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<?php

if (!defined('ABSPATH')) {
    exit;
}
class WC_API_XML_Handler implements WC_API_Handler
{
    private $xml;
    public function __construct()
    {
        add_filter('woocommerce_api_report_response', array($this, 'format_sales_report_data'), 100);
        add_filter('woocommerce_api_product_response', array($this, 'format_product_data'), 100);
    }
    public function get_content_type()
    {
        return 'application/xml; charset=' . get_option('blog_charset');
    }
    public function parse_body($data)
    {
    }
    public function generate_response($data)
    {
        $this->xml = new XMLWriter();
        $this->xml->openMemory();
        $this->xml->setIndent(true);
        $this->xml->startDocument('1.0', 'UTF-8');
        $root_element = key($data);
        $data = $data[$root_element];
        switch ($root_element) {
            case 'orders':
                $data = array('order' => $data);
                break;
            case 'order_notes':
                $data = array('order_note' => $data);
                break;
            case 'customers':
                $data = array('customer' => $data);
                break;
            case 'coupons':
                $data = array('coupon' => $data);
                break;
            case 'products':
                $data = array('product' => $data);
                break;
            case 'product_reviews':
                $data = array('product_review' => $data);
                break;
            default:
                $data = apply_filters('woocommerce_api_xml_data', $data, $root_element);
                break;
        }
        $this->array_to_xml($root_element, $data);
        $this->xml->endDocument();
        return $this->xml->outputMemory();
    }
    private function array_to_xml($element_key, $element_value = array())
    {
        if (is_array($element_value)) {
            if ('@attributes' === $element_key) {
                foreach ($element_value as $attribute_key => $attribute_value) {
                    $this->xml->startAttribute($attribute_key);
                    $this->xml->text($attribute_value);
                    $this->xml->endAttribute();
                }
                return;
            }
            if (is_numeric(key($element_value))) {
                foreach ($element_value as $child_element_key => $child_element_value) {
                    $this->xml->startElement($element_key);
                    foreach ($child_element_value as $sibling_element_key => $sibling_element_value) {
                        $this->array_to_xml($sibling_element_key, $sibling_element_value);
                    }
                    $this->xml->endElement();
                }
            } else {
                $this->xml->startElement($element_key);
                foreach ($element_value as $child_element_key => $child_element_value) {
                    $this->array_to_xml($child_element_key, $child_element_value);
                }
                $this->xml->endElement();
            }
        } else {
            if ('@value' == $element_key) {
                $this->xml->text($element_value);
            } else {
                if (false !== strpos($element_value, '<') || false !== strpos($element_value, '>')) {
                    $this->xml->startElement($element_key);
                    $this->xml->writeCdata($element_value);
                    $this->xml->endElement();
                } else {
                    $this->xml->writeElement($element_key, $element_value);
                }
            }
            return;
        }
    }
    public function format_sales_report_data($data)
    {
        if (!empty($data['totals'])) {
            foreach ($data['totals'] as $date => $totals) {
                unset($data['totals'][$date]);
                $data['totals'][] = array_merge(array('@attributes' => array('date' => $date)), $totals);
            }
        }
        return $data;
    }
    public function format_product_data($data)
    {
        if (!empty($data['attributes'])) {
            foreach ($data['attributes'] as $attribute_key => $attribute) {
                if (!empty($attribute['options']) && is_array($attribute['options'])) {
                    foreach ($attribute['options'] as $option_key => $option) {
                        unset($data['attributes'][$attribute_key]['options'][$option_key]);
                        $data['attributes'][$attribute_key]['options']['option'][] = array($option);
                    }
                }
            }
        }
        $fields_to_fix = array('related_ids' => 'related_id', 'upsell_ids' => 'upsell_id', 'cross_sell_ids' => 'cross_sell_id', 'categories' => 'category', 'tags' => 'tag');
        foreach ($fields_to_fix as $parent_field_name => $child_field_name) {
            if (!empty($data[$parent_field_name])) {
                foreach ($data[$parent_field_name] as $field_key => $field) {
                    unset($data[$parent_field_name][$field_key]);
                    $data[$parent_field_name][$child_field_name][] = array($field);
                }
            }
        }
        if (!empty($data['parent'])) {
            if (!empty($data['parent']['attributes'])) {
                foreach ($data['parent']['attributes'] as $attribute_key => $attribute) {
                    if (!empty($attribute['options']) && is_array($attribute['options'])) {
                        foreach ($attribute['options'] as $option_key => $option) {
                            unset($data['parent']['attributes'][$attribute_key]['options'][$option_key]);
                            $data['parent']['attributes'][$attribute_key]['options']['option'][] = array($option);
                        }
                    }
                }
            }
            foreach ($fields_to_fix as $parent_field_name => $child_field_name) {
                if (!empty($data['parent'][$parent_field_name])) {
                    foreach ($data['parent'][$parent_field_name] as $field_key => $field) {
                        unset($data['parent'][$parent_field_name][$field_key]);
                        $data['parent'][$parent_field_name][$child_field_name][] = array($field);
                    }
                }
            }
        }
        return $data;
    }
}