"use strict";

const ENV_DEBUG = require("../../env/debug");

const isArray = require("../../is/array");

const curry = require("../../fp/curry");

const identity = require("../../fp/identity");

const emptyTarget = require("../../dopemerge/emptyTarget");

const defaultTo = require("../../cast/defaultTo");

const objOrArrayKeys = require("../../util/keysObjOrArray");

const size = require("../../util/size"); // const always = require('../../fp/always')
// pipe(nthArg(2), always)


const defaultKeyTransformer = (value, key) => key;

const defaultValTransformer = identity;
/**
 * @desc maps keys and vals
 *       probably needs a `mapArrayKeyVal` & `mapObjKeyVal`
 *       maybe `mapMap` haha
 *
 * @TODO this is huge perf killer just super easy util
 *
 * https://github.com/jashkenas/underscore/blob/master/underscore.js#L1021 underscore-map-obj
 * @alias mapAny
 * @memberOf loop
 * @since 5.0.0-beta.6
 */

function mapObjOrArray(obj, onValue, onKey, init) {
  const result = defaultTo(emptyTarget(obj), init);
  const valTransformer = defaultTo(defaultValTransformer, onValue);
  const keyTransformer = defaultTo(defaultKeyTransformer, onKey);
  const isArrayObj = isArray(obj);
  const keys = objOrArrayKeys(obj);

  if (ENV_DEBUG) {
    console.log('loop_mapObjOrArray', {
      keys,
      result,
      isArrayObj,
      obj,
      init
    });
  }

  for (let index = 0; index < keys.length; index++) {
    const key = isArrayObj ? index : keys[index];
    const value = obj[key];

    if (ENV_DEBUG) {
      console.log('loop_mapObjOrArray', {
        key,
        value,
        obj,
        index
      });
    }

    result[keyTransformer(value, key, obj)] = valTransformer(value, key, obj);
  }

  return result;
}

module.exports = curry(2, mapObjOrArray);