pumpingStation/src/nodeClass.js

const { outputUtils, configManager } = require('generalFunctions');
const Specific = require("./specificClass");

class nodeClass {
  /**
   * Create a node.
   * @param {object} uiConfig - Node-RED node configuration.
   * @param {object} RED    - Node-RED runtime API.
   * @param {object} nodeInstance - The Node-RED node instance.
   * @param {string} nameOfNode - The name of the node, used for
   */
  constructor(uiConfig, RED, nodeInstance, nameOfNode) {

    // Preserve RED reference for HTTP endpoints if needed
    this.node = nodeInstance;
    this.RED = RED;
    this.name = nameOfNode;

    // Load default & UI config
    this._loadConfig(uiConfig,this.node);

    // Instantiate core class
    this._setupSpecificClass();

    // Wire up event and lifecycle handlers
    this._bindEvents();
    this._registerChild();
    this._startTickLoop();
    this._attachInputHandler();
    this._attachCloseHandler();
  }

  /**
   * Load and merge default config with user-defined settings.
   * @param {object} uiConfig - Raw config from Node-RED UI.
   */
  _loadConfig(uiConfig,node) {
    const cfgMgr = new configManager();
    this.defaultConfig = cfgMgr.getConfig(this.name);

    // Build config: base sections + pumpingStation-specific domain config
    this.config = cfgMgr.buildConfig(this.name, uiConfig, node.id, {
      basin: {
        volume: uiConfig.basinVolume,
        height: uiConfig.basinHeight,
        inflowLevel: uiConfig.inflowLevel,
        outflowLevel: uiConfig.outflowLevel,
        overflowLevel: uiConfig.overflowLevel,
      },
      hydraulics: {
        refHeight: uiConfig.refHeight,
        minHeightBasedOn: uiConfig.minHeightBasedOn,
        basinBottomRef: uiConfig.basinBottomRef,
      },
      control:{
        mode: uiConfig.controlMode,
        levelbased:{
          minLevel:uiConfig.minLevel,
          startLevel:uiConfig.startLevel,
          maxLevel:uiConfig.maxLevel
        }
      },
      safety:{
        enableDryRunProtection: uiConfig.enableDryRunProtection,
        dryRunThresholdPercent: uiConfig.dryRunThresholdPercent,
        enableOverfillProtection: uiConfig.enableOverfillProtection,
        overfillThresholdPercent: uiConfig.overfillThresholdPercent,
        timeleftToFullOrEmptyThresholdSeconds: uiConfig.timeleftToFullOrEmptyThresholdSeconds
      }
    });

    // Utility for formatting outputs
    this._output = new outputUtils();
  }

  /**
   * Instantiate the core logic and store as source.
   */
  _setupSpecificClass() {
    this.source = new Specific(this.config);
    this.node.source = this.source; // Store the source in the node instance for easy access
  }

  /**
   * Bind Node-RED status updates.
   */
  _bindEvents() {
    
  }

  // init registration msg
  _registerChild() {
    setTimeout(() => {
      this.node.send([
        null,
        null,
        { topic: 'registerChild', payload: this.node.id , positionVsParent: this.config?.functionality?.positionVsParent || 'atEquipment' , distance: this.config?.functionality?.distance || null},
      ]);
    }, 100);
  }

  _updateNodeStatus() {
    const ps = this.source;

    const pickVariant = (type, prefer = ['measured', 'predicted'], position = 'atEquipment', unit) => {
      for (const variant of prefer) {
        const chain = ps.measurements.type(type).variant(variant).position(position);
        const value = unit ? chain.getCurrentValue(unit) : chain.getCurrentValue();
        if (value != null) return { value, variant };
      }
      return { value: null, variant: null };
    };

    const vol = pickVariant('volume', ['measured', 'predicted'], 'atEquipment', 'm3');
    const volPercent = pickVariant('volumePercent', ['measured','predicted'], 'atEquipment'); // already unitless
    const level = pickVariant('level', ['measured', 'predicted'], 'atEquipment', 'm');
    const netFlow = pickVariant('netFlowRate', ['measured', 'predicted'], 'atEquipment', 'm3/h');

    const maxVolBeforeOverflow = ps.basin?.maxVolAtOverflow ?? ps.basin?.maxVol ?? 0;
    const currentVolume = vol.value ?? 0;
    const currentvolPercent = volPercent.value ?? 0;
    const netFlowM3h = netFlow.value ?? 0;

