<?php

declare(strict_types=1);

class VGT_Sub extends IPSModule
{
    public function Create()
    {
        parent::Create();
        
        // --- Konfiguration ---
        $this->RegisterPropertyString('MQTTBaseTopic', 'Test VGT_Steuerung/Komm');
        
        // --- Optionale Gateway-Konfig (Nur für IO/Socket relevant) ---
        $this->RegisterPropertyString('MQTTUser', '');
        $this->RegisterPropertyString('MQTTPassword', '');
        $this->RegisterPropertyBoolean('UpdateGatewayConfig', false);

        // --- Hardware Quellen ---
        $this->RegisterPropertyInteger('SourceSoC', 0);
        $this->RegisterPropertyInteger('SourcePowerProd', 0);
        $this->RegisterPropertyInteger('SourceIsReady', 0);
        $this->RegisterPropertyInteger('SourceIsRunning', 0);
        $this->RegisterPropertyInteger('SourceMinSoC', 0);
        $this->RegisterPropertyInteger('SourceMaxSoC', 0);
        $this->RegisterPropertyInteger('TargetControlVar', 0);

        // --- Interne Variablen ---
        $this->RegisterVariableString('Strategy', 'Strategy', '', 10);
        $this->RegisterVariableInteger('PowerSetpoint', 'Power Setpoint', '', 20);

        $this->EnableAction('Strategy');
        $this->EnableAction('PowerSetpoint');
    }

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

        // 1. Filter setzen (Abonnieren)
        $topic = $this->ReadPropertyString('MQTTBaseTopic');
        if($topic !== "") {
            $cleanTopic = preg_quote($topic, '/');
            // Dieser Filter funktioniert für beide Splitter-Varianten
            $this->SetReceiveDataFilter(".*\"Topic\":\"" . $cleanTopic . "/.*\".*");
        }

        // 2. Gateway Config (Optional)
        if ($this->ReadPropertyBoolean('UpdateGatewayConfig')) {
            $this->ConfigureGateway();
        }

        // 3. Events registrieren
        $socID = $this->ReadPropertyInteger('SourceSoC');
        if (IPS_VariableExists($socID)) $this->RegisterMessage($socID, VM_UPDATE);
        $this->RegisterMessage($this->GetIDForIdent('Strategy'), VM_UPDATE);
        $this->RegisterMessage($this->GetIDForIdent('PowerSetpoint'), VM_UPDATE);
    }

    public function ReceiveData($JSONString)
    {
        $data = json_decode($JSONString);
        
        // Payload Dekodierung
        $payload = utf8_decode($data->Payload);
        $topic = $data->Topic;
        
        $baseTopic = $this->ReadPropertyString('MQTTBaseTopic');

        if ($topic === $baseTopic . '/Writebefehl') {
            $this->ProcessWriteCommand($payload);
        }
        elseif ($topic === $baseTopic . '/Lesebefehl') {
            $this->ProcessReadCommand();
        }
    }

    private function ProcessWriteCommand($jsonInput)
    {
        $data = json_decode($jsonInput, true);
        if ($data === null) return;

        if (isset($data['power_setpoint'])) {
            $val = $data['power_setpoint'];
            if ($val > 6000) $val = 6000; elseif ($val < -6000) $val = -6000;
            $this->SetValue('PowerSetpoint', $val);
        }
        if (isset($data['strategy'])) {
            $this->SetValue('Strategy', $data['strategy']);
        }

        $this->ExecuteControlLogic();

        $output = ['power_setpoint' => $this->GetValue('PowerSetpoint'), 'strategy' => $this->GetValue('Strategy')];
        $this->SendMQTT($this->ReadPropertyString('MQTTBaseTopic') . '/Writebefehl Antwort', json_encode($output));
    }

    private function ProcessReadCommand()
    {
        $safeGet = function($prop) { $id = $this->ReadPropertyInteger($prop); return IPS_VariableExists($id) ? GetValue($id) : 0; };
        
        $mqttData = [
            'power_production' => -1 * $safeGet('SourcePowerProd'),
            'is_ready'         => (bool)$safeGet('SourceIsReady'),
            'is_running'       => (bool)$safeGet('SourceIsRunning'),
            'state_of_charge'  => $safeGet('SourceSoC'),
            'min_soc'          => $safeGet('SourceMinSoC'),
            'max_soc'          => $safeGet('SourceMaxSoC')
        ];
        $this->SendMQTT($this->ReadPropertyString('MQTTBaseTopic') . '/Lesebefehl Antwort', json_encode($mqttData));
    }

    private function ExecuteControlLogic()
    {
        $targetID = $this->ReadPropertyInteger('TargetControlVar');
        if (!IPS_VariableExists($targetID)) return;

        $strategy = $this->GetValue('Strategy');
        $setpoint = $this->GetValue('PowerSetpoint');
        $socID = $this->ReadPropertyInteger('SourceSoC');
        $soc = IPS_VariableExists($socID) ? GetValue($socID) : 0;

        if ($strategy == "activate") {
            RequestAction($targetID, $setpoint);
        } elseif ($strategy == "stop") {
            RequestAction($targetID, 0);
        } else {
            if ((int)$soc == 50) RequestAction($targetID, 0);
            elseif ($soc < 50) RequestAction($targetID, 2500);
            else RequestAction($targetID, -2500);
        }
    }

    protected function SendMQTT($Topic, $Payload)
    {
        // Standard DataID für MQTT. Funktioniert meistens auch mit dem 77B-Modul.
        $Data['DataID'] = '{043EA491-0325-4ADD-8FC2-A30C8EEB4D3F}';
        $Data['PacketType'] = 3;
        $Data['QualityOfService'] = 0;
        $Data['Retain'] = false;
        $Data['Topic'] = $Topic;
        $Data['Payload'] = $Payload;
        $this->SendDataToParent(json_encode($Data));
    }
    
    // Automatische Konfiguration des Parents (falls aktiviert)
    private function ConfigureGateway()
    {
        $instance = IPS_GetInstance($this->InstanceID);
        $parentId = $instance['ConnectionID']; // Das ist dein 77B Modul oder der native Splitter
        
        if ($parentId > 0) {
            // Wir versuchen, User/Pass auf dem Parent zu setzen (manche Module haben das direkt)
            // Oder wir suchen den IO darunter.
            
            $user = $this->ReadPropertyString('MQTTUser');
            $pass = $this->ReadPropertyString('MQTTPassword');
            
            // Check: Hat der Parent direkt Username/Password? (Schnittcher Modul hat das oft)
            if (@IPS_GetProperty($parentId, 'Username') !== false) {
                 IPS_SetProperty($parentId, 'Username', $user);
                 IPS_SetProperty($parentId, 'Password', $pass);
                 IPS_ApplyChanges($parentId);
                 return;
            }

            // Wenn nicht, suchen wir den IO darunter (Native Symcon Logik)
            $parentInfo = IPS_GetInstance($parentId);
            $ioID = $parentInfo['ConnectionID'];
            if ($ioID > 0) {
                 if (@IPS_GetProperty($ioID, 'Username') !== false) {
                     IPS_SetProperty($ioID, 'Username', $user);
                     IPS_SetProperty($ioID, 'Password', $pass);
                     IPS_ApplyChanges($ioID);
                 }
            }
        }
    }

    public function RequestAction($Ident, $Value) {
        $this->SetValue($Ident, $Value);
        $this->ExecuteControlLogic();
    }
    
    public function MessageSink($TimeStamp, $SenderID, $Message, $Data) {
        if ($Message == VM_UPDATE) $this->ExecuteControlLogic();
    }
}
?>