import { isEqual } from 'lodash';

type CommonTypes = number | boolean | string;

type Obj<T> = T[] | { [key: string | number]: T } | T;

// eslint-disable-next-line import/prefer-default-export
export function reduxSet<T>(
  obj: Obj<T>,
  path: (string | number)[],
  val: CommonTypes
): Obj<T> | CommonTypes {
  const [prop, ...restPath] = path;
  if (typeof prop === 'undefined') {
    if (!isEqual(obj, val)) return val;
    return obj;
  }
  let before;
  if (prop in obj) {
    before = (obj as { [key: string | number]: T })[prop];
  } else {
    before = {};
  }
  const after = reduxSet(before, restPath, val);
  if (after !== before) {
    let result;
    if (Array.isArray(obj)) {
      result = [
        ...obj.slice(0, prop as number),
        after,
        ...obj.slice((prop as number) + 1, obj.length),
      ] as T[];
    } else {
      result = {
        ...obj,
        [prop]: after,
      } as { [key: string | number]: T };
    }
    return result;
  }
  return obj;
}