function minutesSince(ts, nowMs) {
  if (ts === null || nowMs === null) return null;
  return Math.max(0, (nowMs - ts) / 60000);
}

function secondsSince(ts, nowMs) {
  if (ts === null || nowMs === null) return null;
  return Math.max(0, (nowMs - ts) / 1000);
}

function isWithinWindow(nowMin, startMin, stopMin) {
  if (!Number.isFinite(startMin) || !Number.isFinite(stopMin)) return false;
  if (startMin === stopMin) return false;
  if (startMin < stopMin) return nowMin >= startMin && nowMin < stopMin;
  return nowMin >= startMin || nowMin < stopMin;
}

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

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

// =====================================================
// STRATEGY
// =====================================================
const userStrategy = (params.userStrategyRaw ?? 'auto_solar').toString().trim().toLowerCase();

const isStopMode = userStrategy === 'stop';
const forceGridRequested = userStrategy === 'force_grid_now';
const forceChargeRequested = userStrategy === 'force_charge_now';
const isForceMode = forceGridRequested || forceChargeRequested;

// =====================================================
// LIFECYCLE / TIMING
// =====================================================
const minutesSinceStart = minutesSince(history.lastStartMs, nowMs);
const minutesSinceStop = minutesSince(history.lastStopMs, nowMs);
const secondsSinceCurrentChange = secondsSince(history.lastCurrentChangeMs, nowMs);
const minutesSinceProbeStart = minutesSince(history.probeStartedMs, nowMs);

const minRunElapsed =
  minutesSinceStart === null ? true : minutesSinceStart >= params.minRunMinutes;

const minStopElapsed =
  minutesSinceStop === null ? true : minutesSinceStop >= params.minStopMinutes;

const currentCooldownBaseSec = parsed.evcsChargingSwitchOn
  ? batteryTune.global.stepDownCooldownSeconds
  : batteryTune.global.stepUpCooldownSeconds;

const currentCooldownElapsed =
  secondsSinceCurrentChange === null
    ? true
    : secondsSinceCurrentChange >= Math.max(
        params.currentChangeCooldownSeconds,
        currentCooldownBaseSec
      );

// =====================================================
// DEPARTURE PRIORITY
// =====================================================
const minutesUntilDeparture =
  params.departureTimeMin === null
    ? null
    : (() => {
        const rawDiff = params.departureTimeMin - now.minNow;
        return rawDiff >= 0 ? rawDiff : (1440 - now.minNow + params.departureTimeMin);
      })();

const departurePriorityActive =
  parsed.departurePriorityEnabled &&
  Number.isFinite(minutesUntilDeparture) &&
  minutesUntilDeparture >= 0 &&
  minutesUntilDeparture <= cfg.departurePriorityWindowMinutes &&
  parsed.evcsVehicleConnected;

// =====================================================
// EVCS PRIORITY OVERRIDE FOR FORCE CHARGE
// force_charge_now + voiture branchée + départ défini = grid_forced
// =====================================================
const forceChargeDepartureGridOverride =
  forceChargeRequested &&
  parsed.evcsVehicleConnected &&
  Number.isFinite(minutesUntilDeparture) &&
  minutesUntilDeparture >= 0;

// =====================================================
// SYSTEM DERIVED VALUES
// =====================================================
const acVoltageRef =
  Number.isFinite(parsed.vebusAcOutVoltageV) && parsed.vebusAcOutVoltageV > 180
    ? parsed.vebusAcOutVoltageV
    : cfg.nominalAcVoltageV;

const batteryVoltageRef =
  Number.isFinite(parsed.vebusDcVoltageV) && parsed.vebusDcVoltageV > 0
    ? parsed.vebusDcVoltageV
    : 51.2;

const houseNonEvcsW = Math.max(0, parsed.houseAcPowerW - parsed.evcsAcPowerW);
const vebusNonEvcsW = Math.max(0, parsed.vebusAcOutPowerW - parsed.evcsAcPowerW);

const totalVebusSoftCeilingW = Math.max(6500, params.acLoadsMaxSafeW || 8500);
const totalVebusHardCeilingW = totalVebusSoftCeilingW + 400;

const safeEvcsByDedicatedCapW = Math.max(0, cfg.evcsDedicatedMaxW - cfg.systemReserveW);
const safeEvcsByVebusW = Math.max(0, totalVebusSoftCeilingW - vebusNonEvcsW - cfg.systemReserveW);
const safeEvcsCombinedW = Math.max(0, Math.min(safeEvcsByDedicatedCapW, safeEvcsByVebusW));

const systemCapCurrentA = Math.max(0, Math.floor(safeEvcsCombinedW / acVoltageRef));
const physicalCapA = clamp(systemCapCurrentA, 0, params.currentMaxAutoA);
const canRunAtMinCurrent = physicalCapA >= params.currentMinA;

const endDayGuardSoc = Math.max(params.endOfDaySocGuard, params.endOfDaySocTarget);

const energyNeededForEndDayGuardKwh = Math.max(
  0,
  ((endDayGuardSoc - parsed.soc) / 100) * cfg.batteryUsableCapacityKwh
);

const forecastBufferKwh =
  parsed.todayRemainingKwh -
  params.baseLoadRemainingKwh -
  params.flexibleSafetyMarginKwh -
  params.requiredEnergyKwh -
  energyNeededForEndDayGuardKwh;

const projectedEndSocAfterCharge = clamp(
  parsed.soc + (
    (
      parsed.todayRemainingKwh -
      params.baseLoadRemainingKwh -
      params.flexibleSafetyMarginKwh -
      params.requiredEnergyKwh
    ) / cfg.batteryUsableCapacityKwh
  ) * 100,
  0,
  100
);

