<?php

class PV_Forecast extends IPSModule
{
    private const ARCHIVE_GUID = "{43192F0B-135B-4CE7-A0A7-1475603F3060}";

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

        $this->RegisterPropertyString("URL", "");
        $this->RegisterPropertyInteger("ActualVariableID", 0);
        $this->RegisterPropertyString("RefreshMode", "interval"); // interval | daily
        $this->RegisterPropertyInteger("RefreshMinutes", 5);
        $this->RegisterPropertyInteger("RefreshTime", 6 * 3600); // 06:00 in Sekunden
        $this->RegisterPropertyBoolean("ActualIsWatt", true);

        $this->RegisterTimer("UpdateForecastTimer", 0, 'IPS_RequestAction($_IPS["TARGET"], "UpdateForecast", 0);');

        $this->RegisterHook("/hook/solcastcompare");
    }

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

            $this->SetVisualizationType(1);

            $mode = $this->ReadPropertyString("RefreshMode");

            if ($mode === "interval") {
                // 🔁 Intervall-Modus
                $mins = max(1, (int)$this->ReadPropertyInteger("RefreshMinutes"));
                $this->SetTimerInterval(
                    "UpdateForecastTimer",
                    $mins * 60 * 1000
                );
            } else {
                // ⏰ Tageszeit-Modus
                $this->SetTimerInterval(
                    "UpdateForecastTimer",
                    60 * 1000 // jede Minute prüfen
                );
            }

            $this->RegisterHook("/hook/solcastcompare");
        }


    public function RequestAction($Ident, $Value)
    {
        if ($Ident === "UpdateForecast") {
            $this->HandleScheduledUpdate();
            return;
        }

        throw new Exception("Unknown Ident: " . $Ident);
    }

    private function UpdateForecast()
    {
        $url = trim($this->ReadPropertyString("URL"));
        if ($url === "") {
            $this->SendDebug("UpdateForecast", "URL ist leer", 0);
            return;
        }

        $json = @Sys_GetURLContent($url);
        if ($json === false || $json === "") {
            $this->SendDebug("UpdateForecast", "Leere Antwort von URL", 0);
            return;
        }

        $data = json_decode($json, true);
        if (!is_array($data)) {
            $this->SendDebug("UpdateForecast", "JSON decode fehlgeschlagen", 0);
            return;
        }

        $this->SetBuffer("ForecastRaw", $json);
        $this->SetBuffer("ForecastTS", (string)time());
        $this->SendDebug("UpdateForecast", "Forecast aktualisiert", 0);
    }

    public function GetVisualizationTile(): string
    {
        if ($this->GetBuffer("ForecastRaw") === "") {
            $this->UpdateForecast();
        }

        $html = file_get_contents(__DIR__ . "/module.html");
        $html = str_replace("{{INSTANCE_ID}}", (string)$this->InstanceID, $html);
        return $html;
    }

    protected function ProcessHookData()
    {
        $instance = isset($_GET["instance"]) ? (int)$_GET["instance"] : 0;
        $action   = isset($_GET["action"]) ? (string)$_GET["action"] : "";

        if ($instance !== $this->InstanceID) {
            http_response_code(404);
            echo "Wrong instance";
            return;
        }
        if ($action !== "data") {
            http_response_code(400);
            echo "Unknown action";
            return;
        }

        // Zeitraum: HEUTE (lokal)
        $tz = new DateTimeZone(date_default_timezone_get());
        $startDT = new DateTime('today', $tz);
        $endDT   = new DateTime('tomorrow', $tz);

        $start = $startDT->getTimestamp();
        $end   = $endDT->getTimestamp();
        $now   = time();

        $forecast = $this->GetForecastSeriesFiltered($start, $end);
        $actual   = $this->GetActualSeriesFromArchive($start, $end, 1800, $now);

        $out = [
            "meta" => [
                "forecast_cached_at" => (int)$this->GetBuffer("ForecastTS"),
                "bucket_seconds" => 1800,
                "actual_is_watt" => (bool)$this->ReadPropertyBoolean("ActualIsWatt"),
                "start" => $start * 1000,
                "end" => $end * 1000,
                "now" => $now * 1000
            ],
            "series" => [
                "forecast" => $forecast,
                "actual" => $actual
            ]
        ];

        header("Content-Type: application/json; charset=utf-8");
        echo json_encode($out);
    }

    private function GetForecastSeriesFiltered(int $startTs, int $endTs): array
    {
        $raw = $this->GetBuffer("ForecastRaw");
        if ($raw === "") return [];

        $data = json_decode($raw, true);
        if (!is_array($data) || !isset($data["estimated_actuals"]) || !is_array($data["estimated_actuals"])) {
            return [];
        }

        $series = [];
        foreach ($data["estimated_actuals"] as $row) {
            if (!isset($row["period_end"], $row["pv_power_rooftop"])) continue;

