<?php

declare(strict_types=1);

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

        // ---------------------------------------------------------
        // CONFIG PROPERTIES (for form.json)
        // ---------------------------------------------------------
        $this->RegisterPropertyString('DeviceID', '');

        $this->RegisterPropertyInteger('VarPowerProduction', 0);
        $this->RegisterPropertyInteger('VarStateOfCharge', 0);
        $this->RegisterPropertyInteger('VarIsRunning', 0);

        $this->RegisterPropertyInteger('MinSOC', 20);
        $this->RegisterPropertyInteger('MaxSOC', 80);

        // ---------------------------------------------------------
        // INTERNAL VARIABLES
        // ---------------------------------------------------------
        $this->RegisterVariableFloat('PowerSetpoint', 'Power Setpoint', '', 20);
        $this->RegisterVariableFloat('PowerSetpointAbs', 'Power Setpoint (ABS)', '', 21);
        $this->RegisterVariableFloat('PowerSetpointPositive', 'Power Setpoint Positive', '', 22);
        $this->RegisterVariableFloat('PowerSetpointNegative', 'Power Setpoint Negative', '', 23);

        $this->RegisterVariableString('Strategy', 'Strategy', '', 24);
        $this->RegisterVariableString('RemoteControlPayload', 'Remote Control Payload', '', 25);

        $this->RegisterVariableString('FeedbackRequestPayload', 'Feedback Request Payload', '', 40);
        $this->RegisterVariableString('FeedbackResponsePayload', 'Feedback Response Payload', '', 41);
    }

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

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

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

    // ---------------------------------------------------------
    // REQUESTACTION (nur Setzen)
    // ---------------------------------------------------------
    public function RequestAction($Ident, $Value)
    {
        $this->SetValue($Ident, $Value);
    }

    // ---------------------------------------------------------
    // MQTT SUBSCRIBE
    // ---------------------------------------------------------
    private function Subscribe(string $topic): void
    {
        if (!$this->HasActiveParent()) {
            return;
        }

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

    // ---------------------------------------------------------
    // MQTT PUBLISH
    // ---------------------------------------------------------
    private function Publish(string $topic, string $payload): void
    {
        if (!$this->HasActiveParent()) {
            return;
        }

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

    // ---------------------------------------------------------
    // RECEIVE MQTT DATA
    // ---------------------------------------------------------
    public function ReceiveData($JSONString)
    {
        $data = json_decode($JSONString, true);
        if (!is_array($data)) return;

        if (($data['Type'] ?? '') !== 'MESSAGE') return;

        $topic   = $data['Topic'];
        $payload = $data['Payload'];
        $device  = $this->ReadPropertyString('DeviceID');

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

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

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

            $reply = $this->BuildFeedbackResponse();
            $json  = json_encode($reply);

            $this->SetValue('FeedbackResponsePayload', $json);
            $this->Publish("feedback-response/$device", $json);
            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 Handling
            if (isset($json['power_setpoint'])) {
                $ps = floatval($json['power_setpoint']);
                $this->SetValue('PowerSetpoint', $ps);

                $this->SetValue('PowerSetpointAbs', abs($ps));

                if ($ps > 0) {
                    $this->SetValue('PowerSetpointPositive', $ps);
                    $this->SetValue('PowerSetpointNegative', 0);
                } elseif ($ps < 0) {
                    $this->SetValue('PowerSetpointNegative', $ps);
                    $this->SetValue('PowerSetpointPositive', 0);
                } else {
                    $this->SetValue('PowerSetpointPositive', 0);
                    $this->SetValue('PowerSetpointNegative', 0);
                }
            }

            // Strategy Handling
            if (isset($json['strategy'])) {
                $this->SetValue('Strategy', $json['strategy']);
            }

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

    // ---------------------------------------------------------
    // FEEDBACK RESPONSE BUILDER
    // ---------------------------------------------------------
    private function BuildFeedbackResponse(): array
    {
        $idProd = $this->ReadPropertyInteger('VarPowerProduction');
        $idSOC  = $this->ReadPropertyInteger('VarStateOfCharge');
        $idRun  = $this->ReadPropertyInteger('VarIsRunning');

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

        $soc = ($idSOC > 0) ? GetValue($idSOC) : 0;
        $isRunning = ($idRun > 0) ? GetValue($idRun) : false;

        $isReady = ($isRunning && ($soc >= $min) && ($soc <= $max));

        return [
            'power_production' => ($idProd > 0) ? GetValue($idProd) : 0,
            'is_running'       => $isRunning,
            'state_of_charge'  => $soc,
            'min_soc'          => $min,
            'max_soc'          => $max,
            'is_ready'         => $isReady
        ];
    }
}