<?php

class ICrmOrderActions
{
    protected static $MODULE_ID = 'intaro.intarocrm';
    protected static $CRM_API_HOST_OPTION = 'api_host';
    protected static $CRM_API_KEY_OPTION = 'api_key';
    protected static $CRM_ORDER_TYPES_ARR = 'order_types_arr';
    protected static $CRM_DELIVERY_TYPES_ARR = 'deliv_types_arr';
    protected static $CRM_PAYMENT_TYPES = 'pay_types_arr';
    protected static $CRM_PAYMENT_STATUSES = 'pay_statuses_arr';
    protected static $CRM_PAYMENT = 'payment_arr'; //order payment Y/N
    protected static $CRM_ORDER_LAST_ID = 'order_last_id';
    protected static $CRM_ORDER_SITES = 'sites_ids';

    /**
     * Mass order uploading, without repeating; always returns true, but writes error log
     * @return boolean
     */
    public static function uploadOrders($pSize = 50) {

        //COption::SetOptionString(self::$MODULE_ID, self::$CRM_ORDER_LAST_ID, 0); // -- for test

        if (!CModule::IncludeModule("iblock")) {
            //handle err
            self::eventLog('ICrmOrderActions::uploadOrders', 'iblock', 'module not found');
            return true;
        }

        if (!CModule::IncludeModule("sale")) {
            //handle err
            self::eventLog('ICrmOrderActions::uploadOrders', 'sale', 'module not found');
            return true;
        }

        if (!CModule::IncludeModule("catalog")) {
            //handle err
            self::eventLog('ICrmOrderActions::uploadOrders', 'catalog', 'module not found');
            return true;
        }

        $resOrders = array();
        $resCustomers = array();
        
        $lastUpOrderId = COption::GetOptionString(self::$MODULE_ID, self::$CRM_ORDER_LAST_ID, 0);
        $lastOrderId = 0;

        $dbOrder = CSaleOrder::GetList(array("ID" => "ASC"), array('>ID' => $lastUpOrderId));

        $api_host = COption::GetOptionString(self::$MODULE_ID, self::$CRM_API_HOST_OPTION, 0);
        $api_key = COption::GetOptionString(self::$MODULE_ID, self::$CRM_API_KEY_OPTION, 0);

        //saved cat params
        $optionsOrderTypes = unserialize(COption::GetOptionString(self::$MODULE_ID, self::$CRM_ORDER_TYPES_ARR, 0));
        $optionsDelivTypes = unserialize(COption::GetOptionString(self::$MODULE_ID, self::$CRM_DELIVERY_TYPES_ARR, 0));
        $optionsPayTypes = unserialize(COption::GetOptionString(self::$MODULE_ID, self::$CRM_PAYMENT_TYPES, 0));
        $optionsPayStatuses = unserialize(COption::GetOptionString(self::$MODULE_ID, self::$CRM_PAYMENT_STATUSES, 0)); // --statuses
        $optionsPayment = unserialize(COption::GetOptionString(self::$MODULE_ID, self::$CRM_PAYMENT, 0));
        $optionsSites = unserialize(COption::GetOptionString(self::$MODULE_ID, self::$CRM_ORDER_SITES, 0));

        $api = new IntaroCrm\RestApi($api_host, $api_key);

        $arParams = array(
            'optionsOrderTypes'  => $optionsOrderTypes,
            'optionsDelivTypes'  => $optionsDelivTypes,
            'optionsPayTypes'    => $optionsPayTypes,
            'optionsPayStatuses' => $optionsPayStatuses,
            'optionsPayment'     => $optionsPayment,
            'optionSites'        => $optionsSites
        );

        //packmode
		
        $orderCount = 0;

        while ($arOrder = $dbOrder->GetNext()) { // here orders by id asc
            
            if(is_array($optionsSites) && !empty($optionsSites) && !in_array($arOrder['LID'], $optionsSites))
                continue;
                
            $result = self::orderCreate($arOrder, $api, $arParams);

            if (!$result['order'] || !$result['customer'])
                 continue;
            
            $orderCount++;
                
            $resOrders[] = $result['order'];
            $resCustomers[] = $result['customer'];

            $lastOrderId = $arOrder['ID'];

            if($orderCount >= $pSize) {
                $customers = $api->customerUpload($resCustomers);
                    
