'use strict';

// rotatingMachine — S88 Equipment Module domain orchestrator.
//
// All heavy lifting lives in concern modules under src/{curves,prediction,
// drift,pressure,state,measurement,flow,display,io,commands}. This file
// stitches them together and preserves the public API the existing test
// suite + sibling nodes (MGC, pumpingStation) depend on.

const { BaseDomain, UnitPolicy, state, nrmse, interpolation, convert, assetResolver } = require('generalFunctions');

const { loadModelCurve } = require('./curves/curveLoader');
const { normalizeMachineCurve } = require('./curves/curveNormalizer');
const { reverseCurve } = require('./curves/reverseCurve');
const { buildPredictors } = require('./prediction/predictors');
const { buildGroupPredictors } = require('./prediction/groupPredictors');
const pmath = require('./prediction/predictionMath');
const eff = require('./prediction/efficiencyMath');
const DriftAssessor = require('./drift/driftAssessor');
const healthRefresh = require('./drift/healthRefresh');
const VirtualPressureChildren = require('./pressure/virtualChildren');
const PressureInitialization = require('./pressure/pressureInitialization');
const PressureRouter = require('./pressure/pressureRouter');
const { getMeasuredPressure } = require('./pressure/pressureSelector');
const { bindStateEvents, isOperationalState } = require('./state/stateBindings');
const sequence = require('./state/sequenceController');
const MeasurementHandlers = require('./measurement/measurementHandlers');
const { registerMeasurementChild, detachAllListeners } = require('./measurement/childRegistrar');
const FlowController = require('./flow/flowController');
const display = require('./display/workingCurves');
const io = require('./io/output');

class Machine extends BaseDomain {
  static name = 'rotatingMachine';

  static unitPolicy = UnitPolicy.declare({
    canonical: { pressure: 'Pa', atmPressure: 'Pa', flow: 'm3/s', power: 'W', temperature: 'K' },
    output:    { pressure: 'mbar', flow: 'm3/h', power: 'kW', temperature: 'C', atmPressure: 'Pa' },
    curve:     { pressure: 'mbar', flow: 'm3/h', power: 'kW', control: '%' },
    requireUnitForTypes: ['pressure', 'flow', 'power', 'temperature', 'atmPressure'],
  });

  // ES6 forbids `this` before super(). Single-threaded JS means stashing
  // on the class itself between the caller's args and super() is race-free;
  // configure() picks the extras up immediately after.
  //
  // Two call sites exist:
  //   - nodeClass.buildDomainConfig() pre-sets Machine._pendingExtras and
  //     then BaseNodeAdapter calls `new Machine(this.config)` (single-arg).
  //   - Tests / direct callers pass (machineConfig, stateConfig, errMetrics)
  //     explicitly.
  // With default-param `stateConfig={}`, the single-arg path was silently
  // clobbering the pre-set extras with an empty object, so the state machine
  // booted with schema defaults (warmingup=5s, speed=1%/s, mode=dynspeed)
  // regardless of what the editor saved. Only overwrite when an explicit
  // value is provided.
  constructor(machineConfig = {}, stateConfig, errorMetricsConfig) {
    if (stateConfig !== undefined || errorMetricsConfig !== undefined) {
      Machine._pendingExtras = {
        stateConfig: stateConfig ?? {},
        errorMetricsConfig: errorMetricsConfig ?? {},
      };
    }
    super(machineConfig);
  }

  configure() {
    const extras = Machine._pendingExtras || {};
    Machine._pendingExtras = null;

    this.interpolation = new interpolation();
    this.config = this.configUtils.updateConfig(this.config, {
      general: { name: `${this.config.functionality?.softwareType}_${this.config.general.id}` },
    });

    this._setupCurves();
    this.groupPredictFlow = null; this.groupPredictPower = null; this.groupPredictCtrl = null; this.groupNCog = 0;
    this._setupState(extras);
    this._setupDrift();
    this._setupPressure();
    this._setupChildren();
  }

