<?php

declare(strict_types=1);

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

        $this->RegisterPropertyString('DeviceID', '');

        // Variable für empfangene Remote-Control-Daten
        $this->RegisterVariableString(
            'RemoteControlPayload',
            'Remote Control Payload',
            '',
            1
        );

        // Mit MQTT Server (Splitter) verbinden
        // GUID: MQTT Server (Splitter) laut Doku
        $this->ConnectParent('{C6D2AEB3-6E1F-4B2E-8E69-3A1A00246850}');
    }

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

        // Sicherheitshalber erneut verbinden
        $this->ConnectParent('{C6D2AEB3-6E1F-4B2E-8E69-3A1A00246850}');

        $device = $this->ReadPropertyString('DeviceID');
        if ($device === '') {
            $this->SendDebug('ApplyChanges', 'Kein DeviceID gesetzt – keine Subscriptions', 0);
            return;
        }

        // Topics:
        // 1) feedback-request/deviceId
        // 2) remote-control-response/deviceId

        $this->Subscribe("feedback-request/$device");
        $this->Subscribe("remote-control-response/$device");
    }

    /**
     * An MQTT-Server (Splitter) subscribe senden.
     */
    private function Subscribe(string $topic): void
    {
        $this->SendDebug('Subscribe', "Topic: $topic", 0);

        $packet = [
            'PacketType'       => 8,       // SUBSCRIBE
            'QualityOfService' => 0,
            'Retain'           => false,
            'Topic'            => $topic,
            'Payload'          => ''       // bei Subscribe leer
        ];

        $this->SendDataToParent(json_encode([
            'DataID' => '{043EA491-0325-4ADD-8FC2-A30C8EEB4D3F}' // TX zum MQTT Server
        ] + $packet));
    }

    /**
     * Publish an MQTT-Server (Splitter).
     */
    private function Publish(string $topic, string $payload): void
    {
        $this->SendDebug('Publish', "Topic: $topic Payload: $payload", 0);

        $packet = [
            'PacketType'       => 3,       // PUBLISH
            'QualityOfService' => 0,
            'Retain'           => false,
            'Topic'            => $topic,
            'Payload'          => $payload
        ];

        $this->SendDataToParent(json_encode([
            'DataID' => '{043EA491-0325-4ADD-8FC2-A30C8EEB4D3F}' // TX zum MQTT Server
        ] + $packet));
    }

    /**
     * Wird vom MQTT-Server (Splitter) aufgerufen.
     */
    public function ReceiveData($JSONString)
    {
        $this->SendDebug('ReceiveData RAW', $JSONString, 0);

        $data = json_decode($JSONString, true);
        if (!is_array($data)) {
            $this->SendDebug('ReceiveData', 'JSON decode fehlgeschlagen', 0);
            return;
        }

        // Struktur laut Doku:
        // {
        //   "DataID": "{7F7632D9-FA40-4F38-8DEA-C83CD4325A32}",
        //   "PacketType": ...,
        //   "QualityOfService": 0,
        //   "Retain": false,
        //   "Topic": "....",
        //   "Payload": "...."
        // }
        $topic   = $data['Topic']   ?? '';
        $payload = $data['Payload'] ?? '';

        $device = $this->ReadPropertyString('DeviceID');
        if ($device === '') {
            $this->SendDebug('ReceiveData', 'Keine DeviceID gesetzt, ignoriere Paket', 0);
            return;
        }

        $this->SendDebug('ReceiveData', "Topic: $topic Payload: $payload", 0);

        // 1️⃣ feedback-request/deviceId → fixe JSON-Antwort
        if ($topic === "feedback-request/$device") {
            $this->SendDebug('Logic', 'Feedback-Request erkannt', 0);

            $response = [
                'power_production' => 123,
                'is_ready'         => true,
                'is_running'       => true,
                'state_of_charge'  => 50,
                'min_soc'          => 10,
                'max_soc'          => 90
            ];

            $this->Publish("feedback-response/$device", json_encode($response));
            return;
        }

        // 2️⃣ remote-control-response/deviceId → speichern + Callback
        if ($topic === "remote-control-response/$device") {
            $this->SendDebug('Logic', 'Remote-Control-Response erkannt', 0);

            $this->SetValue('RemoteControlPayload', $payload);
            $this->HandleRemoteControl($payload);
            return;
        }

        // Optional: andere Topics debuggen
        $this->SendDebug('ReceiveData', "Unbekanntes Topic empfangen: $topic", 0);
    }

    /**
     * Hook für eigene Logik bei Remote-Control-Payload.
     */
    protected function HandleRemoteControl(string $payload): void
    {
        $this->SendDebug('HandleRemoteControl', "Payload: $payload", 0);

        // Hier kannst du später deine eigene Logik ergänzen
        // z.B. json_decode($payload, true) und darauf reagieren.
    }
}