function clamp(v, min, max) {
  return Math.min(Math.max(v, min), max);
}

function round1(v) {
  return Math.round(v * 10) / 10;
}

function round3(v) {
  return Math.round(v * 1000) / 1000;
}

function to2(n) {
  return String(n).padStart(2, '0');
}

function finiteOr(v, fallback) {
  return Number.isFinite(v) ? v : fallback;
}

function sigmoid(x) {
  return 1 / (1 + Math.exp(-x));
}

function alphaFromTau(dtSec, tauSec) {
  const dt = Math.max(1, finiteOr(dtSec, 60));
  const tau = Math.max(1, finiteOr(tauSec, 60));
  return Math.min(1, Math.max(0.001, 1 - Math.exp(-dt / tau)));
}

function ema(prev, sample, alpha) {
  if (!Number.isFinite(sample)) return Number.isFinite(prev) ? prev : 0;
  if (!Number.isFinite(prev)) return sample;
  return prev + alpha * (sample - prev);
}

function formatParisStampFromMs(ms) {
  const fmt = new Intl.DateTimeFormat('fr-FR', {
    timeZone: 'Europe/Paris',
    year: 'numeric',
    month: '2-digit',
    day: '2-digit',
    hour: '2-digit',
    minute: '2-digit',
    second: '2-digit',
    hour12: false,
  });

  const parts = Object.fromEntries(
    fmt.formatToParts(new Date(ms))
      .filter(p => p.type !== 'literal')
      .map(p => [p.type, p.value])
  );

  const hour = Number(parts.hour) === 24 ? 0 : Number(parts.hour);
  return `${parts.year}-${parts.month}-${parts.day} ${to2(hour)}:${parts.minute}:${parts.second}`;
}

const prev = $input.first().json;

const {
  now,
  nowMs,
  parsed,
  params,
  history,
  strategy,
  lifecycle,
  context,
  derived,
  locks,
  cloud,
  modes,
  safeguards,
  conditions,
  batteryTune,
  nightEvcs,
} = prev;

// =====================================================
// DECISION INIT
// =====================================================
let desiredCharging = false;
let desiredPermission = false;
let desiredLatch = false;
let desiredCurrentA = params.currentMinA;

let state = 'idle';
let currentDecision = 'hold';
let dynamicOk = false;
let mustStop = false;

let reason = [];

let setCloudDebtStartedAt = false;
let setProbeStartedAt = false;

// EVCS night session memory
let setNightSessionStart = false;
let clearNightSessionStart = false;

let notifyWanted = false;
let notifyTitle = 'Victron EVCS Surplus';
let notifyMessage = '';

let nextBlockReason = 'none';
let nextBlockedUntilStamp = now.stamp;

// =====================================================
// HELPERS
// =====================================================
function setOff({
  stateName,
  decisionName = 'stop',
  reasonText,
  dynamic = false,
  mustStopFlag = false,
  blockReason = 'none',
  blockedUntilStamp = now.stamp,
}) {
  desiredCharging = false;
  desiredPermission = false;
  desiredLatch = false;
  desiredCurrentA = params.currentMinA;

  state = stateName;
  currentDecision = decisionName;
  dynamicOk = dynamic;
  mustStop = mustStopFlag;
  nextBlockReason = blockReason;
  nextBlockedUntilStamp = blockedUntilStamp;

  if (reasonText) reason.push(reasonText);
}

function setOn({
  stateName,
  decisionName = 'hold',
  currentA = params.currentMinA,
  reasonText,
  dynamic = true,
  mustStopFlag = false,
}) {
  desiredCharging = true;
  desiredPermission = true;
  desiredLatch = true;
  desiredCurrentA = clamp(
    currentA,
    params.currentMinA,
    Math.max(params.currentMinA, derived.physicalCapA || params.currentMinA)
  );

  state = stateName;
  currentDecision = decisionName;
  dynamicOk = dynamic;
  mustStop = mustStopFlag;

  if (reasonText) reason.push(reasonText);
}

// =====================================================
// SESSION MEMORY SIDE EFFECTS
// =====================================================
if (nightEvcs?.nightSessionNeedsCapture) {
  setNightSessionStart = true;
}

