mod.xml

<?xml version="1.0" encoding="utf-8"?>
<modification>
  <name>Google Analytics Ecommerce</name>
  <code>google-analytics-ecommerce</code>
  <version>4.0.0</version>
  <author>OpenCart Brasil</author>
  <link>http://www.opencartbrasil.com.br</link>
  <file path="catalog/model/checkout/order.php">
    <operation>
      <search><![CDATA[public function getOrder($order_id) {]]></search>
      <add position="before"><![CDATA[
        public function getGTAG($order_id) {
            $order_query = $this->db->query("SELECT o.order_id, o.store_name, o.language_id, o.currency_code, o.currency_value, o.total FROM `" . DB_PREFIX . "order` o WHERE o.order_id = '" . (int)$order_id . "'");
            if ($order_query->num_rows) {
                $language_id = $order_query->row['language_id'];
                $currency_value = $order_query->row['currency_value'];

                $order_product_query = $this->db->query("SELECT * FROM " . DB_PREFIX . "order_product WHERE order_id = '" . (int)$order_id . "'");
                foreach ($order_product_query->rows as $product) {
                    $i = 0;
                    $category_data = '';
                    $category_query = $this->db->query("SELECT cd.name FROM `" . DB_PREFIX . "product_to_category` pc INNER JOIN `" . DB_PREFIX . "category_description` cd ON pc.category_id = cd.category_id WHERE pc.product_id = '" . (int)$product['product_id'] . "' AND cd.language_id = '" . (int)$language_id . "'");
                    foreach ($category_query->rows as $category) { $i++;
                        if ($i <= 5) {
                            $category_data .= $category['name'] . '/';
                        }
                    }
                    $category_data = rtrim($category_data, '/');

                    $option_data = '';
                    $order_option_query = $this->db->query("SELECT * FROM " . DB_PREFIX . "order_option WHERE order_id = '" . (int)$order_id . "' AND order_product_id = '" . (int)$product['order_product_id'] . "'");
                    foreach ($order_option_query->rows as $option) {
                        if ($option['type'] != 'file') {
                            $option_data .= $option['name'] . ': ' . (utf8_strlen($option['value']) > 20 ? utf8_substr($option['value'], 0, 20) . '..' : $option['value']) . ' - ';
                        }
                    }
                    $option_data = rtrim($option_data, ' - ');

                    $products[] = array(
                        'id' => $product['model'],
                        'name' => $product['name'],
                        'category' => $category_data,
                        'variant' => $option_data,
                        'price' => (($product['price'] + ($this->config->get('config_tax') ? $product['tax'] : 0)) * $currency_value),
                        'quantity' => $product['quantity']
                    );
                }

                $order_shipping = 0;
                $order_total_query = $this->db->query("SELECT * FROM `" . DB_PREFIX . "order_total` WHERE order_id = '" . (int)$order_id . "' ORDER BY sort_order ASC");
                foreach ($order_total_query->rows as $total) {
                    if ($total['value'] > 0) {
                        if ($total['code'] == "shipping") {
                            $order_shipping += $total['value'];
                        }
                    }
                }

                return array(
                    'transaction_id' => $order_query->row['order_id'],
                    'affiliation' => $order_query->row['store_name'],
                    'value' => $order_query->row['total'] * $currency_value,
                    'currency' => $order_query->row['currency_code'],
                    'shipping' => $order_shipping * $currency_value,
                    'items' => $products
                );
            } else {
                return false;
            }
        }
      ]]></add>
    </operation>
  </file>
  <file path="catalog/controller/checkout/success.php">
    <operation>
      <search><![CDATA[public function index() {]]></search>
      <add position="after"><![CDATA[
        $data['gtag_event'] = '';

        if (isset($this->session->data['order_id'])) {
            if ($this->config->get('analytics_google_status')) {
                $this->load->model('checkout/order');
                $event_info = $this->model_checkout_order->getGTAG($this->session->data['order_id']);

                if ($event_info) {
                    $data['gtag_event'] .= '<script>'."\n";
                    $data['gtag_event'] .= 'gtag(\'event\', \'purchase\', {'."\n";
                    $data['gtag_event'] .= sprintf('"transaction_id": "%s", "affiliation": "%s", "value": %s, "currency": "%s", "shipping": %s,', $event_info['transaction_id'], $event_info['affiliation'], $event_info['value'], $event_info['currency'], $event_info['shipping'])."\n";
                    if (isset($event_info['items']) && is_array($event_info['items'])) {
                        $data['gtag_event'] .= '"items": [ '."\n";
                        foreach ($event_info['items'] as $item) {
                            $data['gtag_event'] .= sprintf('{ "id": "%s", "name": "%s", "category": "%s", "variant": "%s", "quantity": %s, "price": "%s" },', $item['id'], $item['name'], $item['category'], $item['variant'], $item['quantity'], $item['price'])."\n";
                        }
                        $data['gtag_event'] .= ' ]'."\n";
                    }
                    $data['gtag_event'] .= ' });'."\n";
                    $data['gtag_event'] .= '</script>';
                }
            }
        }
      ]]></add>
    </operation>
  </file>
  <file path="catalog/view/theme/*/template/common/success.twig">
    <operation>
      <search><![CDATA[{{ footer }}]]></search>
      <add position="before"><![CDATA[
{% if gtag_event %}{{ gtag_event }}{% endif %}
      ]]></add>
    </operation>
  </file>
</modification>