<?php

declare(strict_types=1);

class Int_VGT extends IPSModule
{
    public function Create()
    {
        parent::Create();

        $this->RegisterPropertyString("DeviceID", "");
    }

    public function ApplyChanges()
    {
        parent::ApplyChanges();

        // MQTT Server als Parent verbinden
        $this->ConnectParent("{7F8A48DD-F8AD-4F9C-8E6B-9E4D92DDB8F9}");

        if ($this->ReadPropertyString("DeviceID") == "") {
            $this->SetStatus(104); // config error
        } else {
            $this->SetStatus(102); // OK
        }
    }

    /**
     * Required when using RequestAction
     */
    public function RequestAction($Ident, $Value)
    {
        // Im Moment haben wir keine Action-Variablen
        // Wird aber von Symcon benötigt → also leer implementiert
        return;
    }

    /**
     * Wird vom MQTT Server aufgerufen wenn Daten ankommen
     */
    public function ReceiveData(string $JSONString)
    {
        $buffer = json_decode($JSONString, true);
        if ($buffer === null) {
            IPS_LogMessage("Int_VGT", "Invalid JSON received.");
            return;
        }

        if (!isset($buffer['Topic']) || !isset($buffer['Payload'])) {
            IPS_LogMessage("Int_VGT", "Missing keys in buffer.");
            return;
        }

        $topic = $buffer['Topic'];
        $payload = $buffer['Payload'];

        IPS_LogMessage("Int_VGT", "MQTT RX: {$topic} → {$payload}");

        $this->HandleIncoming($topic, $payload);
    }

    /**
     * Verarbeitet eingehende MQTT-Nachrichten
     */
    private function HandleIncoming(string $topic, string $payload)
    {
        $deviceID = $this->ReadPropertyString("DeviceID");

        if ($deviceID == "") {
            return; // no config
        }

        // 1) Feedback Request
        if ($topic === "feedback-request/{$deviceID}") {

            $response = json_encode([
                "status" => "ok",
                "timestamp" => time()
            ]);

            $this->Publish("feedback-response/{$deviceID}", $response);
            return;
        }

        // 2) Remote Control Echo
        if ($topic === "remote-control-response/{$deviceID}") {

            $this->Publish("remote-control-feedback/{$deviceID}", $payload);
            return;
        }
    }

    /**
     * Publisht MQTT-Daten über das Gateway
     */
    private function Publish(string $topic, string $payload)
    {
        $data = [
            "DataID" => "{7F8A48DD-F8AD-4F9C-8E6B-9E4D92DDB8F9}",
            "Packet" => [
                "Topic"   => $topic,
                "Payload" => $payload,
                "QoS"     => 0,
                "Retain"  => false
            ]
        ];

        IPS_LogMessage("Int_VGT", "MQTT TX: $topic → $payload");

        $this->SendDataToParent(json_encode($data));
    }
}

?>