/**
 * calculateAngles module
 *
 * Browser + Server + Jest (CJS) kompatibel
 */

function calculate(foundMarkers, jsonRobot) {
  // --- X of the Hand-Joint ---
  const validOns = new Set(['Base', 'Arm1', 'Joint1']);
  const foundById = new Map(foundMarkers.map(f => [f.id, f]));

  const markersMovingFixedX = jsonRobot.Marker.filter(m => validOns.has(m.on));
  const markersXPosition = new Map();

  const xs = markersMovingFixedX
    .map(m => {
      const f = foundById.get(m.id);
      return f ? f.position[0] - m.relPos[0] : null;
    })
    .filter(x => x !== null);

  const xAvg = xs.length
    ? xs.reduce((a, b) => a + b, 0) / xs.length
    : 0;

  return {
    meta: {
      module: 'calculateAngles',
      timestamp: new Date().toISOString()
    },
    inputs: {
      markers: foundMarkers ?? null,
      robot: jsonRobot ?? null
    },
    status: 'ok',
    result: {
      xAvg
    }
  };
}


module.exports = { calculate };