import { worldPositionOf } from '../../NodeContext';
import type { NodeDef } from '../../NodeRegistry';
import { asEntity } from '../../values';
import { num, obj } from '../shared';

export const Distance: NodeDef = {
  type: 'Distance',
  label: 'Distance',
  category: 'data',
  description: 'Distance between two objects, in world units – however deep each one is nested.',
  inputs: [obj('a'), obj('b')],
  outputs: [num('result')],
  params: [],
  run: (_ctx, inputs) => {
    const a = asEntity(inputs.a);
    const b = asEntity(inputs.b);
    if (!a || !b) return { outputs: { result: 0 } };
    const pa = worldPositionOf(a);
    const pb = worldPositionOf(b);
    return { outputs: { result: Math.hypot(pa.x - pb.x, pa.y - pb.y) } };
  },
};