<?php

class Bat_EV_SDL extends IPSModule
{
    /* ===========================
     * 1) Setup
     * =========================== */
    public function Create()
    {
        parent::Create();

        // ---- Properties (kommen aus form.json) ----
        $this->RegisterPropertyString("Batteries", "[]");     // List JSON
        $this->RegisterPropertyInteger("SDL_Leistung", 0);    // W

        // ---- Status / Steuerung ----
        $this->RegisterVariableBoolean("State", "Aktiv", "~Switch", 1);
        $this->EnableAction("State");

        // ---- Ergebnisse (Gesamt) ----
        $this->RegisterVariableFloat("kWh_SDL", "Energie SDL (kWh)", "", 10);
        $this->RegisterVariableFloat("kWh_EV",  "Energie EV (kWh)",  "", 11);

        $this->RegisterVariableFloat("SoC_SDL", "SoC SDL (%)", "", 12);
        $this->RegisterVariableFloat("SoC_EV",  "SoC EV (%)",  "", 13);

        $this->RegisterVariableFloat("P_SDL_max", "P SDL max (W)", "", 20);
        $this->RegisterVariableFloat("P_EV_max",  "P EV max (W)",  "", 21);

        // Optional: Voller JSON-Dump zum Debuggen/Weiterverarbeiten
        $this->RegisterVariableString("CalcJSON", "Berechnung (JSON)", "", 99);

        
    }

    /* ===========================
     * 2) ApplyChanges (Konsole speichern)
     * =========================== */
    public function ApplyChanges()
    {
        parent::ApplyChanges();


        // Sofort nach Speichern einmal rechnen
        $this->Update();
    }

    /* ===========================
     * 3) RequestAction (WebFront Klicks)
     * =========================== */
    public function RequestAction($Ident, $Value)
    {
        switch ($Ident) {
            case "State":
                SetValue($this->GetIDForIdent("State"), (bool)$Value);
                if ((bool)$Value) {
                    $this->Update();
                }
                break;

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

    /* ===========================
     * 4) Hauptlogik
     * =========================== */
    public function Update()
    {
        if (!GetValue($this->GetIDForIdent("State"))) {
            return;
        }

        $batteries = json_decode($this->ReadPropertyString("Batteries"), true);
        if (!is_array($batteries) || count($batteries) === 0) {
            $this->SendDebug("Update", "Keine Batterien konfiguriert.", 0);
            $this->WriteEmptyResults();
            return;
        }

        $sdlPowerW = (int)$this->ReadPropertyInteger("SDL_Leistung");
        $reserveH  = 0.5; // FIX: SDL muss immer 30 Minuten laden/entladen können

        // 1) Summe Max-Leistung aller Batterien
        $sumBatPowerW = 0;
        foreach ($batteries as $b) {
            $p = (int)($b["powerbat"] ?? 0);
            if ($p > 0) {
                $sumBatPowerW += $p;
            }
        }

        if ($sumBatPowerW <= 0) {
            $this->SendDebug("Update", "Summe powerbat ist 0 – bitte Leistungen setzen.", 0);
            $this->WriteEmptyResults();
            return;
        }

        // Optional: SDL nicht größer als physikalisch möglich
        if ($sdlPowerW > $sumBatPowerW) {
            $this->SendDebug("Update", "SDL_Leistung ($sdlPowerW W) > SummeBatPower ($sumBatPowerW W) -> begrenze.", 0);
            $sdlPowerW = $sumBatPowerW;
        }
        if ($sdlPowerW < 0) $sdlPowerW = 0;

        // Summen
        $sumSDLPowerW = 0.0;
        $sumEVPowerW  = 0.0;

        $sumSDLcapKWh = 0.0; // SDL-Topf Kapazität (Reserveenergie)
        $sumEVcapKWh  = 0.0; // EV-Topf Kapazität (Rest)

        $sumSDLkWh    = 0.0; // aktueller Füllstand SDL
        $sumEVkWh     = 0.0; // aktueller Füllstand EV

        $calc = [];

        // 2) Pro Batterie rechnen
        foreach ($batteries as $idx => $b) {

            $typ    = (string)($b["typ"] ?? ("Bat#" . ($idx + 1)));
            $pBatW  = (int)($b["powerbat"] ?? 0);
            $capKWh = (float)($b["capazity"] ?? 0);
            $socVar = (int)($b["soc"] ?? 0);

            if ($pBatW <= 0 || $capKWh <= 0) {
                $calc[] = [
                    "typ" => $typ,
                    "skip" => "powerbat<=0 oder capacity<=0"
                ];
                continue;
            }

            // SDL Anteil Leistung (W) proportional
            $pSDL_W_raw = ($sdlPowerW * $pBatW) / $sumBatPowerW;

            // Physikalisch kappen: pro Batterie nicht mehr als pBatW
            $pSDL_W = min($pSDL_W_raw, (float)$pBatW);
            if ($pSDL_W < 0) $pSDL_W = 0.0;

            // SDL Reserveenergie für 30 Minuten (kWh)
            $eSDLcap_kWh = ($pSDL_W * $reserveH) / 1000.0;

            // EV-Topf ist Rest der Kapazität
            $eEVcap_kWh = max(0.0, $capKWh - $eSDLcap_kWh);

            // SoC lesen (0..100 oder 0..1 -> wird umgerechnet)
            $socPct = $this->ReadSocPercent($socVar);

