonarray.html !== false) {
                                jQuery('#wpvivid_import_list').html(jsonarray.html);
                                jQuery('#wpvivid_empty_import_folder').val('<?php esc_attr_e('Delete Exported Files In Folder', 'wpvivid-backuprestore'); ?> ('+jsonarray.size+')');
                            }
                        }
                        catch(err) {
                            alert(err);
                        }
                    }, function (XMLHttpRequest, textStatus, errorThrown) {
                        var error_message = wpvivid_output_ajaxerror('scanning import folder', textStatus, errorThrown);
                        alert(error_message);
                    });
                }
            }

            function wpvivid_import_step2(data)
            {
                jQuery('#wpvivid_import_file_data').html('');
                var import_type = 'pages';
                jQuery.each(data, function (index, value)
                {
                    import_type = value['export_type'];
                    import_file_name=value['file_name'];
                    var list = "";
                    var myDate = new Date(value['time']*1000);
                    list += "<li>File name: " + value['file_name'] + "</li>";
                    list += "<li>Post type: " + value['export_type'] + "</li>";
                    list += "<li>Posts: " + value['posts_count'] + "</li>";
                    list += "<li>Media files size: " + value['media_size'] + "</li>";
                    list += "<li>Export time: " + myDate.toLocaleString('en-us') + "</li>";
                    jQuery("#wpvivid_import_file_data").append("<ul>"+ list +"</ul>");
                });

                jQuery('#wpvivid_import_type').html('Overwrite existing '+import_type+'s');

                jQuery('#wpvivid_import_step1').hide();
                jQuery('#wpvivid_import_step2').show();
                jQuery('#wpvivid_import_step3').hide();
            }

            function wpvivid_import_step3()
            {
                jQuery('#wpvivid_import_step1').hide();
                jQuery('#wpvivid_import_step2').hide();
                jQuery('#wpvivid_import_step3').show();
            }

            function wpvivid_return_import_page(){
                jQuery('#wpvivid_import_step1').show();
                jQuery('#wpvivid_import_step2').hide();
                jQuery('#wpvivid_import_step3').hide();
            }

            function wpvivid_monitor_import_task()
            {
                var ajax_data = {
                    'action': 'wpvivid_get_import_progress',
                };
                wpvivid_post_request(ajax_data, function(data)
                {
                    try
                    {
                        var jsonarray = jQuery.parseJSON(data);
                        if (typeof jsonarray === 'object')
                        {
                            if (jsonarray.result === 'success')
                            {
                                jQuery('#wpvivid_import_log').html("");
                                while (jsonarray.log.indexOf('\n') >= 0)
                                {
                                    var iLength = jsonarray.log.indexOf('\n');
                                    var log = jsonarray.log.substring(0, iLength);
                                    jsonarray.log = jsonarray.log.substring(iLength + 1);
                                    var insert_log = "<div style=\"clear:both;\">" + log + "</div>";
                                    jQuery('#wpvivid_import_log').append(insert_log);
                                    var div = jQuery('#wpvivid_import_log');
                                    div[0].scrollTop = div[0].scrollHeight;
                                }
                                if (jsonarray.status === 'wait')
                                {
                                    setTimeout(function () {
                                        wpvivid_monitor_import_task();
                                    }, 1000);
                                }
                                else if (jsonarray.status === 'completed')
                                {
                                    var insert_log = "<div style=\"clear:both;\"><a style='cursor: pointer;' onclick='wpvivid_return_import_page();'>Return import page</a></div>";
                                    jQuery('#wpvivid_import_log').append(insert_log);
                                    var div = jQuery('#wpvivid_import_log');
                                    div[0].scrollTop = div[0].scrollHeight;
                                    setTimeout(function () {
                                        alert("<?php esc_html_e('Import completed successfully.', 'wpvivid-backuprestore'); ?>");
                                    }, 1000);
                                    wpvivid_import_lock_unlock('unlock');
                                }
                                else if (jsonarray.status === 'error')
                                {
                                    alert("<?php esc_html_e('Import failed.', 'wpvivid-backuprestore'); ?>");
                                    wpvivid_import_lock_unlock('unlock');
                                }
                                else
                                {
                                    setTimeout(function ()
                                    {
                                        wpvivid_monitor_import_task();
                                    }, 1000);
                                }
                            }
                            else {
                                setTimeout(function () {
                                    wpvivid_monitor_import_task();
                                }, 1000);
                            }
                        }
                        else{
                            setTimeout(function () {
                                wpvivid_monitor_import_task();
                            }, 1000);
                        }
                    }
                    catch (err) {
                        setTimeout(function () {
                            wpvivid_monitor_import_task();
                        }, 1000);
                    }
                },function(XMLHttpRequest, textStatus, errorThrown) {
                    setTimeout(function () {
                        wpvivid_monitor_import_task();
                    }, 1000);
                });
            }