if (nightEvcs?.nightSessionNeedsClear) {
  clearNightSessionStart = true;
}

// =====================================================
// EVCS NUMERIC NO-DEMAND FILTER
// Objectif:
// détecter "voiture branchée + session armée + commande claire
// mais plus de demande réelle" sans seuils fixes bruts.
// IMPORTANT:
// on n'utilise PAS le PV comme critère.
// =====================================================
const prevDeliveryRatioEma = finiteOr(history.evcsDeliveryRatioEma, NaN);
const prevDeliveryNoiseEma = finiteOr(history.evcsDeliveryNoiseEma, NaN);
const prevNoDemandScoreEma = finiteOr(history.evcsNoDemandScoreEma, NaN);
const prevNoDemandSemanticActive = !!history.evcsNoDemandSemanticActive;
const prevNoDemandSinceMs = finiteOr(history.evcsNoDemandSinceMs, NaN);
const prevNoDemandFilterEvalMs = finiteOr(history.evcsNoDemandFilterEvalMs, NaN);

const noDemandDtSec =
  Number.isFinite(prevNoDemandFilterEvalMs) && Number.isFinite(nowMs)
    ? clamp((nowMs - prevNoDemandFilterEvalMs) / 1000, 1, 600)
    : 60;

// Constantes dynamiques du filtre = temps de réponse du filtre,
// pas des seuils métiers bruts.
const deliveryTauSec = Math.max(15, finiteOr(params.evcsDeliveryTauSec, 45));
const noiseTauSec = Math.max(deliveryTauSec, finiteOr(params.evcsDeliveryNoiseTauSec, 180));
const scoreTauSec = Math.max(20, finiteOr(params.evcsNoDemandScoreTauSec, 150));
const armTauSec = Math.max(20, finiteOr(params.evcsNoDemandArmTauSec, 180));

const alphaDelivery = alphaFromTau(noDemandDtSec, deliveryTauSec);
const alphaNoise = alphaFromTau(noDemandDtSec, noiseTauSec);
const alphaScore = alphaFromTau(noDemandDtSec, scoreTauSec);

const acVoltageRef = finiteOr(derived.acVoltageRef, 230);

const commandCurrentA = clamp(
  finiteOr(
    derived.currentReferenceA,
    finiteOr(
      parsed.evcsCommandCurrentA,
      finiteOr(parsed.evcsSetCurrentA, finiteOr(params.currentMinA, 6))
    )
  ),
  0,
  32
);

const expectedPowerW = Math.max(1, commandCurrentA * acVoltageRef);

const realCurrentA = Math.abs(
  finiteOr(
    parsed.evcsCurrentRealA,
    acVoltageRef > 180
      ? finiteOr(parsed.evcsAcPowerW, 0) / acVoltageRef
      : 0
  )
);

const realPowerW = Math.max(0, finiteOr(parsed.evcsAcPowerW, 0));

const currentDeliveryRatioRaw = clamp(
  realCurrentA / Math.max(commandCurrentA, 0.1),
  0,
  1.25
);

const powerDeliveryRatioRaw = clamp(
  realPowerW / expectedPowerW,
  0,
  1.25
);

const deliveryRatioRaw = clamp(
  Math.max(currentDeliveryRatioRaw, powerDeliveryRatioRaw),
  0,
  1
);

const deliveryRatioEma = ema(prevDeliveryRatioEma, deliveryRatioRaw, alphaDelivery);

const deliveryResidualAbs = Math.abs(deliveryRatioRaw - deliveryRatioEma);
const deliveryNoiseEma = ema(prevDeliveryNoiseEma, deliveryResidualAbs, alphaNoise);

const adaptiveQuietBand = clamp(
  0.02 + 3.0 * deliveryNoiseEma,
  0.02,
  0.35
);

const noDemandEvidenceRaw = clamp(
  (adaptiveQuietBand - deliveryRatioEma) / adaptiveQuietBand,
  0,
  1
);

const sessionElapsedSec = Math.max(
  0,
  finiteOr(lifecycle.minutesSinceStart, 0) * 60
);

const sessionArmFactor = 1 - Math.exp(-sessionElapsedSec / armTauSec);

const currentMinRefA = Math.max(1, finiteOr(params.currentMinA, 6));
const commandStrength = commandCurrentA / currentMinRefA;

const commandFactor = clamp(
  sigmoid((commandStrength - 1.0) * 2.2),
  0,
  1
);