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

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

function getParisParts(ms = Date.now()) {
  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);
  const date = `${parts.year}-${parts.month}-${parts.day}`;

  return {
    date,
    hour,
    minute: Number(parts.minute),
    second: Number(parts.second),
  };
}

function getTzOffsetMs(utcTs, timeZone = 'Europe/Paris') {
  const dtf = new Intl.DateTimeFormat('en-US', {
    timeZone,
    year: 'numeric',
    month: '2-digit',
    day: '2-digit',
    hour: '2-digit',
    minute: '2-digit',
    second: '2-digit',
    hour12: false,
  });

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

  const asIfUtc = Date.UTC(
    Number(parts.year),
    Number(parts.month) - 1,
    Number(parts.day),
    Number(parts.hour) === 24 ? 0 : Number(parts.hour),
    Number(parts.minute),
    Number(parts.second)
  );

  const d = new Date(utcTs);
  const actualUtc = Date.UTC(
    d.getUTCFullYear(),
    d.getUTCMonth(),
    d.getUTCDate(),
    d.getUTCHours(),
    d.getUTCMinutes(),
    d.getUTCSeconds()
  );

  return asIfUtc - actualUtc;
}

function parseParisStampToMs(s) {
  const text = (s ?? '').toString().trim();
  const m = text.match(/^(\d{4})-(\d{2})-(\d{2}) (\d{2}):(\d{2}):(\d{2})$/);
  if (!m) return null;

  const y = Number(m[1]);
  const mo = Number(m[2]);
  const d = Number(m[3]);
  const h = Number(m[4]);
  const mi = Number(m[5]);
  const se = Number(m[6]);

  const guessUtc = Date.UTC(y, mo - 1, d, h, mi, se);
  const off1 = getTzOffsetMs(guessUtc, 'Europe/Paris');
  let ts = guessUtc - off1;
  const off2 = getTzOffsetMs(ts, 'Europe/Paris');

  if (off2 !== off1) ts = guessUtc - off2;
  return ts;
}

function hhmmssFromMinutes(minOfDay) {
  const mm = ((minOfDay % 1440) + 1440) % 1440;
  const hh = Math.floor(mm / 60);
  const mi = mm % 60;
  return `${to2(hh)}:${to2(mi)}:00`;
}

function nextDailyOccurrenceMs(startMin, refMs) {
  if (!Number.isFinite(startMin)) return null;

  const today = getParisParts(refMs).date;
  const todayStamp = `${today} ${hhmmssFromMinutes(startMin)}`;
  const todayMs = parseParisStampToMs(todayStamp);

  if (todayMs !== null && todayMs > refMs + 1000) return todayMs;

  const tomorrow = getParisParts(refMs + 36 * 3600 * 1000).date;
  const tomorrowStamp = `${tomorrow} ${hhmmssFromMinutes(startMin)}`;
  return parseParisStampToMs(tomorrowStamp);
}

const prev = $input.first().json;
const {
  nowMs,
  cfg,
  parsed,
  params,
  history,
  batteryTune,
  strategy,
  derived,
  context,
  lifecycle,
} = prev;

// =====================================================
// SESSION / SOURCE
// =====================================================
const sessionObservedActive =
  parsed.evcsChargingSwitchOn ||
  parsed.controlLatch ||
  parsed.chargePermissionNow;

const isGridSource =
  context.sourceMode === 'grid_hc_allowed' ||
  context.sourceMode === 'grid_forced';

// =====================================================
// SOC BAND / BATTERY DYNAMIC POLICY
// =====================================================
const socBand =
  parsed.soc > 90 ? 'gt90' :
  parsed.soc > 80 ? '80_90' :
  parsed.soc > 60 ? '60_80' :
  parsed.soc > 40 ? '40_60' :
  parsed.soc > 25 ? '25_40' :
  'lt25';

const band = batteryTune.bands[socBand];

const dischargeModeFactor =
  strategy.forceChargeRequested ? 1.2 :
  strategy.forceGridRequested ? 0.7 :
  strategy.userStrategy === 'auto_solar' ? 0.8 :
  1.0;

const chargeReserveModeFactor =
  strategy.forceChargeRequested ? 0.8 :
  strategy.forceGridRequested ? 1.1 :
  strategy.userStrategy === 'auto_solar' ? 1.1 :
  1.0;

const toleranceModeFactor =
  strategy.forceChargeRequested ? 1.25 :
  strategy.forceGridRequested ? 0.8 :
  strategy.userStrategy === 'auto_solar' ? 0.8 :
  1.0;

const batteryDischargeSoftDynamicA = band.dischargeSoftA * dischargeModeFactor;
const batteryDischargeHardDynamicA = band.dischargeHardA * dischargeModeFactor;
const batteryChargeReserveDynamicA = Math.max(0, band.chargeReserveA * chargeReserveModeFactor);
const batterySoftToleranceMinutes = band.softToleranceMin * toleranceModeFactor;
const batteryHardToleranceSeconds = band.hardToleranceSec;
const batteryRecoveryMinutes = band.recoveryMin;