            jQuery('#wpvivid_start_import').click(function()
            {
                if(import_file_name!=='')
                {
                    var descript = '';
                    var user=jQuery('select[name="user_map"]').val();
                    if(user !== '0'){
                        wpvivid_start_import(import_file_name, user);
                    }
                    else{
                        alert('<?php esc_html_e('Please select an existing author to start importing.', 'wpvivid-backuprestore'); ?>');
                    }
                }
            });

            jQuery('#wpvivid_rechoose_import_file').click(function(){
                jQuery('#wpvivid_import_step1').show();
                jQuery('#wpvivid_import_step2').hide();
                jQuery('#wpvivid_import_step3').hide();
            });

            function wpvivid_start_import (file_name, user)
            {
                if(jQuery('#wpvivid_overwrite_existing').prop('checked')){
                    var overwrite_existing = 1;
                }
                else{
                    var overwrite_existing = 0;
                }

                wpvivid_import_lock_unlock('lock');
                wpvivid_monitor_import_task();
                wpvivid_import_step3();
                var ajax_data = {
                    'action':'wpvivid_start_import',
                    'file_name':file_name,
                    'user':user,
                    'update_exist':overwrite_existing
                };

                wpvivid_post_request(ajax_data, function(data)
                {
                }, function(XMLHttpRequest, textStatus, errorThrown)
                {
                });
            }

            var wpvivid_scan_data={};

            function wpvivid_refresh_import_list()
            {
                var ajax_data = {
                    'action': 'wpvivid_scan_import_folder'
                };
                wpvivid_post_request(ajax_data, function (data)
                {
                    try {
                        var jsonarray = jQuery.parseJSON(data);
                        if(jsonarray.html !== false)
                        {
                            wpvivid_scan_data=jsonarray.data;
                            jQuery('#wpvivid_import_list').show();
                            jQuery('#wpvivid_import_list').html(jsonarray.html);
                        }
                    }
                    catch(err) {
                        alert(err);
                    }
                }, function (XMLHttpRequest, textStatus, errorThrown)
                {
                    var error_message = wpvivid_output_ajaxerror('scanning import folder', textStatus, errorThrown);
                    alert(error_message);
                });
            }

            jQuery('#wpvivid_import_list').on("click",'.first-page',function()
            {
                wpvivid_change_import_page('first');
            });

            jQuery('#wpvivid_import_list').on("click",'.prev-page',function()
            {
                var page=parseInt(jQuery(this).attr('value'));
                wpvivid_change_import_page(page-1);
            });

            jQuery('#wpvivid_import_list').on("click",'.next-page',function()
            {
                var page=parseInt(jQuery(this).attr('value'));
                wpvivid_change_import_page(page+1);
            });

            jQuery('#wpvivid_import_list').on("click",'.last-page',function()
            {
                wpvivid_change_import_page('last');
            });

            jQuery('#wpvivid_import_list').on("keypress", '.current-page', function(){
                if(event.keyCode === 13){
                    var page = jQuery(this).val();
                    wpvivid_change_import_page(page);
                }
            });

            function wpvivid_change_import_page(page)
            {
                var post_ids = {};

                jQuery('input[name="export[]"]').each(function (i)
                {
                    var id=jQuery(this).val();
                    if(jQuery(this).prop('checked'))
                    {
                        post_ids[id]=1;
                    }
                    else
                    {
                        post_ids[id]=0;
                    }
                });