            $ts = strtotime($row["period_end"]); // UTC korrekt
            if ($ts === false) continue;

            // nur HEUTE (lokal) anzeigen
            if ($ts < $startTs || $ts >= $endTs) continue;

            // Solcast: kW
            $val = (float)$row["pv_power_rooftop"];
            $series[] = [$ts * 1000, $val];
        }

        usort($series, fn($a, $b) => $a[0] <=> $b[0]);
        return $series;
    }

    private function GetActualSeriesFromArchive(int $startTs, int $endTs, int $bucketSeconds, int $nowTs): array
    {
        $varId = (int)$this->ReadPropertyInteger("ActualVariableID");
        if ($varId <= 0 || !IPS_VariableExists($varId)) return [];

        $archiveId = $this->GetArchiveInstanceID();
        if ($archiveId === 0) return [];

        if (!AC_GetLoggingStatus($archiveId, $varId)) {
            $this->SendDebug("Actual", "Variable wird nicht geloggt im Archiv", 0);
            return [];
        }

        $logged = AC_GetLoggedValues($archiveId, $varId, $startTs, $endTs, 0);
        if (!is_array($logged) || count($logged) === 0) return [];

        $buckets = []; // bucketEnd => [sum, count]
        foreach ($logged as $row) {
            if (!isset($row["TimeStamp"], $row["Value"])) continue;

            $ts = (int)$row["TimeStamp"];
            $bucketStart = intdiv($ts, $bucketSeconds) * $bucketSeconds;
            $bucketEnd = $bucketStart + $bucketSeconds;

            if ($bucketEnd < $startTs || $bucketEnd > $endTs) continue;

            if (!isset($buckets[$bucketEnd])) $buckets[$bucketEnd] = [0.0, 0];
            $buckets[$bucketEnd][0] += (float)$row["Value"];
            $buckets[$bucketEnd][1] += 1;
        }

        // Wir wollen ein sauberes 30-Minuten Raster über den ganzen Tag,
        // aber nach "jetzt" soll die Ist-Linie abbrechen (null).
        $series = [];
        $isWatt = (bool)$this->ReadPropertyBoolean("ActualIsWatt");

        for ($t = $startTs + $bucketSeconds; $t <= $endTs; $t += $bucketSeconds) {
            // Zukunft: null (Linie bricht)
            if ($t > $nowTs + $bucketSeconds) {
                $series[] = [$t * 1000, null];
                continue;
            }

            if (!isset($buckets[$t]) || $buckets[$t][1] <= 0) {
                $series[] = [$t * 1000, null];
                continue;
            }

            $avg = $buckets[$t][0] / $buckets[$t][1];

            // W -> kW, damit es zu Solcast passt
            if ($isWatt) $avg = $avg / 1000.0;

            $series[] = [$t * 1000, $avg];
        }

        return $series;
    }

    private function GetArchiveInstanceID(): int
    {
        $list = IPS_GetInstanceListByModuleID(self::ARCHIVE_GUID);
        return (is_array($list) && count($list) > 0) ? (int)$list[0] : 0;
    }
    
    private function HandleScheduledUpdate()
    {
        $mode = $this->ReadPropertyString("RefreshMode");

        if ($mode === "interval") {
            // 🔁 immer aktualisieren
            $this->UpdateForecast();
            return;
        }

        // ⏰ Tageszeit-Modus
        $targetSec = (int)$this->ReadPropertyInteger("RefreshTime");
        $now = time();

        // Sekunden seit Mitternacht
        $nowSec =
            (int)date("H", $now) * 3600 +
            (int)date("i", $now) * 60;

        // Schon heute gelaufen?
        $lastRun = (int)$this->GetBuffer("LastDailyRun");
        $today = strtotime("today");

        if ($nowSec >= $targetSec && $lastRun < $today) {
            $this->SendDebug("Scheduler", "Tägliches Update ausgelöst", 0);
            $this->UpdateForecast();
            $this->SetBuffer("LastDailyRun", (string)$now);
        }
    }


    private function RegisterHook(string $Hook)
    {
        $ids = IPS_GetInstanceListByModuleID("{015A6EB8-D6E5-4B93-B496-0D3FAD4D0E6E}");
        if (count($ids) === 0) return;

        $hookID = (int)$ids[0];
        $hooks = json_decode(IPS_GetProperty($hookID, "Hooks"), true);
        if (!is_array($hooks)) $hooks = [];

        foreach ($hooks as $h) {
            if (isset($h["Hook"]) && $h["Hook"] === $Hook) return;
        }

        $hooks[] = ["Hook" => $Hook, "TargetID" => $this->InstanceID];
        IPS_SetProperty($hookID, "Hooks", json_encode($hooks));
        IPS_ApplyChanges($hookID);
    }
}