<?php

declare(strict_types=1);

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

        // ---------------------------------------------------------------------
        // 1. Eigenschaften: Hardware-Verknüpfungen & MQTT Einstellungen
        // ---------------------------------------------------------------------
        $this->RegisterPropertyString('MQTTBaseTopic', 'Test VGT_Steuerung/Komm');
        
        // Externe Hardware-Quellen (Lesen)
        $this->RegisterPropertyInteger('SourceSoC', 0);
        $this->RegisterPropertyInteger('SourcePowerProd', 0);
        $this->RegisterPropertyInteger('SourceIsReady', 0);
        $this->RegisterPropertyInteger('SourceIsRunning', 0);
        $this->RegisterPropertyInteger('SourceMinSoC', 0);
        $this->RegisterPropertyInteger('SourceMaxSoC', 0);
        
        // Hardware-Ziel (Schreiben)
        $this->RegisterPropertyInteger('TargetControlVar', 0);

        // ---------------------------------------------------------------------
        // 2. Variablen im Modul erstellen (zur Anzeige & Steuerung)
        // ---------------------------------------------------------------------
        // Diese Variablen spiegeln den aktuellen Zustand wider
        $this->RegisterVariableString('Strategy', 'Strategy', '', 10);
        $this->RegisterVariableInteger('PowerSetpoint', 'Power Setpoint', '', 20);
        
        // Visualisierung der gelesenen Hardware-Werte (optional, aber gut zur Kontrolle)
        $this->RegisterVariableFloat('Visu_SoC', 'State of Charge', '~Intensity.100', 30);
        $this->RegisterVariableFloat('Visu_Production', 'Power Production', '~Watt', 40);
        $this->RegisterVariableBoolean('Visu_IsReady', 'Is Ready', '~Switch', 50);

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

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

        // ---------------------------------------------------------------------
        // 3. MQTT Filter setzen (Abonnement)
        // ---------------------------------------------------------------------
        // Wir sagen dem Parent (MQTT Splitter): "Schick mir alles, was auf mein Topic kommt"
        $topic = $this->ReadPropertyString('MQTTBaseTopic');
        
        // Regex Filter für ReceiveData: Alles was mit dem Topic beginnt
        // Wir escapen Slash /, damit Regex funktioniert
        $cleanTopic = preg_quote($topic, '/');
        // Filter: Topic muss matchen
        $this->SetReceiveDataFilter(".*\"Topic\":\"" . $cleanTopic . "/.*\".*");

        // ---------------------------------------------------------------------
        // 4. Events registrieren (Hardware überwachen)
        // ---------------------------------------------------------------------
        // Wenn sich der externe SoC ändert, müssen wir die Logik ausführen
        $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);
    }

    // -------------------------------------------------------------------------
    // MQTT EMPFANG (Ersatz für Events auf MQTT-Variablen)
    // -------------------------------------------------------------------------
    public function ReceiveData($JSONString)
    {
        $data = json_decode($JSONString);
        
        // UTF-8 Payload decodieren
        $payload = utf8_decode($data->Payload);
        $topic = $data->Topic;
        
        $baseTopic = $this->ReadPropertyString('MQTTBaseTopic');

        // Prüfen: Ist es der Writebefehl?
        if ($topic === $baseTopic . '/Writebefehl') {
            $this->ProcessWriteCommand($payload);
        }
        // Prüfen: Ist es der Lesebefehl?
        elseif ($topic === $baseTopic . '/Lesebefehl') {
            $this->ProcessReadCommand();
        }
    }

    // -------------------------------------------------------------------------
    // LOGIK: Interne Verarbeitung
    // -------------------------------------------------------------------------
    
    // Hardware-Überwachung (MessageSink) bleibt gleich
    public function MessageSink($TimeStamp, $SenderID, $Message, $Data)
    {
        if ($Message == VM_UPDATE) {
            // Visualisierung aktualisieren (SoC im Modul anzeigen)
            $socID = $this->ReadPropertyInteger('SourceSoC');
            if ($SenderID == $socID) {
                $this->SetValue('Visu_SoC', $Data[0]);
            }

            // Steuerungslogik immer ausführen wenn sich was ändert
            $this->ExecuteControlLogic();
        }
    }

    // Manuelles Schalten im WebFront
    public function RequestAction($Ident, $Value)
    {
        switch ($Ident) {
            case 'Strategy':
            case 'PowerSetpoint':
                $this->SetValue($Ident, $Value);
                $this->ExecuteControlLogic();
                break;
        }
    }

    // -------------------------------------------------------------------------
    // CORE LOGIK
    // -------------------------------------------------------------------------

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

        // 1. Variablen setzen
        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']);
        }

        // 2. Hardware sofort ansteuern
        $this->ExecuteControlLogic();

        // 3. Antwort senden (an .../Writebefehl Antwort)
        $output = [
            'power_setpoint' => $this->GetValue('PowerSetpoint'),
            'strategy'       => $this->GetValue('Strategy')
        ];
        
        $this->SendMQTT($this->ReadPropertyString('MQTTBaseTopic') . '/Writebefehl Antwort', json_encode($output));
    }

    private function ProcessReadCommand()
    {
        // Hardware Werte lesen
        $data = $this->GatherHardwareData();

        // Lokale Visu-Variablen updaten (damit man im Modul sieht was passiert)
        $this->SetValue('Visu_Production', $data['raw_prod']); // Hilfswert speichern
        $this->SetValue('Visu_IsReady', $data['is_ready']);

        // JSON für MQTT
        $mqttData = [
            'power_production' => -1 * $data['raw_prod'], // Vorzeichen wie im Original
            'is_ready'         => $data['is_ready'],
            'is_running'       => $data['is_running'],
            'state_of_charge'  => $data['soc'],
            'min_soc'          => $data['min_soc'],
            'max_soc'          => $data['max_soc']
        ];

        // Senden an .../Lesebefehl Antwort
        $this->SendMQTT($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');
        
        // SoC holen (Live)
        $socID = $this->ReadPropertyInteger('SourceSoC');
        $soc = IPS_VariableExists($socID) ? GetValue($socID) : 0;

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

    // Hilfsfunktion: Hardware Daten sammeln
    private function GatherHardwareData()
    {
        $safeGet = function($propName) {
            $id = $this->ReadPropertyInteger($propName);
            return IPS_VariableExists($id) ? GetValue($id) : 0;
        };

        return [
            'raw_prod'   => $safeGet('SourcePowerProd'),
            'is_ready'   => (bool)$safeGet('SourceIsReady'),
            'is_running' => (bool)$safeGet('SourceIsRunning'),
            'soc'        => $safeGet('SourceSoC'),
            'min_soc'    => $safeGet('SourceMinSoC'),
            'max_soc'    => $safeGet('SourceMaxSoC'),
        ];
    }

    // Hilfsfunktion: MQTT Senden
    protected function SendMQTT($Topic, $Payload)
    {
        $Data['DataID'] = '{043EA491-0325-4ADD-8FC2-A30C8EEB4D3F}'; // MQTT Client/Splitter GUID
        $Data['PacketType'] = 3; // Publish
        $Data['QualityOfService'] = 0;
        $Data['Retain'] = false;
        $Data['Topic'] = $Topic;
        $Data['Payload'] = $Payload;

        $JSON = json_encode($Data);
        // An Parent senden
        $this->SendDataToParent($JSON);
    }
}
?>