                var ajax_data = {
                    'action':'wpvivid_get_import_list_page',
                    'page': page,
                    'post_ids':post_ids
                };

                wpvivid_post_request(ajax_data, function(data)
                {
                    var jsonarray = jQuery.parseJSON(data);
                    if (jsonarray.result === 'success')
                    {
                        jQuery('#wpvivid_import_list').html(jsonarray.rows);
                    }
                    else if (jsonarray.result === 'failed')
                    {
                        alert(jsonarray.error);
                    }
                }, function(XMLHttpRequest, textStatus, errorThrown)
                {
                    var error_message = wpvivid_output_ajaxerror('export the previously-exported settings', textStatus, errorThrown);
                    alert(error_message);
                });
            }

            jQuery('#wpvivid_import_list').on("click",".wpvivid-export-list-item td",function()
            {
                var id = jQuery(this).parent().attr('id');

                if(jQuery(this).find('div.export-list-import').length !== 0)
                {
                    var data={};
                    data[id]=wpvivid_scan_data[id];
                    console.log(data[id]);
                    wpvivid_import_step2(data);
                    jQuery('#wpvivid_import_list').hide();
                }
            });

            function wpvivid_calc_import_folder_size(){
                var ajax_data = {
                    'action': 'wpvivid_calc_import_folder_size'
                };
                wpvivid_post_request(ajax_data, function(data)
                {
                    var jsonarray = jQuery.parseJSON(data);
                    if (jsonarray.result === 'success')
                    {
                        jQuery('#wpvivid_empty_import_folder').val('<?php esc_attr_e('Delete Exported Files In Folder', 'wpvivid-backuprestore'); ?> ('+jsonarray.size+')');
                    }
                }, function(XMLHttpRequest, textStatus, errorThrown)
                {
                    var error_message = wpvivid_output_ajaxerror('calc import folder size', textStatus, errorThrown);
                    alert(error_message);
                });
            }

            jQuery(document).ready(function (){
                wpvivid_calc_import_folder_size();
            });
        </script>
        <?php
    }

    public function wpvivid_check_import_file_name($file_name){
        if(preg_match('/wpvivid-.*_.*_export_.*\.zip$/', $file_name))
        {
            if(preg_match('/wpvivid-(.*?)_/',$file_name,$matches))
            {
                $id= $matches[0];
                $id=substr($id,0,strlen($id)-1);
                $ret['result']=WPVIVID_SUCCESS;
                $ret['id']=$id;
            }
            else
            {
                $ret['result']=WPVIVID_FAILED;
                $ret['error']=$file_name.' is not the file exported by WPvivid backup plugin.';
            }
        }
        else
        {
            $ret['result']=WPVIVID_FAILED;
            $ret['error']=$file_name.' is not the file exported by WPvivid backup plugin.';
        }
        return $ret;
    }

    public function check_import_file()
    {
        check_ajax_referer( 'wpvivid_ajax', 'nonce' );
        $check=current_user_can('manage_options');
        $check=apply_filters('wpvivid_ajax_check_security',$check);
        if(!$check)
        {
            die();
        }
        $file_name = sanitize_text_field($_POST['file_name']);
        if(isset($file_name))
        {
            $ret = $this->wpvivid_check_import_file_name($file_name);
        }
        else
        {
            $ret['result']=WPVIVID_FAILED;
            $ret['error']='Failed to post file name.';
        }

        echo wp_json_encode($ret);
        die();
    }

    public function upload_import_dir($uploads)
    {
        $uploads['path'] = WP_CONTENT_DIR.DIRECTORY_SEPARATOR.WPvivid_Setting::get_backupdir().DIRECTORY_SEPARATOR.WPVIVID_IMPORT_EXPORT_DIR;
        return $uploads;
    }

    public function upload_import_files()
    {
        check_ajax_referer( 'wpvivid_ajax', 'nonce' );
        $check=current_user_can('manage_options');
        $check=apply_filters('wpvivid_ajax_check_security',$check);
        if(!$check)
        {
            die();
        }
        $options['test_form'] =true;
        $options['action'] ='wpvivid_upload_import_files';
        $options['test_type'] = false;
        $options['ext'] = 'zip';
        $options['type'] = 'application/zip';
        add_filter('upload_dir', array($this, 'upload_import_dir'));