  _setupCurves() {
    this.model = this.config.asset?.model;
    // Resolve derived metadata (supplier / type / allowed units) from the asset
    // registry. Source of truth lives in generalFunctions/datasets/assetData/.
    // If the registry has no entry for this model, assetMetadata is null and
    // we'll error out with a clear message below.
    this.assetMetadata = this.model
      ? assetResolver.resolveAssetMetadata('rotatingmachine', this.model)
      : null;

    if (!this.model) {
      this.logger.error(`rotatingMachine: asset.model is required. Open the node, pick a model from the asset menu, and save.`);
      this._installNullPredictors();
      return;
    }
    if (!this.assetMetadata) {
      this.logger.error(`rotatingMachine: model '${this.model}' not found in asset registry (datasets/assetData/rotatingmachine.json). Cannot derive supplier/type/units.`);
      this._installNullPredictors();
      return;
    }
    // Validate the chosen deployment unit. Hard check: it must be a recognised
    // flow unit (convert() can describe it). Soft check: warn if it isn't in
    // the registry's allowed-set for this model — the list is the editor's
    // recommended dropdown, not an exhaustive whitelist.
    const chosenUnit = this.config.asset?.unit;
    if (!chosenUnit) {
      this.logger.error(`rotatingMachine: asset.unit is required for model '${this.model}'. Re-save the node from the editor.`);
      this._installNullPredictors();
      return;
    }
    try {
      const desc = convert().describe(chosenUnit);
      if (desc.measure !== 'volumeFlowRate') {
        this.logger.error(`rotatingMachine: asset.unit '${chosenUnit}' is not a flow unit (got measure '${desc.measure}').`);
        this._installNullPredictors();
        return;
      }
    } catch (_) {
      this.logger.error(`rotatingMachine: asset.unit '${chosenUnit}' is not a recognised unit.`);
      this._installNullPredictors();
      return;
    }
    const allowedUnits = this.assetMetadata.units || [];
    if (allowedUnits.length > 0 && !allowedUnits.includes(chosenUnit)) {
      this.logger.warn(
        `rotatingMachine: asset.unit '${chosenUnit}' is not in the registry's recommended list ` +
        `for model '${this.model}' (allowed: [${allowedUnits.join(', ')}]). Continuing — the unit is a valid flow unit.`,
      );
    }

    const { rawCurve, error } = loadModelCurve(this.model);
    this.rawCurve = rawCurve;
    if (error) { this.logger.error(`${error} in machineConfig. Cannot make predictions.`); this._installNullPredictors(); return; }
    try {
      this.curve = normalizeMachineCurve(rawCurve, this.unitPolicy, this.logger);
      this.config = this.configUtils.updateConfig(this.config, { asset: { ...this.config.asset, machineCurve: this.curve } });
      const built = buildPredictors(this.config.asset.machineCurve);
      this.predictors = built;
      this.predictFlow = built.predictFlow; this.predictPower = built.predictPower; this.predictCtrl = built.predictCtrl;
      this.hasCurve = true;
    } catch (e) {
      this.logger.error(`Curve normalization failed for model '${this.model}': ${e.message}`);
      this._installNullPredictors();
    }
  }

  _installNullPredictors() {
    this.predictFlow = null; this.predictPower = null; this.predictCtrl = null;
    this.predictors = { predictFlow: null, predictPower: null, predictCtrl: null };
    this.hasCurve = false;
  }

  _setupState(extras) {
    this.state = new state(extras.stateConfig || {}, this.logger);
    this.errorMetrics = new nrmse(extras.errorMetricsConfig || {}, this.logger);
    this.currentMode = this.config.mode.current;
    this.currentEfficiencyCurve = {};
    this.cog = 0; this.NCog = 0; this.cogIndex = 0;
    this.minEfficiency = 0; this.absDistFromPeak = 0; this.relDistFromPeak = 0;
    this._stateUnbind = bindStateEvents({
      state: this.state,
      onPositionChange: () => this.updatePosition(),
      onStateChange: () => this._updateState(),
    });
  }

