<?php

declare(strict_types=1);

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

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

        // Status Variablen (editable)
        $this->RegisterVariableFloat('PowerProduction', 'Power Production', '', 10);
        $this->EnableAction('PowerProduction');

        $this->RegisterVariableFloat('StateOfCharge', 'State of Charge', '', 11);
        $this->EnableAction('StateOfCharge');

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

        $this->RegisterVariableBoolean('IsReady', 'Is Ready', '', 13);
        $this->EnableAction('IsReady');

        $this->RegisterVariableFloat('MinSoc', 'Min SoC', '', 14);
        $this->EnableAction('MinSoc');

        $this->RegisterVariableFloat('MaxSoc', 'Max SoC', '', 15);
        $this->EnableAction('MaxSoc');

        // Remote control readonly variables
        $this->RegisterVariableInteger('PowerSetpoint', 'Power Setpoint', '', 30);
        IPS_SetVariableCustomAction($this->GetIDForIdent('PowerSetpoint'), 0);

        $this->RegisterVariableString('Strategy', 'Strategy', '', 31);
        IPS_SetVariableCustomAction($this->GetIDForIdent('Strategy'), 0);
    }

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

        // Correct Parent: MQTTClientSplitter
        $this->ConnectParent('{F7A0DD2E-7684-95C0-64C2-D2A9DC47577B}');

        $this->SubscribeTopics();
    }

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

        $topics = [
            "feedback-request/$device",
            "remote-control-request/$device"
        ];

        foreach ($topics as $topic) {
            $this->SendDebug("SUBSCRIBE", $topic, 0);

            $this->SendDataToParent(json_encode([
                "DataID"     => "{F7A0DD2E-7684-95C0-64C2-D2A9DC47577B}",
                "PacketType" => 8,   // SUBSCRIBE
                "Topic"      => $topic,
                "QoS"        => 0
            ]));
        }
    }

    public function ReceiveData($JSONString)
    {
        $data = json_decode($JSONString, true);

        if (!isset($data['Topic'])) {
            return;
        }

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

        $this->SendDebug("RX TOPIC", $topic, 0);
        $this->SendDebug("RX PAYLOAD", $payload, 0);

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

        if ($topic === "feedback-request/$device") {
            $this->HandleFeedbackRequest($device);
        }

        if ($topic === "remote-control-request/$device") {
            $this->HandleRemoteControlRequest($device, $payload);
        }
    }

    private function HandleFeedbackRequest($device)
    {
        $response = [
            "power_production" => GetValue($this->GetIDForIdent('PowerProduction')),
            "state_of_charge"  => GetValue($this->GetIDForIdent('StateOfCharge')),
            "is_running"       => GetValue($this->GetIDForIdent('IsRunning')),
            "is_ready"         => GetValue($this->GetIDForIdent('IsReady')),
            "min_soc"          => GetValue($this->GetIDForIdent('MinSoc')),
            "max_soc"          => GetValue($this->GetIDForIdent('MaxSoc'))
        ];

        $json  = json_encode($response);
        $topic = "feedback-response/$device";

        $this->SendDebug("TX FEEDBACK", $json, 0);

        $this->SendDataToParent(json_encode([
            "DataID"     => "{F7A0DD2E-7684-95C0-64C2-D2A9DC47577B}",
            "PacketType" => 3, // PUBLISH
            "Topic"      => $topic,
            "Payload"    => $json,
            "QoS"        => 0,
            "Retain"     => false
        ]));
    }

    private function HandleRemoteControlRequest($device, $payload)
    {
        $json = @json_decode($payload, true);
        if (!is_array($json)) {
            $this->SendDebug("ERROR", "Ungültiges JSON", 0);
            return;
        }

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

        if (isset($json['strategy'])) {
            SetValueString($this->GetIDForIdent('Strategy'), (string)$json['strategy']);
        }

        $payloadOut = json_encode($json);
        $topic = "remote-control-response/$device";

        $this->SendDebug("TX REMOTE", $payloadOut, 0);

        $this->SendDataToParent(json_encode([
            "DataID"     => "{F7A0DD2E-7684-95C0-64C2-D2A9DC47577B}",
            "PacketType" => 3,
            "Topic"      => $topic,
            "Payload"    => $payloadOut,
            "QoS"        => 0,
            "Retain"     => false
        ]));
    }

    public function RequestAction($Ident, $Value)
    {
        SetValue($this->GetIDForIdent($Ident), $Value);
    }
}
?>