<?php

declare(strict_types=1);

require_once __DIR__ . "/libs/ShellyParser.php";

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

        $this->ConnectParent('{C6D2AEB3-6E1F-4B2E-8E69-3A1A00246850}');
        $this->Subscribe("#");

        $this->RegisterPropertyString("Devices", "[]");
        $this->RegisterPropertyBoolean("Debug", false);
    }


    public function ApplyChanges()
    {
        parent::ApplyChanges();
        $this->ConnectParent('{C6D2AEB3-6E1F-4B2E-8E69-3A1A00246850}');
        $this->Subscribe("#");
    }


    /* ------------------------------------------------------------------
     * MQTT SUBSCRIBE
     * ------------------------------------------------------------------*/
    private function Subscribe(string $topic): void
    {
        $packet = [
            "PacketType" => 8,
            "QualityOfService" => 0,
            "Retain" => false,
            "Topic" => $topic,
            "Payload" => ""
        ];

        $this->SendDataToParent(json_encode([
            "DataID" => "{043EA491-0325-4ADD-8FC2-A30C8EEB4D3F}"
        ] + $packet));
    }


    /* ------------------------------------------------------------------
     * MQTT PUBLISH
     * ------------------------------------------------------------------*/
    private function Publish(string $topic, string $payload): void
    {
        $packet = [
            "PacketType" => 3,
            "QualityOfService" => 0,
            "Retain" => false,
            "Topic" => $topic,
            "Payload" => $payload
        ];

        $this->SendDataToParent(json_encode([
            "DataID" => "{043EA491-0325-4ADD-8FC2-A30C8EEB4D3F}"
        ] + $packet));
    }


    /* ------------------------------------------------------------------
     * RequestAction → Schalten des Outputs
     * ------------------------------------------------------------------*/
    public function RequestAction($Ident, $Value)
    {
        $iid = IPS_GetParent($this->InstanceID);

        $this->SetValue($Ident, $Value);

        // output?
        if ($Ident === "output") {

            $deviceID = IPS_GetName($iid);

            $topic = $deviceID . "/rpc/Switch.Set";
            $payload = json_encode([
                "id" => 0,
                "on" => (bool)$Value
            ]);

            $this->Publish($topic, $payload);
        }
    }


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

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

        if ($topic === "") {
            return;
        }

        $parts = explode("/", $topic);
        $deviceID = $parts[0] ?? "";

        if ($deviceID === "") {
            return;
        }

        // ONLINE
        if (isset($parts[1]) && $parts[1] === "online") {
            $this->HandleOnline($deviceID, $payload);
            return;
        }

        // RPC
        if ((($parts[1] ?? "") === "events") && (($parts[2] ?? "") === "rpc")) {
            $this->HandleRPC($deviceID, $payload);
            return;
        }
    }


    /* ------------------------------------------------------------------
     * ONLINE
     * ------------------------------------------------------------------*/
    private function HandleOnline(string $deviceID, string $payload)
    {
        $iid = $this->GetOrCreateDeviceInstance($deviceID);

        $onlineID = @$this->GetIDForIdentEx("online", $iid);
        if (!$onlineID) {
            $this->RegisterVariableBoolean("online", "Online");
        }

        $this->SetValue("online", $payload === "true");
    }


    /* ------------------------------------------------------------------
     * RPC
     * ------------------------------------------------------------------*/
    private function HandleRPC(string $deviceID, string $payload)
    {
        $json = json_decode($payload, true);
        if (!is_array($json)) {
            return;
        }

        $src = $json["src"] ?? "";
        if (!str_starts_with($src, "shelly")) {
            return;
        }

        // Modell ermitteln
        $type = ShellyParser::ExtractType($src);

        $iid = $this->GetOrCreateDeviceInstance($deviceID);

        // Typ speichern
        $this->RegisterVariableString("type", "Geräte-Typ");
        $this->SetValue("type", $type);

        // Parameter extrahieren
        $mapped = ShellyParser::MapParams($json["params"] ?? []);

        // Variablen anlegen
        if (isset($mapped["input"])) {
            $this->RegisterVariableBoolean("input", "Input");
            $this->SetValue("input", $mapped["input"]);
        }

        if (isset($mapped["output"])) {
            $this->RegisterVariableBoolean("output", "Output");
            $this->EnableAction("output");
            $this->SetValue("output", $mapped["output"]);
        }

        if (isset($mapped["temperature"])) {
            $this->RegisterVariableFloat("temperature", "Temperatur");
            $this->SetValue("temperature", $mapped["temperature"]);
        }
    }


    /* ------------------------------------------------------------------
     * Helper → Child-Instanzen erzeugen
     * ------------------------------------------------------------------*/
    private function GetOrCreateDeviceInstance(string $deviceID): int
    {
        foreach (IPS_GetInstanceListByModuleID("{ED0ED0AC-3843-0888-DF27-FA45435BCEF3}") as $id) {
            if (IPS_GetName($id) === $deviceID) {
                return $id;
            }
        }

        // neue Instanz
        $iid = IPS_CreateInstance("{ED0ED0AC-3843-0888-DF27-FA45435BCEF3}");
        IPS_SetName($iid, $deviceID);
        IPS_SetParent($iid, $this->InstanceID);

        return $iid;
    }
}