  _setupDrift() {
    this.driftProfiles = {
      flow:  { windowSize: 30, minSamplesForLongTerm: 10, ewmaAlpha: 0.15, alignmentToleranceMs: 2500, strictValidation: true },
      power: { windowSize: 30, minSamplesForLongTerm: 10, ewmaAlpha: 0.15, alignmentToleranceMs: 2500, strictValidation: true },
    };
    this.errorMetrics.registerMetric('flow', this.driftProfiles.flow);
    this.errorMetrics.registerMetric('power', this.driftProfiles.power);
    this.flowDrift = null; this.powerDrift = null;
    this.pressureDrift = { level: 0, flags: ['nominal'], source: null };
    this.predictionHealth = { quality: 'invalid', confidence: 0, pressureSource: null, flags: ['not_initialized'] };
    this.driftAssessor = new DriftAssessor({
      errorMetrics: this.errorMetrics,
      measurements: this.measurements,
      driftProfiles: this.driftProfiles,
      logger: this.logger,
      resolveProcessRange: (m, p, q) => this._resolveProcessRangeForMetric(m, p, q),
      measurementPositionForMetric: (m) => this._measurementPositionForMetric(m),
    });
  }

  _setupPressure() {
    this.virtualPressureChildIds = { upstream: 'dashboard-sim-upstream', downstream: 'dashboard-sim-downstream' };
    this.realPressureChildIds = { upstream: new Set(), downstream: new Set() };
    this.virtualPressureChildren = new VirtualPressureChildren({
      logger: this.logger, unitPolicy: this.unitPolicy, parentRef: this,
      ids: this.virtualPressureChildIds,
    }).build();
    this.pressureInit = new PressureInitialization({
      measurements: this.measurements,
      virtualPressureChildIds: this.virtualPressureChildIds,
      realPressureChildIds: this.realPressureChildIds,
      logger: this.logger,
    });
    this.pressureRouter = new PressureRouter({
      measurements: this.measurements,
      virtualPressureChildIds: this.virtualPressureChildIds,
      resolveMeasurementUnit: (t, u) => this._resolveMeasurementUnit(t, u),
      updatePosition: () => this.updatePosition(),
      refreshDrift: () => this._updatePressureDriftStatus(),
      refreshHealth: () => this._updatePredictionHealth(),
      getPressure: () => this.getMeasuredPressure(),
      logger: this.logger,
    });
  }

  _setupChildren() {
    this.child = this.child || {};
    this.childMeasurementListeners = new Map();
    this.measurementHandlers = new MeasurementHandlers({ host: this, logger: this.logger });
    this.flowController = new FlowController({ host: this, logger: this.logger });
    this.registerChild = (child, softwareType) => registerMeasurementChild(this, child, softwareType);

    this._init();
    this.registerChild(this.virtualPressureChildren.upstream, 'measurement');
    this.registerChild(this.virtualPressureChildren.downstream, 'measurement');
  }

  _init() {
    const tu = this.unitPolicy.output.temperature;
    this.measurements.type('temperature').variant('measured').position('atEquipment').value(15, Date.now(), tu);
    this.measurements.type('atmPressure').variant('measured').position('atEquipment').value(101325, Date.now(), 'Pa');
    const fu = this.unitPolicy.canonical.flow;
    const fmin = this.predictFlow ? this.predictFlow.currentFxyYMin : 0;
    const fmax = this.predictFlow ? this.predictFlow.currentFxyYMax : 0;
    this.measurements.type('flow').variant('predicted').position('max').value(fmax, Date.now(), fu);
    this.measurements.type('flow').variant('predicted').position('min').value(fmin, Date.now(), fu);
  }

  _callMeasurementHandler(measurementType, value, position, context = {}) {
    return this.measurementHandlers.dispatch(measurementType, value, position, context);
  }