            // error pushing customers
            if ($api->getStatusCode() != 201) {
                //handle err
                //self::eventLog('ICrmOrderActions::uploadOrders', 'IntaroCrm\RestApi::customerUpload', $api->getLastError());
                        
                if($api->getStatusCode() != 460) // some orders were sent
                    return false; // in pack mode return errors
                }
                    
                $orders = $api->orderUpload($resOrders);

                // error pushing orders
                if ($api->getStatusCode() != 201) {
                    //handle err
                    self::eventLog('ICrmOrderActions::uploadOrders', 'IntaroCrm\RestApi::orderUpload', $api->getLastError());

                    if($api->getStatusCode() != 460) // some orders were sent
                        return false; // in pack mode return errors
                }
                    
                if($lastOrderId)
                    COption::SetOptionString(self::$MODULE_ID, self::$CRM_ORDER_LAST_ID, $lastOrderId);

                return true; // end of pack
            }
        }
        if (!empty($resOrders)) {
            $customers = $api->customerUpload($resCustomers);
                
            // error pushing customers
            if ($api->getStatusCode() != 201) {
                //handle err
                //self::eventLog('ICrmOrderActions::uploadOrders', 'IntaroCrm\RestApi::customerUpload', $api->getLastError());

                if ($api->getStatusCode() != 460) // some orders were sent
                    return false; // in pack mode return errors
            }
                
            $orders = $api->orderUpload($resOrders);

            // error pushing orders
            if ($api->getStatusCode() != 201) {
                //handle err
                self::eventLog('ICrmOrderActions::uploadOrders', 'IntaroCrm\RestApi::orderUpload', $api->getLastError());

                if ($api->getStatusCode() != 460) // some orders were sent
                    return false; // in pack mode return errors
            }
        }
        
        if($lastOrderId)
            COption::SetOptionString(self::$MODULE_ID, self::$CRM_ORDER_LAST_ID, $lastOrderId);

        return true; //all ok!
    }
    
    /**
     * 
     * History update; doesnt work; always returns true, but writes log of errors
     * @global CUser $USER
     * @return boolean
     */
    public static function orderHistory() {
        global $USER;
        
        if(!isset($USER) || !$USER) { // for agent; to add order User
            $USER = new CUser;
            $USER->Update(1, array());
        }
        
        if (!CModule::IncludeModule("iblock")) {
            //handle err
            self::eventLog('ICrmOrderActions::orderHistory', 'iblock', 'module not found');
            return true;
        }
        
        if (!CModule::IncludeModule("sale")) {
            //handle err
            self::eventLog('ICrmOrderActions::orderHistory', 'sale', 'module not found');
            return true;
        }
        
        if (!CModule::IncludeModule("catalog")) {
            //handle err
            self::eventLog('ICrmOrderActions::orderHistory', 'catalog', 'module not found');
            return true;
        }
        
        $api_host = COption::GetOptionString(self::$MODULE_ID, self::$CRM_API_HOST_OPTION, 0);
        $api_key = COption::GetOptionString(self::$MODULE_ID, self::$CRM_API_KEY_OPTION, 0);

        //saved cat params (crm -> bitrix)
        $optionsOrderTypes = array_flip(unserialize(COption::GetOptionString(self::$MODULE_ID, self::$CRM_ORDER_TYPES_ARR, 0)));
        $optionsDelivTypes = array_flip(unserialize(COption::GetOptionString(self::$MODULE_ID, self::$CRM_DELIVERY_TYPES_ARR, 0)));
        $optionsPayTypes = array_flip(unserialize(COption::GetOptionString(self::$MODULE_ID, self::$CRM_PAYMENT_TYPES, 0)));
        $optionsPayStatuses = array_flip(unserialize(COption::GetOptionString(self::$MODULE_ID, self::$CRM_PAYMENT_STATUSES, 0))); // --statuses
        $optionsPayment = array_flip(unserialize(COption::GetOptionString(self::$MODULE_ID, self::$CRM_PAYMENT, 0)));
        $optionsSites = unserialize(COption::GetOptionString(self::$MODULE_ID, self::$CRM_ORDER_SITES, 0));

        $api = new IntaroCrm\RestApi($api_host, $api_key);
        
        $orderHistory = $api->orderHistory();
        
        // pushing existing orders
        foreach ($orderHistory as $order) {
            var_dump($order);
            continue;
            
            if(!isset($order['externalId']) && !$order['externalId']) {
                            
                continue;

