# Per-node module split

Where each concern lives **after** the refactor. All paths are relative
to `nodes/<nodeName>/src/`.

## Generic node template (any node post-refactor)

```
nodes/<name>/
  <name>.js                     # Node-RED entry: registerType + admin endpoints (≤ 50 lines)
  <name>.html                   # Form template + thin oneditprepare/oneditsave (≤ 250 lines)
  CONTRACT.md                   # Generated from commands/ + hand-written events
  examples/
    01-basic.json
    02-integration.json
    03-dashboard.json           # optional
  src/
    nodeClass.js                # extends BaseNodeAdapter; ~25 lines
    specificClass.js            # extends BaseDomain; orchestrator only; ~150 lines
    editor.js                   # client-side JS for HTML, served via admin endpoint (only if non-trivial UI)
    commands/
      index.js                  # the command registry array
      handlers.js               # the handler functions
    <concern>/                  # one folder per domain concern (see per-node sections below)
      ...
  test/
    basic/
    integration/
    edge/
```

## pumpingStation (Process Cell — L5, `#0c99d9`)

```
src/
  nodeClass.js                          # ~25 lines, extends BaseNodeAdapter
  specificClass.js                      # ~150 lines, orchestrator
  editor.js                             # extracted SVG/redraw logic from the .html (~260 lines)
  commands/
    index.js                            # set.mode | set.demand | set.inflow | calibrate.* | child.register
    handlers.js
  basin/
    BasinGeometry.js                    # initBasinProperties + level<->volume conversions
    thresholdValidator.js               # _validateThresholdOrdering — pure function
  measurement/
    flowAggregator.js                   # _selectBestNetFlow + _updatePredictedVolume + _computeRemainingTime + _levelRate + _deriveDirection
    measurementRouter.js                # _handleMeasurement + _onLevelMeasurement + _onPressureMeasurement
    calibration.js                      # calibratePredictedVolume + calibratePredictedLevel + setManualInflow
  control/
    levelBased.js                       # _controlLevelBased + _scaleLevelToFlowPercent + _applyMachineGroupLevelControl
    flowBased.js                        # placeholder for the flow mode; clearly stubbed
    manual.js                           # forwardDemandToChildren
    index.js                            # { 'levelbased': ..., 'flowbased': ..., 'manual': ... }
  safety/
    safetyController.js                 # evaluate() — split internally into dryRunRule + overfillRule
  io/
    statusBadge.js                      # getStatusBadge composition (was nodeClass._updateNodeStatus)
    output.js                           # getOutput, mostly a pass-through to measurements + basin snapshot
  configBuilder.js                      # extracted _loadConfig mapping
examples/
  standalone-demo.js                    # extracted from the bottom of specificClass.js
```

## measurement (Control Module — L2, `#a9daee`)

The good news: `Channel.js` already exists and is pure. Most of the
analog mode in `specificClass.js` is duplication that vanishes when the
analog path also goes through `Channel`.

```
src/
  nodeClass.js                          # extends BaseNodeAdapter
  specificClass.js                      # ~150 lines, orchestrator over modes
  channel/
    Channel.js                          # KEEP — already clean, the model for everything else
  modes/
    analogMode.js                       # one Channel built from flat config; routes msg.payload number
    digitalMode.js                      # N channels from config.channels[]; routes msg.payload object
    index.js                            # { analog, digital }
  simulation/
    simulator.js                        # simulateInput — random walk over the configured range
  calibration/
    calibrator.js                       # calibrate + isStable + standardDeviation helpers (drop duplicates of the static helpers in Channel)
  commands/
    index.js                            # set.simulator | set.outlierDetection | cmd.calibrate | data.measurement
    handlers.js
```

`statistics/` (mean/stdDev/median/etc.) — promote to
`generalFunctions/src/stats/`. Both `Channel.static helpers` and the
calibrator use them.

## machineGroupControl (Unit — L4, `#50a8d9`)

```
src/
  nodeClass.js                          # extends BaseNodeAdapter
  specificClass.js                      # ~200 lines orchestrator; tick/handlePressureChange/handleInput
  groupOps/
    groupOperatingPoint.js              # _equalizeOperatingPoint, _readChildMeasurement, _writeMeasurement
    groupCurves.js                      # _groupFlow, _groupPower, _groupNCog, _groupCalcPower
  totals/
    totalsCalculator.js                 # calcDynamicTotals, calcAbsoluteTotals, activeTotals
  combinatorics/
    pumpCombinations.js                 # validPumpCombinations + checkSpecialCases
  optimizer/
    bestCombination.js                  # calcBestCombination (CoG-based)
    bepGravitation.js                   # calcBestCombinationBEPGravitation + redistributeFlowBySlope + estimateSlopesAtBEP
    index.js                            # picks the optimizer by config
  efficiency/
    groupEfficiency.js                  # calcGroupEfficiency + calcDistanceBEP + helpers
  dispatch/
    demandDispatcher.js                 # uses LatestWinsGate; handleInput + per-machine fanout
  registration/                         # auto via ChildRouter — file may be tiny
  commands/
    index.js                            # set.mode | set.scaling | set.demand | child.register
    handlers.js
```

