<?php

class stTax
{
    const SESSION_NAMESPACE = 'soteshop/stTaxPlugin';

    protected static $activeCached = null;

    protected static $requiredCountriesIds = null;

    /**
     * Lista krajów dla VAT UE Konsumenta
     *
     * @var Countries[]
     */
    protected static $countriesForConsumerEuRates = null;

    /**
     * Zwraca stawkę VAT po ID
     *
     * @param int $id
     * @return Tax
     */
    public static function getById($id)
    {
        $taxes = self::get();

        return isset($taxes[$id]) ? $taxes[$id] : null;
    }

    /**
     * Zwraca czy VAT UE dla konsumentów jest włączony
     *
     * @return  bool
     */ 
    public static function getIsCustomerEuTaxEnabled($checkConfigOnly = false)
    {
        $config = stConfig::getInstance('stTaxBackend');

        $isCustomerEuTaxEnabled = sfContext::getInstance()->getUser()->getAttribute('is_customer_eu_tax_enabled', true, self::SESSION_NAMESPACE);

        return $config->get('is_customer_eu_tax_enabled') && ($isCustomerEuTaxEnabled || $checkConfigOnly);
    }

    /**
     * Ustawia czy VAT UE dla konsumentów jest włączony
     *
     * @param  bool  $isCustomerEuTaxEnabled  Czy VAT UE dla konsumentów jest włączony
     */ 
    public static function setIsCustomerEuTaxEnabled($isCustomerEuTaxEnabled)
    {
        sfContext::getInstance()->getUser()->setAttribute('is_customer_eu_tax_enabled', $isCustomerEuTaxEnabled, self::SESSION_NAMESPACE);
    }

    /**
     * Zwraca stawkę VAT po wartości
     *
     * @param string $value
     * @return Tax
     */
    public static function getByValue($value)
    {
        $value = stPrice::round($value);
        
        $results = self::fetchCached();

        $rates = $results['rates'];

        return isset($rates[$value]) ? $results['active'][$rates[$value]] : null;
    }

    /**
     * Zwraca listę aktywnych stawek VAT
     *
     * @return Tax[]
     */
    public static function get()
    {
        $results = self::fetchCached();

        return $results['active'];
    }

    /**
     * Zwraca domyślną stawkę VAT
     *
     * @return void
     */
    public static function getDefault()
    {
        $results = self::fetchCached();

        return $results['default'] ? $results['active'][$results['default']] : null;
    }

    public static function hasEx($country_id = null)
    {
        /**
         * @var stBasket
         */
        $basket = sfContext::getInstance()->getUser()->getBasket();

        /**
         * @var Countries
         */
        $country = stDeliveryFrontend::getInstance($basket)->getDefaultDeliveryCountry();

        return null !== self::getEx() && $country && !$country->isEU() && (null === $country_id || !CountriesPeer::retrieveByPK($country_id)->isEU());
    }

    /**
     * Zwraca stawkę EX
     *
     * @return Tax
     */
    public static function getEx()
    {
        $results = self::fetchCached();

        return $results['ex'] && isset($results['active'][$results['ex']]) ? $results['active'][$results['ex']] : null;
    }

    /**
     * Zwraca stawkę EU
     *
     * @return Tax
     */
    public static function getEu()
    {
        $results = self::fetchCached();

        return $results['eu'] && isset($results['active'][$results['eu']]) ? $results['active'][$results['eu']] : null;
    }

    public static function fetchCached()
    {
        if (null === self::$activeCached)
        {
            $cache = new stFunctionCache('stTax');
            self::$activeCached = $cache->cacheCall(array('stTax', 'fetch'));
        }

        return self::$activeCached;
    }

    public static function fetch()
    {
        $c = new Criteria();
        $c->add(TaxPeer::IS_ACTIVE, true);

        $rs = TaxPeer::doSelectRS($c);