                // new order
               /*array(
                    'LID'              => SITE_ID, //<----!
                    'PERSON_TYPE_ID'   => 1, // <------!
                    'PAYED'            => 'N',
                    'CANCELED'         => 'N',
                    'STATUS_ID'        => 'N',
                    'PRICE'            => 0,
                    'CURRENCY'         => 'RUB',
                    'USER_ID'          => IntVal($USER->GetID()), // <--------!
                    'PAY_SYSTEM_ID'    => 0,
                    'PRICE_DELIVERY'   => 0,
                    'DELIVERY_ID'      => 0,
                    'DISCOUNT_VALUE'   => 0,
                    'USER_DESCRIPTION' => ''
                );
                
                $order['externalId'] = CSaleOrder::Add(array());
                
                $api->orderFixExternalIds(array($order['id'], $order['externalId']));
                
                if ($api->getStatusCode() != 200) { 
                    //handle err - write log & continue
                    self::eventLog('ICrmOrderActions::orderHistory', 'IntaroCrm\RestApi::orderFixExternalIds', $api->getLastError());
                    continue;
                } 
                
                */
            }
            
            if(isset($order['externalId']) && $order['externalId']) { 
                $arFields = CSaleOrder::GetById($order['externalId']);
                
                var_dump($arFields);
                
                // incorrect order
                if(!$arFields || empty($arFields))
                    continue;
                
                $userId = $arFields['USER_ID'];
                $LID = $arFields['LID'];
                
                $rsOrderProps = CSaleOrderPropsValue::GetList(array(), array('ORDER_ID' => $arFields['ID']));
                while ($ar = $rsOrderProps->Fetch()) {
                    if (isset($order['deliveryAddress']) && $order['deliveryAddress']) {
                        switch ($ar['CODE']) {
                            case 'ZIP': if (isset($order['deliveryAddress']['index']))
                                    CSaleOrderPropsValue::Update($ar['ID'], array('VALUE' => self::fromJSON($order['deliveryAddress']['index'])));
                                break;
                            case 'CITY': if (isset($order['deliveryAddress']['city']))
                                    CSaleOrderPropsValue::Update($ar['ID'], array('VALUE' => self::fromJSON($order['deliveryAddress']['city'])));
                                break;
                            case 'ADDRESS': if (isset($order['deliveryAddress']['text']))
                                    CSaleOrderPropsValue::Update($ar['ID'], array('VALUE' => self::fromJSON($order['deliveryAddress']['text'])));
                                break;
                            case 'LOCATION': if (isset($order['deliveryAddress']['city'])) {
                                    $cityId = self::getLocationCityId($order['deliveryAddress']['city']);
                                    if (!$cityId)
                                        break;
                                    CSaleOrderPropsValue::Update($ar['ID'], array('VALUE' => $cityId));
                                }
                                break;
                        }
                    }

                    switch ($ar['CODE']) {
                        case 'FIO':
                            if (isset($order['firstName']))
                                $contactName['firstName'] = self::fromJSON($order['firstName']);
                            if (isset($order['lastName']))
                                $contactName['lastName'] = self::fromJSON($order['lastName']);
                            if (isset($order['patronymic']))
                                $contactName['patronymic'] = self::fromJSON($order['patronymic']);

                            if (!isset($contactName) || empty($contactName))
                                break;

                            CSaleOrderPropsValue::Update($ar['ID'], array('VALUE' => implode(" ", $contactName)));
                            break;
                        case 'PHONE': if (isset($order['phone']))
                                CSaleOrderPropsValue::Update($ar['ID'], array('VALUE' => self::fromJSON($order['phone'])));
                            break;
                        case 'EMAIL': if (isset($order['email']))
                                CSaleOrderPropsValue::Update($ar['ID'], array('VALUE' => self::fromJSON($order['email'])));
                            break;
                    }
                }
                
                // here check if smth wasnt added or new propetties
                if (isset($order['deliveryAddress']) && $order['deliveryAddress']) {
                    if (isset($order['deliveryAddress']['index']))
                        self::addOrderProperty('ZIP', self::fromJSON($order['deliveryAddress']['index']), $order['externalId']);

                    if (isset($order['deliveryAddress']['city']))
                        self::addOrderProperty('CITY', self::fromJSON($order['deliveryAddress']['city']), $order['externalId']);

                    if (isset($order['deliveryAddress']['text']))
                        self::addOrderProperty('ADDRESS', self::fromJSON($order['deliveryAddress']['text']), $order['externalId']);
                }

                if (isset($order['phone']))
                    self::addOrderProperty('PHONE', self::fromJSON($order['phone']), $order['externalId']);

                if (isset($order['email']))
                    self::addOrderProperty('EMAIL', self::fromJSON($order['email']), $order['externalId']);

                if (isset($order['firstName']))
                    $contactName['firstName'] = self::fromJSON($order['firstName']);
                if (isset($order['lastName']))
                    $contactName['lastName'] = self::fromJSON($order['lastName']);
                if (isset($order['patronymic']))
                    $contactName['patronymic'] = self::fromJSON($order['patronymic']);

                if (isset($contactName) && !empty($contactName))
                    self::addOrderProperty('FIO', implode(" ", $contactName), $order['externalId']);

