/**
  * Attached to activate_{ plugin_basename( __FILES__ ) } by register_activation_hook()
  * @static
  */
 public static function plugin_activation()
 {
     if (version_compare($GLOBALS['wp_version'], ANVITA_ENQUIRY_MINIMUM_WP_VERSION, '<')) {
         load_plugin_textdomain('anvita-enquiry-form');
         $message = '<strong>' . sprintf(esc_html__('Anvita Enquiry Form %s requires WordPress %s or higher.', 'anvita-enquiry-form'), ANVITA_ENQUIRY_VERSION, ANVITA_ENQUIRY_MINIMUM_WP_VERSION) . '</strong> ' . sprintf(__('Please <a href="%1$s">upgrade WordPress</a> to a current version', 'anvita-enquiry-form'), 'https://codex.wordpress.org/Upgrading_WordPress', '');
         Enquiry::bail_on_activation($message);
     } else {
         global $wpdb;
         $enquiry = get_option("anv_setting");
         $enquiry = json_decode($enquiry, true);
         if ($enquiry == NULL) {
             $enquiry = self::$plugin_options;
         }
         $oldopt = get_option('jal_db_version');
         if ($oldopt != NULL) {
             $enquiry['to'] = get_option('anvitaenq_to');
             $enquiry['crm'] = get_option('anvitaenq_crmid');
             $enquiry['phone'] = get_option('anvitaenq_phoneno');
         }
         $enqtable = self::enquirytable();
         $sql = "CREATE TABLE " . $enqtable . " (\n\t\t\t\t`enqid` MEDIUMINT(9) NOT NULL AUTO_INCREMENT,\n\t\t\t\t`time` DATETIME NOT NULL DEFAULT '0000-00-00 00:00:00',\n\t\t\t\t`name` TINYTEXT NOT NULL,\n\t\t\t\t`email` TINYTEXT NOT NULL,\n\t\t\t\t`country` TINYTEXT NOT NULL,\n\t\t\t\t`city` TINYTEXT NOT NULL,\n\t\t\t\t`ip` VARCHAR(20) NOT NULL,\n\t\t\t\t`mobile` VARCHAR(20) NULL DEFAULT NULL,\n\t\t\t\t`phone` VARCHAR(20) NULL DEFAULT NULL,\n\t\t\t\t`msg` MEDIUMTEXT NOT NULL,\n\t\t\t\t`age` TINYINT(4) NULL DEFAULT NULL,\n\t\t\t\t`address` VARCHAR(200) NULL DEFAULT NULL,\n\t\t\t\t`attachment` VARCHAR(1000) NULL DEFAULT NULL,\n\t\t\t\t`isdeleted` INT(2) NOT NULL DEFAULT '0',\n\t\t\t\tUNIQUE INDEX `id` (`enqid`)) " . $wpdb->get_charset_collate();
         require_once ABSPATH . 'wp-admin/includes/upgrade.php';
         dbDelta($sql);
         $enquiry['ver'] = ANVITA_ENQUIRY_VERSION;
         $enquiry = json_encode($enquiry);
         update_option("anv_setting", $enquiry);
     }
 }