<?php
/**
 * Page Cache Ultimate, Page Cache standard and Speed pack are powered by Jpresta (jpresta . com)
 *
 *    @author    Jpresta
 *    @copyright Jpresta
 *    @license   See the license of this module in file LICENSE.txt, thank you.
 */

use JPresta\SpeedPack\JprestaUtils;

if (!defined('_PS_VERSION_')) {exit;}

// Check existence of the class to be able to handle compatibility problems in a friendly way
if (!class_exists('JprestaUtilsTaxManager')) {

    class JprestaUtilsTaxManager implements TaxManagerInterface
    {
        private $tax_calculator;

        /**
         * JprestaUtilsTaxManager constructor.
         * @param string $json JSON generated by self::toJson
         * @param int $id_tax_rules_group Also known as 'type'
         * @throws Exception
         */
        public function __construct($json, $id_tax_rules_group)
        {
            $infos = json_decode($json, true);
            if (!is_array($infos)) {
                throw new PrestaShopException('Cannot parse JSON to construct a JprestaUtilsTaxManager');
            }
            if (!array_key_exists($id_tax_rules_group, $infos)) {
                $this->tax_calculator = new TaxCalculatorCore(array(), 0);
            } else {
                if (!is_array($infos[$id_tax_rules_group])
                    || !array_key_exists('taxes', $infos[$id_tax_rules_group])
                    || !array_key_exists('computation_method', $infos[$id_tax_rules_group])) {
                    throw new PrestaShopException('Error while parsing JSON to construct a JprestaUtilsTaxManager');
                }
                $infos_rule = $infos[$id_tax_rules_group];
                $taxes = [];
                foreach ($infos_rule['taxes'] as $id_tax) {
                    $tax = new Tax((int)$id_tax);
                    if ($tax) {
                        $taxes[] = $tax;
                    }
                }
                $this->tax_calculator = new TaxCalculatorCore($taxes, $infos_rule['computation_method']);
            }
        }

        public static function toPrettyString($json)
        {
            $infos = json_decode($json, true);
            if (!is_array($infos)) {
                return 'Cannot parse JSON to construct a JprestaUtilsTaxManager';
            }
            $prettyString = '';
            foreach ($infos as $id_tax_rules_group => $infos_rule) {
                $taxRulesGroup = new TaxRulesGroup($id_tax_rules_group);
                $prettyString .= '- ' . $taxRulesGroup->getFieldByLang('name') . " (#$id_tax_rules_group)\n";
                if (count($infos_rule['taxes']) > 0) {
                    $idx = 1;
                    if ($infos_rule['computation_method'] === TaxCalculatorCore::COMBINE_METHOD) {
                        $prettyString .= "    Computation method: COMBINE METHOD\n";
                    } elseif ($infos_rule['computation_method'] === TaxCalculatorCore::ONE_AFTER_ANOTHER_METHOD) {
                        $prettyString .= "    Computation method: ONE AFTER ANOTHER METHOD\n";
                    } elseif ($infos_rule['computation_method'] === 0) {
                        $prettyString .= "    Computation method: FIRST TAX ONLY\n";
                    } else {
                        $prettyString .= "    Computation method: #" . $infos_rule['computation_method'] . "\n";
                    }
                    foreach ($infos_rule['taxes'] as $id_tax) {
                        $tax = new Tax((int)$id_tax);
                        $prettyString .= "    $idx) " . $tax->getFieldByLang('name') . " (#$id_tax)\n";
                        $idx++;
                    }
                } else {
                    $prettyString .= "    (none)\n";
                }
            }
            return $prettyString;
        }

        /**
         * @param int $id_shop
         * @param Address $address
         * @return string
         */
        public static function toJson($id_shop, $address)
        {
            $infos = [];
            $sql = 'SELECT trgs.`id_tax_rules_group`
              FROM `' . _DB_PREFIX_ . 'tax_rules_group_shop` as trgs
              LEFT JOIN `' . _DB_PREFIX_ . 'tax_rules_group` as trg
              ON trgs.id_tax_rules_group=trg.id_tax_rules_group
              WHERE active=1 AND id_shop=' . (int)$id_shop;
            if (Tools::version_compare(_PS_VERSION_,'1.6.0.9','>')) {
                $sql .= ' AND deleted=0';
            }
            $rows = JprestaUtils::dbSelectRows($sql, true, false);

            $cartWasEmpty = false;
            $context = Context::getContext();
            if (empty($context->cart) && $context->cookie->id_cart) {
                // We need the cart to be initialized because usually, TaxManager uses it to check addresses
                $cart = new Cart($context->cookie->id_cart);
                $context->cart = $cart;
                $cartWasEmpty = true;
            }
            foreach ($rows as $row) {
                $id_tax_rules_group = $row['id_tax_rules_group'];
                $tax_manager = TaxManagerFactory::getManager($address, $id_tax_rules_group);
                if ($tax_manager) {
                    $tax_calculator = $tax_manager->getTaxCalculator();
                    $infos[$id_tax_rules_group] = [];
                    $infos[$id_tax_rules_group]['taxes'] = [];
                    $infos[$id_tax_rules_group]['computation_method'] = $tax_calculator->computation_method;
                    foreach ($tax_calculator->taxes as $tax) {
                        $infos[$id_tax_rules_group]['taxes']['id_tax'] = $tax->id;
                    }
                }
            }
            if ($cartWasEmpty) {
                // Restore empty cart to avoid different behavior
                $context->cart = null;
            }
            return json_encode($infos);
        }

        public static function isAvailableForThisAddress(Address $address)
        {
            return true;
        }

        public function getTaxCalculator()
        {
            return $this->tax_calculator;
        }

    }
}