  // ── unit helpers ────────────────────────────────────────────────────
  isUnitValidForType(type, unit) { return this.measurements?.isUnitCompatible?.(type, unit) === true; }
  _resolveMeasurementUnit(type, providedUnit) {
    const u = typeof providedUnit === 'string' ? providedUnit.trim() : '';
    if (!u) throw new Error(`Missing unit for ${type} measurement.`);
    if (!this.isUnitValidForType(type, u)) throw new Error(`Unsupported unit '${u}' for ${type} measurement.`);
    return u;
  }
  _convertUnitValue(value, from, to, ctx = 'unit conversion') {
    const n = Number(value);
    if (!Number.isFinite(n)) throw new Error(`${ctx}: value '${value}' is not finite`);
    if (!from || !to || from === to) return n;
    return convert(n).from(from).to(to);
  }
  _measurementPositionForMetric(metricId) { return metricId === 'power' ? 'atEquipment' : 'downstream'; }
  _resolveProcessRangeForMetric(metricId, predicted, measured) {
    let processMin = NaN; let processMax = NaN;
    if (metricId === 'flow')      { processMin = Number(this.predictFlow?.currentFxyYMin);  processMax = Number(this.predictFlow?.currentFxyYMax); }
    else if (metricId === 'power'){ processMin = Number(this.predictPower?.currentFxyYMin); processMax = Number(this.predictPower?.currentFxyYMax); }
    if (!Number.isFinite(processMin) || !Number.isFinite(processMax) || processMax <= processMin) {
      const p = Number(predicted); const m = Number(measured);
      const lo = Math.min(p, m); const hi = Math.max(p, m);
      processMin = Number.isFinite(lo) ? lo : 0;
      processMax = Number.isFinite(hi) && hi > processMin ? hi : processMin + 1;
    }
    return { processMin, processMax };
  }

  _updateMetricDrift(metricId, measuredValue, context = {}) {
    const drift = this.driftAssessor.updateMetricDrift(metricId, measuredValue, context);
    if (drift && drift.valid) {
      if (metricId === 'flow') this.flowDrift = drift;
      if (metricId === 'power') this.powerDrift = drift;
    }
    return drift;
  }
  assessDrift(measurement, processMin, processMax) { return this.driftAssessor.assessDrift(measurement, processMin, processMax); }
  _applyDriftPenalty(drift, confidence, flags, prefix) { return this.driftAssessor.applyDriftPenalty(drift, confidence, flags, prefix); }
  _isOperationalState() { return isOperationalState(this.state); }

  // ── pressure ───────────────────────────────────────────────────────
  _getPreferredPressureValue(position) { return this.pressureInit.getPreferredValue(position); }
  getPressureInitializationStatus()    { return this.pressureInit.getStatus(); }
  getMeasuredPressure()                { return getMeasuredPressure(this); }
  _updatePressureDriftStatus()         { return healthRefresh.updatePressureDriftStatus(this); }
  _updatePredictionHealth()            { return healthRefresh.updatePredictionHealth(this); }

  // ── measurement updaters (delegate to handlers) ────────────────────
  updateMeasuredPressure(value, position, context = {}) { this.pressureRouter.route(position, value, context); }
  updateMeasuredFlow(value, position, context = {})        { return this.measurementHandlers.updateMeasuredFlow(value, position, context); }
  updateMeasuredPower(value, position, context = {})       { return this.measurementHandlers.updateMeasuredPower(value, position, context); }
  updateMeasuredTemperature(value, position, context = {}) { return this.measurementHandlers.updateMeasuredTemperature(value, position, context); }
  updateSimulatedMeasurement(type, position, value, context = {}) {
    return this.measurementHandlers.updateSimulatedMeasurement(type, position, value, context);
  }
  handleMeasuredFlow()  { return this.measurementHandlers.handleMeasuredFlow(); }
  handleMeasuredPower() { return this.measurementHandlers.handleMeasuredPower(); }