            // Gesamtenergie in der Batterie (kWh)
            $eTotal_kWh = ($socPct / 100.0) * $capKWh;

            // Aufteilung Energie: SDL zuerst füllen (damit SDL "sicher" ist)
            $eSDL_kWh = min($eTotal_kWh, $eSDLcap_kWh);
            $eEV_kWh  = max(0.0, $eTotal_kWh - $eSDL_kWh);

            // EV kann maximal eEVcap aufnehmen (sollte i.d.R. eh passen)
            if ($eEV_kWh > $eEVcap_kWh) {
                $eEV_kWh = $eEVcap_kWh;
            }

            // Power-Limits
            $pEV_W = max(0.0, $pBatW - $pSDL_W);

            // Summieren
            $sumSDLPowerW += $pSDL_W;
            $sumEVPowerW  += $pEV_W;

            $sumSDLcapKWh += $eSDLcap_kWh;
            $sumEVcapKWh  += $eEVcap_kWh;

            $sumSDLkWh    += $eSDL_kWh;
            $sumEVkWh     += $eEV_kWh;

            // Detail pro Batterie
            $calc[] = [
                "typ" => $typ,

                "pBat_W" => $pBatW,
                "cap_kWh" => round($capKWh, 3),
                "soc_pct" => round($socPct, 2),
                "eTotal_kWh" => round($eTotal_kWh, 3),

                "pSDL_W" => round($pSDL_W, 0),
                "eSDLcap_kWh" => round($eSDLcap_kWh, 3),
                "eSDL_kWh" => round($eSDL_kWh, 3),

                "eEVcap_kWh" => round($eEVcap_kWh, 3),
                "eEV_kWh" => round($eEV_kWh, 3),

                "pEV_W" => round($pEV_W, 0)
            ];
        }

        // 3) Gesamt-SoC für SDL/EV (bezogen auf jeweilige Topf-Kapazität)
        $socSDL = ($sumSDLcapKWh > 0.0) ? ($sumSDLkWh / $sumSDLcapKWh) * 100.0 : 0.0;
        $socEV  = ($sumEVcapKWh  > 0.0) ? ($sumEVkWh  / $sumEVcapKWh)  * 100.0 : 0.0;

        // 4) Setzen der Ergebnisvariablen
        SetValue($this->GetIDForIdent("kWh_SDL"), round($sumSDLkWh, 3));
        SetValue($this->GetIDForIdent("kWh_EV"),  round($sumEVkWh, 3));

        SetValue($this->GetIDForIdent("SoC_SDL"), round($socSDL, 2));
        SetValue($this->GetIDForIdent("SoC_EV"),  round($socEV, 2));

        SetValue($this->GetIDForIdent("P_SDL_max"), round($sumSDLPowerW, 0));
        SetValue($this->GetIDForIdent("P_EV_max"),  round($sumEVPowerW, 0));

        // 5) Debug / Buffer
        $out = [
            "SDL_W" => $sdlPowerW,
            "Reserve_h" => $reserveH,
            "SumBatPower_W" => $sumBatPowerW,

            "SumSDLcap_kWh" => round($sumSDLcapKWh, 3),
            "SumEVcap_kWh"  => round($sumEVcapKWh, 3),

            "SumSDL_kWh" => round($sumSDLkWh, 3),
            "SumEV_kWh"  => round($sumEVkWh, 3),

            "SoC_SDL_pct" => round($socSDL, 2),
            "SoC_EV_pct"  => round($socEV, 2),

            "P_SDL_max_W" => round($sumSDLPowerW, 0),
            "P_EV_max_W"  => round($sumEVPowerW, 0),

            "batteries" => $calc
        ];

        $json = json_encode($out, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT);
        SetValue($this->GetIDForIdent("CalcJSON"), $json);
        $this->SetBuffer("BatteryCalc", $json);

        $this->SendDebug("Update", $json, 0);
    }

    /* ===========================
     * 5) Helper
     * =========================== */

    /**
     * SoC in Prozent (0..100).
     * Akzeptiert 0..1 (wird *100) oder 0..100.
     */
    private function ReadSocPercent(int $varId): float
    {
        if ($varId <= 0 || !IPS_VariableExists($varId)) {
            return 0.0;
        }

        $v = GetValue($varId);
        if (!is_numeric($v)) {
            return 0.0;
        }

        $f = (float)$v;

        // 0..1 -> Prozent
        if ($f >= 0.0 && $f <= 1.0) {
            $f *= 100.0;
        }

        // Clamp
        if ($f < 0.0) $f = 0.0;
        if ($f > 100.0) $f = 100.0;

        return $f;
    }

    private function WriteEmptyResults()
    {
        SetValue($this->GetIDForIdent("kWh_SDL"), 0.0);
        SetValue($this->GetIDForIdent("kWh_EV"),  0.0);
        SetValue($this->GetIDForIdent("SoC_SDL"), 0.0);
        SetValue($this->GetIDForIdent("SoC_EV"),  0.0);
        SetValue($this->GetIDForIdent("P_SDL_max"), 0.0);
        SetValue($this->GetIDForIdent("P_EV_max"),  0.0);
        SetValue($this->GetIDForIdent("CalcJSON"), "{}");
        $this->SetBuffer("BatteryCalc", "{}");
    }
}