import { sameValue, untag } from '../../../model/Properties';
import type { NodeDef } from '../../NodeRegistry';
import { asList, asValueItem, isEntity } from '../../values';
import { any, list, num } from '../shared';

export const IndexOf: NodeDef = {
  type: 'IndexOf',
  label: 'Index of',
  category: 'data',
  description: 'Where a value sits in a list, or -1 if it is not in there – how "is this row full" is asked.',
  inputs: [list('list'), any('value')],
  outputs: [num('index')],
  params: [],
  // Compared by content, not by identity: two equal structs are never the same object. A color item
  // is compared as its number, or searching a list of colors with one would never find it.
  run: (_ctx, inputs) => {
    const wanted = asValueItem(inputs.value);
    // Two objects are the same one or they are not – there is no content to compare (#157).
    if (isEntity(wanted))
      return { outputs: { index: asList(inputs.list).findIndex((item) => item === wanted) } };
    const value = untag(wanted);
    return {
      outputs: {
        index: asList(inputs.list).findIndex((item) => !isEntity(item) && sameValue(untag(item), value)),
      },
    };
  },
};