  // ── state-machine driven recompute ─────────────────────────────────
  _updateState() {
    if (!this._isOperationalState()) {
      const fu = this.unitPolicy.canonical.flow;
      const pu = this.unitPolicy.canonical.power;
      this.measurements.type('flow').variant('predicted').position('downstream').value(0, Date.now(), fu);
      this.measurements.type('flow').variant('predicted').position('atEquipment').value(0, Date.now(), fu);
      this.measurements.type('power').variant('predicted').position('atEquipment').value(0, Date.now(), pu);
    }
    this._updatePredictionHealth();
    // Push port 0 deltas so downstream dashboards / probes see state +
    // predicted-flow updates as they happen. BaseNodeAdapter listens for
    // 'output-changed' on this.emitter to fire _emitOutputs().
    this.notifyOutputChanged();
  }

  updatePosition() {
    if (this._isOperationalState()) {
      const x = this.state.getCurrentPosition();
      const { cPower, cFlow } = this.calcFlowPower(x);
      const efficiency = this.calcEfficiency(cPower, cFlow, 'predicted');
      const { cog, minEfficiency } = this.calcCog();
      this.calcDistanceBEP(efficiency, cog, minEfficiency);
    }
    this._updatePredictionHealth();
    this.notifyOutputChanged();
  }

  // ── mode + input dispatch ──────────────────────────────────────────
  isValidSourceForMode(source, mode) {
    const ok = (this.config.mode.allowedSources[mode] || []).has(source);
    if (ok) this.logger.debug(`source is allowed proceeding with ${source} for mode ${mode}`);
    else    this.logger.warn(`${source} is not allowed in mode ${mode}`);
    return ok;
  }
  isValidActionForMode(action, mode) {
    const ok = (this.config.mode.allowedActions[mode] || []).has(action);
    if (ok) this.logger.debug(`Action is allowed proceeding with ${action} for mode ${mode}`);
    else    this.logger.warn(`${action} is not allowed in mode ${mode}`);
    return ok;
  }
  handleInput(source, action, parameter) { return this.flowController.handle(source, action, parameter); }
  abortMovement(reason = 'group override') { if (this.state?.abortCurrentMovement) this.state.abortCurrentMovement(reason); }
  setMode(newMode) {
    const allowed = this.defaultConfig.mode.current.rules.values.map((v) => v.value);
    if (!allowed.includes(newMode)) { this.logger.warn(`Invalid mode '${newMode}'. Allowed modes are: ${allowed.join(', ')}`); return; }
    this.currentMode = newMode;
    this.logger.info(`Mode successfully changed to '${newMode}'.`);
  }
  updateConfig(newConfig) { this.config = this.configUtils.updateConfig(this.config, newConfig); }
  _waitForOperational(t)   { return sequence.waitForOperational(this, t); }
  executeSequence(name)    { return sequence.executeSequence(this, name); }
  setpoint(target)         { return sequence.setpoint(this, target); }
  _resolveSetpointBounds() { return sequence.resolveSetpointBounds(this); }

  // ── curve-driven prediction (delegates) ────────────────────────────
  calcFlow(x)            { return pmath.calcFlow(this, x); }
  calcPower(x)           { return pmath.calcPower(this, x); }
  calcCtrl(x)            { return pmath.calcCtrl(this, x); }
  inputFlowCalcPower(f)  { return pmath.inputFlowCalcPower(this, f); }
  calcFlowPower(x)       { return { cFlow: this.calcFlow(x), cPower: this.calcPower(x) }; }