        $file_name=basename(sanitize_text_field($_POST['name']));
        $validate = wp_check_filetype( $file_name );
        if ( $validate['type'] == false )
        {
            echo wp_json_encode(array('result'=>WPVIVID_FAILED, 'error' => 'File type is not allowed.'));
            die();
        }

        $status = wp_handle_upload($_FILES['async-upload'],$options);

        remove_filter('upload_dir', array($this, 'upload_import_dir'));
        if (isset($status['error']))
        {
            echo wp_json_encode(array('result'=>WPVIVID_FAILED, 'error' => $status['error']));
            exit;
        }

        if (isset($_POST['chunks']) && isset($_POST['chunk']))
        {
            $chunks=sanitize_key($_POST['chunks']);
            $chunk=sanitize_key($_POST['chunk']);
            $path=WP_CONTENT_DIR.DIRECTORY_SEPARATOR.WPvivid_Setting::get_backupdir().DIRECTORY_SEPARATOR.WPVIVID_IMPORT_EXPORT_DIR.DIRECTORY_SEPARATOR;
            rename($status['file'],$path.$file_name.'_'.$chunk.'.tmp');
            $status['file'] = $path.$file_name.'_'.$chunk.'.tmp';
            if($chunk == $chunks-1)
            {
                $file_handle = fopen($path.$file_name, 'wb');
                if ($file_handle)
                {
                    for ($i=0; $i<$chunks; $i++)
                    {
                        $chunks_handle=fopen($path.$file_name.'_'.$i.'.tmp','rb');
                        if($chunks_handle)
                        {
                            while ($line = fread($chunks_handle, 1048576*2))
                            {
                                fwrite($file_handle, $line);
                            }
                            fclose($chunks_handle);
                            @wp_delete_file($path.$file_name.'_'.$i.'.tmp');
                        }
                    }
                    fclose($file_handle);
                }
            }
        }
        echo wp_json_encode(array('result'=>WPVIVID_SUCCESS));
        die();
    }

    public function get_import_progress()
    {
        try
        {
            check_ajax_referer( 'wpvivid_ajax', 'nonce' );
            $check=current_user_can('manage_options');
            $check=apply_filters('wpvivid_ajax_check_security',$check);
            if(!$check)
            {
                die();
            }

            $tasks=WPvivid_Impoter_taskmanager::get_tasks();
            foreach ($tasks as $task)
            {
                WPvivid_Impoter_taskmanager::get_task($task['id']);
                $import_log = new WPvivid_import_data();
                $ret['result'] = 'success';
                $ret['status'] = WPvivid_Impoter_taskmanager::get_import_task_status($task['id']);
                if ($ret['status'] === 'error')
                {
                    WPvivid_Impoter_taskmanager::delete_task($task['id']);
                }
                if($ret['status'] === 'completed')
                {
                    WPvivid_Impoter_taskmanager::delete_task($task['id']);
                }
                $ret['log'] = $import_log->get_log_content();
                echo wp_json_encode($ret);
                die();
            }
            $ret['result'] = 'success';
            $ret['status'] ='wait';
            $ret['log']='';
            echo wp_json_encode($ret);
            die();
        }
        catch (Exception $error) {
            $message = 'An exception has occurred. class: '.get_class($error).';msg: '.$error->getMessage().';code: '.$error->getCode().';line: '.$error->getLine().';in_file: '.$error->getFile().';';
            error_log($message);
            echo wp_json_encode(array('result'=>'failed','error'=>$message));
            die();
        }
    }

    public function upload_import_file_complete()
    {
        check_ajax_referer( 'wpvivid_ajax', 'nonce' );
        $check=current_user_can('manage_options');
        $check=apply_filters('wpvivid_ajax_check_security',$check);
        if(!$check)
        {
            die();
        }

