<?php

declare(strict_types=1);

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

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

        /** -------------------------------------------
         *  STATUS Variablen (schreibbar)
         * ------------------------------------------*/
        $this->RegisterVariableInteger('PowerProduction', 'Power Production', '', 10);
        $this->EnableAction('PowerProduction');

        $this->RegisterVariableBoolean('IsReady', 'Is Ready', '', 11);
        $this->EnableAction('IsReady');

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

        $this->RegisterVariableInteger('StateOfCharge', 'State of Charge', '', 13);
        $this->EnableAction('StateOfCharge');

        $this->RegisterVariableInteger('MinSOC', 'Min SOC', '', 14);
        $this->EnableAction('MinSOC');

        $this->RegisterVariableInteger('MaxSOC', 'Max SOC', '', 15);
        $this->EnableAction('MaxSOC');

        /** -------------------------------------------
         *  REMOTE CONTROL (readonly)
         * ------------------------------------------*/
        $this->RegisterVariableInteger('PowerSetpoint', 'Power Setpoint', '', 20);
        $this->RegisterVariableString('Strategy', 'Strategy', '', 21);
        $this->RegisterVariableString('RemoteControlPayload', 'Remote Control Payload', '', 30);

        /** -------------------------------------------
         *  FEEDBACK REQUEST (readonly)
         * ------------------------------------------*/
        $this->RegisterVariableString('FeedbackRequestPayload', 'Feedback Request Payload', '', 40);
    }

    public function ApplyChanges()
    {
        parent::ApplyChanges();
        $this->ConnectParent('{DBDA3967-E416-4354-A5C9-2FB9E7E2F5B3}'); // MQTT Client Gateway
    }

    /** ----------------------------------------------------------
     * REQUEST ACTION → Statusvariablen schreibbar machen
     * ----------------------------------------------------------*/
    public function RequestAction($Ident, $Value)
    {
        $this->SetValue($Ident, $Value);
        $device = $this->ReadPropertyString('DeviceID');

        if ($device === '') {
            return;
        }

        switch ($Ident) {
            case 'PowerProduction':
            case 'IsReady':
            case 'IsRunning':
            case 'StateOfCharge':
            case 'MinSOC':
            case 'MaxSOC':

                $payload = json_encode([
                    'power_production' => $this->GetValue('PowerProduction'),
                    'is_ready'         => $this->GetValue('IsReady'),
                    'is_running'       => $this->GetValue('IsRunning'),
                    'state_of_charge'  => $this->GetValue('StateOfCharge'),
                    'min_soc'          => $this->GetValue('MinSOC'),
                    'max_soc'          => $this->GetValue('MaxSOC')
                ]);

                $this->Publish("status/$device", $payload);
                break;
        }
    }

    /** ----------------------------------------------------------
     * SUBSCRIBE (nur bei „MQTT_CONNECTED“)
     * ----------------------------------------------------------*/
    private function Subscribe(string $topic): void
    {
        if (!$this->HasActiveParent()) {
            $this->SendDebug('MQTT', 'Subscribe ohne aktiven Parent: ' . $topic, 0);
            return;
        }

        $this->SendDebug('MQTT', 'Subscribe → ' . $topic, 0);

        $this->SendDataToParent(json_encode([
            'DataID'            => '{7F2A28E2-ABFA-4C77-B43F-042E1ED9F2D2}',
            'PacketType'        => 8,  // SUBSCRIBE
            'QualityOfService'  => 0,
            'Retain'            => false,
            'Topic'             => $topic,
            'Payload'           => ''
        ]));
    }

    /** ----------------------------------------------------------
     * PUBLISH
     * ----------------------------------------------------------*/
    private function Publish(string $topic, string $payload): void
    {
        if (!$this->HasActiveParent()) {
            $this->SendDebug('MQTT', 'Publish ohne aktiven Parent: ' . $topic, 0);
            return;
        }

        $this->SendDebug('MQTT', 'Publish → Topic=' . $topic . ' Payload=' . $payload, 0);

        $this->SendDataToParent(json_encode([
            'DataID'           => '{7F2A28E2-ABFA-4C77-B43F-042E1ED9F2D2}',
            'PacketType'       => 3,
            'QualityOfService' => 0,
            'Retain'           => false,
            'Topic'            => $topic,
            'Payload'          => $payload
        ]));
    }

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

        if (!is_array($data)) {
            return;
        }

        // --- MQTT CONNECTED EVENT ---
        if (isset($data['Event']) && $data['Event'] === 'MQTT_CONNECTED') {
            $this->SendDebug('MQTT', 'MQTT_CONNECTED → re-subscribing…', 0);

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

        // --- Normale MQTT Messages ---
        $topic   = $data['Topic'] ?? '';
        $payload = $data['Payload'] ?? '';

        $this->SendDebug('MQTT', "Receive: Topic=$topic Payload=$payload", 0);

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

        /** -------------------------------------------
         * 1️⃣ FEEDBACK REQUEST
         * ------------------------------------------*/
        if ($topic === "feedback-request/$device") {

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

            $json = json_decode($payload, true);
            if (!is_array($json)) {
                $json = [];
            }

            $response = array_merge($json, [
                "power_production" => $this->GetValue('PowerProduction'),
                "is_ready"         => $this->GetValue('IsReady'),
                "is_running"       => $this->GetValue('IsRunning'),
                "state_of_charge"  => $this->GetValue('StateOfCharge'),
                "min_soc"          => $this->GetValue('MinSOC'),
                "max_soc"          => $this->GetValue('MaxSOC')
            ]);

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

        /** -------------------------------------------
         * 2️⃣ REMOTE CONTROL REQUEST
         * ------------------------------------------*/
        if ($topic === "remote-control-request/$device") {

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

            $json = json_decode($payload, true);

            if (is_array($json)) {
                if (array_key_exists('power_setpoint', $json)) {
                    $this->SetValue('PowerSetpoint', (int) $json['power_setpoint']);
                }
                if (array_key_exists('strategy', $json)) {
                    $this->SetValue('Strategy', (string) $json['strategy']);
                }
            }

            // Antwort spiegeln
            $this->Publish("remote-control-response/$device", $payload);
            return;
        }
    }
}