  // ── group-scope operating point (MGC) ──────────────────────────────
  _ensureGroupPredicts() {
    if (!this.hasCurve || !this.predictFlow || !this.predictPower || !this.predictCtrl) return;
    if (this.groupPredictFlow && this.groupPredictPower && this.groupPredictCtrl) return;
    const built = buildGroupPredictors(this.predictors);
    if (!built) return;
    this.groupPredictFlow = built.groupPredictFlow;
    this.groupPredictPower = built.groupPredictPower;
    this.groupPredictCtrl = built.groupPredictCtrl;
  }
  setGroupOperatingPoint(downstreamPa, upstreamPa) {
    this._ensureGroupPredicts();
    if (!this.groupPredictFlow || !this.groupPredictPower) return;
    if (!Number.isFinite(downstreamPa) || !Number.isFinite(upstreamPa)) return;
    const diff = downstreamPa - upstreamPa;
    if (diff <= 0) return;
    this.groupPredictFlow.fDimension = diff;
    this.groupPredictPower.fDimension = diff;
    if (this.groupPredictCtrl) this.groupPredictCtrl.fDimension = diff;
    this.groupNCog = this._calcGroupCog();
  }
  groupCalcPower(flow) {
    if (!this.groupPredictFlow || !this.groupPredictPower || !this.groupPredictCtrl) return this.inputFlowCalcPower(flow);
    this.groupPredictCtrl.currentX = flow;
    const cCtrl = this.groupPredictCtrl.y(flow);
    this.groupPredictPower.currentX = cCtrl;
    return this.groupPredictPower.y(cCtrl);
  }
  _calcGroupCog() {
    if (!this.groupPredictFlow || !this.groupPredictPower) return 0;
    const powerCurve = this.groupPredictPower.currentFxyCurve[this.groupPredictPower.currentF];
    const flowCurve  = this.groupPredictFlow.currentFxyCurve[this.groupPredictFlow.currentF];
    if (!powerCurve?.y?.length || !flowCurve?.y?.length) return 0;
    const dP = this.groupPredictFlow.currentF;
    const { peakIndex } = this.calcEfficiencyCurve(powerCurve, flowCurve, dP);
    const yMin = this.groupPredictFlow.currentFxyYMin;
    const yMax = this.groupPredictFlow.currentFxyYMax;
    if (yMax <= yMin) return 0;
    return (flowCurve.y[peakIndex] - yMin) / (yMax - yMin);
  }
  reverseCurve(c) { return reverseCurve(c); }

  // ── efficiency math (delegates) ────────────────────────────────────
  calcCog()                            { return eff.calcCog(this); }
  calcEfficiencyCurve(p, f, dP)        { return eff.calcEfficiencyCurve(p, f, dP); }
  calcEfficiency(power, flow, variant) { return eff.calcEfficiency(this, power, flow, variant); }
  calcDistanceBEP(e, max, min)         { return eff.calcDistanceBEP(this, e, max, min); }
  calcDistanceFromPeak(e, peak)        { return eff.calcDistanceFromPeak(e, peak); }
  calcRelativeDistanceFromPeak(e, max, min) { return eff.calcRelativeDistanceFromPeak(this, e, max, min); }
  getCurrentCurves()                   { return eff.getCurrentCurves(this); }
  getCompleteCurve()                   { return eff.getCompleteCurve(this); }

  updateCurve(newCurve) {
    this.logger.info('Updating machine curve');
    const normalized = normalizeMachineCurve(newCurve, this.unitPolicy, this.logger);
    this.config = this.configUtils.updateConfig(this.config, {
      asset: { machineCurve: normalized, curveUnits: this.unitPolicy.curve },
    });
    if (!this.predictFlow || !this.predictPower || !this.predictCtrl) {
      const built = buildPredictors(this.config.asset.machineCurve);
      this.predictors = built;
      this.predictFlow = built.predictFlow; this.predictPower = built.predictPower; this.predictCtrl = built.predictCtrl;
      this.hasCurve = true;
    } else {
      this.predictFlow.updateCurve(this.config.asset.machineCurve.nq);
      this.predictPower.updateCurve(this.config.asset.machineCurve.np);
      this.predictCtrl.updateCurve(reverseCurve(this.config.asset.machineCurve.nq));
    }
  }

  showCoG()           { return display.showCoG(this); }
  showWorkingCurves() { return display.showWorkingCurves(this); }

  // ── output + status ─────────────────────────────────────────────────
  getOutput()      { return io.buildOutput(this); }
  getStatusBadge() { return io.buildStatusBadge(this); }

  close() {
    this._stateUnbind?.();
    detachAllListeners(this);
    if (this.state?.emitter) this.state.emitter.removeAllListeners();
    super.close?.();
  }
}

module.exports = Machine;