        $ret['html']=false;
        if(isset($_POST['files']))
        {
            $files =sanitize_text_field($_POST['files']);
            $files =stripslashes($files);
            $files =json_decode($files,true);
            if(is_null($files))
            {
                $ret['result']=WPVIVID_FAILED;
                $ret['error']= 'Failed to decode files.';
                echo wp_json_encode($ret);
                die();
            }

            $path=WP_CONTENT_DIR.DIRECTORY_SEPARATOR.WPvivid_Setting::get_backupdir().DIRECTORY_SEPARATOR.WPVIVID_IMPORT_EXPORT_DIR.DIRECTORY_SEPARATOR;

            //if(preg_match('/wpvivid-.*_.*_to_.*\.zip$/',$files[0]['name']))
            //{
                $data=array();
                $check_result=true;
                foreach ($files as $file)
                {
                    $res=$this->check_is_import_file($path.$file['name']);
                    if($res['result'] =='success')
                    {
                        $add_file['file_name']=$file['name'];
                        $add_file['size']=filesize($path.$file['name']);
                        $add_file['export_type']=$res['export_type'];
                        $add_file['export_comment']=$res['export_comment'];
                        $add_file['posts_count']=$res['posts_count'];
                        $add_file['media_size']=size_format($res['media_size'],2);
                        $add_file['time']=$res['time'];
                        $data[]=$add_file;
                    }
                    else
                    {
                        $check_result=false;
                    }
                }

                if($check_result === true)
                {
                    $ret['result']=WPVIVID_SUCCESS;
                    $ret['data']=$data;
                }
                else
                {
                    $ret['result']=WPVIVID_FAILED;
                    $ret['error']='Upload file failed.';
                    foreach ($files as $file)
                    {
                        $this->clean_tmp_files($path, $file['name']);
                        @wp_delete_file($path . $file['name']);
                    }
                }
            /*}
            else
            {
                $ret['result']=WPVIVID_FAILED;
                $ret['error']='The file is not created by WPvivid backup plugin.';
            }*/
        }
        else {
            $ret['result']=WPVIVID_FAILED;
            $ret['error']='Failed to post file name.';
        }
        echo wp_json_encode($ret);
        die();
    }

    public function check_is_import_file($file_name)
    {
        $ret=$this->get_backup_file_info($file_name);
        if($ret['result'] === WPVIVID_SUCCESS)
        {
            $export_type_support_array = array('post', 'page');
            if(isset($ret['json_data']['post_type']) && in_array($ret['json_data']['post_type'], $export_type_support_array))
            {
                $ret['export_type']=$ret['json_data']['post_type'];
                $ret['export_comment']=isset($ret['json_data']['post_comment']) ? $ret['json_data']['post_comment'] : 'N/A';
                $ret['export_time']=isset($ret['json_data']['create_time']) ? $ret['json_data']['create_time'] : '';
                $ret['posts_count']=isset($ret['json_data']['posts_count']) ? $ret['json_data']['posts_count'] : 0;
                $ret['media_size']=isset($ret['json_data']['media_size']) ? $ret['json_data']['media_size'] : 0;
                $ret['time']=isset($ret['json_data']['create_time']) ? $ret['json_data']['create_time'] : time();
                return $ret;
            }
            else{
                $ret['result'] = WPVIVID_FAILED;
                $ret['error'] = 'The backup is not an import file.';
                return $ret;
            }
        }
        else
        {
            return $ret;
        }
    }

    public function get_backup_file_info($file_name)
    {
        if(!class_exists('WPvivid_ZipClass'))
            include_once WPVIVID_PLUGIN_DIR . '/includes/class-wpvivid-zipclass.php';
        $zip=new WPvivid_ZipClass();
        $ret=$zip->get_json_data($file_name, 'export');
        if($ret['result'] === WPVIVID_SUCCESS)
        {
            $json=$ret['json_data'];
            $json = json_decode($json, 1);
            if (is_null($json))
            {
                return array('result'=>WPVIVID_FAILED,'error'=>'Failed to decode json');
            } else {
                return array('result'=>WPVIVID_SUCCESS,'json_data'=>$json);
            }
        }
        else {
            return $ret;
        }
    }

