<?php

declare(strict_types=1);

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

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

        // MQTT CLIENT – NICHT Splitter!
        $this->ConnectParent('{C6D2AEB3-6E1F-4B2E-8E69-3A1A00246850}');

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

        // Feedback Variablen
        $this->RegisterVariableFloat('PowerProduction', 'Power Production', '', 10);
        $this->RegisterVariableFloat('StateOfCharge', 'State of Charge', '', 11);
        $this->RegisterVariableBoolean('IsRunning', 'Is Running', '', 12);
        $this->RegisterVariableBoolean('IsReady', 'Is Ready', '', 13);
        $this->RegisterVariableFloat('MinSOC', 'Min SOC', '', 14);
        $this->RegisterVariableFloat('MaxSOC', 'Max SOC', '', 15);

        // Remote Control
        $this->RegisterVariableFloat('PowerSetpoint', 'Power Setpoint', '', 20);
        $this->RegisterVariableString('Strategy', 'Strategy', '', 21);

        // Debug
        $this->RegisterVariableString('FeedbackRequestPayload', 'Feedback Request', '', 90);
        $this->RegisterVariableString('RemoteControlPayload', 'Remote Control', '', 91);
    }

    public function ApplyChanges()
    {
        parent::ApplyChanges();
        $this->ConnectParent('{C6D2AEB3-6E1F-4B2E-8E69-3A1A00246850}');
        $this->Subscribed = false;
    }

    private function Log($t, $m)
    {
        IPS_LogMessage("VGT_Sub/$t", $m);
        $this->SendDebug($t, $m, 0);
    }

    private function SafeSend(array $p)
    {
        $parent = @IPS_GetInstance($this->InstanceID)['ConnectionID'] ?? 0;
        if ($parent === 0) return;
        if (IPS_GetInstance($parent)['InstanceStatus'] !== 102) return;
        @$this->SendDataToParent(json_encode($p));
    }

    private function EnsureSubscribe()
    {
        if ($this->Subscribed) return;
        $this->Subscribed = true;

        $this->SafeSend([
            'DataID'           => '{043EA491-0325-4ADD-8FC2-A30C8EEB4D3F}',
            'PacketType'       => 8,
            'QualityOfService' => 0,
            'Retain'           => false,
            'Topic'            => '#',
            'Payload'          => ''
        ]);

        $this->Log("Subscribe", "#");
    }

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

        $this->Log("Publish", "$topic → $payload");
    }


    public function ReceiveData($JSONString)
    {
        $this->EnsureSubscribe();

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

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

        if ($topic === '') return;

        $this->Log("RX", "$topic → $payload");

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

        /* ================== FEEDBACK ================== */

        if ($topic === "feedback-request/$device") {

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

            $resp = [
                "power_production" => GetValueFloat($this->GetIDForIdent("PowerProduction")),
                "is_ready"         => GetValueBoolean($this->GetIDForIdent("IsReady")),
                "is_running"       => GetValueBoolean($this->GetIDForIdent("IsRunning")),
                "state_of_charge"  => GetValueFloat($this->GetIDForIdent("StateOfCharge")),
                "min_soc"          => GetValueFloat($this->GetIDForIdent("MinSOC")),
                "max_soc"          => GetValueFloat($this->GetIDForIdent("MaxSOC"))
            ];

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

        /* ================== REMOTE CONTROL ================== */

        if ($topic === "remote-control-request/$device") {

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

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

            if (isset($json["power_setpoint"]))
                SetValueFloat($this->GetIDForIdent("PowerSetpoint"), floatval($json["power_setpoint"]));

            if (isset($json["strategy"]))
                SetValueString($this->GetIDForIdent("Strategy"), $json["strategy"]);

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

?>