yf_manage_shop_invoice admin module

    public function invoice()
    {
        $id = (int) ($_GET['id'] ?? null);
        $_GET['id'] = $id;
        list($css, $html) = $this->_prepare_invoice_body($id);
        $tpl = db()->get_one('SELECT text FROM ' . db('static_pages') . ' WHERE `name`= "invoice"');
        if (empty($tpl)) {
            $tpl = '
<!DOCTYPE html>
<html>
<head>
	<meta charset="UTF-8">
</head>
<body>

__INVOICE__

</body>
</html>
';
        }
        if (($_GET['pdf'] ?? null)) {
            $html_page = str_replace('__INVOICE__', $html, $tpl);
            common()->pdf_page([
                'css' => $css,
                'html' => $html_page,
                'file' => $id,
            ]);
        } else {
            $body = sprintf(
                '<style>%s</style>%s',
                $css,
                $html
            );
            $body = str_replace('__INVOICE__', $body, $tpl);
            echo $body;
        }
        exit;
    }

    public function _init()
    {
        $this->_class_price = _class('_shop_price', 'modules/shop/');
        $this->_class_units = _class('_shop_product_units', 'modules/shop/');
        $this->_class_region = _class('_shop_region', 'modules/shop/');
        $this->_class_categories = _class('_shop_categories', 'modules/shop/');
        $this->_class_basket = _class('shop_basket', 'modules/shop/');
        $this->_class_shop = module('shop');
    }

    public function _prepare_invoice_body($order_id = false)
    {
        $_class_price = $this->_class_price;
        $_class_units = $this->_class_units;
        $_class_region = $this->_class_region;
        $_class_categories = $this->_class_categories;
        $_class_basket = $this->_class_basket;
        $_class_shop = $this->_class_shop;
        if ($order_id) {
            $order_info = db()->query_fetch('SELECT * FROM ' . db('shop_orders') . ' WHERE id=' . (int) $order_id);
        }
        if (empty($order_info)) {
            return _e('No such order');
        }
        $id = (int) $order_info['id'];
        $Q = db_get_all('SELECT * FROM ' . db('shop_order_items') . ' WHERE order_id=' . $id);

        // Get products from db
        $products_ids = [];
        // type: 0 - product; 1 - product set
        foreach ((array) $Q as $_id => $item) {
            $type = (int) $item['type'];
            $product_id = (int) $item['product_id'];
            if ($product_id) {
                $products_ids[$type][$product_id] = $product_id;
            }
        }
        $infos = [];
        $products_units = null;
        if ( ! empty($products_ids[0])) {
            $ids = array_keys($products_ids[0]);
            $ids_sql = implode(',', $ids);
            $infos[0] = db()->query_fetch_all('SELECT * FROM ' . db('shop_products') . ' WHERE id IN(' . $ids_sql . ')');
            $_class_units = $this->_class_units;
            $products_units = $_class_units->get_by_product_ids($ids);
        }
        if ( ! empty($products_ids[1])) {
            $ids = array_keys($products_ids[1]);
            $ids_sql = implode(',', $ids);
            $infos[1] = db()->query_fetch_all('SELECT * FROM ' . db('shop_product_sets') . ' WHERE id IN(' . $ids_sql . ')');
        }

        $price_total = 0;
        $out = null;
        foreach ((array) $Q as $item) {
            $param_id = (int) $item['param_id'];
            $product_id = (int) $item['product_id'];
            $type = (int) $item['type'];
            $quantity = (int) $item['quantity'];
            $unit = (int) $item['unit'];
            $info = &$infos[$type][$product_id];
            $units = $unit > 0 ? $products_units[$product_id] : 0;
            // price
            $price_one = $_class_basket->_get_price_one($item);
            $price_item = $price_one * $quantity;
            $out['products'][] = [
                'product_name' => _prepare_html($info['name']),
                'product_units' => ($units[$unit]['title'] ?? null) ?: $this->default_unit,
                'product_price_one' => $_class_shop->_format_price($price_one),
                'product_quantity' => $quantity,
                'product_item_price' => $_class_shop->_format_price($price_item),
            ];
            $price_total += $price_item;
        }
        $user_address = [];
        foreach ((array) $order_info as $k => $v) {
            if (in_array($k, $this->order_address_fields) && ! empty($v)) {
                $user_address[] = t($k) . ': ' . $v;
            }
        }
        // discount
        $discount = $order_info['discount'];
        $discount_add = $order_info['discount_add'];
        $_discount = $discount;
        $with_discount_add = isset($_GET['with_discount_add']);
        if ($with_discount_add) {
            $_discount += $discount_add;
        }
        $discount_price = $_class_price->apply_price($price_total, $_discount);
        $discount_price -= $price_total;
        // total string
        $total_sum = (float) $order_info['total_sum'];
        $num_to_str = common()->num2str($total_sum);
        // delivery
        $_class_delivery = _class('_shop_delivery', 'modules/shop/');
        $delivery_id = (int) $order_info['delivery_id'];
        $delivery_type = (int) $order_info['delivery_type'];
        $delivery_name = $_class_delivery->_get_name_by_id($delivery_type);
        $region = $_class_region->_get_user_region();
        $replace = [
            'id' => $id,
            'total_sum' => $_class_shop->_format_price($total_sum),
            'user_address' => implode(' / ', $user_address),
//			'pay_type'		=> $_class_shop->_pay_types[$order_info['pay_type']],
            'date' => _format_date($order_info['date'], '%d.%m.%Y'),
            'products' => $out['products'],
            'region' => $region,
            'delivery' => $_class_shop->_format_price((float) ($order_info['delivery_price'])),
            'delivery_id' => $delivery_id,
            'delivery_type' => $delivery_type,
            'delivery_name' => $delivery_name,
            'delivery_location' => $order_info['delivery_location'],
            'discount' => $_class_shop->_format_price($discount_price),
            'num_to_str' => $num_to_str,
        ];
        return  [
            tpl()->parse('shop/invoice_css', $replace),
            tpl()->parse('shop/invoice_html', $replace),
        ];
    }