                /*foreach($order['items'] as $item) {                  
                    $p = CSaleBasket::GetList(
                            array('PRODUCT_ID' => 'ASC'),
                            array('ORDER_ID' => $order['externalId'], 'PRODUCT_ID' => $item['offer']['externalId']))->Fetch();
                    
                    if(!$p) // if not found
                        continue;
                    
                    // del from basket
                    if(isset($item['deleted']) && $item['deleted']) {
                        CSaleBasket::Delete($p['ID']);
                        continue;
                    }
                    
                    // change existing basket items
                    if(!isset($item['offer']) && !$item['offer']['externalId']) 
                        continue;
                    
                    $arProduct = array();
                    
                    // create new
                    if(isset($item['created']) && $item['created']) {
                        $arProduct = array(
                            'FUSER_ID'               => $userId,
                            'ORDER_ID'               => $order['externalId'],
                            'QUANTITY'               => $item['quantity'],
                            'CURRENCY'               => $p['CURRENCY'],
                            'LID'                    => $LID,
                            'PRODUCT_ID'             => $item['offer']['externalId'],
                            'PRODUCT_PRICE_ID'       => $p['PRODUCT_PRICE_ID'],
                            'WEIGHT'                 => $p['WEIGHT'],
                            'DELAY'                  => $p['DELAY'],
                            'CAN_BUY'                => $p['CAN_BUY'],
                            'MODULE'                 => $p['MODULE'],
                            'NOTES'                  => $p['NOTES'],
                            'PRODUCT_PROVIDER_CLASS' => $p['PRODUCT_PROVIDER_CLASS'],
                            'DETAIL_PAGE_URL'        => $p['DETAIL_PAGE_URL'],
                            'CATALOG_XML_ID'         => $p['CATALOG_XML_ID'],
                            'PRODUCT_XML_ID'         => $p['PRODUCT_XML_ID']
                        );

                        if (isset($item['initialPrice']) && $item['initialPrice'])
                            $arProduct['PRICE'] = (double) $item['initialPrice'];

                        if (isset($item['discount']) && $item['discount']) {
                            $arProduct['PRICE'] = $arProduct['PRICE'] - (double) $item['disount'];
                            $arProduct['DISCOUNT_PRICE'] = $item['discount'];
                        }

                        if (isset($item['discountPercent']) && $item['discountPercent']) {
                            //$arProducts['PRICE'] -- how ?
                            $arProduct['DISCOUNT_VALUE'] = $item['discountPercent'];
                        }

                        if (isset($item['offer']['name']) && $item['offer']['name'])
                            $arProduct['NAME'] = $item['offer']['name'];
                        
                        CSaleBasket::Add($arProduct);
                        continue;
                    }
                    
                    // update old
                    if(isset($item['initialPrice']) && $item['initialPrice'])
                        $arProduct['PRICE'] = (double) $item['initialPrice'];
                    
                    if(isset($item['dicount']) && $item['discount']){
                        $arProduct['PRICE'] = $arProducts['PRICE'] - (double) $item['disount'];
                        $arProduct['DISCOUNT_PRICE'] = $item['discount'];
                    }
                    
                    if(isset($item['discountPercent']) && $item['discountPercent']) {
                        //$arProducts['PRICE'] -- how ?
                        $arProduct['DISCOUNT_VALUE'] = $item['discountPercent'];
                    }
                    
                    if(isset($item['offer']['name']) && $item['offer']['name'])
                        $arProduct['NAME'] = $item['offer']['name'];
                    
