<?php

declare(strict_types=1);

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

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

        // 6 editable values (response payload)
        $this->RegisterVariableFloat("PowerProduction", "Power Production", "", 10);
        $this->EnableAction("PowerProduction");

        $this->RegisterVariableFloat("StateOfCharge", "State of Charge", "", 20);
        $this->EnableAction("StateOfCharge");

        $this->RegisterVariableBoolean("IsRunning", "Is Running", "", 30);
        $this->EnableAction("IsRunning");

        $this->RegisterVariableBoolean("IsReady", "Is Ready", "", 40);
        $this->EnableAction("IsReady");

        $this->RegisterVariableInteger("MinSOC", "Min SOC", "", 50);
        $this->EnableAction("MinSOC");

        $this->RegisterVariableInteger("MaxSOC", "Max SOC", "", 60);
        $this->EnableAction("MaxSOC");

        // Remote control readonly values
        $this->RegisterVariableFloat("RC_PowerSetpoint", "RC Power Setpoint", "", 70);
        $this->RegisterVariableString("RC_Strategy", "RC Strategy", "", 80);

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


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

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

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

        // Required incoming topics
        $topics = [
            "feedback-request/" . $device,
            "remote-control-request/" . $device
        ];

        // Subscribe each topic using the CORRECT DataID
        foreach ($topics as $t) {
            $this->SendDataToParent(json_encode([
                "DataID" => "{043EA491-0325-4ADD-8FC2-A30C8EEB4D3F}", // <- correct for subscribe
                "Topic"  => $t,
                "Retain" => false
            ]));
        }
    }


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


    public function ReceiveData($JSONString)
    {
        $data = json_decode($JSONString);

        // This format is correct for your MQTT client splitter:
        // { "Topic": "...", "Payload": "..." }

        if (!isset($data->Topic) || !isset($data->Payload)) {
            return;
        }

        $topic   = $data->Topic;
        $payload = $data->Payload;

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

        if ($topic === "feedback-request/" . $device) {
            $this->HandleFeedbackRequest();
        }

        if ($topic === "remote-control-request/" . $device) {
            $this->HandleRemoteControlRequest($payload);
        }
    }


    // ----------------------------------------------------------------------------
    // FEEDBACK REQUEST → SEND STATE JSON
    // ----------------------------------------------------------------------------
    private function HandleFeedbackRequest()
    {
        $response = [
            "power_production" => GetValue($this->GetIDForIdent("PowerProduction")),
            "state_of_charge"  => GetValue($this->GetIDForIdent("StateOfCharge")),
            "is_running"       => GetValue($this->GetIDForIdent("IsRunning")),
            "is_ready"         => GetValue($this->GetIDForIdent("IsReady")),
            "min_soc"          => GetValue($this->GetIDForIdent("MinSOC")),
            "max_soc"          => GetValue($this->GetIDForIdent("MaxSOC"))
        ];

        $topic = "feedback-response/" . $this->ReadPropertyString("DeviceID");

        $this->SendToMQTT($topic, json_encode($response));
    }


    // ----------------------------------------------------------------------------
    // REMOTE CONTROL REQUEST → WRITE VALUES + RESPOND
    // ----------------------------------------------------------------------------
    private function HandleRemoteControlRequest(string $payload)
    {
        $data = json_decode($payload, true);
        if (!is_array($data)) {
            return;
        }

        if (isset($data["power_setpoint"])) {
            SetValue($this->GetIDForIdent("RC_PowerSetpoint"), $data["power_setpoint"]);
        }

        if (isset($data["strategy"])) {
            SetValue($this->GetIDForIdent("RC_Strategy"), $data["strategy"]);
        }

        // Respond back
        $topic = "remote-control-response/" . $this->ReadPropertyString("DeviceID");
        $this->SendToMQTT($topic, json_encode($data));
    }


    // ----------------------------------------------------------------------------
    // MQTT PUBLISH (correct format for your splitter!)
    // ----------------------------------------------------------------------------
    private function SendToMQTT(string $topic, string $payload)
    {
        $this->SendDataToParent(json_encode([
            "DataID" => "{043EA491-0325-4ADD-8FC2-A30C8EEB4D3F}", // CORRECT!
            "Topic"  => $topic,
            "Payload" => $payload,
            "Retain" => false
        ]));
    }


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

?>