    function clean_tmp_files($path, $filename){
        $handler=opendir($path);
        if($handler===false)
            return;
        while(($file=readdir($handler))!==false) {
            if (!is_dir($path.$file) && preg_match('/wpvivid-.*_.*_.*\.tmp$/', $file)) {
                $iPos = strrpos($file, '_');
                $file_temp = substr($file, 0, $iPos);
                if($file_temp === $filename) {
                    @wp_delete_file($path.$file);
                }
            }
        }
        @closedir($handler);
    }

    function wpvivid_write_upload_log($message, $id = ''){
        if($id === ''){
            $id=uniqid('wpvivid-');
        }
        global $wpvivid_plugin;
        $wpvivid_plugin->upload_log=new WPvivid_Log();
        $wpvivid_plugin->upload_log->CreateLogFile($id.'_upload','no_folder','upload');
        $wpvivid_plugin->upload_log->WriteLogHander();
        $wpvivid_plugin->upload_log->WriteLog($message,'notice');
    }

    public function wpvivid_check_is_import_file_ex($file_name, &$backup_id){
        if(preg_match('/wpvivid-.*_.*_to_.*\.zip$/', $file_name))
        {
            if(preg_match('/wpvivid-(.*?)_/', $file_name, $matches))
            {
                $id= $matches[0];
                $id=substr($id,0,strlen($id)-1);
                $backup_id=$id;
                return true;
            }
            else
            {
                return false;
            }
        }
        else
        {
            return false;
        }
    }

    public function calc_import_folder_size()
    {
        global $wpvivid_plugin;
        check_ajax_referer( 'wpvivid_ajax', 'nonce' );
        $check=current_user_can('manage_options');
        $check=apply_filters('wpvivid_ajax_check_security',$check);
        if(!$check)
        {
            die();
        }
        $path = WP_CONTENT_DIR.DIRECTORY_SEPARATOR.WPvivid_Setting::get_backupdir().DIRECTORY_SEPARATOR.WPVIVID_IMPORT_EXPORT_DIR.DIRECTORY_SEPARATOR;
        $bytes_total = 0;
        $path = realpath($path);
        if($path!==false && $path!='' && file_exists($path))
        {
            foreach(new RecursiveIteratorIterator(new RecursiveDirectoryIterator($path, FilesystemIterator::SKIP_DOTS)) as $object){
                $bytes_total += $object->getSize();
            }
        }
        $ret['result'] = WPVIVID_SUCCESS;
        $ret['size']   = $wpvivid_plugin->formatBytes($bytes_total);
        echo wp_json_encode($ret);
        die();
    }

    public function clean_import_folder(){
        check_ajax_referer( 'wpvivid_ajax', 'nonce' );
        $check=current_user_can('manage_options');
        $check=apply_filters('wpvivid_ajax_check_security',$check);
        if(!$check)
        {
            die();
        }
        $path = WP_CONTENT_DIR.DIRECTORY_SEPARATOR.WPvivid_Setting::get_backupdir().DIRECTORY_SEPARATOR.WPVIVID_IMPORT_EXPORT_DIR.DIRECTORY_SEPARATOR;
        if(is_dir($path))
        {
            $handler = opendir($path);
            if($handler!==false)
            {
                while (($filename = readdir($handler)) !== false){
                    if ($filename != "." && $filename != ".."){
                        if (is_dir($path  . $filename)) {
                            continue;
                        }
                        else{
                            $res=$this->check_is_import_file($path.$filename);
                            if($res['result'] =='success'){
                                @wp_delete_file($path.$filename);
                            }
                        }
                    }
                }
            }
        }

