<?php

declare(strict_types=1);

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

        // Device-ID
        $this->RegisterPropertyString('DeviceID', '');

        // --- Variablen erstellen ---
        $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', '', 20);
        $this->RegisterVariableFloat('MaxSOC', 'Max SOC', '', 21);

        // Remote Control Variablen
        $this->RegisterVariableFloat('PowerSetpoint', 'Power Setpoint', '', 30);
        $this->RegisterVariableString('Strategy', 'Strategy', '', 31);

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

        // MQTT Splitter
        $this->ConnectParent('{F7A0DD2E-7684-95C0-64C2-D2A9DC47577B}');
    }

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

        $this->ConnectParent('{F7A0DD2E-7684-95C0-64C2-D2A9DC47577B}');

        $dev = $this->ReadPropertyString('DeviceID');
        if ($dev !== '') {
            $this->Subscribe("feedback-request/$dev");
            $this->Subscribe("remote-control-request/$dev");
        }
    }

    public function RequestAction($Ident, $Value)
    {
        // Variablen schreibbar machen
        SetValue($this->GetIDForIdent($Ident), $Value);
        return true;
    }

    /* ---------------------------------------------------------
     * CONFIG FORM
     * ---------------------------------------------------------*/
    public function GetConfigurationForm()
    {
        return json_encode([
            "elements" => [
                ["type" => "ValidationTextBox", "name" => "DeviceID", "caption" => "Device ID"]
            ]
        ]);
    }

    /* ---------------------------------------------------------
     * MQTT Subscribe
     * ---------------------------------------------------------*/
    private function Subscribe(string $topic)
    {
        if (!$this->HasActiveParent()) return;

        $this->SendDataToParent(json_encode([
            "DataID" => "{F7A0DD2E-7684-95C0-64C2-D2A9DC47577B}",
            "Buffer" => [
                "Topic" => $topic,
                "QualityOfService" => 0
            ]
        ]));
    }

    private function Publish(string $topic, string $payload)
    {
        if (!$this->HasActiveParent()) return;

        $this->SendDataToParent(json_encode([
            "DataID" => "{F7A0DD2E-7684-95C0-64C2-D2A9DC47577B}",
            "Buffer" => [
                "Command" => "PUBLISH",
                "Topic" => $topic,
                "Payload" => $payload,
                "Retain" => false,
                "QualityOfService" => 0
            ]
        ]));
    }

    /* ---------------------------------------------------------
     * RECEIVE MQTT
     * ---------------------------------------------------------*/
    public function ReceiveData($JSONString)
    {
        $data = json_decode($JSONString, true);

        if (!isset($data['Type'])) return;

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

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

        // Beim Connect Topics neu abonnieren
        if ($type === "MQTT_CONNECTED") {
            if ($device !== '') {
                $this->Subscribe("feedback-request/$device");
                $this->Subscribe("remote-control-request/$device");
            }
            return;
        }

        if ($type !== "MESSAGE") return;

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

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

            // Variablen abrufen
            $power = GetValueFloat($this->GetIDForIdent('PowerProduction'));
            $soc   = GetValueFloat($this->GetIDForIdent('StateOfCharge'));
            $run   = GetValueBoolean($this->GetIDForIdent('IsRunning'));

            $min   = GetValueFloat($this->GetIDForIdent('MinSOC'));
            $max   = GetValueFloat($this->GetIDForIdent('MaxSOC'));

            $isReady = ($run && $soc > $min && $soc < $max);
            SetValueBoolean($this->GetIDForIdent('IsReady'), $isReady);

            // Antwort erstellen
            $response = [
                "power_production" => $power,
                "state_of_charge"  => $soc,
                "is_running"       => $run,
                "is_ready"         => $isReady,
                "min_soc"          => $min,
                "max_soc"          => $max
            ];

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

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

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

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

            // power_setpoint → Float-Variable
            if (isset($json["power_setpoint"])) {
                SetValueFloat(
                    $this->GetIDForIdent('PowerSetpoint'),
                    floatval($json["power_setpoint"])
                );
            }

            // strategy → String-Variable
            if (isset($json["strategy"])) {
                SetValueString(
                    $this->GetIDForIdent('Strategy'),
                    strval($json["strategy"])
                );
            }

            return;
        }
    }
}

?>