<?php

declare(strict_types=1);

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

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

        // --- Variablen anlegen ---
        $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);

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

        $this->RegisterVariableString('FeedbackRequestPayload', 'Feedback Request', '', 80);
        $this->RegisterVariableString('RemoteControlPayload', 'Remote Control Request', '', 81);

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

    public function ApplyChanges()
    {
        parent::ApplyChanges();
        $this->ConnectParent('{F7A0DD2E-7684-95C0-64C2-D2A9DC47577B}');
    }

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

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

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

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

    /* =========================================================
     * MQTT Publish (kompatibel zu MQTT-Splitter)
     * ========================================================= */
    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
            ]
        ]));
    }

    /* =========================================================
     * MQTT RECEIVE
     * ========================================================= */
    public function ReceiveData($JSONString)
    {
        $data = json_decode($JSONString, true);
        if (!isset($data['Buffer'])) return;

        $buf = $data['Buffer'];
        $device = $this->ReadPropertyString('DeviceID');

        // Wenn der MQTT-Splitter ready ist → abonnieren
        if (isset($buf['Message']) && $buf['Message'] === "MQTT_CONNECTED") {
            if ($device !== '') {
                $this->Subscribe("feedback-request/$device");
                $this->Subscribe("remote-control-request/$device");
            }
            return;
        }

        // echte MQTT Nachrichten
        if (!isset($buf['Topic']) || !isset($buf['Payload'])) return;

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

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

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

            $power = GetValueFloat($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);

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

            $this->Publish("feedbackresponse/$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;

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

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

            return;
        }
    }
}

?>