        $data = array();
        WPvivid_Setting::update_option('wpvivid_import_list_cache', $data);
        $page=1;
        $display_list=new WPvivid_Export_List();
        $display_list->set_parent('wpvivid_import_list');
        $display_list->set_list($data, $page);
        $display_list->prepare_items();
        ob_start();
        $display_list->display();
        $html = ob_get_clean();
        $ret['html']=$html;
        $ret['data']=$data;
        $ret['result']=WPVIVID_SUCCESS;

        global $wpvivid_plugin;
        $bytes_total = 0;
        $path = realpath($path);
        if($path!==false && $path!='' && file_exists($path))
        {
            foreach(new RecursiveIteratorIterator(new RecursiveDirectoryIterator($path, FilesystemIterator::SKIP_DOTS)) as $object)
            {
                $bytes_total += $object->getSize();
            }
        }
        $ret['size'] = $wpvivid_plugin->formatBytes($bytes_total);

        echo wp_json_encode($ret);
        die();
    }

    public function wpvivid_scan_import_folder()
    {
        check_ajax_referer( 'wpvivid_ajax', 'nonce' );
        $check=current_user_can('manage_options');
        $check=apply_filters('wpvivid_ajax_check_security',$check);
        if(!$check)
        {
            die();
        }

        $path=WP_CONTENT_DIR.DIRECTORY_SEPARATOR.WPvivid_Setting::get_backupdir().DIRECTORY_SEPARATOR.WPVIVID_IMPORT_EXPORT_DIR.DIRECTORY_SEPARATOR;

        $data=array();
        $count = 0;
        if(is_dir($path))
        {
            $handler = opendir($path);
            if($handler!==false)
            {
                while (($filename = readdir($handler)) !== false)
                {
                    if ($filename != "." && $filename != "..")
                    {
                        $count++;

                        if (is_dir($path  . $filename))
                        {
                            continue;
                        }
                        else {

                            $res=$this->check_is_import_file($path.$filename);
                            if($res['result'] =='success')
                            {
                                $add_file['file_name']=$filename;
                                $add_file['size']=filesize($path.$filename);
                                $add_file['export_type']=$res['export_type'];
                                $add_file['export_comment']=$res['export_comment'];
                                $add_file['posts_count']=$res['posts_count'];
                                $add_file['media_size']=size_format($res['media_size'],2);
                                $add_file['time']=$res['time'];
                                $data[$this->get_file_id($filename)]=$add_file;
                            }
                        }
                    }
                }
                if($handler)
                    @closedir($handler);
            }
        }
        else{
            global $wpvivid_plugin;
            $wpvivid_plugin->wpvivid_log=new WPvivid_Log();
            $id=uniqid('wpvivid-');
            $wpvivid_plugin->wpvivid_log->CreateLogFile($id.'_scan','no_folder','scan');
            $wpvivid_plugin->wpvivid_log->WriteLogHander();
            $wpvivid_plugin->wpvivid_log->WriteLog('Failed to get local storage directory.','notice');
            $ret['result']=WPVIVID_FAILED;
            $ret['error']='Failed to get local storage directory.';
        }
        WPvivid_Setting::update_option('wpvivid_import_list_cache', $data);
        $page=1;
        $display_list=new WPvivid_Export_List();
        $display_list->set_parent('wpvivid_import_list');
        $display_list->set_list($data, $page);
        $display_list->prepare_items();
        ob_start();
        $display_list->display();
        $html = ob_get_clean();
        $ret['html']=$html;
        $ret['data']=$data;
        $ret['result']=WPVIVID_SUCCESS;
        echo wp_json_encode($ret);
        die();
    }

    public function get_import_list_page(){
        check_ajax_referer( 'wpvivid_ajax', 'nonce' );
        $check=current_user_can('manage_options');
        $check=apply_filters('wpvivid_ajax_check_security',$check);
        if(!$check)
        {
            die();
        }
        if(!isset($_POST['page']))
        {
            die();
        }
        $page=sanitize_key($_POST['page']);

        $backups = get_option('wpvivid_import_list_cache');

        $display_list=new WPvivid_Export_List();
        $display_list->set_parent('wpvivid_import_list');
        $display_list->set_list($backups, $page);
        $display_list->prepare_items();
        ob_start();
        $display_list->display();
        $html = ob_get_clean();

