<?php

use Joomla\CMS\Filter\OutputFilter;
use Joomla\Registry\Registry;
use Joomla\Cms\Factory;

class CalculatorHelper
{

    protected static $_calculators = [];
    protected static $_fields = [];


    public $fields = [];

    public static function getInstance($calculatorId)
    {
        if (!isset(self::$_calculators[$calculatorId])) {
            self::$_calculators[$calculatorId] = new CalculatorHelper($calculatorId);

        }
        return self::$_calculators[$calculatorId];
    }

    public function __construct($calculatorId)
    {
        $db = Factory::getDbo();
        $db->setQuery('SELECT * FROM #__djc2_calculators WHERE id = ' . (int)$calculatorId);
        $this->calculator = $db->loadObject();
        if ($this->calculator) {
            $fieldsJson = json_decode($this->calculator->fields);
            $fields = [];
            foreach ($fieldsJson as $field) {
                $fields[OutputFilter::stringURLSafe($field->name)] = $field;
            }
            $this->fields = $fields;
        }
    }


    public function applyPattern($product, $data = [])
    {
        $pattern = $this->calculator->pattern;
        $search = ['[[price]]'];
        $replace = [$product->final_price];


        foreach ($this->fields as $fieldName => $field) {

            if (isset($data[$field->name])) {
                $search[] = '[[' . $fieldName . ']]';
                $replace[] = $data[$field->name];
            } else {
                $search[] = '[[' . $fieldName . ']]';
                $replace[] = 0;
            }
        }


        $result = 0;
        $pattern = str_replace($search, $replace, $pattern);



        try {
            eval('$result = @(' . $pattern . ');');


            return $result;
        } catch (ParseError $e) {
            $app = Factory::getApplication();
            $app->enqueueMessage(\Joomla\CMS\Language\Text::_('COM_DJCATALOG2_PARSE_CALCULATOR_PATTERN_ERROR'));
            return $product->final_price;
        }
    }

    public function parseOrderItemAttributes($attributes)
    {
        $data = [];


        foreach ($this->fields as $field) {
            if (isset($attributes[$field->name])) {

                switch ($field->type) {
                    case 'checkbox':

                        foreach ($field->options as $option) {
                            if ($option->text == $attributes[$field->name]) {
                                $data[$field->name] = $option->price;
                                break;
                            }
                        }

                        break;
                    default:
                        $data[$field->name] = $attributes[$field->name];
                        break;
                }

            }
        }
        return $data;
    }


}