        $results = array();
        $rates = array();
        $default = null;
        $ex = null;
        $eu = null;

        while ($rs->next())
        {
            $tax = new Tax();
            $tax->hydrate($rs);
            $results[$tax->getId()] = $tax;
            
            if (!in_array($tax->getVatName(), ['ex', 'ue', 'zw']))
            {
                $rates[stPrice::round($tax->getVat())] = $tax->getId();
            }

            if ($tax->getIsDefault())
            {
                $default = $tax->getId();
            }

            if ($tax->getVatName() == 'ex')
            {
                $ex = $tax->getId();
            }

            if ($tax->getVatName() == 'ue')
            {
                $eu = $tax->getId();
            }
        }

        return array('active' => $results, 'default' => $default, 'rates' => $rates, 'ex' => $ex, 'eu' => $eu);
    }


    public static function getEUTaxRates()
    {
        return sfConfig::get('app_st_tax_rates', array());
    }

    /**
     * Zwraca listę krajów dla VAT UE Konsumenta
     * 
     * @return Countries[] 
     * @throws PropelException 
     */
    public static function getCountriesForConsumerEuRates()
    {
        if (null === self::$countriesForConsumerEuRates)
        {
            $rates = self::getEUTaxRates();

            $countryCodes = array_keys($rates);

            $c = new Criteria();
            $c->add(CountriesPeer::ISO_A2, $countryCodes, Criteria::IN);
            $c->addAscendingOrderByColumn(CountriesPeer::OPT_NAME);

            CountriesPeer::setHydrateMethod(function (ResultSet $rs)
            {
                $results = array();

                $rs->setFetchmode(ResultSet::FETCHMODE_NUM);

                while ($rs->next())
                {
                    $country = new Countries();
                    $country->hydrate($rs);
                    $results[$country->getIsoA2()] = $country;
                }

                return $results;
            });

            self::$countriesForConsumerEuRates = CountriesPeer::doSelect($c);
        }

        return self::$countriesForConsumerEuRates;
    }

    /**
     * Zwraca listę kodów krajów wymaganych
     *
     * @return array
     */
    public static function getRequiredCountriesCodes()
    {
        if (null === self::$requiredCountriesIds)
        {
            $config = stConfig::getInstance('stShopInfoBackend');
            $ids = array();

            foreach (self::getCountriesForConsumerEuRates() as $country)
            {
                $ids[] = $country->getId();
            }

            $c = new Criteria();
            $c->addSelectColumn(CountriesPeer::ID);
            $c->addSelectColumn(CountriesPeer::ISO_A2);
            $c->add(CountriesPeer::ID, $ids, Criteria::IN);
            $c->addJoin(CountriesPeer::ID, CountriesAreaHasCountriesPeer::COUNTRIES_ID);
            $c->addJoin(CountriesAreaHasCountriesPeer::COUNTRIES_AREA_ID, CountriesAreaPeer::ID);
            $c->addJoin(CountriesAreaPeer::ID, DeliveryPeer::COUNTRIES_AREA_ID);
            $c->add(DeliveryPeer::ACTIVE, true);
            $c->addGroupByColumn(CountriesPeer::ID);

            CountriesPeer::setHydrateMethod(function (ResultSet $rs) use ($config)
            {
                $results = array();

                while ($rs->next())
                {
                    $id = $rs->getInt(1);
                    $code = $rs->getString(2);

                    if ($config->get('country') != $code)
                    {
                        $results[$id] = $code;
                    }
                }

                return $results;
            });

          
            self::$requiredCountriesIds = CountriesPeer::doSelect($c);
        }

        return self::$requiredCountriesIds;
    }

    public static function checkRequiredCountriesTaxRateConfiguration(array $countryCodes, array &$errors = null)
    {
        $errors = array();

        $requiredCodes = self::getEUTaxRates();

        $config = stConfig::getInstance('stShopInfoBackend');

        foreach (TaxPeer::doSelectActive() as $tax)
        {
            if ($tax->isSystemDefault())
            {
                continue;
            }

            $rates = $tax->getRatesByCountry();

            foreach ($countryCodes as $code)
            {
                if ($config->get('country') == $code) 
                {
                    continue;
                }

                if (isset($requiredCodes[$code]) && (!$rates || !isset($rates[$code]) || $rates[$code] === ""))
                {
                    $errors[$code][$tax->getId()] = $tax;
                }
            }
        }

        return empty($errors);
    }
}