<?php

class Tracking_USPS {

    /**
     *
     * @param string $code
     * @return \TrackingInfo
     * @throws TrackingException
     */
    public static function track(string $code, string $carrier = ""): TrackingInfo {
        $barcode = new TrackingBarcode($code);

        try {
            $track = new \SimpleXMLElement("<TrackFieldRequest></TrackFieldRequest>");
            $track->addAttribute('USERID', env("usps_user_id"));
            $track->addChild('Revision', '1');
            $track->addChild('ClientIp', $_SERVER['REMOTE_ADDR']);
            $track->addChild('SourceId', env("usps_source_id", "selfhosted-opensource-default-value.netsyms.net"));
            $pack = $track->addChild('TrackID');
            $pack->addAttribute('ID', $barcode->getSanitized());
            $url = 'https://secure.shippingapis.com/ShippingApi.dll?API=TrackV2&XML=' . $track->asXML();
            $xml = simplexml_load_file($url);

            if ($xml->getName() == "Error") {
                if (!empty($xml->Description)) {
                    throw new TrackingException("The USPS tracking system is having problems: \"" . trim($xml->Description) . "\"");
                }
                throw new TrackingException("The USPS tracking system is having problems. Try again later.");
            }

            if (!empty($xml->TrackInfo)) {
                $trackinfo = $xml->TrackInfo;
            }
            if (!empty($xml->TrackInfo->Error)) {
                throw new TrackingException((string) $xml->TrackInfo->Error->Description);
            }
        } catch (TrackingException $ex) {
            throw $ex;
        } catch (Exception $ex) {
            throw new TrackingException("There was a server problem. This code cannot be tracked right now.");
        }

        $info = new TrackingInfo();

        try {
            $info->setCode($trackinfo->attributes()["ID"]);
        } catch (Exception $ex) {
            throw new TrackingException("The USPS tracking system returned an invalid response. Try again later.");
        }

        $info->setCarrier("usps");
        $info->setService(new Service((string) $trackinfo->ClassofMailCode, (string) $trackinfo->Class));
//        $info->setCarrierLogo(($_SERVER['SERVER_PORT'] == 443 ? "https://" : "http://")
//                . $_SERVER['HTTP_HOST'] . env("urlbase", "/")
//                . "resources/logistics.tracking/logos/usps.png");
        $info->setCarrierAttributionText("Information provided by www.usps.com.");

        $current_status = new TrackingEntry(
                TrackingStatus::USPSEventCodeToStatus($trackinfo->TrackSummary->EventCode),
                ($trackinfo->StatusSummary ?? "Unknown") . (TrackingStatus::USPSEventCodeToStatus($trackinfo->TrackSummary->EventCode) == TrackingStatus::TRACKING_STATUS_UNKNOWN ? " " . $trackinfo->TrackSummary->EventCode : ""),
                $trackinfo->TrackSummary["EventDate"] . " " . $trackinfo->TrackSummary["EventTime"],
                null,
                TrackingStatus::isUSPSEventCodeContainerScan($trackinfo->TrackSummary->EventCode)
        );

        $current_location = new Location();
        $current_location->city = (string) $trackinfo->TrackSummary->EventCity ?? "";
        $current_location->state = (string) $trackinfo->TrackSummary->EventState ?? "";
        $current_location->zip = (string) $trackinfo->TrackSummary->EventZIPCode ?? "";
        $current_location->country = (string) $trackinfo->TrackSummary->EventCountry ?? "";
        $current_status->setLocation($current_location);

        $info->setCurrentStatus($current_status);
        // USPS doesn't put the latest entry in the history
        $info->appendHistoryEntry($current_status);

        $from = new Location();
        $from->city = (string) $trackinfo->OriginCity ?? "";
        $from->state = (string) $trackinfo->OriginState ?? "";
        $from->zip = (string) $trackinfo->OriginZip ?? "";
        $from->country = (string) $trackinfo->OriginCountryCode ?? "";

        $info->setFrom($from);

        $to = new Location();
        $to->city = (string) $trackinfo->DestinationCity ?? "";
        $to->state = (string) $trackinfo->DestinationState ?? "";
        $to->zip = (string) $trackinfo->DestinationZip ?? "";
        $to->country = (string) $trackinfo->DestinationCountryCode ?? "";

        $info->setTo($to);

        foreach ($trackinfo->TrackDetail as $history) {
            $location = new Location();
            $location->city = (string) $history->EventCity ?? "";
            $location->state = (string) $history->EventState ?? "";
            $location->zip = (string) $history->EventZIPCode ?? "";
            $location->country = (string) $history->EventCountry ?? "";
            $info->appendHistoryEntry(new TrackingEntry(
                            TrackingStatus::USPSEventCodeToStatus((string) $history->EventCode),
                            ((string) $history->Event),
                            $history->EventDate . " " . $history->EventTime,
                            $location,
                            TrackingStatus::isUSPSEventCodeContainerScan((string) $history->EventCode)));
        }

        return $info;
    }

}