'use strict';

const { BaseNodeAdapter, convert } = require('generalFunctions');
const Machine = require('./specificClass');
const commands = require('./commands');

// Event-driven: state + measurement events drive recomputes via the
// domain emitter. No tick loop. Status badge polled every second.
class nodeClass extends BaseNodeAdapter {
  static DomainClass = Machine;
  static commands = commands;
  static tickInterval = null;
  static statusInterval = 1000;

  buildDomainConfig(uiConfig) {
    const flowUnit = _resolveUnit(uiConfig.unit, 'volumeFlowRate', 'm3/h');
    // Stash extras on the Machine class so its constructor (called by
    // BaseNodeAdapter via DomainClass) picks them up alongside the
    // machineConfig. Single-threaded JS makes the hand-off race-free.
    Machine._pendingExtras = {
      stateConfig: {
        general: { logging: { enabled: uiConfig.enableLog, logLevel: uiConfig.logLevel } },
        movement: { speed: Number(uiConfig.speed), mode: uiConfig.movementMode },
        time: {
          starting: Number(uiConfig.startup), warmingup: Number(uiConfig.warmup),
          stopping: Number(uiConfig.shutdown), coolingdown: Number(uiConfig.cooldown),
        },
      },
      errorMetricsConfig: {},
    };
    return {
      asset: {
        uuid: uiConfig.assetUuid || uiConfig.uuid || null,
        tagCode: uiConfig.assetTagCode || uiConfig.assetTagNumber || null,
        tagNumber: uiConfig.assetTagNumber || null,
        unit: flowUnit,
        curveUnits: {
          pressure: _resolveUnit(uiConfig.curvePressureUnit, 'pressure', 'mbar'),
          flow:     _resolveUnit(uiConfig.curveFlowUnit || flowUnit, 'volumeFlowRate', flowUnit),
          power:    _resolveUnit(uiConfig.curvePowerUnit, 'power', 'kW'),
          control:  (typeof uiConfig.curveControlUnit === 'string' && uiConfig.curveControlUnit.trim()) || '%',
        },
      },
      general: { unit: flowUnit },
      flowNumber: uiConfig.flowNumber,
    };
  }
}

function _resolveUnit(candidate, expectedMeasure, fallback) {
  const raw = typeof candidate === 'string' ? candidate.trim() : '';
  const fb = String(fallback || '').trim();
  if (!raw) return fb;
  try {
    const desc = convert().describe(raw);
    if (expectedMeasure && desc.measure !== expectedMeasure) return fb;
    return raw;
  } catch (_) { return fb; }
}

module.exports = nodeClass;