        $ret['result']='success';
        $ret['rows']=$html;
        echo wp_json_encode($ret);
        die();
    }

    public function deal_import_shutdown_error()
    {
        if($this->end_shutdown_function===false){
            $last_error = error_get_last();
            if (!empty($last_error) && !in_array($last_error['type'], array(E_NOTICE,E_WARNING,E_USER_NOTICE,E_USER_WARNING,E_DEPRECATED), true)) {
                $error = $last_error;
            } else {
                $error = false;
            }
            $ret['result'] = 'failed';
            if ($error === false) {
                $ret['error'] = 'unknown Error';
            } else {
                $ret['error'] = 'type: '. $error['type'] . ', ' . $error['message'] . ' file:' . $error['file'] . ' line:' . $error['line'];
                error_log($ret['error']);
            }
            $id = uniqid('wpvivid-');
            $log_file_name = $id . '_import';
            $log = new WPvivid_Log();
            $log->CreateLogFile($log_file_name, 'no_folder', 'import');
            $log->WriteLog($ret['error'], 'notice');
            $log->CloseFile();
            WPvivid_error_log::create_error_log($log->log_file);
            echo wp_json_encode($ret);
            die();
        }
    }

    private function flush($task_id)
    {
        $ret['result']='success';
        $ret['task_id']=$task_id;
        $json=wp_json_encode($ret);
        if(!headers_sent())
        {
            header('Content-Length: '.strlen($json));
            header('Connection: close');
            header('Content-Encoding: none');
        }


        if (session_id())
            session_write_close();
        echo wp_json_encode($ret);

        if(function_exists('fastcgi_finish_request'))
        {
            fastcgi_finish_request();
        }
        else
        {
            ob_flush();
            flush();
        }
    }

    public function start_import()
    {
        global $wpvivid_plugin;
        check_ajax_referer( 'wpvivid_ajax', 'nonce' );
        $check=current_user_can('manage_options');
        $check=apply_filters('wpvivid_ajax_check_security',$check);
        if(!$check)
        {
            die();
        }
        $this->end_shutdown_function = false;
        register_shutdown_function(array($this,'deal_import_shutdown_error'));
        try
        {
            $file_name=sanitize_text_field($_POST['file_name']);
            if (isset($file_name) && !empty($file_name) && is_string($file_name))
            {
                $files=array();
                $options=array();
                $files[]=$file_name;
                $options['user']=0;
                if(isset($_POST['user']))
                {
                    $options['user']=sanitize_text_field($_POST['user']);
                }
                $options['update_exist']=0;
                if(isset($_POST['update_exist']))
                {
                    $options['update_exist']=sanitize_text_field($_POST['update_exist']);
                }

                $task_id=$this->get_file_id($file_name);
                WPvivid_Impoter_taskmanager::new_task($task_id, $files,$options);
                $import_log = new WPvivid_import_data();
                $import_log->wpvivid_create_import_log();
                $import_log->wpvivid_write_import_log('Start importing', 'notice');
                $this->flush($task_id);
                WPvivid_Impoter_taskmanager::update_import_task_status($task_id, 'running', true);
                $importer = new WPvivid_media_importer();
                $ret = $importer->import($task_id);
                echo wp_json_encode($ret);
            }
        }
        catch (Exception $error)
        {
            $message = 'An error has occurred. class:'.get_class($error).';msg:'.$error->getMessage().';code:'.$error->getCode().';line:'.$error->getLine().';in_file:'.$error->getFile().';';
            error_log($message);
            WPvivid_Exporter_taskmanager::update_backup_task_status($task_id,false,'error',false,false,$message);
            $wpvivid_plugin->wpvivid_log->WriteLog($message,'error');
            $this->end_shutdown_function=true;
            die();
        }
        $this->end_shutdown_function=true;
        die();
    }

    public function get_file_id($file_name)
    {
        if(preg_match('/wpvivid-.*_.*_to_.*\.zip$/',$file_name))
        {
            if(preg_match('/wpvivid-(.*?)_/',$file_name,$matches))
            {
                $id= $matches[0];
                $id=substr($id,0,strlen($id)-1);
                return $id;
            }
            else
            {
                $id=uniqid('wpvivid-');
                return $id;
            }
        }
        else
        {
            $id=uniqid('wpvivid-');
            return $id;
        }
    }
}