                    CSaleBasket::Update($p['ID'], $arProduct);
                }*/ 
                
                // orderUpdate
                $arFields = array(
                    'PRICE_DELIVERY' => $order['deliveryCost'],
                    'PRICE'          => $order['summ'],
                    'DATE_MARKED'    => $order['markDatetime'],
                    'USER_ID'        => $order['customer'],
                    'PAY_SYSTEM_ID'  => $optionsPayTypes[$order['paymentType']],
                    'PAYED'          => $optionsPayment[$order['paymentStatus']],
                    'PERSON_TYPE_ID' => $optionsOrderTypes[$order['orderType']],
                    'DELIVERY_ID'    => $optionsDelivTypes[$order['deliveryType']],
                    'STATUS_ID'      => $optionsPayStatuses[$order['status']]
                );

                CSaleOrder::Update($order['externalId'], $arFields);
                
            } 
        } 
        
        return true;
    }

    /**
     *
     * w+ event in bitrix log
     */

    public static function eventLog($auditType, $itemId, $description) {

        CEventLog::Add(array(
            "SEVERITY"      => "SECURITY",
            "AUDIT_TYPE_ID" => $auditType,
            "MODULE_ID"     => self::$MODULE_ID,
            "ITEM_ID"       => $itemId,
            "DESCRIPTION"   => $description,
        ));
    }

    /**
     *
     * Agent function
     *
     * @return self name
     */

    public static function uploadOrdersAgent() {
        self::uploadOrders();
        return 'ICrmOrderActions::uploadOrdersAgent();';
    }
    
    /**
     * 
     * creates order or returns array of order and customer for mass upload
     * 
     * @param type $orderId
     * @param type $api
     * @param type $arParams
     * @param type $send
     * @return boolean
     * @return array - array('order' = $order, 'customer' => $customer)
     */
    public static function orderCreate($arFields, $api, $arParams, $send = false) {
        if(!$api || empty($arParams)) { // add cond to check $arParams
            return false;
        }
		
        if (empty($arFields)) {
            //handle err
            self::eventLog('ICrmOrderActions::orderCreate', 'empty($arFields)', 'incorrect order');

            return false;
        }

        $rsUser = CUser::GetByID($arFields['USER_ID']);
        $arUser = $rsUser->Fetch();

        $createdAt = new \DateTime($arUser['DATE_REGISTER']);
        $createdAt = $createdAt->format('Y-m-d H:i:s');

        // push customer (for crm)
        $firstName = self::toJSON($arUser['NAME']);
        $lastName = self::toJSON($arUser['LAST_NAME']);
        $patronymic = self::toJSON($arUser['SECOND_NAME']);

        $phonePersonal = array(
            'number' => self::toJSON($arUser['PERSONAL_PHONE']),
            'type'   => 'mobile'
        );
        $phones[] = $phonePersonal;

        $phoneWork = array(
            'number' => self::toJSON($arUser['WORK_PHONE']),
            'type'   => 'work'
        );
        $phones[] = $phoneWork;

        $customer = self::clearArr(array(
            'externalId' => $arFields['USER_ID'],
            'lastName'   => $lastName,
            'firstName'  => $firstName,
            'patronymic' => $patronymic,
            'phones'     => $phones,
            'createdAt'  => $createdAt
        ));
        
        if($send)
            $customer = $api->customerEdit($customer);

        // error pushing customer
        if (!$customer) {
            //handle err
            self::eventLog('ICrmOrderActions::orderCreate', 'IntaroCrm\RestApi::customerEdit', $api->getLastError());
            return false;
        }

        // delivery types
        $arId = array();
        if (strpos($arFields['DELIVERY_ID'], ":") !== false)
            $arId = explode(":", $arFields["DELIVERY_ID"]);

        if ($arId)
            $resultDeliveryTypeId = $arId[0];
        else
            $resultDeliveryTypeId = $arFields['DELIVERY_ID'];


        $resOrder = array();
        $resOrderDeliveryAddress = array();

        $rsOrderProps = CSaleOrderPropsValue::GetList(array(), array('ORDER_ID' => $arFields['ID']));
        while ($ar = $rsOrderProps->Fetch()) {
            switch ($ar['CODE']) {
                case 'ZIP': $resOrderDeliveryAddress['index'] = self::toJSON($ar['VALUE']);
                    break;
                case 'CITY': $resOrderDeliveryAddress['city'] = self::toJSON($ar['VALUE']);
                    break;
                case 'ADDRESS': $resOrderDeliveryAddress['text'] = self::toJSON($ar['VALUE']);
                    break;
                case 'LOCATION': if(!isset($resOrderDeliveryAddress['city']) && !$resOrderDeliveryAddress['city']) {
                        $resOrderDeliveryAddress['city'] = CSaleLocation::GetByID($ar['VALUE']);
                        $resOrderDeliveryAddress['city'] = self::toJSON($resOrderDeliveryAddress['city']['CITY_NAME_LANG']);
                    }
                    break;
                case 'FIO': $resOrder['contactName'] = explode(" ", self::toJSON($ar['VALUE']));
                    break;
                case 'PHONE': $resOrder['phone'] = $ar['VALUE'];
                    break;
                case 'EMAIL': $resOrder['email'] = $ar['VALUE'];
                    break;
            }
        }