// =====================================================
// CONTEXT HELPERS
// =====================================================
const houseSpikeThresholdW = 1500;
const houseSpikeDetected =
  (parsed.houseAcPowerW - parsed.houseAcPowerPrevW) >= houseSpikeThresholdW;

const solarPotentialContext =
  context.sourceMode === 'solar_potential' ||
  (
    parsed.soc >= 80 &&
    derived.forecastBufferKwh > 0 &&
    parsed.pvPowerW < context.effectivePvStartMinW &&
    derived.houseNonEvcsW < 1200
  );

// =====================================================
// REASON-BASED LOCKS
// =====================================================
const nextWindowCandidates = [
  nextDailyOccurrenceMs(params.morningStartMin, nowMs),
  nextDailyOccurrenceMs(params.hcMiddayStartMin, nowMs),
  nextDailyOccurrenceMs(params.eveningStartMin, nowMs),
  nextDailyOccurrenceMs(params.hcNightStartMin, nowMs),
].filter(v => Number.isFinite(v));

const nextAllowedWindowStartMs =
  nextWindowCandidates.length > 0 ? Math.min(...nextWindowCandidates) : null;

const blockActive =
  history.blockedUntilMs !== null &&
  history.blockedUntilMs > nowMs + 1000;

const blockStillRelevant =
  history.lastBlockReason === 'outside_window'
    ? context.profile === 'outside_window'
    : history.lastBlockReason === 'probe_failed'
      ? context.sourceMode === 'hybrid_probe'
      : history.lastBlockReason === 'battery_protection_stop'
        ? (
            parsed.batteryCurrentA < -params.batteryNeutralBandA ||
            derived.anyVebusLowBattery ||
            derived.vebusDcVoltageSoftLow
          )
        : history.lastBlockReason === 'grid_battery_guard'
          ? isGridSource
          : history.lastBlockReason === 'vebus_overload_persistent'
            ? derived.anyVebusOverload
            : false;

const startBlockedByReason = blockActive && blockStillRelevant;

// =====================================================
// CLOUD DEBT
// =====================================================
const batteryNetPowerW = parsed.batteryCurrentA * derived.batteryVoltageRef;
let cloudDebtNextKwh = params.cloudDebtPrevKwh;

if (sessionObservedActive) {
  if (batteryNetPowerW < 0 && !isGridSource) {
    cloudDebtNextKwh += (Math.abs(batteryNetPowerW) * cfg.sampleSeconds) / 3600000;
  } else if (batteryNetPowerW > 0) {
    cloudDebtNextKwh -= (batteryNetPowerW * cfg.sampleSeconds) / 3600000;
  }
} else if (batteryNetPowerW > 0) {
  cloudDebtNextKwh -= (batteryNetPowerW * cfg.sampleSeconds) / 3600000;
}

cloudDebtNextKwh = clamp(cloudDebtNextKwh, 0, params.cloudDebtMaxKwh * 4);

const cloudDebtMeaningful =
  cloudDebtNextKwh > cfg.cloudDebtMeaningfulThresholdKwh;

const cloudEventDischargingNow =
  sessionObservedActive &&
  !isGridSource &&
  parsed.batteryCurrentA < -Math.max(1, params.batteryNeutralBandA) &&
  cloudDebtMeaningful;

const continuingCloudEvent =
  cloudEventDischargingNow &&
  history.cloudDebtStartedMsPrev !== null &&
  params.cloudDebtPrevKwh > cfg.cloudDebtRecoveryThresholdKwh;

const enteringCloudDebt =
  cloudEventDischargingNow && !continuingCloudEvent;

const cloudDebtActive = cloudEventDischargingNow;

const cloudDebtStartedMs =
  cloudEventDischargingNow
    ? (continuingCloudEvent ? history.cloudDebtStartedMsPrev : nowMs)
    : null;

const cloudDebtDurationMinutes =
  cloudDebtActive && cloudDebtStartedMs !== null
    ? Math.max(0, (nowMs - cloudDebtStartedMs) / 60000)
    : 0;

const effectiveCloudToleranceMinutes =
  params.cloudToleranceMinutes +
  (solarPotentialContext ? batteryTune.global.solarPotentialGraceMinutes : 0) +
  (houseSpikeDetected ? batteryTune.global.houseSpikeGraceMinutes : 0);

const cloudToleranceOk =
  cloudDebtNextKwh <= params.cloudDebtMaxKwh &&
  (
    !cloudDebtActive ||
    cloudDebtDurationMinutes <= effectiveCloudToleranceMinutes
  );