## rotatingMachine (Equipment Module — L3, `#86bbdd`)

The biggest specificClass (1760 lines). The split mirrors the natural
boundaries the existing comments suggest.

```
src/
  nodeClass.js                          # extends BaseNodeAdapter
  specificClass.js                      # ~250 lines orchestrator
  curves/
    curveLoader.js                      # loadCurve wrapper + model resolution
    curveNormalizer.js                  # _normalizeMachineCurve + _normalizeCurveSection (unit conversion + anomaly detection)
    reverseCurve.js                     # the existing reverseCurve helper
  prediction/
    predictors.js                       # owns predictFlow / predictPower / predictCtrl (delegates to generalFunctions/predict)
    groupPredictors.js                  # group-scope predictors used when an MGC parent calls setGroupOperatingPoint
    operatingPoint.js                   # current operating point: pressure source, derived flow & power
  drift/
    driftAssessor.js                    # _updateMetricDrift + assessDrift + _applyDriftPenalty
    predictionHealth.js                 # composes flow/power/pressure drift into a HealthStatus
  pressure/
    virtualChildren.js                  # _initVirtualPressureChildren + dashboard-sim children
    pressureInitialization.js           # getPressureInitializationStatus + tracking real children
    pressureRouter.js                   # updateMeasuredPressure + per-position handling
  state/                                # adapter to generalFunctions/state — thin glue, lifecycle hooks
    stateBindings.js                    # the position/state event handlers that fire _updateState etc.
  measurement/
    measurementHandlers.js              # updateMeasured{Flow,Power,Temperature} + _callMeasurementHandler
  flow/
    flowController.js                   # handleInput dispatch by source/action/parameter — feeds state machine
  display/
    workingCurves.js                    # showWorkingCurves + showCoG (admin endpoints)
  commands/
    index.js                            # set.mode | cmd.startup | cmd.shutdown | cmd.estop | cmd.setpoint | cmd.flow-setpoint | data.simulate-measurement | query.curves | query.cog
    handlers.js
```

## remaining nodes (skeleton — they get the platform refactor only)

| Node | Notes |
|---|---|
| `valve` | Equipment Module. Smaller than rotatingMachine — concern split likely just `state/`, `commands/`, `position/`. |
| `valveGroupControl` | Unit. Similar to MGC but no flow-power optimization — straightforward `position-aggregator` + `commands/`. |
| `reactor` | Unit. Domain is biological kinetics (ASM); will need a `kinetics/` folder. Big — second-tier candidate for deeper split. |
| `settler` | Unit. Has the recently-fixed `_connectReactor` integration; keep that wired through `ChildRouter`. |
| `monster` | Unit. Multi-parameter monitoring; the parameter set itself is config-driven. |
| `diffuser` | Equipment Module. Aeration controller. Likely small. |
| `dashboardAPI` | Utility. InfluxDB endpoints. Likely no `BaseDomain` — it's a passive HTTP server. |

The "skeleton" refactor for these is just:
- Convert `nodeClass.js` to extend `BaseNodeAdapter`.
- Convert `specificClass.js` to extend `BaseDomain`.
- Move the input switch to `commands/`.
- Add `getStatusBadge()` if not present.
- Use `ChildRouter` for registration.
- File splits driven by file size — if `specificClass` < 300 lines, leave it alone for now.

## generalFunctions itself

```
src/
  configs/                              # unchanged — JSON schemas per node
  helper/                               # eventually split into infra/ + domain/, but not in this refactor
  measurements/                         # MeasurementContainer — unchanged
  nodered/                              # NEW — node-RED-side infra
    BaseNodeAdapter.js
    commandRegistry.js
    statusBadge.js                      # composition helpers
    statusUpdater.js                    # the 1 Hz status-loop wrapper
    index.js
  domain/                               # NEW — domain-side infra
    BaseDomain.js
    UnitPolicy.js
    ChildRouter.js
    LatestWinsGate.js
    HealthStatus.js
    index.js
  stats/                                # NEW — promoted from measurement (mean, std, median, mad, lerp)
    index.js
```

Existing exports (`logger`, `configManager`, `outputUtils`,
`MeasurementContainer`, `predict`, `interpolation`, `state`, …) stay
exactly where they are. Imports keep working unchanged.

`generalFunctions/index.js` adds new exports alongside existing ones.
Nothing is removed in this refactor.