<?php

declare(strict_types=1);

class Int_VGT extends IPSModule
{
    private bool $Subscribed = false;

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

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

        /** -------------------------------------------
         *  STATUS Variablen (schreibbar)
         * ------------------------------------------*/
        $this->RegisterVariableInteger('PowerProduction', 'Power Production', '', 10);
        $this->EnableAction('PowerProduction');

        $this->RegisterVariableBoolean('IsReady', 'Is Ready', '', 11);
        $this->EnableAction('IsReady');

        $this->RegisterVariableBoolean('IsRunning', 'Is Running', '', 12);
        $this->EnableAction('IsRunning');

        $this->RegisterVariableInteger('StateOfCharge', 'State of Charge', '', 13);
        $this->EnableAction('StateOfCharge');

        $this->RegisterVariableInteger('MinSOC', 'Min SOC', '', 14);
        $this->EnableAction('MinSOC');

        $this->RegisterVariableInteger('MaxSOC', 'Max SOC', '', 15);
        $this->EnableAction('MaxSOC');

        /** -------------------------------------------
         *  REMOTE CONTROL (read-only)
         * ------------------------------------------*/
        $this->RegisterVariableInteger('PowerSetpoint', 'Power Setpoint', '', 20);
        $this->RegisterVariableString('Strategy', 'Strategy', '', 21);

        // Debug
        $this->RegisterVariableString('RemoteControlPayload', 'Remote Control Payload', '', 30);

        /** -------------------------------------------
         *  FEEDBACK REQUEST (read-only)
         * ------------------------------------------*/
        $this->RegisterVariableString('FeedbackRequestPayload', 'Feedback Request Payload', '', 40);

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

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

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

        // Beim Start niemals subscriben – erst wenn Daten fließen oder Parent aktiv wird
        $this->Subscribed = false;

        // Parent-Status überwachen für Re-Subscribe
        $this->RegisterMessage($this->InstanceID, IM_CHANGESTATUS);

        $parent = @IPS_GetInstance($this->InstanceID)['ConnectionID'] ?? 0;
        if ($parent > 0 && IPS_InstanceExists($parent)) {
            $this->RegisterMessage($parent, IM_CHANGESTATUS);
        }
    }

    /* ---------------------------------------------------------
     * MESSAGE SINK – PARENT STATUS
     * ---------------------------------------------------------*/
    public function MessageSink($TimeStamp, $SenderID, $Message, $Data)
    {
        if ($Message === IM_CHANGESTATUS) {

            // Eigene Instanz aktiv
            if ($SenderID === $this->InstanceID && ($Data[0] ?? 0) === IS_ACTIVE) {
                $this->TrySubscribe();
                return;
            }

            // Parent aktiv
            $parent = @IPS_GetInstance($this->InstanceID)['ConnectionID'] ?? 0;
            if ($parent > 0 && $SenderID === $parent && ($Data[0] ?? 0) === IS_ACTIVE) {
                $this->TrySubscribe();
                return;
            }
        }
    }

    /* ---------------------------------------------------------
     * SAFE SEND TO PARENT
     * ---------------------------------------------------------*/
    private function SafeSendToParent(array $packet)
    {
        $parent = @IPS_GetInstance($this->InstanceID)['ConnectionID'] ?? 0;
        if ($parent === 0 || !IPS_InstanceExists($parent)) {
            return;
        }

        if (IPS_GetInstance($parent)['InstanceStatus'] !== IS_ACTIVE) {
            return;
        }

        @ $this->SendDataToParent(json_encode($packet));
    }

    /* ---------------------------------------------------------
     * Subscribe erst ausführen, wenn Parent sicher aktiv ist
     * ---------------------------------------------------------*/
    private function TrySubscribe()
    {
        if ($this->Subscribed) {
            return;
        }

        $device = $this->ReadPropertyString('DeviceID');
        if ($device === '') {
            return;
        }

        $this->Subscribed = true;

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

    /* ---------------------------------------------------------
     * REQUEST ACTION
     * ---------------------------------------------------------*/
    public function RequestAction($Ident, $Value)
    {
        $this->SetValue($Ident, $Value);
    }

    /* ---------------------------------------------------------
     * SUBSCRIBE (safe)
     * ---------------------------------------------------------*/
    private function Subscribe(string $topic): void
    {
        $this->SafeSendToParent([
            'DataID'           => '{043EA491-0325-4ADD-8FC2-A30C8EEB4D3F}',
            'PacketType'       => 8,
            'QualityOfService' => 0,
            'Retain'           => false,
            'Topic'            => $topic,
            'Payload'          => ''
        ]);
    }

    /* ---------------------------------------------------------
     * PUBLISH (safe)
     * ---------------------------------------------------------*/
    private function Publish(string $topic, string $payload): void
    {
        $this->SafeSendToParent([
            'DataID'           => '{043EA491-0325-4ADD-8FC2-A30C8EEB4D3F}',
            'PacketType'       => 3,
            'QualityOfService' => 0,
            'Retain'           => false,
            'Topic'            => $topic,
            'Payload'          => $payload
        ]);
    }

    /* ---------------------------------------------------------
     * RECEIVE DATA
     * ---------------------------------------------------------*/
    public function ReceiveData($JSONString)
    {
        // Beim ersten Paket: subscriben
        $this->TrySubscribe();

        $data = json_decode($JSONString, true);
        if (!is_array($data)) return;

        $topic   = $data['Topic']   ?? '';
        $payload = $data['Payload'] ?? '';

        $device = $this->ReadPropertyString('DeviceID');

        /* ---------------------------------------------------------
         * 1️⃣ FEEDBACK REQUEST
         * ---------------------------------------------------------*/
        if ($topic === "feedback-request/$device") {

            $this->SetValue('FeedbackRequestPayload', $payload);

            $json = json_decode($payload, true);
            if (!is_array($json)) {
                $json = [];
            }

            $response = array_merge($json, [
                "power_production" => $this->GetValue('PowerProduction'),
                "is_ready"         => $this->GetValue('IsReady'),
                "is_running"       => $this->GetValue('IsRunning'),
                "state_of_charge"  => $this->GetValue('StateOfCharge'),
                "min_soc"          => $this->GetValue('MinSOC'),
                "max_soc"          => $this->GetValue('MaxSOC')
            ]);

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

        /* ---------------------------------------------------------
         * 2️⃣ REMOTE CONTROL REQUEST
         * ---------------------------------------------------------*/
        if ($topic === "remote-control-request/$device") {

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

            $json = json_decode($payload, true);
            if (is_array($json)) {

                if (array_key_exists('power_setpoint', $json)) {
                    $this->SetValue('PowerSetpoint', (int)$json['power_setpoint']);
                }

                if (array_key_exists('strategy', $json)) {
                    $this->SetValue('Strategy', (string)$json['strategy']);
                }
            }

            $this->Publish("remote-control-response/$device", $payload);
            return;
        }
    }
}

?>