<?php

declare(strict_types=1);

class Int_VGT extends IPSModule
{
    public function Create()
    {
        parent::Create();
        $this->RegisterPropertyString("DeviceID", "");
    }

    public function ApplyChanges()
    {
        parent::ApplyChanges();
        // Verbindung zur ausgewählten Gateway-Instanz
        $this->ConnectParent("{7F8A48DD-F8AD-4F9C-8E6B-9E4D92DDB8F9}");
        $deviceID = $this->ReadPropertyString("DeviceID");

        if ($deviceID === "") {
            $this->SetStatus(104);
        } else {
            $this->SetStatus(102);
        }
    }

    public function ReceiveData(string $JSONString)
    {
        $data = json_decode($JSONString, true);
        if ($data === null) {
            return;
        }
        if (!isset($data["Topic"]) || !isset($data["Payload"])) {
            return;
        }

        $topic = $data["Topic"];
        $payload = $data["Payload"];

        IPS_LogMessage("Int_VGT", "Received topic: {$topic}, payload: {$payload}");
        $this->HandleIncoming($topic, $payload);
    }

    private function HandleIncoming(string $topic, string $payload)
    {
        $deviceID = $this->ReadPropertyString("DeviceID");

        if ($topic === "feedback-request/{$deviceID}") {
            $response = json_encode([
                "status" => "ok",
                "timestamp" => time()
            ]);
            $this->Publish("feedback-response/{$deviceID}", $response);
            return;
        }

        if ($topic === "remote-control-response/{$deviceID}") {
            // Echo same payload
            $this->Publish("remote-control-feedback/{$deviceID}", $payload);
            return;
        }
    }

    private function Publish(string $topic, string $payload)
    {
        $message = [
            "Topic"   => $topic,
            "Payload" => $payload,
            "Retain"  => false,
            "QoS"     => 0
        ];
        $data = [
            "DataID" => "{7F8A48DD-F8AD-4F9C-8E6B-9E4D92DDB8F9}",
            "Packet" => $message
        ];
        $this->SendDataToParent(json_encode($data));
    }
}
?>