<?php

declare(strict_types=1);

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

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

        /** -------------------------
         *  STATUS Variablen
         * ------------------------- */
        $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
         * ------------------------- */
        $this->RegisterVariableInteger('PowerSetpoint', 'Power Setpoint', '', 20);
        $this->RegisterVariableString('Strategy', 'Strategy', '', 21);

        $this->RegisterVariableString('RemoteControlPayload', 'Remote Control Payload', '', 30);

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

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

    /** ----------------------------------------------------------
     * REQUEST ACTION
     * ----------------------------------------------------------*/
    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
     * ----------------------------------------------------------*/
    private function Subscribe(string $topic): void
    {
        if (!$this->HasActiveParent()) {
            $this->SendDebug("MQTT", "Parent offline – subscribe skipped: $topic", 0);
            return;
        }

        $this->SendDataToParent(json_encode([
            'DataID' => '{A1B5C433-4F17-462D-AD71-383F5BBE4F5A}', // DataID deines Splitters → SUBSCRIBE
            'Type'   => 'SUBSCRIBE',
            'Topic'  => $topic
        ]));

        $this->SendDebug('MQTT', "Subscribed: $topic", 0);
    }

    /** ----------------------------------------------------------
     * PUBLISH
     * ----------------------------------------------------------*/
    private function Publish(string $topic, string $payload): void
    {
        if (!$this->HasActiveParent()) {
            $this->SendDebug("MQTT", "Parent offline – publish skipped: $topic", 0);
            return;
        }

        $this->SendDataToParent(json_encode([
            'DataID'  => '{A1B5C433-4F17-462D-AD71-383F5BBE4F5A}', // DataID deines Splitters → PUBLISH
            'Type'    => 'PUBLISH',
            'Topic'   => $topic,
            'Payload' => $payload
        ]));

        $this->SendDebug('MQTT', "Publish → $topic : $payload", 0);
    }

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

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

        /** --- MQTT CONNECTED EVENT vom Splitter --- */
        if (($data['Type'] ?? '') === 'MQTT_CONNECTED') {
            $this->SendDebug("MQTT", "Splitter connected → re-subscribing", 0);

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

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

        /** --- Normale MQTT Daten vom Splitter --- */
        if (($data['Type'] ?? '') !== 'MESSAGE') {
            return;
        }

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

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

        $this->SendDebug("MQTT", "RX → $topic : $payload", 0);

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

        /** -------------------------------------------
         * 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;
        }

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

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

            $json = json_decode($payload, true);

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

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