const currentReferenceA = clamp(
  Number.isFinite(parsed.evcsCommandCurrentA)
    ? parsed.evcsCommandCurrentA
    : Number.isFinite(parsed.evcsSetCurrentA)
      ? parsed.evcsSetCurrentA
      : params.targetCurrentAutoA,
  0,
  32
);

const anyVebusOverload = parsed.vebusOverload || parsed.vebusL1Overload;
const anyVebusLowBattery = parsed.vebusLowBattery || parsed.vebusL1LowBattery;

const vebusAcOutSoftReached = parsed.vebusAcOutPowerW >= totalVebusSoftCeilingW;
const vebusAcOutHardReached = parsed.vebusAcOutPowerW >= totalVebusHardCeilingW;

const vebusDcVoltageSoftLow =
  Number.isFinite(parsed.vebusDcVoltageV) &&
  parsed.vebusDcVoltageV > 0 &&
  parsed.vebusDcVoltageV <= cfg.vebusDcVoltageSoftFloorV;

const vebusDcVoltageHardLow =
  Number.isFinite(parsed.vebusDcVoltageV) &&
  parsed.vebusDcVoltageV > 0 &&
  parsed.vebusDcVoltageV <= cfg.vebusDcVoltageHardFloorV;

const houseLoadHighVsHeadroom = houseNonEvcsW > params.houseAcHeadroomW;

// =====================================================
// WINDOWS / PROFILE
// =====================================================
const inNightHcWindow = isWithinWindow(now.minNow, params.hcNightStartMin, params.hcNightStopMin);
const inMorningWindow = isWithinWindow(now.minNow, params.morningStartMin, params.morningStopMin);
const inMiddayWindow = isWithinWindow(now.minNow, params.hcMiddayStartMin, params.hcMiddayStopMin);
const inEveningWindow = isWithinWindow(now.minNow, params.eveningStartMin, params.eveningStopMin);

const profile =
  inNightHcWindow ? 'night_hc' :
  inMorningWindow ? 'morning_solar' :
  inMiddayWindow ? 'midday_hc_or_solar' :
  inEveningWindow ? 'evening_high_soc' :
  'outside_window';

// =====================================================
// EVCS NIGHT PREVIEW ENGINE
// =====================================================
const nightSessionActive =
  profile === 'night_hc' &&
  parsed.evcsVehicleConnected;

const nightSessionStartSocPct =
  nightSessionActive
    ? (
        Number.isFinite(history.nightSessionStartSocPct)
          ? history.nightSessionStartSocPct
          : parsed.soc
      )
    : null;

const nightSessionStartAt =
  nightSessionActive
    ? (history.nightSessionStartAt || '')
    : '';

const nightSessionNeedsCapture =
  nightSessionActive &&
  (
    !Number.isFinite(history.nightSessionStartSocPct) ||
    !history.nightSessionStartAt
  );

const nightSessionNeedsClear =
  !nightSessionActive &&
  (
    Number.isFinite(history.nightSessionStartSocPct) ||
    !!history.nightSessionStartAt
  );

const batteryHardFloorPct =
  params.evcsNightBatteryHardFloorPct;

const batteryMorningTargetPct =
  parsed.todayRemainingKwh >= params.evcsNightStrongForecastKwh
    ? params.evcsNightTargetStrongForecastPct
    : parsed.todayRemainingKwh >= params.evcsNightMediumForecastKwh
      ? params.evcsNightTargetMediumForecastPct
      : params.evcsNightTargetWeakForecastPct;

const maxBatteryDischargePoints =
  nightSessionActive && Number.isFinite(nightSessionStartSocPct)
    ? Math.max(0, nightSessionStartSocPct - batteryMorningTargetPct)
    : 0;

const gridTakeoverTriggerPct =
  Math.max(batteryHardFloorPct, batteryMorningTargetPct);

const batteryBelowHardFloor =
  parsed.soc <= batteryHardFloorPct;

const batteryBelowMorningTarget =
  parsed.soc < batteryMorningTargetPct;

const batteryAtOrBelowGridTakeoverTrigger =
  parsed.soc <= gridTakeoverTriggerPct;

const batteryKwhMissingToTarget =
  nightSessionActive
    ? Math.max(
        0,
        ((batteryMorningTargetPct - parsed.soc) / 100) * cfg.batteryUsableCapacityKwh
      )
    : 0;

const batteryRecoveryMinutesNeeded =
  nightSessionActive && params.evcsNightBatteryRecoveryPowerKw > 0
    ? (batteryKwhMissingToTarget / params.evcsNightBatteryRecoveryPowerKw) * 60
    : 0;

const batteryRecoveryUrgent =
  nightSessionActive &&
  Number.isFinite(minutesUntilDeparture) &&
  minutesUntilDeparture >= 0 &&
  (
    batteryRecoveryMinutesNeeded + params.evcsNightDepartureSafetyMin
      >= minutesUntilDeparture
  );

const batteryAssistAllowed =
  nightSessionActive &&
  parsed.soc > batteryHardFloorPct &&
  parsed.soc > gridTakeoverTriggerPct &&
  !batteryRecoveryUrgent;

const nightGridTakeoverNeeded =
  nightSessionActive &&
  (
    batteryBelowHardFloor ||
    batteryAtOrBelowGridTakeoverTrigger ||
    batteryRecoveryUrgent
  );

const nightPreferredSourceMode =
  !nightSessionActive
    ? 'blocked'
    : batteryAssistAllowed
      ? 'battery_assist_night'
      : (
          batteryBelowHardFloor ||
          batteryBelowMorningTarget ||
          batteryRecoveryUrgent
        )
        ? 'grid_forced'
        : 'grid_hc_allowed';