        $items = array();

        $rsOrderBasket = CSaleBasket::GetList(array('PRODUCT_ID' => 'ASC'), array('ORDER_ID' => $arFields['ID']));
        while ($p = $rsOrderBasket->Fetch()) {
            $pr = CCatalogProduct::GetList(array('ID' => $p['PRODUCT_ID']))->Fetch();
            if ($pr)
                $pr = $pr['PURCHASING_PRICE'];
            else
                $pr = '';

            if($p['DISCOUNT_VALUE'])
                $p['DISCOUNT_PRICE'] = null;

            $items[] = array(
                'initialPrice'    => (double) $p['PRICE'] + (double) $p['DISCOUNT_PRICE'],
                'purchasePrice'   => $pr,
                'discount'        => $p['DISCOUNT_PRICE'],
                'discountPercent' => $p['DISCOUNT_VALUE'],
                'quantity'        => $p['QUANTITY'],
                'productId'       => $p['PRODUCT_ID'],
                'productName'     => self::toJSON($p['NAME'])
            );
        }

        if($arFields['CANCELED'] == 'Y')
            $arFields['STATUS_ID'] = $arFields['CANCELED'];

        $createdAt = new \DateTime($arFields['DATE_INSERT']);
        $createdAt = $createdAt->format('Y-m-d H:i:s');

        $resOrder = self::clearArr(array(
            'lastName'        => $resOrder['contactName'][0],
            'firstName'       => $resOrder['contactName'][1],
            'patronymic'      => $resOrder['contactName'][2],
            'phone'           => $resOrder['phone'],
            'email'           => $resOrder['email'],
            'deliveryCost'    => $arFields['PRICE_DELIVERY'],
            'summ'            => $arFields['PRICE'],
            'markDateTime'    => $arFields['DATE_MARKED'],
            'externalId'      => $arFields['ID'],
            'customerId'      => $arFields['USER_ID'],
            'paymentType'     => $arParams['optionsPayTypes'][$arFields['PAY_SYSTEM_ID']],
            'paymentStatus'   => $arParams['optionsPayment'][$arFields['PAYED']],
            'orderType'       => $arParams['optionsOrderTypes'][$arFields['PERSON_TYPE_ID']],
            'deliveryType'    => $arParams['optionsDelivTypes'][$resultDeliveryTypeId],
            'status'          => $arParams['optionsPayStatuses'][$arFields['STATUS_ID']],
            'statusComment'   => $arFields['REASON_CANCELED'],
            'createdAt'       => $createdAt,
            'deliveryAddress' => $resOrderDeliveryAddress,
            'items'           => $items
        ));
        
        if(isset($arParams['optionsSites']) && is_array($arParams['optionsSites'])
                && in_array($arFields['LID'], $arParams['optionsSites']))
            $resOrder['site'] = $arFields['LID'];
        
        if($send)
            $api->createOrder($resOrder);
        
        return array(
            'order'    => $resOrder,
            'customer' => $customer
        );
    }

    /**
     * removes all empty fields from arrays
     * working with nested arrs
     *
     * @param type $arr
     * @return boolean
     */
    public static function clearArr($arr) {
        if(!$arr || !is_array($arr))
            return false;

        foreach($arr as $key => $value) {
            if(!$value || (is_array($value) && empty($value)))
                unset($arr[$key]);

            if(is_array($value) && !empty($value))
                $arr[$key] = self::clearArr($value);
        }

        return $arr;
    }

    /**
     *
     * @global type $APPLICATION
     * @param type $str in SITE_CHARSET
     * @return type $str in utf-8
     */
    public static function toJSON($str) {
        global $APPLICATION;

        return $APPLICATION->ConvertCharset($str, SITE_CHARSET, 'utf-8');
    }

    /**
     *
     * @global type $APPLICATION
     * @param type $str in utf-8
     * @return type $str in SITE_CHARSET
     */
    public static function fromJSON($str) {
        global $APPLICATION;

        return $APPLICATION->ConvertCharset($str, 'utf-8', SITE_CHARSET);
    }
}