import { of, curry } from 'ramda';

import flattenPath from './flattenPath';

/**
 * Flattens a property so that its fields are spread out into the provided object.
 * It's like {@link RA.spreadProp|spreadProp}, but preserves object under the property path.
 *
 * @func flattenProp
 * @memberOf RA
 * @since {@link https://char0n.github.io/ramda-adjunct/1.19.0|v1.19.0}
 * @category Object
 * @typedef Idx = String | Int
 * @sig [Idx] -> {k: v} -> {k: v}
 * @param {!string|number} prop The property to flatten
 * @param {!Object} obj The provided object
 * @return {!Object} The flattened object
 * @see {@link RA.flattenPath|flattenPath}, {@link RA.spreadProp|spreadProp}
 * @example
 *
 * RA.flattenProp(
 *   'b',
 *   { a: 1, b: { c: 3, d: 4 } }
 * ); // => { a: 1, c: 3, d: 4, b: { c: 3, d: 4 } };
 */
const flattenProp = curry((prop, obj) => flattenPath(of(Array, prop), obj));

export default flattenProp;