node-red-contrib-powersaver-adapter/powersaver-adapter.js

A Node-RED adapter that converts 15-minute (quarterly) electricity price data into hourly values for use with PowerSaver.no nodes.

module.exports = function (RED) {
  function quartersToHours(array) {
    if (!Array.isArray(array)) return [];

    let hours = [];
    for (let i = 0; i < array.length; i += 4) {
      let group = array.slice(i, i + 4);
      let avg =
        group.reduce((sum, obj) => sum + Number(obj.value), 0) / group.length;
      hours.push({ value: avg, start: group[0].start });
    }
    return hours;
  }

  function PowerSaverAdapterNode(config) {
    RED.nodes.createNode(this, config);
    const node = this;

    node.on("input", function (msg, send, done) {
      try {
        const data = msg?.payload?.priceData;
        if (!Array.isArray(data)) {
          node.warn("msg.payload.priceData is not an array");
          send ? send(msg) : node.send(msg);
          if (done) done();
          return;
        }

        msg.payload.priceData = quartersToHours(data);

        send ? send(msg) : node.send(msg);
        if (done) done();
      } catch (err) {
        node.error(err.message, msg);
        if (done) done(err);
      }
    });
  }

  RED.nodes.registerType("powersaver-adapter", PowerSaverAdapterNode);
};