    const direction = ps.state?.direction ?? 'unknown';
    const secondsRemaining = ps.state?.seconds ?? null;
    const timeRemainingMinutes = secondsRemaining != null ? Math.round(secondsRemaining / 60) : null;

    const badgePieces = [];
    badgePieces.push(`${currentvolPercent.toFixed(1)}% `);
    badgePieces.push(
      `V=${currentVolume.toFixed(2)} / ${maxVolBeforeOverflow.toFixed(2)} m³`
    );
    badgePieces.push(`net: ${netFlowM3h.toFixed(0)} m³/h`);
    if (timeRemainingMinutes != null) {
      badgePieces.push(`t≈${timeRemainingMinutes} min)`);
    }

    const { symbol, fill } = (() => {
      switch (direction) {
        case 'filling': return { symbol: '⬆️', fill: 'blue' };
        case 'draining': return { symbol: '⬇️', fill: 'orange' };
        case 'steady': return { symbol: '⏸️', fill: 'green' };
        default: return { symbol: '❔', fill: 'grey' };
      }
    })();

    badgePieces[0] = `${symbol} ${badgePieces[0]}`;

    return {
      fill,
      shape: 'dot',
      text: badgePieces.join(' | ')
    };
  }



  // any time based functions here
  _startTickLoop() {
    setTimeout(() => {
      this._tickInterval = setInterval(() => this._tick(), 1000);

      // Update node status on nodered screen every second ( this is not the best way to do this, but it works for now)
      this._statusInterval = setInterval(() => {
        const status = this._updateNodeStatus();
        this.node.status(status);
      }, 1000);

    }, 1000);
  }

  /**
   * Execute a single tick: update measurement, format and send outputs.
   */
  _tick() {
    
    //pumping station needs time based ticks to recalc level when predicted
    this.source.tick();
    const raw = this.source.getOutput();
    const processMsg = this._output.formatMsg(raw, this.source.config, 'process');
    const influxMsg  = this._output.formatMsg(raw, this.source.config, 'influxdb');

    // Send only updated outputs on ports 0 & 1
    this.node.send([processMsg, influxMsg]);
  }

  /**
   * Attach the node's input handler, routing control messages to the class.
   */
  _attachInputHandler() {
    this.node.on('input', (msg, send, done) => {
      switch (msg.topic) {
        //example
        case 'changemode':
          this.source.changeMode(msg.payload);
          break;
        case 'registerChild': {
          // Register this node as a child of the parent node
          const childId = msg.payload;
          const childObj = this.RED.nodes.getNode(childId);
          this.source.childRegistrationUtils.registerChild(childObj.source, msg.positionVsParent);
          break;
        }
        case 'calibratePredictedVolume': {
          const injectedVol = parseFloat(msg.payload);
          this.source.calibratePredictedVolume(injectedVol);
          break;
        }
        case 'calibratePredictedLevel': {
          const injectedLevel = parseFloat(msg.payload);
          this.source.calibratePredictedLevel(injectedLevel);
          break;
        }
        case 'q_in': {
          // payload can be number or { value, unit, timestamp }
          const val = Number(msg.payload);
          const unit = msg?.unit;
          const ts = msg?.timestamp || Date.now();
          this.source.setManualInflow(val, ts, unit);
          break;
        }
        case 'Qd': {
          // Manual demand: operator sets the target output via a
          // dashboard slider. Only accepted when PS is in 'manual'
          // mode — mirrors how rotatingMachine gates commands by
          // mode (virtualControl vs auto).
          const demand = Number(msg.payload);
          if (!Number.isFinite(demand)) {
            this.source.logger.warn(`Invalid Qd value: ${msg.payload}`);
            break;
          }
          if (this.source.mode === 'manual') {
            this.source.forwardDemandToChildren(demand).catch((err) =>
              this.source.logger.error(`Failed to forward demand: ${err.message}`)
            );
          } else {
            this.source.logger.debug(
              `Qd ignored in ${this.source.mode} mode. Switch to manual to use the demand slider.`
            );
          }
          break;
        }
      }
      done();
    });
  }

  /**
   * Clean up timers and intervals when Node-RED stops the node.
   */
  _attachCloseHandler() {
    this.node.on('close', (done) => {
      clearInterval(this._tickInterval);
      clearInterval(this._statusInterval);
      this.node.status({});  // clear node status badge
      done();
    });
  }
}

module.exports = nodeClass;