import forIn from "./forIn"
import isObject from "./isObject"

/**
 * Applies a mapping function you provide over every value in a given Object (recursively).
 *
 * @function
 * @name mapObjectRecursive
 * @param {function} fn A mapping function that is invoked on every value in the provided Object
 * @param {object} obj An Object whose values will be mapped over (recursively)
 * @returns {object} A new Object that is the result of the mapping operation over all the values in the original Object
 */
function mapObjectRecursive(fn, obj) {
  const newObj = {}
  forIn((key, val, ob) => {
    /* Looks redundant, but is written this way for speed */
    if (
      typeof val === "object"
      && val != null
      && ((val.constructor && val.constructor.name === "Object") || isObject(val))
    ) {
      newObj[key] = mapObjectRecursive(fn, val)
    } else {
      newObj[key] = fn(val, key, ob)
    }
  }, obj)
  return newObj
}

export default mapObjectRecursive