import type { NodeDef } from '../../NodeRegistry';
import { currentState } from '../../sharedState';
import { machinePort } from '../../stateMachine';
import { asString } from '../../values';
import { str } from '../shared';

/**
 * The data side of `State branch`: two outputs, because the two uses pull apart. `name` is what
 * `Join` and a `Text` want to show, `id` is what a comparison should hold – a rename moves the
 * name, never the id. Both are empty while the machine is in no state.
 */
export const CurrentState: NodeDef = {
  type: 'CurrentState',
  label: 'Current state',
  category: 'data',
  description: 'The state the machine is in: its name to show, its id to compare. Empty for no state.',
  inputs: [machinePort()],
  outputs: [str('name'), str('id')],
  params: [],
  read: (ctx, _params, input, _def, lookup) => {
    const machine = asString(input('machine'));
    const id = currentState(ctx, machine);
    const name = (id && lookup.machine(machine)?.states.find((s) => s.id === id)?.name) || '';
    return { name, id };
  },
};