<?php

namespace Modules\Core\Shipping\Carriers\Elta;

use DOMDocument;
use DOMElement;
use DOMXPath;
use Illuminate\Support\Facades\Http;
use Modules\Core\Shipping\Carriers\Elta\Exceptions\EltaApiException;

/**
 * SOAP transport for ELTA Courier's web services.
 *
 * ELTA runs two parallel operation families at the same endpoint
 * (212.205.47.226:9003). The original CREATEAWB/PELB64VG/PELTT01/PELSTATION
 * set (sourced from the unofficial chinchillabrains/eltaws reference client)
 * rejects this account's credentials with st_flag=3 ("invalid password").
 * Decompiling ELTA's own official desktop client (ELTA_PEL.exe, from their
 * public .msi installer) showed it never calls CREATEAWB at all — it
 * exclusively uses a newer "*NEW" family (PELVGNEW, PELLOGINNEW,
 * PELTTNEW01, PELTKNEW, PELVGDEL, PELPARALVGNEW1). PELVGNEW was
 * live-verified directly against the production endpoint with this same
 * account and succeeded (st_flag=0, real voucher number returned) — it
 * requires no password at all, just the account/user code pair.
 *
 * No .wsdl files exist for the *NEW family (only reconstructed from the
 * decompiled C# proxy classes' method signatures). PHP's SoapClient in
 * non-WSDL mode refuses to serialize these calls at all (SoapFault "Error
 * in client request message" regardless of style/use/SoapVar wrapping —
 * this legacy Micro Focus/CICS gateway's document/literal shape doesn't
 * match what ext-soap's non-WSDL client is willing to build), so *NEW
 * operations are sent as hand-built SOAP 1.1 envelopes over plain HTTP —
 * proven directly against the live endpoint — with the response parsed
 * back via DOMDocument/DOMXPath.
 *
 * The old family's label operation (PELB64VG) is deliberately NOT
 * exposed here — it fails with the same st_flag=3 as CREATEAWB (same
 * legacy family), and has no *NEW replacement since ELTA's own client
 * renders labels locally instead of fetching them (see
 * EltaLabelRenderer).
 */
class EltaClient
{
    public function __construct(private readonly array $config) {}

    public function login(array $params): EltaResponse
    {
        return $this->call('PELLOGINNEW', $params);
    }

    public function createVoucher(array $params): EltaResponse
    {
        return $this->call('PELVGNEW', $params);
    }

    public function listVouchers(array $params): EltaResponse
    {
        return $this->call('PELPARALVGNEW1', $params);
    }

    public function deleteVoucher(array $params): EltaResponse
    {
        return $this->call('PELVGDEL', $params);
    }

    public function getTracking(array $params): EltaResponse
    {
        return $this->call('PELTTNEW01', $params);
    }

    public function getStation(array $params): EltaResponse
    {
        return $this->call('PELTKNEW', $params);
    }

    private function call(string $operation, array $params): EltaResponse
    {
        $namespace = '/'.$operation;

        $body = '';
        foreach ($params as $key => $value) {
            $body .= '<cre:'.$key.'>'.htmlspecialchars((string) $value, ENT_XML1).'</cre:'.$key.'>';
        }

        $envelope = '<?xml version="1.0" encoding="UTF-8"?>'
            .'<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:cre="'.$namespace.'">'
            .'<soapenv:Header/><soapenv:Body><cre:READ>'.$body.'</cre:READ></soapenv:Body></soapenv:Envelope>';

        $response = Http::withHeaders([
            'SOAPAction' => 'Get',
            'Content-Type' => 'text/xml',
        ])
            ->timeout($this->config['timeout'])
            ->withBody($envelope, 'text/xml')
            ->post($this->config['service_location']);

        if ($response->failed()) {
            throw new EltaApiException('ELTA request failed: HTTP '.$response->status());
        }

        return EltaResponse::fromSoapResult($this->parseEnvelope($response->body()));
    }

    private function parseEnvelope(string $xml): array
    {
        $dom = new DOMDocument();

        if (! $dom->loadXML($xml)) {
            throw new EltaApiException('ELTA returned a response that could not be parsed as XML.');
        }

        $xpath = new DOMXPath($dom);
        $xpath->registerNamespace('soapenv', 'http://schemas.xmlsoap.org/soap/envelope/');
        $readResponse = $xpath->query('//soapenv:Body/*')->item(0);

        if (! $readResponse instanceof DOMElement) {
            throw new EltaApiException('ELTA response did not contain a SOAP body.');
        }

        return $this->nodeToArray($readResponse);
    }

    private function nodeToArray(DOMElement $element): array
    {
        $data = [];

        foreach ($element->childNodes as $child) {
            if (! $child instanceof DOMElement) {
                continue;
            }

            $name = $child->localName;
            $hasElementChildren = false;

            foreach ($child->childNodes as $grandchild) {
                if ($grandchild instanceof DOMElement) {
                    $hasElementChildren = true;
                    break;
                }
            }

            $value = $hasElementChildren ? $this->nodeToArray($child) : trim($child->textContent);

            if (array_key_exists($name, $data)) {
                if (! is_array($data[$name]) || ! array_is_list($data[$name])) {
                    $data[$name] = [$data[$name]];
                }
                $data[$name][] = $value;
            } else {
                $data[$name] = $value;
            }
        }

        return $data;
    }
}